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Color ink jet printer

EPSON Stylus Color 900 (Revision C)

®
SEIJ98006

Notice:









All rights reserved. No part of this manual may be reproduced, stored in a retrieval system, or transmitted in any form or by any means,
electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SEIKO EPSON CORPORATION.
The contents of this manual are subject to change without notice.
All effort have been made to ensure the accuracy of the contents of this manual. However, should any errors be detected, SEIKO EPSON
would greatly appreciate being informed of them.
The above not withstanding SEIKO EPSON CORPORATION can assume no responsibility for any errors in this manual or the consequences
thereof.

EPSON is a registered trademark of SEIKO EPSON CORPORATION.

General Notice:

Other product names used herein are for identification purpose only and may be trademarks or registered trademarks of their
respective owners. EPSON disclaims any and all rights in those marks.

Copyright © 1996 SEIKO EPSON CORPORATION. Printed in Japan.

PRECAUTIONS
Precautionary notations throughout the text are categorized relative to 1)Personal injury and 2) damage to equipment.

DANGER

Signals a precaution which, if ignored, could result in serious or fatal personal injury. Great caution should be exercised in
performing procedures preceded by DANGER Headings.

WARNING

Signals a precaution which, if ignored, could result in damage to equipment.

The precautionary measures itemized below should always be observed when performing repair/maintenance procedures.

DANGER
1. ALWAYS DISCONNECT THE PRODUCT FROM THE POWER SOURCE AND PERIPHERAL DEVICES PERFORMING ANY MAINTENANCE
OR REPAIR PROCEDURES.
2. NOWORK SHOULD BE PERFORMED ON THE UNIT BY PERSONS UNFAMILIAR WITH BASIC SAFETY MEASURES AS DICTATED FOR
ALL ELECTRONICS TECHNICIANS IN THEIR LINE OF WORK.
3. WHEN PERFORMING TESTING AS DICTATED WITHIN THIS MANUAL, DO NOT CONNECT THE UNIT TO A POWER SOURCE UNTIL
INSTRUCTED TO DO SO. WHEN THE POWER SUPPLY CABLE MUST BE CONNECTED, USE EXTREME CAUTION IN WORKING ON
POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS.

WARNING
1. REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON CERTIFIED REPAIR TECHNICIAN.
2. MAKE CERTAIN THAT THE SOURCE VOLTAGES IS THE SAME AS THE RATED VOLTAGE, LISTED ON THE SERIAL NUMBER/RATING
PLATE. IF THE EPSON PRODUCT HAS A PRIMARY AC RATING DIFFERENT FROM AVAILABLE POWER SOURCE, DO NOT CONNECT IT
TO THE POWER SOURCE.
3. ALWAYS VERIFY THAT THE EPSON PRODUCT HAS BEEN DISCONNECTED FROM THE POWER SOURCE BEFORE REMOVING OR
REPLACING PRINTED CIRCUIT BOARDS AND/OR INDIVIDUAL CHIPS.
4. IN ORDER TO PROTECT SENSITIVE MICROPROCESSORS AND CIRCUITRY, USE STATIC DISCHARGE EQUIPMENT, SUCH AS ANTISTATIC WRIST STRAPS, WHEN ACCESSING INTERNAL COMPONENTS.
5. REPLACE MALFUNCTIONING COMPONENTS ONLY WITH THOSE COMPONENTS BY THE MANUFACTURE; INTRODUCTION OF
SECOND-SOURCE ICs OR OTHER NONAPPROVED COMPONENTS MAY DAMAGE THE PRODUCT AND VOID ANY APPLICABLE EPSON
WARRANTY.

PREFACE
This manual describes basic functions, theory of electrical and mechanical operations, maintenance and repair procedures of Stylus Color 900. The
instructions and procedures included herein are intended for the experienced repair technicians, and attention should be given to the precautions on
the preceding page. The chapters are organized as follows:

CHAPTER 1.

PRODUCT DESCRIPTIONS

Provides a general overview and specifications of the product.

CHAPTER 2.

OPERATING PRINCIPLES

Describes the theory of electrical and mechanical operations of the product.

CHAPTER 3.

TROUBLESHOOTING

Provides the step-by-step procedures for troubleshooting.

CHAPTER 4.

DISASSEMBLY AND ASSEMBLY

Describes the step-by-step procedures for disassembling and assembling the
product.

CHAPTER 5.

ADJUSTMENTS

Provides Epson-approved methods for adjustment.

CHAPTER 6.

MAINTENANCE

Provides preventive maintenance procedures and the lists of Epson-approved
lubricants and adhesives required for servicing the product.

APPENDIX
Provides the following additional information for reference:
• Connector pin assignments
• Electric circuit boards components layout
• Exploded diagram
• Electrical circuit boards schematics

Revision Status
Revision

Issued Date

Description

A

January 06, 1999

First Release

February 15, 1999

The following items have been revised:

• Page 105/Table 4-1:
Some contents have been changed.
• Figure 4-4, Figure 4-17:
Contents of the figures have been corrected.
• Figure 4-13, 4-15, 4-16, 4-24, 4-25, 4-39, 4-40, 4-41:
Figure titles have been corrected.
• Figure 4-14:
Figure title and the contents of the figure have been corrected.

Pages from 140 through 145:
Head Angular Adjustment procedure has been changed due to overall
review of the section.

March 4, 1999

The whole book is revised. The actual change is made on the following
points:
• Chapter 4 / Page 115 / Figure 4-18 and step 3
• Chapter 5 / Page 135 to 141and Page 148.
The rest of the pages in this chapter only changed in page numbers.
• Chapter 6 and 7 changed in page numbers only.

B

C

Contents
Product Description
Features ...................................................................................................... 10
Specifications ............................................................................................ 11
Printing Specifications ............................................................................ 11
Options and Consumable Products ........................................................ 14
Paper Specifications ............................................................................... 15
Cut Sheet ........................................................................................... 15
Transparency, Glossy Paper .............................................................. 15
Envelope ............................................................................................ 15
Index Card .......................................................................................... 15
Self Adhesive Sheets ......................................................................... 15
Photo Paper ....................................................................................... 16
Photo Stickers .................................................................................... 16
Printable Area ......................................................................................... 17
Ink Cartridge Specifications .................................................................... 19
Black Ink Cartridge ............................................................................. 19
Color Ink Cartridge ............................................................................. 20
Electrical Specifications .......................................................................... 21
Environmental Condition ........................................................................ 21
Reliability ................................................................................................ 22
Safety Approvals .................................................................................... 22
Acoustic Noise ........................................................................................ 22
CE Marking (220 ~ 240 V version) ......................................................... 22
Physical Specifications ........................................................................... 22
Interface ...................................................................................................... 23
Parallel Interface (Forward Channel) ..................................................... 23
Parallel Interface (Reverse Channel) ..................................................... 26
Mac Serial Interface ............................................................................... 28
USB Interface ......................................................................................... 29
Printer Language and Emulation ............................................................ 29
Prevention Hosts from Data Transfer time-out ....................................... 29
Auto Interface Selection ......................................................................... 29

IEEE 1284.4 Protocol ......................................................................... 30
Control Panel Operation ...........................................................................
Indicators (LEDs) ...................................................................................
Panel Functions .....................................................................................
Printer Setting Mode ...........................................................................
Special Setting Mode .........................................................................
Printer Condition and Panel Status ........................................................

31
31
32
32
34
35

Error Status ................................................................................................
Ink Out ....................................................................................................
Paper Out ...............................................................................................
Paper Jam ..............................................................................................
No Ink Cartridge .....................................................................................
Maintenance Request ............................................................................
Fatal Errors ............................................................................................

36
36
36
36
36
36
36

Printer Initialization ................................................................................... 37
Component Layout ....................................................................................
Printer Mechanism .................................................................................
C265 Main Board ...................................................................................
C265 PSB/PSE Board ............................................................................
C265 PNL Board ....................................................................................
C265 Relay Board ..................................................................................

38
38
39
41
42
42

Operating Principles
Overview .................................................................................................... 44
Printer Mechanism Operating Principles ................................................
Carriage Mechanism ..............................................................................
Printing Mechanism ................................................................................
Paper Load Mechanism .........................................................................
Paper Feed Mechanism .........................................................................
Pump/ASF Switch Mechanism ...............................................................
Pump / Carriage Lock / Head Cleaner Mechanism ................................

44
46
48
49
51
52
54

Electrical Circuit Operation Principles .................................................... 56
C265 PSB/PSE Power Supply Board ..................................................... 56
C265Main Board .................................................................................... 59
CR Motor Driver Circuit .......................................................................... 67
PF Motor Driver Circuit ........................................................................... 69
Pump/ASF Motor Driver Circuit .............................................................. 71
Printhead Driver Circuit .......................................................................... 72
Cooling Fan Driver Circuit ...................................................................... 74
ASF Solenoid Driver Circuit .................................................................... 76
EEPROM Control Driver Circuit ............................................................. 77

ASF Sensor Removal .......................................................................
CRHP Sensor Removal ....................................................................
PE Sensor Removal .........................................................................
Encoder Belt Sensor Removal .........................................................
Carriage Unit Removal .....................................................................
Pump Unit Removal .........................................................................
Paper Eject Frame Removal ............................................................
Paper Eject Roller Removal .............................................................
Platen Removal ................................................................................
PF Roller Removal ...........................................................................

121
122
122
123
124
125
126
126
127
128

Troubleshooting

Adjustment

Overview ..................................................................................................... 79
Troubleshooting with LED Error Indications ........................................... 80
Remedies for Paper Out Error ............................................................ 81
Remedies for the Paper Jam Error ..................................................... 83
Remedies for No I/C and Ink Out Errors ............................................. 85
Remedies for the Maintenance Error ................................................. 87
Remedies for Fatal Error .................................................................... 88
Isolating the Faulty Part on the Power Supply Board ............................. 90
Isolating the Faulty Part according to the Phenomenon ......................... 92

Overview .................................................................................................. 131
Conditions for Each Adjustment ........................................................... 131

Disassembly and Assembly
Overview ................................................................................................... 102
Precautions for Disassembling the Printer ........................................... 102
Disassembly Procedures ........................................................................ 104
Upper Case and Control Panel Removal ............................................. 106
Printer Mechanism Removal ................................................................ 107
C265 Main Board Unit Removal ........................................................... 108
Relay Board and Cooling Fan Removal ............................................... 109
Shield Plate on the C265 Main Board Removal ................................... 110
C265 PSB/PSE Board Removal ........................................................... 111
Printer Mechanism Disassembly .......................................................... 112
Printhead Removal ........................................................................... 112
CR Motor Removal ........................................................................... 114
PF Motor Removal ........................................................................... 115
Pump/ASF Motor and Solenoid Removal ......................................... 116
ASF Unit Removal ............................................................................ 116

Adjustments .............................................................................................
Preliminary Operation ..........................................................................
Market Destination Check ....................................................................
Head Actuator Voltage Input ................................................................
Head Angular Adjustment ....................................................................
Bi-Directional Adjustment .....................................................................
Printhead Cleaning Using the Program ................................................
Initial Ink Charge ..................................................................................
Indication of the Counter Value for the Waste Ink Pad ........................
Fan Check ............................................................................................
Paper Gap Adjustment .........................................................................

134
134
136
137
141
148
153
154
155
157
158

Maintenance
Overview ..................................................................................................
Maintenance .........................................................................................
Cleaning the Printhead .....................................................................
Maintenance Request Error .............................................................

162
162
163
164

Lubrication and Adhesion ...................................................................... 165
Lubricating the Carriage Guide Shaft ................................................... 166

Appendix
Connector Summary ............................................................................... 172
EEPROM ADDRESS MAP ....................................................................... 176

Component Layout .................................................................................. 180
Parts List .................................................................................................. 184
Exploded Diagrams ................................................................................. 187
Circuit Diagrams ...................................................................................... 195






PRODUCT DESCRIPTION

EPSON Stylus Color 900

Revision C

1.1 FEATURES
The Stylus COLOR 900 is the latest in EPSON’s advanced lines of ink
jet printers and offering the following features.




High color print quality:
- 1440 (H) x720 (V) dpi printing
- Printing with 4 color inks (YMCK)
- Traditional and New Microweave
- Imprevement in color rendering using variable dot




Built-in auto sheet feeder:
- Holds 100 cut-sheets (64 g/m2)
- Holds 10 envelopes
- Holds 30 transparency fIlms




Built-in 3 I/F and 1 optional I/F card slot
- Mac serial I/F (up to approximately 1.8 Mbps)
- Bi-directional parallel I/F (lEEE-1284 level 1 device)
- USB
- Optional Type-B level 2 I/F card slot








Figure 1-1. Stylus Color 900

4 scaleable fonts, 5 LQ fonts
13 character tables (Standard version)
37 character tables (NLSP version)

Product Description

Features

10

EPSON Stylus Color 900

Revision C






1.2 Specifications

Print direction:

Print speed and Printable columns

1.2.1 Printing Specifications






Print method:

Bi-direction with logic seeking

Table 1-1.
Print Speed and Printable Columns for Character Mode

On demand ink jet

Character pitch

Nozzle configuration: Monochrome=192 nozzles (96 x 2 staggered)
Color=96 nozzles x 3 (Cyan, Magenta,
Yellow)
(See Figure 1-2 for the nozzle configuration.)

# 9 6
# 9 5
# 9 4
# 9 3

# 9 6

3 6 0 d p i

# 9 5

1 8 0 d p i

# 9 4
# 9 3

# 3
# 2
# 1

# 3
# 2
# 1
R o w A ( B la c k 1 )
R o w B ( B la c k 2 )

# 9 6

# 9 6

# 9 5

# 9 5

# 9 4

# 9 4

# 9 3

# 9 3

# 3

# 3

# 2

# 2

# 1

# 1

R o w C (M a g e n ta )
R o w E ( Y e llo w )
R o w D (C y a n )

Printable columns

LQ speed

10 CPI (Pica)

80

285 CPS

12 CPI (Elite)

96

342 CPS

15 CPI

120

428 CPS

17 CPI (Pica condensed)

137

487 CPS

20 CPI (EIite condensed)

160

570 CPS

Table 1-2.
Print Speed and Printable columns for Raster Graphics Mode




Horizontal
resolution

Printable area

Available dot

CRS

180 dpi

8.26 inch

1488

28.5 IPS

360 dpi

8.26 inch

2976

28.5 IPS

720 dpi

8.26 inch

5952

20 IPS

Control code:

ESC/P2 and expanded raster graphics code
EPSON Remote command
IBM X24E emulation

Figure 1-2. Nozzle configuration

Product Description

Specifications

11

EPSON Stylus Color 900




Character tables:

Revision C

Legal and 14 international character sets




Standard version: (13 character tables)
Italic table
PC 850 (Multilingual)
PC 861 (Icelandic)
PC 865(Nordic)
BRASCII
ISO Latin 1
ISO 8859-15

PC 860 (Portuguese)
PC 437(US, Standard Europe)
PC 863(Canadian-French)
Abicomp
Roman 8
PC 858

NLSP version: (36 character tables)
Italic table
PC850
PC855
PC861
PC869
ISO 8859-7
PC774
PC866 LAT
PC APTEC
Hebrew7*
Abicomp
ISO Latin 1

PC437
PC852
PC857
PC865
MAZOWIA
lSO Latin 1T
Estonia
PC866 UKR
PC708
Hebrew8*
BRASCII
PC 858

PC437 Greek
PC853
PC860
PC866
Code MJK
Bulgaria
ISO 8859-2
PC AR864
PC720
PC862*
Roman 8
lSO 8859-15

Bit map LQ font:
EPSON Roman
EPSON Sans Serif
EPSON Courier
EPSON Prestige
EPSON Script

10 CPI, 12 CPI, 15CPI, Proportional
10 CPI, 12 CPI, 15CPI, Proportional
10 CPI, 12 CPI, 15CPI
10 CPI, 12 CPI, 15CPI
10 CPI, 12 CPI, 15CPI

Scaleable font
EPSON Roman
EPSON Sans Serif
EPSON Roman T
EPSON Sans Serif H

10.5 pt., 8 pt., - 32 pt. (every 2 pt.)
10.5 pt., 8 pt., - 32 pt. (every 2 pt.)
10.5 pt., 8 pt., - 32 pt. (every 2 pt.)
10.5 pt., 8 pt., - 32 pt. (every 2 pt.)

* Each Typeface has 4 variations as the following example of
EPSON Roman.
EPSON Roman normal
EPSON Roman bold
EPSON Roman italic
EPSON Roman bold italic
See Table 1-3 which lists the character tables and available
typefaces.

* These character tables can not be selected in the Default setting
mode.












Product Description

Typeface

Feeding method:

Friction feed with ASF

Line spacing:

1/6 inch, 1/8 inch or programable at 1/360
inch

Paper path:

Cut-sheet

Feed speed:

192/360 inch feed =
Continuous feed =

Input data buffer:

256 KB

Specifications

ASF (Top entry, Front out)
116 ms
176.3 mm/second
(6.94 inch/second)

12

EPSON Stylus Color 900

Revision C

Table 1-3. Character Tables and Available Typefaces

NLSP version

Standard version

Character Tables

Bit map font

Italic table
PC 860 (Portuguese)
PC 861 (Icelandic)
PC 865 (Nordic)
Abicomp
lSO Latin1
ISO 8859-15

PC 437 (US Standard Europe)
PC 850 (Multilingual)
PC 863 (Canadian-French)
BRASCII
Roman 8
PC 858

Italic table
PC 850 (Multilingual)
PC 861 (Icelandic)
Abicomp
lSOLatin1
ISO 8859-15

PC 437(US Standard Europe)
PC 860(Portuguese)
PC 865(Nordic)BRASCIl
Roman8
PC 858

PC437Greek
PC 853 (Turkish)
PC 857 (Turkish)
PC 869 (Greek)
Code MJK (CSFR)
lSO Latin 1T (Turkish)
PC7 74
1SO 8859-2 (lSO Latin 2)
PC 866 UKR

PC 852 (East Europe)
PC 855 (Cyrillic)
PC 866 (Russian)
MAZOWIA (Poland)
lSO 8859-7 (Latin/Greek)
Bulgaria (Bulgarian)
Estonia
PC 866 LAT

PC APTEC (Arabic)
PC 720 (Arabic)

PC 708 (Arabic)
PC AR864 (Arabic)

Hebrew7*
Hebrew 8*
PC862 (Hebrew)*

EPSON Roman
EPSON Sans Serif
EPSON Courier
EPSON Prestige
EPSON Script

EPSON Roman
EPSON Sans Serif
EPSON Courier
EPSON Prestige
EPSON Script

Scaleable font

EPSON Roman
EPSON Sans Serif
EPSON Roman T
EPSON Sans Serif H

EPSON Roman
EPSON Sans Serif

EPSON Roman
EPSON Sans Serif

Not supported

EPSON Roman
EPSON Courier

Not supported

* Not mentioned in the User’s Guide. These character tables can not select in the default setting
mode.

Product Description

Specifications

13

EPSON Stylus Color 900

Revision C

1.2.2 Options and Consumable Products

Table 1-6. EPSON Special Media

NOTE: The asterisk (∗) is a substitute for the last digit of the product
number, which varies by country.
NOTE: The availability of special media varies by country.
Table 1-4. Options Available for Stylus Color 900
Items

Codes

Items

Codes

EPSON 360 dpi Ink Jet Paper (A4)

S041059 / S041025

EPSON 360 dpi Ink Jet Paper (Letter)

S041060 / S041028

EPSON Photo Quality Ink Jet Paper (A4)

S041061 / S041026

EPSON Photo Quality Ink Jet Paper (Letter)

S041062 / S041029

EPSON Photo Quality Ink Jet Paper (Legal)

S041067 / S041048

32KB Serial I/F card

C82307∗ / C82308∗

EPSON Photo Quality Ink Jet Card (A6)

S041054

32KB Parallel Interface Card

C80310∗

EPSON Photo Quality Ink Jet Card (5 x 8”)

S041121

Coax I/F card

C82314∗

EPSON Photo Quality Ink Jet Card (8 x 10”)

S041122

Twin-ax I/F card

C82315∗

EPSON Photo Quality Self Adhesive Sheet (A4)

S041106

LocalTalk Interface Card

C82312∗

EPSON Ink Jet Note Card (A6) (with envelopes)

S041147

C82362∗/ C82363∗ /
C82364∗

EPSON Ink Jet Greeting Cards (5 x 8”) (with envelops)

S041148

Type B Ethernet Interface Card
Type B Bi-directional Parallel Interface Card

C82345∗

EPSON Photo Quality Glossy Film (A4)

S041071

Parallel Interface Cable (shielded) from D-SUB 25-pin
(computer) to 36-pin Amphenol 57 Series (printer)

C83602∗

EPSON Photo Quality Glossy Film (Letter)

S041172

EPSON Photo Quality Glossy Film (A6)

S041107

Serial Interface Cable from D-SUB 25-pin (computer)
to D-SUB 25-pin (printer)

C83603∗

EPSON Ink Jet Transparencies (A4)

S041063

EPSON Ink Jet Transparencies (Letter)

S041064

EPSON Photo Paper (A4)

S041140

EPSON Photo Paper (Letter)

S041141

EPSON Photo Paper (4 x 6”)

S041134

EPSON Photo Paper Cards (A4)

S041177

EPSON Photo Stickers 16 (A6)

S041144

EPSON Photo Stickers 4 (A6)

S041176

EPSON Panoramic Photo Paper (210 x 594 mm)

S041145

Serial Interface Cable from D-SUB 9-pin (computer)
to D-SUB 25-pin (printer)

C83605∗

USB Interface Cable (shielded) from Series A 4-pin
(computer) to Series B 4-pin (printer) (This cable is
not supplied in all locations.)

C83623∗

/ C83604∗
/ C83606∗

Table 1-5. Ink Cartridge Available for Stylus Color 900

EPSON Ink Jet Greeting Cards (8 x 10”) (with envelops) S041149

Items

Codes

Black Ink Cartridge

T003

EPSON Iron-On Cool Peel Transfer Paper (A4)

S041154

Color Ink Cartridge

T005

EPSON Iron-On Cool Peel Transfer Paper (Letter)

S041153 / S041155

Product Description

Specifications

14

EPSON Stylus Color 900

Revision C

1.2.3 Paper Specifications

1.2.3.3 Envelope

This section describes paper specifications including paper handling
and printable area.




Paper Handling: Do not feed paper in reverse more than 9.5 mm
(0.38”).

1.2.3.1 Cut Sheet











Size:
A4:
A5:
Letter:
B5:
Legal:
Half Letter:
Executive:

[Width 210 mm (8.3”) x Length 297 mm (11.7”)]
[Width 148 mm (5.8”) x Length 210 mm (8.3”)]
[Width 216 mm (8.5”) x Length 279 mm (11.0”)]
[Width 182 mm (7.2”) x Length 257 mm (10.1”)]
[Width 216 mm (8.5”) x Length 356 mm (14.0”)]
[Width 139.7 mm (5.5”) x Length 215.9 mm (8.5”)]
[Width 184.2 mm (7.25”) x Length 266.7mm(10.5”)]

Thickness:

0.08 mm (0.003”) - 0.11 mm (0.004”)

Weight:

64g/m2 (17Ib.) - 90g/m2 (24Ib.)













Size
A4:
Letter:
A6:

[Width 210 mm (8.3”) x Length 297 mm (11.7”)]
[Width 216 mm (8.5”) x Length 279 mm (11.0”)]
[Width 105 mm (4.1”) x Length 148 mm (5.8”)]

Thickness:

0.075 mm (0.003”) - 0.085 mm (0.0033”)

Paper Types: EPSON special media

NOTE: Print on transparency at normal temperatures only.

Product Description

Thickness:

0.08 mm (0.003”) - 0.11 mm (0.004”)

Size:
No.10:
DL:
C6:
5 x 8”:

[Width 241 mm (9 1/2”) x Length 104.8 mm (4 1/8”)]
[Width 220 mm (8.7”) x Length 110 mm (4.3”)]
[Width 162 mm (6.4”) x Length 114 mm (4.5”)]
[Width 220 mm (8.7”) x Length 132 mm (5.2”)]

Thickness:

0.16 mm (0.006”) - 0.52 mm (0.02”)

Weight:

45g/m2 (12Ib.) - 75g/m2 (20Ib.)

Quality:

Bond paper, Plain paper, Airmail

NOTES:
1. Print on envelope at normal temperatures only.
2. Place the longer side of the envelope horizontal.

1.2.3.4 Index Card




Paper Types: Bond paper, Plain paper, EPSON special media

1.2.3.2 Transparency, Glossy Paper














Size:
A6 Index card:
[Width 105 mm (4.1”) x Length 148 mm (5.8”)]
5 x 8” Index card: [Width 127 mm (5.0”) x Length 203 mm (8.0”)]
10 x 8” Index card:[Width 127 mm (5.0”) x Length 203 mm (8.0”)]
Thickness:

Less than 0.23 mm (0.0091”)

Paper Types:

EPSON special media

1.2.3.5 Self Adhesive Sheets






Size
A4:

[Width 210 mm (8.3”) x Length 297 mm (11.7”)]

Paper Types:

EPSON special media

Specifications

15

EPSON Stylus Color 900

Revision C

1.2.3.6 Photo Paper







Size:
A4:
Letter:
4 x 6”:
Panoramic:

[Width 210 mm (8.3”) x Length 297 mm (11.7”)]
[Width 216 mm (8.5”) x Length 279 mm (11.0”)]
[Width 102 mm (4”) x Length 152 mm (6”)]
[Width 210 mm (8.3”) x Length 594 mm (23.4”)]

Paper Types:

EPSON special media

1.2.3.7 Photo Stickers






Size:
A6 with 4 or 16 frames:
[Width 105 mm (4.1”) x Length 148 mm (5.8”)]
Paper Types:

EPSON special media

Product Description

Specifications

16

EPSON Stylus Color 900

Revision C

1.2.4 Printable Area




Cut Sheet
See Figure 1-3 and Table 1-7 for the printable area for cut sheets.

L M

P W

R M

Table 1-7.
Minimum margin for Raster Graphics Mode / Character Mode
Paper
Size

Left Margin
(Minimum)

Right Margin
(Minimum)

Top Margin
(Minimum)

A4

3 mm (0.12”)

3 mm (0.12”)

3 mm (0.12”)

14 mm (0.54”)
3 mm (0.12”) *3

A5

3 mm (0.12”)

3 mm (0.12”)

3 mm (0.12”)

14 mm (0.54”)
3 mm (0.12”) *3

Letter

3 mm (0.12”)

3 mm (0.12”)*1
3 mm (0.12”)
9 mm (0.35”)*2

14 mm (0.54”)
3 mm (0.12”) *3

B5

3 mm (0.12”)

3 mm (0.12”)

3 mm (0.12”)

14 mm (0.54”)
3 mm (0.12”) *3

Legal

3 mm (0.12”)

3 mm (0.12”)*1
3 mm (0.12”)
9 mm (0.35”)*2

14 mm (0.54”)
3 mm (0.12”) *3

Half Letter

3 mm (0.12”)

3 mm (0.12”)

3 mm (0.12”)

14 mm (0.54”)
3 mm (0.12”) *3

Executive

3 mm (0.12”)

3 mm (0.12”)

3 mm (0.12”)

14 mm (0.54”)
3 mm (0.12”) *3

T M

P r in ta b le a r e a

P L

B M

L M :
R M :
T M :
B M :
P W :
P L :

L e ft M a
R ig h t M
T o p M a
B o tto m
P a p e r W
P a p e r L

Figure 1-3. Printable Area for Cut Sheets

Product Description

r g in e
a r g in e
r g in e
M a r g in e
id th
e n g th

Bottom Margin
(Minimum)

*1: For Raster Graphics mode
*2: For Character mode
*3: The minimum bottom margin is reduced to 3 mm when paper dimension is defined
by using the command. Otherwise, the minimum bottom margin remains 14 mm.
Note the extra printing area with the bottom margin of 3 mm is not a guaranteed
area.

Specifications

17

EPSON Stylus Color 900

Revision C


 EnvelopeSee Table 1-8 and Figure 1-4 which show the minimum
margin and printable area for envelopes, respectively.

Table 1-8. Minimum Margin for Envelopes
Paper
Size

Left Margin
(Minimum)

Right Margin
(Minimum)

Top Margin
(Minimum)

Bottom Margin
(Minimum)

#10

3 mm (0.12”)

28 mm (1.10”) 3 mm (0.12”)

14 mm (0.54”)

DL

3 mm (0.12”)

7 mm (0.28”)

3 mm (0.12”)

14 mm (0.54”)

C6

3 mm (0.12”)

3 mm (0.12”)

3 mm (0.12”)

14 mm (0.54”)

5x8

3 mm (0.12”)

7 mm (0.28”)

3 mm (0.12”)

14 mm (0.54”)

L M

R M

T M

P r in ta b le
A re a

B M

Figure 1-4. Printable Area for Envelopes

Product Description

Specifications

18

EPSON Stylus Color 900

Revision C

1.2.5 Ink Cartridge Specifications




Exclusive ink cartridge

Color:

Black

Print Capacity:

1200 pages / A4 (ISO/IEC 10561 Letter
Pattern at 360 dpi)

Ink life:

2 years from indicated production date

6 5 .9 m m






Type:

6 7 .4 m m








( R ib a r e a )

2 8 .9 m m

1.2.5.1 Black Ink Cartridge

Storage temperature:
Storage:
-20°C ~ 40°C(within a month at 40 °C)
Packing storage: -30°C ~ 40°C(within a month at 40 °C)
Transit:
-30°C ~ 60°C(within 120 hours at 60°C and
within a month at 40°C)
Dimensions:

4 1 .8 m m

28.9 mm (W) x 67.4 mm (D) x 41.8 mm (H)

2 7 .4 m m

( R ib a r e a )

Figure 1-5. Black Ink Cartridge Appearance

Product Description

Specifications

19

EPSON Stylus Color 900

Revision C

1.2.5.2 Color Ink Cartridge




Exclusive ink cartridge

Color:

Magenta, Cyan, Yellow

Print Capacity:

530 pages / A4 (at 360 dpi, 5 X duty each
color)

Ink life:

2 years from indicated production date

Storage temperature:
Storage:
-20°C ~ 40°C(within a month at 40 °C)
Packing storage: -30°C ~ 40°C (within a month at 40 °C)
Transit:
-30°C ~ 60°C (within 120 hours at 60°C and
within a month at 40°C)
Dimensions:

( R ib a r e a )

5 4 m m

6 5 .9 m m






Type:

6 7 .4 m m








54.0 mm (W) x 67.4 mm (D) x 41.8 mm (H)

NOTES
1. Do not refill the cartridge. It is a consumable item.
2. Do not used the ink cartridge whose ink life has expired.
3. Ink will be frozen below -4 °C. To use ink that is frozen, let it defrost
for at least 3 hours at room temperature.

4 1 .8 m m

5 2 .5 m m

( R ib a r e a )

Figure 1-6. Color Ink Cartridge

Product Description

Specifications

20

EPSON Stylus Color 900

Revision C

1.2.6 Electrical Specifications

1.2.7 Environmental Condition

[120V version]


















Rated voltage:

AC120V

Input voltage range:

AC99 ∼132V

Rated frequency range: 50 ∼ 60 Hz




Temperature:




Operating = 10 to 35 °C (See Figure 1-7.)
Non-operating = -20 to 60 °C *2
1 month at 40 °C
120 hours at 60 °C

Humidity:

Operating = 20% ~ 80% RH *2
(See Figure 1-7.)
Non-operating = 5% ~ 85% RH *1 *2

Input frequency range: 49.5 ∼ 60.5 Hz
Rated current:

0.4A (Maximum 0.5A)

Power consumption:

Approx.18W (ISO/IEC 10561 Letter pattern)
Energy Star compliant

H u m id ity
(% R H )
8 0 %

Insulation Resistance: 10 M ohms min.
(between AC line and chassis, DC 500 V)
Dielectric strength:

5 5 %

AC1000 V rms. 1 minute or AC1200 Vrms.
1 second (between AC line and chassis)

[220∼240V version]


















Rated voltage:

AC220V ∼ 240V

Input voltage range:

AC198 ∼ 264V

2 0 %

1 0

Rated frequency range: 50 ∼ 60Hz




Rated current:

0.2 A (Maximum 0.3A)

Power consumption:

Approx.18W (ISO/IEC 10561 Letter pattern)
Energy Star compliant

Insulation Resistance: 10M ohms min.
(between AC line and chassis, DC500V)

Product Description

5 0

2 7
8 0

3 5

9 5

( C )
( F )

Figure 1-7. Temperature / Humidity of Range

Input frequency range: 49.5 ∼ 60.5Hz

Dielectric strength:

G u a ra n te e d
A re a

AC1500 V rms.
1 minute (between AC line and chassis)




Resistance to shock:

Operating = 1G, within 1 ms
Non-operating = 2G, within 2 ms *1

Resistance to vibration: Operating = 0.15G (Operating)
Non-operating = 0.50G *1

*1: With a shipment container
*2: Without condensation

Specifications

21

EPSON Stylus Color 900

Revision C

1.2.11 CE Marking (220 ∼ 240 V version)

1.2.8 Reliability






Total print volume:

75,000 pages (A4, Letter)

Printhead life:

4000 million dots/nozzle






Low Voltage Directive 73/23/EEC: EN60950
EMC Directive 89/336/EEC:

1.2.9 Safety Approvals
[120V version]




Safety standard:

UL1950
CSA22.2 No.950




EMI:

FCC part 15 subpart B class B
CSA C108.8 class B

1.2.12 Physical Specifications






[220∼240V version]






Safety standard:

EN 60950 (VDE)

EMI:

EN55022 (CISPR Pub.22) class B
AS/NZS 3548 class B

EN55022 Class B
EN61000-3-2
EN61000-3-3
EN50082-1
IEC801-2
IEC801-3
IEC801-4

Weight:

8.4 Kg

Dimensions:

647 mm (W) x 296 mm (D) x 325 mm (H)

1.2.10 Acoustic Noise




Level:

Product Description

Approximately 47 dB (A) (According to ISO
7779)

Specifications

22

EPSON Stylus Color 900

Revision C

1.3 Interface

The /ERROR signal is LOW when one of the following error has
occurred:






The EPSON Stylus Color 900 is equipped with USB, bi-directional 8-bit
parallel interface, serial interface and a card slot for an optional Type-B
interface.

1.3.1 Parallel Interface (Forward Channel)












Printer hardware error (fatal error)
Paper Out error
Paper Jam error
Ink Out error

Transmission mode: 8 bit parallel, IEEE-1284 compatibility mode
The PE signal is at a high level during Paper Out error.
Synchronization:

By /STROBE pulse

Handshaking:

BY BUSY and /ACKLG signal

Signal level:

TTL compatible level

See Figure 1-8 and Table 1-9 which show the data transmission timing.
D A T A

d a ta b y te n + 1

d a ta b y te n
th o ld

Adaptable connector: 57-30360 (amphenol) or equivalent
-S T R O B E

The BUSY signal is set high before setting either/ERROR low or PE
high, and held high until all these signals return to an inactive state.

B U S Y

tre a d y

The BUSY signal is HIGH:







tn e x t

ts tb

ts e tu p
tb u s y

-A C K N L G
tr e p ly

During data entry (see Data transmission timing)

ta c k

tn b u s y

Figure 1-8. Data Transmission Timing

When the input data buffer is full
While /INIT signal is at LOW level or during hardware
initialization.
During a printer error condition (See /ERROR signal).
When the parallel interface is not selected.

Product Description

Interface

23

EPSON Stylus Color 900

Revision C

Table 1-9. Data Transmission Timing

Table 1-11. Signal level for TTL Compatible
(IEEE-1284 level 1 device)

Parameter

Minimum

Maximum

tsetup

500ns

---

Parameters

Minimum

Maximum

thold

500ns

---

VOH*

---

5.5V

tstb

500ns

---

VOL*

-0.5V

---

tready

0

---

IOH*

---

0.32mA

VOH = 2.4V

tbusy

---

500ns

IOL

---

12mA

VOL = 0.4V

tt-out*

---

120ns

CO

---

50pF

tt-in**

---

200ns

VIH

---

2.0V

treply

0

---

VIL

0.8V

---

tack

500ns

10us

IIH

---

0.32mA

VIH = 2.0V

tnbusy

0

---

IIL

---

12mA

VIL = 0.8V

tnext

0

---

CI

---

50pF

NOTE: tt-out shows the rise and fall time of every output signal.
tt-in shows the rise and fall time of every input signal.
Typical time of tack is shown in Table 1-10.
Table 1-10. Typical Time of Tack
Parallel Interface Mode

Typical Time of Tack

High speed

1 us

Normal speed

3 us

Product Description

COndition

* A LOW logic level on the Logic H signal is as follows:
2.0 V or less when the printer is turned off.
3.0 V or more when the printer is turned on.
The receiver provides an impedance equivalent to 7.5 K Ω to
ground.
See Table 1-12 which shows the connector pin assignment and signals
for the forward channel of the parallel interface.

Interface

24

EPSON Stylus Color 900

Revision C

Table 1-12. Parallel I/F Forward Channel
Pin No.

Signal Name

Return
GND Pin

In/Out

Functional Description

1

/STROBE

19

I

The strobe pulse. Read-in of data is performed at the falling edge of this pulse.

2

DATA0

20

I

3

DATA1

21

4

DATA2

22

5

DATA3

23

6

DATA4

24

7

DATA5

25

8

DATA6

26

9

DATA7

27

10

/ACKNLG

28

O

This signal is a negative pulse indicating that the printer can again accept data.

11

BUSY

29

O

A high signal indicates that the printer cannot receive data.

12

PE

28

O

A high signal indicates paper-out error.

13

SLCT

28

O

Always at high level when the printer is powered on.

14

/AFXT

30

I

Not used.

31

/INIT

30

I

The falling edge of a negative pulse or a low signal on this line causes the printer to
initialize. Minimum 50 us pulse is necessary.

32

/ERROR

29

O

A low signal indicates printer error condition.

36

/SLIN

30

I

Not used.

18

Logic H

----

O

Pulled up to +5V via 3.9K ohm resistor.

35

+5V

----

O

Pulled up to +5V via 3.9K ohm resistor.

17

Chassis GND

----

---

Chassis GND.

16,33,
19-30

GND

----

---

Signal GND.

15,34

NC

----

---

Not connected.

The DATA0 through DATA7 signals represent data bits 0 to 7, respectively. Each
signal is at high level when data is logical 1 and low level when data is logical 0.

*: In and Out refers to the direction of the signal as viewed from the printer.

Product Description

Interface

25

EPSON Stylus Color 900

Revision C

1.3.2 Parallel Interface (Reverse Channel)
















When IEEE1284.4 is disabled;
[00H] [5DH]
MFG:EPSON;
CMD:ESCPL2,PRPXL,BDC;
MDL:Stylus[SP]COLOR[SP[900;
CLS:PRINTER;
DES:EPSON[SP]Stylus[SP]COLOR[SP]900;

Transmission mode: IEEE-1284 nibble mode
Adaptable connector: See the forward channel.
Synchronization:

Refer to the IEEE-1284 specification

Handshaking:

Refer to the IEEE-1284 specification

Data trans. timing:

Refer to the IEEE-1284 specification

Signal level:

IEEE-1284 level 1 device
(See forward channel.)

Extensibility request:
The printer responds affirmatively when the extensibility request
values are 00H or 04H,as follows;

NOTES:
1. [00H] denotes a hexadecimal value of zero.
2. MDL value and DES value depend on the EEPROM setting.
3. CMD value depends on the IEEE1284.4 setting.
See Table 1-13 which shows pin assignment for reverse channel

00H:Request Nibble Mode Reverse Channel Transfer.
04H:Request device ID using Nibble Mode Rev Channel
Transfer.




Device ID:
The printer sends following device ID string upon request.
When IEEE1284.4 is enabled;
[00H] [60H]
MFG:EPSON;
CMD:ESCPL2,PRPXL,BDC,D4;
MDL:Stylus[SP]COLOR[SP]900;
CLS:PRINTER;
DES:EPSON[SP]Stylus[SP]COLOR[SP]900;

Product Description

Interface

26

EPSON Stylus Color 900

Revision C
Table 1-13. Pin Assignment For Reverse Channel

Pin No.
1

Signal Name
HostClk

Return GND
Pin

In/Out

19

I

Host clock signal.

20-27

I

The DATA0 through DATA7 signals represent data bits 0 to7,
respectively. Each signal is at high level when data is logical 1 and
low level when data is logical 0. These signals are used to transfer
the 1284 extensibility request values to the printer.

Functional Description

2-9

Data0-7

10

PrtClk

28

O

Printer clock signal.

11

PtrBusy, Data Bit-3,7

29

O

Printer busy signal and reverse channel transfer data bit 3 or 7.

12

AckData Req, DataBit-2,6

28

O

Acknowledge data request signal and reverse channel transfer
data bit 2 or 6.

13

Xflag, DataBit-1,5

28

O

X-flag signal and reverse channel transfer data bit 1 or 5.

14

HostBusy

30

I

Host busy signal.

31

/INIT

30

I

Not used.

32

/DataAvail, DataBit-0,4

29

O

Data available signal and reverse channel transfer data bit 0 or 4.

36

1284-Active

30

I

1284 Active Signal

18

Logic-H

----

O

Pulled up to +5V via 3.9K ohm resister.

35

+5V

----

O

Pulled up to +5V via 3.3K ohm resister.

17

Chassis GND

----

---

Chassis GND.

GND

----

---

Signal GND.

NC

----

---

Not connected.

16,33, 9-30
15,34

* In/Out refers to the direction of signal flow from the printer’s point of view.

Product Description

Interface

27

EPSON Stylus Color 900

Revision C




1.3.3 Mac Serial Interface


















Standard:

Based on RS-423

Synchronization:

Synchronous

Bit Rate:

Approximately 1.8 Mbps

Handshaking:

X-ON/X-OFF, DTR Protocol

Word Format:

Start Bit = 1 bit
Data Bit = 8 bit
Parity Bit = No parity bit
Stop Bit = 1 bit

X-ON/X-OFF, DTR protocol:See Table 1-15.

Table 1-15. X-On/X-Off and DTR Protocol
State

Buffer Space

X-ON/X-OFF

DTR

Busy

Less than 3072 bytes

Send X-OFF code

OFF

Ready

More than 5120 bytes

Send X-ON code

ON

Adaptable Connector: 8-pin mini circular connector
Recommended Cable:Apple System Peripheral-8 Cable
Connector pin assignment and signal:See Table 1-14.
Table 1-14. Pin Assignment
Pin No.

Signal
Name

I/O

Description

1

SCLK

O

Synchronous clock signal

2

CTS

I

Clear To Send

3

TXD-

O

Transmit Data (-)

4

SG

I

(Signal Ground)

5

RXD-

I

Receive Data (-)

6

TXD+

O

Balanced Transmit Data (+)

7

DTR

O

Data Terminal Ready

8

RXD+

I

Balanced Receive Data (+)

Product Description

Interface

28

EPSON Stylus Color 900

Revision C

1.3.4 USB Interface












1.3.5 Printer Language and Emulation

Standard:

Based on the following:
Universal Serial Bus Specifications Rev. 1.0
Universal Serial Bus Device Class Definition
for Printing Device Version 1.0

Printer language:

Bit Rate:

12 M bps

1.3.6 Prevention Hosts from Data Transfer time-out

Data Encoding:

NRZI

Adaptable Connector: USB Series B
Recommended Cable Length:2 meters

Table 1-16. Pin Assignment and Signal of the USB I/F
Pin No.

Signal
Name

I/O

Description

1

Vcc

----

Cable power, Maxi. power consumption
is 100 mA

2

-Data

Bi-D

Data

3

+Data

Bi-D

Data, pull up to +3.3 V via 1.5 K ohms
resistor

4

Ground

----

Cable Ground

P in # 2

P in # 1

P in # 3

P in # 4

Generally, hosts abandon data transfer to peripherals when a peripheral
is in the busy state for dozens of seconds continuously. To prevent
hosts from this kind of time-out, the printer receives data very slowly,
several bytes per minute, even if the printer is in busy state. This
showdown is started when the rest of the input buffer becomes several
hundreds of bytes. Finally, the printer is in the busy state continuously
when the input buffer is full.

1.3.7 Auto Interface Selection
The EPSON Stylus Color 900 has four types of interfaces: USB, parallel
interface, Mac serial interface and optional Type-B interface. Each
interface can be selected manually in default setting mode or
automatically.






Figure 1-9. USB Pin Assignment

Product Description

ESC/P2
IBM X24E emulation
EPSON Remote

Interface

Manual Selection:
One of four interfaces can be selected in default setting mode.
Automatic Selection:
The automatic interface selection is enabled by the default setting
mode. In this automatic interface selection mode, the printer is
initialized to the idle state scanning for which interface is to receive
data when it is powered on. The interface that receives data first is
selected. When the host stops data transfer and the printer is in the
stand-by state for a number of seconds, the printer returns to the
idle state. As long as the host sends data or the printer interface is
busy state, the selected interface is let as it is.

29

EPSON Stylus Color 900




Revision C

1.3.7.1 IEEE 1284.4 Protocol

Interface state and interface selection






When an interface other than parallel interface is selected, the
parallel interface goes into the BUSY state.
When an interface other than serial interface is selected, the
serial interface sets the DTR signal to MARK.
When an interface other than optional interface is selected, the
printer sets “OFF LINE” bit of MNSTS register to the optional
interface.
When the printer is initialized or returned to the idle state, the
parallel interface enters ready state and the serial interface sets
the DTR signal SPACE and the printer resets “OFF LINE” bit of
MNSTS register to the optional.

NOTE:An interrupt signal, such as /INIT, on the parallel interface is
not effective while that interface is not selected.

The packet protocol described by IEEE1284.4 standard allows a device
to carry on multiple exchanges or conversations which contain data
and/or control information with another device at the same time across
a single point-to-point link. The protocol is not, however, a device
control language. It does provide basic transport-level flow control and
multiplexing services. The multiplexed logical channels are independent
of each other and blocking of one has no effect on the others. The
protocol operates over IEEE1284.








Product Description

Interface

Automatic selection:
An initial state is compatible interface and starts IEEE1284.4
communication when magic strings (1284.4 synchronous
commands) are received.
ON:
IEEE1284.4 is enabled as initial state. Data sent before the magic
string (1284.4 synchronous commands) is discarded.
OFF:
IEEE1484.4 is disabled and IEEE1484.4 synchronous commands
are ignored. Compatible interface is the initial state.

30

EPSON Stylus Color 900

Revision C

1.4 Control Panel Operation

1.4.1 Indicators (LEDs)

The control panel of the EPSON Stylus Color 900 is composed of the 2
non-lock type push-buttons, 1 lock-type push-button, and 4 LEDs, as
shown below:
P a p e r O u t L E D
P o w e r L E D

In k O u t
( B la c k ) L E D
In k O u t
( C o lo r ) L E D

P o w e r B u tto n

C le a n in g
B u tto n

1. Power
Lights when the operate switch is “ON”, and AC power is supplied.
2. Paper out
Lights during the paper-out condition, and blinks during the paperjam condition.
3. Ink Out (Black)
Lights during no Black ink condition, and blinks during the Black
ink low condition.
4. Ink Out (Color)
Lights during no Color ink condition, and blinks during the Color ink
low condition.

L o a d /E je c t B u tto n

Figure 1-10. Control Panel

Product Description

Control Panel Operation

31

EPSON Stylus Color 900

Revision C

1.4.2 Panel Functions




Panel function:

1.4.2.1 Printer Setting Mode

Refer to Table 1-17.
Table 1-17. Panel Functions




Button

Function

Load/Eject
(within 2 seconds) *1

• Loads or ejects paper.
• When the carriage is in the I/C replacement position,
pressing this button returns the carriage to the capping
position.

Load/Eject
(for 2 seconds) *1

• Starts the I/C replacement sequence. *2
• Move the carriage to the I/C replacement position.

Cleaning
(for 2 seconds) *1

• Starts the printhead cleaning sequence.
• Starts the I/C replacement sequence when the printer
is in one of the following conditions:
“Ink Low”, “Ink Out”, No Ink Cartridge” *2

Cleaning
(within 2 seconds) *1

• When the carriage is in the I/C replacement position,
returns the carriage to the capping position.

*1: 3 seconds is specified in the Users Guide.
*2: This operation is not effective in printing status.

While turning the printer on, press the Cleaning button, and the Paper
Out LED starts blinking. This operation must be followed by pressing
the specified button while the Paper Out LED is still blinking to enter the
Default setting mode or Printhead alignment mode, as described in
Table 1-19.
Table 1-19. Printer Setting Mode
Button

Function / Operation

Cleaning or no button

While the Paper Out LED is blinking, pressing
the Cleaning or no button generates the
Default setting mode. *1

Load/Eject
(Press it within 10 seconds.)

While the Paper Out LED is blinking, pressing
the Load/Eject button generates the Printhead
alignment mode.

Load/Eject
Changes the default for the parallel I/F
(Hold it down for 10 seconds.) communication protocol. *2

*1: Leaving the Paper Out LED blinking without pressing any button also generates
the Default setting mode.
*2: Not intended for users. This function is used only for troubleshooting.

Panel function with power on:Refer to Table 1-18.
Table 1-18. Panel Function with Power On
Button
Load/Eject

See the following pages for detailed information on the default setting
mode and the Printhead alignment mode.

Function
1) Starts the status print. *1

Cleaning

Enters the printer setting mode. (The Paper Out LED starts
blinking.) *2
Specified button must be then pressed while the LED is
blinking to activate each mode. (See Section 1.4.2.1.)

Load/Eject
+
Cleaning

Enters the special setting mode. (Factory use only)
Specified button must be then pressed while the Paper Out
LED is blinking to activate each mode. (See Section
1.4.2.2.)

*1: The status print includes firmware version, ink counter, and nozzle check
pattern.

Product Description

Control Panel Operation

32

EPSON Stylus Color 900




Revision C

Default setting mode
Some printer setting parameters can be changed by users and will
be referred at the time of printer initialization. The setting method is
as shown below:

Table 1-21. Default Setting Menu (continued)
I/F mode

Auto, Parallel, Serial, USB, Optional

Auto I/F wait mode

10 seconds, 30 seconds

2. Select the desirable language for “Usage of this mode” by pressing
the Cleaning button.

Network I/F mode

This mode is for the network environment only.
Off: Used in a usual environment.
On: Used in the network environment.

3. Press Load/Eject button. The current setting and the “Usage of this
mode” in the selected language is printed.

Parallel I/F transfer rate

Fast, Normal

Software

ESC/P2, IBM X24E

4. Select the menu by pressing the Cleaning button.

Auto CR (IBM mode only)

On, Off

5. Press the Load/Eject button to enter the value selection phase of
the selected menu.

A.G.M (IBM mode only)

On, Off

Auto line feed

On, Off

6. Select the value by pressing the Load/Eject button.

0 slash

0, 0

Character tables


Italic USA
Italic UK
Italic Italy
PC 850
PC865
Abicomp
PC 858

Character tables

In addition to the Standard version:

1. Enter the Default setting mode.

7. Press the Cleaning button. The printer memorizes the selected
setting value, and returns the indication to the main menu.
8. Repeat the steps from 4 to 7. The menu selection will return to the
first menu after the last menu selection is over.
9. Turn the printer off. The new settings are stored in the non-volatile
memory.



Table 1-20. Default Setting Menu

Font

Roman, Sans Serif, Courier, Prestige, Script, Roman
T, Sans Serif H, Draft

Pitch

10 cpi, 12 cpi, 15 cpi, 17 cpi, 20 cpi, Proportional

Print direction

Auto, Bi-D, Uni-D

Loading Position

3 mm, 8.5 mm, Others

PC437 Greek
PC852
PC869
ISO 8859-7
PC 774
PC 866 LAT
PC 708
PC 437

Italic France
Italic Denmark
Italic spain 1
PC 860
PC 861
Roman 8
ISO 8859-15

PC 853
PC 857
MAZOWIA
ISO Latin 1T
Estonia
PC 866 UKR
PC 720

Italic Germany
Italic Sweden
PC 437
PC 863
BRASCII
ISO Latin 1

PC 855
PC 866
Code MJK
Bulgaria
ISO 8859-2
PC APTEC
PC AR864

*: Underlined values are the defaults for the EEPROM reset.

Product Description

Control Panel Operation

33

EPSON Stylus Color 900




Revision C

1.4.2.2 Special Setting Mode

Printhead alignment mode

Alignment method is as described below:
1. While holding down both Load/Eject and Cleaning (Black) buttons,
turn the printer on.

While turning the printer on, pressing the both Load/Eject and Cleaning
buttons generates the Special setting mode. While the Paper Out LED
is blinking, activate each function by pressing the specified button(s) in
the method described in Table 1-22.

2. Printer prints an instruction sheet that shows how to adjust the
printer and current alignment.
3. Referring to the current alignment, press the Cleaning button until
the LED indicate the appropriate test number.

Table 1-22. Special Setting Mode
Switch

Load/Eject

4. Press the Load/Eject button. The printer prints the test pattern.
5. Referring to the test patterns on the new printout, select the most
closely aligned pattern by pressing the Load/Eject button.

Function
While the Paper Out LED is blinking, pressing
the Load/Eject button initializes the EEPROM
and resets the timer IC. (Refer to EEPROM
Address Map in Appendix.)

While the Paper Out LED is blinking, pressing
Cleaning
the Cleaning button for 10 seconds resets the
(Hold it down for 10 seconds) waste ink counter in the EEPROM. (Refer to
EEPROM Address Map in Appendix.)

6. Press the Cleaning button.
7. Repeat the steps from 3 to 6 until all test patterns are properly
aligned.
8. Turn the printer off.

Product Description

Control Panel Operation

34

EPSON Stylus Color 900

Revision C

1.4.3 Printer Condition and Panel Status
Table 1-23 shows printer condition and panel status. Since the table
shows various error status and also indicates printer status, it enables
you to find appropriate repair ways.

Table 1-23. Printer Condition and Panel Status
Indicators
Printer Status

Product Description

Priority

Power

Ink Out
(Black)

Ink Out
(CMY)

Paper Out

Power on condition

On

---

---

---

9

Ink Sequence mode

Blink

---

---

---

6

I/C replacement mode

Blink

---

---

---

5

Data processing

Blink

---

---

---

8

Paper Out

---

---

---

On

4

Paper Jam

---

Off

Off

Blink

3

No I/C, Ink Out (Black)

---

On

---

---

7

Ink level low (Black)

---

Blink

---

---

7

No I/C, Ink Out (CMY)

---

---

On

---

7

Ink level low (CMY)

---

---

Blink

---

7

Enters the EEPROM and
Timer IC Reset

---

ON (for 1 second only)

---

Maintenance Request

Blink

Blink

Blink

Blink

2

Fatal Error

Blink

On

On

Blink

1

Control Panel Operation

35

EPSON Stylus Color 900

Revision C

1.5 Error Status

1.5.4 No Ink Cartridge

When any of the following status occurs, the printer goes in the error
status and stops receiving data, setting the /ERROR signal in the
interface to “Low”, and Busy signal to “High”. During this condition, the
printer is in non-printable status. Refer to Section 1.4.3 for detailed LED
Panel indicator status and corresponding error types.

1.5.1 Ink Out
When the printer has run out the most of the ink of any color, it warns of
Ink Low condition and keeps printing. When the printer runs out the
whole ink of any color, it stops printing and indicates the Ink Out error.
User is required to install a new ink-cartridge in this state. Note if an inkcartridge has been taken out, it should never be used again.
Reinstalling the used cartridge (not fully filled with ink) upsets the ink
level detection and may cause a serious problem in the printhead as a
result.
C A U T IO N

When the printer detects that the ink cartridge has come off, it goes into
the No ink cartridge error.

1.5.5 Maintenance Request
When the total quantity of ink wasted through the cleanings and flushing
has reached the limit, printer indicates this error and stops printing. The
absorber in the printer needs to be replaced with a new one by a service
person.

1.5.6 Fatal Errors
When the printer detects the carriage control error or CG access error, it
enters the fatal error condition.

Never use an ink cartridge that has been removed.

1.5.2 Paper Out
When the printer fails to load a sheet, it goes into the Paper Out error
condition.

1.5.3 Paper Jam
When the printer fails to eject a sheet, it goes into the Paper Jam error
condition.

Product Description

Error Status

36

EPSON Stylus Color 900

Revision C

1.6 Printer Initialization
The EPSON Stylus Color 900 is equipped with three types of
initialization methods.




Power-on initialization
The printer is initialized when it is turned on or recognizes the coldreset command (remote RS command). When the printer is
initialized, it performs the following:
(a) Initializes the printer mechanism.
(b) Clears the input data buffer.
(c) Clears the print buffer.
(d) Sets the default values.




Operator initialization
This printer is initialized when it is turned on again within 10 seconds
after last power off or recognizes the /INIT signal (negative pulse) of
the parallel interface. When printer is initialized, it performs the
following:
(a) Caps the printhead.
(b) Ejects a paper.
(c) Clears the input data buffer.
(d) Clears the print buffer.
(e) Sets the default values.




Software initialization
The ESC@ command also initializes the printer. When the printer is
initialized, it performs the following:
(a) Clears the print buffer.
(b) Sets the default values.

Product Description

Printer Initialization

37

EPSON Stylus Color 900

1.7 Component Layout
The main components of the Stylus Color 900 are as follows:
1) Printer mechanism
2) C265 Main board
3) C265 PSB/PSE board
4) C265 panel board
5) C265 relay board

Product Description

Revision C

1.7.1 Printer Mechanism
The printer mechanism of the Stylus Color 900 has black and color
heads united in one unit which drives larger amount of nozzles (180
nozzles in total) than ever. Also, for a new ink jet printer feature, the
printer has succeeded in printing in the acceleration/deceleration areas
by reading the slits on the linear scale to improve the throughput. This
improvement in throughput mostly depends on the Pump/ASF switching
mechanism. In other printers, the gear trains are switched when the
trigger lever hits the mechanism along with the carriage’s movement. In
Stylus Color 900, however, the exclusive solenoid is directly attached to
the mechanism instead. With the solenoid which switches drive at a
higher speed, the printer can control high-speed paper ejection system:
the printer bring the leading edge of the second sheet to the printing
position just before ejecting the first sheet.
The motors equipped with the printer are CR motor, PF motor, and the
Pump/ASF Motor, same as for the Stylus Color 800.

Component Layout

38

EPSON Stylus Color 900

Revision C

1.7.2 C265 Main Board

However, the valuable dot system of this printer enables the printer
to fire three different sizes of dots in one raster, and ink-jet specific
adverse conditions such as uneven printing and white banding are
improved as a result.

The main features of the C265 Main board are as follows.
1. IEEE1284 compliant
ECP mode is available
Type-B I/F is available
2. Mac serial I/F is available (at 900 K bps, 1.8 M bps, 3.6M bps).

The C265 Main board is also equipped with a CG-ROM which deals
with DOS users. The CG ROM attachment condition and size are as
shown in Table 1-24.
Table 1-24. Relation between P-ROM and CG ROM

3. USB full-speed is available (at 12 M bps without the hub).
4. All motors (CR motor, Pump/ASF motor, and PF motor) are
controlled with the micro step system (using up to 4W1-2 phase
excitation mode) and current attenuation mode (First, Slow, Mixed,
and Decay).

Destination

P-ROM

CG-ROM

Standard version

16 M (TEE01X)

Not installed.

NLSP version

16 M (TEE01X)

16M (M160B16XA)

NOTE:The “X” in the table represents the version.

5. Intensive temperature control of the new type of the printhead:
operates the cooling fan using the thermistors and the abnormal
temperature detection circuit on the printhead board.
H8S2357, a CPU which is the hub of the C265 Main board, has an
internal flash memory with the size of 128 KB. Since the CPU runs with
24 MHz, it can send print data efficiently for a high throughput. The
C265 Main board has two independent exclusive ASICs, ASIC1 and
ASIC2. The former controls all interfaces but the USB I/F and sensors,
while the latter controls the printhead, motors, encoder, and USB I/F.
The combined IC (IC8) which has a normal timer IC and EERPOM in
one chip also features the printer. Since the EEPROM counts ink
consumption at the valuable printing *1, its size has increased to 2 K bit.
*1: The valuable dot system, or many-valued dot system, enables the
printer to freely fire three different sizes of dots (normal, middle, and
small dots) in one raster. In other printers, if the super micro dot
mode is once selected through the printer driver, the printers prints
only in the selected mode until the current print data is completed.

Product Description

Component Layout

39

EPSON Stylus Color 900

Revision C

( IC 1 1 ) P F M o to r D r iv e r

IC 5 (D -R A M )
IC 2 (E 0 5 B 5 9 )

IC 4 ( O n e - tim e P R O M )
C N 3

C N 1

( IC 1 2 ) C R M o to r D r iv e r

C N 4

C N 1 3

T h e r m is to r ( d e te c ts te m p e r a tu r e
o f th e h e a t s in k )
Q 5 ( u p p e r ) , Q 6 ( lo w e r )
C h a r g in g /D is c h a r g in g d r iv e r
fo r d r iv in g th e b la c k n o z z le s
C N 9

C N 1 0

Q 3 ( u p p e r ) , Q 4 ( lo w e r )
C h a r g in g /D is c h a r g in g d r iv e r
fo r d r iv in g th e c o lo r n o z z le s

C N 1 5

C N 2

C N 5

C N 6

C N 1 1
C N 1 6
C N 1 2

IC 1 (C P U :H 8 S )

IC 3 (E 0 5 B 6 0 )
IC 6 (C G R O M )
IC 8 ( T im e r & E E P R O M )
L ith iu m

B a tte ry

IC 1 3 (u p p e r),
IC 1 4 ( lo w e r )
A S F M o to r D r iv e r

C N 8

C N 1 4

H e a t S in k
T h e r m is to r ( d e te c ts te m p e r a tu r e
o n th e p r in th e a d b o a r d )
IC 1 6 ( u p p e r ) , IC 1 5 ( lo w e r )
H e a d p r e - d r iv e r

Figure 1-11. C265 Main Board

Product Description

Component Layout

40

EPSON Stylus Color 900

Revision C

1.7.3 C265 PSB/PSE Board
IC 5 1 ( + 5 V r e g u la to r )
T 1 (T ra n s )
D 5 1 ( D io d e )

There are two types of the C265 power supply board as listed below.



W A R N IN G

C265 PSB board:For America, Japan, part of South east Asia

D a n g e r!
Q 1 (F E T )

C265 PSE board:The rest of all regions
Never touch the heat sink (radiation plate) on the Q1
with your bare hands as it is not insulated. Otherwise,
you will get an electrical shock.

The C265 PSB/PSE board uses the switching regulator system. Since
the C265 PSB/PSE board uses the power switch on the secondary side,
it keeps applying voltage to the primary side across the T1. Especially,
the heat sink to which the Q1 is attached can not be insulated due to the
circuit’s formation. Therefore, to avoid an electrical shock, be careful not
to touch the heat sink and other metallic parts simultaneously while
troubleshooting.

C N 3
C N 2

C N 1
F 1 (F u s e )

C 1 1 ( fo r s m o o th in g )

C 1 ( N o is e c u t c a p a c ito r )
D 5 5 ( D io d e )
L 1 (N o s e c u t re a c ta n c e )

Figure 1-12. C265 PSB/PSE Board

Product Description

Component Layout

41

EPSON Stylus Color 900

Revision C

1.7.4 C265 PNL Board

1.7.5 C265 Relay Board

The C265 panel board is composed of the three switches and four
LEDs.

The C265 relay board is installed to relay the following with connectors:

L E D 2

L E D 3






Power for driving motors and sensors
Control signals

If any of the connectors is connected to a wrong position during
assembly, the printer shows a fatal error at power on.

L E D 1
L E D 0

C a r r ia g e h o m e p o s itio n ( C R H P ) s e n s o r
C a r r ia g e ( C R ) M o to r

S W 2

M /C

S W 0

S W 1

P u m p /A S F M o to r
M /C

W H T

R E D

1 2

P E

Figure 1-13. C265 PNL Board

B L K

1

C R H

C N 1

P a p e r F e e d (P F ) M o to r
C o n n e c to r fro m th e C N 1 1
o n th e C 2 6 5 M a in B o a r d
C o
o n
C o
o n

n n
th
n n
th

e c
e C
e c
e C

to r
2 6
to r
2 6

fro m th
5 M a in
fro m th
5 M a in

e C
B o
e C
B o

N 1 2
a rd
N 1 0
a rd

A S F

C o n n e c to r fro m th e C N 1 6
o n th e C 2 6 5 M a in B o a r d
M /C

C o n tro l P a n e l
A S F S e n s o r

S o le n o id
m e c h a n is
C o n n e c to r
o n th e C 2 6

( S w itc h e s A S F /P U M P
m )
fro m th e C N 1 5
5 M a in B o a r d

P E S e n s o r

Figure 1-14. C265 Relay Board

Product Description

Component Layout

42






OPERATING PRINCIPLES

EPSON Stylus Color 900

Revision C

2.1 Overview

2.2 Printer Mechanism Operating Principles

This chapter describes the operating principles of the printer
mechanism and electrical circuits.

The EPSON Stylus Color 900 uses a new type of printhead. It has black
and color heads united in one unit which includes a total of 480 nozzles:
192 nozzles for black (96 nozzles x 2) and 96 nozzles for each color.
This printhead enables the printer to print 3 lines by one pass at 10-cpi
printing. Also, new ASF/pump switching mechanism offers higher
throughput with quick feeding motion at continuous printing by
combining the trigger solenoid and independent pump/ASF motor.
Production of PTS signal using the encoder belt also enables the printer
to improve printing accuracy, detect paper jam in the CR operational
range, and print during acceleration/deceleration (on normal paper / 360
x 360 dpi only).
See Figure 2-1 for the printer mechanism block diagram.

Operating Principles

Overview

44

EPSON Stylus Color 900

Revision C

P F d r iv e g e a r ( h ig h - p r e c is io n g e a r )
H ig h - p r e c is io n p in io n

A S F s e n s o r ( fo r p h a s e d e te c tio n )
A S F c a m

P F m o to r
F la s h in g p o s itio n ( th e 8 0 th c o lu m n s id e )
P T S e n c o d e r

A S F d r iv e s h a ft

P a p e r e je c t s u b r o lle r
B la c k I/C d e te c tio n le v e r
C o lo r I/C d e te c tio n le v e r
C R

P a p e r lo a d r o lle r s

u n it

U n ite d p r in th e a d fo r b la c k a n d c o lo r
T im in g b e lt
C a p

P E (P a p e r E n d ) s e n s o r
P u m p /A S F m o to r
A S F s o le n o id ( fo r s w itc h in g th e
A S F , p u m p g e a r tr a in s )

V a lv e fo r c a p p in g

P u m p
C R H P s e n s o
C R
P F r o lle r ( p o w d e r y - c o a te
E n c o

r
g u id e s h a ft
d r o lle r )
d e r b e lt

C R

m o to r

Figure 2-1. The Stylus Color 900 Printer Mechanism Block Diagram

Operating Principles

Printer Mechanism Operating Principles

45

EPSON Stylus Color 900

Revision C

2.2.1 Carriage Mechanism

Table 2-2. CRHP Sensor Specifications

As shown in Figure 2-1, the carriage unit with the printhead on it moves
right and left, depending on the rotational direction of the CR (Carriage)
motor. Table 2-1 shows the CR motor specifications.
Table 2-1. CR Motor Specifications
No.

Item
Motor Type

4-phase / 200-pole / HB-type stepping motor

2

Drive voltage

42 VDC ± 5% (Applied to the driver)

3

Coil resistance

5.8 Ω ± 10%

4

Drive mode

Bipolar constant current drive

Specifications

1

Type

Photoelectrical transfer system
(SHARP GP1S73P2)

2

Drive voltage

5 V ± 5%

3

Collector resistance

30 VDC or less

Table 2-3. CRHP Sensor Switch Mode
CR Position

The CR unit position is always memorized and controlled by the CRHP
(Carriage Home Position) sensor. This sensor confirms the CR position
to renew the memory at the following timing:




Item

Specifications

1






No.

When power is turned on / off
When a head cleaning operation, including initial ink charge, is
performed.
When the printer returns to a ready status because the printer
has executed print job or receives no data for one second or
more.

Switch mode

Sensor output

Within the CRHP
range

Open

0.7 VDC or less

Off the CRHP range

Close

2.4 VDC or more

If this sensor is defective or does not work, it does not detect the
carriage while the carriage is in the home position seek mode. In this
case, the printer cuts off electricity to the CR motor and shows a fatal
error.
Like the Stylus Pro5000, the Stylus color 900 also uses a linear encoder
to obtain secure carriage movement and accurate print timing. The
linear encoder reads slits on the encoder belt (linear scale) above the
timing belt to control the carriage. See Table 2-4 for the linear encoder
specifications.

See Table 2-2 and Table 2-3 which show the CRHP sensor
specifications and CRHP sensor switch mode, respectively.

Operating Principles

Printer Mechanism Operating Principles

46

EPSON Stylus Color 900

Revision C

Table 2-4. Linear Encoder Specifications
No.

Item

Specifications

Table 2-5. Ink Cartridge Sensor Specifications
No.

Item

Specifications

1

Type

Radiative Incremental encoder module

1

Detection type

Using a micro switch

2

Drive voltage

5 VDC ± 5%

2

Rated voltage

5 VDC ± 5%

3

Output
waveform

Phase A/B 2-channel digital output (TTL level)

3

Rated current

10 mA

4

Contact resistance

50 mΩ

4

Minimum step

1/180 inch (increment of the lines on the linear scale)

5

Response
frequency

20 KHz

Table 2-6. Ink Cartridge Sensor Switch Mode

The ASIC (IC2) reads the linear scale (increment: 1/180 inch) and
internally divides data by 8. The read information is used to produce
basic drive frequency for 2880-dpi trapezoidal waveform production.
If the encoder is defective or in an undetectable condition, the printer
generates a fatal error immediately after power on. This error occurs
before the carriage’s home position seeking operation.

Cartridge

Sensor Status

Sensor Output

Absent

Open

2.4 VDC or more

Present

Closed

0.7 VDC or more

If the ink cartridge sensor is defective or in an endetectable condition,
the printer shows No Ink Cartridge Error immediately after the printer is
turned on.

Beside detecting the carriage position, the CRHP sensor also serves to
determine whether or not the carriage is working properly. If the setting
signals (pulses) sent from the encoder do not reach the specified level
while the CR is moving in the acceleration / constant / deceleration
modes in its operative range, the program consequently assumes that
paper is jamming or the carriage is operating irregularly, and shows the
paper jam error by bringing up the LEDs of the corresponding
combination.
The printer is equipped with 2 actuators used to detect the ink
cartridges in the carriage unit driven by the CR motor. The printer,
however, is designed to operate the actuators only when both black
and color ink cartridges are installed. See Table 2-5 and Table 2-6 for
the ink cartridge sensor specifications and ink cartridge sensor switch
mode, respectively.

Operating Principles

Printer Mechanism Operating Principles

47

EPSON Stylus Color 900

Revision C

2.2.2 Printing Mechanism

2. Receiving the signal, the Pre-driver outputs the head drive pulse
signal to the driver.

The printing mechanism of the printer is all included inside the
printhead. The printing method is EPSON-exclusive MACH system,
which is used in other EPSON ink jet printers, but the printhead is not
compatible with any other printer. See Figure 2-2 for the printing
mechanism block diagram.

N o z z le
S e le c to r
T e m p e ra tu re
d e te c tio n
c ir c u it

+ 4 2
P u ls e
L a tc h
c ir c u it
P re D r iv e r

P Z T
C a v ity

D is - c h a r g e
P u ls e fo r m
D a ta

N o z z le

D r iv e r

C h a rg e
c o m m a n d

3. If no printing data is sent, pulse output from the driver is not applied
to the PZT in the printhead: because the transistor on the nozzle
selector is not on.
4. If any printing data is sent from a PC, 5 serial data (3 for Y, M, and
C, and 2 for 2 rows of black) are sent to the nozzle selector from the
ASIC. Each serial data consists of 96 data since each row is
composed of 96 nozzles. When these data is all transferred, a Latch
signal is output from the ASIC to the nozzle selector after specified
period of time.
5. When the Latch signal is sent, a PZT signal is applied to the base
side of the transistor via the latch circuit in the nozzle selector.

A S IC

L a tc h
T e m p e ra tu re d a ta

N o z z le P la te

Figure 2-2. Printing Mechanism Block Diagram
The printing mechanism performs printing by applying voltage to the
PZT (integrated piezoelectric element) inside the printhead. With the
voltage applied to the PZT, the cavity, a tank filled with ink, is pressed
by the PZT and ejects ink from nozzles as the result. Unlikely to the
illustration, the actual number of the PZT included in the printhead in
this printer is 480, the same number as nozzles, and each PZT is
independently driven.
The steps below describes how the printing mechanism works.

6. Head drive pulse constantly output from the driver is then applied to
the PZT by the pulse output after a set of serial data and the latch
signal are all transferred.
7. The PZT drive pulse radiates large heat since it is driven with the
basic drive frequency of 32.4 K Hz and also has such a large
amount of drive elements as 480 PZT. Therefore, the abnormal
temperature detection circuit is included in the nozzle selector to
detect temperature of each nozzle so that heat radiation stays under
the maximum level. If the circuit detects abnormally high
temperature in any nozzle row, the printer regards the condition as
an accidental printing malfunction such as dot missing, and it
automatically enters the cleaning CL2, the most powerful cleaning
cycle. See the sensor descriptions in Chapter 2 for the operations
after this cleaning. The printhead also has the thermistor in it to
subtly change the voltage level of the drive pulse in accordance with
the temperature condition in use.

1. Head drive pulse form command signal is output from the ASIC after
the printer is turned on.

Operating Principles

Printer Mechanism Operating Principles

48

EPSON Stylus Color 900

Revision C

[Nozzle configuration]

2.2.3 Paper Load Mechanism

See Figure 2-3 for the nozzle configuration of the Stylus Color 900.

The paper load mechanism transports paper set in the hopper in the
ASF into the printer. It is operated by the ASF and the pump/ASF motor
which drive the ASF. The pump/ASF motor specifications are as shown
in Table 2-7.

# 9 6
# 9 5
# 9 4
# 9 3

# 9 6

3 6 0 d p i
1 8 0 d p i

# 9 5
# 9 4
# 9 3

# 3
# 2
# 1

# 3
# 2
# 1
R o w A ( B la c k 1 )
R o w B ( B la c k 2 )

# 9 6

# 9 6

# 9 5

# 9 5

# 9 4

# 9 4

# 9 3

# 9 3

# 3

# 3

# 2

# 2

# 1

# 1

R o w C (M a g e n ta )
R o w E ( Y e llo w )
R o w D (C y a n )

Table 2-7. Pump/ASF Motor Specifications
No.

Items

Specifications

1

Type

4-phase / 48-pole / PM-type stepping motor

2

Drive voltage

42 VDC ± 5% (Applied to the driver)

3

Coil resistance

7.0 Ω ± 10%

4

Drive mode

Bipolar constant current drive mode

The ASF rotates the semicircular roller once in reverse before
transporting paper into the printer. Along with this motion, the cam in the
semicircular roller pushes up the return lever. The return lever then
bounces up with tension spring force. As the result, some paper which
was fallen off the hopper during the previous feeding motion is all
aligned and set back in the hopper. This so called paper return
operation is performed for each paper feeding motion. Therefore, paper
loading accuracy is improved. See Figure 2-4 which shows how the
ASF feeds paper.

Figure 2-3. Nozzle Configuration
As shown in the figure, the black nozzles are aligned at 360 dpi
(vertical) and the color nozzles are aligned at 180 dpi. In the color
printing mode, only “B” row among 2 black nozzle rows is used and the
other row “A” is not used. (The same mechanism is used for the
microweave printing.)

Operating Principles

Printer Mechanism Operating Principles

49

EPSON Stylus Color 900

Revision C

After a paper loading motion is completed, the semicircular roller rotates
in the normal direction to load the top paper in the stack. This operation
is enabled by the correct phase of the gears in the ASF, because the
timings for the semicircular roller’s contacting the paper surface by the
corner (A) and the hopper’s being pushed out must be coincided. The
ASF sensor is used to determine the condition whether the phase is
correct or not. The transmission system of the ASF sensor detects the
condition by catching the position of the cam attached onto the same
shaft as the semicircular roller is. See Table 2-8 and Table 2-9 for the
ASF sensor specifications and its switch mode, respectively.

P in c h r o lle r
H o p p e r

S e m ic ir c u la r C a m
r o lle r

3 )

4 )

A

Table 2-8. ASF Sensor Specifications
No.

Item

Specifications

1

Type

Photoelectric transfer system (transmission
type)

2

Collector voltage

30 VDC or less

3

Coil resistance

5 VDC ± 5%

Table 2-9. ASF Sensor Switch Mode
ASF Position

Sensor Status

Sensor Output

Home position

Open

0.7 VDC or less

Off the home
position

Close

2.4 VDC or more

Note that torque from the pump/ASF motor is transmitted to the pump
unit depending on the pump/ASF mechanism condition. The rotational
directions and corresponding functions are as shown in Table 2-10.
Table 2-10. ASF/Pump Motor Functions
Direction

1 )
2 )

Functions for ASF

Normal rotation
(CW)

• Reverse rotation of the
paper loading roller
(paper return control)

• Connection to the pump
gear train
• Normal rotation of the
pump (absorption)
• Releases the CR lock.
• Sets the wiper.

Reverse rotation
(CCW)

• Connection to the ASF
gear train
• Normal rotation of the
loading roller (paper
separation, paper
loading)

• Reverse rotation of the
pump motor
• Locks the CR.
• Resets the wiper.

S e p a r a tio n p a d

R e tu r n le v e r
[R e a d y s ta tu s ]

[A c tiv e S ta tu s ]

Figure 2-4. ASF Paper Load Mechanism

Operating Principles

Functions for the ink
system

Printer Mechanism Operating Principles

50

EPSON Stylus Color 900

Revision C

2.2.4 Paper Feed Mechanism

See Table 2-12 and Table 2-13 for the PE sensor specifications and the
PE sensor switch mode, respectively.

The paper feed mechanism manages constant paper feeding during
printing through to paper ejection. Unlike previous models, the PF motor
of this printer only drives the paper feed mechanism, having no
connection with the carriage lock mechanism nor the pump mechanism.
See Figure 2-5 and Table 2-11 for the cross section of the paper feed
mechanism and the PF motor specifications, respectively.
Table 2-11. PF Motor Specifications
No.

Items

Table 2-12. PE Sensor Specifications
No.

Item

Specifications

1

Type

Transmission-type photoelectric transfer
system

2

Drive voltage

5 VDC ± 5% (Applied to the driver)

3

Collector resistance

30 VDC or less

Specifications

1

Type

4-phase / 200-pole / HB-type stepping motor

2

Drive voltage

42 VDC ± 5% (Applied to the driver)

3

Coil resistance

8.1 Ω ± 10%

4

Drive mode

Bipolar constant current drive mode

For the printer-specific feature, the PF motor pinion transfers torque to
the PF drive gear without any transmission gear in between. The gears
used for the PF motor pinion and the PF drive gear are very precise.
Therefore, note the points below when handling them:

Table 2-13. PE Sensor Switch Mode
Paper
installation

Switch mode

Output voltage

Not installed

Open

0.7 VDC or less

Installed

Closed

2.4 VDC or more

A c tu a to r
N o tc h e d r o lle r

S u b r o lle r

P a p e r
P E s e n s o r

P F d r iv e g e a r

1. Do not touch the gear surface with your bare hands.
2. Keep other parts or tools for servicing such as screw drivers away
from the gears.
The PE sensor in the paper feed mechanism is used to check the
following:
1. During paper loading, checks if the leading edge of the paper from
the ASF is correctly transported.
2. Checks if the paper loaded meets the specifications.
3. Checks if the paper is properly ejected after printing is over.
4. Checks if paper is jamming.

Operating Principles

P a p e r e je c tio n
r o lle r

P F (p o w d e ry -c o a te d )
r o lle r
P F m o to r p in io n

Figure 2-5. Paper Feed Mechanism

Printer Mechanism Operating Principles

51

EPSON Stylus Color 900

Revision C

2.2.5 Pump/ASF Switch Mechanism
The pump/ASF switch mechanism switches the motor’s torque between
the paper-loading and the pump-system sides. The pump/ASF motor
supplies torque, and a solenoid is used as switching trigger. (Refer to
Section 2.2.3 for the pump/ASF motor specifications.) Figure 2-6 shows
how the pump/ASF mechanism works when switching to the ASF gear
train.

1. In the pump gear train condition, the gear (3) in the planetary gear
set and the pump transmission gear are in mesh.
2. The pump/ASF motor rotates in the normal direction (CW).
3. The whole planetary gear set tries to move up, but the solenoid
suppresses it.

[Switching to the ASF gear train]

R e d u c tio n g e a r
A S F tr a n s m is s io n g e a r

Figure 2-6 shows the gear condition after switching to the ASF is
completed. The steps below describe how the gears move to switch
from pump gear train to the ASF gear train.

P la n e ta r y g e a r s e t

4. The solenoid comes on, allowing the whole planetary gear set to
move up. At this point, the gear (3) does not rotate, but the motor
pinion gear and gear (2) rotate in mesh.
5. The gears (3) and (4) come in mesh and connection to the ASF gear
train is fixed when a corner of the solenoid is aligned with the notch
in the planetary gear set.
6. Then the gears (4) and (5) are meshed. The gear (5) is connected to
the ASF drive gear in the printer mechanism to rotate the roller in
the ASF reverse (for paper return mechanism). (Refer to Section
2.2.3 for the paper return mechanism.)

P u m p /A S F m o to r

S o le n o id
P u m p tr a n s m is s io n g e a r

Figure 2-6. Switching Operation to the ASF Gear Train

Operating Principles

Printer Mechanism Operating Principles

52

EPSON Stylus Color 900

Revision C
The steps below show how the gears move to switch from the ASF gear
train to the pump gear train.

[Switching to the pump gear train]
Figure 2-7 shows the gear condition after switching to the pump gear
train is completed.

7. In the ASF gear train condition, the gears (3) and (4) are in mesh.
8. The pump/ASF motor rotates reverse (CCW).

A S F tr a n s m is s io n g e a r

9. The planetary gear set tries to move down, but the solenoid
prevents it.
10. The solenoid comes on allowing the whole planetary gear set to
move down. At this point, the gear (3) does not rotate, but the motor
pinion gear and the gear (2) rotate in mesh.
11. The gears (3) and (4) come in mesh, and the connection to the
pump gear train is fixed when a corner of the solenoid is aligned
with the notch in the planetary gear set.

P u m p /A S F m o to r

12. The gear (4) meshes with the pump transmission gear in the printer
mechanism to perform CR lock and pump drive operations.
S o le n o id
P la n e ta r y g e a r s e t

P u m p tr a n s m is s io n g e a r

Figure 2-7. Switching to the Pump Gear Train

Operating Principles

Printer Mechanism Operating Principles

53

EPSON Stylus Color 900

Revision C

2.2.6 Pump / Carriage Lock / Head Cleaner Mechanism
The pump mechanism operates in accordance with the carriage lock
and head cleaner control mechanisms. Figure 2-8 illustrates the
process of torque transmission from the pump/ASF motor to each
mechanism.

U n lo c k e d

L o c k e d

In th e p u m p g e a r tr a in c o n d itio n

O n th e
s a m e s h a ft

P r e s s u r e r o lle r
( le ft)
P u m p tr a n s m is s io n g e a r

P r e s s u r e r o lle r
( r ig h t)

P u m p in te r m itte n t g e a r
C lu tc h
S p a c e r
C o m p r e s s io n s p r in g
C le a n e r h e a d

F ra m e

Figure 2-8. Pump / Carriage Lock / Head Cleaner Mechanism

Operating Principles

Printer Mechanism Operating Principles

54

EPSON Stylus Color 900

Revision C

The steps below explain the process of driving each mechanism.
1. The precondition for driving the pump, carriage lock, and head
cleaner is that the pump/ASF switch mechanism is switched to the
pump gear train. (Refer to Section 2.2.6.)
2. Drive from the pump/ASF motor is transmitted via:
1) pump transmission gear (black) → 2) pump intermittent gear
(black) → 3) pressure roller (right) (pump drive roller: flesh color)
3. Along the way, the drive is also transmitted to the carriage lock
lever. The carriage lock lever is released with normal rotation of the
pump/ASF motor and set with reverse rotation of the motor.
4. Once the drive is transmitted to the pressure roller (right), all parts
used to drive the pump begin to act. The Stylus Color 900 has the
right and left pressure rollers. However, since the black and color
heads are included in one unit, the absorption tube is split in the
middle so the 2 pumps can absorb ink in the printhead. See Figure
2-9 which explains the ink absorption process.
5. The cleaner head is located between the pump frame and the
cleaner head drive roller, and a compression spring is set between
the cleaner head and the cleaner drive roller. Since the cleaner
head has a protrusion (marked with a red circle in Figure 2-8) on it
on the roller side, it moves back and forth along with the roller
rotation. However, if the roller rotates faster than the specific level, it
rotates alone because tension of the compression spring does not
work any more.

Operating Principles

S e p a ra to r

C C W

C W

Figure 2-9. Ink Absorption Process

Printer Mechanism Operating Principles

55

EPSON Stylus Color 900

Revision C

2.3 Electrical Circuit Operation Principles

2.3.1 C265 PSB/PSE Power Supply Board

The Stylus Color 900 consists of the following circuit boards:

This section explains the operating principles of the C265 PSB/PSE
board, in order.





C265 main board
C265 PSB/PSE board
C265 Panel Board

AC power supply voltage is supplied from the AC power socket. Then
the fuse (F1) limits the incoming current of the AC voltage to avoid
damaging the C265 main board and C265 PSB/PSE board. On the
other hand, TH1 and TH2 serve to convert surplus input voltage into
heat energy.
The input voltage is next input to the RLC parallel circuit (a filter circuit),
for higher harmonics absorption. This operation keeps the higher
harmonics in the AC power out of the printer, and also prevents leakage
of higher harmonics generated in the printer.
After noise is removed, the AC voltage goes through the full-wave
rectification circuit. The minus component of the alternate wave is
eliminated as the result.
Then the voltage is smoothed by the electrolysis condenser (C11) for
stabilized DC voltage, and the current is applied to the primary side of
the transformer (T1).
The current, however, does not flow into the primary side of the
transformer (T1) if the main switching FET (Q1) located in the primary
side is off. The Q1 comes on when the voltage is applied to the gate
through the R28, a starting resistor, when the printer is turned on. While
the Q1 is on, current does not flow into the secondary side; because a
reverse-characteristics diode is used to connect to the secondary side.
The transformer (T1) is gradually charged with the current. When it is
full and not charged any more, the gate voltage of the Q1 starts going
down gradually. At this point, C13 abruptly pulls in the gate voltage of
the Q1 to turn the Q1 off.

Operating Principles

Electrical Circuit Operation Principles

56

EPSON Stylus Color 900

Revision C

Once the Q1 is off, the energy charged in the primary side flows into the
secondary side all at once. This occurs because the energy transfers in
the same direction as the reverse diode characteristics with the Q1 off.
The secondary side of the transformer (T1), which has the specified
numbers of coiling lines for 42 VDC production, creates the 42 VDC out
of the energy led to the secondary side by the electromagnetic
induction.
The secondary side has numbers of stabilizing circuits to output
stabilized voltages, as listed below:













Smoothing circuit:
Since the energy led from the transformer (T1) to the secondary
side by the electromagnetic induction is alternating current, it
must be smoothed by the electrolysis condensers C51 and C52
to be direct current.
+42 V line constant voltage control circuit:
7 zener diodes (ZD51, ZD81 - ZD86) connected in series
monitors +42 V status used to drive various mechanisms. To
keep the output voltage at a constant levelI, the circuit controls
the on/off timing of the Q1 slightly according to the signals fed
back from the photocoupler (PC1).

+5 VDC by changing output pulses in spite of diverse input
voltage levels. This operation serves as a constant voltage
control circuit.







+5 V line overvoltage protection circuit:
ZD53 in the circuit monitors the +5 V line for overcurrent. In case
the voltage rises to 7 V for reasons such as a defective board,
the circuit shuts the Q1 gate in the same process as the +42 V
line overvoltage protection circuit follows.
Voltage drop delay circuit at power off
The C265 PSB/PSE board uses the secondary switch that
includes the delay circuit. The delay circuit allows the printer to
complete the power off operation properly even though the
printer is turned off while it is printing.
A normal power off operation by the user is monitored by the
C265 main board. When it detects a power off, the program
immediately starts the power-off sequence, capping the
printheads, and drops the power.
The electrolysis condenser (C84) continues to operate to allow
the printer to execute this proper power off sequence.

See the following page for the electrical circuit diagram.

+42 V line overvoltage protection circuit:
This circuit includes 2 zener diodes (ZD52, ZD87) connected in
series. It monitors the +42 V line used to drive various
mechanisms to detect abnormal rise in the voltage level caused
by a defect in the circuit. If the output voltage rises to +48 V, the
signal is input to a port of one of the 2 channels in the
photocoupler (PC1) to completely cut off the Q1 operation. Once
this circuit is active, a normal flow does not recover unless the
printer is turned off and back on.
+5 VDC production circuit:
L4960 (IC51) produces +5 VDC out of +42 VDC. Since the IC
internally operates PWM control, it can always produce constant

Operating Principles

Electrical Circuit Operation Principles

57

EPSON Stylus Color 900

Revision C

In c o m in g c u r r e n t p r o te c tio n
H ig h e r h a r m o n ic s a b s o r p tio n

S m o o th in g

F 1
R 1

N

T H 1 , T H 2

L 1

C 1

C 3 ,C 4

+ 5 V R e g u la to r

T 1

1

O S C

L 4 9 6 0
(IC 5 1 )

H ig h e r h a r m o n ic s a b s o r p tio n
S m o o th in g

L 5 1

7

In

R 2 8
3 0 0 K
S ta r tin g r e s is to r
M a in
S w itc h in g
C 1 3

C

F u ll w a v e r e c tific a tio n

In r u s h c u r r e n t te m p e r a tu r e c o n v e r s io n

Q 1

D B 1

C 2

O u t

L

G L
+ 5 V /1 .5 A
+ 5
P S C
+ 5
+ 5
G L

+

C 5 4

5

S m o o th in g

5 V lin e o v e r v o lta g e p r o te c tio n
G P
+ 4
+ 4
+ 4
+ 4
G P

D 5 1

F e e d
Q 2
b a c k
Q 3

Z D 5 3
C 5 1 ,5 2

Q 3 1

Z D 5 1 ,
Z D 8 1 -8 6

F e e d
b a c k
P C 1

Z D 5 2
Z D 8 7

2 V /0 .8 A
2
2
2

C 8 4
+

C o m e s o n w h e n a b n o r m a l.
P h o to C o u p le r
4 2 V lin e c o n s ta n t v o lta g e c o n tr o l

Q 8 4
V o lta g e d r o p d e la y c ir c u it a t p o w e r o ff

4 2 V lin e o v e r v o lta g e p r o te c tio n

Figure 2-10. C265 PSB/PSE Board Circuit Block Diagram

Operating Principles

Electrical Circuit Operation Principles

58

EPSON Stylus Color 900

Revision C

2.3.2 C265Main Board
See Figure 2-11 for the C265 main board block diagram.

P R O M
(IC 4 )

D -R A M
(IC 5 )

M -R A M
(IC 6 )

E 0 5 B 6 0
(IC 3 )

C N 1 5
S e n s o rs

T im e r
/R S T

C N 2
T y p e B I/F

7 4 L V 1 6 1 2 8 4
(IC 9 )

C N 1
C e n tr o n ic s

C R U 1

H D 6 4 F 2 3 5 7
(IC 1 )

E 0 5 B 5 9
(IC 2 )
T 9 3 C 5 6
(IC 7 )

S N 7 5 L B C
(IC 1 0 )

A 3 9 5 7 (IC 1 3 )

C N 4
U S B
C N 1 3
F A N
C N 1 6
A S F S o le n o id

R T C 9 8 1 0
(IC 8 )

A 3 9 5 7 (IC 1 4 )
Q 7
Q 9

C N 1 2
A S F m o to r

C X A 2 1 2 8 (IC 1 5 )

C N 8
H e a d 1

C X A 2 1 2 8 (IC 1 6 )

C N 9
H e a d 2

C N 3
M a c . S e r ia l

L B 1 8 4 7 (IC 1 1 )

C N 1 0
P F m o to r

L B 1 8 4 7 (IC 1 2 )

C N 1 1
C R m o to r

Figure 2-11. C265 Main Board Block Diagram

Operating Principles

Electrical Circuit Operation Principles

59

EPSON Stylus Color 900

Revision C

The following tables list the major components on the C265 main board
and their functions.
Table 2-14. Major Components on the C265 Main Board (1/2)
Component

Component

Functions

Functions

Motor driver IC
(LB1847: IC11, 12)
(A3957: IC13, 14)

• The LB1847 (IC11 and IC12) is used to drive PF motor
and CR motor and enables 4W1-2 phase excitation
mode for the first in EPSON line. This control system,
called micro stepping, materializes the control of the
carriage vibration during printing and improvement of
accuracy in paper feeding on the hardware basis.
• The A3957 (IC13 and IC14) used to drive Pump, ASF
motor also supports the 4W1-2 phase excitation mode on
the hardware basis, but differs from the former IC in the
point that the IC13 and IC14 individually excite the phase
A and B.

Head driver IC
(CXA2128 x 2: IC15,
16)

• The head driver ICs, directory attached to the board,
consist of two separate circuits; charging circuit and
discharging circuit, to produce trapezoidal waveform.
This IC creates the trapezoidal waveform by combining
the signals input from the input port E05B59 (IC2) of the
IC. This is performed to change the characteristics and
voltage levels of charging and discharging, and the
trapezoidal waveforms specific to normal dot print and
micro dot print are produced as the result.

Electrical Circuit Operation Principles

60

CPU:

• A Hitachi H8-series CPU.
• Performs high-speed data processing running at 24.0
Mhz with an external transmitter.
• Bus width is 16-bit.

ASIC 1:
(E05B60: IC3)

• Controls all interfaces but USB.
• Monitors the signal from each sensor.

ASIC 2:
(E05B59: IC2)

• Controls printheads, motors, ASF solenoid, cooling fan,
USB I/F, and EEPROM.

PROM/MROM:

• For PROM, either one-time PROM or Mask ROM is
used. Specifications vary depending on the
destinations, as shown below:

• PROM size: 16 M bit
• Contents: Unattached
• Bus width: 16 bit

• PROM size: 16 M bit
• Contents: 16 M bit
• Bus width: 16 bit

D-RAM:

• Manages the various buffers and work area.
• Bus width is 16 M bit.

Timer IC:
(RTC9810: IC8)

• Counts total power off time of the printer, which offers
the basis for determining the cleaning type to be
performed at the next power on. Power is supplied by
an external button-cell battery (a lithium battery). This
IC also serves to produce reset signals connecting to
each major IC, such as CPU, ASIC1, ASIC 2, and motor
drive ICs. The head driver ICs (CXA2128 x 2: IC15 and
IC16) individually produce a reset signal when detecting
abnormal voltage so the printhead can stop in the
proper sequence.

Operating Principles

Table 2-15. Major Components on the C265 Main Board (2/2)

EPSON Stylus Color 900

Revision C

The control circuits are explained in detail below.

job properly, the reset signal is once input to the convertor (setting
current production IC) on the main board to stop motors in the correct
sequence.
On the other hand, the timer control is done by counting the operation of
the oscillator circuit, and the printer’s power off time can be confirmed
based on the timer at the next power on operation. Also, this count data
is used to manage the timer for the operation such as periodical flashing
during power on time as well as power off time.
While the printer is on, the printer supplies 5 V (input to Pin 7) to operate
the internal oscillation circuit, however, when the printer is turned off,
the external button-cell battery (a lithium battery) immediately starts
supplying voltage (3 V) to the Pin 8.

[Combined (reset circuit + timer) circuit]
A combined circuit RTC9810 manages both reset signal production and
RTC (Rear Time Controller). It produces reset signals by monitoring the
both 5 VDC line (input to Pin 7) and 42 VDC line (input to Pin 9). When
the voltage level for the 5 VDC line drops to 4.3 V, or the voltage level
for the 42 VDC line drops to 35.5 V, the combined circuit outputs a reset
signal from Pin 2. When the printer is turned on / off or detects abnormal
voltage level, the IC sends the reset signal to the following ICs to avoid
printer damage caused by run-away of the logic line and abnormal
operation of driver systems. Also, to let the motor driver IC execute its
R 1 8 1 0 7 K
+ 4 2 V
D e v is io n

D ro p s to 3 5 V
9

+ 5 V

B A T 1

R 2 0 1 0 K

8

2

/R S T

D /A x y
D /A y x

2 7 2 6

2 5
T C E

3

1 3
8
2
4

1 3

D /A x x

6

E 0 5 B 6 0 (IC 3 )

2

M 6 2 3 8 3 (IC 1 7 )

5

T C L K
T D A T A

/R S T

/R S T

/R S T

E 0 5 B 5 9 (IC 2 )

H D 6 4 F 2 3 5 7 (IC 1 )

1 2

3 6

4 3

8 1

4

C E

G N D

S C L K

V B K

/R S T

3 .0 V
1 4

R T C 9 8 1 0 (IC 8 )
D A T A

S p e e d u p
d io d e

V IN
V D D
7

V R E F 1
V R E F 2
V R E F 1
V R E F 2

L B 1 8 4 7 (IC 1 1 )
3

L B 1 8 4 7 (IC 1 2 )
3

R E F

A 3 9 5 7 (IC 1 3 )

R E F

A 3 9 5 7 (IC 1 4 )

Figure 2-12. Reset/timer combined circuit

Operating Principles

Electrical Circuit Operation Principles

61

EPSON Stylus Color 900

Revision C

[Sensor circuit]

1) Abnormal temperature detection part

The sensors attached to the printer are as described in the following
pages. They are basically divided into 2 major parts: 1) abnormal
temperature detection part and 2) mechanism status detection part. The
former is controlled by the CPU and the latter is controlled by 2 ASICs;
E05B59 (IC2) and E05B60 (IC3).

This abnormal temperature detection part is composed of 3 thermisotrs
and the temperature detection circuit which is included in the nozzle
selector inside the printhead. The CPU’s analog ports used for
temperature detection and their functions are as follows:

P r in th e a d s u r fa c e

T h e r m is to r o n th e h e a t
s in k o n th e m a in b o a r d

R o w A

R o w B

R o w C

R o w D

In s id e th e p r in th e a d
R o w E

L o c a tio n ( T H 1 ) o n th e b o a r d

T H M

C N 8
A N 7
A N 6
A N 5
H D 6 4 F 2 3 5 7 (IC 1 )

1 1 2

1 9

1 1 1

2 1

1 1 0

2 0

H D S A M I

A N 4

1 0 9

A N 3

1 0 8

2

A N 2

1 0 7

9

T H M
1

A N 1
A N 0

1 0 6
1 0 5

1 0

N o z z le
S e le c to r

H P D S A M I
A N O D E 1
A N O D E 2
A N O D E 3
A N O D E 4
4

C N 9
A N O D E 5

Figure 2-13. Sensor Circuit Block Diagram (Abnormal Temperature Detection Circuit)

Operating Principles

Electrical Circuit Operation Principles

62

EPSON Stylus Color 900







Revision C

AN7 (Pin 112)
The TH1, located between 2 pre-driver ICs (the head driver ICs;
IC15 and IC16) on the main board, monitors temperatures around
the board. A Pre-Driver IC is exclusively developed to create
intricate trapezoidal waveforms which vary depending on the model.
It uses +42 VDC and high frequency to produce trapezoidal
waveforms. Therefore, if any relevant trouble has occurred, it is
assumed that the driver is overheated. The TH1 works to detect this
kind of unexpected rise in temperature at an early stage and stop
printing.
AN6 (Pin 111)
Four power transistors (Q3 - Q6) used for trapezoidal waveform
production are directly attached with screws to the large heat sink (a
radiation plate) on the main board. Since the printhead supported by
the Stylus Color 900 supports very high driving frequency (28.8
KHz), higher than ever, and a large amount of PZT, radiation from
the discharging transistor used for trapezoidal waveform production
is huge. Therefore, the cooling fan on the board forces out heat
around the radiation plate. A thermistor fixed on the radiation plate
sends signals to the AN6 port of the CPU to allow the CPU to
manage the cooling fan’s on/off operation.
AN5 (Pin 110)
The electrical signal input to this port is a temperature signal sent
from the thermistor included in the printhead unit. The function of
this thermistor is, same as before, to precisely detect temperatures
around the printhead and feed back information to the C265 main
board. Based on the fed back information, the printer manages
subtle change in the voltage level of the head drive trapezoidal
waveform, and also can eject the correct amount of ink as it is
aimed at any temperature.

Operating Principles



AN4-ANO (Pins 1, 2, 9, 10, 4)
The nozzle selector IC is attached inside the printhead. It
determines which nozzle is used to fire ink according to serial data
sent from the ASIC (IC2). A temperature detection circuit included in
the nozzle selector detects the temperature of each actuator in the
5-row PZT array. This must be performed to avoid false firing. If the
printhead continues the firing motion, but no ink is ejected, the
temperature inside the printhead rises to 100 °C and the printhead
might be damaged as a result. To prevent this from happening, the
abnormal temperature detection circuit is included in the nozzle
selector circuit.
The followings are possible reasons for false firing:
1. If an ink cartridge has been removed before its life end and is
installed again, the ink consumption counter value is upset, and
the counter fails to detect the actual remaining ink level. This
wrong operation dangerously causes the printhead to keep
firing without any ink remaining in the cartridge.
2. Serious dot missing can also cause false firing. In this case,
there is enough ink in the cartridge, but it does not properly flow
into the head because of a clogged nozzle(s). If the PZT is
driven without any ink flow, heat generated by the nozzle
movement can not be released, and this makes the
temperature around the head abnormally high.
3. Strong vertical impact applied to the head causes a
considerable amount of ink around the nozzle to leak all at
once as well as damages meniscus on the head surface. As a
result, ink does not properly eject at the next printing and ends
up in a false firing status.

Electrical Circuit Operation Principles

63

EPSON Stylus Color 900

Revision C

False firing is detected in the following conditions, and the printer
handles it as described below.







False firing detection timing:
If any of the 5 channels, which are monitored by the abnormal
temperature detection circuit in the nozzle selector, reaches 100
°C, the printer stops printing and automaticaly begins the
cleaning cycle. In this case, the printer runs the most powerful
cleaning cycle. The particular address bit called abnormal
temperature detection flag is reset at this point.

the more the cartridge is removed/installed, the more
bubbles are formed, and the printhead can not eject ink
properly and false firing occurs.

Process after detection:
The printer does not resume printing until the temperature
around the PZT recovers to the tolerable range. In case the
printer detects the same abnormal condition again, it indicates
an ink-end error to urge the user to replace the cartridge
considering the following possible reasons:
1. The currently installed ink cartridge is far beyond its useful
life (6 months). Ink, in this condition, does not eject properly
and results in a false firing. When a new cartridge is
installed, the problem is solved.
2. The cartridge installed has been repeatedly removed and
then installed again several times. With this mis-handling of
the cartridge, the ink consumption counter can not properly
describe the actual remaining ink level, and a false firing
occurs as a result. The solution in this case is also replacing
the ink cartridge with a new one.
Furthermore, If an ink cartridge is removed from the printer,
air comes in and bubbles inside the cartridge. Unlike a new
cartridge, the ink inside the removed cartrides is not
deaerated, so the bubbles inside can not be absorbed into
the ink due to the ink’s saturated condition. For this reason,

Operating Principles

Electrical Circuit Operation Principles

64

EPSON Stylus Color 900

Revision C

[Mechanism status detection part]
+ 5
+ 5
E N C B
E N C A

9 3

2 1

9 4

2 0
+ 5

E 0 5 B 5 9 (IC 2 )
C O B
C O C

1 0 9

2 0

1 1 0

2 1

C N 8
L S 1
L S 2
C N 9
C O B
C O C

+ 5

S W C 0
S W A 1

E 0 5 B 6 0 (IC 3 )

S W A 0

C N 1 5

1 3 7

1 6

1 3 6

1 5

1 3 5

1 4

H P
P E
A S F

4

P S C

3 3
C N 5
+ 5

4

P S C

Figure 2-14. Sensor Circuit Block Diagram (Mechanism Status Detection Part)

Operating Principles

Electrical Circuit Operation Principles

65

EPSON Stylus Color 900







Revision C

Encoder:
This sensor increases accuracy of ink ejection timing. Irregular
movement of the carriage, usually caused by a paper jam, can be
also detected based on the change in input signals of this sensor.
Carriage movement is monitored by running the encoder belt (with
lines printed on it with increments of 180 dpi) between the photo
sensor attached to the carriage. Also, if the printer receiveds a large
impact during printing, the input signal cat not be properly read, and
in some cases print quality decreases with a dot missing problem.
This is because this printer forms one dot by producing trapezoidal
head driving waveforms based on the cycle determined by the
signals sent from the encoder.
Ink cartridge sensor:
If the printhead drives without any ink cartridge installed (= false
firing), it damages the printhead unit. Also, compared with other
printers, this printer uses the largest number of PZT and accordingly
releases more heat. For this reason, the ink itself inside the
cartridge serves to lower the temperature inside the cartridge, and
black and color ink cartridges can be separately detected to avoid
false firing.
Detection process: An ink cartridge is detected when the ink
cartridge being installed activates the actuators, which then pushes
the micro switch.
CR home position sensor:
When the printer is turned on, the CRHP sensor confirms the CR is
in the home position during the home position seeking sequence.
Then the printer can determine the CR control afterwards. The
printing column position is also confirmed based on the signals from
the sensor.
Detection process: The carriage is detected when the flag interrupts
the light beam in the photo sensor which is located on the right end
of the printer mechanism.

Operating Principles



PE (Paper End) sensor:
The PE sensor detects the following conditions:












Whether or not paper is set at power on.
Whether or not paper is properly fed from the ASF with the
paper feed command.
Whether or not the printer properly ejects a page of printed
paper after rotating the PF (Paper Feed) motor with the
predefined distance.
Detection method: A photo sensor is used to detect the
actuator’s motion; the actuator is pushed/released by the
leading/rear edge of the paper.

ASF sensor:
Various parts in the ASF are engaged in the phase that is designed
to feed paper at the approariate timing. If the timing is wrong, mismatch occurs between paper feeding by the ASF and paper
transportation for printing, and non-feeding or paper jam will occur.
Therefore, this printer monitors the sensor condition at power on
and before and after paper is fed/ejected according to the pump/
ASF motor’s roational distance.
Power on/off detection:
Unlike primary-side switch type products, ASIC E05B60 (IC3) on the
C265 main board is used to monitor the power on/off operation
instead of any sensor. When the power switch on the control panel
is turned off, the change from 5 V to ground level is detected at the
Pin 33 of the IC3, and the program starts the power off sequence
with this change. Power used during the sequence is supplied by
the electrolysis condenser C84 in the voltage drop delay circuit in
the secondary side of the C265 PSB/PSE board. The electrolysis
condenser continues to supply power until all electric charge inside
is completely discharged.

Electrical Circuit Operation Principles

66

EPSON Stylus Color 900

Revision C

2.3.3 CR Motor Driver Circuit
An exclusive motor drive IC (LB1847: IC12) enables 4W1-2 phase
excitation on the hardware basis. A micro stepping motor is used for the
CR motor to move the carriage accurately and also to improve printing
accuracy by minimizing the motor’s vibration during printing. Figure
2-15 shows the CR motor driver circuit block diagram.
+ 4 2

E 0 5 B 5 9 (IC 2 )
P h a s e A s e ttin g
c u r r e n t s ig n a l
(1 6 p a tte rn s )

C R IA
C R IA
C R IA
C R IA

0
1
2
3

P h a s e B s e ttin g
c u r r e n t s ig n a l
(1 6 p a tte rn s )

C R IB
C R IB
C R IB
C R IB

P h a s e C R A (B )
s e le c tio n s ig n a l

C R P H A A
C R P H A B

P h a s e C R A (B )
E N B ( p e r m is s io n )

s ig n a l

0
1
2
3

C R E N B A
C R E N B B

2 5
2 4
2 3
2 2

1 6 3
1 6 2
1 6 1
1 6 0

1 8

1 9
2 0
2 1

IB 1
IB 2
IB 3
IB 4

1 4 3
1 7 0

2 7
1 6

P H A S E 1
P H A S E 2

1 4 4
1 6 9

2 6

P h a s e A c o n s ta n t
a t c h o p p in g
D E C A Y s ig n a l 1
D E C A Y s ig n a l 2
N o t u s e d

C R C
C R C
C R C
C R C
C R C

IA 1
IA 2
IA 3
IA 4

1 3

T L 0
T L 1
T L 2
T L ‚R
T L ‚S

1 7 1
1 7 2

1 2

1 7 3
1 7 4
5

1 7 5

3
1

N .C .

+ 4 2

1 0

C N 1 1
7
1
6
2

O U T A
O U T -A
O U T B
O U T -B

E N A B L E 1
E N A B L E 2

1 7
2

M D s ig n a l

+ 4 2

L B 1 8 4 7 (IC 1 2 )

1 4 7
1 4 8
1 4 9
1 5 0

M o to r s u b c o n tro l

+ 4 2

V R E F 1
V R E F 2
C R 1
C R 2
M D
D E C A Y 1
S E C A Y 2

O U T A

9

O U T -B
O U T -A
3

O U T B
4

8

+ 4 2

V B B

V C C

G N D

1 4
+ 5
2 8

1 5

M 6 2 3 8 3 (IC 1 7 )
8

D /A x y

Figure 2-15. CR Motor Driver Circuit Block Diagram

Operating Principles

Electrical Circuit Operation Principles

67

EPSON Stylus Color 900

Revision C

Unlike previous EPSON ink jet printers, the number of the phase
excitation input ports in the motor drive IC of this printer has increased
to 8. The previous micro step system used total of 4 phase excitation
input signals for both phases A and B. (Stylus COLOR, Stylus PRO
series, and Stylus PRO XL series are exceptional, since they transfer 4bit serial data from ASIC to the motor driver.) This is because the micro
stepping was controlled by the software only. On the other hand,
LB1847 enables the 4W1-2 phase excitation using the hardware and is
equipped with the necessary number of input ports (8 ports) for current
setting signals. Among these input ports, 4 ports are allocated to each
phase, A and B. Therefore, 16 types of current setting data can be
constantly sent to the driver IC. The LB1847 controls the micro stepping
system by exciting the corresponding phase based on the combinations
of the setting signals sent from the ASIC.
Table 2-16 shows the excitation modes used for the CR motor and their
usage.
Table 2-16. CR Motor Excitation Mode and Usage
Excitation mode

Usage

Minimum step

2-2 phase drive

LQ print mode

1/120" (0.212 mm)

1-2 phase drive

Not used

1/240" (0.106 mm)

W1-2 phase drive

Sort skipping
SLQ print mode

1/480” (0.053 mm)

2W1-2 phase drive

Wiping
Capping

1/960" (0.026 mm)

4W1-2 phase drive

Moving from the
capping position
Uncapping

1/1920" (0.013 mm)

Operating Principles

Electrical Circuit Operation Principles

68

EPSON Stylus Color 900

Revision C

2.3.4 PF Motor Driver Circuit
Motor drive exclusive IC (LB1847: IC11) enables 4W1-2 phase
excitation on the hardware basis. A stepping motor is used for the PF
motor to move the carriage accurately and also to improve printing
accuracy by minimizing the motor’s vibration during printing. Figure
2-16 shows the PF motor driver circuit block diagram.
+ 4 2

E 0 5 B 5 9 (IC 2 )
P h a s e A s e ttin g
c u r r e n t s ig n a l
(1 6 p a tte rn s )

P F IA
P F IA
P F IA
P F IA

0
1
2
3

P h a s e B s e ttin g
c u r r e n t s ig n a l
(1 6 p a tte rn s )

P F IB
P F IB
P F IB
P F IB

P h a s e C R A (B )
s e le c tio n s ig n a l

P F P H A A
P F P H A B

P h a s e C R A (B )
E N B ( p e r m is s io n )

s ig n a l

0
1
2
3

P F E N B A
P F E N B B

M o to r s u b
c o n tro l

IA 1
IA 2
IA 3
IA 4

2 4

2 3
2 2

1 3 3
1 3 4
1 3 5
1 3 6

1 8

1 9
2 0
2 1

IB 1
IB 2
IB 3
IB 4

1 4 2
1 2 8

2 7
1 6

P H A S E 1
P H A S E 2

1 4 1
1 2 9

2 6

E N A B L E 1
E N A B L E 2

1 7
2
1 3

P F C
P F C
P F C
P F C
P F C

T L 0
T L 1
T L 2
T L ‚R
T L ‚S

1 2 4
1 2 7
1 2 5
1 2 6

N .C .

+ 4 2

+ 4 2

L B 1 8 4 7 (IC 1 1 )

2 5

1 4 0
1 3 9
1 3 8
1 3 7

+ 4 2

V R E F 1
V R E F 2

C N 1 0
7
1

O U T A
6

O U T -A
O U T B
O U T -B

P F F A
3

9

P F -A
P F B

2
8
4

P F -B
+ 4 2

V B B

V C C

G N D

1 4

+ 5
2 8

1 5

1 2 3

M 6 2 3 8 3 (IC 1 7 )
3

D /A x x

Figure 2-16. PF Motor Driver Circuit Block Diagram

Operating Principles

Electrical Circuit Operation Principles

69

EPSON Stylus Color 900

Revision C

Unlike the previous EPSON ink jet printers, the number pf the phase
excitation input ports in the motor drive IC of this printer has increased
to 8. The previous micro step system used total of 4 phase excitation
input signals for both Phase A and Phase B. (Stylus COLOR, Stylus
PRO series, and Stylus PRO XL series are exceptional, since they
transfer 4-bit serial data from ASIC to the motor driver.) This is because
the micro stepping was controlled by the software only. On the other
hand, LB1847 enables 4W1-2 phase excitation using the hardware and
is equipped with the necessary number of input ports (8 ports) for
current setting signals. Among 8 input ports, 4 are allocated to each
phase, A and B. Therefore, 16 types of current setting data can be
constantly sent to the driver IC. The LB1847 controls the micro stepping
system by exciting the corresponding phase based on the combinations
of the setting signals sent from the ASIC.
Table 2-17 shows the excitation modes used for the PF motor and their
usage.
Table 2-17. PF Motor Excitation Mode and Usage
Excitation phase

Usage

Minimum step

2-2 phase drive

Not used

1/720"(0.035 mm)

1-2 phase drive

Fast feed 1
Fast feed 2
Special fast feed

1/1440"(0.018 mm)

W1-2 phase drive

Not used

1/2880"(0.009 mm)

2W1-2 phase drive

Middle-speed feed

1/5760"(0.004 mm)

4W1-2 phase drive

Normal feed
Micro adjust feed
Slow feed

1/11520"(0.004 mm)

Operating Principles

Electrical Circuit Operation Principles

70

EPSON Stylus Color 900

Revision C

2.3.5 Pump/ASF Motor Driver Circuit
Like for the CR motor and the PF motor, A3957 (IC13, IC14) enables
the pump/ASF motor to perform 4W1-2 phase excitation on the
hardware basis. Figure 2-17 shows the pump/ASF motor driver circuit
block diagram. Among 2 drivers, IC13 and IC14 drives the Phase A and
Phase B, respectively.

E 0 5 B 5 9 (IC 2 )

+ 4 2

+ 4 2

+ 4 2

+ 4 2

A 3 9 5 7 (IC 1 3 )
P h a s e A s e ttin g
c u r r e n t s ig n a l
(1 6 p a tte rn s )
P h a s e A s p e c ifie d
s ig n a l

P h a s e B s e ttin g
c u r r e n t s ig n a l
(1 6 p a tte rn s )
P h a s e B s p e c ifie d
s ig n a l

A S F
A S F
A S F
A S F
A S F

IA 0
IA 1
IA 2
IA 3
P H A A

6 9

2 0

6 8

1 3
1 1

6 2
6 4
6 3

O U T A
O U T B
8

C N 1 2
1 5
1

A S F A
3

2 2

1 0

A S F -A
2
4

A S F
A S F
A S F
A S F
A S F

IB 0
IB 1
IB 2
IB 3
P H A B

8 1

2 0

8 0

1 3

7 2
7 4
7 3

1 1

A S F B
A S F -B

A 3 9 5 7 (IC 1 4 )
O U T A
O U T B
8

1 5
2 2

1 0

R E F

M 6 2 3 8 3 (IC 1 7 )
4

D /A x y

Figure 2-17. Pump/ASF Motor Driver Circuit Block Diagram

Operating Principles

Electrical Circuit Operation Principles

71

EPSON Stylus Color 900

Revision C

Table 2-18 shows the excitation modes used for the pump/ASF motor
and their usage.
Table 2-18. Pump/ASF Motor Excitation Mode and Usage
Excitation phase

Usage

Minimum step

2-2 phase drive

Fast absorption
Semi-fast absorption
Fast feed

1/720" (0.035 mm)

1-2 phase drive

Micro absorption

1/1440" (0.018 mm)

W1-2 phase drive

Not used

1/2880" (0.009 mm)

2W1-2 phase drive

Normal absorption
Normal feed

1/5760" (0.004 mm)

4W1-2 phase drive

Constant drive
Slow feed
Slow absorption

1/11520" (0.004 mm)

Operating Principles

2.3.6 Printhead Driver Circuit
The printhead driver circuit consists of 2 circuits: the common voltage
production circuit (a trapezoid waveform production circuit) on the C265
main board and nozzle selector on the printhead. The pre-driver
CXA2128 (IC15, 16) produces trapezoid waveform and the transistors
(Q3 - Q6) output it. Unlike previous products, data (serial data) is
independently transferred to each nozzle row to enable reduction in
data latch time required to form one dot, while nozzle selection is
performed by ASIC, which sends serial data directly to the nozzle
selector on the printhead synchronizing with the clock signal. (A block
diagram and the circuit diagram for the nozzle selector are not included
in this manual.) The printhead driver circuit block diagram is shown in
Figure 2-18.

Electrical Circuit Operation Principles

72

EPSON Stylus Color 900

Revision C

2 8
2 7
2 6
2 5
3
4
5

C X A 2 1 2 8 (IC 1 5 )
A 0
A 1

V C C 4 5

A 3

V C C 4 5 _ 2

C L K 1

N P N B

C L K 2

F B

/F L O O R

P N P B

A 2

2 9

D A T A

3 0

D C L K

1

F 1

2 2
2 3

C N 8

2 0

Q 3

1 8

V H V

1 7
5

1 6

C O M a

6

Q 4

C O M c

1 4

E 0 5 B 5 9 (IC 2 )
1 1 0

C O C

1 0 9

C O B

1 0 7

H L A T

1 0 2

H S O C L K

H W A
H W A
H W A
H W A

1 1 0

1 1 4

0
1
2
3

1 1 3
1 1 2
1 1 1

2 8
2 7
2 6
2 5

C X A 2 1 2 8 (IC 1 6 )
A 0
A 1

V C C 4 5

2 2

A 3

V C C 4 5 _ 2

2 3

A 2

H W C L K 1

1 2 0
3

C L K 1

N P N B

2 0

H W C L K 2

1 1 9

4

C L K 2

F B

1 8

H S O _ C

/H W F L R

1 1 8

5

P N P B

1 6

1 0 0

H S O _ B 1

H W S D A T A 1 1 5

2 9

D A T A

1 0 1

H S O _ B 2

H W S L C

1 1 6

3 0

D C L K

1 0 8

H IN V

/H W S L A T

1 2 1

1

9 7
9 8
9 9

H S O _ Y
H S O _ M

/F L O O R

/E

A N 5

A N 0
A N 1
A N 2
A N 3
A N 4

1 0 5

1

1 0 6

2

1 0 7

9

1 0 8
1 0 9

1 0

Q 5

Q 6
C h a r g in g /d is c h a r g in g
c ir c u it fo r c o lo r n o z z le s

C o lo r n o z z le r o w s

C O M d

1 9

C P U (IC 1 )

B la c k n o z z le r o w s

C O M b

1 3

C h a r g in g /d is c h a r g in g
c ir c u it fo r b la c k n o z z le s

/E

+ 4 2

T H M
A N O
A N O
A N O
A N O

4

H e a d te m p e ra tu re
d e te c tio n c ir c u it
D E 1
D E 2
D E 3
D E 4

A N O D E 5

2 1
2 0
1 7
1 5
1 3
1 1
9
7
6
1 9
1

C O C
C O B
L A T
C L K
Y
M
C

B 1

B 2
IN V
C O M e

A N d a ta
(te m p e ra tu re
d e te c tio n
fo r e a c h c o lo r )
I/C d e te c tio n s ig n a l
- D a ta la tc h s ig n a l
- N o z z le s e le c tio n s ig n a l
- C lo c k s ig n a l
T r a p e z o id w a v e fo r m
r e v e r s e s ig n a l
C o lo r n o z z le r o w

C N 9

Figure 2-18. Printhead Driver Circuit Block Diagram

Operating Principles

Electrical Circuit Operation Principles

73

EPSON Stylus Color 900

Revision C

2.3.7 Cooling Fan Driver Circuit

Figure 2-20 shows the main routine of the cooling fan drive.

Since this printer drives a large number of PZT elements (total of 480
nozzles) with a high drive frequency (maximum 32.4 K Hz), heat
radiated around the printheads and the trapezoid waveform production
circuit on the C265 main board is considerably large compared to other
printers. Therefore a thernmistor is attached to the heat sink fixed to
thetrapezoid waveform production transistors to prevent the trapezoid
waveform production transistors (Q3 - Q6) and adjacent HIC from
operating abnormally due to high temperature. When the thermistor
detects abnormally high temperature, the printer turns the cooling fan
on to forcibly blow out heat from the lower case. Figure 2-19 shows the
cooling fan driver circuit block diagram. Table 2-19 shows how the
signals output from the ASIC and corresponding fan conditions.

S ta rt
Is
th e fa n
r o ta tin g ?

t1 = H e a t s in k te m p e r a tu r e o n th e C 2 6 5 m a in b o a r d
t2 = T H 1 te m p e r a tu r e o n th e C 2 6 5 m a in b o r a d .
Y E S

t1 > /=
t2 > /=

o r

5 0 °C

Y E S

5 5 °C

N O

N O

E rro r 1

t1 > /=
t2 > /=

o r

6 0 °C

Y E S

6 0 °C

E rro r 1

N O

+ 4 2

t1 > /=
t2 > /=

6 .8
E 0 5 B 5 9 (IC 2 )

D ro p s to 3 5 V .

F A N

3 9 K

o r

4 0 °C

Y E S

F a n O n

5 0 °C

N O
C N 1 3

F 6
1

1 7 6

2

+ 3 5
G N D
F A N

t1 > /=
t2 > /=

Figure 2-19. Cooling Fan Driver Circuit Block Diagram

o r

3 6 °C
4 2 °C

Y E S

F a n O ff

N O

Table 2-19. Cooling Fan Control by the ASIC (IC2)
ASIC (IC2, 176- pin) condition

Cooling fan condition

High

(5 VDC) On

Low

(0 VDC) Off

R e tu rn to th e S ta rt.

Figure 2-20. Main Routine of the Cooling Fan Drive

Operating Principles

Electrical Circuit Operation Principles

74

EPSON Stylus Color 900

Revision C

Whether or not the cooling fan is driven depends on the electrical
signals sent from the 2 thermistors (“t1” and “t2” in the figure). The “t1”
represents the temperature detected by the thermistor attached to the
heat sink on the C265 main board with a screw, while the “t2”
represents the one between the printhead pre-driver ICs (IC15 and
IC16) on the C265 main board. Table 2-20 shows the thermistor
condition and corresponding fan operation.
Table 2-20. Conditions for Driving the Cooling Fan
Thermistor condition

Cooling fan:
Operating

Cooling fan:
Stops operating.

t1 and t2 have detected
temperatures.

t1 ≥ °40 C or t2 ≥ 50 °C

t1 ≥ °36 C or t2 ≥ 42 °C

Even while the printer is in idle status, the thermistors continue to detect
temperatures every 2 seconds for the cooling fan operation. However, 2
error status conditions can be detected in the main routine, since air
may not cool down if the fan is defective or the ventilation grill is
clogged.

completely. Therefore, this printer specifically shows a fatal error on the
control panel when detecting abnormal temperatures in addition to the
following 2 common conditions.
1. Failure in CR home position detection:
This failure can be caused by one of the following 4 reasons:
- CRHP sensor itself is defective.
- There is a deficiency in the circuit.
- Incorrect PG adjustment
- CR motor is defective
2. Failure in ASF home position detection:
This failure can be caused by one of the following reasons:
- ASF sensor itself is defective.
- There is a deficiency in the circuit.
- ASF is damaged.
- Pump/ASF motor is defective.

[Error 1]
The printer does not stop printing but continues to print by lowering the
drive frequency. For instance, the printer normally prints with the head
drive frequency of 14.4 K Hz to perform 1440-dpi print (horizontal) at
200 cps (CR speed). In the error condition, however, the printer can
lower the head drive frequency to 7.2 K Hz by reducing CR speed to
100 cpi. Note the printer actually performs printing at 1/3 duty / 1-pass
of a normal speed.
[Error 2]
The printer stops printing. In this condition, the temperature at the
junction of the power transistor for trapezoidal waveform production and
the trapezoid waveform production IC (pre-driver) has risen to the limit
(which means the thermistors have detected over 60 °C at both t1 and
t2), and the printer generates a fatal error after stopping printing

Operating Principles

Electrical Circuit Operation Principles

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Revision C

2.3.8 ASF Solenoid Driver Circuit
A planetary gear is used in the gear train which switches between paper
feed operation from the ASF and pump operation. The switching action
is enabled by the solenoid. See Table 2-21 and Figure 2-21 which show
ASF solenoid specifications and the ASF solenoid control circuit block
diagram, respectively.

+ 4 2
F 4

Table 2-21. ASF Solenoid Specifications
No.

Items

Specifications

1

Type

Single-phase DC solenoid

2

Drive voltage

42 VDC ± 5%

3

Coil resistance

588 Ω ± 10% (at 20 °C)

4

Induction

C o o lin g fa n

E 0 5 B 5 9 (IC 2 )

A S F _ S O L

0.98 N (100 gf) or more

Q 9
8 3

Q 8

C N 1 6
2

1

G N D
V B B

Table 2-22 shows the ASIC’s (IC2) conditions for driving the ASF
solenoid.
Table 2-22. Conditions for Driving the ASF Solenoid
ASIC’s (IC2, 83-pin) condition

Solenoid’s condition

High (5 VDC)

Inducting

Low (0 VDC)

Non-inducting

Operating Principles

Figure 2-21. ASF Solenoid Control Circuit Block Diagram

Electrical Circuit Operation Principles

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Revision C

2.3.9 EEPROM Control Driver Circuit
Data for various factory-adjustment items is stored in the EEPROM
(IC7) on the C265 main board. The size of the EEPROM is 2 K bit since
various types of dots are available with this printer and memory
allocated for the ink consumption counter is accordingly large.
When the printer is turned on, data stored in the EEPROM is transferred
to the D-RAM by the ASIC (IC3). In the D-RAM, the ASIC controls
various adjustment values, total ink consumption, and current ink usage
condition for each color, and the printer prints depending on these
values. When the printer is turned off, the data and adjustment values
accumulated and controlled in the D-RAM are written back into the
specific addresses in the EEPROM under the ASIC’s control.
Information is transmitted between the ASIC (IC3) and the EEPROM in
the serial data format.
+ 5

E 0 5 A 6 0 (IC 3 )

A T 9 3 C 5 6 (IC 7 )
8

V c c
6

5

1

2 9
2

3 0
3

3 1

C S

O R G
G N D

S K
D I
D O

4

3 2

D R A M (IC 5 )

E C S
E S K
E D I

A d d re s s
D a ta

E D O

Figure 2-22. EEPROM Control Circuit Block Diagram

Operating Principles

Electrical Circuit Operation Principles

77






TROUBLESHOOTING

EPSON Stylus Color 900

Revision C

3.1 Overview
This chapter describes how to troubleshoot problems. It consists of the
sections shown in the flowchart below. When identifying and
troubleshooting problems, be sure to proceed to the correct section
specified in the flowchart.

N o

Is o
o n
b o
(S

la tin g th e fa u lty p a r t
th e p o w e r s u p p ly
a rd
e c tio n 3 .1 .2 )

Following sections show detailed information on each step in the
flowchart. Be sure to perform troubleshooting without neglecting the
correct order specified in each section.

Is th e p r in te r p o w e r o n ?

Y e s
T r o u b le s h o o tin g w ith
L E D e r r o r in d ic a tio n s
( S e c tio n 3 .1 .1 )

Is o la tin g th e fa
a c c o r d in g to th
e x h ib ite d p h e n
( S e c tio n 3 .1 .3

u lty p a r t
e
o m e n o n s
)

Figure 3-1. Troubleshooting Flowchart

Troubleshooting

Overview

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Revision C

3.1.1 Troubleshooting with LED Error Indications
This section describes how to troubleshoot the problem when the
printer indicates an error at power on and can not print. The Stylus
Color can detect the following six errors and indicates them with the
LEDs, as shown below.

See the following tables which show the error conditions and
corresponding possible causes.
Table 3-2. Error Condition and the Possible Causes
No.
1

Table 3-1. Error Indication with the LEDs

Error Condition
Paper Out Error
(Refer to Section
3.1.1.1.)

Corresponding Combination of the LED Condition
Error Condition

Possible Causes
1. Failure in paper feeding
2. Connector for the PE sensor is disconnected.
3. The PE sensor actuator is acting improperly.
The sensor base is not fixed properly.
4. The PE sensor is defective.

Power

Ink Out
(Black)

Ink Out
(Color)

Paper Out

Paper Out Error

On

---

---

On

Paper Jam Error

---

Off

Off

Blink

No I/C or Ink Out
(Black) Error

---

On

---

---

No I/C or Ink Out
(Color) Error

---

---

On

---

Maintenance
Error

Blink

Blink

Blink

Blink

5. The PE sensor actuator is not acting properly.
The sensor base is not fixed properly.

Fatal Error

Blink

On

On

Blink

6. The PE sensor is defective.
The encoder is defective.

5. ASF is damaged.
2

1. The paper in use is longer than specified.
2. The encoder at the back of the carriage is covered
with dust.
3. The encoder at the back of the carriage is almost
dislocated. If it has completely come off, a fatal error
occurs.
4. The PE sensor remains on because it is covered
with paper debris or dust.

7. The ASF is not installed properly.
The paper load sub roller is not fixed properly.

NOTE: “---” means the LED is not affected by the error condition.

Troubleshooting

Paper Jam Error
(Refer to Section
3.1.1.2.)

Overview

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Revision C

Table 3-3. Error Condition and the Possible Causes (continued)
No.

Error Condition

3

NO I/C or Ink Out
Error
(Refer to Section
3.1.1.3.)

Possible Causes

3.1.1.1 Remedies for Paper Out Error
This section provides check points and corresponding actions which are
necessary when the Paper Out Error problem has occurred because of
either of the following reasons:

 Paper is set in the ASF hopper but not fed.

 Paper is fed but not detected by the printer.

1. The counter is not showing the actual remaining ink
level.
2. Ink cartridge sensor actuator is not acting properly.
3. The micro switch is not mounted correctly.
The connector (green) is disconnected.
4. The connector (green, 3-pin) on the small board
directly attached to the printhead surface side is
disconnected. Note the connector (green, 4-pin) is
irrelevant as it is for the encoder.

Be sure to follow the steps in the order described in the tables.

NOTE: If the finding for the question is Yes, take the action described in
the right column. If “No”, proceed to the next step.

5. The micro switch is defective.
6. The value for the ink consumption counter in the
EEPROM is destroyed.
7. Ink cartridge replace command is generated because
an abnormal temperature is detected.
4

Maintenance
Error
(Refer to Section
3.1.1.4.)

Usual waste ink over-flow is requested.
Note this error can be cleared by the special function
through the control panel operation only.

5

Fatal Error
(Refer to Section
3.1.1.5.)

1. The CRHP sensor has come off.
The connector for the CRHP sensor is disconnected.
2. The encoder belt has come off.
The encoder belt is not placed through the encoder
located at the back of the carriage.
3. The ASF sensor has come off.
The connector for the ASF sensor is disconnected.
4. The coil for the CR motor has burnt.
5. The coil for the PF motor has burnt.
6. The lever fixing the planetary gear has come of the
frame.
The tension spring is dislocated.
7. Coil for the pump/ASF motor has burnt.
8. The coil for the ASF solenoid has burnt.
9. The CRHP sensor is defective.
10. The ASF sensor is defective.

Troubleshooting

Overview

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Revision C

Table 3-4. Remedies for Paper Out Error
Step
1

Check point
Is no paper
loaded?

Table 3-5. Remedies for Paper Out Error (continued)

Actions

Step

Set a cleaning sheet in the ASF up side down. Then
holding the top edge, press the Load/Eject button, and
the micro pearl on the paper load roller (a semicircular
roller) surface is removed. To remove severe smear,
staple a cloth moistened with alcohol to a post card and
clean the roller in the same manner.

N o n - a d h e s iv e A r e a

4

Check point
Is The PE sensor
defective?

M /C

B o tto m

v ie w o f th e p r in te r m e c h a n is m

M /C

Troubleshooting

B L K

Connect the connector (yellow, 3-pin) for the PE sensor.

C o n n e c to r fo r th e
P E s e n s o r

• Is the PE
sensor
actuator acting
improperly?
• Is the sensor
base floating?

M /C

P in 2 (G N D )

5

3

W H T

R E D

C lo th m o is te n e d
w ith a lc o h o l

A S F

Is the connector
for the PE sensor
disconnected?

S ta p le r s

P E

2

P in 3 (P E )
C R H

T h is s id e d o w n

Measure the voltage at the yellow 3-pin connector
on the relay board by activating the actuator
manually to check that the voltage is correct as
follows.
The actuator is activated: 2.4 V or more
The actuator is released: 0.7 V or less

(U s e a p o s t c a rd
fo r th e b a s e s h e e t.)

C L S h e e t
A d h e s iv e A r e a

Actions

T e n s io n s p r in g

• Using your hand, try activating the actuator in the
same condition as it is detecting incoming paper. Then
release the actuator and check if the actuator
automatically returns to its original position with the
tension of the spring.
• Referring to the illustration above, check that the
sensor base is securely installed to the frame. If the
sensor base is floating or installed insecurely, instal it
securely.

Overview

Is the ASF damaged?

Hand-rotate the shaft in the ASF in the paper feed
direction and check if the hopper hops out every
time you rotate the shaft.

NOTE: Even though the ASF sensor is in the
proper condition for detecting the HP
sensor, If the hopper is not operating at the
correct timing for paper feeding, paper is
not loaded. Therefore, if the ASF sensor is
working without this correct combination,
reassembly or replace the ASF.

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Revision C

3.1.1.2 Remedies for the Paper Jam Error

Table 3-6. Remedies for Paper Jam Error

This section includes the check points and corresponding actions which
are necessary when the Paper Jam Error constantly occurs when the
printer is turned on or feeding paper.

Step

Be sure to follow the steps in the order described in the tables.

Check Points

Actions

1

Is the paper length
beyond the
specifications?

Instruct the user that the Paper Jam Error occurs
if paper whose length is beyond the specifications
is used.

2

Is the encoder located
at the back of the CR
covered with dust?

Check if there is any dust or paper debris lodged
between the parts of the encoder (a transmission
type photo sensor) located at the back of the
carriage.

NOTE: If the finding for the question is Yes, take the action described in
the right column. If “No”, proceed to the next step.

L in e a r S c a le
( E n c o d e r b e lt)

E n c o d e r
C a r r ia g e U n it

3

Is the encoder belt
nearly dislocated from
the encoder?

Referring to the illustration above, check if the
encoder belt is nearly dislocated from the
encoder.

4

Is the PE sensor always
on because of the paper
debris or dust
accumulated over the
sensor.

Viewing the PE sensor from the front, check that
the actuator is the correct position: the actuator
falls in the cutout without any paper.

P E S e n s o r
A c tu a to r

P E P a p e r G u id e
A s s e m b ly ( R ig h t)

Troubleshooting

Overview

P F R o lle r

83

EPSON Stylus Color 900

Revision C

Table 3-7. Remedies for Paper Jam Error (continued)
Step
5

6

Check Points

Table 3-8. Remedies for Paper Jam Error (continued)

Actions

• Is the PE sensor
actuator acting
improperly?
• Is the sensor base
floating?

Referring to Step 3 in Section 3.1.1.1 “Remedies
for Paper Out Error”, check the sensor condition.

• Is the PE sensor
defective?
• Is the encoder
defective?

Referring to Step 4 in Section 3.1.1.1 “Remedies
for Paper Out Error”, check the sensor condition.
Then, verify the encoder sensor condition by
checking the following points for proper connection
and electrical continuity, since checking the signal
directly from the encoder is impossible.
1. Connection of the connector 1
2. Connection of the connector 2
3. Electrical continuity of the cable.
C a r r ia g e v ie w e d fr o m

Step

Check Points

7

Is the ASF installed
improperly?
Is any of the paper load
sub rollers fixed
improperly?

th e b a c k
H e a d s u rfa c e

Actions
• Check the ASF installation at the following 2
points: View A and View B in the figure below.
V ie w B

V ie w A

P r o tr u s io n is s e t in h e r e .

V ie w B
D is c o n n e c te d

C o n n e c to r 1

C h e c k fo r
c o n tin u ity .
C o n n e c to r 2

V ie w

A

• Viewing the printer from the back, check that all
of the six torsion springs securing the paper
load sub rollers are properly installed.
T o p F ra m e

Troubleshooting

Overview

T e n s io n S p r in g

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Revision C

3.1.1.3 Remedies for No I/C and Ink Out Errors

Table 3-9. Remedies for No I/C and Ink Out Errors

This section includes the check points and corresponding actions which
are necessary when the black ink (or color ink) LED comes on or blinks
at power on despite the ink cartridge has been replaced with a new one.
Be sure to follow the steps in the order described in the tables.

Step
1

Check Point

Actions

Does the counter
value mis-match the
actual remaining ink
level?

The ink consumption counter, separately set for black
and color ink, adds up points according to ink weight
used to form one dot. This counter is reset (the value
returns to zero) when the I/C replacement sequence is
performed. If the counter is reset for any other
purposes, the following adversities will occur.

NOTE: If the finding for the question is Yes, take the action described in
the right column. If “No”, proceed to the next step.

1. Enough ink is remaining in the cartridge, but the
printer shows the Ink low or Ink end condition and
can not continue to print.
2. Ink has run out but the printer continues to print and
starts false firing, which damages the printhead.
Explain the situation to the user well, and replace the
I/C with a new one.
2

Is the ink cartridge
sensor actuator
acting improperly?

Turn the both actuators (eight and left) manually and
check that they properly push the micro switches.
Then, also check that the actuators return to their
normal conditions shown in the figure below
automatically.
M ic r o S w itc h e s

A c tu a to r 1

Troubleshooting

Overview

A c tu a to r 2

85

EPSON Stylus Color 900

Revision C

Table 3-10. Remedies for No I/C and Ink Out Errors (continued)

Table 3-11. Remedies for No I/C and Ink Out Errors (continued)

Step

Actions

Step

Check Point

Actions

If the micro switch is not properly attached, the
actuators possibly fail to touch the micro switch.
Therefore, check that the micro switch is
securely attached to the carriage by the hooks.

6

Is data in the EEPROM
destroyed?

If the address for the ink consumption information
in the EEPROM is garbled and the printer shows
the Ink Out (Ink End) error constantly, the printer
sets the interface signal “BUSY” to High and stops
communication with any other peripheral devices.
Therefore, it is effective to replace the I/C with a
new one to forcibly overwrite the address with 00H.

7

Is the abnormal
temperature detection
circuit working?

Since the Stylus Color 900 drives a large number
of PZT with a high drive frequency, if the printhead
is driven without any ink filled in it, the printhead
abnormally heats up and may be damaged as the
result. Therefore, this printer monitors and controls
the temperature around the printhead more strictly
than any other printers do. In case the printer
detects abnormal rise in head temperature during
printing, it generates the I/C replacement
command after the sequence described below.
1. Detects an abnormal temperature during
printing.
2. Stops printing and begins a head cleaning. (This
operation solves the nozzle clogging problem in
most cases.)
3. Resumes printing.
4. If detects an abnormal rise in the head
temperature again, sets a flag and generates
the I/C replacement command. (The Ink LED
comes on.)
The printer mostly enters this sequence under the
following two conditions:
• Ink around the nozzles is severely viscous. (due
to removal and reinstallation of the I/C)
• Ink is leaking from the printhead because of a
large impact.
The temperature in the printhead actually rises
abnormally when half the nozzles in any nozzle
row are clogged, or 48 nozzles in any 96-nozzle
row are clogged.

3

Check Point
Is the micro switch fixed
improperly?
Is the connector (green)
disconnected?

C o n n e c to r

M ic r o S w itc h e s

H o o k s

4

Is the connector (green,
3-pin) disconnected form
the small board which is
directly attached to the
head surface side?

Remove the printhead and check if the connector
(green, 3-pin) is disconnected from the small
board at the bottom of the printhead.
Note: The green 4-pin is irrelevant as it is for the
encoder.

5

Is the micro switch
defective?

1. Keeping the left micro switch pressed down,
place the probes of the tester to the middle
and left pins to check for electrical continuity.
2. Keeping the right micro switch pressed down,
place the probes of the tester to the middle
and right pins to check for electrical continuity.
S te p 1

P u s h 1

Troubleshooting

S te p 2

P u s h 2

Overview

86

EPSON Stylus Color 900

Revision C

3.1.1.4 Remedies for the Maintenance Error
While the printer is in this error condition, it disables all operations
including data communication except for the panel operation specified
to clear the error. Therefore, follow the steps described in Table 3-12 to
solve the problem.
Table 3-12. Remedies for the Maintenance Error
Step

Actions

Correct LED condition

1

Turn the printer on while pressing the
Load/Eject and the Cleaning buttons, and
the Paper Out LED starts blinking. (Blinks
for three seconds.)

The Paper Out LED is blinking.

2

While the Paper Out LED is blinking (for
three seconds), press the Cleaning button
for ten seconds.

The following three red LEDs
are blinking: Ink Out LED
(Black), Ink Out LED (Color),
and Paper Out LED.

NOTE: During the Step 2, if the Load/Eject button is pressed, the
Maintenance Error is not cleared but the EEPROM initialization
mode is activated instead. The EEPROM initialization can be
used to recover from conditions such as the printer does not
accept any data from the PC. The EEPROM initialization mode
initializes the following items:






Accumulated power-off time:The value for the Timer IC is reset.
CL Timer:

The CL timer, which is also called firewaiting timer, secures the printer
specific period of time so bubbles
formed around the printhead during a
cleaning vanish.

I/F selection:

Selects “Auto”, the factory default,
from 4 I/F selection items: Auto,
Parallel, Serial, and Option.

Troubleshooting

Overview

87

EPSON Stylus Color 900

Revision C

3.1.1.5 Remedies for Fatal Error

Table 3-14. Remedies for Fatal Error
Step

Check Point

3

Has the ASF sensor
come off?
Is the sensor for the
ASF disconnected?

1. The printer does not detect the carriage in the home position.
2. The printer does not detect signals from the linear scale.
3. The ASF sensor does not detect the ASF home position.

Actions
Referring to the figure below, check that the ASF
sensor is attached to the correct position.
Check that both connectors 1 and 2 are securely
connected.
A S F S e n s o r

The following tables show various causes of the error and
corresponding solutions. Be sure to follow the steps correctly to solve
the problems.

A S F F ra m e
(L e ft)

NOTE: If the finding for the question is Yes, take the action described in
the right column. If “No”, proceed to the next step.

C o n n e c to r 2

Actions

W H T
M /C
B L K

Check the CRHP sensor visually. Connect the
connector properly. Make sure the connector is
connected to the indicated position on the relay
board. Also, check that there is no dust nor paper
debris between the sensor parts.

4

Has the coil for the
CR motor burnt?

C o n n e c to r 1
C o n n e c to r 2

M e c h a n is m
F ra m e

M /C

Has the CRHP
sensor come off the
printer mechanism
frame?
Is the connector for
the CRHP sensor
disconnected?

A S F

1

Check Point

R E D

Step

P E

Table 3-13. Remedies for Fatal Error

C R H

M /C

P E

A S F

R E D

Since the CR motor is controlled by the Bipolar
system, measure the coil resistance using the tester
as shown below.

Note: Be
S te p 1
sure to
measure the
resistance at
T o P in 3
T o P in 1
two points
shown in the
T o P in 2
figure below.
S te p 2

W H T
M /C

M /C

C R

B L K

2

Has the encoder belt
come off?

Troubleshooting

M /C

C o n n e c to r 1

C R H

A fatal error is basically caused by any of the following conditions:

Referring to step 2 in Section 3.1.2.2, check that the
encoder belt is set between the sensor parts. Also
check that the sensor is free from dust and paper
debris.

Overview

5

Has the coil for the
PF motor burnt?

M o to r

T o P in 4

Measure the internal coil resistance of the PF motor
in the same manner as for the CR motor.


88

EPSON Stylus Color 900

Revision C

Table 3-15. Remedies for Fatal Error (continued)
Step

Check Point

6

Is the lever
securing the
planetary gear
dislocated from
the frame?
Has the tension
spring come off?

Table 3-16. Remedies for Fatal Error (continued)

Actions
Check if the two
hooks securing
the planetary gear
fixing lever to the
Pump/ASF switch
mechanism are
released from the
frame.
Also, check the
tension spring’s
condition.

Step
9

< P u m p /A S F S w itc h in g M e c h a n is m >

Check Point
Is the CRHP sensor
defective?

P u m p /A S F M o to r
L e v e r F ix in g th e
P la n e ta r y G e a r

Actions
Check for the correct voltages at 3-pin connector
shown in the figure below.
Turn the printer on and check the voltage is correct
as follows:
• When the CR has come in the home position, the
voltage rises to 2.4 VDC or higher.
• When the CR has left the home position, the
voltage drops to 0.7 VDC or lower.

Ir o n C o r e in
th e S o le n o id

M /C

Referring to the figure below, measure the coil
resistance of the solenoid coil using a tester. Note the
tester can be used regardless of the polarity.


B L K

Is the coil for the
ASF solenoid
burnt?

M /C

8

A S F

Measure the internal coil resistance of the pump/ASF
motor in the same manner as for the CR motor (Step 4).


P E

Has the coil for
the Pump/ASF
motor burnt?

C R H

7

T o P in 3
(C R H P )

W H T

R E D

T e n s io n S p r in g

10

Is the ASF sensor
defective?

M /C

T o P in 2 ( G N D )

Check for the proper voltage in the same manner as
described in the previous step. The ASF connector
(3-pin) location on the relay board is also shown in
the figure above. The pin configuration is also the
same as CRHP sensor.
At power on, the ASF reset operation is performed,
and the ASF Sensor detects ASF home position.

S o le n o id

Troubleshooting

Overview

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Revision C

3.1.2 Isolating the Faulty Part on the Power Supply Board
This section explains how to troubleshoot the following problems:




Table 3-18.
Isolating the Faulty Part on the Power Supply Board (continued)

The printer is turned on, but the initialization is not performed and
LED on the control panel do not come on.

Step

Problems after power on

Be sure to perform troubleshooting in the order specified, because the
parts involved are mentioned in the disassembly procedure to facilitate
servicing.

Check Point

Action

6

Is CN 5 or CN6 on the
main board
disconnected?

Check that the connectors CN5 and CN6, which
are used to input power from the power supply
board, are properly connected.

7

Is the choke coil
broken?

Viewing the reverse side of the power supply
board, check for the proper continuity at the two
points indicated in the figure below.

Table 3-17. Isolating the Faulty Part on the Power Supply Board
Step

Check Point

Action

1

Is the panel FFC
disconnected from the
connector on the panel
board?

The power switch for this printer is in the secondary
side. Therefore, if the FFC does not transfer
signals, the printer does not operate despite the
power supply board and the main board are
properly connected.

2

Is the panel FFC
disconnected from the
connector (black, 12pin) on the relay board?

This printer uses the power switch on the
secondary side. Therefore, if the FFC does not
transfer signals, the printer does not operate
despite the power supply board and the main board
are properly connected.

3

Is the connector
disconnected from the
CN15 on the main
board?

The reason is the same as above.
The panel control FFCs are connected via 1) CN15
on the main board → 2) Relay board → 3) Control
Panel.

4

Has the fuse (F1) on
the power supply board
blown?

Check if the line in the F1 located beside the CN1
on the power supply board has blown.

5

Is CN2 or CN3 on the
power supply board
disconnected?

Check that the connectors CN2 and CN3, which
are used to apply power to the main board, are
properly connected.

L 1 ( r e v e r s e s id e )

C N 1 s id e

8

Is the transformer (T1)
broken?

C N 2 s id e

Referring to the figure below, check if the
transformer is disconnected between the poles. Try
every combination in each group marked with a
blue box.

T 1
( r e v e r s e s id e )

C N 5 S id e

Troubleshooting

Overview

C N 3 S id e

90

EPSON Stylus Color 900

Revision C

Table 3-19.
Isolating the Faulty Part on the Power Supply Board (continued)
Step
9

Check Point
Is the main switching
FET (Q1) defective?

Table 3-20.
Isolating the Faulty Part on the Power Supply Board (continued)

Action

Step

Check Point

Action

Check the electrical continuity of the switching
FET by trying four patterns below. Be sure to pay
attention to the polarity. If the main switching FET
is good, the findings should be as shown under the
figure.

11

Is the PNP connection
transistor defective?

Check the PNP connection transistor on the C265
PSB/SE board in the same manner described in
the previous step.

S te p .1
G

D

S te p .2
G

S

+
+

B

Is the NPN connection
transistor defective?

+

12

Is the +5 V regulator
(IC51) defective?

Check the IC51 for the oscillation waveform
(measured by using a oscillo scope) output from
the Pin 5. If the output waveform is as shown
below, it means the IC51 is working properly.

G N D

IC 5 1
B

B
C

-

+

E
C

+

O s c illa tio n w a v e fo r m

-

S te p .3

S te p .4

B

5 - p in ( O S C )
B

+
E
C

-

E
C

S te p .2

N P N T r

E

C

Step 1: Off, Step 2: On, Step 3: Off, Step 4: On

Check the electrical continuity of the NPN
connection transistor on the C265 PSB/SE board
by trying four patterns below. Be sure to pay
attention to the polarity. If the NPN contact
transistor is good, the findings should be as shown
under the figure. Note the NPN connection
transistor is shown in the circuit diagram as
described below.
S te p .1

-

B
E

-

D

E

S te p .4

C

Step 1: Off, Step 2: On, Step 3: Off, Step 4: Off
10

+
+

+

+
D

B
C

E

S te p .3

-

G

-

S te p .2

P N P T r
E
B

C
-

S te p .4

G

-

B

S
D

S te p .3

+

S te p .1

E
C
+

Step 1: On, Step 2: Off, Step 3: Off, Step 4: On

Troubleshooting

Overview

91

EPSON Stylus Color 900

Revision C

3.1.3 Isolating the Faulty Part according to the Phenomenon
Refer to this section if you could not solve the problem in Section 3.1.1
or Section 3.1.2 or need more information to isolate the cause
according to the exhibited phenomenon. The contents mostly cover the
problems relating to the C265 Main board and their remedies.

Table 3-22. Cooling Fan does not Rotate
Step

Check Point

1

Is the fuse (F6)
open?

Place the probes of the tester on the both terminals of
the chip fuse (F6) on the C265 Main board. Then
check for electrical continuity. F6 is located beside the
Q7 which is in front of the cooling fan connector
(CN13).

2

Is the transistor
(Q7) defective?

Q7 is beside the connector (CN13 for the cooling fan).
Since the three terminals for the base, emittor, and
collector are not marked, try every pattern below to
check for electrical continuity. Be sure to test with the
correct polarity. The correct findings are shown under
the figure.

Table 3-21. Phenomena Exhibited
No.

Phenomenon Exhibited

Table to refer to

1

The cooling fan does not rotate.
Note the cooling fan does not constantly rotate.
Refer to Chapter 2 / Section 2.3.7.

Table 3-22,

2

CR motor does not rotate.

Table 3-23

3

PF motor does not rotate.

Table 3-24

4

pump/ASF motor does not rotate.

Table 3-25, Table 3-26

5

ASF solenoid does not operate.

Table 3-27, Table 3-28

6

Cleaning does not solve the print problem.

Table 3-29 - Table 3-33

7

Ink End Error occurs after the printhead is
replaced, so the printhead can not be adjusted.

Table 3-34

Action

S te p 2

S te p 1

S o ld e r e d
a re a
-

+
+

S te p 3

-

+
-

+

S te p 4

-

Step 1: On, Step 2: Off, Step 3: On, Step 4: Off

Troubleshooting

Overview

3

Is the internal coil
for the fan motor
open?

Replace the Fan unit and then check for the correct
operation.

4

Is the C265 Main
board defective?

If the cause has not been isolated yet, replace the
C265 Main board.

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Revision C

1

Check Point
Getting ready
for inspecting
waveforms.

Action

Step

The connector used to control the CR motor is indicated
in the figure below. Using the oscillo scope, check for the
waveform for each phase at the indicated connector.
To check the waveform, press the Load/Eject button to
attempt to move the carriage. Be sure to leave the cable
for the CR motor connected.

1

Check Point
Getting ready
for inspecting
waveforms.

Action
The connector used to control the PF motor is indicated
in the figure below. Using the oscillo scope, check for the
waveform for each phase output from the indicated
connector. To check the waveform, press the Load/Eject
button to attempt the ASF paper feeding. Be sure to
leave the cable for the PF motor connected.
M /C

P h a s e A , P h a s e B , P h a s e /A , a n d
P h a s e /B fr o m th e P in 1 m a r k .

P E

Step

Table 3-24. PF Motor does not Operate

C R H

Table 3-23. CR Motor does not Operate

A S F

R E D

C R H

M /C

W H T

P E

A S F

R E D

M /C
B L K

W H T
M /C

M /C
B L K

NOTE: The GND can be output by placing the probe of
the oscillo scope to the tapped hole in the
bottom plate on the board with a screw. Note
the connector has no ground line since this
printer drives the motor with the bipolar system.

NOTE: The GND can be output by placing the probe of
the oscillo scope to the tapped hole in the
bottom plate on the board with a screw. Note
the connector has no ground line since this
printer drives the motor with the bipolar system.
2

Check of the
waveform and
remedies

2

While trying to drive
the CR motor, the
2 0 V 2 0 µ
waveform output
from each phase
should be as shown
in the figure. If the
waveform output
from each phase is
as shown below,
replace the CR
motor. If not,
replace the IC12 (CR motor driver IC) or C265 Main
board.

NOTE: The GND can be output by placing the probe of
the oscillo scope to the tapped hole in the
bottom plate on the board with a screw.

Troubleshooting

M /C

P h a s e A , P h a s e B , P h a s e /A , P h a s e /B
fr o m th e P in 1 m a r k

Overview

Check of the
waveform and
remedies.

While trying to drive
the PF motor, the
2 0 V 2 0 µ
waveform output from
each phase should be
as shown in the
figure. If the
waveform output from
each phase is as
shown in the figure,
replace the PF motor.
If not, replace the
IC11 (PF motor driver IC) or C265 Main board.

NOTE: The GND can be output by placing the probe of
the oscillo scope to the tapped hole in the
bottom plate on the board with a screw.

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Revision C

Table 3-25. Pump/ASF Motor does not Operate
Getting ready for
inspecting
waveforms.

Action

Step

The connector used to control the Pump/ASF motor
is indicated in the figure below. Using the oscillo
scope, check the waveform for each phase output
from the indicated connector. To check the
waveform, press the Load/Eject button to attempt
the ASF paper feeding. Be sure to leave the cable
for the Pump/ASF motor connected.

2

Check Point
Check of the
waveform and
remedies.

Action
While trying to drive the Pump/ASF motor, the
waveform output from each phase should be as
shown below. If the waveforms output from each
phase are as shown below, replace the Pump/ASF
motor. If not, replace the IC13 (Pump/ASF motor
driver IC) or C265 Main board.
2 0 V

2 0 µ

2 0 V

2 0 µ

M /C

P E

1

Check Point

C R H

Step

Table 3-26. Pump/ASF Motor does not Operate (continued)

A S F

R E D
W H T
M /C

M /C
B L K

P h a s e A , P h a s e B , P h a s e /A , P h a s e /B
fr o m th e P in 1 m a r k

NOTE: The GND can be output by placing the
probe of the oscillo scope to the tapped
hole in the bottom plate on the board with a
screw. Note the connector has no ground
line since this printer drives the motor with
the bipolar system.

NOTE: The GND can be output by placing the
probe of the oscillo scope to the tapped
hole in the bottom plate on the board with a
screw.

Troubleshooting

Overview

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EPSON Stylus Color 900

Revision C

Table 3-27. ASF Solenoid does not Operate

Table 3-28. ASF Solenoid does not Operate (continued)

Step

Check Point

Action

1

Is the fuse (F4)
open?

Place the probes of the tester on the both terminals of
the chip fuse on the C265 Main board, then check for
electrical continuity. The F4 is located between CN12
and CN16 and also beside the Q9.

2

Is the transistor
(Q8) defective?

Place the probe of the oscillo scope on the collector side
of the transistor Q8 on the C265 Main board, then check
that 40 VDC is constantly applied. Then press the Load/
Eject button and check if the voltage drops to 0 VDC for
an instant. If it does, it means the Q8 is working properly.
The Q8 is located between CN12 and CN16.

Step

Check Point

Action

3

Is the transistor
(Q9) defective?

Place the probe of the oscillo scope on the emittor side of
the transistor Q9 on the C265 Main board, then check
that voltage is always 0 VDC. Then press the Load/Eject
button and check for an instant change in voltage level
from 0 to 40 VDC. if it changes correctly as described
above, it means the Q9 is working properly. The Q9 is
located beside the CN16.

+

Q 9

Q 8

2 0 V

2 0 V

2 0 µ

2 0 V

2 0 µ

2 0 µ

2 0 µ

4

Troubleshooting

2 0 V

Overview

Is the C265
Main board
defective?

If the cause has not been isolated yet in the previous
steps, replace the C265 Main board.

95

EPSON Stylus Color 900

Revision C

Table 3-29. Cleaning does not Solve the Print Problem

Table 3-30. Cleaning does not Solve the Print Problem (continued)

Step

Check Point

Action

Step

1

Repeat the cleaning
7 or 8 times.

Unlike the previous products, the Stylus Color 900
is not equipped with the CL3 (dummy cleaning).
Therefore, you can repeat the cleaning every time
you press the Cleaning button without running a
self-test nor any printing.

4

2

Trying the initial ink
charge operation.

You can repeat the initial ink charge operation in
the way described below:
1. Using the exclusive program, reset the initial ink
charge flag in the EEPROM.
2. Turn the printer back on. (Refer to Chapter 5 for
details.)

3

Reinstalling the
printhead FFC.

Remove the upper case and check if the FFCs are
properly connected to the CN8 and CN9 on the
C265 Main board. Even though they are not
installed aslant as shown below, disconnect the
FFC once and connect them again, then run a print
check.

Check Point
Check the cap for any
foreign matter, dirt, or
damage.

D a m a g e d a re a
o n th e ru b b e r

R u b b e r p a rt o f th e c a p

5

Has the valve cap fallen
off?

If a strong impact is applied to the valve cap in
the cap unit, it may fall off. Therefore, check that
the cap is securely attached to the cap unit.
Without this part, ink can not be absorbed.

V a lv e s

C h e c k th a t th e c o n n e c to rs a re
n o t c o n n e c te d a s la n t.

NOTE: Before reinstalling the FFCs, be sure to
remove the frame (in red in the figure)
secured to the lower case with two
screws. Otherwise, proper continuity may
not be guaranteed despite the FFCs look
connected without slant.

Troubleshooting

Remove the printer mechanism and release the
carriage lock at the back of the printer
mechanism to move the carriage unit away from
the home position. Then, have a close look at
the cap rubber and check for any problem below.
F o r e ig n m a tte r
D u s t

F ra m e
H e a t S in k

Action

Overview

V a lv e C a p

96

EPSON Stylus Color 900

Revision C

Table 3-31. Cleaning does not Solve the Print Problem (continued)
Step
6

Check Point
Is any ink tube
disconnected from
the cap unit?

Table 3-32. Cleaning does not Solve the Print Problem (continued)

Action

Step

Check Point

Action

Referring to the figure below, check the following
points:
• Connection between two tubes and the bottom of
the cap (Remove the whole cap from the unit to
check the connection.)
• Connection of each tube and the separator.
• Connection of one tube at the bottom of the valve

8

Is the head driver
transistor defective?

If you see the C265 Main board from the heat sink
side, the following four power transistors can be
found:
• Q3 and Q4: Outputs the common voltage for the
row A and B (black nozzle rows)
• Q5 and Q6: Outputs the common voltage for the
row C, D, and E (color nozzles)
To check if each pair transistor is working properly,
check the trapezoid waveform at the emittor terminal
of the charging side (Q3 and Q5). Check the
waveform while running a print.

A p p ly in g /r e
th e m in u s p
L e
( s e m itr a n s p

le a s in g
re s s u re
ft tu b e
a re n t)
C W

In k a b s o r p tio n
R ig h t tu b e
( w h ite )

S e p a ra to r

7

Is the FFC
disconnected from
the printhead
board?

Q 6

Q 5

B 1 3 8 2

D 2 0 8 2

B 1 3 8 2

D 2 0 8 2

+

T r fo r th e
b la c k n o z z le s

Remove the printhead unit from the carriage unit, and
bring the printhead surface side upward to check that
two FFC is properly connected. Even though no slant
connection nor disconnection is found, disconnect
the FFC once and install them again.

F F C 2

Troubleshooting

T H
Q 3

B

C C W

H e a t S in k

Q 4

2 0 V

E

+
T r fo r th e
c o lo r n o z z le s

2 µ

NOTE: Frequency of waveform and voltage level
(p-p) varies if printing is performed through
the driver. Therefore, as long as the
trapezoid waveform is output, the head
driver IC is considered good, and the
printhead must be replaced in that case.

F F C 1

Overview

97

EPSON Stylus Color 900

Revision C

Table 3-33. Cleaning does not Solve the Print Problem (continued)
Step

Check Point

Action

9

Is the head driving
pre-driver defective?

If a trapezoid waveform is not output in the
previous step, check all the power transistors (Q3 Q6) for base waveforms. Like the head transistor
in Step 8, the power transistors also output
trapezoid waveforms, but are input from the predriver side.

H e a t S in k

T H
Q 3

Q 4
B 1 3 8 2

D 2 0 8 2

Unlike the previous products, the procedure after head replacement is
precisely specified. Therefore, be sure to follow the steps in Table 3-34
exactly. The background of the procedure is explained after the table.

Q 6
B 1 3 8 2

Table 3-34.
Ink End Error Occurs after Printhead Replacement
Step

Q 5
D 2 0 8 2

1

Turn the printer power off.

2

Replace the printhead.

3

Turn the printer back on. (The printer is in No Ink Cartridge
condition.)

4

Keep the Load/eject button pressed down for several seconds.
The printer enters the I/C replacement sequence. (The printer
moves to the black ink cartridge replacement position first, then to
the color cartridge replacement position if the Load/Eject button is
pressed.)

5

Input a 21-digit head IC. (Refer to Chapter 4 “Adjustment” for
details.)

6

Perform the initial ink charge operations. (Refer to Chapter 4
“Adjustment” for details.)

7

Perform the head angle adjustment. (Refer to Chapter 4
“Adjustment” for details.)

8

Perform the Bi-D adjustment. (Refer to Chapter 4 “Adjustment” for
details.)

9

Perform the Uni-D adjustment. (Refer to Chapter 4 “Adjustment”
for details.)

E
B
T r fo r th e
b la c k n o z z le s

2 0 V

T r fo r th e
c o lo r n o z z le s

2 µ

Action

If the waveforms are not output correctly, replace
the IC15/16 or C265 Main board. If the waveform is
output correctly, replace the corresponding power
transistor.

Troubleshooting

Overview

98

EPSON Stylus Color 900

Revision C

Among the steps, if you do not perform Step 1 to Step 4 in the correct
order especially, Ink Cartridge Out error (Ink End error) may occur
whenever you replace the printhead. The background of this problem is
as follows.
1. Since the printhead equipped with this printer is composed of 480
nozzles and driven by 32.4 KHz, the temperature inside the
printhead rises more easily than any other printer. Therefore, the
temperatures inside the printhead and on the printhead board must
be intensely monitored to avoid damaging the printhead.
2. Rise in the internal temperature of the printhead can cause a fatal
damage to the printhead itself. Heat inside the printhead is normally
removed as the ink flows inside the printhead.

6. Once the abnormal temperature detection circuit is active, the
printer stops printing and starts a forcible cleaning. This operation
cleans the clogged nozzles, and the ink inside the printhead flow
properly as a result. At this point, the printer sets the flag in the
address for the abnormal temperature detection circuit in the
EEPROM to record the first abnormal temperature error.
7. The printer resumes printing with the data transferred.
8. If the printer detects an abnormally high temperature again, the
printer regards it as the second abnormal temperature error and
enters Ink End Error condition. The printer makes this judgement to
avoid following two problems:




3. If any of the following conditions occurs, the printhead fails to eject
ink properly even though the print data is input.











The printhead surface is left away from the home position for a
long period of time.

Since the I/C has been repeatedly removed and reinstalled, the
printer fails to evaluate the remaining ink level properly and
leaves the I/C in an empty condition.
Since the I/C has been repeatedly removed and reinstalled, the
ink inside gets stale and can not absorb bubbles and viscous ink
into itself.

The same ink cartridge is remove and installed repeatedly.
The table with the printer on it is moved up and down (vertically)
intensely.

4. If the ink does not flow properly, the PZT gradually heats up and is
eventually hot enough to evaporate the ink inside the cavity (a tank
which stores ink).
5. To prevent the printhead from heating up, the 5-channel abnormal
temperature detection circuit is included in the nozzle selector
(directly attached onto the printhead board). With this circuit, the
temperature of each nozzle row (five rows in total) can be
independently monitored. (Refer to Chapter 2 / Section 2.3.2.)

Troubleshooting

9. specifically, the nozzle selectors (5 rows in total) used in the mass
produced Stylus Color 900 are purchased from either of the
following two vendors: EPSON or Sharp. Their ICs slightly differ in
the feed back voltage. Therefore, if the installed printhead has the
nozzle selector and the 1st digit of the printhead ID in the
combination shown in Table 3-35, the printer shows the error at
power on and begins a cleaning automatically. Therefore, even
though the printer continues to print, it forcibly enters the Ink End
error condition for the second time since the flag is already set in the
EEPROM address for the abnormal temperature detection circuit.

Overview

99

EPSON Stylus Color 900

Revision C

Table 3-35. Combination which Causes the Error
Nozzle Selector

1st digit of the Head ID

The board is in the Sharpspecific setting.

0

EPSON exclusive printhead

1

For this reason, if you perform the operation in an incorrect
procedure such as; Head replacement → I/C replacement → Turning
on the printer, the printer starts monitoring the temperatures before
the printhead ID on the board is replaced with a new one, then
shows the error consequently. On the other hand, if you follow the
proper steps; Head replacement → Turning on the printer → proper
I/C replacement with a new one, the program allows a data transfer
once before printing so you can overwrite the printhead ID.

Troubleshooting

Overview

100






DISASSEMBLY AND ASSEMBLY

EPSON Stylus Color 900

Revision C

4.1 Overview
W A R N IN G

This chapter describes procedures for disassembling the main
components of EPSON Stylus Color 900. Unless otherwise specified,
disassembly units or components can be reassembled by reversing the
disassembly procedure. Therefore, no assembly procedures are
included in this chapter. Precautions for any disassembly or assembly
procedure are described under the heading “CHECK POINT”. Any
adjustments required after disassembling the units are described under
the heading “REQUIRED ADJUSTMENT”.

4.1.1 Precautions for Disassembling the Printer










Disconnect the power cable before disassembling or
assembling the printer.
Wear protective goggles to protect your eyes from
ink. If ink gets in your eye, flush the eye with fresh
water and see a doctor immediately.
If ink comes into contact with your skin, wash it off
with soap and water. If irritation occurs, contact a
physician.
A lithium battery is installed on the main board of this
printer. Be sure to observe the following instructions
when serving the battery:




See the precautions given under the heading “WARNING” and
“CAUTION” in the right column and the following page, respectively,
when disassembling or assembling EPSON Stylus Color 900.













Disassembly and Assembly

Overview

Keep the battery away from any metal or other
batteries so that electrodes of the opposite polarity do
not come in contact with each other.
Do not heat the battery or put it near fire.
Do not solder on any part of the battery. (Doing so may
result in leakage of electrolyte from the battery,
burning or explosion.) The leakage may affect other
devices close to the battery.)
Do not charge the battery. (An explosive may be
generated inside the battery, and cause burning or
explosion.)
Do not dismantle the battery. (The gas inside the
battery may hurt your throat. Leakage, burning or
explosion may also result.)
Do not install the battery in the wrong direction. (This
may cause burning or explosion.)

102

EPSON Stylus Color 900

Revision C

C A U T IO N

Danger of explosion if the battery is incorrectly
replaced. Replace only with the same or equivalent
type recommended by the manufacturer. Dispose of
used batteries according to government laws and
regulations.

C A U T IO N

Risque d’explosion si la pile est remplacée
incorrectment. Ne remplacer que par une pile du même
type ou d’un type équivalent recommandé par le
fabricant. Eliminer les piles déchargées selon les lois
et les règles de sécurité en vigueur.

C A U T IO N












Never remove the ink cartridge from the carriage
unless the manual specifies to do so.
When transporting the printer after the ink cartridge
has been installed, be sure to pack the printer for
transport without removing the ink cartridge.
Use only recommended tools for disassembling,
assembling or adjusting the printer.
Apply lubricants and adhesives as specified. (See
Chapter 6 for details.)
Make adjustments specified when you disassemble
the printer. (See Chapter 4 for details.)

Disassembly and Assembly

Overview

103

EPSON Stylus Color 900

Revision C

4.2 Disassembly Procedures
The flowchart below shows procedures for disassembly.

S T A R T

P r in th e a d R e m o v a l

U p p e r C a s e /C o n tro l P a n e l R e m o v a l

C R M o to r R e m o v a l
P r in te r M e c h a n is m

R e m o v a l
P F M o to r R e m o v a l
C 2 6 5 P S B /P S E R e m o v a l

C 2 6 5 M a in B o a r d R e m o v a l

R e la y B o a r d / C o o lin g F a n R e m o v a l

A S F R e m o v a l

S h ie ld P la te o n th e C 2 6 5 M a in
B o a rd R e m o v a l

A S F D is a s s e m b ly

P u m p /A S F M o to r &
S o le n o id R e m o v a l
C R H P S e n s o r R e m o v a l
P E S e n s o r R e m o v a l

F ro n t F ra m e R e m o v a l

E n c o d e r B e lt R e m o v a l

P a p e r E je c t R o lle r R e m o v a l

C a r r ia g e U n it R e m o v a l

P la te n R e m o v a l

P u m p U n it R e m o v a l

P F R o lle r R e m o v a l

A S F S e n s o r R e m o v a l

Figure 4-1. Disassembly Flowchart

Disassembly and Assembly

Disassembly Procedures

104

EPSON Stylus Color 900

C A U T IO N

Revision C

If you have replaced specified parts, you must make
necessary adjustments. See the following tables
which shows the parts removed/replaced and
corresponding adjustments required, and perform
adjustments in the correct order. (See Chapter 5
“Adjsutment” for detailed procedures.)

Table 4-1.
Removed/Replaced Parts and Corresponding Adjustments
Actions taken
Printhead

Corresponding adjustment required

1

Install a new I/C in the I/C replacement sequence.

2

Head Actuator Voltage ID Input

3

Ink Charge Flag Reset

4

Head Angular Adjustment.

5

Bi-Directional Adjustment

1

Head Actuator Voltage ID Input

2

Bi-Directional Adjustment

1

Remove the Printhead and CR Unit.

2

Remove the oil pad. (Refer to Chapter 6.)

3

Clean and lubricate the carriage guide shaft.

4

Reinstall the printhead and the CR Unit.

5

Perform the Parallelism adjustment.

6

Enter the I/C replacement sequence to install a new I/C
and make sure it is completed.

7

Ink Charge Flag Reset

8

Head Angular Adjustment

9

Bi-Directional Adjustment

Waste Ink Pad

1

Clear the protection counter value

CR Motor

1

Bi-Directional Adjustment

Program ROM
replacement

1

Head Actuator Voltage ID Input

2

Bi-Directional Adjustment

C265 Main board

CR shaft

Disassembly and Assembly

Step

Disassembly Procedures

105

EPSON Stylus Color 900

Revision C

4.2.1 Upper Case and Control Panel Removal
1. Remove the sheet guide.

4. Remove one screw securing the front case (on the left) to the printer
mechanism, then pull the front case forward and remove it from the
printer.

2. Open the upper case.

5. Pull the output tray to the left and remove it.

3. Open the output tray.

6. Remove two screws securing the control panel to the printer
mechanism to release the control panel. Then disconnect the FFC
from the control panel and remove the control panel from the printer.

Screws securing
the Upper Case

Sheet Guide

Screws securing
the Control Panel

7. Remove four screws securing the upper case. When assembling,
note the only CBS Tight screw among four must be used at the rear
right of the upper case.
Control
Panel

8. Lift up the front edge of the upper case, then remove the whole case
by tilting it along the ASF.

Control Panel

Output Tray

Screws securing the
Front Case

FFC for the
Control Panel

Front Case

Figure 4-3. Control Panel Removal

Figure 4-2. Upper Case Removal

Disassembly and Assembly

Disassembly Procedures

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Revision C

4.2.2 Printer Mechanism Removal
C H E C K
P O IN T

1. Remove the upper case. (See Section 4.2.1.)
2. Unlock the cable clamp on the relay board, then take all harnesses
out of the cable holder.
Screws securing the
Printer Mechanism

Cable Holder
Relay Board


















When assembling, be sure to connect the connectors
properly as shown in Figure 4-5.

19-pin FFC (used to supply sensors with power and to send
condition detection signals)
2-pin connector for driving the solenoid
Connector for ASF
Connector for PF motor
Connector for Pump/ASF motor
Connector for PE sensor
Connector for CR motor
Connector for CRHP (Carriage Home Position) sensor
C R H P S e n s o r
C R M o to r
P u m p /A S F M o to r
M /C

M /C

W H T

R E D

B L K

C R H
P E

Screws securing the
Waste Ink Drain Pads

Figure 4-4. Printer Mechanism Removal
3. Disconcert the following connectors from the relay board. (The
connectors to be disconnected are colored red in Figure 4-5.)

Disassembly and Assembly

Disassembly Procedures

M /C

Printhead FFCs

A S F

Screw securing the
Printer Mechanism

P F M o to r
fr o m C N 1 1 o n th e m a in b o a r d
fro m
fro m

C N 1 2 o n th e m a in b o a r d
C N 1 0 o n th e m a in b o a r d

fro m

C N 1 6 o n th e m a in b o a r d

S o le n o id

fr o m C N 1 5 o n th e m a in b o a r d
fro m th e c o n tro l p a n e l
A S F S e n s o r
P E S e n s o r

Figure 4-5. Connector Location

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Revision C

4. Remove two screws securing the waste ink drain pad cover to the
lower case and remove it.

4.2.3 C265 Main Board Unit Removal
1. Remove the printer mechanism. (See Section 4.2.2.)

5. Disconnect two printhead control FFCs from the C265 main board.
6. Remove four large screws securing the printer mechanism to the
lower case, and remove the printer mechanism.

2. Remove four screws securing the rear case to the stay on the C265
Main board.

Screws securing the Type B I/F Cover
C A U T IO N









After replacing the Waste Ink Pads, perform any
necessary adjustments. (See Table 4-1)
When installing the FFCs, remove the frame secured
by two screws before connecting the FFCs.
Otherwise, the FFCs will not be connected to the
connectors properly, and the printheads may be
damaged when voltage is applied.
When mounting the four screws, do not fasten them
excessively, or the tapped areas in the lower will be
damaged.
Screws securing the Rear Case
Figure 4-6. C265 Main Board Removal
3. Remove two screws securing the Type B interface cover to the
printer, and remove the rear case.
4. Disconnect two connectors CN5 and CN6 from the C265 Main
board and remove the C265 Main board unit.
C A U T IO N

Disassembly and Assembly

After removing/replacing the C265 Main Board,
perform any necessary adjustments. (See Table 4-1)

Disassembly Procedures

108

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Revision C

4.2.4 Relay Board and Cooling Fan Removal
1. Remove the C265 Main board. (See Section 4.2.3.)
Screws securing the Relay Board
2. Remove all connectors from the relay board. (See Figure 4-5 when
connecting them.)

Screws securing the
Cooling Fan Unit
Relay Board

3. Remove two screws securing the relay board to the shield plate on
the C265 Main board, then remove the relay board.
4. Remove three screws securing the cooling fan unit to the shield
plate on the C265 main board, then separate the cooling fan from
the C265 Main board.
5. Disconnect the connector CN13 (white, 2-pin) from the C265 Main
board, and remove the cooling fan unit.

CN13
Cooling Fan Unit

Figure 4-7. Relay Board and Cooling Fan Removal

Disassembly and Assembly

Disassembly Procedures

109

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Revision C

4.2.5 Shield Plate on the C265 Main Board Removal

4. Disconnect the FFC from the connector CN15 on the C265 Main
board.

1. Remove the C265 Main board. (See Section 4.2.3.)
2. Remove the remaining four connectors from the relay board. (See
Figure 4-5 when connecting them.)

5. Remove two screws securing the shield plate (top) to the bottom
frame, and remove the shield plate (top).
6. Remove the Type-B interface guide.

3. Remove two screws securing the right upper main shield plate to
the bottom frame and another two screws securing the left upper
main shield plate to the bottom frame, then remove the both plates
together.
Screws securing the
Right Upper Main Shield Plate
Screws securing the
Shield Plate (top) Screws securing the
Left Upper Main Shield Plate

7. Remove four screws securing the C265 Main board onto the bottom
frame. (Two screws among the four are fixing the reinforcing plate
for the Type-B interface guide.)
8. Viewing the C265 Main board from the Centronics I/F connector
side, remove four small screws and remove the C265 Main board.
Screws securing the C265 Main Board

Shield Plate (top)

CN15

Right Upper MainShield Plate
Type B I/F Guide
Left Upper Main Shield Plate
Figure 4-9. Shield Plate Removal (2)

Figure 4-8. Shield Plate Removal (1)

Disassembly and Assembly

Disassembly Procedures

110

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Revision C

4.2.6 C265 PSB/PSE Board Removal

4. Remove two screws securing the shield plate on the C265 PSB/
PSE board, and remove the shield plate.

1. Remove the printer mechanism. (See Section 4.2.2.)
Screws securing the Shield Plate
2. Disconnect three connectors CN1, CN2, and CN3 from the C265
PSB/PSE board.
3. Remove three screws (including one for grounding) securing the
C265 PSB/PSE board to the lower case, then remove the C265
PSB/PSE board unit.
Screws securing the C265 PSB/PSE Board

Figure 4-11. Removing the Shield Plate
5. Remove four screws
securing the C265 PSB/
PSE board to the bottom
frame, and remove the
C265 PSB/PSE board.

Screws securing the
C265 PSB/PSE Board

CN1 - CN3

Figure 4-10. Removing the Connectors
.
Figure 4-12. C265 PSB/PSE Board Removal

Disassembly and Assembly

Disassembly Procedures

111

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Revision C

4.2.7 Printer Mechanism Disassembly

Screws securing the
Head Fixing Lever

4.2.7.1 Printhead Removal
Joints (blue)
C A U T IO N

When removing the printhead, make sure the carriage
unit is at the left end of the printer mechanism. If you
try to remove it from any other position, excess force
will be added and the printhead unit may be damaged
as a result.

Cartridge Clamp
FFC Holder

Ink Cartridge
Sensor Cover

1. Remove the printer mechanism. (See Section 4.2.2.)
2. If any ink cartridge is installed in the carriage unit, remove it.
3. Release the carriage lock at the back of the printer mechanism, and
move the carriage unit to the left end of the printer mechanism.
CR Motor
Compression Spring

CR Lock
Joints (black)

PE Sensor Connector

Figure 4-14. Printhead Removal (1)
5. Release two joints (black) in the cartridge clamps from the carriage
unit, and remove the cartridge clamps.

Pump/ASF Motor

6. Remove the compression spring on the left side of the carriage unit.
7. Releasing three hooks securing the cover protecting 2 ink cartridge
sensors in the carriage unit, remove the cover.

Figure 4-13. Releasing the CR Lock
4. Release two joints (blue) in the cartridge clamps to release the
cartridge clamps from the carriage unit.

Disassembly and Assembly

8. Remove the FFC holder on the right edge of the carriage unit by
pulling it upward.

Disassembly Procedures

112

EPSON Stylus Color 900

Revision C

9. Remove two screws securing the head fixing lever which is fixing
the printhead by the bottom of the carriage unit, then pull out the
suspension plate to the right.

12. Lifting up the printhead unit, disconnect 2 FFCs and the connector
(green, 4-pin) for the ink cartridge sensor.

10. Remove two actuators for the ink cartridge sensors. (Note the black
one is for the black cartridge and the white one is for the color
cartridge.)

Green

Blue

White

Figure 4-16. Printhead Removal (2)

C H E C K
P O IN T

When installing the printhead FFCs, make sure the
reinforcing plates on the FFC are installed correctly as
described below:
- White one: on the left side of the printhead.
- Blue one: on the right side of the printhead.

C A U T IO N

After removing/replacing the printhead, perform any
necessary adjustments. (See Table 4-1)

A ctu ato rs

Figure 4-15. Removal of the I/C Detection Actuator
11. Disconnect the green connector for the ink cartridge sensor from the
carriage unit.

Disassembly and Assembly

Disassembly Procedures

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Revision C

4.2.7.2 CR Motor Removal
1. Remove the printer mechanism. (See Section 4.2.2.)

C A U T IO N

2. Release the carriage lock at the back of the printer mechanism, then
move the carriage unit away from the home position. (See Figure
4-13.)

After removing/replacing the CR Motor, perform any
necessary adjustments. (See Table 4-1)

3. Remove two screws securing the CR motor to the printer
mechanism, and remove the CR motor.

Screw securing the CR Motor

Figure 4-17. CR Motor Removal

Disassembly and Assembly

Disassembly Procedures

114

EPSON Stylus Color 900

Revision C

4.2.7.3 PF Motor Removal
1. Remove the printer mechanism. (See Section 4.2.2.)

C A U T IO N




2. Remove the PF roller drive gear from the PF roller shaft.




A high-precision gear is used for the PF roller drive
gear. Therefore, if the PF roller drive gear has been
removed, it must not be used again. Neglecting this
may cause a printer malfunction.
When installing a new PF roller drive gear, be sure to
push it intensively by its center area, not forcing a
push by its edge.
D o n o t p u s h th e e d g e
n o r s u rfa c e o f th e g e a r.

PF Motor Pinion

C e n te r a re a
P F R o lle r D r iv e G e a r

Figure 4-19. PF Roller Driver Gear Installation
PF Roller Drive Gear
Screws securing the PF Motor

3. Remove three screws securing the PF motor to the printer
mechanism, and remove the PF motor.

Figure 4-18. PF Motor Removal
C A U T IO N






Disassembly and Assembly

Disassembly Procedures

PF motor pinion gear as well as the PF roller drive
roller is a high-precision gear. Therefore, be careful
not to damage the gear by hitting it by the frame
edges.
When installing the PF motor, be sure not to touch the
pinion gear surface with a screw driver.

115

EPSON Stylus Color 900

Revision C

4.2.7.4 Pump/ASF Motor and Solenoid Removal

4.2.7.5 ASF Unit Removal

1. Remove the printer mechanism. (See Section 4.2.2.)

1. Remove the DE subassembly frame. (See Section 4.2.7.4.)

2. When removing the solenoid, remove one screw securing the
solenoid to the DE subassembly frame, and remove the solenoid.
To remove the pump/ASF motor, remove three screws securing the
DE subassembly frame to the back of the printer mechanism, then
remove the DE subassembly frame along with the pump/ASF motor.

2. Inserting tweezers from the inner side, release the joint for the ASF
drive gear and the ASF drive shaft to remove the ASF drive gear.
3. Remove two screws securing the ASF unit.
4. Holding the paper hold lever up to the left, remove the ASF unit.

3. Remove two screws securing the pump/ASF motor to the DE
subassembly frame, and remove the pump/ASF motor.

Screws securing the ASF Unit

Screws securing the DE Subassembly Frame
to the Printer Mechanism

Screw securing
the Solenoid

Figure 4-21. ASF Removal
C A U T IO N

DE Subassembly Frame Screws securing the Pump/ASF Motor
Figure 4-20. Pump/ASF Motor and Solenoid Removal

Disassembly and Assembly

When install the ASF be sure to use the correct type of
the screws, as shown below:

 Screw with a flat head: on the right toward the front
side of the printer.

 Screw with a washer: on the left toward the front
side of the printer.

Disassembly Procedures

116

EPSON Stylus Color 900

Revision C

4.2.7.5.1 ASF Disassembly
C H E C K
P O IN T

1. Remove the ASF. (See Section 4.2.7.5.)
2. Remove the left shaft bushing located at the left end of the loading
(LD) roller shaft.

When installing the shaft release hopper lever, pay
attention to the direction for installing it. However, the
lever does not fit in if the direction is wrong. Therefore,
referring to Figure 4-23, find the correct direction with
which you can push the release hopper lever without
force.

4. Shift the whole LD roller shaft to the left about 2 cm. Then, using
tweezers, remove the detection wheel by releasing the tab attaching
the detection wheel to the left end of the LD roller shaft.
F ix in g T a b

B u s h in g F ix in g th e S h a ft
o n th e L e ft
L D R o lle r S h a ft

Figure 4-22. Left Bushing Removal
3. Remove the release hopper lever from the LD roller shaft.
D e te c tio n W h e e l

L D R o lle r S h a ft

Figure 4-24. Detection Wheel Removal

S h a f t 's S id e F a c e

5. Release the peg fixing the hopper assembly to the ASF frame by the
top left. Then separate the hopper assembly and the ASF frame.
H o p p e r A s s e m b ly

A S F F ra m e

L D R o lle r S h a ft
R e le a s e H o p p e r L e v e r ( R ig h t)

Figure 4-23. Release Hopper Lever Removal

Disassembly and Assembly

Figure 4-25.
Separating the Hopper Assembly from the ASF Frame

Disassembly Procedures

117

EPSON Stylus Color 900

Revision C

6. After removing the hopper assembly, shift the LD roller shaft to the
left end to release the right end, then remove the LD roller shaft
along with the right and left paper loading assemblies.

9. Release four hooks securing the LD roller assembly to the frame in
the paper loading assembly, and remove the LD roller assembly.
P a p e r L o a d in g A s s e m b ly

7. Shift the LD roller shaft to the left to pull it out from the paper loading
rollers (right and left).
8. Release one hook securing the LD roller cover in the paper loading
assembly, and remove the LD roller cover.

H o o k s F ix in g th e
L D R o lle r A s s e m b ly

P a p e r L o a d in g
A s s e m b ly

L D R o lle r C o v e r

L D R o lle r C o v e r

Figure 4-27. LD Roller Assembly Removal
C A U T IO N

Never touch the rubber part of the LD roller assembly
with your bare hands.

Figure 4-26. LD Roller Cover Removal

Disassembly and Assembly

Disassembly Procedures

118

EPSON Stylus Color 900

Revision C
r

C H E C K
P O IN T




Before assembling the ASF, ensure the following four
parts are correctly mounted onto the paper loading
assembly.
- One Torsion spring
- One extension spring
- One compression spring
- One rod spring
E x te n s io n S p r in g




When installing the LD roller shaft with the both paper loading
assemblies on it into the ASF frame, shift the right paper
loading assembly to the right edge of the ASF frame, then fix it
by aligning the groove in the back of the paper loading
assembly with the rail ribs on the inner side of the ASF frame.
Fix the left paper loading assembly also by aligning it with the
rail ribs on the inner side of the ASF frame. The left paper
loading assembly, however, moves freely from left to right or
vice versa.
A S F F ra m e

R o d S p r in g
P a p e r L o a d in g A s s e m b ly

A S F F r a m e R ib s
P a p e r L o a d in g
A s s e m b ly

T o r s io n S p r in g

C o m p r e s s io n S p r in g 1 .6 6

Figure 4-28. Parts in Paper Loading Assembly




Figure 4-29. LD Roller Shaft Installation

When installing the paper loading assembly, set the
edge whose narrow portion is longer than the other to
the left.

Disassembly and Assembly

Disassembly Procedures

119

EPSON Stylus Color 900

C H E C K
P O IN T




Revision C

When installing the hopper assembly into the ASF
frame with the paper loading assemblies and LD roller
assemblies mounted on it, set the straight end (one of
the ends of each spring is bent straight) facing
upward. Then hook the straight end to the frame as
shown in the top figure below. After setting the
assembly, insert tweezers through the cutout in the
back of the ASF frame to release the straight end of
the compression spring as shown in the bottom figure
below.
C o m p r e s s io n S p r in g 1 .6 6










Be sure to fix both right and left pegs on the ASF frame
securely into the sockets in the hopper assembly.
When installing the detection wheel onto the left end of the LD
roller shaft, align the protruding portion of the LD roller shaft
with the concave portion of the detection wheel.
Ensure that the left frame of the left paper loading assembly fits
correctly into the groove in the left part of the left edge guide in
the hopper assembly.
Make sure the bushing fixing the left hopper release lever by
the left part of the shaft is attached to the correct position as
shown in the figure below.
H o p p e r A s s e m b ly G u id e

H o o k s in th e F r a m e
C u to u t in th e b a c k o f th e A S F F r a m e
S tr a ig h t E n d o f th e
C o m p r e s s io n S p r in g ( 1 .6 6 )

B u s h in g F ix in g th e S h a ft

L e ft F r a m e in th e
L e ft P a p e r L o a d in g A s s e m b ly

Figure 4-31. Assembling the ASF

Figure 4-30. Hopper Assembly Installation

Disassembly and Assembly

Disassembly Procedures

120

EPSON Stylus Color 900

Revision C

4.2.7.6 ASF Sensor Removal

4. Disconnect the connector from the ASF sensor.

1. Remove the ASF unit. (See Section 4.2.7.5.)

5. Using tweezers, release one of the hooks securing the ASF sensor,
and remove the ASF sensor.

2. Viewing the ASF unit from the front, remove the bushing (left) fixed
at the left end of the shaft.

A S F F r a m e ( L e ft S id e v ie w )

B u s h in g F ix in g th e S h a ft
o n th e L e ft
L D R o lle r S h a ft

Figure 4-32. Left Bushing Removal
3. Release the hook securing the detection wheel and push the
detection wheel to remove.

A S F H P S e n s o r

Figure 4-34. ASF Sensor Removal
F ix in g T a b

D e te c tio n W h e e l

L D R o lle r S h a ft

Figure 4-33. Detection Wheel Removal

Disassembly and Assembly

Disassembly Procedures

121

EPSON Stylus Color 900

Revision C

4.2.7.7 CRHP Sensor Removal

4.2.7.8 PE Sensor Removal

1. Remove the printer mechanism. (See Section 4.2.2.)

1. Remove the printer mechanism. (See Section 4.2.2.)

2. Pushing two of the four hooks securing the CRHP sensor, remove
the CRHP sensor.

2. Release the hook securing the PE sensor at the back of the printer
mechanism, and remove the PE sensor.

H o o k s A tta c h in g th e
P a p e r E n d S e n s o r

T o p F ra m e

CRHP Sensor

L o c a tio n h o le s

Push the hooks.

Figure 4-36. PE Sensor Removal
Figure 4-35. CRHP Sensor Removal

Disassembly and Assembly

Disassembly Procedures

122

EPSON Stylus Color 900

Revision C

4.2.7.9 Encoder Belt Sensor Removal
C A U T IO N

1. Remove the printer mechanism. (See Section 4.2.2.)
2. Using your hand, push the fixing lever holding the encoder belt by
the left end to the right, then remove the encoder belt when the
encoder belt is released enough.

Fixing Lever

When installing the encoder belt, be sure to place it
between the flags for the photo sensor attached to the
back of the carriage unit. Failure to do so will bring a
fatal error at power on.

Encoder Belt
(Linear Scale)

L in e a r S c a le
( E n c o d e r B e lt)

E n c o d e r

C a r r ia g e U n it

Figure 4-38. Positioning the Encoder Belt
Figure 4-37. Encoder Belt Removal

Disassembly and Assembly

Disassembly Procedures

123

EPSON Stylus Color 900

Revision C

4.2.7.10 Carriage Unit Removal

6. Release the hook securing the paper thickness adjusting lever to
the printer mechanism, then push the paper thickness adjusting
lever inward to remove it.

1. Remove the printer mechanism. (See Section 4.2.2.)

PG Adjust Lever

2. Remove the encoder belt. (See Section 4.2.7.9.)
3. Remove the tension spring from the belt pulley holder.

Spring
Torsion Spring
Hook

Pulley Holder

Figure 4-40. PG Adjust Lever Removal

Figure 4-39. Belt Tension Spring Removal
4. Push the belt pulley holder to the right (HP side) to fit the holder in
the cutout in the left frame, then push out the belt pulley holder to
the front.
5. Remove the spring fixing the paper thickness adjusting lever with
tension.

7. Remove the E-ring fixing the
carriage guide shaft and the
parallelism adjustment bushing
(right) and then the washer and
the spring washer to release the
parallelism adjustment bushing
(right). (Note the concave side
of the spring washer faces to
the printer mechanism side.)
8. Remove the screw fixing the
parallelism adjustment bushing
(right).

Parallelism Adjustment
Screw
Bushing (right)

E-ring
Figure 4-41. Parallelism
Adjustment Bushing Removal

Disassembly and Assembly

Disassembly Procedures

124

EPSON Stylus Color 900

Revision C

9. Turn the parallelism adjustment bushing to the left to align the
bushing with the cutout in the left frame, then pull the parallelism
adjustment forward.

4.2.7.11 Pump Unit Removal

10. Shift the whole carriage guide shaft to the right to release the joint at
the left end, then remove the carriage guide shaft and carriage unit
together.

2. Remove three screws securing the pump unit and remove the pump
unit along with the frame.

C A U T IO N








1. Remove the printer mechanism. (See Section 4.2.2.)

Screws securing the Pump Unit
After removing/replacing the Carriage Unit (Carraige
Guide Shaft), perform any necessary adjustments.
(See Table 4-1)
When removing the carriage guide shaft, pay
atttention to the oil pad as it will come off the
carriage.
When lubricating the carriage guide shaft, be sure to
follow the correct order by referring to Chapter 6.

Pump Unit

Screws securing the Pump Unit
Figure 4-42. Pump Unit Removal

Disassembly and Assembly

Disassembly Procedures

125

EPSON Stylus Color 900

Revision C

4.2.7.12 Paper Eject Frame Removal

4.2.7.13 Paper Eject Roller Removal

1. Remove the printer mechanism. (See Section 4.2.2.)

1. Remove the paper eject frame. (See Section 4.2.7.12.)

2. Remove the pump unit. (See Section 4.2.7.11.)

2. Turning the bushings fixing the paper roller by the both ends
upwards, and remove the paper eject roller.

3. Remove the carriage unit. (See Section 4.2.7.10.)
4. Remove hooks securing 2 FFC holders (one on the paper eject
frame and the other on the right frame), and remove the FFC
holders.

Paper Eject Roller

Bushing

Screws securing the Paper Eject Frame

Right Frame

Figure 4-44. Paper Eject Roller Removal

Paper Eject Frame

FFC Holders
Figure 4-43. Paper Eject Frame Removal
5. Remove two screws securing the paper eject frame, and remove the
paper eject frame.

Disassembly and Assembly

Disassembly Procedures

126

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Revision C

4.2.7.14 Platen Removal
1. Remove the paper eject roller. (See Section 4.2.7.13.)
2. Lift up the front edge of the platen, and remove the plate.

Platen

Figure 4-45. Platen Removal

Disassembly and Assembly

Disassembly Procedures

127

EPSON Stylus Color 900

Revision C

4.2.7.15 PF Roller Removal

4. Pull all the paper guides (upper) out to the front side of the printer
mechanism (paper ejection side).

1. Remove the platen. (See Section 4.2.7.14.)
2. Remove the screw securing the paper support lever to the printer
mechanism, and remove the paper hold lever along with the stay.
Screw Securing the Paper Support Lever

C A U T IO N

When installing the paper guide located on the left
edge (HP side), be sure to insert it from the rear side of
the printer mechanism: because it has a cutout in
which the actuator for the PE sensor falls, and if the
paper guide is removed to the rear, the actuator will be
damaged.

5. Remove the tension spring stretching the encoder belt from the
back of the printer mechanism.
Tension Spring
Figure 4-46. Paper Hold Lever Removal
3. From the back of the printer mechanism, release the torsion springs
securing the paper guides (upper) to release the paper guides
(upper).
Torsion Spring
(six springs in total)

Figure 4-48. Tension Spring Removal
6. Remove two screws securing the top frame and remove the top
frame.
Paper Guides (Upper)
Figure 4-47. Releasing the Paper Guide (Upper)

Disassembly and Assembly

Disassembly Procedures

128

EPSON Stylus Color 900

Revision C

7. Remove three screws securing the top frame (two by the front and
the rest by the rear right of the printer mechanism), and remove the
top frame.
Screws securing the Top Frame

8. among two bushings securing the PF roller by the both ends, turn
the left one (on the 80th column side) upward to release the PF
roller, then shift the whole shaft to the right and remove the PF
roller. (The paper guide (lower) is remove together.)
C A U T IO N

Never touch the PF roller with your bare hands.

Bushing (left)

2

PF Roller

1

Top Frame
Figure 4-49. Top Frame Removal (1)

Figure 4-51. PF Roller Removal

Screw securing the Top Frame (at the back)
Figure 4-50. Top Frame Removal (2)

Disassembly and Assembly

Disassembly Procedures

129






ADJUSTMENT

EPSON Stylus Color 900

Revision C

5.1 Overview
This chapter contains all adjustments procedures for Stylus Color 900.

C A U T IO N

5.1.1 Conditions for Each Adjustment
This section includes each adjustment which is required after repairing
or replacing specific parts used in the Stylus Color 900. Some of the
adjustments have the specified order to perform, depending on the
contents of the adjustment. Therefore, observe the points shown under
the heading “CAUTION” in the right column well and perform the
adjustments properly in the correct order, referring to Table 5-1 - Table
5-3.














Adjustment

Overview

When adjusting the printer, be sure to refer to Table
5-1 to check for all the necessary adjustment items
and perform them in the correct order. Failure to do
so may directly affect to print quality adversely.
In this printer, the head angle adjustment can be done
without removing the upper case. However, since the
head fixing plated is installed with two screws,
observe the instruction in this manual to perform the
adjustment properly.
The C language used in the service program only
applies to the PCs which run DOS/V. Therefore, be
sure to run DOS/V to use the service program, since If
other types of PCs such as 98-series or the one which
does not support bidirectional communication
system are used, the program does not run properly
and adjustments can not be made.
When performing Initial Ink Charge forcibly, be sure
to have a new ink cartridge ready.
Before clearing the waste ink pad counters using the
service program, make sure the waste ink pads have
been replaced in advance. Lack of this operation may
cause the ink to leak from the lower case.

131

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Revision C

Table 5-1.
Actions Taken and Corresponding Adjustments in Order
No.
1

Actions taken
Printhead
replacement

Step
1

2

2

C265 Main board
replacement

Adjustment

Table 5-2. (continued)
Actions Taken and Corresponding Adjustments in Order

Corresponding adjustment required

No.

Actions taken

Step

3

CR shaft
replacement or
cleaning

1

Referring to Chapter 6 “Maintenance”, remove
the oil pad from the carriage.

2

Referring to Chapter 6 “Maintenance”, perform
the followings:
1. Clean the carriage shaft surface.
2. Perform the preliminary lubrication.
3. Oil the newly installed pad.
4. Install the carriage shaft to the carriage unit.

Install a new I/C in the I/C replacement sequence
(user performable) and make suer it is
completed.

1. To avoid counter mis-matching
2. To preliminarily avoid head hot error which
would occur in Step 3. (For details, refer to
Chapter 2 / Sensor descriptions.)
Perform “Ink Charge Flag Reset” using the
service program and then turn the printer off. In
10 seconds, turn the printer back on, and the
“Initial Ink Charge” begins automatically.

3

Input a 22-digit ID in “Head Actuator Voltage ID
Input” using the service program.

4

Perform “Head Angular Adjustment” using the
service program.

5

Perform “Bi-Directional Adjustment” using the
service program.

1

Input the model name in the service program.

2

Select the destination in the service program.
 To set the CG and default value.

3

Input a 22-digit ID in “Head Actuator Voltage ID
Input” using the service program.

4

Perform “Bi-Directional Adjustment” using the
service program.

Overview

Corresponding adjustment required

NOTE: Make sure the printhead has been
removed before supplying oil to the new
oil pad.
3

Reinstall the printhead to the carriage.

4

Perform Parallelism adjustment.

5

Enter the I/C replacement sequence to install a
new I/C and make sure it is completed.

1. To avoid counter mismatching.
2. To preliminarily avoid head hot error which
would occur in Step 7. (For details, refer to
Chapter 2 / Cooling Fan Driver Circuit.)

6

Perform “Ink Charge Flag Reset” using the
service program and then turn the printer off. In
10 seconds, turn the printer back on, and the
“Initial Ink Charge” begins automatically.

7

Perform “Head Angular Adjustment” using the
service program.

8

Perform “Bi-Directional Adjustment” using the
service program.

132

EPSON Stylus Color 900

Revision C

Table 5-3. (continued)
Actions Taken and Corresponding Adjustments in Order
No.
4

Actions taken

Corresponding adjustment required

1

Perform “Head Cleaning” using the service
program.

2

If the step 1 is not effective, perform “Ink Charge
Flag Reset” using the service program and then
turn the printer off. In 10 seconds, turn the printer
back on, and “Initial Ink Charge” begins
automatically.

Waste Pad
replacement

1

Replace the waste ink pad.

2

Return the current counter values for the waste
ink pads to zero by selecting “Indication of the
counter value of waste ink pad” then “Clear the
protection counter value” using the service
program.

6

CR motor
replacement

1

Perform “Bi-Directional Adjustment” using the
service program.

7

Program ROM
replacement *1

1

Input a 21-digit ID in “Head Actuator Voltage ID
Input” using the service program.

2

Perform “Bi-Directional Adjustment” using the
service program.

5

Clogged nozzles
recovery

Step

*1: When the ROM (revision TEE01A, 01B, or 01C) is repalced with the
revised one (TEE01D or newer).

NOTE:
Installing a ROM (version TEE01D or newer) in place of the older
version (version TEE01A, 01B, 01C) will change the output
waveform control for ink firing. For this reason, you are required to
re-input the head ID and perform Bi-D adjustment whenever you
have replaced the ROM (version TEE01A, 01B, or 01C) with the
revised one (revision TEE01D or newer)

Adjustment

Overview

133

EPSON Stylus Color 900

Revision C

5.2 Adjustments

5. If the indicated model name is Stylus Color 900 only, press Enter
key.

This section describes the procedure for each adjustment. Be sure to
observe the CAUTION and tables in Section 5.1.1 before starting
adjustments.

NOTE:






5.2.1 Preliminary Operation
Perform the preliminary operation, which is required prior to actual
adjustment operation, by following the steps below.
1. Connect the PC and printer with PRIF4.

If we OEM this product in future, there will be a possibility that
more model names are added to the option. In this case, be sure
to select the model name you are dealing with correctly.
The command required to write adjustment value for each
adjustment includes a model-unique parameter, which is called
R-code. The purpose of selecting the model name is to define
the parameter which is specific to the model.

6. The following screen appears.

2. Turn the printer on.
3. Launch the service program (SC900.EXE) attached to the service
manual for the Stylus Color 900.

< *> < *> < *>

S e r v ic e P r o g r a m

S e r v ic e P r o g r a m

< *> < *> < *>

S e le c t th e d e s tin a tio n .

4. The following screen appears.

< *> < *> < *>

b o o t p ro c e s s

b o o t p ro c e s s

E A
E A
E A
E A
E D
E D

< *> < *> < *>

I
I(C
I(L
I(L
G
G (

A N A D A )
A T IN 1 2 0 V )
A T IN 2 2 0 V )
N L S P )

E IS
E IB
E U
E U
E U
E A
L

L (1 2 0 V )
L (2 4 0 V )
L (2 3 0 V / N L S P )

E S
E H
E H
E T
E U
E F

P
K

K (P H U L )
S

T

R O

P le a s e s e le c t th e m o d e l n a m e .
E s c : P r e v io u s

U p /D o w n a rro w s :

S e le c t

E n te r: O K

S ty lu s C O L O R 9 0 0

Figure 5-2. Destination Selection Screen

E s c : Q u it

U p /D o w n a rro w s :

S e le c t

E n te r: O K

7. From the option in screen (Figure 5-2), select the destination which
applies to the model on which you are making adjustments, then
press Enter.

Figure 5-1. Screen after Start-up Sequence

Adjustment

Adjustments

134

EPSON Stylus Color 900

Revision C

NOTE:

NOTE:
If “Get (Check this model name)” is selected, the printer writes the
value selected in Step 5 into the EEPROM, then begins the
following routine to read the data; 1) Resets the Hardware 2)
Returns to the idles state 3) Reads the model name. For this
reason, the printer takes 25 - 30 seconds to read data. Since the
service program for the Stylus Color 900 shows the countdown to
inform the service person of the period of time to wait until the whole
process (from the writing to the EEPROM to reading data) is
completed.

The purpose of the operation in Step 7 are:






To select CG; NLSP or STD.
To initialize various settings (user selectable settings).

8. In 5 or 6 seconds, the following screen appears.

< *> < *> < *>

S e r v ic e P r o g r a m

b o o t p ro c e s s

D o y o u s ta r t th e S e r v ic e P r o g r a m

< *> < *> < *>

10. Select “Perform (Boot this program)”.
?

11. The main adjustment screen shown in Figure 5-4 appears.

P e r fo r m ( B o o t th is P R O G R A M )
N o
( R e - s e le c t m o d e l n a m e )
G e t ( C h e c k th is m o d e l n a m e )

* * * * * * * * * * E P S O N S ty lu s C O L O R 9 0 0 S E R V IC E P R O G R A M

E s c : Q u it

U p /D o w n a rro w s :

S e le c t

V e r s io n 1 .2

**********

E n te r: O K

< > < > S E R V IC E IT E M S < > < >
< <

Figure 5-3. Screen after Destination Selection

< <
< <
< <

9. Option in the screen (Figure 5-3) means the following:
9-1. Perform: Select this to directly proceed to the main adjustment
screen.
9-2. No:
Select this to return to the initial screen (Figure 5-1),
which lets you correct the wrong selection made in
Step 5 or Step 6.
9-3. Get:
Select this to confirm the selection (model name/
destination) made in Step 5 orStep 6.
(See the note in the right column for details.)

Adjustment

Adjustments

E S C : Q u it

A d ju
A d ju
M a in
P r in t

s tm
s tm
te n
A 4

e n t 1
e n t 2
a n c e
P a tte rn

> >

> >
> >
> >

U p /D o w n a r r o w s : S e le c t

E n te r: O K

Figure 5-4. Main Adjustment Menu Screen

135

EPSON Stylus Color 900

Revision C

5.2.2 Market Destination Check

5. The following screen appears.

This section describes how to confirm the destination selected in
Section 5.2.1 / Step 6. Unlike reading the model name (Section 5.2.1 /
Step 9-3), this routine only includes reading data from the printer’s
RAM. Therefore, the marked destination can be checked immediately.

M a r k e t D e s tin a tio n C h e c k

1. Referring to Section 5.2.1, perform the preliminary operation.
C h e c k in g th e p r e s e n t M a r k e t D e s tin a tio n

2. Select “Adjustment 1” in the main adjustment screen (Figure 5-4).
3. The following screen appears.

E s c : P r e v io u s
* * * * * * * * * * E P S O N S ty lu s C O L O R 9 0 0 S E R V IC E P R O G R A M

< <

V e r s io n 1 .2

E n te r: O K

**********

Figure 5-6. Market Destination Check Selection Screen

A d ju s tm e n t 1 > >

M a r k e t D e s tin a tio n C h e c k

6. Press the Enter key again.

H e a d A c tu a to r V o lta g e ID In p u t

7. The following screen appears. The screen enables you to check the
selection made in Section 5.2.1 / Step 6. (The following figure is a
sample screen when the NLSP version for EDG is selected.)
E S C : Q u it

U p /D o w n a r r o w s : S e le c t

E n te r: O K

Figure 5-5. Sub Adjustment Screen
4. Move the cursor to “Market Destination Check” and press the Enter
key.

Adjustment

Adjustments

136

EPSON Stylus Color 900

Revision C

5.2.3 Head Actuator Voltage Input
This section describes how to input Head ID. Perform this operation
under the following conditions:

R e a d in g o u t th e p r e s e n t M a r k e t D e s tin a tio n

1. The printhead has been replaced.
M a r k e t D e s tin a tio n is W o r ld N L S P .

2. The C265 Main board has been replaced.
3. When the ROM (version TEE012A, 01B, or 01C) is replaced with
the revised one (TEE01D or newer).

NOTE:






After replacing the printhead, be sure to install a new ink
cartridge in the I/C replacement sequence before inputting the
Head ID.
After replacing the printhead, if you install the I/C before turning
on the printer, the next power on may cause the Head Hot Error
(Panel Indication = Ink Out Error), and the printer loses all
controls by the PC in that error condition.

E s c : P r e v io u s

Figure 5-7. Head ID Input / Check Selection Screen
5. Select “Input data”.

1. Before replacing the printhead or main board, make a note of a 22digit head ID.

H e a d A c tu a to r V o lta g e ID In p u t

C h e c k p re s e n t d a ta
In p u t d a ta

2. Referring to Section 5.2.1, perform the preliminary operation.
3. Select “Adjustment 1” and then “Head Actuator Voltage ID Input”.

T h e r e is a p o s s ib ility th a t y o u e n c o u n te r th e in k o u t e r r o r if y o u ig n o r e th e fo llo w in g
p r o c e d u r e fo r r e p la c in g th e p r in t h e a d . T h e r e fo r e , y o u m u s t k e e p th e fo llo w in g p r o c e d u r e
w h e n y o u r e in s ta ll a b r a n d -n e w h e a d .
1 .

4. The following screen appears.

2 .
3 .
4 .
5 .

W r ite d o w n th e n e w h e a
T u r n o n th e p r in te r . (I/C
In s ta ll th e b r a n d -n e w I/C
In p u t th e h e a d ID w r itte n
a u to m a tic a lly r e tu r n to t
C o n tin u e to th e h e a d a d

d ID . R e
o u t e rro
b y o b e
o n th e
h e in p u
ju s tm e n

* * * * * * D o n 't in s t a ll a b r a n d - n e w

E s c : P r e v io u s

p la
r w
y in
h e
t m
t s

c e th e o ld
ill o c c u r .)
g th e u s u a
a d . (If y o u
o d e .)
u c h a s th e

h e a d w ith a b r a n d -n e w

h e a d .

I/C

b e fo r e y o u tu r n o n th e p r in te r . * * * * * *

l I/C r e p la c e m e n t s e q u e n c e .
m is -ty p e th e h e a d ID , th e p r o g r a m

w ill

H e a d A n g u la r a n d B i-D .

U p /D o w n a r r o w s : S e le c t

E n te r: O K

Figure 5-8. Head ID Input Screen

Adjustment

Adjustments

137

EPSON Stylus Color 900

Revision C
NOTE:

6. The following screen appears.

Like ROMs mentioned in step 7, there are also new and old versions
for printheads. The new printheads and old printheads are defined
as described below:
W h ic h R O M

O ld R O M ( T E E 0 1 C
N e w R O M (T E E 0 1 D

Y o u c a n fin d th e c u r r e n t R O M
th e T y p e -B I/F c o v e r.

E S C : Q u it






v e r s io n d o e s y o u r p r in te r h a v e ?
o r o ld e r )
o r la te r )

The 22th digit is A, B, or C.

New printhead:

The 22th digit is D or newer.

Due to the diversity of versions, there are total of four combinations
of ROM version and printhead ID. For two combinations of them,
however, the program prompts ROM replacement or converts head
ID to be registered. This is required to keep the print quality even
among all combinations. This complicated operation can be easily
done by following the user interface of this program.See the
flowchart in the next page for the detailed process of ID input.

v e r s io n b y r e m o v in g

U p /D o w n a r r o w s : S e le c t

Old printhead:

E n te r: O K

Figure 5-9. ROM Version Selection Screen
7. Remove the Type-B interface and check the version of the currently
installed ROM. Note the ROM version whose last digit is A, B, or C
is defined as “Old ROM”, while the one tailed with D or newer is
defined as “New ROM”.
8. After checking the ROM status; New or Old, select “Old ROM” or
“New ROM” in the screen.

Adjustment

Adjustments

138

EPSON Stylus Color 900

Revision C

S T A R T
< R O M

v e r s io n s e le c tio n
s c re e n >
W h a t is th e
R O M v e r s io n ?

< T e c h n ic a l c o d e in p u t s c r e e n >
O ld R O M
T E E 0 1 C

o r o ld e r

W h a t
d o e s th e 2 2 n d
d ig it o f th e te c h n ic a l
c o d e s h o w ?

N e w R O M
T E E 0 1 D

o r n e w e r

W h a t
d o e s th e 2 2 n d
d ig it o f th e te c h n ic a l
c o d e s h o w ?

< H e a d ID in p u t s c r e e n 1 >

< M e s s a g e s c re e n >
N e w h e a d
D o r n e w e r

T h e p ro
r e p la c e
r e v is e d
a n d p re

g ra m p
th e o ld
o n e (T
s s th e

ro m
R O
E E 0
Y k e

p ts
M
1 D
y a

to
w ith th e
o r n e w e r)
fte r r e p la c e m e n t.

ID in p u t m e n u .
T h e in p u t ID is r e g is te r e d in th e
E E P R O M w ith o u t c o m p e n s a tio n .

O ld h e a d

ID in p u t m e n u .

C o r o ld e r

T h e in p u t ID is r e g is te r e d in th e
E E P R O M w ith o u t c o m p e n s a tio n .

ID in p u t m e n u .

N e w h e a d

T h e in p u t ID is r e g is te r e d in th e
E E P R O M w ith o u t c o m p e n s a tio n .

D o r n e w e r

H e a d ID
O ld h e a d

in p u t s c r e e n 2

T h e p r o g r a m a u to m a tic a lly
c o m p e n s a te s th e in p u t d a ta , a n d
r e g is te r s it in th e E E P R O M .

C o r o ld e r

Figure 5-10. Detailed Flowchart for the Head Angular Voltage Input

NOTE:
As shown in the flowchart, there are two specific cases, which are:
1) The ROM’s version is old and the newly installed printhead’s
version is new.

2) The ROM’s version is new and the newly installed printhead’s
version is old.

For this combination, the program prompts you to revise the
current ROM with a new version because the old ROMs do not
support new printheads.

Adjustment

Adjustments

For this combination, the program automatically converts the
input ID so the ID matches the old head. Therefore, please be
aware that the ID indicated in the screen differs from the one
you have actually input.

139

EPSON Stylus Color 900

Revision C

9. Type exactly the 22-digit Head ID you made a note of. If you type a
wrong ID, the program automatically calculates and detects it. The
screen returns to the ID input screen. The following screen shows
the process the program takes for a wrong ID. In this screen, press
Enter, and the screen returns to the Head ID Input Screen (Figure
5-8).

H E A D A C T U A T O R

V O L T A G E ID is c o r r e c tly a c c e p te d .

W r itin g n o w o n E E P R O M .

*

N e w R O M

*

E n te r th e 2 2 - d ig it v o lta g e ID
H E A D A C T U A T O R V O L T A G E ID =

R e a d in g a n d c o v e r tin g n o w

fo r c o n fir m a tio n .

A s th e h e a d a c tu a to r v o lta g e , 0 4 B 4 3 4 D 4 8 5 2 5 0 0 0 0 0 0 0 0 S
h a s b e e n w r itte n in E E P R O M .

Figure 5-11. Screen for ID Correction (for New ROM)

A s th e h e a d a c tu a to r v o lta g e , 0 4 B 4 3 4 D 4 8 5 2 5 0 0 0 0 0 0 0 0 S
h a s b e e n w r itte n in E E P R O M .

10. When the 22-digit ID has been correctly input, the following 3
screens appear in sequence as shown in Figure 5-12, and the ID is
registered in the printer’s RAM. (Though the screen messages
indicate that the ID has been input in the EEPROM, it is actually
written into the EEPROM when the printer is turned off.)

E S C : P r e v io u s

11. Press ESC key twice. The screen returns to the sub adjustment
menu screen to continue to the next adjustment.
Figure 5-12. 22-digit ID Input Sequence

Adjustment

Adjustments

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EPSON Stylus Color 900

Revision C

5.2.4 Head Angular Adjustment

3. Select “Head Angular Adjustment”. The following screen appears.

This section describes how to adjust the head angular. This adjustment
must be made under the following conditions:

H e a d A n g u la r A d ju s tm e n t

1. The printhead has been removed. (When the printhead has
been replaced.)

P r in t th e h e a d a n g u la r a d ju s tm e n t p a tte r n
H e a d a n g u la r a d ju s tm e n t

2. The head angular adjustment lever has been moved. (Be sure
to release two screws securing the head fixing plate before
moving the lever. Failure to do so may damage the lever.)
3. CR Guide Shaft has been lubricated. (Notice you are required
to remove the printhead before lubricating the CR guide shaft in
this printer. Refer to Chapter 6 “Maintenance”.)

E s c : P r e v io u s

U p /D o w n a r r o w s : S e le c t

E n te r: O K

Figure 5-14. Head Angular Adjustment Initial Screen

4. CR guide shaft has been removed.

NOTE:
Be sure to use Super Fine paper for Head Angular Adjustment.
1. Referring to Section 5.2.1, perform the preliminary operation.

4. Select “Print the head angular adjustment pattern” to check the
current head angular condition.
5. The following screen appears and the printer starts running Head
Angular Adjustment Pattern.

2. In the main adjustment menu, select “Adjustment 2”. The following
screen appears.

* * * * * * * * * * E P S O N S ty lu s C O L O R 9 0 0 S E R V IC E P R O G R A M

V e r s io n 1 .2

**********

T h e H e a d A n g u la r A d ju s tm e n t p a tte r n w ill b e p r in te d .
< < A d ju s tm e n t 2

> >

H e a d A n g u la r A d ju s tm e n t
B i- D ir e c tio n a l A d ju s tm e n t

E S C : Q u it

U p /D o w n a r r o w s : S e le c t

E n te r: O K

Figure 5-15.
Screen during the Head Angular Adjustment Pattern Print

Figure 5-13. Adjustment 2 Selection Screen

Adjustment

Adjustments

141

EPSON Stylus Color 900

Revision C

6. The printer executes printing and automatically ejects the sheet.
C H E C K
P O IN T

Figure 5-16. Print Result of the Head Angular Adjustment Pattern
7. Referring to Figure 5-17 and Figure 5-18, determine whether the Hshape patterns are good or not. The figures includes four patterns
which are OK and four patterns which are NG (No Good).

If you don’t find a perfect H without white lines, please
find the one which satisfies the condition below:

 Two white lines are symmetry.

 Both right and left lines are the same width.

 If all patterns have white lines, the one with the
narrowest lines (line) is the best. See the examples
below. Considering the conditions above, the
Example 5 is the best.
E x a m p le 1

E x a m p le 2

E x a m p le 3

E x a m p le 4

E x a m p le 5

O K P a tte rn
P a tte rn 1

P a tte rn 2

P a tte rn 3

P a tte rn 4

P a tte rn 5

Figure 5-19. Example to be Selected
8. After performing the procedures in Step 7, if no problem was found,
you do not need to continue to the next step. If the head angular
needs to be adjusted, continue to the next step.

W h ite lin e s a p p e a r s y m m e tr ic a lly .

Figure 5-17. OK Patterns

N G

P a tte rn

P a tte rn 1

P a tte rn 2

P a tte rn 3

P a tte rn 4

P a tte rn 5

9. The rest of the procedure includes the steps to follow when the
output pattern is NG. By this time, the screen has automatically
returned to the Head Angular Adjustment Initial screen (Figure
5-14), where you are to select “Head Angular Adjustment”.

W h ite lin e s a p p e a r o n th e s a m e p o s itio n .

Figure 5-18. NG Patterns

Adjustment

Adjustments

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EPSON Stylus Color 900

Revision C

10. The following screen appears.

12. Select “Yes” in the screen (Figure 5-20).

NOTE:
Y e s
N o

E s c : P r e v io u s

U p /D o w n a r r o w s : S e le c t

E n te r: O K

Figure 5-20.
Yes/No Selection Menu before Head Angular Adjustment
11. At this point, loosen the screw securing the head fixing plate on the
left of the carriage unit by turning it 90° - 180°. (Be careful not to
remove it completely.) If you have already selected No in the
screen, the program will indicate a message to prompt you to loosen
the screw prior to the adjustment. (See the figure below.) Be sure to
select “Yes” in the screen (Figure 5-20) after you have loosened the
screw as instructed in this step.
S c r e w s e c u r in g th e H e a d F ix in g P la te

If no printing data (command) is input to this printer for 3 minutes
while power is on, the current which magnetizes the Pump/ASF
motor completely drops. The drive sent from this motor is also used
to lock/release the carriage lock lever. For this reason, if the special
command for the adjustment is generated after 3 minutes to move
the carriage, the printer directly enters the carriage lock lever
releasing operation without the rush current control which is done
while magnetizing the motor. As a result, there is a possibility that
the carriage collides because of the incompletely released lever and
the error occurs. Therefore, please be aware that the program runs
a cleaning that is originally supported by the hardware if no action
was made for 3 minutes before moving the carriage. Note if the
printer enters the cleaning before printing the Head Angular
Adjustment Pattern, it is not abnormal. In this case, the program
follows the steps below to avoid misunderstanding.
Note Step 1: The initial screen (same as in Figure 5-20) appears.
(The top screen in Figure 5-22)
Note Step 2: If no action is taken for 3 minutes or more, the next
screen appears. (The middle screen in Figure 5-22)
Note Step 3: As the program prompts, press the Enter key. (The
middle screen in Figure 5-22)
Note Step 4: The next screen (The bottom screen in Figure 5-22)
appears and the printer automatically performs the
cleaning (level: CL1).

Figure 5-21. Screw Securing the Head Fixing Plate on the Left

Adjustment

Adjustments

143

EPSON Stylus Color 900

Revision C
13. The following screen appears and the carriage automatically moves
toward the 80th column.

D id y o u lo o s e n th e s c r e w o n th e le ft s id e o f th e C R ?
Y e s
N o

In c a s e o f 1 s t p r in t:
1 . A fte r
2 . p u s h
3 . P le a s
th e E
4 . T h e h

A fte r it ta k e s 3 m in u te s .
E s c : P r e v io u s

U p /D o w n a r r o w s : S e le c t

y o u h a v e m o
th e c o lo r I/C
e g e n tly tig h
n te r k e y .
e a d a n g u la r

v e d th e a n g u la r a d ju s tm e n t le v e r ,
fr o m fr o n t s id e b y u s in g fin e d r iv e r o r tw e e z e r s .
te n th e s c r e w s th e r ig h t s id e a t fir s t, a n d p r e s s
a d ju s tm e n t p a tte r n w ill b e p r in te d .

E n te r: O K
E n te r: O K

D id y o u lo o s e n th e s c r e w o n th e le ft s id e o f th e C R ?

Figure 5-23. Screen after “Head Angular Adjustment” is Selected
Y e s
N o

14. Loosen the screw securing the head fixing plate on the right side of
the carriage unit by turning it 90 ° - 180°. (Do not remove it
completely.)

T h e p r in te r h a s b e e n le ft a lo n e fo r 3 m in u te s . T h e p u m p , A S F m o to r
h a s n 't b e e n p r o p e r ly m a g n e t iz e d , a n d c a r r ia g e w ill n o t m o v e .
P le a s e p r e s s th e E n te r k e y .

E s c : P r e v io u s

U p /D o w n a r r o w s : S e le c t

S c r e w ( r ig h t) s e c u r in g th e H e a d F ix in g P la te

E n te r: O K

C a p u n it

P re s s th e E n te r k e y .
N o w p e rfo rm

C L 1 in o r d e r t o r e c o v e r t h e m o t o r 's m a g n e t iz e d s t a t e .

C L 1 ta k e s a b o u t 9 0 s e c o n d s , a n d a ll k e y s a r e ig n o r e d d u r in g th is o p e r a tio n .

Figure 5-24. Screw Securing the Head Fixing Plate on the Right
Figure 5-22. Recovery from Unmagnetized Status
15. Press the Enter key in the screen (Figure 5-23).

Adjustment

Adjustments

144

EPSON Stylus Color 900

Revision C

NOTE:

16. The following screen appears.

During the step 12 onward, the printhead is left away from the
capping position. Therefore, please make this adjustment as fast as
possible to prevent the printhead surface from drying. Otherwise,
you will spend extra time on solving the print problem as a result.

In c a s e o f 1 s t p r in t:
1 . A fte r
2 . p u s h
3 . P le a s
th e E
4 . T h e h

y o u h a v e m o
th e c o lo r I/C
e g e n tly tig h
n te r k e y .
e a d a n g u la r

v e d th e a n g u la r a d ju s tm e n t le v e r ,
fr o m fr o n t s id e b y u s in g fin e d r iv e r o r tw e e z e r s .
te n th e s c r e w s th e r ig h t s id e a t fir s t, a n d p r e s s

18. Press the Enter key in the screen (Figure 5-25).

a d ju s tm e n t p a tte r n w ill b e p r in te d .

19. The printer runs the Head Angular Adjustment Pattern. The
following screen appears.
E n te r: O K

Figure 5-25. Prompt to Move the Angular Adjustment Lever
17-1.

At first, set the angular lever to the center position. (As the
center value is marked with the protrusion, it can be easily
found.)

17-2.

Push the color I/C from the front side to eliminate tolerance by
using a fine driver of tweezers.

17-3.

Gently tighten the right side screw at first, then gently tighten the
left side screw.

R e - A d ju s tm e n t
E n d

D o n o t e je c t a p a p e r u n t il y o u 'v e p r in t e d o u t 5 p a t t e r n s .
A n d s e le c t o u t th e b e s t p a tte r n a n d le v e r s ta te .

E s c : U p /D o w n a r r o w s : S e le c t

E n te r: O K

Figure 5-27. Prompt to Move the Angular Adjustment Lever
A n g u la r L e v e r C e n te r p o s itio n

20. Select “Re-Adjustment” in the screen (Figure 5-27).

Figure 5-26. Setup for the Head Angular Adjustment Lever

Adjustment

Adjustments

145

EPSON Stylus Color 900

Revision C

21. The screen automatically advances to the screen shown in Figure
5-28.

22. Perform the same operation as the step 17-2 and 17-3.
23. Press the Enter key in the screen shown in Figure 5-28.

P le a s e b e s u r e n o t to m o v e th e C R d u r in g a n y o p e r a tio n in th is a d ju s tm e n t.

In c a s e o f 1 s t p r in t:
1 . A fte r
2 . p u s h
3 . P le a s
th e E
4 . T h e h

y o u h a v e m o
th e c o lo r I/C
e g e n tly tig h
n te r k e y .
e a d a n g u la r

v e d th e a n g u la r a d ju s tm e n t le v e r ,
fr o m fr o n t s id e b y u s in g fin e d r iv e r o r tw e e z e r s .
te n th e s c r e w s th e r ig h t s id e a t fir s t, a n d p r e s s
a d ju s tm e n t p a tte r n w ill b e p r in te d .

In c a s e o f o th e rs (2 n d , 3 rd , 4 th , 5 th ):
1 . L o o s e n b o th s c re w s .
2 . O b e y a b o v e s te p s (1 to 4 ).

E n te r: O K

Figure 5-28. Re-adjustment Screen
Then, move down (forward) the angular lever one step from the
center position after you loosen the two screws.

A n g u la r L e v e r C e n te r p o s itio n

24. The printer runs the Head Angular Adjustment Pattern. The screen
shown in Figure 5-27 appears again.
25. Repeat Step 20 through Step 24 three more times and print 5
patterns on one page of A4 paper in sequence.
26. After printing 5 patterns, the printer ejects the sheet and the
program automatically returns to the screen shown in Figure 5-27.
27. From the 5 output check patterns, select the most desirable one
based on the reference patterns given in Figure 5-17 and Figure
5-18, and ensure the angular lever position for the selected pattern.
28. In the screen shown in Figure 5-27, select “Re-Adjustment” and set
the angular lever to the position selected as the most suitable in
Step 27. The screen returns to the condition shown in Figure 5-28.
29. In the screen (Figure 5-28), press the Enter key.
30. The printer prints with the angular lever set to the selected position.
The pattern, however, remains in the lower part of the mechanism
frame and can not be seen. The screen changes to the condition
shown in Figure 5-27.

NOTE:
Do not eject the sheet used in Step 30 by pressing the Eject button
to check the pattern. If you do so, mismatching between the
firmware and the special command for the adjustment will occur,
which causes the carriage to move irregularly.

O n e n o tc h d o w n

31. In the screen (Figure 5-27), select “End”.

Figure 5-29. Moving the Head Adjustment Lever

Adjustment

Adjustments

146

EPSON Stylus Color 900

Revision C

32. The following screen appears.

R e s e ttin g h a r d w a r e n o w .

3 0
> * * D o n 't u s e a n y c o m m a n d s u n t il t h e C R 's m o t io n is c o m p le t e d . * * <

E n te r: O K

Figure 5-30. Head Angular Adjustment End Sequence
33. The printer turns off in an instant. This sequence, called Hardware
Reset, takes approximately 30 seconds to execute. During this
sequence, the programs shows countdown and the message
indicating restriction on any action using the program and
generating commands.

NOTE:
The Hardware Reset performed here, which initializes the carriage
location management, is considered very important, because there
is a possibility that the print position changes slightly during the
adjustment.
34. The screen returns to Head Angular Adjustment Initial screen
(Figure 5-14) and the next adjustment can be selected.

Adjustment

Adjustments

147

EPSON Stylus Color 900

Revision C

5.2.5 Bi-Directional Adjustment

4. Select “Print the Bi-D adjustment pattern” in the screen.

This section describes how to make Bi-Directional Adjustment. This
adjustment must be made under the following conditions.

5. The following screen appears.

NOTE:

1. The printhead has been replaced/removed.

The following three items are adjusted with the Bi-D Adjustment.

2. Vertical lines are not aligned. (A print problem has occurred.)

1. Variable dot (forms small/middle dots)
2. Variable dot (forms normal dots)
3. Normal dot only

3. C265 Main Board has been replaced.
4. When the ROM (version TEE012A, 01B, or 01C) is replaced
with the revised one (TEE01D or newer). (See Section 5.2.3 for
details.)

NOTE:

P r in t
V a r ia b le - 1
V a r ia b le - 2
N o rm a l D

Bi-Directional Adjustment value is not cleared with EEPROM
Initialization (resetting the protection counter and specific
addresses).

th
D
D
o

e B
o t:
o t:
t: p

i- d
p re
p re
re s

a d
s e
s e
e n

ju
n t
n t
t d

s tm e n t p a tte rn fo r p re s e n t d a ta
d a ta -2 , p re s e n t d a ta , p re s e n t d a ta + 2
d a ta -2 , p re s e n t d a ta , p re s e n t d a ta + 2
a ta -2 , p re s e n t d a ta , p re s e n t d a ta + 2

1. Referring to Section 5.2.1, perform the preliminary operation.
2. Select “Adjustment 2” from the main adjustment menu (Figure 5-4)
then “Bi-Directional Adjustment”.
3. The following screen appears.

E S C : P r e v io u s

E n te r: O K

Figure 5-32.
Screen after “Print the Bi-D adjustment pattern” is Selected

B i- D ir e c tio n a l A d ju s tm e n t

6. Press the Enter key.
P r in t th e B i- D a d ju s tm e n t p a tte r n

7. The following screen appears and the printer runs the Bi-D
adjustment pattern consequently.

A d ju s t
C h e c k p r e s e n t a d ju s tm e n t

E S C : P r e v io u s

U p /D o w n a r r o w s : S e le c t

E n te r: O K

Figure 5-31. Bi-Directional Adjustment Screen

Adjustment

Adjustments

148

EPSON Stylus Color 900

Revision C

V a r ia b le - 1 D o t B i- d D a ta = - 2

V a r ia b le - 1 D o t B i- d D a ta = 0

B i- d p a tte r n is b e in g p r in te d o u t n o w .

V a r ia b le ( S m a ll a n d M id d le d o t)

V a r ia b le - 1 D o t B i- d D a ta = 2

E S C : P r e v io u s

V a r ia b le - 2 D o t B i- d D a ta = - 2

E n te r: O K

Figure 5-33. Screen during the Bi-D Adjustment Pattern Print
8. A Bi-D adjustment pattern includes items shown in the sample in
Figure 5-34 in the right column.
9. While the Bi-D adjustment pattern is running, the screen returns to
the Bi-Directional Adjustment screen (Figure 5-31).
10. Among the patterns for each of 3 items, select the value for the most
closely aligned vertical line. Note if none of the lines is completely
aligned, you can select the value for the most closely aligned
pattern. The centre value for the next adjustment pattern print will be
replaced accordingly.

V a r ia b le - 2 D o t B i- d D a ta = 0

N o r m a l D o t ( S in g le , D o u b le , e tc .)

V a r ia b le - 2 D o t B i- d D a ta = 2

N o r m a l D o t B i- d D a ta = - 2

N o r m a l D o t B i- d D a ta = 0

N o r m a l D o t O n ly

N o r m a l D o t B i- d D a ta = 2

Figure 5-34. Bi-D Adjustment Pattern Sample

Adjustment

Adjustments

149

EPSON Stylus Color 900

Revision C

11. Select “Adjust” in the screen.

15. As the Up/Down Arrow key is pressed, the value (shown in blue in
the figure) increases/decreases. So you can select the desirable
value.

12. The following screen appears.

NOTE:
Regardless of the value you have input, the center value (selected
value) in the next Bi-D pattern sample will be “0”. The value in the
range from -34 to 34 can be input.

M o d e s e le c tio n o f B i-d a d ju s tm e n t

V a r ia b le -1 D o t
V a r ia b le -2 D o t
N o rm a l D o t

E S C : P r e v io u s

U p /D o w n a r r o w s : S e le c t

16. When the desirable value is selected, press the Enter key. The
following screen appears.

E n te r: O K
V a r ia b le - 1 D o t B i- D

a d ju s tm e n t

A s th e v a r ia b le - 1 D o t d a ta , + 4 h a s b e e n w r itte n in E E P R O M .

Figure 5-35. Bi-D Adjustment Mode Selection Screen
13. Select “Variable-1 Dot”. (If the center value for the Variable-1 Dot
pattern has the completely aligned lines, you can select “Variable-2
Dot” instead.)

E S C : P r e v io u s

14. The following screen appears.

Figure 5-37. Screen after the Adjustment Value has been Written
V a r ia b le - 1 D o t B i- D a d ju s tm e n t
S e le c t a n a d ju s tm e n t v a lu e w ith th e U p /D o w n a r r o w k e y s .
4

17. Press the ESC key to return to the Bi-D Adjustment mode selection
screen (Figure 5-35).
18. Select “Variable-2 Dot”. (If the center value for the Variable-2 Dot
pattern has the completely aligned lines, you can select “Normal
Dot” instead.)

E S C : P r e v io u s

U p /D o w n a r r o w s : S e le c t

E n te r: O K

19. The following screen appears.

Figure 5-36. Adjustment Value Input Screen (Variable-1)

Adjustment

Adjustments

150

EPSON Stylus Color 900

Revision C
22. Press the ESC key to return to the Bi-D Adjustment mode selection
screen (Figure 5-35).

V a r ia b le - 2 D o t B i- D a d ju s tm e n t

23. Select “Normal Dot”. (If the center value for the Normal Dot pattern
has the completely aligned lines, you can finish this adjustment.)

S e le c t a n a d ju s tm e n t v a lu e w ith th e U p /D o w n a r r o w k e y s .
4

24. The following screen appears.

E S C : P r e v io u s

U p /D o w n a r r o w s : S e le c t

E n te r: O K

N o r m a l D o t B i- D

a d ju s tm e n t

S e le c t a n a d ju s tm e n t v a lu e w ith th e U p /D o w n a r r o w

Figure 5-38. Adjustment Value Input Screen (Variable-2)

k e y s .

4

20. As the Up/Down Arrow key is pressed, the value (shown in blue in
the figure) increases/decreases. So you can select the desirable
value.
E S C : P r e v io u s

NOTE:
Regardless of the value you have input, the center value (selected
value) in the next Bi-D pattern sample will be “0”. The value in the
range from -34 to 34 can be input.

E n te r: O K

Figure 5-40. Adjustment Value Input Screen (Normal Dot)
25. As the Up/Down Arrow key is pressed, the value (shown in blue in
the figure) increases/decreases. So you can select the desirable
value.

21. When the desirable value is selected, press the Enter key. The
following screen appears.

N o r m a l D o t B i- D

U p /D o w n a r r o w s : S e le c t

NOTE:

a d ju s tm e n t

Regardless of the value you have input, the center value (selected
value) in the next Bi-D pattern sample will be “0”. The value in the
range from -34 to 34 can be input.

A s th e N o r m a l D o t d a ta , + 4 h a s b e e n w r itte n in E E P R O M .

26. When the desirable value is selected, press the Enter key.
E S C : P r e v io u s

Figure 5-39. Screen after the Adjustment Value has been Written

Adjustment

Adjustments

151

EPSON Stylus Color 900

Revision C

27. The following screen appears.

N o r m a l D o t B i- D a d ju s tm e n t
A s th e v a r ia b le - 1 D o t d a ta , + 4 h a s b e e n w r itte n in E E P R O M .

E S C : P r e v io u s

Figure 5-41. Screen after the Adjustment Value has been Written
28. To execute the adjustments, press the ESC key 5 times. The printer
turns off and back on in an instant and the adjustment values are
stored in the EEPROM. If you need to check the adjustment results,
perform the following operation.
1. Market Destination Check:
Press the ESC key twice and select “Market Destination
Check” from the menu.
2. Print A 4 Pattern:
Press the ESC key three times and select “Print A4 Pattern”
from “SERVICE ITEMS”.

NOTE:
Bi-Directional Adjustment is the last adjustment to be made on the
program. Never perform adjustments such as “Head Angular
Adjustment” and “Head Actuator Voltage ID Input” after “BiDirectional Adjustment”. (Refer to Table 5-1 for details.)

Adjustment

Adjustments

152

EPSON Stylus Color 900

Revision C

5.2.6 Printhead Cleaning Using the Program

5. The following screen appears.

The service program for the Stylus Color 900 has the cleaning function.
The command is always executed with the most powerful cleaning
mode. Note the printer is not equipped with the dummy cleaning called
CL3. Therefore, you can attempt to solve the nozzle clogging problem
by pressing the Cleaning button on the control panel repeatedly.

M o d e s e le c tio n o f th e h e a d c le a n in g

< < P o w e r fu l c le a n in g ( C L 2 ) w ill b e d o n e in th is m o d e .> >

1. Referring to Section 5.2.1, perform the preliminary operation.
H e a d c le a n in g p e r fo r m

2. Select “Maintenance” from the main adjustment menu.
3. The following screen appears.
E s c : P r e v io u s

************

E P S O N

S ty lu s C O L O R

< < M a in te n a n c e

H e
In k
In d
F a

a d
C h
ic a
n C

C le
a rg
tio n
h e c

9 0 0 S E R V IC E P R O G R A M

V e r s io n 1 .0

**************

Figure 5-43. Cleaning Screen

> >

a n in g
e F la g R e s e t
o f th e c o u n te r v a lu e fo r th e W a s te In k P a d
k

E s c : Q u it

E n te r: O K

U p /D o w n a rro w s :

S e le c t

6. Press the Enter key.
7. To run the cleaning again, press the ESC key once to return to the
main maintenance menu and select “Head Cleaning”.

E n te r: O K

Figure 5-42. Main maintenance Menu Screen
4. Select “Head Cleaning”.

Adjustment

Adjustments

153

EPSON Stylus Color 900

Revision C

5.2.7 Initial Ink Charge

6. Select “Yes”.

This section describes how to perform Initial Ink Charge. It must be
performed under the following conditions.

7. The following screen appears.

1. C265 Main Board has been replaced.
2. The printhead has been removed. (Be sure to perform Ink
Cartridge Replacement Sequence before performing Initial Ink
Charge.
3. Nozzles are badly clogged. (Cleaning using the program and
control panel has been done, but the nozzles are still clogged.)

< < W r itin g in itia l in k c h a r g e fla g is c o m p le te d . > >

******
If y o u
tu rn o
a n e w
o p e ra
******

T u r n o ff th e p r in te r o n c e a n d " w a it fo r 1 0
**************************************************
w a n t to p e r fo r m in itia l in k c h a r g e w ith a n e w
ff th e o p e r a te - S W a n d r e p la c e th e c u r r e n t in
o n e . T h e n in itia l in k c h a r g e w ill s ta r t b y p r e
te - S W a g a in .
**************************************************

s e c o n d s "
******************
in k c a r tr id g e ,
k c a r tr id g e w ith
s s in g th e
******************

It ta k e s a b o u t 8 8 s e c o n d s .

> * * D o n 't u s e a n y c o m m a n d s u n t il I n it ia l I n k C h a r g e c o m p le t e s . * * <

1. It is advisable that the currently installed ink cartridges be replaced
with new ones. (If ink runs out during the operation, Initial Ink charge
begins again when a new I/C is installed.)

E s c : P r e v io u s

Figure 5-45. Message during Ink Charge Flag Reset Operation

2. Referring to Section 5.2.1, perform the preliminary operation.
3. Select “Maintenance” from the main adjustment menu.

8. Turn the printer off.

4. Select “Ink Charge Flag Reset”.

9. Leave the printer as it is for 10 seconds.

5. The following screen appears.

10. Turn the printer back on. The printer performs Initialization and then
Initial Ink Charge in sequence.

D o y o u w a n t to r e s e t th e in itia l in k c h a r g e fla g ?

Y e s
N o
- - B e c a r e fu l o f in k c o n s u m p tio n - N o te th a t 1 /7 0 ( B k ) , 3 /1 0 ( Y M C ) o f n o n - u s e d in k c o n s u m e d b y o n e tim e .
* * P e rfo rm

th is o p e r a tio n a fte r in s ta llin g b o th n e w

in k c a r tr id g e s . * *

In itia l In k C h a r g e - - - - >
P e r fo r m th e in itia l in k c h a r g e .
[ T o ta l q u a n tity o f b la c k in k a b s o r p tio n = 4 .3 m l ]
[ T o ta l q u a n tity o f c o lo r in k a b s o r p tio n = 6 .3 m l ]

E s c : P r e v io u s

U p /D o w n a r r o w s : S e le c t

E n te r: O K

Figure 5-44. Screen after “Ink Charge Flag Reset” is Selected

Adjustment

Adjustments

154

EPSON Stylus Color 900

Revision C

5.2.8 Indication of the Counter Value for the Waste Ink Pad
This section describes how to indicate and clear the values for the
waste ink pad counters (protection counters) which shows the total ink
amount absorbed in the waste ink pads. In case of Stylus Color 900,
you can confirm and reset the counter values through the printer’s
control panel operation only. This manual, however, only describes the
procedure using the service program.

5. The following screen appears.

< < W r itin g in itia l in k c h a r g e fla g is c o m p le te d . > >

******
If y o u
tu rn o
a n e w
o p e ra
******

1. Referring to Section 5.2.1, perform the preliminary operation.
2. Select “Indication of the counter value for the waste ink pad” from
the main maintenance menu.

T u r n o ff th e p r in te r o n c e a n d " w a it fo r 1 0
**************************************************
w a n t to p e r fo r m in itia l in k c h a r g e w ith a n e w
ff th e o p e r a te - S W a n d r e p la c e th e c u r r e n t in
o n e . T h e n in itia l in k c h a r g e w ill s ta r t b y p r e
te - S W a g a in .
**************************************************

s e c o n d s "
******************
in k c a r tr id g e ,
k c a r tr id g e w ith
s s in g th e
******************

It ta k e s a b o u t 8 8 s e c o n d s .

> * * D o n 't u s e a n y c o m m a n d s u n t il I n it ia l I n k C h a r g e c o m p le t e s . * * <
E s c : P r e v io u s

3. The following screen appears.
Figure 5-47. Protection Counter Indication Screen
P r o te c tio n c o u n te r C H E C K /C L E A R

C h e c k th e p r o te c tio n c o u n te r v a lu e s
C le a r th e p r o te c tio n c o u n te r v a lu e s

6. The maximum values for the left and right pads are 25,800 and
23,300 points, respectively. If any of the current values is close to
the limit, the protection counter values should be reset to “0”. Please
be aware that the replacement timing shown in Figure 5-47 only
indicates the reference values. To clear the counters, continue to
Step 7.

NOTE:
E s c : P r e v io u s

U p /D o w n a r r o w s : S e le c t E n te r : O K

Figure 5-46.
Initial Protection Counter Screen - Check/Clear Selection
4. Select “Check the protection counter values”.

Adjustment

Before clearing the protection counters, be sure to replace the
waste ink pads with new ones. Otherwise, the user may encounter
ink leakage.
7. Disconnect the printer from the PC and replace the waste ink pads
with new ones, referring to Chapter 6 “Maintenance”.
8. Referring to Section 5.2.1, perform the preliminary operation. Then
select “Maintenance” from the main adjustment menu and next
“Indication of the counter value for the waste ink pad”.

Adjustments

155

EPSON Stylus Color 900

Revision C

9. Select “Clear the Protection Counter Value”.

12. The following screen appears.

10. The following screen appears.
N o w c le a r in g th e p r o te c tio n c o u n te r !

< < T h e p r o te c tio n c o u n te r h a s b e e n r e s e t to z e r o . > >

T h e w a s te in k p a d s m u s t b e r e p la c e d b e fo r e c le a r in g th e c o u n te r .

C h e c k th e c o u n te r b y p r e s s in g th e E S C k e y tw ic e .

A lr e a d y r e p la c e d
H a v e n o t r e p la c e d

E s c : P r e v io u s

E s c : P r e v io u s

U p /D o w n a r r o w s : S e le c t:

E n te r: O K

Figure 5-49. Protection Counter Clear End Screen
Figure 5-48.
Selection Menu before Clearing the Protection Counter

13. Press the ESC key twice to return to the initial protection counter
screen (Figure 5-46).

11. Select “Already replaced”. If you have selected “Have not replace”
because you have not replaced the waste ink pads, the screen
returns to the initial protection counter screen (Figure 5-46).

Adjustment

14. Select “Check Protection Counter” to verify the right and left ink pad
counter values are both “0”.

Adjustments

156

EPSON Stylus Color 900

Revision C

5.2.9 Fan Check
This program enables you to check the fan’s operational condition. In
the Stylus Color 900, the fan does not necessarily rotate when the
printer is turned on. Therefore, if the Head Hot Error (indication on the
panel: Ink Out Error) occurs frequently, the fan must be checked for its
condition.

R e fe r to C h a p . 5 in S e r v ic e m a n u a l

1. Referring to Section 5.2.1, perform the preliminary operation.
2. Select “Fan Check” from the main maintenance menu.
E s c : P r e v io u s

3. The following screen appears.

Figure 5-51.
Screen after “No” is Selected due to Fan’s Malfunction
Is th e fa n o p e r a tio n O K ?
Y e s
N o

E s c : P r e v io u s

U p /D o w n a r r o w s : S e le c t

E n te r: O K

Figure 5-50. Screen after “Fan Check” is Selected
4. As the screen (Figure 5-50) appears, the cooling fan starts rotating.
If the fan is rotating properly, select “Yes”, and the fan stops
rotating.
5. If “No” is selected because the fan does not rotate, the following
screen appears. In this case, refer to the Service Manual / Chapter 3
“Troubleshooting” / “Fan does not rotate”, as the message prompts.

Adjustment

Adjustments

157

EPSON Stylus Color 900

Revision C

5.2.10 Paper Gap Adjustment

2. Install dummy cartridges (empty cartridges) and close the both
clamps.

Paper Gap Adjustment is performed to provide a proper gap between
the printhead surface and paper surface. It must be made under the
following conditions. (This adjustment can not be made without
removing the upper case.)
1. Any of the following operations which involve carriage guide
shaft removal has been performed.
- Replacing the carriage guide shaft
- Replacing the felt oil pad at the back of the carriage
(when supplying O-8 oil)
- Replacing the carriage unit

3. Set the PG lever (blue) to the rear (PG = wider).
4. If the carriage is locked, release the carriage lock from the back of
the printer mechanism.
5. Move the carriage to the center and place the thickness gauge
(Specifications: 1.14 mm, 5 cm in length) over the right end of the
Front Paper Guide’s top surface.
F r o n t P a p e r G u id e

2. Right/left parallelism adjustment bushing has been moved,
removed or replaced.
1. Set the right and left parallelism adjustment bushings to the middle
position of the corresponding adjustable range. Make sure the
screws fixing the parallelism adjustment bushings are loosened for
this operation.
P a r a lle lis m A d ju s tm e n t
B u s h in g ( L e ft)
C e n te r v a lu e in th e
a d ju s ta b le r a n g e

T h ic k n e s s G a u g e ( 1 .1 4 m m )

P a r a lle lis m A d ju s tm e n t
B u s h in g ( R ig h t)

C a p U n it

Figure 5-53. Setting Position of the Thickness Gauge
6. Bring the PG lever (blue) back to the front (PG = narrower).
7. By pulling the timing belt manually, move the carriage to the position
where the thickness gauge is set.

NOTE:
F ix in g S c r e w s

Figure 5-52.
Right and Left Parallelism Adjustment Bushing Locations

Adjustment

Do not push the carriage unit directly to move it. Doing so presses
the carriage down and the paper gap adjustment is not correctly
done.
8. When the printhead is in contact with the thickness gauge, check if
the thickness gauge moves.

Adjustments

158

EPSON Stylus Color 900

Revision C

9. If the thickness gauge does not move, move the right parallelism
adjustment bushing upward by one notch. The direction for moving
the bushing and corresponding change in PG amount is as shown in
the following figure.

13. By pulling the timing belt, move the carriage again to the position
where the thickness gauge is set and make sure the thickness
gauge does not move.
14. Place the thickness gauge on the 80th column position and adjust
the with the left parallelism adjustment bushing in the same manner
as for the right parallelism adjustment bushing.

NOTE:

P G : N a rro w e d

Make sure the PG lever (blue) is set properly depending on the
operation as shown below:





P G : W id e n

During the adjustment:
Set to the front (PG = narrower)
When moving the carriage away from the thickness gauge:
Set to the rear (PG = wider)

15. Set the PG lever (blue) to the rear (PG = wider).

Figure 5-54.
Bushing’s Movement and Corresponding Change in PG Amount

NOTE:

16. Place the thickness gauge on the right side of the rib in the Front
Paper Guide again.
17. Set the PG lever (blue) to the front (PG = narrower).

Be sure to release the parallelism adjustment bushing (right/left)
from the frame before turning it. Otherwise, the teeth may crush and
the adjustment can not be done.
10. Repeat the steps from 3 to 9 until the thickness gauge moves being
pushed by the printhead.

18. By pulling the timing belt manually, move the carriage to the position
where the thickness gauge is set and make sure the thickness
gauge does not move.
19. Turn the right parallelism adjustment bushing upward by one notch
and ensure the thickness gauge moves.

11. When the thickness gauge starts moving, move the carriage away
from the thickness gauge set by pulling the timing belt. (The
carriage moves back to the left.)

20. Return the right parallelism adjustment bushing to the previous
position by turning it downward by one notch.

12. Push the right parallelism adjustment bushing down from the current
position by one notch.

21. If the results of the steps 18 and 19 are incorrect, make the PG
adjustment using the left bushing again.

Adjustment

Adjustments

159

EPSON Stylus Color 900

Revision C

22. Holding the right parallelism adjustment bushing with your hand so it
does not move, fasten the screw.
23. Holding the left parallelism adjustment bushing with your hand so it
does not move, fasten the screw.
24. Remove the thickness gauge.
25. If the linear scale is dislocated, set it through the photo sensor at the
back of the carriage.
26. Move the carriage to the right.
27. Install the upper case.

Adjustment

Adjustments

160






MAINTENANCE

EPSON Stylus Color 900

Revision C

6.1 Overview

6.1.1 Maintenance

This section describes how to solve problems when a printing
malfunction or maintenance request error has occurred. Observe the
instructions below to perform servicing appropriately. For solutions for
any other error conditions, refer to Chapter 5 “Troubleshooting”.

W A R N IN G

C A U T IO N

When a printing malfunction or Maintenance request error has
occurred, take appropriate measures described in the following sections
to solve the problem.

This C265 Main board in this printer has a lithium
battery on it. Observe the instructions below when
handling the battery.

 Do not short-circuit the battery’s electrodes.

 Mount the battery with its polarity in the right
direction, or it may explode.

 Do not expose the battery to flames or excessive
heat.











Unplug the power cable from the AC power inlet
before cleaning the printer.
Never apply solvents such as thinner,
trichloroethylene, or keton to clean the printer main
body. Use of a soft clean cloth is recommended. For
severe stain on the case, use thinned neutral
detergent. Wet a cloth with detergent and wring the
detergent well out of the cloth.
Do not use a hard brush for cleaning, or it may
scratch the case.
Be careful no to damage any interior parts when
cleaning inside the printer.

Maintenance

Overview

162

EPSON Stylus Color 900

Revision C

6.1.1.1 Cleaning the Printhead
C le a n in g M e th o d

If your printout shows problems such as white banding, color banding,
dot missing, or improper ink ejection (bad alignment), the printhead
needs to be cleaned. The cleaning methods equipped with the Stylus
Color 900 are as shown in Figure 6-1.

C A U T IO N

L e v e l 1
C le a n in g u s in g
th e c o n tro l p a n e l

If printing results get worse all the more you repeat
cleaning, it is assumed that the ink cartridge has run
out the ink and the ink consumption counter is upset
due to a user’s mishandling the ink cartridge. In this
case, enter the ink cartridge replacement sequence
and replace the installed ink cartridge with a new one.

C le a n in g u s in g
th e p ro g ra m
L e v e l 2

L e v e l 3

P re s s th e
C le a n in g B u tto n

P e r fo r m c le a n in g
w ith th e fo r c ib le C L 2 .

C le a n in g u s in g th e
In itia l In k C h a r g e .

P e r fo r m c le a n in g
a c c o r d in g to th e
C L c o u n te r.

S e le c t " C le a n in g "
in th e p r o g r a m .

R e s e t th e in itia l in k c h a r g e
fla g in th e p r o g r a m .

C L 2 ( p o w e r fu l) is
a lw a y s u s e d fo r th e
c le a n in g .

T u r n th e p r in te r o ff.

R u n a s e lf- te s t.

N o

R u n a s e lf- te s t.

Is th e
p r o b le m
s o lv e d ?
Y e s

R u n a s e lf- te s t.
N o

E N D

T u r n th e p r in te r b a c k o n to
p e r fo r m In itia l In k C h a r g e .

Is th e
p r o b le m
s o lv e d ?
N o

Y e s
E N D

Is th e
p r o b le m
s o lv e d ?
Y e s
E N D

Figure 6-1. Printhead Cleaning Options

Maintenance

Overview

163

EPSON Stylus Color 900

Revision C

6.1.1.2 Maintenance Request Error
The Maintenance Request Error is indicated when the waste ink
absorber located in the lower case becomes near full. The table below
shows methods and procedures necessary to clear the Maintenance
Request Error.

Table 6-1. Solution for the Maintenance Request Error
No.

Options

Description

Reference

1

Using the control
panel

• Reset waste ink counter.
NOTE:
Unlike other printers, the waste
ink counter reset operation is
not common to Timer IC nor I/F
selection reset.

Chapter 1 / Section
1.4

2

Using the program

• Waste ink count reset

Chapter 5 / Section
5.2.8.

C A U T IO N






Be sure to replace the waste ink pads before or after
clearing the Maintenance Request Error. Otherwise,
your customer may encounter ink overflow.
The maximum counter value for each pad is as
follows:
Left pad: 35800, Right pad: 33300
However, the adjustment program urges to set 25800
(left) and 23,300 (right) as a reference values for pad
replacement. (10,000 points is deducted from each
maximum value.)

Maintenance

Overview

164

EPSON Stylus Color 900

Revision C

6.2 Lubrication and Adhesion
C A U T IO N




The types lubricants used in the Stylus Color 900 are specified by
SEIKO EPSON. Lubricate the printer if necessary under the following
conditions;








Oil has been wiped off during cleaning.
Printer has been disassembled/assembled.
Specific part(s) in the printer has been replaced.

For a specific feature of ink jet printers, an oil pad(s) must be lubricated
with a special care. Observe the instructions below and perform
lubrication by strictly following the specified lubricants type, amount,
and the way to apply.

C A U T IO N








Never add oil to the currently used oil pad. Be sure to
supply specified amount of oil to a new oil pad.
Otherwise, too much oil will be absorbed, which
damages the printhead.
Pay special attention in handling “O8” so the
printhead is not smeared with it.
Never apply oil directly to the carriage shaft guide. Be
sure to remove the printhead unit and the carriage
unit before replacing the current oil pad with a new
one and then supplying oil to the new pad.
Accordingly, you need to perform any necessary head
related adjustment. (Refer to Chapter 5.)

Maintenance

Lubrication and Adhesion

When installing the carriage guide shaft after oiling
the oil pad, be sure to clean the shaft and perform the
preliminary lubrication before installing the shaft as
described below:
1. Using a dry cotton cloth, wipe off the oil on the
carriage guide shaft surface well to remove dirt
completely.
2. Using the dry cotton cloth, clean the inner
surfaces of the metallic bushings on the carriage
unit through which the shaft is inserted. (To
remove iron pieces)
3. Get a new oil pad and supply “O8” (0.5 cc) into it.
4. Using the oiled side of the pad, lubricate over the
whole surface of the carriage guide shaft well.
5. Install another new oil pad to the specified
position at the back of the carriage.
6. Supply specified amount of “O8” (0.7 cc to 0.75
cc) to the installed oil pad. Make sure the
printhead has been removed for this operation.

NOTE:For precise oil control, use the smallestdiameter syringe available. Also, never use the
syringe without a needle on it.

165

EPSON Stylus Color 900

Revision C

6.2.1 Lubricating the Carriage Guide Shaft
This section includes the procedure for lubricating the carriage guide
shaft. Unlike other models, the lubrication of the carriage guide shaft is
performed under many restrictions. Therefore, be sure to observe the
CAUTION in the previous section and perform lubrication by strictly
following the steps specified.

5. Using the dry cloth, completely wipe the inner surfaces of the 2
metallic bushings through which the carriage guide shaft is set.
Especially, wipe well off black stains if any. Also, clean the portion
where the pad was attached using the cloth.
O il P a d

1. Remove the printhead. (Refer to 4.2.7.1.)
2. Remove the carriage unit. (Refer to 4.2.7.10.)

W ip e o ff b la c k
s ta in s c o m p le te ly .

3. Clean the carriage shaft by wiping the shaft’s surface with a dry
cloth.

M e ta llic b u s h in g s
C a r r ia g e G u id e S h a ft

Figure 6-3. Locations for Oil Pad and Bushings
6. Get a smallest-diameter syringe available. The small syringe shown
below only contains 2 cc maximally.

D r y c lo th

Figure 6-4. Small Syringe

Figure 6-2. Cleaning the Carriage Guide Shaft
C A U T IO N

4. Remove the Oil Pad (a felt pad) from the back of the carriage unit.

Maintenance

Be sure to use a small-diameter syringe to minimize
the tolerance. Small syringe allows you to see pushed
amount (stroke) more clearly.

Lubrication and Adhesion

166

EPSON Stylus Color 900

Revision C

7. Get 2 new oil pads.

11. Using the same syringe used in Step 8, supply “O8” (0.7 to 0.75 cc)
to the installed oil pad.

8. To one of the new oil pads, supply “O8” (0.5 cc) using the small
syringe.
0 .7 - 0 .7 5 c c

S u p p ly " O 8 " ( 0 .5 c c ) to th e o il p a d .

Figure 6-7. Supplying Oil to the Oil Pad (2)

Figure 6-5. Supplying Oil to the Oil Pad (1)
9. Using the oiled side of the pad (step 8), lubricate the carriage guide
shaft surface thoroughly.
O il P a d a lr e a d y o ile d w ith " O 8 " ( 0 .5 c c )

12. Install the carriage guide shaft to the carriage unit then to the printer
main body. (See Chapter 4 / Section 4.2.7.10.)
13. Install the printhead. (See Chapter 4 / Section 4.2.7.1.)
14. Perform Paper Gap Adjustment. (See Chapter 5 / Section 5.2.10.)
15. Turn the printer on without the ink cartridges installed to cause the
Ink Cartridge Out Error.
16. Using the Load/Eject button, run the Ink Cartridge Replacement
Sequence and install new ink cartridges.
17. Using the service program, perform Initial Ink Charge. (See Chapter
5 / Section 5.2.7.)

Figure 6-6. Preliminary Lubrication with “O8”

18. Perform Head Angular Adjustment. (See Chapter 5 / Section 5.2.4.)
19. Perform Bi-Directional Adjustment. (See Chapter 5 / Section 5.2.5.)

10. Install the other new oil pad to the specified position at the back of
the carriage.

Maintenance

Lubrication and Adhesion

167

EPSON Stylus Color 900

Revision C

Table 6-2. Oil Applied to the Stylus Color 900
Type

Part name

Content

Part code

Availability

Table 6-5. Lubrication Points
No.

Lubricating Point

Amount

Grease

G-26

40g

B702600001

EPSON exclusive

1

The shaft in the [Frame Assembly, DE, Right]

G-26 (φ1 x 10 mm)

Oil

O-8

40g

1019753

EPSON exclusive

2

The teeth of the [Gear, 25.8]

G-26
(φ1mm x 1/3 of the circle)

3

The shaft in the [Frame Assembly, DE, Left]

G-26 (φ1 x 10 mm)

4

The teeth of the smaller gear in the
[Combination Gear,12, 26]

G-26
(φ1mm x 1/3 of the circle)

5

12 points on the [Paper Guide,Front]

G-26 (φ1 x 2 mm)

6

4 points in the [Grounding Plate,Paper Eject]

G-26 (φ1 x 2 mm)

NOTE: No adhesion is used in the Stylus Color 900.
Table 6-3. Lubrication Points Using G-26
No.

Lubricating Point

Amount

Ref. figure

1

Using a brush, lubricate the whole inner
surface of the round cutout in the right side of
the [Frame,ASF;B].

φ1 x 1 mm

Figure 6-8

7

2 contact areas; between [Roller
Assembly,Paper Eject, Rear] and [Grounding
Plate, Eject]

G-26 (φ1 x 2 mm)

2

Using a brush, lubricate right and left sides of
the [Hopper ASSY, C].

φ1 x 2 mm

Figure 6-9

8

2 contact areas; [Roller Assembly, Eject] and
[Grounding Plate, Eject]

G-26 (φ1 x 2 mm)

3

Lubricate the inner gear of the [Combination
gear,14.4, 24].

φ1 x 1 mm

Figure 6-10

9

The teeth of the right and left [Gear,27]s

4

Lubricate the surface of the bearing part (the
round cut) of the [Bushing,12] located at the
right end of the printer mechanism.

G-26
(φ1mm x 1/4 of the circle)

φ1 x 10 mm

Figure 6-11

10

2 points on the shaft in the [Lever Assembly,
Release,Cam]

G-26 (φ1 x 2 mm)

5

Lubricate the [Shaft, Pulley, Driven].

φ1 x 1 mm

Figure 6-12

6

Lubricate the back of the [Frame, Guide, CR].

φ1 x 150 mm Figure 6-13
11

[Oil Pad]
Refer to Section 6.2.1 “Lubricating the Carriage
Guide Shaft”.

O-8 (0.7 - 0.75 cc)

12

A hole in the [Frame Assembly, Middle, Left]

G-26 (φ1 x 3 mm)

Ref. figure

13

Roller shaft in the [Lever Assembly, Roller
Release, Right]

G-26 (φ1 x 1 mm)

Figure 6-14

14

Pin on the [Frame, Middle, Right]

G-26 (φ1 x 3 mm)

15

Narrow end of the [Shaft, Arm Lifter]

G-26 (φ1 x 2 mm)

Table 6-4. Lubrication Point Using the O-8
No.
1

Lubricating Point
Apply oil to the [Oil Pad].
Before lubricating, observe the CAUTION in
Section 6.2 well.

Maintenance

NOTE: Do not apply lubricant to the roller
surface.

Amount
0.7 - 0.75 cc

Lubrication and Adhesion

168

EPSON Stylus Color 900

Revision C

Table 6-6. Lubrication Points (continued)
No.

Amount

Lubricating Point

16

U-shape groves on the right and left edges of
the [Paper Guide Front Unit].

G-26 (φ1 x 5 mm, top and
bottom)

17

The surface of the [Shaft, CR]

O-8

NOTE: Do not apply lubricant to the [Shaft,
CR, Support].
18

Shaft hole of the [Combination Gear, 29.6,
29.6]

G-26 (φ1 x 5 mm)

19

The areas where the [Combination Gear,
29.6,29.6] and [Combination Gear,15.2,23.2]
come in contact with the [Mounting Plate
Assembly, Cap].

G-26 (φ1 x 5 mm)

[F ra m e , A S F ;B ]
G -2 6

NOTE: Do not apply lubricant to the shaft
of the [Combination Gear, 15.2,
23.2] which joins with the hole in
the [Pump Assembly].

Figure 6-8

G -2 6

[H o p p e r A s s e m b ly , C ]

G -2 6

Figure 6-9

Maintenance

Lubrication and Adhesion

169

EPSON Stylus Color 900

Figure 6-10

Revision C

[S h a ft, P u lle y , D r iv e n ]

Figure 6-11

G 2 6

Figure 6-12

G -2 6

G-26

Figure 6-14

C a r r ia g e

Figure 6-13
B a c k o f th e [C a r r ia g e ]

G 2 6

O il P a d
B a c k o f th e [F r a m e , G u id e , C R ]

Maintenance

O -8

Lubrication and Adhesion

170






APPENDIX

EPSON Stylus Color 900

Revision c

7.1 Connector Summary

Table shows the connector assignment of the C265 Main Board.

Figure 7-1 shows the cable connection of the Stylus Color 900.

Table 7-1. C265 Main Board Connections
Connector

C 2 6 5 P S B /P S E
(P o w e r S u p p ly
B o a rd )
A C

C N 1
C N 2

C N 3

C N 5

C N 6
P o w e r
L in e

L o g ic
L in e

C N 4

C N 3

C N 2

C N 1

C 2 6 5 M A IN
(M a in B o a r d )

Function

Refer to:

CN1

Parallel I/F connector

Chapter 1 / Interface
specifications

CN2

Type-B I/F connector

Type-B I/F Manual

CN3

Mac. Serial I/F connector

Chapter 1 / Interface
specifications

C N 8

B k , M , C n o z z le d r iv e

CN4

USB I/F connector

Chapter 1 / Interface
specifications

C N 9

Y e lo w n o z z le d r iv e

CN5

Power supply (Logic line)

Table 7-2

C N 1 0

P F M o to r d r iv e

CN6

Power supply (Power line)

Table 7-3

C N 1 1

C R

CN7

----

----

CN8

Bk, Magenta, Cyan nozzle drive

Table 7-4

C N 1 2

A S F M o to r d r iv e

CN9

Yellow nozzle drive

Table 7-5

C N 1 3

C o o lin g F a n d r iv e

CN10

PF motor drive

Table 7-6

C N 1 4

T h e r m is to r o n th e h e a t s in k

CN11

CR motor drive

Table 7-7

C N 1 6

A S F S o le n o id d r iv e

CN12

ASF motor drive

Table 7-8

C N 1 5

A S F S e n s o r
P E S e n s o r
H P S e n s o r

CN13

Cooling fan drive

Table 7-9

CN14

Thermistor on the heat sink

Table 7-10

CN15

Panel and Sensors (HP, PE, ASF)

Table 7-11

CN16

ASF solenoid drive

Table 7-12

U S B I/F
M a c . S e r ia l I/F
T y p e -B I/F
P a r a lle l I/F

M o to r d r iv e

C o n tro l P a n e l

Figure 7-1. Cable Connection of the Stylus Color 900

Appendix

Connector Summary

172

EPSON Stylus Color 900

Revision c

Table 7-2. Connector Pin Assignment - CN5
Pin

Signal
Name

I/O
----

Function

1, 7

GND

Ground

2, 3, 5, 6

5V

I

+5 voltage supply

4

PSC

I

Delay control at power off

Table 7-3. Connector Pin Assignment - CN6
Pin

Signal
Name

I/O

1, 6

GND

---

2, 3, 4, 5

+42 V

I

Appendix

Function
Ground
+42 voltage supply

Table 7-4. Connector Pin Assignment - CN8
Pin

Signal Name

I/O

Function

1

ANODE1

I

Row A temperature detection analog signal

2

ANODE2

I

Row A temperature detection analog signal

3

GND2A

---

Ground for the Nozzle Row A

4

GND2A

---

Ground for the Nozzle Row A

5

COMa

O

Power voltage for the Nozzle Row A (black)

6

COMb

O

Power voltage for the Nozzle Row A (black)

7

GND2B

---

Ground for the Nozzle Row B nozzles

8

GND2B

---

Ground for the Nozzle Row B nozzles

9

ANODE3

I

Row C (Cyan) temperature detection analog
signal

10

ANODE4

I

Row D (Magenta) temperature detection analog
signal

11

GND2C

---

Ground for the Nozzle Row C

12

GND2C

---

Ground for the Nozzle Row C

13

COMc

O

Power voltage for the Nozzle Row C

14

COMd

O

Power voltage for the Nozzle Row D

15

GND2D

---

Ground for the Nozzle Row D

16

GND2D

---

Ground for the Nozzle Row D

17

VHV

O

Power supply for the comparator (Nozzle
Selector)

18

GND

---

Ground

19

TH

I

Analog data from the thermistor on the printhead

20

LS2

I

Phase B signal from the linear encoder

21

LS1

I

Phase A signal from the linear encoder

Connector Summary

173

EPSON Stylus Color 900

Revision c

Table 7-5. Connector Pin Assignment - CN9
Pin

Table 7-6. Connector Pin Assignment - CN10

Signal Name

I/O

Function

Pin

1

COMe

O

Power voltage for the Nozzle Row E (Yellow)

2

GND2E

---

Ground for the Nozzle Row E

3

GND2E

---

Ground for the Nozzle Row E

4

ANODE5

I

Row E temperature detection analog signal

5

B2

O

Outputs dot selection signal to the Row B
(black)

6

GND

---

Ground

7

B1

O

Outputs dot selection signal to the Row A
(black)

8

GND

---

Ground

9

C

O

Outputs dot selection signal to the Cyan row

10

GND

---

Ground

11

M

O

Outputs dot selection signal to the Magenta
row

12

GND

---

Ground

13

Y

O

Outputs dot selection signal to the Yellow row

14

GND

---

Ground

15

CLK

O

Synchronization clock signal for dot selection
signal transmission

16

GND

---

Ground

17

LAT

O

Latch signal to inform of a dot selection signal
transfer completion

18

GND

---

Ground

19

INV

O

Inversion signal of the print data
(High without data)

20

COB

I

Black ink cartridge In/Out detection signal

21

COC

I

Color ink cartridge In/Out detection signal

Appendix

Signal Name

I/O

Function

1

PF A

I/O

2

PF B

3

PF -A

I/O

Phase -A Input/Output data
When inputting, connects a current from the
Phase A to the ground via the coil.

4

PF -B

I/O

Phase -B Input/Output data
When inputting, connects a current from the
Phase B to the ground via the coil.

Phase A Input/Output data
When inputting, connects a current from the
Phase -A to the ground via the coil.

I/OB Phase B Input/Output data
When inputting, connects a current from the
Phase -B to the ground via the coil.

Table 7-7. Connector Pin Assignment - CN11
Pin

Signal Name

I/O

1

CR A

I/O

Phase A Input/Output data
When inputting, connects a current from the
Phase -A to the ground via the coil.

2

CR B

I/O

Phase B Input/Output data
When inputting, connects a current from the
Phase -B to the ground via the coil.

3

CR -A

I/O

Phase -A Input/Output data
When inputting, connects a current from the
Phase A to the ground via the coil.

4

CR -B

I/O

Phase -B Input/Output data
When inputting, connects a current from the
Phase B to the ground via the coil.

Connector Summary

Function

174

EPSON Stylus Color 900

Revision c
Table 7-11. Connector Pin Assignment - CN15

Table 7-8. Connector Pin Assignment - CN12
Pin
1

2

Signal Name

I/O

ASF A

I/O

ASF B

3

ASF -A

4

ASF -B

I/O

I/O

I/O

Function

Pin

Phase A Input/Output data
When inputting, connects a current from the
Phase -A to the ground via the coil.
Phase B Input/Output data
When inputting, connects a current from the
Phase -B to the ground via the coil.
Phase -A Input/Output data
When inputting, connects a current from the
Phase A to the ground via the coil.
Phase -B Input/Output data
When inputting, connects a current from the
Phase B to the ground via the coil.

Signal Name

I/O

1

GND

---

Ground

2

GND

---

Ground

3

SW0

I

Detects the power SW condition.

4

PSC

O

Charging voltage to the electrolysis condenser
for the delay control

5

SW1

I

Detects the Load/Eject SW condition

6

SW2

I

Detects Cleaning SW condition

7

LED0

O

Power LED drive signal

8

LED1

O

Color ink Near Empty or perfect out LED drive
signal

9

LED2

O

Paper Out Error LED drive signal

10

LED3

O

Black Ink Near Empty or perfect out LED drive
signal

11

+5V

O

Power supply for the LED/PE sensor

12

+5V

O

Power supply for the LED/PE sensor

13

GND

---

Ground

14

ASF

I

ASF sensor condition detection signal

15

PE

I

PE sensor condition detection signal

16

HP

I

HP sensor condition detection signal

17

PEVCC

O

Power supply for the PE sensor drive

18

HPVCC

O

Power supply for the HP sensor drive

Table 7-9. Connector Pin Assignment - CN13
Pin

Signal Name

I/O

Function

1

+35V

O

Power supply for driving the fan

2

GND

---

Ground

Table 7-10. Connector Pin Assignment - CN14
Pin

Signal Name

I/O

Function
Analog signal for the temperature detection of
the heat sink surface on the main board.

1

THM1

I

2

THM2

---

Table 7-12. Connector Pin Assignment - CN16

Ground
Pin

Appendix

Function

Signal Name

I/O

1

VBB

O

Power supply voltage for the solenoid
excitation (42V)

2

GND

---

Ground

Connector Summary

Function

175

EPSON Stylus Color 900

Revision c

7.2 EEPROM ADDRESS MAP
Table 7-14. EEPROM Address Map (2/8)

This section contains the EEPROM map for the Stylus Color 900.
Address

Table 7-13. EEPROM Address Map (1/8)
Address
00H

Explanation

Settings

Password 0

01H

Settings

QPIT
settings

Factory
settings

QPIT
settings

Factory
settings

15H

Bi-D Adjustment data
(for Normal x3)

-36 <= n <= +36
(by 1/1440 inch)

00H

(*1)

0FH

−

16H

-36 <= n <= +36
(by 1/1440 inch)

00H

(*1)

5AH

−

Bi-D Adjustment data
(for Variable-2)

17H

Bi-D Adjustment data
(for Variable-1)

-36 <= n <= +36
(by 1/1440 inch)

00H

(*1)

18H

Uni-D Adjustment data

-36 <= n <= +36
(by 1/1440 inch)

00H

(*1)

19H

reserved

00H

−

1AH

reserved

00H

−

1BH

1st dot position adjustment
data

00H

(*1)

1CH

reserved

00H

−

02H

EEPROM mapping revision

41H

−

03H

reserved

00H

−

04H

CG

0: STD
1: NLSP

00H

(*1)

Market ID

0: Standard
(World)
1: Custom

00H

05H

Explanation

06H, 07H,
08H, 09H

Custom EEPROM sub number

0AH

Head actuator rank ID for VhN

00H

(*1)

1DH

reserved

00H

−

0BH

reserved

00H

−

1EH

reserved

00H

−

0CH

reserved

00H

−

1FH

ERROR Code

00H

00H

0DH

Head actuator rank ID for VhL

00H

(*1)

CPSI password

00H

00H

0EH

Head actuator rank ID for VhU

00H

(*1)

0FH

Head actuator rank ID for VhM

00H

(*1)

10H

reserved for Head-ID

00H

(*1)

11H

reserved for MicroWeave-ID

00H

(*1)

12H

Head actuator rank ID for lwC

00H

(*1)

13H

Head actuator rank ID for IwM

00H

(*1)

14H

reserved

00H

−

*1: See NOTE at the end of the section.

Appendix

00H

(*1)

00H

20H, 21H,
22H, 23H
24H

CPSI license flag

0: disable
1: enable

00H

00H

25H

CPSI font license

0: disable
1: enable

00H

00H

26H

Interface selection

0:
1:
2:
3:
4:

00H

00H (*2)

Auto
Parallel
Serial
USB
Option

*1, *2: See NOTE at the end of the section.

EEPROM ADDRESS MAP

176

EPSON Stylus Color 900

Revision c

Table 7-15. EEPROM Address Map (3/8)
Address

Explanation

Settings

Table 7-16. EEPROM Address Map (4/8)

QPIT
settings

Factory
settings

Address
30H

Font

0:
2:
4:
11:

31H

Pitch

0: 10cpi
2: 15cpi
4: 20cpi

32H

Print
direction
control

0: Bi-D
1: Uni-D
2: Auto

33H

CG table

0: Italic U.S.A
2: Italic Germany
4: Italic Denmark
6: Italic Italy
8: PC 437
10: PC 850
12: PC 863
14: PC 861
16: Abicomp
18: lSO Latin1
20: PC 855
22: PC 857
24: PC 869
26: Code MJK
28: lSO Latin 1T
30: PC 774
32: ISO 8859-2
34: PC 866UKR
36: PC APTEC
38: PC 720
40: Hebrew8
42: PC 858

27H

Interface time-out

0 to 255
(by second, value of 0
means 10 seconds)

0AH

0AH

28H

Compatibility speed

0:
1:
2:
3:

00H

00H

Fast
Slow
Special-1
Special-2

29H

ECP speed (*A)

0: Fast
1: Slow

00H

00H

2AH

IEEE1284.4 for
Parallel

0: Auto
1: On
2: Off

00H

00H

2BH

I/F Control flags

bit1: ECP mode
(0=Off, 1=On) (*B)
bit0: lEEE1284 mode
(0=On, 1=Off) (*C)

00H

00H

2CH

IEEE1284.4 for USB

0: Auto
1: On
2: Off

00H

01H

00H

−

2DH, 2EH,
2FH

reserved for USB

*A: BUSY signal delay time from fall-edge of a -STB signal. (Fast: Max. 1MB/s,
Slow: Max. 600KB/s)
*B: Selects IEEE1284 transfer mode. (ECP pr Nibble)
*C: Enables or disables reverse transfer. (When disabled, ignore -SLN signal.)
*2: See NOTE at the end of the section.

Appendix

EEPROM ADDRESS MAP

Explanati
on

Settings
Roman
Courier
Script
Sans Serif H

1:
3:
10:
7:

Sans Serif
Prestige
Roman T
Draft

1: 12cpi
3: 17cpi
5: Proportional

1: Italic France
3: Italic U.K
5: Italic Sweden
7: Italic Spain
9: PC 437 Greek
11: PC 860
13: PC 865
15: BRASClI
17: Roman 8
19: PC 853
21: PC 852
23: PC 866
25: MAZOWIA
27: ISO 8859-7
29: Bulgaria
31: Estonia
33: PC 866 LAT
35: PC AR864
37: PC 708
39: Hebrew7
41: PC 862
43: ISO 8859-15

QPIT
settings

Factory
settings

00H

02H

00H

00H

02H

02H

08H

08H

177

EPSON Stylus Color 900

Revision c

Table 7-17. EEPROM Address Map (5/8)
QPIT
settings

Factory
settings

Address

bit7: Software
(0=ESC/P, 1=IBM)
bit6: A.G.M. (0=Off, 1=On)
bit5: Auto CR (0=Off, 1=On)
bit4: Zero slash
(0=Off, 1=On)
bit3: Reserved
bit2: Reserved
bit1: Network I/F mode
(0=Off, 1=On)
bit0: Auto line feed
(0=Off, 1=On)

00H

00H

40H

bit7: Entry Self-Test
bit6: Entry Hex-Dump
bit5: Extended settings
bit4: Reserved
bit3: Reserved
bit2: Cleaning
bit1: Replace l/C
bit0: Load/Elect

00H

42 to 44 x 360
(by1/360 inch)

00H

00H

78H

78H

1244 to 44 x 360
(by 1/360 inch)

1EH

1EH

F0H

F0H

1244 to 44 x 360
(by 1/360 inch)

1EH

1EH

F0H

F0H

Address

Explanation

Settings

34H

Software
A.G.M.
Auto CR
Zero Slash
Network I/F mode
Auto LF

35H

36H

Panel mask
function

Top margin

37H
38H

Bottom margin

39H
3AH

Page length

3BH

Table 7-18. EEPROM Address Map (6/8)
Settings

Password 1

41H

reserved for main

00H

−

3DH

reserved for main

00H

−

3EH

reserved for main

00H

−

3FH

reserved for main

00H

−

QPIT
settings

Factory
settings

0FH

−

5AH

−

42H

Ink flag 1

bit7: Reserved
bit6: black one-time
bit5: color one-time
bit4: Initial fill required
bit3: Reserved
bit2: ink cleaning seq.
bit1: black CL required
bit0: color CL required

00H

10H

43H

Ink flag2

bit2: YMC cartridge changed
and cleaned
bit1: Black cartridge
changed and cleaned
bit0: Black cartridge
changed and cleaned

00H

00H

00H

3CH

Appendix

Explanation

44H, 45H,
46H, 47H

Ink counter Cb

00H

00H

48H, 49H,
4AH, 4BH

Ink counter Cy

00H

00H

4CH, 4DH,
4EH, 4FH

Ink counter Cm

00H

00H

50H, 51H,
52H, 53H

Ink counter Cc

00H

00H

54H, 55H,
56H, 57H

Ink counter Clm

00H

00H

58H, 59H,
5AH, 5BH

Ink counter Clc

00H

00H

5CH, 5DH

Ink counter Rb0

00H

00H

EEPROM ADDRESS MAP

178

EPSON Stylus Color 900

Revision c

Table 7-19. EEPROM Address Map (7/8)
Address

Explanation

Settings

Table 7-20. EEPROM Address Map (8/8)

QPIT
settings

Factory
settings

Address
86H

5EH, 5FH

Ink counter Ry0

00H

00H

60H, 61H

Ink counter A0

00H

00H (*3)

62H, 63H

Power off time

00H

00H (*2)

64H, 65H

CL time

00H

00H (*2)

66H, 67H

accumulated printing
time

00H

00H

68H, 69H

reserved for inksystem

00H

−

6AH, 6BH,
6CH, 6DH,
6EH, 6FH,
70H, 71H,
72H, 73H,
74H, 75H,
76H, 77H,
78H, 79H,
7AH, 7BH,
7CH, 7DH,
7EH, 7FH

Printer-ID Strings[22]

00H

00H

80H

Password 2

81H

0FH

−

5AH

−

82H

Ink end by Head
temperature

00H

00H

83H

P2

00H

00H

84H

P1

00H

00H

85H

Temperature at Bi-D
adjustment (refer to
EEPROM 15H)

00H

00H

QPIT
settings

Factory
settings

Temperature at Bi-D
adjustment (refer to
EEPROM 16H)

00H

−

87H

Temperature at Bi-D
adjustment (refer to
EEPROM 17H)

00H

−

88H

reserved

00H

−

89H

reserved

00H

−

8AH

Head TG-ID

00H

(*1)

8BH

reserved

00H

−

8CH, 8DH,
8EH, 8FH

Total count of Paper
through

00H

00H

90H, 91H

Ink counter Rb80

00H

00H

92H, 93H

Ink counter Ry80

00H

00H

94H, 95H

Ink counter A80

00H

00H

96H, 97H,
98H, 99H

Total count of CR
seek

00H

00H

9AH, 9BH,
9CH, 9DH,
9EH, 9FH

reserved

00H

−

Explanation

Settings

0: Sharp 1: SEC

NOTE:
*1: Adjusted at factory.
*2: Initialized after panel initialization is performed.
*3: Initialized after initialization of the ink overflow counter in EEPROM is performed.

*2, *3: See NOTE at the end of the section.

Appendix

EEPROM ADDRESS MAP

179

EPSON Stylus Color 900

Revision c

7.3 Component Layout

Figure 7-2. C265 Main Board (Component side)

Appendix

Component Layout

180

EPSON Stylus Color 900

Revision c

Figure 7-3. C265 Main Board (Soldering side)

Appendix

Component Layout

181

EPSON Stylus Color 900

Revision c

Figure 7-4. C265 PSB Board

Appendix

Figure 7-5. C265 PSE Board

Component Layout

182

EPSON Stylus Color 900

Revision c

Figure 7-6. C265 PNL Board

Appendix

Component Layout

183

EPSON Stylus Color 900

Revision c

7.4 Parts List

Table 7-22. Parts List (2/6)
No.

Table 7-21. Parts List (1/6)
No.

Description

No.

Description

100

HOUSING, UPPER

119

LOCK, STACKER

101

HOUSING, LOWER

120

COMPRESSION SPRING, 2.94

102

COVER, PRINTER

121

SHIELD PLATE, MAIN, UPPER,
RIGHT

103

PAPER SUPPORT ASSY

122

SHIELD PLATE, MAIN, UPPER,
LEFT

104

HOUSING, REAR

123

GROUNDING PLATE, I/F, UPPER

105

COVER, CONNECTOR, UPPER 124

GROUNDING PLATE, I/F

106

STACKER ASSY.

125

GUIDE, I/F BOARD

107

HOUSING, PANEL, RIGHT

126

SHIELD PLATE, MAIN, UPPER, I/
F

Description

No.

Description

140

GUIDE, SHIELD PLATE

410

POWER CABLE ASSY.

142

CLAMP

450

BOARD ASSY., PANEL

145

C.P.SCREW

500

PRINTER
MECHANISM(ASP)M4P10-100

146

C.B.S. SCREW

501

FRAME, UPPER

147

C.B.S. SCREW

502

FRAME, LOWER

148

C.B.S-TITE SCREW

503

FRAME ASSY., LEFT

149

C.B.S-TITE SCREW

504

FRAME, RIGHT

150

C.B.P-TITE SCREW, 3X8, F/ZN

505

FRAME, GUIDE, CR

151

C.B.P-TITE, 3X10, F/ZN

506

LEVER, PG

152

C.B.SCREW, 4X14, F/ZN

507

TORSION SPRING, 64.7

154

C.B.P-TITE SCREW, 3X6, F/ZN

508

TIMING BELT

108

KEY TOP

129

SHIELD PLATE, P/S, LOWER

155

C.P.P-TITE SCREW, 4X12, F/ZN

509

HOLDER, PULLEY, DRIVEN

109

OPTICAL PLATE

130

SHIELD PLATE, P/S, UPPER

156

C.B.(O) SCREW 4X8 F/ZG

510

PULLEY, DRIVEN

110

SLEEVE, OPTICAL PLATE

131

GROUNDING PLATE, P/S

180

LABEL, CAUTION 1

511

SHAFT, PULLEY, DRIVEN

111

SHEET, PROTECT, PANEL

132

SHIELD PLATE, P/S, UPPER,
RIGHT

181

LABEL, ACCESSORY

512

BUSHING, PULLEY, DRIVEN

200

BOARD ASSY., MAIN

513

COMPRESSION SPRING, 48

112

HOUSING, PANEL, LEFT

133

SPACER, SHIELD PLATE
300

INK SYSTEM ASSY.

POROUS PAD, INK EJECT, L

134

FOOT, P/S

BOARD ASSY., POWER
SUPPLY

514

113
114

POROUS PAD, INK EJECT, R

135

MOUNTING PLATE, FAN

330

WIRE HARNESS

515

MOTOR ASSY., PF

115

LOGO PLATE

136

GUIDE, FRAME, FAN

331

WIRE HARNESS

516

116

COVER, POROUS PAD, INK
EJECT

137

SHIELD PLATE, I/F

GROUNDING PLATE, FRAME,
LOWER

332

WIRE HARNESS

517

LINEAR SCALE

117

SPACER, POROUS PAD, INK
EJECT

138

SHIELD PLATE, MAIN, LOWER

333

WIRE HARNESS

518

PAPER GUIDE, RIGHT

334

WIRE HARNESS

519

PAPER GUIDE, UPPER

118

FOOT

139

GROUNDING PLATE, M/B
335

FAN ASSY.

520

PAPER GUIDE, LEFT

Appendix

Parts List

184

EPSON Stylus Color 900

Revision c

Table 7-23. Parts List (3/6)
No.

Table 7-24. Parts List (4/6)

Description

No.

Description

521

SHAFT, PAPER GUIDE, UPPER

543

CLEANER, HEAD, ASP

566

LEVER, DETECTOR, IC, BK

589

ROD SPRING, STAR WHEEL

522

TORSION SPRING, 117.6

545

SHAFT, CR, GUIDE

567

LEVER, DETECTOR, IC, C

590

STAR WHEEL ASSY, 8;D

523

SHAFT, ROLLER, DRIVEN

546

LEVER, PG, SUB

568

TORSION SPRING, 2.04

591

HOLDER, FFC, CENTER

524

ROLLER, DRIVEN;E

547

OIL PAD

569

COVER, DETECTOR, IC

592

HOLDER, FFC, LEFT

525

HOLDER, LINEAR SCALE

548

COVER, CARTRIDGE, BK

570

MOTOR ASSY., CR

593

CABLE, HEAD, SHORT

526

EXTENTION SPRING, 2.13

549

COVER, CARTRIDGE, C

571

INSULATOR, MOTOR, CR

594

CABLE, HEAD, LONG

527

BUSHING, PARALLEL, ADJUST,
RIGHT

550

LABEL, LEVER CARTRIDGE,
BLACK

572

SPACER, INSULATOR

595

SPUR GEAR, 16.5

573

FRAME, MOTOR, CR

596

BUSHING, 6

528

BUSHING, PARALLEL, ADJUST,
LEFT

551

LABEL, LEVER CARTRIDGE,
COLOR

574

HEXAGON NUT

597

BUSHING, 12

529

HOLDER, FFC, RIGHT

552

LIFTER, CARTRIDGE, BK

575

HOLDER, FFC, CR

599

BUSHING, 12, LEFT

530

BOARD ASSY., SUB

553

LIFTER, CARTRIDGE, C

577

SPUR GEAR, 18

600

COMPRESSION SPRING, 5.85

531

PAPER SUPPORT, SUUPPORT,
UPPER

554

DETECTOR, I/C

578

PAPER GUIDE, REAR

601

SPACER, FASTEN, ROLLER, PF

579

ROLLER, PF

602

FRAME ASSY., PAPER
SUPPORT

555

SPACER, FASTEN, ROLLER,
PF;B

580

PAPER GUIDE, FRONT

603

COMBINATION GEAR, 22, 81

533

EXTENSION SPRING, 0.29

556

HARNESS, ENCODER

581

ROLLER, PAPER EJECT

604

C-RING

534

HOLDER, DETECTOR, PE

557

CARRIAGE ASSY.

582

FRAME, PAPER EJECT

605

535

LEVER, DETECTOR, PE

558

GROUNDING PLATE, HEAD

SCALLOP SPRING PIN-AW,
2X16, F/B

536

TORSION SPRING, 0.22

559

LEVER, HEAD, ADJUST

583

ANTI STATIC CLOTH

606

FRAME SUB ASSY., DE

537

CIRCUIT ASSY, PE

560

LEVER, HEAD, FASTEN

584

HOLDER, STARWHEEL, FRONT 607

MOTOR ASSY., ASF

538

HARNESS, PE

561

BOARD ASSY., ENCODER

585

HOLDER, STAR WHEEL, RIGHT

608

SOLENOID

539

DETECTOR, HP

562

HOLDER, BOARD, ENCORDER

586

HOLDER, STAR WHEEL, LEFT

609

LEVER, TRIGGER

540

HARNESS, HP

563

PLATE, SLIDE, CLEANER

587

HOLDER ASSY., STAR WHEEL,
RIGHT, ASP

610

EXTENTION SPRING, 0.21

541

NYLON CLIP

564

SLIDER, CR

588

SHAFT, DE, PLANET

SHEET, COVER, M/B

565

TORSION SPRING, 98

HOLDER ASSY., STAR WHEEL,
LEFT, ASP

611

542

532

Appendix

No.

Description

No.

HARNESS, DETECTOR, IC

Parts List

Description

185

EPSON Stylus Color 900

Revision c

Table 7-25. Parts List (5/6)
No.

Description

No.

Table 7-26. Parts List (6/6)
Description

No.

612

LEVER, CHANGE

637

HOLDER, SHEET, PAPERFEED

613

COMBINATION GEAR, 14.4, 24

638

ROLLER ASSY, LD, LEFT

614

SPUR GEAR, 20.8

639

ROLLER ASSY, LD, RIGHT

615

COMBINATION GEAR, 12.8,
27.2

640

COVER, ROLLER, LD, LEFT

616

COMBINATION GEAR, 20, 38.4

641

COVER, ROLLER, LD, RIGHT

617

SPUR GEAR, 26.25

642

COMPRESSION SPRING, 1.961

620

FRAME, ASF

643

PAPER LOADING ASSY., RIGHT

621

WHEEL, DETECT

644

PAPER LOADING ASSY., LEFT

622

LEVER, FASTEN,
EDGEGUIDE;B

658

SPUR GEAR, 27.2

623

EXTENSION SPRING, 0.088

659

HARNESS, ASF

624

SHAFT, ROLLER, LD

663

C.B.P-TITE(P4), 3X8, F/ZN

625

LEVER, HOPPER, RELEASE

664

626

HOPPER

665

C.B.P-TITE SCREW, 3X6, F/ZN

627

REINFORCEMENT PLATE,
HOPPER

666

C.P.P-TITE SCREW, 4X12, F/ZN

628

EDGEGUIDE

667

C.B.P-TITE, 2.5X5, F/ZN

629

SLIDER, EDGEGUIDE

668

C.B.S. SCREW

630

COMPRESSION SPRING, 3.23

669

RETAINING RING

631

PAD, BREAK, EDGE GUIDE

670

RETAINING RING

632

CORK

671

RETAINING RING

633

CORK;B

672

PLAIN WASHER 6.1X0.5X12, F/NI

634

SHAFT, MOUNT, CR

673

PLANE WASHER, 12.2X0.5X15

635

C.P.S-TITE(P4), 3X6, F/ZN

674

PLANE WASHER

636

SHEET, PAPERFEED

675

LEAF SPRING

Appendix

Description

No.

Description

676

LEAF SPRING

1

INDIVIDUAL CARTON BOX FOR
AMERICA

677

LEAF SPRING

3

PAD PRINTER

678

U-TYPE S.W.

4

PAD, ACCESSORY

679

CLAMP, FERRITE CORE

5

PAD, STACKER

700

PRINT HEAD, IJ480-0A0

6

RLASTIC PROTECTIVE BAG,
510X870X0.05T

800

ASF UNIT, ASP

Parts List

186

EPSON Stylus Color 900

Revision c

7.5 Exploded Diagrams
See the following pages for the Exploded diagrams.

Appendix

Exploded Diagrams

187

152

147
152

149
145
103
102
105
145
EAI Only
103

104

500

147
150

151

115

117

116
150

155

A

181

120

for EAI,LATIN

182

for LATIN

119

100
150
150
180

112
110

147

113

151 109
150
114

111

151

450
142
108

142

155

142

154
A

107

140
154
411 for ETT

106

101

410 for USA

400
156
412
118

for EUR.,ASIA,
OSEANIA

118

EPSON STYLUS COLOR 900

No.1

Rev.01

10056

145
145

333

C
145

B

E

332

131

D

133

K

B
334
I

H

G

F

146

126

C

130

530

145

145

J
146

122

123
146
330
145
125

147

331

124
200

541

I

K

H
V

146
L

G

146

F

146
121

136

132

146

145

300
145 J
137
138
134

145

146
145

154

148
145

154

148

146
V
139
335
135
145

L
146
129

EPSON STYLUS COLOR 900 No.2
Rev.01

10056

668

668
O
516

668

503

516
502

M
506

507

668

668

E
O

504

515

505

543

668
668

501

668

514

510
511

668

512
668
508

P

668
N

N

509
513

EPSON STYLUS COLOR 900

No.3

Rev.01

10056

533

550
670

635

532

527

551

538

537
534
531
535

D

548

536

526
525

570

572

552

573

(501)

549

571

574

P

553

571
572
700

520
668

574
668

517

542

668

519

R

540

Q

539
668

663

558

521
522
524
519

635
519

528

523

676
674

521

554

560

575

T

671
564

522
521
522
524

524
519

518
523

529

523

522

521
522
546

524

524
519

523

562
569

565

523

Q

521
545

524

556

555
T

561

S

566
557

523
547

S

559

568
522

R

667

521

563

567
568

667

EPSON STYLUS COLOR 900

No.4

Rev.01

10056

603
605
601
599

602

673

673

665
600
673

(503)

604
669

579
595

577
670

580

672

597

596
678
672
670
592
581

668

615

614
582

668

593

675

594

677

669

590

588

688
589

586

611
584
590

589

590
589 590
589 590
589 590
589 590
589 590
589 590

608

589

590

613
(504)

589
596

584

679

606

U

612

664
668
609

584
585

583

U

589 590
589 590
589 590
589 590
589 590
589 590

668
610

616
668
591
669
587
617
607

668

EPSON STYLUS COLOR 900

No.5

Rev.01

10056

627

629

628
800
630

626

634

631
632

659

634

539
620
621
633
635
623
622
625

644

671
666
624
622
M
623

642

625
658
636

637

669

671
636
643

638

637
640
641
639

EPSON STYLUS COLOR 900 No.6
Rev.01

10056

04
03

03
05

06
03
02 for S.E.ASIA

01

03

EPSON STYLUS COLOR 900 No.7
10056

Rev.01

EPSON Stylus Color 900

Revision c

7.6 Circuit Diagrams
See the following pages for the circuit diagrams below.












Appendix

C265 Main Board (1/2)
C265 Main Board (2/2)
C265 PSB Board
C265 PSE Board
C265 PNL Board

Circuit Diagrams

195



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