Xerox Book.P780 Train Tektronix Phaser 780 Color Laser Printer Service Manual Ation

User Manual: Xerox Tektronix - Xerox Phaser 780 Color Laser Printer Service Manual ation La Biblioteca de los 8 bits

Open the PDF directly: View PDF PDF.
Page Count: 234 [warning: Documents this large are best viewed by clicking the View PDF Link!]

Warning
The following servicing instructions are for
use by qualified service personnel only. To
avoid personal injury, do not perform any
servicing other than that contained in
operating instructions unless you are qualified
to do so.
This printing: September 1999
063-3041-01
PHASER® 780
COLOR LASER PRINTER
Service Quick Reference Guide
Copyright
©
1998 by Tektronix, Inc., Wilsonville, Oregon. Printed in the United
States of America. All rights reserved. Contents of this publication may not be
reproduced in any form without permission of Tektronix, Inc.
Tektronix
®
, Phaser
®
, and Made for Each Other
®
are registered trademarks of
Tektronix, Inc. TekColor™, PhaserShare™, PhaserMatch™, PhaserLink™,
Finepoint™ and PhaserPrint™ are trademarks of Tektronix, Inc.
RealSUPPORT
SM
and TekColor Care
SM
are service marks of Tektronix, Inc.
Other marks are trademarks or registered trademarks of the companies with
which they are associated.
October 1998: First Printing
December 1998: Changed pages; 2, 3, 15, 72, 78, 92, 93, 105, 108, 109, 111, 113, 114,
115, 117, 121, 124, 127, 129, 134, 137, 138, 139, 140, 141, 144, 145
TE/mq/mm
Users safety summary
Terms in
CAUTION Conditions that can result in damage to the product.
manual:
WARNING Conditions that can result in personal injury
or loss of life.
Power source:
For 110 VAC printers, Do not apply more than 130 volts RMS
between the supply conductors or between either supply conductor and ground.
Use only the specified power cord and connector. For 220 VAC printers, Do not
apply more than 250 volts RMS between the supply conductors or between either
supply conductor and ground. Use only the specified power cord and
connector.Refer to a qualified service technician for changes to the cord or
connector.
Operation of product:
Avoid electric shock by contacting a qualified service
technician to replace fuses inside the product. Do not operate without the covers
and panels properly installed. Do not operate in an atmosphere of explosive
gases.
WARNING Turning the power off using the On/Off switch does
not de-energize the printer. You must remove the power cord to
disconnect the printer from the mains. Keep the power cord
accessible for removal in case of an emergency.
Safety instructions:
Read all installation instructions carefully before you plug the
product into a power source.
Terms on
CAUTION A personal injury hazard exists that may not be
product:
apparent. For example, a panel may cover the hazardous area.
Also applies to a hazard to property including the product itself.
DANGER A personal injury hazard exists in the area where
you see the sign.
Care of product:
Disconnect the power plug by pulling the plug, not the cord.
Disconnect the power plug if the power cord or plug is frayed or otherwise
damaged, if you spill anything into the case, if product is exposed to any excess
moisture, if product is dropped or damaged, if you suspect that the product needs
servicing or repair, and whenever you clean the product.
Ground the product:
Plug the three-wire power cord (with grounding prong) into
grounded AC outlets only. If necessary, contact a licensed electrician to install a
properly grounded outlet.
Symbols as marked on product:
DANGER high voltage:
Protective ground (earth) terminal:
Use caution. Refer to the manual(s) for information:
Laser use caution. Refer to the manual(s) for information:
WARNING:
If the product loses the ground connection, usage of knobs and
controls (and other conductive parts) can cause an electrical shock. Electrical
product may be hazardous if misused.
!
Service safety summary
For qualified service personnel only:
Refer also to the preceding Users Safety
Summary.
Do not service alone:
Do not perform internal service or adjustment of this product
unless another person capable of rendering first aid or resuscitation is present.
Use care when servicing with power on:
Dangerous voltages may exist at several
points in this product. To avoid personal injury, do not touch exposed
connections and components while power is on.
Disconnect power before removing the power supply shield, soldering, or
replacing components.
Do not wear jewelry:
Remove jewelry prior to servicing. Rings, necklaces, and
other metallic objects could come into contact with dangerous voltages and
currents.
Power source:
This product is intended to operate from a power source that will
not apply more than 250 volts rms between the supply conductors or between
either supply conductor and ground. A protective ground connection by way of
the grounding conductor in the power cord is essential for safe operation.
This product is certified under IEC 825 as a Class 1 Laser Product.
9008-78
DANGER:
Invisible laser radiation
when open and interlock
defeated.
AVOID DIRECT
EXPOSURE TO BEAM.
CAUTION:
Invisible laser radiation
when open and
interlocks defeated.
AVOID DIRECT
EXPOSURE TO BEAM.
VORSICHT:
Unsichtbare Laserstrahlung,
wenn Abdeckung geöffnet
und Sicherheitsverriegelung
überbrückt.
NICH DEM STRAHL
AUSSETZEN.
ATTENTION:
Rayonnement laser invisible
dangereux en cas
d'ouverture et lorsque
la sécurité est neutralisée.
EXPOSITION DANGEREUSE
AU FAISCEAU. Class 3B
PELIGRO:
Cuando se abre y se
invalida el bloqueo, se
producen radiaciones
invisibles de láser.
EVITESE LA
EXPOSICION
DIRECTA A TALES
RAYOS.
´
VARNING:
Osynlig laser-
strálning när denna
del är öppnad och
spärrar är
urkopplade.
STRÅLEN
ÄR FARLIG.
VARNING:
Osynlig laserstrálning
när denna del är
öppnad och spärrar är
urkopplade.
BETRAKTA EJ
STRÅLEN.
VAROI:
Näkymätön
avattaessa ja
suojalukitus
ohitettaessa olet
alttiina lasersäteilylle.
ÄLÄ KATSO
SÄTEESEN.
ADVARSEL:
Usynlig laserstràling
ved abning når
sikkerhedsafbrydere
er ude af funktion.
UNDGÅ UD
ÆTTELSE FOR
STRÅLING.
ADVARSEL:
Usynlig laserstraling
nar deksel åpnes og
sikkerhedslas brytes.
UNNGÅ
EKSPONERING
FOR STRÅLEN.
PJQT4521ZA
Service Guide
vii
Contents
General Information 1
Phaser 780 overview 2
Memory considerations 3
Print engine assemblies 5
The image processor 10
Front panel 11
Rear panel 12
Network card LEDs 12
Specifications 14
Regulatory specifications 17
Safety 17
EMC 17
Energy Star certification 17
Error Codes and Messages 19
Troubleshooting 39
System power-up sequence 39
Print engine troubleshooting 40
Printer will not power up 40
Erratic printer operation 41
Making a print engine only test print 42
Printing and print quality problems 43
Initial checks and actions 43
Light (undertone) prints 44
Blank prints 45
Monochrome prints 46
Black prints 47
One color is faded 47
Missing band in direction of paper travel 48
Missing bands in parallel to the leading edge 49
Streaks in direction of paper travel 51
Streaks parallel with the leading edge 52
Banding 53
Edge of print is wrinkled with an area of ragged discoloration. 53
Random missing spots 54
Random spotting 55
Repetitive mark appears on each print 56
Residual image or ghosting 56
Background contamination 57
Unfused image or image easily rubs off of page 58
Toner on back of print 58
viii
Phaser 780 Color Printer
Print is mottled 59
Image mis-registered on paper 60
Color layer not correctly registered 60
Color representation not correct 61
Oil stain or gloss variation on print 61
Random spotting 62
Media jams and the paper path 63
Skewed image 63
Damaged prints 64
Inoperative lower tray feeder 65
Power problems 65
All front panel indicators remain off. The printer does not initialize
upon power-up 65
Front panel indications 66
Media tray indicates missing or empty when it is not 66
Macintosh printing problems 66
Image never prints 66
Image prints in black-and-white 66
Image is rotated 90 degrees 67
Windows printing problems 67
Image never prints 67
Blue color on the screen is printing too purple. 67
Printing from Windows 3.1 produces the message “Problem writing
device LPT1: Cancel or Retry”. 68
Workstation printing problems 68
Image never prints 68
Running built-in diagnostics 69
Adjustments 73
Printing test prints 73
Print service test prints 73
Printing the configuration page 73
Printing the demonstration pages 73
Print engine calibration 74
Adjusting for impulse banding 74
Cleaning and Maintenance 77
Service preventive maintenance procedure 77
Recommended tools 77
Cleaning 78
Resetting NVRAM 79
Service Guide
ix
Key FRU Disassembly 81
Paper feeder 82
Feeder registration chute 83
Feeder registration clutch 84
Registration brake clutch 85
Feeder metal registration roller 86
Feeder rubber registration roller 87
Feeder pre-registration clutch 88
Feeder pre-registration rollers 89
Paper-pick turn roller 91
Paper feed drive gear train 92
Paper-feed motor 93
Multi-purpose tray roller assembly 94
Multi-purpose tray pick rollers 95
Auto-density calibration sensor 97
Developer assembly 99
Developer clutch 101
Developer tie plate 102
Toner/developer dispense motor 104
Carousel assembly 105
Carousel motor 107
Carousel motor board 108
Carousel sensor 109
Laser unit 110
Erase lamp rail assembly 112
Erase lamp 114
Process drive unit 115
Waste auger assembly 117
Accumulator belt assembly 119
Accumulator belt cleaner assembly 121
Second bias transfer roller assembly 122
Second bias transfer roller cam assembly 123
Fuser assembly 125
Fuser drive gear train 126
Lower exit assembly 128
Full stack sensor 130
Low voltage power supply 131
High voltage power supply 132
Image processor 133
Image processor chassis 134
Print engine control board 135
x
Phaser 780 Color Printer
FRU List 137
Supplies and accessories 176
Test Prints 179
Wiring Diagrams 185
Service Guide
xi
Figures
The Phaser 780 printer (shown with optional Lower Tray Assembly) 1
Internal features of the print engine 5
Circuit boards of the print engine 6
Motors of the print engine 7
Sensors and switches on the print engine 8
Solenoids and clutches on the print engine 9
Features of the image processor board 10
Printer front panel 11
Printer rear panel with the optional Ethernet card 13
Adjusting for impulse banding 75
Removing the paper feeder 82
Removing the registration chute 83
Removing the registration clutch 84
Removing the registration brake clutch 85
Removing the metal registration roller 86
Removing the rubber registration roller 87
Removing the feeder pre-registration clutch 88
Removing the feeder pre-registration roller 90
Removing the paper-pick turn roller 91
Removing the paper-feed drive gear train 92
Removing the paper-feed motor 93
Removing the multi-purpose tray roller assembly 94
Removing the multi-purpose tray pick rollers 96
Removing the auto-density calibration sensor 98
Removing a developer assembly 100
Removing the developer clutch 101
Removing the developer tie plate 103
Removing the toner/developer dispense motor 104
Removing the carousel assembly 106
Removing the carousel motor 107
Removing the carousel motor board 108
Removing the carousel sensor 109
Removing the laser unit 111
Removing the erase lamp rail assembly 113
Removing the erase lamp 114
Removing the process drive unit 116
Removing the waste auger assembly 118
Removing the accumulator belt assembly 120
Removing the accumulator belt cleaner assembly 121
Removing the second bias transfer roller assembly 122
xii
Phaser 780 Color Printer
Removing the second bias transfer roller cam assembly 124
Removing the fuser assembly 125
Removing the fuser-drive gear train 127
Removing the lower exit assembly 129
Removing the stack full sensor 130
Removing the low voltage power supply 131
Removing the high voltage power supply 132
Removing the image processor 133
Removing the image processor chassis 134
Removing the print engine control board 135
Printer cabinet FRUs 138
Paper feeder FRUs 140
Multi-purpose tray cover FRUs 142
Multi-purpose tray FRUs 144
Paper feeder cover FRUs 146
Paper feeder FRUs 148
Imaging FRUs 150
Developer FRUs 152
Carousel FRUs 154
Accumulator belt assembly FRUs 156
Fuser assembly FRUs 158
Paper exit FRUs 160
Paper exit FRUs 162
Drive FRUs 164
Electronic (rear) FRUs 166
Electronics (front) FRUs 168
Image processor FRUs 170
Optional lower feeder cabinet FRUs 172
Optional Feeder FRUs 174
Print engine wiring diagram 185
Map 1 – Wiring routing at the top and front of the printer 193
Map 2 – Wire routing around the engine control board 194
Map 3 – Wiring routing around the image processor board 195
Map 4 – Wiring routing around the paper feeder 196
Map 5 – Wire routing around the laser scanner and high voltage power supply 197
Map 6 – Wire routing at the rear of the printer 198
Map 7 – Wire routing around the power supply 199
Map 8 – Wire routing around the fuser 200
Wiring 1 – Low voltage power supply, laser unit, and interlock switches 201
Wiring 2 – Engine control board, auto-density calibration sensor, erase lamp, waste
toner sensor 202
Wiring 3 – Low voltage power supply, engine control board, high-voltage power
supply and imaging components 203
Service Guide
xiii
Wiring 4 – Engine control board, used cartridge sensor, cartridge sensor, carousel
sensor, developer clutch, developer fan, toner dispense motor 204
Wiring 5 – Engine control board, low voltage power supply, carousel motor board,
rotary motor 205
Wiring 6 – Engine control board, low voltage power supply, bias transfer roller cam
solenoid accumulator belt sensor, paper feeder motor, process motor 206
Wiring 7 – Engine control board, low voltage power supply, fuser, oil roll assembly
207
Wiring 8 – Engine control board, fuser assembly, environment sensor 208
Wiring 9 – Engine control board, paper size switch board, feed solenoid, no paper
sensor, low paper sensor 209
Wiring 10 – Engine control board, paper feeder 210
Wiring 11 – Engine control board, paper feeder, multi-purpose tray 211
Wiring 12 – Engine control board, top exit sensor, media exit switch, full stack sensor,
fuser fan 212
Wiring 13 – Engine control board, image processor board, front panel, image processor
fan 213
Wiring 14 – Lower Tray Assembly master wiring diagram 214
Wiring 15 – Engine control board and low voltage power supply to Lower Tray
Assembly feeder board 215
Wiring 16 – Lower Tray Assembly feeder board to feeder chute switch, size switches
and feeder motor 216
Wiring 17 – Lower Tray Assembly feeder board to no paper sensors and low paper
sensors 217
Wiring 18 – Lower Tray Assembly feeder board to feed solenoids and turn chutes 218
xiv
Phaser 780 Color Printer
Tables
Memory and features sets 3
Physical dimensions of printer 14
Physical dimensions of lower tray feeder 14
Printer clearances 14
Functional specifications 15
Electrical specifications 16
Environmental specifications 16
Diagnostic tests 69
Printer cover FRUs 139
Paper feeder FRUs 141
Multi-purpose tray cover FRUs 143
Multi-purpose tray FRUs 145
Paper feeder cover FRUs 147
Paper feeder FRUs 149
Imaging FRUs 151
Developer FRUs 153
Carousel FRUs 155
Accumulator belt assembly FRUs 157
Fuser assembly FRUs 159
Paper exit FRUs 161
Paper exit FRUs 163
Drive FRUs 165
Electronic (rear) FRUs 167
Electronic (front) FRUs 169
Image processor FRUs 171
Optional lower feeder cabinet FRUs 173
Optional feeder FRUs 175
Supplies and accessories 176
Plug/Jack Locations - 1 186
Plug/Jack Locations - 2 187
Plug/Jack Locations - 3 188
Plug/Jack Locations - 4 189
Plug/Jack Locations - 5 190
Plug/Jack Locations - 6 191
Plug/Jack Locations - 7 192
Service Guide
1
General Information
This service guide contains information useful to verify operation, troubleshoot,
repair, adjust, and maintain a Tektronix Phaser® 780 Color Printer.
To ensure complete understanding of the product, we recommend participation
in Phaser 780 service training, if available.
The Phaser 780 printer (shown with optional Lower Tray Assembly)
3041-01
2
Phaser 780 Color Printer
Phaser 780 overview
The Phaser 780 Color Printer combines a color laser, continuous-tone print engine
with an image processor supporting Adobe’s PostScript 3 page description
language. The image processor features a bi-directional parallel interface and a
10baseT Ethernet port for host communication. Optional network adapter cards
to the image processor allow the printer to communicate on networks using
LocalTalk, Ethernet 100baseT or Token Ring protocols. The Ethernet network
card supports EtherTalk 100baseT, Novell and TCP/IP. With the Token Ring
network card, the printer supports Token Ring protocols. The network cards are
sometimes referred to as “smart cards” because each houses its own processor for
executing specific on-board protocols; only data is transferred from the installed
smart card to the printer’s image processor board. The PCL printer language is
also supported.
The printer is marketed in three versions:
The
Phaser 780 N
(Standard) comes standard with 64 Mbytes of RAM. The
printer contains 136 standard, built-in fonts. The standard Phaser 780 prints at a
resolution of 600 x 600 dots-per-inch on A and B-size media. The base printer
does not support grayscale printing.
The
Phaser 780 GN
(Graphics) features 96 Mbytes of RAM and can print at
600 x 1200 dpi. It also contains 136 fonts. The graphics printers supports 16 level
grayscale printing as well as printing oversize-B images.
The
Phaser 780 P
(Plus) features 192 Mbytes of RAM and supports the same
features as the GN printer. In addition, the Plus version Phaser 780 supports
image pipelining for greater throughput, a print collation mode, and a “check
print before proceeding with job” mode. The plus printer also feature a SCSI-
compatible interface to connect to an external hard disk drive for additional font
storage. The hard disk drive is also required for print collation of multiple copy
multi-page prints. A scanner can also be connected to the Plus printer’s SCSI port
to give the printer the ability to optically copy color images.
RAM memory in the printers can be supplemented with one or two additional 32-
, 64-, or 128-Mbyte RAM DIMMs; the maximum usable capacity is 192 Mbytes
Print speeds depend on the chosen resolution and selected media. For resolutions
of 600 x 600 (standard), in color, the printer prints at 4 A-size pages per minute
(ppm) on paper. Monochrome printing (Fast Monochrome) is at 16 ppm on paper.
Transparency film printing is always 2 ppm.
The printers support printing on A-, A4-, A5-, B-, B4, B5, SRA3, A3-, 13 x 19 in.
and Legal-sized paper from a 250-sheet tray. An optional three-tray second feeder
(called the Lower Tray Assembly) is available with additional 250-sheet standard
media trays. The printer features a built-in multi-purpose tray from which
specialty media, cardstock and envelopes can be fed. The printer also supports
manual feeding using the multi-purpose tray.
After being idle for the selected amount of time the printer switches into its
Energy Star mode where it consumes less than 45 watts of power. It “awakens”
upon receiving data at any of its ports.
Service Guide
3
Memory considerations
The base printer features 32 Mbytes of RAM in one connector and features two
additional DIMM connectors which accept 16-, 32-, 64-, or 128 Mbytes RAM
DIMMs. The printer can use any off-the-shelf RAM meeting these specifications:
■
168 pin DIMM
■
Synchronous DRAM
■
3.3 volt
■
9 nsec speed
■
Valid on-board Serial Presence Detect ROM.
Upon power-up, the image processor interrogates the 256 byte Serial Presence
Detect ROM which describes the DIMM in great detail, with details such as data
width, clock delay, number of address columns and row, refresh rate and more. If
the DIMM does not meet the required specifications it will be ignored; no error
message will be reported.
With more memory the printer gains the capabilities of printing at higher
resolutions, printing without having to use image compression (which trades off
less installed RAM for longer image processing time) and dual frame buffers for
printing one image while processing a second image (which gives greater
printing throughput). With additional RAM memory, the printer’s capabilities
increase as detailed in the following table:
Table 1 Memory and features sets
Configuration/ options “Standard”
printer
w/ 64 Mbyte
RAM
“Graphics”
printer
w/ 96 Mbyte
RAM
“Plus” printer
w/ 192 Mbyte
RAM
600 x 600 with full image
area Yes Yes Yes
600 x 1200 with full
image area No Yes Yes
Check Print/ PhaserMatch No No Yes
Job Pipelining No No Yes - 2 pages
Parallel port buffer 256 kbytes 256 kbytes 512 kbytes
Print Collation - requires
hard drive option No No Yes
Fonts available 136 136 136
4
Phaser 780 Color Printer
Print the Configuration Page and check the item “installed RAM” to see what
type of RAM is installed.
For example:
Installed RAM: 96 Mbytes
Mem slot 1: SDRAM/parity/64 MB/KMM366S824AT
Mem slot 1: empty
This is a list of DRAM SIMMs that are branded for use by Tektronix at the time
this guide was published:
Size Maker Part Number
16 Mbyte Samsung KMM366S203BT
32 Mbyte Samsung KMM366S403BT
64 Mbyte Samsung KMM366S824AT
128 Mbyte Samsung KMM366S1623AT
32 Mbyte Smart Module SM564043574N6AA
64 Mbyte Smart Module SM564088574N6AA
32 Mbyte NEC MC-454AD645F-A10B
64 Mbyte NEC MC-454CB645FA-A10B
128 Mbyte NEC MC-4516CD645FZ-A10B
16 Mbyte Micron Tech. MT8LSDT264AG-66CL2
32 Mbyte Micron Tech. MT16LSDT264AG-10BC4
32 Mbyte Micron Tech. MT16LSDT264AG-662C1
64 Mbyte Micron Tech. MT8LSDT864AG-662D3
64 Mbyte Micron Tech. MT8LSDT864AG-10BD2
128 Mbyte Micron Tech. MT16LSDT1664AG-662DT
Service Guide
5
Print engine assemblies
Internal features of the print engine
Laser
unit
Paper
feeder
Multi-purpose
tray
Imaging unit
Carousel
assembly
Fuser
Accumulator
belt cleaner
Accumulator
belt assembly
Second bias
transfer roller
Media
tray 1
3041-02
Developer
assemblies
6
Phaser 780 Color Printer
.
Circuit boards of the print engine
Low Voltage
Power Supply (LVPS)
High Voltage
board
Carousel
motor
board
Network
card
Engine
control
board
Image
processor
board
3041-04
Service Guide
7
Motors of the print engine
3041-03
Toner
dispense
motor
Image processor
fan
Fuser fan
Paper feed
motor
Process
motor
Paper
feed drive
gear train
Carousel
motor
Developer fan
Process drive
assembly
8
Phaser 780 Color Printer
Sensors and switches on the print engine
Long paper
sensor
Edge
sensor
Multi-purpose
tray paper
present sensor
3041-05
Environment
sensor
Fuser exit
s
ensor
Left front
cover
switch
Full
stack
sensor
Auto-density
calibration
sensor
Top cover
switch
Right front
cover switch
Exit door
sensor
Exit
s
ensor
Used toner
c
artridge
s
ensor
Carousel
sensor
Registration
sensor
Waste cartridge
full sensor
Waste cartridge
sensor
Low paper
sensor
Paper empty
sensor
Paper size
sensor
Accumulator
belt home
sensor
Toner
cartridge
presence
sensor
F
user
t
emperature
s
ensor
Service Guide
9
Solenoids and clutches on the print engine
Registration
clutch
Pre-Registration
clutch
Registration
brake clutch
Multi-purpose
tray clutch
Multi-purpose
pick-up solenoid
Second bias
transfer roller
solenoid
Developer clutch
3041-06
10
Phaser 780 Color Printer
The image processor
Features of the image processor board
RAM
DIMMS
Font
DIMM Postscript
code ROM
DIMM
Network
card
SCSI
riser
card
NVRAM
Boot
ROM
Real Time Clock / NVRAM
3041-07
Service Guide
11
Front panel
These front panel features are found on the printer:
■
A two-line, 40-character LCD
■
Six push buttons
■
Five LEDs
LCD.
The LCD serves two purposes: Displaying current image processor and
print engine status information and displaying an interactive menu. Status
information includes image processor status such as
Ready
,
Processing
and
Printing
. Print engine status includes messages such as
Out of paper
,
Paper
Jam
, and
Toner Low
.
The interactive menu can only be entered while the printer is idle and ready. The
interactive menu has two modes, review and modify. Customers can review and
modify certain NVRAM, I/O ports and peripheral parameters.
Buttons.
Button 6, the left-most button, is an
Exit
key used to cancel an operation
while in the interactive menu. The functions of the remainder of the buttons are
defined by the particular menu or function being displayed on the LCD. The
bottom row of the LCD labels the current function of each button.
Printer front panel
Ready
Print Menu Select
3041-18
12
Phaser 780 Color Printer
Rear panel
Connectors
The rear panel of the printer features the host interface connectors:
■
Bi-directional parallel (high-density connector).
■
Twisted Pair 10baseT Ethernet connector. RX indicator (green);
blinks
while the network card is receiving data. The LED is
off steady
while no
data is being received. If the LED is
on
steady
, then a problem (probably
hardware) has occurred at the network hub.
■
SCSI high-density connector (external hard disk drive or optical scanner
only).
With the addition of a network card, the printer can feature either of these groups
of connectors:
■
ThinNet (100base2) and Twisted Pair (100baseT) Ethernet connectors.
This is Option P1.
■
LocalTalk connector. This is Option P3.
■
Unshielded Twisted Pair (10baseT) and shielded Twisted Pair (DB-9)
Token Ring connectors. This is Option P4.
Network card LEDs
The Ethernet network card has four LED indicators:
■
TX indicator (yellow); blinks while data is transmitted to the host. The
LED is off while no data is being sent.
■
Twisted Pair (100baseT) and ThinNet (100base2)
.
RX indicator (green);
blinks
while the network card is receiving data. The LED is
off steady
while no data is being received. If the LED is
on
steady
, then a problem
(probably hardware) has occurred at the network hub.
■
TP Link. On steady indicates good circuit to nearest port; off indicates
no circuit.
■
100 MBS. Ethernet speed is 100 MBS when lit.
Note
Do not use both Ethernet connectors at the same time. With a
Ethernet or Token Ring network card installed, the 10baseT port
is disabled.
Service Guide
13
The Token Ring network card has two LED indicators:
■
Connection (yellow);
off
when the printer is not inserted into the Token
Ring,
blinks
while the printer is attempting to insert itself into the Token
Ring,
on
when the printer is properly inserted in the ring.
■
Ring Speed (green);
off
when the card is set for 4 megabits-per-second
(MBPS),
on
when the card is set for 16 MBPS.
■
When both LEDs blink, a network card failure has occurred.
The following figure illustrates the rear panel of the printer.
Printer rear panel with the optional Ethernet card
3041-08
SCSI port
Parallel port
10 base T ethernet port
Slot for network card & IDE hard drive
Ethernet
card LocalTalk
card Token Ring
card Internal
hard drive
100
Mbs
10/100Base-TX 10Base2
TP
LINK
TX
RX
PhaserShareTM
Series B
Ethernet Card
PhaserShareTM
Series B
Token Ring Card TX
RX
INS
16
Mbs
STP UTP
TX
RX LocalTalk®
PhaserShareTM
Series B
LocalTalk Card
14
Phaser 780 Color Printer
Specifications
Table 1 Physical dimensions of printer
Dimension Value
Height 49.2 cm (19 in) without lower tray feeder
90.6 (36 in) with lower tray feeder
Width 69.1 cm (27.2 in)
Depth 64.1 cm (24.2 in)
Weight 73.6 kg (161 lbs) with consumables installed
97.1 kg (213 lbs) with lower tray feeder and consumables
Table 2 Physical dimensions of lower tray feeder
Dimension Value
Height 41.4 cm (16.3 in)
Width 56 cm (22 in)
Depth 56 cm (22 in)
Weight 23.5 kg (52 lbs)
Table 3 Printer clearances
Dimension Value
Top 40.0 cm (15.7 in)
Left 50.3 cm (20 in)
Right 55.1 cm (21.5 in)
Front 83.5 cm (33 in)
Rear
15.0 cm (6 in)
Bottom No obstructions underneath that could block cooling vents
Mounting surface flatness Front feet less than 5 mm above or below rear feet
Left feet less than 10 mm above or below right feet
Mounting surface dimensions
Level surface with dimensions of at least 79 cm (31 in.) by
152 cm (60 in.).
Service Guide
15
Table 4 Functional specifications
Characteristic Specification
Printing process Electro-photographic, four color (CMYK), two transfer printing using
modulated (on/off) laser beam scanning. Imaged is fused to paper
using heat and pressure with silicone oil lubricant.
Color medium Four toner cartridges each containing one of four colors: cyan,
magenta, yellow or black. The toner is a nonmagnetic, dual
component contact medium.
Addressability 600 x 600 dpi and 600 x 1200 dpi
Print speed Time from paper load to paper eject:
A-size:
Four color: 4 pages per minute
Monochrome: 16 pages per minute
Transparency: 2 pages per minute
B-size:
Four color: 2 pages per minute
Monochrome: 8 pages per minute
Transparency: 1 page per minute
Minimum margins
5 mm(0.2 in.) on all sides, except for Tabloid Plus (13 x 19 in.)
media which has a bottom margin of 25 mm (1 in.)
Usable papers sizes
Paper
:
Envelope
:
3.5x5.5, minimum size US #10
8.5x11, Letter Euro Standard
8.5x14, Legal A4
11x17, Tabloid C4
12x18, Tabloid Extra C5
13x19, Tabloid Plus C6
A3 C65
A4
A5
B4
B5
Avery label: 5164, 5663, 7330, 7348
Usable paper weights 75 to 105 g/m
2
(20 to 24 lb) thru paper tray.
64 to 220 g/m
2
(80 lb) using the multi-purpose tray
Tray capacities Main tray:
Standard paper: 250 sheets
Transparency: 100 sheets
Lower feeder trays:
Standard paper: 250 sheets
Multi-purpose tray:
Standard paper/Letterhead: 150 sheets
Transparency: 50 sheets
Label: 50 sheets
Postcard: 75
Envelope: 30
Glossy/Coated: 75
Index: 30
Fabric Transfer: one at a time
16
Phaser 780 Color Printer
Table 5 Electrical specifications
Characteristic Specification
Primary line voltage 100/120 VAC (+/- 10%)
220/240 VAC (+/- 10%)
Primary voltage frequency
range 47 to 63 Hz
Power consumption EnergyStar: 20 watts
Standby: 100 watts
1000 watts with fuser on
Ready: 100 watts
1000 watts with fuser on
Printing: 1100 watts
Table 6 Environmental specifications
Characteristic Specification
Temperature:
Operating
Non-operating
Storage
0 to 32
o
C (41 to 90
o
F)
-20 to40
o
C (-4 to 104
o
F)
-20 to40
o
C (-4 to 104
o
F)
Humidly:
Operating
Non-operating
Storage
15 to 85% relative humidity
5 to 85% relative humidity
5 to 85% relative humidity
Altitude
Operating:
Non-operating 0 to 3000 m (9900 ft.) at 25oC
0 to 15000 m (50,000 ft.)
Vibration
Operating:
Non-operating
Shock-non-operating
Will withstand 0.5G excitation, 5 to 100 Hz, 3 axes for up to 50 minutes
with no impairment or subsequent damage.
0.5 g, 25 minute sweep, 5-100 Hz, 100-200 sec/sweep cycles
The printer may have any corner raised and dropped 5 cm (2 in.)
without impairment of operation.
Acoustic Noise
Idle:
Printing: 38.3 db
54.8 db with impulse noise of 63.3 db
Service Guide 17
Regulatory specifications
Safety
■EN60950 CB Report by Third Party GOST and TUV certification
■UL1950 Nationally Recognized Test Lab (NRTL) certified
■CSA 950 SCC recognized test lab certified
EMC
■EN55022 (CISPR 22) Class B
■EN50082-1:1994 Susceptibility
■EN61000-3-2 AC Mains Harmonic Distortion
■EN61000-3-3 AC Mains Voltage Flicker
■EN61000-4-2:1993 ESD
■EN61000-4-4:1993 Fast Burst Transients
■EN61000-4-5:1993 Line Surge
■EN61000-4-11;1993 Voltage Dips and Interruptions
■ENV50140:1993 Radiated RF Immunity
Energy Star certification
After 1-hour period of inactivity, the printer enters an standby mode, as required
by Energy Star. The wait time is a user-definable parameter (via the front panel or
by using PhaserLink). Energy Star default is “ON” and the time-out default is
one hour. The printer enters a READY condition within 5 minutes after power-
on.
.
18 Phaser 780 Color Printer
Service Guide
19
Error Codes and
Messages
The following table list error codes and messages reported by the print
engine control board.
Error code
and
message
Description Corrective action
Laser Unit
Error
(Error 10)
There is a problem with the laser unit.
The engine control board did not receive
a signal from the laser start-of-scan
sensor within the specified time
1.
Test the top cover and right
front cover switches for
proper operation. Power for
the laser unit is routed
through both switches
2.
Replace the laser unit.
3.
Replace the engine control
board
Image
Density Error
(Error 11)
The image density readings indicate a
problem. The engine control board
detected that the printer image density
was unusually low and attempts to raise
the density have failed.
Note
If the top cover is removed,
light can leak into the printer
and cause a auto-density
calibration sensor error.
1.
Power cycle the printer
2.
Inspect the toner cartridges.
3.
Inspect the four developer
housings. Each magnetic
roller should be evenly
coated with toner. Replace a
suspect developer assembly.
4.
Test the toner/developer
dispense motor. Replace it if
it does not run
5.
Inspect and reseat the
auto-density calibration
sensor. Ensure the senor’s
solenoid-activated cleaning
blade is in place and moves
freely.
6.
Test the auto-density
calibration sensor. If bad,
replace the auto-density
calibration sensor
7.
Replace the imaging unit
8.
Replace the engine control
board
9.
Replace the high voltage
board
20
Phaser 780 Color Printer
Image
Density Error
(Error 12)
The image density readings indicate a
problem. The engine control board
detected that the printer image density
was unusually high and attempts to
lower the density have failed.
1.
Power cycle the printer
2.
Ensure the toner cartridges
are fully functional and
relatively full of toner.
3.
Test the toner dispense
motor.
4.
Check the auto-density
calibration sensor for
contamination from toner.
Replace the sensor, if
necessary.
5.
Inspect and reseat the
auto-density calibration
sensor. Ensure the senor’s
solenoid-activated cleaning
blade is in place and moves
freely.
6.
Test the auto-density
calibration sensor. If bad,
replace the auto-density
calibration sensor
7.
Replace the engine control
board
8.
Inspect the four developer
housings. Each magnet
roller should be evenly
coated with toner. Replace a
suspect developer assembly.
9.
Replace the imaging unit
10.
Replace the high voltage
board
Error code
and
message
Description Corrective action
Service Guide
21
Auto-
density
Calibration
Error
(Error 13)
There is problem with the auto-density
calibration. The engine control board
detected that the auto-density
calibration sensor LED output signal is
below specified range.
1.
Power cycle the printer
2.
Check the auto-density
calibration sensor for
contamination from toner.
Replace the sensor, if
necessary.
3.
Inspect and reseat the
auto-density calibration
sensor. Ensure the senor’s
solenoid-activated cleaning
blade is in place and moves
freely.
4.
Test the auto-density
calibration sensor. If bad,
replace the auto-density
calibration sensor
5.
Replace the engine control
board
6.
Replace the low voltage
power supply
Toner
Carousel
Error
(Error 21)
There is a problem with the carousel
home sensor. The engine control board
detected that the carousel home sensor
did not actuate within six seconds after
the start of the carousel motor.
1.
Power cycle the printer
2.
Manually rotate the carousel
assembly several revolutions
3.
Check for contamination that
may cause binding.
4.
Test the carousel home
sensor. Replace if needed
5.
Replace the carousel motor
6.
Replace the engine control
board
PCDC Error
(Error 22) There is a problem with PCDC
calibration. The engine control board
detected that PCDC calibration value is
much lower than set specifications.
1.
Power cycle the printer
2.
Inspect the process drive.
Ensure the drum rotates
3.
Replace the engine control
board
4.
Replace the image processor
board
Environment
Sensor Error
(Error 23)
There is a problem with the environment
sensor circuit. The engine control board
detected an open environment sensor
circuit
1.
Power cycle the printer
2.
Replace the environment
sensor
3.
Replace the engine control
board
Error code
and
message
Description Corrective action
22
Phaser 780 Color Printer
Second Bias
Transfer
Roller Error
(Error 24)
The engine control board detected that
the measured current value thru the
second bias transfer roller was not within
specification.
1.
Check the wiring from the
high voltage power supply to
the second bias transfer roller
2.
Replace the second
bias transfer roller
3.
Replace the high
voltage power supply
4.
Replace the
accumulator belt
assembly
5.
Replace the engine
control board
Fuser
Temperature
Error
(Error 40)
There is a problem with the temperature
of the fuser. The engine control board
detected that the fuser temperature did
not reach 110˚C within six minutes after
the printer was turned on.
1.
Open the fuser door and
ensure the fuser connectors
are properly seated.
2.
Close the fuser and power
cycle the printer. Check that
the fuser heats up
3.
Check for line voltage at P/J
71 pins 1 and 2. If no voltage
is present replace the power
supply
4.
Replace the fuser
5.
Replace the engine control
board
Fuser
Temperature
Error
(Error 41)
There is a problem with the fuser heat
rod control. The engine control board
detected that the fuser heat rods
remained on longer than the specified
time.
1.
Open the fuser door and
ensure the fuser connectors
are properly seated.
2.
Close the fuser and power
cycle the printer. Check that
the fuser heats up
3.
Check for line voltage at P/J
71 pins 1 and 2. If no voltage
is present replace the power
supply
4.
Replace the fuser
5.
Replace the engine control
board
Error code
and
message
Description Corrective action
Service Guide
23
Fuser
Temperature
Error
(Error 42)
There is a problem with the fuser. The
engine control board senses an open
temperature sensor circuit.
1.
Open the fuser door and
ensure the fuser connectors
are properly seated.
2.
Close the fuser and power
cycle the printer. Check that
the fuser heats up
3.
Check for line voltage at P/J
71 pins 1 and 2. If no voltage
is present replace the power
supply
4.
Replace the fuser
5.
Replace the engine control
board
Fuser
Temperature
Error
(Error 43)
There is problem with the fuser. The
engine control board detected that the
fuser did not reach ready temperature
during the specified time.
1.
Open the fuser door and
ensure the fuser connectors
are properly seated.
2.
Close the fuser and power
cycle the printer. Check that
the fuser heats up
3.
Check for line voltage at P/J
71 pins 1 and 2. If no voltage
is present replace the power
supply
4.
Replace the fuser
5.
Replace the engine control
board
Fuser
Temperature
(Error 44)
The thermistor sensor indicates that the
fuser had reached the set overheat
temperature, The engine control board
has shutdown fuser temperature
operation.
1.
Allow the fuser to cool for 30
minutes
2.
Ensure the fuser wiring
harnesses are plugged in.
3.
Check the fuser fan
4.
Replace the fuser
5.
Replace the engine control
board
6.
Replace the low voltage
power supply
Error code
and
message
Description Corrective action
24
Phaser 780 Color Printer
Process
Motor Error
(Error 61)
There is a problem with the process
motor. the engine control board did not
receive a signal from the accumulator
belt home sensor signal in the specified
time.
1.
Test the process drive
assembly
2.
Test the +24 VDC at P/J
32-11 and frame ground.
3.
Test the accumulator belt
home sensor
4.
Replace the process motor.
5.
Replace the accumulator belt
assembly
6.
Replace the engine control
board
7.
Replace the imaging unit
Paper
Handling
Motor Error
(Error 62)
There is a problem with the paper feed
motor. The engine control board
received a failed signal from the paper
feed motor circuitry.
1.
Power cycle the printer
2.
Replace the paper feed
motor
3.
Replace the engine control
board
4.
Check for mechanical binding
in the paper feed drive gear
train
Imaging Unit
ID Error
(Error 69)
The engine control board detected a
used CRUM
1.
Reseat the imaging unit
2.
Power cycle the printer
3.
Replace the imaging unit
4.
Replace the engine control
board
Imaging Unit
ID Error
(Error 70)
There is a CRU Memory problem. The
engine control board detected that the
memory initial value of the installed
imaging unit is wrong.
1.
Reseat the imaging unit
2.
Power cycle the printer
3.
Replace the imaging unit
4.
Replace the engine control
board
Imaging Unit
ID Error
(Error 71)
An incompatible imaging unit is installed
in the printer. The engine control board
detected that the memory device in the
installed imaging unit is incompatible
with the printer.
1.
Power cycle the printer
2.
Reseat the imaging uni
3.
Switch the printer power off,
then on
4.
Replace the engine control
board
Imaging Unit
Count Error
(Error 72)
There is a CRU memory problem. The
engine control board could not read the
CRUM counter value.
1.
Power cycle the printer
2.
Replace the imaging unit with
a new cartridge
3.
Replace the engine control
board
Error code
and
message
Description Corrective action
Service Guide
25
Imaging Unit
ID Error
(Error 73)
The wrong imaging unit is installed in
the printer. The engine control board
detected that the installed imaging unit
is incompatible with the printer.
1.
Power cycle the printer
2.
Replace the imaging unit with
a new cartridge
3.
Replace the engine control
board
Imaging Unit
Comm Error
(Error 74)
There is a CRU memory problem. The
engine control board could not write to
the CRUM.
1.
Power cycle the printer
2.
Reseat the imaging unit in the
printer
3.
Replace the imaging unit with
a new cartridge
4.
Replace the engine control
board
Imaging Unit
Comm Error
(Error 75)
There is a CRU Memory problem. The
engine control board could not
communicate with the CRUM.
1. Power cycle the printer
2. Replace the imaging unit with
a new cartridge
3. Replace the engine control
board
Engine
Board Error
(Error 76)
The engine control board detected a
corrupted NVRAM during power-on self
test
1. Power cycle the printer
2. Replace the NVRAM
chip
3. Replace the engine control
board
ROM/
RAM Error
(Error 77)
There is a problem in reading
information from ROM or RAM on the
engine control board. The engine control
board could not read information on the
ROM or RAM.
1. Power cycle the printer
2. Check if +5 VDC is supplied
at P/J33-3 and frame ground.
If not, replace the low voltage
power supply
3. Replace the engine control
board
Error code
and
message
Description Corrective action
26 Phaser 780 Color Printer
Image
Contains Too
Much
Coverage
Image density exceeded design
specifications.
The engine control board detected that
the first 70mm of the lead edge of the
four color image about to be printed
exceeds the design specification for total
image density. The specification is 280%
or less image density. For example, a
density setting of 100% for each of the
four colors creates a layered four color
image with a combined density of 400%.
1. Power cycle the printer
2. Print a less complex, color
image to determine if it is
overly dense.
3. Replace the engine control
board
Replace
Fuser Roll
Cartridge
The fuser oil roll has reached end of life.
The engine control board detected that
the fuser oil roll has processed the
equivalent of 20,000 sheets of paper
since it was installed.
1. Replace the fuser roll
cartridge
2. Power cycle the printer
3. Ensure the fuser connectors
are properly seated
4. Test the fuser using internal
diagnostics
5. Replace the engine control
board
Waste
Cartridge
Full
The waste cartridge is full. The engine
control board detected that the waste
cartridge sensor was on for 1250 print
cycles.
1. Replace the waste cartridge
2. Test the waste cartridge full
sensor using internal
diagnostics
3. Inspect the electrical
contacts and wiring Replace
the waste cartridge full
sensor
4. Replace the engine control
board
Replace
Black Toner
Cartridge
Black image density is too low. The
engine control board detected that the
auto-density calibration sensor reads
the black patch density as being below
specification and that the reading is
either slow to raise or does not raise
after the printer attempts to increase
density.
1. Replace the black toner
cartridge
2. Test the toner/developer
dispense motor
3. Test the auto-density
calibration sensor
4. Replace the engine control
board
Error code
and
message
Description Corrective action
Service Guide 27
Replace
Cyan Toner
Cartridge
Cyan image density is too low. The
engine control board detected that the
auto-density calibration sensor reads
the cyan patch density as being below
specification and that the reading is
either slow to raise or does not raise
after the printer attempts to increase
density.
1. Replace the cyan toner
cartridge
2. Test the toner/developer
dispense motor
3. Test the auto-density
calibration sensor
4. Replace the engine control
board
Replace
Magenta
Toner
Cartridge
Magenta image density is too low. The
engine control board detected that the
auto-density calibration sensor reads
the magenta patch density as being
below specification and that the reading
is either slow to raise or does not raise
after the printer attempts to increase
density.
1. Replace the magenta toner
cartridge
2. Test the toner/developer
dispense motor
3. Test the e auto-density
calibration sensor
4. Replace the engine control
board
Replace
Yellow Toner
Cartridge
Yellow image density is too low. The
engine control board detected that the
auto-density calibration sensor reads
the yellow patch density as being below
specification and that the reading is
either slow to raise or does not raise
after the printer attempts to increase
density.
1. Replace the yellow toner
cartridge
2. Test the toner/developer
dispense motor
3. Test the auto-density
calibration sensor
4. Replace the engine control
board
Replace
Imaging Unit The imaging unit has reached end of life.
The engine control board detected that
the installed imaging unit has reached
end of life.
1. Replace the imaging unit
2. Switch the printer power off,
then on
3. Inspect the CRUM for
damage or contamination.
clean or replace if necessary.
4. Replace the engine control
board
Fuser Roll
Cartridge
Low
The fuser oil roll is nearing end of life.
The engine control board detected that
the fuser oil roll is nearing the 20,000
mark.
1. Replace the fuser oil roll
2. Replace the engine control
board
Error code
and
message
Description Corrective action
28 Phaser 780 Color Printer
Waste
Cartridge
Almost Full
The waste toner box is almost full. The
engine control board detected that the
waste toner box is almost full and will
soon need to be replaced.
1. Replace the waste toner box
2. Replace the engine control
board
Black Toner
Low The black toner cartridge is low on toner.
The engine control board switched on
the dispense motor for more than 980
seconds in order to raise the image
density to normal.
1. Replace the black toner
cartridge
2. Test the dispense motor
3. Test the auto-density
calibration. Replace it, if
necessary.
4. Replace the engine control
board
Cyan Toner
Low The cyan toner cartridge is low on toner.
The engine control board switched on
the Dispense Motor for more than 800
seconds in order to raise the image
density to normal.
1. Replace the cyan toner
cartridge
2. Test the dispense motor
3. Test the auto-density
calibration. Replace it, if
necessary.
4. Replace the engine control
board
Magenta
Toner Low The magenta toner cartridge is low on
toner. The engine control board switched
on the Dispense Motor for more than
800 seconds in order to raise the image
density to normal.
1. Replace the magenta toner
cartridge
2. Test the dispense motor
3. Test the auto-density
calibration. Replace it, if
necessary.
4. Replace the engine control
board
Yellow Toner
Low The yellow toner cartridge is low on
toner. the engine control board switched
on the Dispense Motor for more than
1150 seconds in order to raise the
image density to normal.
1. Replace the yellow toner
cartridge
2. Test the dispense motor
3. Test the auto-density
calibration. Replace it, if
necessary.
4. Replace the engine control
board
Error code
and
message
Description Corrective action
Service Guide 29
Media Low in
Tray 4 The engine control board detected that
the tray 4 low paper sensor is actuated. 1. Add paper to tray 4
2. Check for a damaged or
missing sensor actuator.
3. Replace the tray 4 low sensor
4. Replace the engine control
board
Media Low in
Tray 3 The engine control board detected that
the tray 3 low paper sensor is actuated. 1. Add paper to tray 3
2. Check for a damaged or
missing sensor actuator.
3. Replace the tray 3 low sensor
4. Replace the engine control
board
Media Low in
Tray 2 The engine control board detected that
the tray 2 low paper sensor is actuated. 1. Add paper to tray 2
2. Check for a damaged or
missing sensor actuator.
3. Replace the tray 2 low sensor
4. Replace the engine control
board
Media Low in
Tray 1 The engine control board detected that
the Tray 1 Low Paper Sensor is
actuated.
1. Add paper to tray 1
2. Check for a damaged or
missing sensor actuator.
3. Replace the tray 1 low sensor
4. Replace the engine control
board
Load Media
in Multi-
purpose Tray
The multi-purpose tray is out of paper.
The engine control board detected that
the long multi-purpose tray paper sensor
is not actuated.
1. Load paper into the
multi-purpose tray
2. Test the multi-purpose tray
paper sensors
3. Replace the engine control
board
Load Media
in Tray 4 Tray 4 is out of paper.
The engine control board detected that
the paper empty sensor in tray 4 is
actuated.
1. Load paper into Tray 4
2. Test the paper empty sensor
3. Replace the lower feeder
circuit board
4. Replace the lower feeder
assembly
5. Replace the engine control
board
Error code
and
message
Description Corrective action
30 Phaser 780 Color Printer
Load Media
in Tray 3 Tray 3 is out of paper. The engine control
board detected that the paper empty
sensor in tray 3 is actuated.
1. Load paper into Tray 3
2. Test the tray’s paper empty
sensor
3. Replace the lower feeder
circuit board
4. Replace the lower feeder
assembly
5. Replace the engine control
board
Load Media
in Tray 2 Tray 2 is out of paper. The engine control
board detected that the paper empty
sensor in tray 2 is actuated.
1. Load paper into Tray 2
2. Test the tray’s paper empty
sensor
3. Replace the lower feeder
circuit board
4. Replace the lower feeder
assembly
5. Replace the engine control
board
Load Media
in Tray 1 Tray 1 is out of paper. The engine control
board detected that the paper empty
sensor in tray 1 is actuated.
1. Load paper into Tray 1
2. Test the tray’s paper empty
sensor
3. Replace the lower feeder
circuit board
4. Replace the engine control
board
Clear Jam At
A, B The engine control board detected that
the registration sensor was actuated
while the printer was in standby.
1. Clear jammed paper from the
printer
2. Test the feeder registration
exit sensor
3. Replace the engine control
board
Error code
and
message
Description Corrective action
Service Guide 31
Clear Jam At
A, B There is a problem near the registration
sensor. The engine control board
detected that the registration sensor did
not actuate within the specified time
after paper feed.
1. Clear jammed paper from the
printer
2. Check that the media tray
and ensure it is correctly
loaded
3. Test the pre-registration
clutch
4. Test the registration clutch
5. Test the paper feed motor
6. Check the operation of the
paper pick solenoid
7. Inspect the paper path
8. Clean the feed rollers
9. Test the registration sensor
10. Run the paper path test
11. Replace the engine control
board
Clear Jam At
C, D There is problem at the fuser exit
sensor. The engine control board
detected that the fuser exit sensor was
actuated while the printer was in
standby.
1. Clear jammed paper from the
printer
2. Test the fuser exit sensor
3. Replace the engine control
board
Clear Jam At
C, D There is problem near the fuser exit
sensor. The engine control board
detected that the fuser exit sensor did
not actuate within the specified time
after the fuser entrance sensor was
actuated.
1. Clear jammed paper from the
printer
2. Test the fuser exit sensor
3. Inspect the paper path
4. Inspect the fuser chute fan
5. Replace the fuser
6. Inspect the fuser drive gear
train. Replace if necessary
7. Replace the paper feed
motor.
8. Replace the engine control
board
Clear Jam at
EThere is problem at the media exit
sensor. The engine control board
detected that the top exit sensor was
actuated while the printer was in
standby.
1. Clear jammed paper from the
printer
2. Test the feeder media exit
sensor
3. Inspect the paper exit path
4. Replace the engine control
board
Error code
and
message
Description Corrective action
32 Phaser 780 Color Printer
Clear Jam At
EThe engine control board detected that
the media exit sensor did not actuate
within the specified time after the fuser
exit sensor actuated.
1. Clear jammed paper from the
printer
2. Inspect and clean the exit
rollers
3. Test the media exit sensor
4. Inspect and test the paper
feed gear train and paper
motor
5. Test the fuser drive gear train
and exit guide
6. Replace the engine control
board
Media Size
Mismatch The engine control board detected that
the paper that was fed into the printer
was not the same size that was detected
by the tray size sensors. The registration
sensor monitors the timing of the paper
as it runs through the printer.
1. Set paper tray guides or use
another paper tray
2. Inspect the actuators at the
rear of the paper tray.
3. Test the paper tray size
sensors
4. Replace the paper tray size
sensor board.
5. Replace the engine control
board
Install Black
Toner
Cartridge
The black toner cartridge is either not
installed or not installed correctly. The
engine control board did not receive a
signal from the cartridge sensor when
the carousel frame moved the black
developer housing into position.
1. Reseat the black toner
cartridge. Power cycle the
printer
2. Replace the black toner
cartridge
3. Replace the toner cartridge
presence sensor.
4. Replace the engine control
board.
Install Cyan
Toner
Cartridge
The cyan toner cartridge is either not
installed or not installed correctly. The
engine control board did not receive a
signal from the cartridge sensor when
the carousel frame moved the cyan
developer housing into position.
1. Reseat the cyan toner
cartridge. Power cycle the
printer
2. Replace the cyan toner
cartridge
3. Replace the toner cartridge
presence sensor.
Error code
and
message
Description Corrective action
Service Guide 33
Install
Magenta
Toner
Cartridge
The magenta toner cartridge is either
not installed or not installed correctly.
The engine control board did not receive
a signal from the cartridge sensor when
the carousel frame moved the magenta
developer housing into position.
1. Reseat the magenta toner
cartridge. Power cycle the
printer
2. Replace the magenta toner
cartridge
3. Replace the toner cartridge
presence sensor.
Install Yellow
Toner
Cartridge
The yellow toner cartridge is either not
installed or not installed correctly. The
engine control board did not receive a
signal from the cartridge sensor when
the carousel frame moved the yellow
developer housing into position.
1. Reseat the yellow toner
cartridge. Power cycle the
printer
2. Replace the yellow toner
cartridge
3. Replace the toner cartridge
presence sensor.
4. Replace the engine control
board.
Install Waste
Cartridge The waste toner box is not installed. The
engine control board detected that the
waste toner box sensor was deactuated.
1. Reseat waste cartridge
2. Power cycle the printer
3. Test the waste toner sensor
4. Check the sensor wiring
5. Replace the sensor
6. Replace the engine control
board
Install
Tray 1 The engine control board did not detect
a paper tray installed in Tray 1 slot. 1. Reseat the tray into the main
feeder slot
2. Inspect the tray’s switch
actuators for damage
3. Replace the paper size
sensor assembly
4. Replace the engine control
board
Install
Tray 2 The engine control board did not detect
a Paper Tray installed in Tray 2 slot. 1. Reseat the tray into the
second feeder slot
2. Inspect the tray’s switch
actuators for damage
3. Replace the paper size
sensor assembly
4. Inspect the lower
feeder-to-printer connections
at the back of the printer.
5. Replace the engine control
board
Error code
and
message
Description Corrective action
34 Phaser 780 Color Printer
Install
Tray 3 The engine control board did not detect
a Paper Tray installed in Tray 3 slot. 1. Reseat the tray into the third
feeder slot
2. Inspect the tray’s switch
actuators for damage
3. Inspect the lower
feeder-to-printer connections
Replace the paper size
sensor assembly
4. Replace the engine control
board
Install
Tray 4 The engine control board did not detect
a Paper Tray installed in Tray 4 slot. 1. Reseat the tray into the fourth
feeder slot
2. Inspect the tray’s switch
actuators for damage
3. Inspect the lower
feeder-to-printer connections
Replace the paper size
sensor assembly
4. Replace the engine control
board
Install
Imaging Unit The imaging unit is either not installed or
not installed correctly. The engine
control board did receive a signal from
the customer replaceable unit memory.
1. Reseat the imaging unit
2. Inspect the CRUM connector
for damage or contamination.
Clean or replace if necessary
3. Replace the imaging unit
4. Replace the engine control
board
Install Fuser
Roll
Cartridge
The engine control board detected that
the fuser oil roll assembly circuit is open. 1. Reseat the fuser oil roll
2. Inspect the fuser roll contacts
and connectors. Ensure they
are clean and seated
correctly
3. Replace the fuser roll
4. Replace the engine control
board
Error code
and
message
Description Corrective action
Service Guide 35
Second Bias
Transfer
Roller Error
The engine control board detected that
the measured current value across
second bias transfer roller was not within
specifications.
1. Power cycle the printer
2. Replace the high voltage
power supply
3. Replace the engine control
board
4. Replace the second bias
transfer roller
5. Replace the accumulator belt
assembly
Replace
Fuser The fuser has reached end of life. The
engine control board detected that the
fuser has processed 250,000 images or
the toner dispense motor has
accumulated more than 70,564 x 100ms
of running time.
1. Use diagnostics to verify the
print count
2. Replace the fuser
3. Replace the engine control
board
Printer
Maintenance
Required -
Replace the
Accumulator
Belt Cleaner
The accumulator belt cleaner is nearing
end of life. The engine control board
detected that the accumulator belt
cleaner processed 100,000 sheets of
paper.
1. Use diagnostics to verify the
print count
2. Replace the accumulator belt
cleaner
3. Replace the engine control
board
Printer
Maintenance
Required
The accumulator cleaner belt has
reached end of life. The engine control
board detected that the accumulator belt
cleaner has processed over 102,000
belt clean cycles.
1. Use diagnostics to verify the
print count
2. Replace the accumulator belt
cleaner
3. Replace the engine control
board
Printer
Maintenance
Required -
Replace the
Second Bias
Transfer
Roller
The second bias transfer roller is
nearing the end of its life. The engine
control board detected that the second
bias transfer roller has processed
100,000 sheets of paper.
1. Use diagnostics to verify the
print count
2. Replace the second bias
transfer roller
3. Replace the engine control
board
Error code
and
message
Description Corrective action
36 Phaser 780 Color Printer
Printer
Maintenance
Required
The second bias transfer roller has
reached end of life. The engine control
board detected that second bias transfer
roller has completed over 100,000
images.
1. Use diagnostics to verify the
print count
2. Replace the second bias
transfer roller
3. Replace the engine control
board
Printer
Maintenance
Required
Soon -
Imaging Unit
Life Almost
Over
The imaging unit has reached end of life.
The engine control board detected that
the drum inside the imaging unit has
exceeded 90,000 revolutions.
1. Replace the imaging unit
2. Replace the engine control
board
Fuser Life
Almost Over The fuser is nearing end of life. The
engine control board detected that the
fuser processed 237,500 images or the
toner dispense motor has accumulated
more than 67,036 x 100ms of running
time.
1. Replace the fuser
2. Replace the engine control
board
Replace the
imaging unit The imaging unit has reached end of life.
The engine control board detected that
the imaging unit has printed 110,000
images.
1. Replace the imaging unit
2. Check the CRUM connector
for damage or contamination.
Clean or replace if necessary
3. Replace the engine control
board
Close Lower
Tray
Assembly
Cover
The engine control board detected that
the lower feeder cover interlock switch is
deactuated.
1. Close the feeder cover
2. Inspect the interlock switch.
Replace if necessary
3. Replace the feeder control
board
4. Inspect the lower
feeder-to-printer connections
at the rear of the printer
5. Replace the feeder
6. Replace the engine control
board
Error code
and
message
Description Corrective action
Service Guide 37
Close Left
Fuser Unit The engine control board detected that
the fuser interlock circuit is open. 1. Reseat the fuser
2. Inspect the fuser mating
connectors for proper fit
3. Replace the engine control
board
Close Exit
Cover The engine control board detected that
the exit door switch is deactuated. 1. Close the exit cover
2. Replace the exit chute switch
3. Replace the upper exit
assembly
4. Replace the engine control
board
Close Right
Feed Unit The engine control board detected that
the paper feeder Interlock circuit is
open.
1. Close the paper feeder
assembly
2. Inspect the mating
connectors of the paper
feeder
3. Replace the paper feed
harness
4. Replace the paper feeder
5. Replace the engine control
board
Close Front
Cover The engine control board detected that
the front cover interlock switch is
deactuated.
1. Close the front cover
2. Inspect the cover’s switch
actuators. Replace the cover
if damaged
3. Test for +24 VDC at Pins
P32-8 and 3. You should
measure 24 VDC at pin 3
through the right and left
cover interlock switches back
to pin 8.
4. Test for 5 VDC between
P33-1 and frame ground It
should switch between 5
and 0 VDC when the front
cover is opened and closed.
If not replace the left front
cover switch
5. Replace the low voltage
power supply
Error code
and
message
Description Corrective action
Empty the
Top Output
Tray
The engine control board detected that
the full stack sensor is actuated for more
than 12 seconds.
1. Remove the prints from
output tray
2. Inspect for damage the
output tray full sensor.
Replace if necessary
3. Replace the engine control
board
Error code
and
message
Description Corrective action
Service Guide
39
Troubleshooting
System power-up sequence
1.
The main power switch is turned on. (Or the front cover is opened and
then closed or diagnostics are exited.)
2.
The print engine reads the Customer Replaceable Unit Memory (CRUM).
3.
The print engine determines that all the CRUs are in place, except for the
toner cartridges.
4.
The print engine checks its sensors for any static jam errors.
5.
The print engine reads all life counters in NVRAM.
6.
The print engine applies voltage to the fuser to bring it up to standby
temperature.
7.
The process motor energizes and then a 1/4 second later, the paper feed
motor is energized.
8.
The print engine powers on the carousel motor and checks the presence of
the four toner developer assemblies.
9.
The print engine verifies proper operation of the image process
components. The auto-density calibration sensor checks the density
levels.
10.
The print engine initiates a cleaning cycle of the accumulator belt.
11.
The process motor is de-energized.
12.
The print engine updates the NVRAM
13.
The print engine updates the CRU memory.
14.
The paper feed motor is de-energized.
The print engine is initialized.
40
Phaser 780 Color Printer
Print engine troubleshooting
Printer will not power up
When you switch on the printer, the control panel does not light, the fans do not
rotate, the carousel motor does not cycle, and the printer does not go into warm-
up.
1.
110VAC IN Check
a.
Inspect the AC Power Cord. Is the AC Power Cord plugged into the
printer, and is the other end plugged into an AC wall outlet?
b.
Check the voltage at the AC wall outlet. Is there approximately
110 VAC (or 220 VAC if the printer is the 220 VAC model) at the AC
wall outlet?
c.
Remove the rear cover.
d.
Measure the voltage between the two low voltage power supply
solder points located next to the AC power jack. Is there 110 VAC
between the two points?
2.
Low voltage power supply check
a.
Measure the voltage between P33-3 on the low voltage power
supply and frame ground. Is there +5 VDC between P33-3 and
frame ground. If not, replace the low voltage power supply.
a.
Check for +24VDC between P32-3 on the low voltage power supply
and frame ground. Replace the low voltage power supply. Check
for +24VDC between P32-8 and frame ground. If voltage is at pin 3
but not at pin 8, check the front cover, fuser and paper feeder
interlock switches. Is there +24VDC between P32-11 and frame
ground? If not, replace the power supply. Check for a short in the
24 volt components (particularly on the paper feed motor circuit
board).
3.
Low voltage power supply loading check
a.
Disconnect P32 and P33 from the low voltage power supply.
b.
Measure the voltage between P33-3 on the low voltage power
supply and frame ground, and between P32-11 on the low voltage
power supply and frame ground. Is there +5 VDC between P33-3
and frame ground, and is there +24 VDC between P32-11 and frame
ground? If not, replace the low voltage power supply.
4.
Engine control board loading check
a.
Reconnect P32 and P33 to the low voltage power supply.
b.
Refer to “Wiring Diagrams” on page 185 and one by one disconnect
components that are connected to the engine control board.
Service Guide
41
c.
Measure the voltage between P33-3 on the low voltage power
supply and frame ground, and between P32-11 on the low voltage
power supply and frame ground. Do you eventually measure
+5 VDC between P33-3 and frame ground, and +24 VDC between
P32-11 and frame ground? If yes, replace the component that is
loading down the power supply. If no, replace the engine control
board.
5.
Image processor check
a.
Turn off the printer.
b.
Remove the image processor board.
c.
Turn on the printer. Does the printer go into warm-up? If yes,
replace the image processor board. If not, replace the engine
control board.
Erratic printer operation
The printer has a variety of intermittent problems, but generally does not
complete a print cycle. The problems are generally not identified by
displayed error codes.
1.
Does the printer frequently fail to enter printer warm-up or is the front
panel frequently inoperative? If yes, follow the earlier procedure
“Printer will not power up” on page 40.
2.
Run print engine test prints, which print independently of the image
processor, to determine if the image processor is the problem. Refer to
“Making a print engine only test print” on page 42.
3.
Low voltage power supply loading check
a.
Run 50 test prints from the image processor’s built in test prints.
b.
Measure the voltage between P33-3 on the low voltage power
supply and frame ground, and between P32-11 on the low voltage
power supply and frame ground. Is there a steady +5 VDC
between P33-3 and frame ground, and is there at steady +24V DC
between P32-11 and frame ground? If no, Replace the low voltage
power supply.
4.
If test prints from the image processor print reliably, reload the host’s
printer driver software or the host application software. Does the printer
still exhibit erratic operation?
5.
Try printer from another application. Ensure that the host computer
prints reliable to a different printer. Also try printing from another
computer to the Phaser 780.
6.
Replace the interface cable connecting the host to the printer.
7.
Replace the engine control board.
8.
Replace the image processor board.
42
Phaser 780 Color Printer
Making a print engine only test print
Using the image processor.
1.
Turn off the printer.
2.
Remove the right side panel to access the image processor board.
3.
Locate switch 4 of S930 on the image processor board. Closing switch 4
bypasses the image processor board and places the engine control board
into test mode upon power up.
4.
Turn on the printer.
5.
The printer generates process black (all four colors layered) grid patterns.
The printer feeds from the first tray that has paper - in this order; Tray 1,
Tray 2, Tray 3, Tray 4, and multi-purpose feeder. The printer sends the test
prints to the face down output tray. The printer generates test prints until
you stop the test.
6.
Switch off printer main power to stop generating test prints.
7.
Move the S930 switch 4 to the off (open) position.
Using the print engine board.
To generate a test print without the image processor
installed.
1.
Turn off the printer.
2.
Remove the image processor so you can access the engine control board.
3.
Locate JP3, just below the ROM chip on the engine control board.
4.
Move the switch to the ON position.
5.
Turn on the printer.
6.
The printer generates test prints just as it does in the previous procedure.
7.
Switch off printer main power to stop generating test prints.
8.
Move the switch to the 1 position.
Service Guide
43
Printing and print quality problems
Initial checks and actions
1.
Does the printer display an error code? If so go to “Error Codes and
Messages” on page 19.
2.
Is the AC power provided at the wall outlet within recommended
specifications?
3.
Is the printer properly gounded through the AC wall outlet?
4.
Is the printer located in an area where the temperature and humidity are
stable and within specifications?
5.
Is the printer located in an area free of dust?
6.
Is the printer located away from water outlets, steamers, electric heaters,
volatile gases, open flames and strong radio frequency sources?
7.
Is the printer shielded from the direct rays of the sun?
8.
Does the printer have adequate clearances on all sides for proper
ventilations?
9.
Is the printer installed on a level, stable surface?
10.
Is the correct paper stock being used in the printer?
11.
Is the customer using the printer correctly as explained in the user
documentation?
12.
Have the consumables been replaced correctly at the required intervals?
13.
Is the problem a failure or the result of improper use, incorrect media
type/weight, excessive use or a limitation of the duty cycle?
44
Phaser 780 Color Printer
Light (undertone) prints
The overall image density is too light.
The printer displays no error code.
1.
Inspect the paper that is
loaded in the paper tray.
Check that the paper is not
wrinkled or moist. Also
ensure it is the correct weight.
Card stock must be feed from
the multi-purpose tray.
Recycled paper and paper
less than 24 lbs may produce
less than optimum quality.
2.
Clean and inspect the auto-
density calibration sensor. Test
the sensor using the printer’s
built-in diagnostics. If an error
11, 12, or 13 is detected, replace
the auto-density calibration
sensor.
3.
Print Service Test Print 1 on B-
size paper and open the front cover just as the sheet of paper starts to exit
the fuser. Inspect the image on the sheet of paper
before
it reaches the fuser
rollers. Is the image density normal before it reached the fuser rollers? If no,
go to Step 4. If yes, go to Step 7.
4.
Remove the imaging unit.
5.
Inspect the test print image on the accumulator belt. Does the image
appear completely transferred to the accumulator belt? If yes, replace the
second bias transfer roller. If not, replace the accumulator belt.
6.
Print Service Test Print 1 and inspect the image on the sheet of paper. Is
the image density now normal? If not, replace the high voltage power
supply.
7.
Print Service Test Print 1 again and inspect the image on the sheet of paper
after
it exits the fuser rolls. Is the image light when it exits the fuser? If
yes, replace the oil roll cartridge.
8.
Generate a test print.
9.
Inspect the image on the sheet. Is the image density now normal as it exits
the fuser? If not, replace the fuser.
3041-37
Service Guide
45
Blank prints
The entire image area is blank. The
printer displays no error code.
1.
Generate a test print. Is the
test print blank? If no, reload
the printer driver software or
replace the image processor
board.
2.
Remove the imaging unit.
3.
Inspect the empty imaging
unit cavity for a sheet of paper
that could be blocking the
laser window.
4.
Generate a test print and open
the front cover just before the
sheet of paper enters the fuser.
5.
Remove the imaging unit.
6.
Inspect the image on the
drum. Is there an image visible on
the drum? If not, make an engine-only test print. If a test print is printed,
replace the image processor board. If not, replace the imaging unit.
7.
Generate a test print. Is the test print blank? If yes, replace the high
voltage power supply.
8.
Inspect the image on the surface of the accumulator belt? Is there an
image visible on the surface of the accumulator belt? If yes, replace the
second bias transfer roller. If not replace the accumulator belt.
9.
Replace the engine control board.
46
Phaser 780 Color Printer
Monochrome prints
No color is present in a color print, only the black layer is printed. The printer
displays no error code. In some cases, depending on the nature of the failure,
only a portion of the print may be monochrome while the remainder of the print
is in color.
1.
Check the accumulator belt cleaner for correct installation. The cleaning
blade may be in constant contact with the accumulator belt, scraping off
each layer of color toner soon after it is transferred.
2.
Inspect the cleaner cam guides and holders located at the front and back of
the fuser assembly. Are the cleaner cam holders seated properly? If not,
reseat them as necessary.
3.
Manually actuate the cleaner cam solenoid and rotate the fuser input gear
to cycle the cleaner cam through its cycle of operation. Does the cleaner
cam operate the cleaner cam guides properly? If not, replace the fuser
assembly.
4.
Replace the accumulator belt cleaner.
3041-38
Service Guide
47
Black prints
The entire image area is black. The
printer displays no error code.
1.
Power cycle the printer, if an
error 10 is detected replace
the laser scanner unit.
2.
Replace the engine control
board.
3.
Print Service Test Print 1.
4. Is the test print completely
black? If no, reload the
printer driver software or
replace the image processor
board.
5. Generate a test print and open
the front door just before the
sheet of paper enters the fuser.
6. Remove the imaging unit.
7. Inspect the image on the
drum. Is there a developed test print image visible on the drum? If no,
replace the imaging unit.
8. Generate a test print. Is the test print black? Replace the high voltage
power supply.
One color is faded
Toner cartridge is depleted or the toner developer is defective.
1. Replace the defective toner cartridge.
2. Replace the toner developer of the defective color.
3041-39
48 Phaser 780 Color Printer
Missing band in direction of paper travel
There are areas of the image that are
extremely light or are missing
entirely. These missing areas form
wide bands that run along the page
from leading edge to trailing edge in
the direction of paper travel (B-size
print shown). The printer displays no
error code.
Note A-size prints are processed
through the printer with the
short edge of the print parallel to
the direction of the paper path
making print artifacts parallel to
the short edge of the print.
In B-size prints are processed
through the printer with the long
edge of the print parallel to the
paper path making artifacts
parallel to the long axis of the
print.
1. Is the paper wrinkled, dimpled, or show any signs of having a high
moisture content? Load fresh, dry paper.
2. Print Service Print 1. Do the bands appear in all four colors, If yes, go to
Step 3, If not, go to Step 7.
3. Remove the imaging unit. Inspect the empty cavity for a scrap of paper or
a toner blotch that could be blocking the laser window.
4. Generate a test print and open the front cover just before the sheet of
paper enters the fuser.
5. Remove the imaging unit.
6. Inspect the image on the drum. Is there a normal test print image, without
any vertical band deletions, visible on the drum? If yes, go to Step 9. If no,
go to Step 7.
7. Remove the top cover.
8. Turn the carousel frame and inspect the magnetic rollers of each of the
four developer assemblies. Do the magnetic rollers of each developer
assembly appear smooth, evenly formed, without any low spots, and
without obvious contamination? If yes, replace the imaging unit. If not,
replace the faulty developer assembly.
9. Inspect the image on the surface of the accumulator belt? Is there a
normal test image, without any band deletions, visible on the surface of
the accumulator belt? If no, replace the accumulator belt.
10. Generate a test print and open the front cover just before the sheet of
paper enters the fuser.
3041-40
Leading Edge
Service Guide 49
11. Inspect the image on the paper just before the paper enter the fuser. Is
there a normal test print image, without any band deletions, visible on the
sheet of paper? If not, replace the second bias transfer roller.
12. Generate a test print and slide the fuser assembly out of the printer just as
the sheet of paper exits the fuser.
13. Inspect the image on the sheet of paper just after the paper exits the fuser.
Is there a normal test print image on the sheet of paper before entering the
fuser but the image has visible band deletions after it exits the fuser? If
yes, replace the oil roll cartridge.
14. Generate a test print.
15. Inspect the image on the sheet. Is the image now normal, without band
deletions as it exits the fuser? If no, replace the fuser.
Missing bands in parallel to the leading edge
There are areas of the image that are
extremely light or are missing
entirely. These missing areas form
wide bands that run across the page
parallel with the leading edge of the
print, perpendicular with the
direction of paper travel (B-size print
shown). The printer displays no error
code.
Note A-size prints are processed
through the printer with the short
edge of the print parallel to the
direction of the paper path making
print artifacts parallel to the long
edge of the print.
In B-size prints are processed
through the printer with the long
edge of the print parallel to the
paper path making artifacts
parallel to the short axis of the
print.
1. Inspect the paper that is loaded in the paper tray. Is the paper wrinkled,
dimpled, or show any signs of having a high moisture content?
2. Print Service Print 1. Do the bands appear in all four colors, If yes, go to
Step 3, If not, go to Step 11.
3. Generate a test print and open the front cover just before the sheet of
paper enters the fuser.
4. Remove the imaging unit.
3041-41
L
ea
di
ng
Ed
ge
50 Phaser 780 Color Printer
5. Inspect the image on the drum. Is there a normal test print image, without
any band deletions, visible on the drum? If yes, go to Step 6. If not,
replace the imaging unit.
6. Inspect the image on the surface of the accumulator belt? Is there a
normal test print image, without any horizontal band deletions, visible on
the surface of the accumulator belt? If no, replace the accumulator belt.
7. Inspect the image on the sheet of paper just before the paper enter the
fuser. Is there a normal test print image, without any band deletions,
visible on the sheet of paper? If not, replace the second bias transfer roller.
8. Generate a test print and open the front cover just as the sheet of paper
exits the fuser.
9. Inspect the image on the sheet of paper just after the paper exits the fuser.
Is there a normal test print image on the sheet of paper before entering the
fuser but the image has visible horizontal band deletions after it exits the
fuser? If yes, replace the fuser roll cartridge.
10. Make another test print. If the problem still occurs, replace the fuser.
11. Remove the top cover.
12. Turn the carousel frame and inspect the magnet roller of each of the four
developer assemblies. Do the magnet rollers of each developer assembly
appear smooth, evenly formed, without any low spots, and without
obvious contamination? If not, replace the defective developer assembly.
13. Replace the high voltage power supply.
14. Replace each of the four developer assemblies, one at a time.
Service Guide 51
Streaks in direction of paper travel
There are dark lines running along
the page in the direction of paper
travel from the leading edge to the
trailing edge (B-size print shown).
The printer displays no error code.
Note A-size prints are processed
through the printer with the
short edge of the print parallel to
the direction of the paper path
making horizontal print artifacts
parallel to the shot edge of the
print.
In B-size prints are processed
through the printer with the long
edge of the print parallel to the
paper path making horizontal
artifacts parallel to the long axis
of the print.
1. Inspect the paper path, between feed and exit, for contamination or
obstructions. Is the paper path free of contamination or obstructions?
2. Check for dirty fuser guide rollers. Also look for toner contamination on
the fuser’s temperature sensor.
3. Print Service Print 4 and open the front cover just before the sheet of
paper enters the fuser.
4. Remove the imaging unit.
5. Inspect the image on the drum. Is there a normal test print image,
without any streaks, visible on the drum? If yes, go to Step 6. If not,
replace the imaging unit.
6. Inspect the image on the surface of the accumulator belt. Is there a
normal test print image, without any streaks, visible on the surface of the
accumulator belt? If no, replace the accumulator belt. If yes, inspect the
accumulator belt cleaner’s plastic shield for damage; replace the belt
cleaner, if necessary. Replace the second bias transfer roller.
7. Generate a test print and open the front cover just as the sheet of paper
exits the fuser.
8. Inspect the image on the sheet of paper just after the paper exits the fuser.
Is there a normal test print image on the sheet of paper before entering the
fuser but the image has visible streaks after it exits the fuser? If yes,
replace the fuser roll cartridge. If streaks continue to occur, replace the
fuser.
9. Remove the top cover.
3041-42
Leading Edge
52 Phaser 780 Color Printer
10. Turn the carousel frame and inspect the magnet roller of each of the four
developer assemblies. Do the magnet rollers of each developer assembly
appear smooth, evenly formed, without any low spots, and without
obvious contamination? If not, replace the defective developer assembly.
11. Replace the high voltage power supply.
Streaks parallel with the leading edge
There are dark lines running parallel
with the leading edge of the print,
perpendicular to direction of paper
travel (B-size print shown). The
printer displays no error code.
Note A-size prints are processed
through the printer with the
short edge of the print parallel to
the direction of the paper path
making print artifacts parallel to
the long edge of the print.
In B-size prints are processed
through the printer with the long
edge of the print parallel to the
paper path making artifacts
parallel to the short axis of the
print.
1.Print Service Print 1. Do the
streaks appear in all colors? If not, go to Step 8.
2. Print Service Print 4 and open the front cover just before the sheet of paper
enters the fuser.
3. Remove the imaging unit.
4. Inspect the image on the drum. Is there a normal test print image, without
any horizontal streaks, visible on the drum? If yes, go to Step 4. If not,
replace the imaging unit.
5. Inspect the image on the surface of the accumulator belt. Is there a normal
test print image, without any streaks, visible on the surface of the
accumulator belt? If no, replace the accumulator belt. If yes, inspect the
accumulator belt cleaner’s plastic shield for damage; replace the belt
cleaner, if necessary. Replace the second bias transfer roller.
6. Print Service Print 4 and slide the fuser out of the printer just as the sheet
of paper exits the fuser.
7. Inspect the image on the sheet of paper just after the paper exits the fuser.
Is there a normal test print image on the sheet of paper before entering the
fuser but the image has visible streaks after it exits the fuser? If yes,
replace the fuser roll cartridge. If streaks continue to occur, replace the
fuser.
3041-43
Leading Edge
Service Guide 53
8. Remove the top cover. Turn the carousel frame and inspect the magnet
roller of each of the four developer assemblies. Do the magnet rollers of
each developer assembly appear smooth, evenly formed, without any low
spots, and without obvious contamination? If not, replace the defective
developer assembly.
9. Replace the high voltage power supply.
Banding
There are three kinds of banding:
1. If a dark band appears every 364 mm from the leading edge of a B-size
print or occasionally on A-size print, reseat the imaging unit and print
again. If the problem persists perform the procedure “Adjusting for
impulse banding” on page 74.
2. If a dark band appears at a 1.3 to 1.7 mm pitch throughout solid fills,
replace the process drive assembly.
3. Dark bands appearing randomly in solid fills at pitches such as 44 mm, 88
mm or 104 mm. Replace the process drive assembly.
Edge of print is wrinkled with an area of ragged discoloration.
The fuser roll cartridge is out of position.
1. Reseat the fuser roll cartridge
3041-44
3041-45
54 Phaser 780 Color Printer
Random missing spots
There are small areas of the image
that are extremely light or are missing
entirely. These missing areas form
spots that are localized to small areas
of the page. The printer displays no
error code. A small number of
occasional missing spots is normal.
1. Inspect the paper that is
loaded in the paper tray.
Ensure the paper is not
wrinkled nor moist?
2. Random white spots with a
small grit-like center, usually
occurring in cyan and
magenta, can be caused by
compacted toner. Print
Service Print 5, 6, 7, or 8,
which ever color applies, to
purge out the toner of the
affective color.
3. Replace the affected toner cartridge. If problem continues replace that
color’s developer.
4. Generate a test print and open the front cover just before the sheet of
paper enters the fuser.
5. Remove the imaging unit. Inspect the image on the drum. Is there a
normal test print image, without any spot deletions, visible on the drum?
If yes, go to Step 6. If not, replace the imaging unit.
6. Inspect the image on the surface of the accumulator belt? Is there a
normal test print image, without any spot deletions, visible on the surface
of the accumulator belt? If no, replace the accumulator belt.
7. Inspect the image on the sheet of paper just before the paper enter the
fuser. Is there a normal test print image, without any spot deletions? If
no, replace the second bias transfer roller.
8. Print Service Print 2 and open the front cover just as the sheet of paper
exits the fuser.
9. Inspect the image on the sheet of paper just after the paper exits the Fuser.
Is there a normal test print image on the sheet of paper before entering the
fuser but the image has visible spot deletions after it exits the fuser? If yes,
replace the fuser roll cartridge.
10. Make another test print. If the problem still occurs, replace the fuser.
11. Make a test print and the remove the top cover.
12. Turn the carousel frame and inspect the magnet roller of each of the four
developer assemblies. Do the magnet rollers of each developer assembly
appear smooth, evenly formed, without any low spots, and without
obvious contamination? If not, replace the defective developer assembly.
3041-46
Service Guide 55
Random spotting
There are spots of toner randomly scattered across the page. The printer displays
no error code.
1. Slide the paper feeder out of the printer and inspect the top of the
registration chute assembly. Is the top of the registration chute assembly
free of toner and foreign debris? If not, remove and inspect the waste
toner cartridge. Make sure the cartridge is not damaged or leaking.
2. If the spots appear in a single color, run 20 prints to consume the clumped
toner. If necessary, replace the toner cartridge.
3. Remove and inspect the imaging unit. Is the exterior of the imaging unit
clean and with no obvious toner leakage? If not, remove and inspect the
waste toner cartridge. Make sure the cartridge is not damaged or leaking.
4. Remove the top cover.
5. Turn the carousel frame and inspect the four developer assemblies. Does
each developer assembly appear clean, without any obvious toner on the
exterior of the assembly or falling from the magnetic brush? Clean the
dirty developer assembly. If the problem reoccurs, replace the faulty
developer assembly.
6. Inspect the fuser. Is the fuser free of toner? Clean the fuser, if necessary
by processing 10 sheets of B-size paper though it.
7. Remove and inspect the accumulator belt cleaner assembly. Is the
accumulator belt cleaner assembly clean and with no obvious toner
leakage? If not clean or replace the accumulator belt cleaner assembly, if
necessary.
8. With the accumulator belt cleaner assembly removed, inspect the
accumulator belt cleaner end of the auger. Is the auger clogged? Clean
the printer interior.
9. Remove the rear cover.
10. With the accumulator belt cleaner assembly removed, watch the auger
drive gear as you manually rotate the paper feed motor. Does the fuser
drive assembly rotate the auger drive gear? If not, replace the fuser drive
assembly.
11. As you manually rotate the paper feed motor place your finger inside the
auger opening and feel the movement of the auger spring. Does the
auger spring rotate when you manually rotate the paper feed motor? If
not, replace the auger assembly.
12. Replace the imaging unit.
3041-47
56 Phaser 780 Color Printer
Repetitive mark appears on each print
An identical mark or image appears on each, or every other, printed image.
1. If spots repeat every 264 mm (10.4 in.) or appear to move in the direction
of paper travel from print to print, replace the imaging unit. If a defect
repeats in exactly the same place on successive prints, replace the
accumulator belt assembly.
2. If a problem repeats every 117 mm (4.5 in.), replace the fuser. If a problem
repeats every 107 mm (4.25 in.), replace the fuser roll cartridge.
3. An 88 mm (3.5 in.) smear may occur on the first print made after a new
imaging unit is installed due to the misalignment of the imaging unit’s gear
teeth with its drive gear. Once printing starts, the teeth will mesh properly
and the problem will disappear.
4. A defect every 58 mm (2.5 in.) or less is related to the feed or exit rollers.
Residual image or ghosting
There are faint, ghostly images
appearing on the page. The images
may be either from a previous page or
from the page currently being printed.
The printer displays no error code.
1. Was the customer printing
numerous copies of the same
image? Avoid printing numerous
copies of the same image.
2. Generate a test print and open the
front cover just before the sheet of
paper enters the fuser.
3. Remove the imaging unit.
4. Inspect the image on the drum. Is
there a normal image, without
ghosts, visible on the drum? If no,
replace the erase lamp. (A failing
high-voltage power supply can
also cause ghosting.)
5. If the customer is consistently printing 250 B-size (500 A-size) prints a day,
recommend the Hi-Duty Fuser Roll Cartridge. If fuser damage is
excessive, replace fuser and install Hi-duty Fuser Roll Cartridge.
3041-48
3041-49
Service Guide 57
6. Replace the imaging unit. Excessive duplexing of the same image can
cause ghost images on the imaging unit drum from fuser oil
contamination.
7. Inspect the image on the surface of the accumulator belt? Is there a
normal test print image, without ghosts, visible on the surface of the
accumulator belt? If a ghost is present, visually inspect the operation of
the cleaner cam solenoid and the cleaner cam guides located on the fuser
assembly. If no ghost is present, replace the accumulator belt cleaner
assembly.
8. Generate a test print and open the front cover just as the sheet of paper
exits the fuser.
9. Inspect the image on the sheet of paper just after the paper exits the Fuser.
Is there a normal test print image on the sheet of paper before entering the
fuser but the image has ghost images after it exits the fuser? If yes,
replace the fuser roll cartridge.
10. If ghosting continues, replace the fuser.
Background contamination
There is toner contamination on all or
most of the page. The contamination
appears as a very light gray dusting.
The printer displays no error code.
1. Print Service Print 2 and open
the front cover just before the
sheet of paper enters the fuser.
2. Remove the imaging unit.
Inspect the image on the drum.
Is there a normal test print
image, without background
contamination, visible on the
drum? If not, replace the high
voltage power supply.
3. Inspect the image on the
surface of the accumulator
belt? Is there a normal test
print image, without
background, visible on the
surface of the accumulator
belt? If not replace the
accumulator belt assembly.
4. Print service Print 2 and open the front cover just as the sheet of paper
exits the fuser.
5. Inspect the image on the sheet of paper just after the paper exits the fuser.
Is there a normal test print image on the sheet of paper before entering the
fuser but the image has background after it exits the fuser? If so, replace
the fuser roll cartridge.
6. If background contamination continues to occur after 20 prints, replace
the fuser.
3041-50
58 Phaser 780 Color Printer
Unfused image or image easily rubs off of page
The toner image is not completely
fused to the paper. The image
easily rubs off. The printer displays
no error code.
1. Is the image density very
light? If light, but not blank,
go to the earlier topic “Light
(undertone) prints” on
page 44.
2. Check the media weight and
settings at the printer driver.
3. Check the defaults set at the
front panel for media size
and type.
4. Is the printed image fused to
the paper. If not, replace the
fuser.
5. Replace the low voltage
power supply
6. Replace the engine control board
Toner on back of print
There is toner on the back of the
printed sheet of paper.
1. Clean the printer interior
2. Inspect the paper that is loaded
in the paper trays. Is the paper
clean and free of toner?
3. Generate a test print and open
the front cover just before the
sheet of paper reaches the
second bias transfer roller, about
one second after the registration
solenoid actuates.
4. Slide the paper feeder out of the
printer and inspect the back of
the sheet of paper. Is the back of
the sheet of paper clean and free
of toner? If not clean the paper
feeder and its metal and rubber
registration rollers.
5. Generate a test print and open the front cover just before the sheet of
paper reaches the fuser.
3041-51
3041-52
Service Guide 59
6. Open the front cover and inspect the back of the sheet of paper. Is the
back of the sheet clean and free of toner? If not, replace the second bias
transfer roller and if necessary also replace the accumulator belt cleaner
assembly.
7. Generate a test print and open the front cover just as the sheet of paper
exits the fuser.
8. Slide the fuser out of the printer and inspect the back of the sheet of
paper. Is the back of the sheet of paper clean and free of toner when it
exits the fuser? If not, clean the fuser rollers, by processing 10 sheets of B-
size paper through the printer, or replace the fuser.
9. Generate a test print and open the upper exit cover just as the sheet of
paper reaches exit roller.
10. Inspect the back of the sheet of paper. Is the back of the sheet of paper
clean and free of toner as it nears the exit roller? If not, clean or replace
the upper exit assembly.
Print is mottled
The printed image has a mottled
appearance.
1. Ensure good quality laser paper is
being used.
2. Check the media settings at the
printer driver and at the front
panel default settings for media
size and type.
3. Does mottling occur on only one
color? If yes, remove the top cover
and inspect the magnetic rollers of
the affected color’s developer
assembly. Ensure there is no
buildup. Replace the developer if
necessary.
4. Print Service Print 2 and open the
front cover just before the sheet of
media exits the fuser. Remove the
imaging unit and inspect the image
on the drum. Is there a normal
image without mottling. If not
replace the imaging unit.
5. Inspect the image on the accumulator belt. Is there a normal image without
mottling on the belt? If not, replace the accumulator belt assembly.
6. Print a test print and open the front cover just before the sheet of media
reaches the fuser. Is there a normal image on the print without mottling. If
not replace the second bias transfer roller.
7. If the image on a print is normal before it passes through the fuser but
mottled afterwards, replace the fuser roll cartridge. If the problem
persists, replace the fuser.
3041-53
60 Phaser 780 Color Printer
Image mis-registered on paper
The image area is not centered on the
page or the image is bleeding off of
the page. The printer displays no error
code.
1. Is the correct weight paper
correctly loaded in the tray(s)
or multi-purpose tray? Ensure
the paper guides are correctly
set.
2. Clean or replace the pick rollers.
3. Print Service Print 3 and slide
the paper feeder out about 10
seconds after pressing Print.
The paper should be evenly
pre-registered 6 mm (1/4 in.)
from the mylar registration
guide. If correctly registered,
test the registration clutch.
Clean the registration rollers. If
not, test the pick solenoid of the
tray being used. Replace if
needed.
4. Replace the paper feeder.
5. Replace the engine control board.
Color layer not correctly registered
The four color images are not
registered correctly and do not form a
clean, four color image on the page.
The printer displays no error code.
1. Ensure the shipping blocks
are removed from the paper
feeder.
2. Test the accumulator belt home
sensor. Replace it if necessary.
3. Replace the engine control
board.
4. Replace the image processor.
5. Replace the accumulator belt
assembly.
3041-54
3041-55
Service Guide 61
Color representation not correct
The color of the printed image is
completely different than the
computer image. The printer
displays no error code.
1. Ensure driver settings are
correct. Reload the printer
driver software.
2. Clean and inspect the auto-
density calibration sensor.
Test the sensor using the
printer’s built-in diagnostics.
3. Replace the image processor.
4. Replace the engine control
board.
5. Replace the carousel home
sensor.
Oil stain or gloss variation on print
Variations in glossiness in solid fills may occur near the oil roll cartridge end of
life or with printers running excessively high daily print volumes. If the
customer is consistently running a high volume of prints per day, they should
user the high-capacity fuser roll cartridge.
1. An oil stain may occur on first print after the printer has been idle for an
extended period. If the problem persists on sucessive prints, replace the
oil roll cartridge. Look for excessive oil around the fuser.
2. Check the media in the tray. Try new media.
3. Glossiness variations in solid fills may occur near the oil roll cartridge end
of life or with printers running high daily print volumes. On coated
paper, a variation in glossiness may occur 118 mm from the print’s
leading edge.
3041-56
3041-57
62 Phaser 780 Color Printer
Random spotting
There are spots of toner randomly
scattered across the page.
1. Slide the paper feeder out of
the printer and inspect the
top of the registration chute
assembly. Is the top of the
registration chute assembly
free of toner? If not, remove
and inspect the waste toner
cartridge. Make sure the
cartridge is not damaged or
leaking.
2. Remove and inspect the
imaging unit. Is the exterior of
the imaging unit clean and
with no obvious toner
leakage? If not, remove and
inspect the waste toner
cartridge. Make sure the
cartridge is not damaged or
leaking.
3. Turn the carousel frame and inspect the four developer assemblies. Does
each developer assembly appear clean, without any obvious toner on the
exterior of the assembly or falling from the magnetic brush? Clean the
dirty developer assembly. If the problem reoccurs, replace the faulty
developer assembly.
4. Inspect the fuser. Is the fuser free of toner? Clean the fuser, if necessary.
5. Remove and inspect the accumulator belt cleaner assembly. Is the
accumulator belt cleaner assembly clean and with no obvious toner
leakage? If not clean or replace the accumulator belt cleaner assembly, if
necessary.
6. With the accumulator belt cleaner assembly removed, inspect the
accumulator belt cleaner end of the auger. Is the auger clogged? Clean the
printer interior.
7. Remove the rear cover. With the accumulator belt cleaner assembly
removed, watch the auger drive gear as you manually rotate the paper
feed motor. Does the fuser drive assembly rotate the auger drive gear? If
not, replace the fuser drive assembly.
8. As you manually rotate the paper feed motor place your finger inside the
auger opening and feel the movement of the auger spring. Does the auger
spring rotate when you manually rotate the paper feed motor? If not,
replace the auger assembly.
9. Replace the imaging unit.
3041-58
Service Guide 63
Media jams and the paper path
Skewed image
The image area is twisted or is not parallel with the sides of the page. The printer
neither jams nor displays an error code.
1. Check that the paper tray’s metal hooks (at the corners of the leading
edge of the paper in the tray) are not bent or deformed.
2. Feed paper out of each of the available paper feeders. Does the image
skew when fed out of one tray but not when fed out of the others? If yes,
Inspect the paper and tray of the feeder that is skewing to ensure the tray
is correctly loaded and the paper is good.
3. Replace the multi-purpose tray pick-up roller or the main tray feed roller.
4. Print a test print and slide the paper feeder out about 10 seconds after
pressing PRINT. Carefully slide the paper feeder out of the printer and
inspect the position of the sheet of paper. Is the sheet of paper parallel to
the edges of the paper feeder? If not, replace the turn roller assembly.
5. Generate a test print and slide the fuser out of the printer just as the sheet
of paper is moving through the registration rollers. Carefully slide the
paper feeder out of the printer and inspect the position of the sheet of
paper. Is the sheet of paper parallel to the edges of the paper feeder as it
leaves the registration rollers? If no, clean or replace the feeder rubber
registration roller.
6. Remove second bias transfer roller. Manually raise and lower the cam
levers at the ends of the second bias transfer roller. Are the cam levers
undamaged? When you raise the levers does the second bias transfer
roller lower and when you release the levers does the second bias transfer
roller raise? Do the cam levers have a strong spring action? If not, replace
the second bias transfer roller.
64 Phaser 780 Color Printer
Damaged prints
The printed page exits the printer either wrinkled, creased, or torn. The printer
neither jams nor displays an error code.
The following components are associated with this specific problem. One or more
of these components may have failed partially or completely. If you cannot isolate
the problem, replace each component listed below, one at a time, until the
problem disappears. Check the media settings at the printer driver.
■Paper feeder (usually appears without toner in creases or wrinkles)
■Fuser)
■Accumulator belt (usually appears with toner in creases or wrinkles)
1. Check that the paper tray’s metal hooks (at the corners of the leading
edge of the paper in the tray) are not bent or deformed.
2. Feed paper out of each of the available paper feeders. Is the paper
damaged when fed out of one tray but not when fed out of the others? If
so, inspect the tray for damage and check the paper to ensure it is correct.
3. Is the paper damaged when fed out of multi-purpose tray? Inspect the
multi-purpose tray for debris or obviously broken components that could
be damaging the paper as it feeds out of the assembly and into the printer.
4. Inspect the paper feeder for debris or broken components?
5. Generate a test print and open the front cover just as the sheet of paper is
moving through the registration rollers (about 1 second after you hear
paper feeding start).
6. Carefully slide the paper feeder out of the printer and inspect the sheet of
paper. Is the sheet of paper undamaged as it leaves the registration
rollers? If yes, replace the metal registration roller and the rubber
registration roller.
7. Generate a test print and open the front cover just before the sheet of
paper reaches the fuser. Open the front cover and inspect the sheet of
paper. Is the sheet of paper undamaged as it leaves the second bias
transfer roller? If yes, replace the second bias transfer roller.
8. Generate a test print and open the front cover just as the sheet of paper
exits the fuser. Inspect the sheet of paper. Is the sheet of paper damaged
as it exits the fuser? If yes, replace the fuser.
9. Generate a test print and open the upper exit cover just as the sheet of
paper reaches exit roller. Inspect the sheet of paper. Is the sheet of paper
undamaged as it nears exit roller? If no, clean or replace the lower exit
assembly and the upper exit assembly. Is the sheet of paper undamaged
until it reaches exit roller? If yes, replace exit roller.
Service Guide 65
Inoperative lower tray feeder
The lower tray feeder does not work at all, the lower tray feeder does not attempt
to feed paper, and the problem is not identified by a displayed error code.
1. Ensure the printer driver is configured with the “optional trays”
installed.
2. Try printing using a different application program.
3. Try printing using a different printer driver.
4. Try printing from another computer.
5. Check the wire harness that is running between the paper feeder circuit
board to the engine control board. Ensure the wire harnesses are
connected to P/J131 and 132 on the lower feeder circuit interface board
6. Generate test prints from Tray 2, Tray 3, and Tray 4. Does the printer
generate a test print from any of the lower feeder trays? If no, go to
Step 10.
7. Remove the lower feeder rear cover.
8. Measure the voltage between P/J133-B5 and frame ground on the lower
feeder circuit board. Is there +5VDC between P/J133-B5 and frame
ground on the lower feeder circuit board? If not, verify that +5 VDC on
P33-10 the low voltage power supply.
9. Measure the voltage between P/J133-B1 and frame ground and between
P/J133-B2 and frame ground on the lower feeder circuit board. Is there
+24VDC between P/J133-B1 and ground and between P/J133-B2 and FG?
If not, verify the +24VDC on pins 13 and 14 of the low voltage power
supply and the engine control board.
10. Replace the lower tray feeder circuit board.
11. Replace the engine control board.
Power problems
All front panel indicators remain off. The printer does not initialize upon power-
up
1. Check to see if the printer is plugged in.
2. Check the power on/off switch.
3. Reset the fuser and the paper feeder.
4. Refer to the topic “Printer will not power up” on page 40.
66 Phaser 780 Color Printer
Front panel indications
Media tray indicates missing or empty when it is not
1. If there is media in the tray, then check the media sensors. If the lower
feeder is available, switch trays to verify the source of the problem
2. Check to see if the paper-empty sensor is broken.
3. Run service diagnostics on the media sensors.
4. Check the media selection switch actuators on the rear of the paper tray.
Also check the paper size switches at the rear of the printer frame or the
lower feeder.
Macintosh printing problems
Image never prints
Printer acts as if it is receiving data, but nothing comes out of printer or it goes
back to “Ready” mode without printing image.
1. Power cycle the printer and print again.
2. Make sure that the correct Phaser 780 printer icon was selected in the
Chooser. Try printing the job again.
3. In the Chooser or the print dialog, switch background printing to off. Try
printing the job again.
4. Ensure that the printer can print by printing an internal front panel test
print.
5. Enable the Error Handler through the front panel and try printing the job
again. If an error page is printed after printing the job again, call the
Customer Support Hotline for further assistance. Please have the error
page in hand.
If available, try printing to a black-and-white PostScript printer (such as
an Apple LaserWriter). If the file does not print on the black-and-white
PostScript printer, this may mean that the problem may be application- or
network-related.
Image prints in black-and-white
1. In the print driver dialog box, make sure the Color/Grayscale option has
been selected.
2. Check the version of your LaserWriter driver to ensure that it is version
6.0.7 or higher. Earlier versions of the driver do not support color
PostScript. The application may require special instructions to print.
3. Ensure the driver setting TekColor is not set to Monochrome mode.
Service Guide 67
Image is rotated 90 degrees
1. In the application's Page Setup, make sure that the image is selected to
print in portrait or landscape orientation to match the document. Also
ensure the selected paper size is correct.
2. Ensure that the printer can print by printing an internal front panel test
print.
3. Enable the Error Handler through the front panel and try printing the job
again. If an error page is printed after printing the job again, call the
Customer Support Hotline for further assistance. Please have the error
page in hand.
If available, try printing to a black-and-white PostScript printer (such as
an Apple LaserWriter). If the file does not print on the black-and-white
PostScript printer, this may mean that the problem may be application- or
network-related.
Windows printing problems
Image never prints
Printer acts as if it is receiving data, but nothing comes out of printer or the
printer goes back to “Ready” mode with out printing image.
1. Under the printer's setup options, set RETRY = 850
2. Try printing from the printer driver.
3. Try printing from another application.
4. Try printing to another printer.
5. Try printing from another computer.
6. Try printing an internal front panel test print.
Blue color on the screen is printing too purple.
Many applications describe color as percentages of a video display screen’s
primary colors: red, green, and blue (RGB). When a printer translates these RGB
colors into its own primaries of cyan, magenta, and yellow (CMY), blue is often
printed as purple.
1. To adjust blue from within Microsoft Windows: Within the Tektronix
PostScript Windows driver you have an option, Vivid Color, that alters
to blue colors that are appearing purple.
To Access this option, select:
Printer Control Panel
Right click Printer Driver
Choose Properties
Choose Color Corrections
Select Vivid Color
68 Phaser 780 Color Printer
Printing from Windows 3.1 produces the message “Problem writing device
LPT1: Cancel or Retry”.
Option #1:
1. Select Printers, and click Configure.
2. Change the port selection from LPT1 to LPT1.OS2.
3. The MODE command disables DOS timeouts. The LPT1.OS2 selection
forces Windows to print through DOS instead of directly to the printer.
Option #2: The solution above does not allow users to spool documents using the
PrintManager. To use the PrintManager as well as correcting time-out problems,
edit the following line in the win.ini file:
TransmissionRetryTimeout=45 to:
TransmissionRetryTimeout=850
In Windows 3.1:
1. Follow the above instructions for issuing the MODE command in DOS.
2. Start Windows.
3. Select the Control Panel from the Main menu.
4. Select Printers
5. Select the appropriate printer and click on Connect.
6. Uncheck the Fast Printing Direct to Port box.
Workstation printing problems
Image never prints
Printer acts as if it is receiving data, but nothing comes out of the printer or the
printer goes back to “Ready” mode without printing an image.
For serial or parallel printing. Ensure that the print file ends with a “CTRL-D”
character. CTRL-D indicates the end-of-file, which the printer responds to by
closing host-to-printer communications and then processing and printing the file.
Use a text editor to open and examine the file. There is a utility file that you can
use to tag or remove a CTRL-D to the end of a print file. TCP/IP and Novell
protocols do not accept CTRL-D with the print files. Refer to the network user
manual.
Service Guide 69
Running built-in diagnostics
The printer diagnostic interface consists of a front panel containing a 2 line by
40 character LCD display and six buttons. For diagnostics, the front panel
switches are identified as 1 through 6 with switch 1 being the left-most switch
and switch 6 being the right-most switch.
To place the printer in service diagnostics mode. Turn on the printer and wait for a
string of “*” to appear on the front panel display, as they appear, press and hold
button 3 for five seconds. You select individual test by navigating a tree-structure
with three buttons defined as Prev, Next, and Select.
Help Mode. You can enter a Help mode at the top level by pressing Prev or Nest
until Help Mode On/Off is displayed. Once you select Help mode and “H” is
displayed on the lower-right corner of the display. With help mode enabled, once
you select a test, information about the test is displayed in the top line of the
display. Buttons 3 and 4 are relabeled as Quit and More. Pressing More displays
additional information about the test. Pressing Quit leaves the test description
and asks if you want to run the test.
Table 1 Diagnostic tests
Test Sub-tests Detail
Service Print Source Tray 1
Tray 2
Tray 3
Tray 4
MPT
Output Right Side
Top Cover
Media Paper
Transparency
Label
Cover
Print Black Grid
Color Grid
Black Patch
Color Patch
Paper Path Test
Image Processor Kernel, DIMMs, ROMs,
I/O
Engine ROM Revision
70 Phaser 780 Color Printer
Sensors Belt Home Sensor
Carousel Home Sensor
Waste Cartridge Sensor
Waste Cartridge Full
Sensor
Full Stack Sensor
Exit Sensor
New Toner Sensor
Toner Cartridge Present
Sensor
Paper Feeder Interlock
MPT Long Paper Sense
MPT Paper Sensor
MPT Edge Sensor
Registration Sensor
Oil Roller Switch
New Oil Roller Switch
Fuser Interlock Switch
Fuser Entry Sensor
Fuser Exit Sensor
Front Cover Interlock
Lower Feeder Interlock
Tray 1 Present Indicates Missing or Size
of media selection
Tray 2 Present
Tray 3 Present
Tray 4 Present
Table 1 Diagnostic tests
Test Sub-tests Detail
Service Guide 71
Sensors (cont.) Tray 1 Low Sensor
Tray 1 Empty
Tray 2 Low Sensor
Tray 2 Empty
Tray 3 Low Sensor
Tray 3 Empty
Tray 4 Low Sensor
Tray 4 Empty
Auto-density Calibration
Sensor Pass/Fail test of sensor
and its wiper solenoid;
for solenoid portion of
test, listen for clicks of
sensor wiper solenoid.
Motors/Solenoids Process Motor Slow/Fast
Paper Feed Motor On/Off
Laser Motor On/Off
Toner Dispense Motor One Time
Lower Feeder Motor On/Off
MPT Feed Clutch
MPT Pick Solenoid
MPT Pre-Registration
Clutch
MPT Registration Clutch
Developer Clutch
Second Bias Transfer
Clutch
Oil Roller Solenoid
Belt Cleaner Solenoid
Tray 2 Pick Solenoid
Tray 3 Pick Solenoid
Tray 4 Pick Solenoid
Tray 2 Feed Clutch
Table 1 Diagnostic tests
Test Sub-tests Detail
72 Phaser 780 Color Printer
Motor/Solenoids (cont.) Tray 3 Feed Clutch
Tray 4 Feed Clutch
Rear Fan Slow/Fast Speed
Fuser Fan Slow/Fast Speed
Erase lamp On/Off
Fuser Lamp (heater) On/Off
Front Panel Front Panel Display
Front Panel LEDs
Life Data Save Life Count The Save function copies
all consumable and FRU
counts from the engine
control board NVRAM to
the image processor
board. The Restore
function returns the
values to the engine
control board NVRAM.
The Save function must
be performed prior to
replacing the engine
control board. Perform
the Restore function
after the replacement
Restore Life Count
Drum Unit Life
Yellow Toner Life
Magenta Toner Life
Black Toner Life
Cyan Toner Life
Printer Life
Bias Transfer Roller Life
Belt Cleaner Life
Fuser Oil Life
Fuser Unit Life
Reset Fuser Life Perform the appropriate
reset function whenever
one of these FRUs is
replaced to return that
FRUs copy count to zero
Reset Bias Transfer
Roller Life
Reset Belt Cleaner Life
Table 1 Diagnostic tests
Test Sub-tests Detail
Service Guide
73
Adjustments
This topic discusses using the front panel’s interactive mode to review and
change the printer’s operation. It also contains the procedures to calibrate the
printer after you replace key Field Replaceable Units and to evaluate the printer's
functionality.
Printing test prints
The prints printed via the front panel the are generated by the image processor.
While the printer is idle you can use the front panel to print an image stored in the
image processor such as the configuration page.
Print service test prints
The service prints allow you to evaluate the printer’s print quality.
1.
Press the
Printer
Menu
Select
button.
2.
Select the
Help Pages.
3.
Scroll to either
Service Print 1
or
Service Print 2
and press
Print
.
Printing the configuration page
The configuration page shows a great deal of information regarding the data and
set-up values stored in NVRAM. In the same Help pages menu you can also print
the startup page.
1.
Press the
Printer
Menu
Select
button.
2.
With the
Help pages
menu displayed, scroll to the
Configuration
Page
menu item. Press
Print
.
Printing the demonstration pages
Demo pages demonstrate the capabilities of the printer.
1.
Press the
Printer
Menu
Select
button.
2.
With the
Help pages
menu displayed, scroll to the
Demonstration
Page
item. Press
Print
.
74
Phaser 780 Color Printer
Print engine calibration
Generally, only one print engine calibration is required. Usually, if you note a
print defect, replacing a toner cartridge, a developer or the imaging unit or
perhaps the paper feeder corrects the problem.
Adjusting for impulse banding
Impulse banding is a print artifact that occurs on prints when the developer roller
comes into contact with the drum. This adjustment adds shims to the carousel
assembly to slightly alter the position of each developer assembly relative to the
drum.
Note
The shims used in this adjustment permanently clip into place
and can be difficult to remove. You should modify a set of shims
by cutting the clips off of the shims so they can be inserted and
removed easily. Once you determine the correct shims required,
install permanent shims in their place.
1.
Ensure the printer is in a ready-to-operate condition.
2.
Turn off the printer.
3.
Remove the top cover.
4.
With a pen or marker (no pencil), scribe a line across the white tracking
roller located at the front of the developer roller.
5.
Position the white roller so the mark is even with the edge of the nearly
developer frame.
6.
Hold the carousel lock so it will not impede the carousel’s movement.
7.
With a slow, smooth action, rotate the carousel assembly 180
o
. Do not
allow the carousel to stop as the developer pass the drum surface.
Continue rotating the carousel to bring the marked developer to its
starting position.
8.
As the developer roller contacts and passes the drum surface, the
developer should rotate about 2 mm. Too much rotation, caused by the
roller contacting the drum too soon, causes impulse banding.
Inspect the white tracking roller for movement. If the mark is within
2 mm of its original position, no adjustment is needed.
If the mark is rotated beyond 2 mm, a shim is required.
9.
Generally, a 1 mm shim usually corrects impulse banding. Install a
shim in the side of the carousel assembly for the developer being tested.
10.
Repeat the procedure from Step 5 until the rotation is about 2 mm. If
rotation is not enough, use a smaller shim. Too much, use a larger shim.
11.
Repeat for each developer.
Service Guide
75
Adjusting for impulse banding
Place mark on
white roller After carousel rotation
mark should move 2mm
Install shim
Developer
roller
Lift up slightly
to install shim
Toner
3041-32
76
Phaser 780 Color Printer
Service Guide
77
Cleaning and
Maintenance
Service preventive maintenance procedure
Whenever you check, service, or repair a printer, you should perform the following
procedures. Cleaning the printer, as outlined in the following steps, assures proper
operation of the printer and reduces the probability of having to service the printer in
the future.
The frequency of use and the type of paper a customer prints on will, in large part,
determine how critical cleaning the machine is. Users of ordinary Bond paper (copier
paper) should have very few problems since this paper is smooth and relatively dust-
free. You should thoroughly inspect and clean these printers.
Ask each printer customer about the type of paper he or she uses so that you can be
sure to clean the parts of the printer that particular paper may affect. If a customer is
printing on the more unusual or dustier papers, then you should pay particular
attention to these printer parts:
■
The standard pick roller
■
The multi-purpose pick roller
■
The feed rollers
■
The cabinet interior
■
The exit rollers
Recommended tools
■
Toner vacuum cleaner
■
Suction bulb (air blower)
■
Cleaning water
■
Lint-free wipes
■
Cotton swabs
■
Imaging unit cover
■
Isopropyl alcohol (greater than 90% pure)
78
Phaser 780 Color Printer
Cleaning
Caution
Never
apply alcohol on the second bias transfer roller.
Never
apply alcohol to the fuser rollers.
1.
Turn off the printer.
2.
Remove the imaging unit and cover it to protect it from the light.
3.
Remove the toner cartridges.
4.
Slide out the fuser.
5.
Remove the paper tray.
6.
Slide out the paper feeder.
7.
Clean all printer rollers, except the second bias transfer roller and the
fuser rollers, with alcohol-dampened wipes only.
8.
Clean the laser window with puffs of air from the suction bulb.
Alternately, you can vacuum the window clean.
9.
Wipe off the pre-exposure erase lamp with a lint-free wipe.
10.
Vacuum out the interior of the printer.
11.
Vacuum loose toner out of the carousel assembly.
12.
Remove and clean the accumulator belt cleaner assembly. Removing
the accumulator belt cleaner assembly is explained on the
Phaser 780
Service CD-ROM
. Once removed, gently vacuum the cleaner assembly
using a vacuum with a brush attachment. Do not touch the cleaner
blade with your hands nor bend or crease the film seal.
13.
If you must clean the fuser rollers,
never
clean them with alcohol. First
clean the fuser rollers by processing 10 sheets of paper through the
printer. If more cleaning is needed, clean the rollers with a soft, lint-
free cloth with either fuser oil or water.
Service Guide
79
Resetting NVRAM
Resetting NVRAM returns all the image processor's NVRAM-stored parameters
to their factory defaults except the print counts and the Adobe firmware serial
number.
Caution
Resetting NVRAM will also reset the network card’s NVRAM.
If possible, copy down all network parameters or print the
Configuration Page.
To reset the image processor to its factory default values, follow this procedure:
1.
Turn on the printer
2.
When the row of “
*
”, begins to be displayed on the front panel, press
and release button 1 and then press and release button 4.
3.
When the front panel displays “
Password?
”, press and release button 1,
then press and release button 3. The display responds with the message
“
Resetting NVRAM
.” Following NVRAM reset, the print powers up
normally.
80
Phaser 780 Color Printer
Service Guide
81
Key FRU Disassembly
This topic illustrates how to remove and replace key printer Field Replaceable
Units (FRUs). Refer to the later topic “FRU List” on page 137 for a list of the
printer’s FRUs. For more detailed removal/replacement procedures refer to the
Phaser 780 Service CD-ROM
.
82
Phaser 780 Color Printer
Paper feeder
1.
Slide the paper feeder far enough out of the printer so you can reach the
assembly rails.
2.
Push in on the front rail latch as you slide the front of the paper feeder
out far enough to disengage the latch.
3.
Push in on the rear rail latch as you slide the rear of the paper feeder out
far enough to disengage the latch.
4.
Slide the paper feeder out of the printer.
Reverse these steps to install the paper feeder.
Removing the paper feeder
780-5-34
Front latch
Rear latch
Service Guide
83
Feeder registration chute
1.
Slide the paper feeder out of the printer. You do not need to remove the
paper feeder.
2.
Remove the E-ring securing the rear arm of the registration chute to the
paper feeder.
3.
Remove the screw securing the ground wire to the chute. Remove the
wire.
4.
Open the registration chute.
5.
Slide the chute to the rear and remove the chute.
Reverse these step to install the registration chute.
Removing the registration chute
Ground
wire
Registration
chute
780-5-37
84
Phaser 780 Color Printer
Feeder registration clutch
1.
Remove the paper feeder as described in “Paper feeder” on page 82.
2.
Turn over the paper feeder and disconnect the wiring harness from the
registration clutch.
3.
Open the registration chute.
4.
Remove the E-ring securing the registration clutch to the rear of the
metal registration roller. Remove the registration clutch from the roller.
Reverse these steps to install the registration clutch.
Removing the registration clutch
Registration clutch
Wiring harness
780-5-40
Service Guide
85
Registration brake clutch
1.
Remove the paper feeder as described in “Paper feeder” on page 82.
2.
Turn the paper feeder over and disconnect the wiring harness from the
registration brake clutch.
3.
Remove the three screws securing the registration brake clutch
assembly to the side of the paper feeder. Remove the assembly.
4.
Remove the E-ring securing the registration brake clutch to the clutch
shaft and remove the clutch.
5.
Remove the E-ring securing the registration brake gear to the gear shaft.
Remove the gear.
Reverse these steps to install the registration brake clutch.
Removing the registration brake clutch
780-5-46
Registration brake
assembly
Registration brake gear
Registration brake
clutch
Wiring harness
86
Phaser 780 Color Printer
Feeder metal registration roller
1.
Remove the feeder registration clutch as described in “Feeder
registration chute” on page 83.
2.
Remove the registration brake clutch as described in “Registration
brake clutch” on page 85.
3.
Remove the E-ring securing the out gear at the front end of the metal
registration roller. Remove the gear.
4.
Remove the rear bearing from the metal registration roller.
5.
Slide the metal registration roller to the rear, slide the front of the roller
out of the front bearing, and remove the roller from the main paper
feeder.
Reverse these steps to install the feeder metal registration roller.
Removing the metal registration roller
Metal registration roller
Rear bearing
Front bearing
Out gear
780-5-41
Service Guide
87
Feeder rubber registration roller
1.
Remove the feeder metal registration roller.
2.
Remove the E-ring at the front of the rubber registration roller securing
the gear to the roller. Remove the gear.
3.
Remove the E-ring securing the rear of the rubber registration roller to
the paper feeder.
4.
Remove the rear bearing and
black
spring from the rear end of the
rubber registration roller.
5.
Slide the rubber registration roller out of the paper feeder. Note the
silver
spring and bearing on the front end of the roller.
Reverse these steps to install the feeder rubber registration roller. The front
portion of the shaft is longer than the rear.
Removing the rubber registration roller
Rear bearing
Rear
spring
(black)
Front
bearing
Gear Front spring (silver)
Rubber registration roller
780-5-42
88
Phaser 780 Color Printer
Feeder pre-registration clutch
1.
Remove the paper feeder.
2.
Remove the feeder registration chute.
3.
Turn over the paper feeder and disconnect the wiring harness from the
feeder pre-registration clutch.
4.
Remove the two screws securing the feeder pre-registration gear
assembly to the paper feeder. Remove the gear assembly.
5.
Remove the E-rings securing the feeder pre-registration clutch and the
pre-registration gear to the pre-registration support. Remove the
support.
6.
Slide the feeder pre-registration gear off the shaft.
7.
Undress the J95 wiring harness and slide the feeder pre-registration
clutch off the feeder pre-registration shaft.
Removing the feeder pre-registration clutch
Pre-registration
gear
Pre-registration
clutch
P/J95 Pre-registration
support
Pre-registration
gear assembly
780-5-39
Service Guide
89
Feeder pre-registration rollers
1.
Remove the feeder pre-registration clutch as explained in the previous
procedure.
2.
Slide the blue feeder pre-registration knob off the feeder pre-
registration shaft.
3.
Remove two screws securing the multi-purpose tray out holder to the
paper feeder. Pull the holder away from the feeder.
4.
Remove the E-ring and front bearing securing the front of the feeder
registration shaft to the paper feeder frame.
5.
Remove the E-ring and rear bearing securing the idler gear to the rear of
the feeder pre-registration shaft. Remove the idler gear.
6.
Lift the pre-registration roller up.
7.
Slide the feeder pre-registration roller to the rear of the paper feeder,
freeing the front of the shaft from front of the paper feeder.
8.
Slide the feeder pre-registration roller to the front, free the rear of the
shaft from the rear of the paper feeder.
9.
Slide the feeder pre-registration roller free of feeder pre-registration
gear 2. Remove the shaft.
Note
For reassembly, ensure the shaft pin lines up with the slot in pre-
registration gear 2.
90
Phaser 780 Color Printer
Removing the feeder pre-registration roller
780-5-38
Out holder
Pre-registration
knob
Front
bearing
Pre-registration roll shaft
Pre-registration gear 2
Idler gear
Service Guide
91
Paper-pick turn roller
1.
Remove Tray 1 from the printer.
2.
Remove the paper feeder.
3.
Remove the two screws securing the turn chute to the printer frame.
Remove the turn chute.
4.
Remove the paper-pick turn chute.
5.
Remove the two screws securing the tray stopper to the printer frame.
Remove the stopper.
6.
Remove the E-ring securing the front of the turn roller shaft to the front
bearing.
7.
Disconnect the turn arm spring from the printer frame.
8.
Remove the E-ring securing the round cover over the turn-arm gear.
Remove the cover.
9.
Slide the rear of the turn roller shaft out of the turn-arm assembly.
10.
Slide the front of the turn roll shaft out of the front bearing. Remove the
turn roller.
Removing the paper-pick turn roller
Tray stopper
Turn chute
Turn roller
spring
Front bearing
780-5-14
92
Phaser 780 Color Printer
Paper feed drive gear train
1.
Remove the high voltage poser supply as described in “High voltage
power supply” on page 132.
2.
Slide the paper feeder out of the printer.
3.
Remove the screw securing the wire clip to the paper-feed drive gear
train. Move the clip and harness out of the way.
4.
Remove the five screws securing the paper-feed drive gear train to the
printer frame. Remove the gear train.
5.
Remove the two wire clamps from the paper-feed drive gear train.
Reverse these steps to install the paper-feed drive gear train.
Removing the paper-feed drive gear train
Wire clip
780-5-73
Wire clamps
Paper feed drive gear train
Service Guide
93
Paper-feed motor
1.
Remove the rear cover.
2.
Disconnect the wiring harness from the paper-feed motor.
3.
Remove the four screws securing the paper-feed motor to the fuser
drive gear train. Remove the motor.
4.
Remove the two motor supports.
Reverse these steps to install the paper-feed motor.
Removing the paper-feed motor
Motor
supports
780-5-7
5
Wiring harness
Paper feed
motor
94
Phaser 780 Color Printer
Multi-purpose tray roller assembly
1.
Remove the multi-purpose tray top, front and rear covers.
2.
Unhook the pick-up spring from the pick-up gear.
3.
Release the latches holding the pick-up gear to the pick-up shaft. Slide
the pick-up gear, pick-up cam gear, and lever stopper off the shaft.
4.
Remove the E-ring securing the rear shaft bearing to the rear of the
multi-purpose tray.
5.
Remove the E-ring securing the front shaft bearing to the front of the
multi-purpose tray.
6.
Slide the multi-purpose tray roller assembly out of the multi-purpose
tray assembly.
Removing the multi-purpose tray roller assembly
Rear bearing
Front
bearing
Lever stopper Pick up cam gear
Pick-up
gear
780-5-27
Service Guide
95
Multi-purpose tray pick rollers
Note
Replace the pick rollers as a set.
1. Remove the multi-purpose tray top cover.
2. Release the latch holding the front pick roller core to the pick up shaft
and slide the core away from the front pick roller.
3. Slide the front pick roller toward the front roller core, so the pick up roll
clears the locking pin. Remove the front pick roller.
4. Release the latch holding the rear roller core to the pick roller shaft and
slide the roller away from the rear pick roller.
5. Slide the rear pick up roller toward the rear roller core, so the pick roller
clears the locking pin. Remove the rear pick roller.
96 Phaser 780 Color Printer
Reverse these steps to install the multi-purpose tray pick rollers. Note the arrows
molded into the sides of the pick roller; ensure they are oriented the correct
direction upon installation.
Removing the multi-purpose tray pick rollers
780-5-26
Latch
Front core rollers
Printer front
Pick-up rollers
Rear core rollers
Service Guide 97
Auto-density calibration sensor
Caution Protect the accumulator belt with a sheet of paper.
1. Remove the imaging unit. Remove the inner cover.
2. Disconnect the wiring harness from the auto-density calibration sensor.
3. Remove the E-ring securing the front of the auto-density calibration
sensor to the front of the printer frame.
4. Reach inside the printer cavity and slide the front end of the auto-
density calibration sensor out of the hole at the front of the printer.
5. Pull the wiring harness out through the grommet hole.
Caution Do not touch or scratch the accumulator belt when removing the
auto-density calibration sensor.
6. Lift the rear end of the auto-density calibration sensor out of the cutout
at the rear of the printer. Remove the sensor.
For reassembly, ensure the rear of the sensor is fully installed in the rear cutout.
98 Phaser 780 Color Printer
Removing the auto-density calibration sensor
780-5-48
Auto-density
calibration sensor
Rear cutout
Service Guide 99
Developer assembly
1. Open the front cover. Remove the toner cartridge of the developer
assembly to be removed. Remove the imaging unit.
2. Remove the top cover and inner cover.
3. Remove the screw securing the carousel latch to the front of the printer
frame. Remove the latch.
4. Turn the carousel knob until the large shoulder screw, securing the
desired developer assembly to the carousel frame, appears through the
access hole a few inches above the carousel knob.
5. Remove the shoulder screw securing the developer assembly to the
carousel frame. Keep the carousel in this position.
6. Reach in through the top of the printer; slide the developer assembly to
the front of the printer to free the gears at the rear of the developer
assembly.
7. Lift the front of the developer assembly to free the front of the assembly
from the front of the printer frame. Remove the assembly. Each
developer is keyed to its position in the carousel.
100 Phaser 780 Color Printer
Removing a developer assembly
Shoulder screw
Developer assembly
Carousel latch
780-5-53
Remove shipping
developer cover
before installing new
developer assembly
Service Guide 101
Developer clutch
1. Remove the carousel motor board as described in “Carousel motor
board” on page 108.
2. Disconnect the wiring harness from the developer clutch.
3. Remove the fuser drive train gear as described in “Fuser drive gear
train” on page 126.
4. Remove the four screws securing the developer clutch to the printer
frame. Remove the clutch.
Reverse these steps to install the developer clutch.
Removing the developer clutch
Developer clutch
Wiring harness
780-5-81
102 Phaser 780 Color Printer
Developer tie plate
1. Remove the lower exit assembly as described in “Lower exit assembly”
on page 128.
2. Remove the rear cover.
3. Remove the inner cover.
4. Remove the wire and wire clamp from the developer tie plate.
5. Remove the two screws securing the developer tie plate to the rear of
the printer frame.
6. Remove the two screws securing the developer tie plate to the front of
the printer frame.
7. Slide the tie plate up and out of the printer frame.
Reverse these steps to install the developer tie plate.
Service Guide 103
Removing the developer tie plate
780-5-82
Wire clamp
Developer tie
plate
104 Phaser 780 Color Printer
Toner/developer dispense motor
1. Remove the carousel motor board as described in “Carousel motor
board” on page 108.
2. Remove the two screws securing the toner/developer dispense motor
to the printer frame.
3. Slide the toner/developer dispense motor up and slightly to the left to
free the motor shaft gear from the frame. Remove the motor.
4. Disconnect the wiring harness from the toner/developer dispense
motor.
Note Install the motor using the two left-side mounting screw holes.
Reverse these steps to install the toner/developer dispense motor.
Removing the toner/developer dispense motor
Toner / developer
dispense motor
Wiring harness
780-5-80
Service Guide 105
Carousel assembly
1. Remove each developer assembly.
2. Remove the knob screw.
3. Remove the screw securing the knob in place. Release the knob latch by
inserting a screwdriver blade through the slot in the front of the knob.
4. Remove the carousel motor.
5. Remove the toner/developer dispense motor.
6. Pull the fuser unit a few inches out of the printer.
7. Remove the low voltage power supply.
8. Remove the fuser drive gear train.
9. Remove the developer clutch.
10. Remove the developer tie plate.
11. Remove the carousel sensor.
12. Remove the large E-ring securing the rear carousel bearing to the rear of
the printer frame. Slide the rear bearing off the carousel frame shaft.
13. Slide the front carousel bearing off of the carousel frame shaft.
14. Slide the carousel frame assembly to the front of the printer frame.
15. Pull the rear of the carousel frame assembly free of the rear frame;
swing the rear of the assembly out of the printer. Remove the assembly.
106 Phaser 780 Color Printer
Removing the carousel assembly
780-5-54
Rear
bearing
Carousel
assembly
Front
bearing
Screw
Service Guide 107
Carousel motor
1. Remove the rear cover.
2. Disconnect the wiring harness from the carousel motor.
3. Remove the three screws securing the carousel motor to the printer
frame. Remove the motor.
Reverse these steps to install the carousel motor.
Removing the carousel motor
780-5-78
Wiring
harness
Carousel motor
108 Phaser 780 Color Printer
Carousel motor board
1. Remove the rear cover.
2. Remove the wiring harnesses from the carousel motor board.
3. Remove the screw securing the carousel motor board to the printer
frame. Remove the board.
Reverse these steps to install the carousel motor board.
Removing the carousel motor board
780-5-79
Wiring harness
Carousel motor board
Service Guide 109
Carousel sensor
1. Remove the developer fan duct.
2. Remove the screw securing the carousel sensor plate to the printer
frame. Remove the plate, along with the attached carousel sensor, from
the frame.
3. Disconnect the wiring harness from the carousel sensor.
4. Squeeze the three latches securing the sensor to the plate and remove
the sensor.
Reverse these steps to install the carousel sensor.
Removing the carousel sensor
780-5-56
Carousel
sensor plate
Carousel sensor
Wiring
harness
110 Phaser 780 Color Printer
Laser unit
1. Remove the top cover.
2. Remove the eight screws securing the laser unit cover to the printer
frame and remove the cover.
3. Disconnect the wiring harnesses from the laser diode board.
4. Disconnect the wiring harness from the start-of-scan sensor board.
5. Remove the four screws securing the laser unit to the printer frame.
6. Carefully lift the laser unit off the printer frame. Reach under the unit
and disconnect the wiring harness from the laser unit motor board.
7. Remove the laser unit.
Reverse these steps to install the laser unit.
Service Guide 111
Removing the laser unit
Laser unit
Laser cover
780-5-47
112 Phaser 780 Color Printer
Erase lamp rail assembly
1. Remove the imaging unit.
2. Remove the laser unit as described in “Laser unit” on page 110.
3. Disconnect the wiring harness from the waste cartridge full sensor.
4. Disconnect the wiring harness from the waste cartridge sensor.
5. Free the wiring harnesses from the wire clamps.
6. Disconnect the wiring harness from the erase lamp.
7. Remove the two screws securing the erase lamp rail assembly to the
front of the printer frame.
Caution Be careful not to damage the accumulator belt underneath the
erase lamp rail assembly.
8. Lift the erase lamp rail assembly up through the top of the printer
frame.
Reverse these steps to install the erase lamp rail assembly.
Service Guide 113
Removing the erase lamp rail assembly
Wire clamps
780-5-50
Erase lamp
rail assembly
Disconnect wiring harnesses
114 Phaser 780 Color Printer
Erase lamp
1. Remove the erase lamp rail assembly as described in “Erase lamp rail
assembly” on page 112.
2. Release the three latches holding the erase lamp assembly to the erase
lamp rail assembly. Remove the lamp.
Reverse these steps to install the erase lamp.
Removing the erase lamp
Erase lamp latch
Erase lamp
780-5-49
Service Guide 115
Process drive unit
1. Remove the imaging unit.
2. Remove the paper feeder.
3. Remove the paper feeder drive assembly.
4. Remove the erase lamp rail assembly.
5. Disconnect the wiring harness leading to the process motor. Unhook
the wires from the wire harness clip attached to the process drive unit.
6. Remove the screw securing the high voltage power supply bracket.
Move the bracket out of the way.
7. Inside the printer frame, remove the two screws securing the process
drive unit to the rear of the accumulator belt assembly.
8. Hold the process drive gear train, it is heavy, while you remove the
seven screws securing the drive unit to the printer frame. Carefully pull
the assembly away from the frame.
Reverse these steps to install the process drive unit. Ensure the front bearing of
the accumulator belt assembly is inserted fully into its receiver hole of the printer
frame.
116 Phaser 780 Color Printer
Removing the process drive unit
Wiring harness
High voltage
power supply
bracket
Process drive
unit
780
-
5
-
77
Accumulator
belt bracket
Service Guide 117
Waste auger assembly
Caution Be careful not to spill waste toner from the auger assembly.
Vacuum the auger before removal.
1. Remove the accumulator belt assembly.
2. Remove second bias transfer roller assembly.
3. Remove the paper-feed motor.
4. Remove the fuser drive gear train to access the screw securing the
plastic bracket holding the water auger housing.
5. Remove the low voltage power supply.
6. Remove the two screws securing the accumulator belt rear bracket to
the rear of the printer frame. Remove the bracket.
7. Remove the screw securing the auger drive assembly to the printer
frame.
8. Remove the screw securing the auger tube to the rear of the printer
frame.
9. Remove the screw securing the auger assembly bracket to the rear of the
printer frame.
10. Remove the auger assembly from the printer.
Reverse these steps to install the waste auger assembly.
118 Phaser 780 Color Printer
Removing the waste auger assembly
Waste auger
drive assembly
Waste auger
assembly
780-5-64
Service Guide 119
Accumulator belt assembly
1. Remove the high voltage power supply.
2. Remove the erase lamp rail assembly.
3. Remove the paper feeder.
4. Remove the process drive unit.
5. Remove the auto-density calibration sensor.
6. Reach through the paper feeder cavity and disconnect the wiring
harness from the accumulator belt sensor.
7. Move the waste auger assembly for clearance. Refer to “Waste auger
assembly” on page 117.
8. Remove the two screws securing the accumulator belt assembly bracket
to the rear of the printer frame. Remove the bracket.
Caution The accumulator belt is easily scratched, be careful when
removing it.
9. Hold on to the front and the rear of the accumulator belt assembly shaft.
Note, for reassembly, the orientation of the spring collar and K-clip.
Push in on the spring loaded collar to release the front of the
accumulator belt assembly drive shaft from the front of the printer
frame.
10. Lift up the accumulator belt assembly; free the two high voltage wires
from the grommet hole at the rear of the frame, and remove the
accumulator belt assembly out of the printer frame.
11. Place the accumulator belt assembly on a clean, flat, and stable work
surface. Do not allow the belt itself to touch any foreign surfaces.
On reassembly, remove the shipping restraints from the front and rear of the new
accumulator belt assembly. Ensure that the front bearing of the accumulator belt
assembly squarely fits into its receiver hole in the frame.
120 Phaser 780 Color Printer
Removing the accumulator belt assembly
Spring loaded
collar
780-5-59
Accumulator belt
assembly
Accumulator belt
assembly
Bearing fits
in hole
Service Guide 121
Accumulator belt cleaner assembly
1. Remove the fuser assembly as described in “Fuser assembly” on
page 125.
2. Open the front cover.
3. Reach through the empty fuser cavity and hold the bottom of the belt
cleaner assembly.
4. Loosen the two screws securing the cleaner support to the printer
frame. Remove the cleaner support while retaining the spring on the
cleaner support.
5. Slide the belt cleaner assembly to the front of the printer and remove the
assembly through the fuser cavity.
Reverse these steps to install the accumulator belt cleaner assembly. Enter
diagnostics and select Reset Accumulator Belt Cleaner Life.
Removing the accumulator belt cleaner assembly
Cleaner support
780-5-63
Accumulator belt
cleaner assembly
122 Phaser 780 Color Printer
Second bias transfer roller assembly
1. Remove the fuser assembly as described in “Fuser assembly” on
page 125.
2. Remove the accumulator belt cleaner assembly as described in the topic
“Accumulator belt cleaner assembly” on page 121.
3. Reach through the empty fuser cavity and slide the second bias transfer
roller assembly out of the second bias transfer roller front and rear
brackets and out of the printer.
Reverse these steps to install the second bias transfer roller assembly.
Removing the second bias transfer roller assembly
Second bias transfer
roller assembly
780-5-62
Service Guide 123
Second bias transfer roller cam assembly
1. Remove the second bias transfer roller assembly as described in
“Second bias transfer roller assembly” on page 122.
2. Remove the second bias transfer roller cam assembly as described in
“Second bias transfer roller cam assembly” on page 123.
3. Remove the waste auger assembly as described in “Waste auger
assembly” on page 117.
4. Remove the three screws securing the second bias transfer roller cam
assembly to the printer frame. Pull the assembly a few inches away
from the rear frame.
5. Disconnect the wiring harness running to the second bias transfer roller
cam assembly.
6. Remove the second bias transfer roller cam assembly.
Reverse these steps to install the second bias transfer roller cam assembly.
124 Phaser 780 Color Printer
Removing the second bias transfer roller cam assembly
780-5-60
Wiring harness
Second bias transfer
roller cam assembly
Service Guide 125
Fuser assembly
1. Turn off the printer and open the top media tray.
2. Remove the screw securing the fuser assembly to the printer frame.
3. Slide the fuser assembly a few inches out of the printer.
4. Lift the end of the fuser assembly and pull the assembly out of the
printer.
To install the fuser assembly in the printer, lift the end of the fuser assembly as
you insert the assembly side rails into the guide wheels inside the printer. Lower
the end of the fuser assembly and slide the assembly into the printer. Reinstall the
screw to secure the fuser assembly to the printer frame.
Removing the fuser assembly
Fuser assembly
Front
screw
Tray 1
780-18-01
Rear screw
126 Phaser 780 Color Printer
Fuser drive gear train
1. Remove the fuser unit.
2. Remove the low voltage power supply.
3. Remove the paper feed drive gear train.
4. Remove the wire harness from the paper-feed motor bracket.
5. Remove the screw securing the paper-feed motor bracket to the fuser-
drive gear train and remove the bracket.
6. Reach inside the empty fuser assembly cavity and remove the E-ring
securing the fuser drive gear shaft to the auger drive assembly.
7. Remove the five screws securing the fuser-drive gear train to the printer
frame. Remove the gear train.
Reverse these steps to install the fuser drive gear train.
Service Guide 127
Removing the fuser-drive gear train
Fuser drive
gear train
Paper feed
motor bracket
780-5-74
Auger assembly
E ring
128 Phaser 780 Color Printer
Lower exit assembly
1. Remove the left door by pushing in on its front hinge to free it from the
printer.
2. Disconnect the wiring harnesses near the top rear of the lower exit
assembly.
3. Remove the five screws securing the lower exit assembly to the printer
frame.
4. Lift the lower exit assembly to unhook the top of the assembly from the
printer frame. Remove the assembly.
5. Disconnect the wiring harness from the top exit sensor and the wiring
harness from the exit chute switch, both located on the back of the lower
exit assembly.
6. Remove the wires from the wire clips that are molded into the side of
the lower exit assembly.
Reverse these steps to install the lower exit assembly.
Service Guide 129
Removing the lower exit assembly
780-5-68
Wiring harness
Lower exit
assembly
130 Phaser 780 Color Printer
Full stack sensor
1. Open the left door.
2. Remove the screw securing the full stack sensor and its bracket.
Squeeze the four latches securing the full stack sensor to the bracket.
3. Disconnect the sensor’s connector P/J 167
Reverse these steps to install the full stack sensor.
Removing the stack full sensor
7
80
-
5
-1
58
Full stack
sensor
Service Guide 131
Low voltage power supply
1. Remove the rear cover.
2. Disconnect the wiring harness from the top of the low voltage power
supply. All the wiring harnesses plugs are held in place with locking
levers.
3. Disconnect the remaining wiring harnesses from the low voltage power
supply.
4. Release the wiring harness from the wire clip located at the top left of
the low voltage power supply.
5. Remove the four screws securing the low voltage power supply to the
printer frame. Lift and remove the low voltage power supply from the
printer frame.
Reverse these steps to install the low voltage power supply.
Removing the low voltage power supply
780-5-83
Wiring harness
Low voltage
power supply
Printer
frame
132 Phaser 780 Color Printer
High voltage power supply
1. Remove the rear cover.
2. Disconnect the wiring harnesses from the bottom of the high voltage
power supply.
3. Disconnect the five high-voltage wiring harness from the high voltage
power supply.
4. Remove the four screws securing the high voltage power supply to the
high voltage power supply brackets. Remove the high voltage power
supply.
Reverse these steps to install the high voltage power supply.
Removing the high voltage power supply
780-5-84
Wiring harness
High voltage
power supply
Service Guide 133
Image processor
1. Disconnect all interface cables connecting to the image processor.
2. Remove the right cover.
3. Disconnect all wiring harnesses from the image processor.
4. Remove the 10 screws securing the image processor to the image
processor chassis. Pull the image processor away from the chassis,
disconnecting the image processor from the engine control board.
Swap components. If you are replacing the image processor board,
exchange:
■The Boot ROM (PLCC)
■The NVRAM chip (DIP)
■The Real Time Clock module
The components contains important customer-created parameters. The printer
may not operate correctly without the components being swapped.
Also transfer from the old board to the new board.
■The RAM DIMMs
■The PhaserShare card
■The SCSI card
Removing the image processor
Front plat
e
Image processor
134 Phaser 780 Color Printer
Image processor chassis
1. Remove the image processor fan.
2. Remove the image processor as descried in “Image processor” on
page 133.
3. Loosen, but do not remove, the four screws securing the bottom of the
image processor chassis assembly to the printer frame.
4. Remove the five screws securing the top of the image processor chassis
assembly to the printer frame.
5. Lift the image processor chassis assembly up and off the four loosened
screws located at the bottom of the chassis. Remove the chassis from
the printer frame.
Reverse these steps to install the image processor chassis.
Removing the image processor chassis
780-5-91
Loosen these screws
Image processor chassis
Service Guide 135
Print engine control board
1. Perform the Life Date: Save Life Count described in “Running built-in
diagnostics” on page 69 to save the information stored in the print
engine control board NVRAM in the image processor board.
2. Remove the image processor chassis.
3. Disconnect the nine wiring harnesses connected to the print engine
control board.
4. Remove the screw securing the ground wire to the print engine control
board. Remove the wire.
5. Remove the three other screws securing the print engine control board
to the printer frame. Remove the board.
Reverse these steps to install the engine control board. Perform the Life Date:
Restore Life Count to restore the counts to the engine control board NVRAM.
Removing the print engine control board
780-5-87
Ground wire
Wiring harness
Print engine
control board
136 Phaser 780 Color Printer
Service Guide
137
FRU List
This topic provides a list of field replaceable units for the Phaser 780 Color Printer.
Changes to Tektronix products are made to accommodate improved components
as they become available. It is important when ordering parts to include the
following information:
■
Component's part number
■
Product type or model number
■
Serial number of the printer
Serial numbering.
Particular fields in the serial number indicate the modification
level of the printer, the date of its manufacture and the sequence number of the
printer produced on that day. The serial number is coded as follows:
J
LxxDMY
J
indicates the headquarter country of the manufacturing company, Japan.
L
indicates the modification level of the printer, ranging alpha-numerically
from 0 to Z.
xx
alpha-numerically indicates the sequence of the printer among the
printers produce on that day of manufacture, ranging from 01 to ZZ
representing
1 to 1296 (the letters I and O are not used).
D
alpha-numerically indicates the day of manufacture, ranging
from 1 to X representing 1 to 31 (the letters I and O are not used).
M
alpha-numerically indicates the month of manufacture, ranging
from 1 to C representing 1 to 12.
Y
numerically indicates the last digit of the year of manufacture, ranging
from 0 to 9.
138
Phaser 780 Color Printer
Printer cabinet FRUs
Z780-5-119
7a
11
6
53c
4
3a 2
1c
91c
1b 1b
1a
3b
7b
8
9
9
10
7c
12
Service Guide
139
Table 1 Printer cover FRUs
Parts Part number Serial number
Effective Discont’d Qty Name and description
1
1a
1b
1c
118-9714-00 1
2
2
Front cover assembly kit
Front cover
Hinge plate
Front cover strap
Hardware
2 118-9733-00 1 Inner cover (includes 3a and 3b)
3
3a
3b
3c
118-9715-00 1
1
1
Carousel latch kit
Carousel latch lever
Carousel latch spring
Carousel latch assembly
4 118-9737-00 1 Left lower cover
5 118-9739-00 1 Front LCD panel
6 118-9734-00 1 Top cover and stopper
7
7a
7b
7c
118-9716-00
118-9864-00
1
1
1
Rear cover assembly kit
Toner Filter
Rear cover
Access cover
8 118-9738-00 1 Right cover with shield
9 118-9884-00 1 Front lower cover
10 118-9735-00 1 Stopper
11 118-9736-00 1 Toner filter
12 118-9864-00 1 Access cover
140
Phaser 780 Color Printer
Paper feeder FRUs
Z780-5-120
10
8
5
7
9b
9c
9d
9a
9e
4
3
2
10
1
6a
6b
76c
6d
6e
6f
6g
Service Guide
141
Table 2 Paper feeder FRUs
Parts Part number Serial number
Effective Discont’dQty Name and description
1 118-9747-00 1 Size switch board
2 118-9742-00 1 Feed gear
3 118-9743-00 1 Feed spring
4 118-9744-00 1 Feed solenoid
5 118-9717-00 2 Paper pick rollers
6
6a
6b
6c
6d
6e
6f
118-9718-00 1
1
1
1
1
1
1
Turn roller assembly kit
Turn gear pin
Turn arm spring
Turn rear bearing
Turn assembly
Turn gear
Turn roller shaft
Turn front bearing
7 118-9983-00 1 Feed roller bearing
8 118-9745-00 1 Turn chute
9
9a
9b
9c
9d
9e
118-9719-00 1
1
1
1
1
Paper empty sensor assembly kit
Empty sensor harness
Empty sensor
Sensor actuator
Sensor bracket
Low paper sensor
10 118-9746-00 1 Tray stopper
142
Phaser 780 Color Printer
Multi-purpose tray cover FRUs
780-5-121
3
1
4
2
5
Service Guide
143
Table 3 Multi-purpose tray cover FRUs
Parts Part number Serial number
Effective Discont’dQty Name and description
1 118-9748-00 1 Multi-purpose tray left (front) cover
2 118-9749-00 1 Multi-purpose tray right (rear) cover
3 118-9751-00 1 Multi-purpose tray/extender
4 118-9750-00 1 Multi-purpose tray holder
5 118-9720-00 1 Multi-purpose tray assembly (items 1
thru 4)
144
Phaser 780 Color Printer
Multi-purpose tray FRUs
1
4
2
37
6
58
9
780-5-122
11
12
13
10
Service Guide
145
Table 4 Multi-purpose tray FRUs
Parts Part number Serial number
Effective Discont’dQty Name and description
1 118-9763-00 1 Multi-purpose tray pad kit
2 118-9752-00 1 Multi-purpose tray edge sensor
3 118-9754-00 1 Multi-purpose tray paper sensor actuator
4 118-9827-00 1 Multi-purpose tray paper sensor
5 118-9756-00 1 Multi-purpose tray pick-up cam gear
6 118-9757-00 1 Multi-purpose tray cam gear spring
7 118-9758-00 1 Multi-purpose tray pick-up gear
8 118-5759-00 1 Multi-purpose tray pick-up spring
9 118-5760-00 1 Multi-purpose tray pick-up solenoid
10 118-9755-00 2 Multi-purpose pick roller kit
11 118-9752-00 1 Multi-purpose tray long paper sensor
12 118-9762-00 1 Multi-purpose tray gear
13 118-9761-00 1 Multi-purpose tray clutch
146
Phaser 780 Color Printer
Paper feeder cover FRUs
780-5-123
1
2
3
Service Guide
147
Table 5 Paper feeder cover FRUs
Parts Part number Serial number
Effective Discont’dQty Name and description
1 118-9766-00 1 Paper feeder turn chute
2 118-9765-00 1 Paper feeder cover
3 118-9865-00 1 paper feeder assembly
148
Phaser 780 Color Printer
Paper feeder FRUs
1
2
3
5
4a
4b 6
7
780-5-124
Service Guide
149
Table 6 Paper feeder FRUs
Parts Part number Serial number
Effective Discont’dQty Name and description
1 118-9771-00 1 Registration rubber roller
2 118-9768-00 1 Feeder pre-registration roller
3 118-9770-00 1 Registration clutch
4
4a
4b
118-9721-00 1 Registration spring kit
Rear spring (black)
Front spring (silver)
5 118-9769-00 1 Pre-registration clutch
6 118-9767-00 1 Pre-registration knob
7 118-9752-00 1 Registration sensor
150
Phaser 780 Color Printer
Imaging FRUs
1
2
34
56
7
780-5-125
Service Guide
151
Table 7 Imaging FRUs
Parts Part number Serial number
Effective Discont’dQty Name and description
1 118-9774-00 1 Laser unit
2 118-9778-00 1 Erase lamp
3 118-9777-00 1 Auto-density calibration sensor assembly
4 118-9722-00 1 Bias charge roller connector kit with
wiring harness
5 118-9779-00 1 Waste cartridge full sensor
6 118-9780-00 1 Waste cartridge installed sensor
7 118-9781-00 1 Imaging unit connector
152
Phaser 780 Color Printer
Developer FRUs
780-5-126
11
1
2
2
2
3
3
34
4
4
Service Guide
153
Table 8 Developer FRUs
Parts Part number Serial number
Effective Discont’dQty Name and description
1 118-9782-00 1 Developer assembly, Black
2 118-9783-00 1 Developer assembly, Cyan
3 118-9784-00 1 Developer assembly, Magenta
4 118-9785-00 1 Developer assembly, Yellow
116-0073-00 Developer shim kit (1 each of 4 sizes)
154
Phaser 780 Color Printer
Carousel FRUs
4c
4d
5
4b
4a
3
2
1
780-5-127
6
Service Guide
155
Table 9 Carousel FRUs
Parts Part number Serial number
Effective Discont’dQty Name and description
1 118-9787-00 1 Toner cartridge presence sensor
2 118-9724-00 1 Developer contact assembly
3 118-9820-00 1 Carousel knob
4
4a
4b
4c
4d
118-9723-00 1
1
1
1
Carousel assembly kit
Carousel knob
Carousel front bearing
Carousel frame
Carousel rear bearing
5 118-9788-00 1 New toner cartridge sensor
6 118-9786-00 1 Carousel home sensor
156
Phaser 780 Color Printer
Accumulator belt assembly FRUs
5
8d
2b
3
2a
1
67
8a
8b
8c
780-5-128
Service Guide
157
Table 10 Accumulator belt assembly FRUs
Parts Part number Serial number
Effective Discont’dQty Name and description
1 118-9790-00 1 Tension lever
2
2a
2b
118-9726-00 1
1
Belt cleaning assembly kit
Cleaner support assembly
Belt cleaner
3 118-9791-00 1 Second bias transfer roller cam
assembly
5 118-9789-00 1 Accumulator belt assembly
6 118-9793-00 1 Waste auger assembly
7 118-9792-00 1 Transfer roller cam solenoid
8
8a
8b
8c
8d
118-9725-00 1
1
1
1
Second bias transfer roller assembly kit
Second bias transfer bracket
Second bias transfer bearing-6
Second bias transfer bearing-4
Second bias roller transfer assembly
158
Phaser 780 Color Printer
Fuser assembly FRUs
1
2
3
780-5-129
4
Service Guide
159
Table 11 Fuser assembly FRUs
Parts Part number Serial number
Effective Discont’dQty Name and description
1 118-9886-01
118-9887-01 1
1Fuser, 110 VAC
Fuser, 220 VAC
2 016-1866-00 1 Fuser roll cartridge
3 118-9986-00 1 Fuser tray release lever
4 118-9727-00
118-9728-00 1 Fuser assembly 110V
Fuser assembly 220V
160
Phaser 780 Color Printer
Paper exit FRUs
780-5-130
1
2
3
3
3
3
3
Service Guide
161
Table 12 Paper exit FRUs
Parts Part number Serial number
Effective Discont’dQty Name and description
1 118-9798-00 1 Lower exit assembly
2 118-9799-00 1 Upper exit assembly
3 118-9800-00 1 Exit tray assembly
162
Phaser 780 Color Printer
Paper exit FRUs
780-5-131
1c
1c
1f
1b
1a
1a
1a
1a
1a
1a
1a
1a
1d
1e
1b
1e
1b
2
5
4
3
Service Guide
163
Table 13 Paper exit FRUs
Parts Part number Serial number
Effective Discont’dQty Name and description
1
1a
1b
1c
1d
1e
1f
118-9729-00 1 Exit upper roller kit
Exit idler gear
Exit spur gear
Exit rear bearing
Exit-3 roller
Exit front bearing
Exit-2 roller
2 118-9802-00 1 Exit door switch
3 118-9801-00 1 Media exit sensor with flag
4 118-9803-00 1 Fuser fan
5 116-0050-00 1 Full stack sensor
164
Phaser 780 Color Printer
Drive FRUs
780-5-132
1
2
3
46
5
9
8
7a
7d
7c 7c
7b
Service Guide
165
Table 14 Drive FRUs
Parts Part number Serial number
Effective Discont’dQty Name and description
1 118-9804-00 1 Paper feed drive assembly
2 118-9806-00 1 Process drive assembly
3 Process motor (part of process drive
assembly)
4 118-9809-00 1 Carousel motor board
5 118-9810-00 1 Toner/developer dispense motor
6 118-9811-00 1 Developer clutch
7
7a
7b
7c
7d
118-9730-00 Paper feed motor assembly kit
Paper feed motor support
Paper feed motor
Harness clamp
Paper feed bracket
8 118-9805-00 Fuser drive assembly
9 118-9808-00 Carousel motor
166
Phaser 780 Color Printer
Electronic (rear) FRUs
780-5-133
3
1
4
2a
2b
5
A
6
A
Part of Carousel
FRU Part 2
Part of Imaging
FRU Part 4
Service Guide
167
Table 15 Electronic (rear) FRUs
Parts Part number Serial number
Effective Discont’dQty Name and description
1 118-9873-00 1 High voltage power supply board
2
2a
2b
118-9731-00 1
1
Developer fan kit
Developer fan
Developer fan duct
3 118-9816-00 1 Top cover switch
4 118-9817-00 1 Fuser connector, Main
5 119-5871-00
119-5872-00 1
1Low voltage power supply, 110 VAC
Low voltage power supply, 220 VAC
6 118-9819-00 Main harness, DC
168
Phaser 780 Color Printer
Electronics (front) FRUs
780-5-134
2
4
56
3
8
9
7
1
10
Service Guide
169
Table 16 Electronic (front) FRUs
Parts Part number Serial number
Effective Discont’dQty Name and description
1 118-9822-00 1 Front cover switch, right
2 118-9821-00 1 Front cover switch, left
3 118-9815-00 1 Exit connector-8
4 118-9814-00 1 Exit connector -4
5 118-9824-00 1 Video harness
6 118-9825-00 1 Laser unit harness
7 118-9796-00 1 Engine control board
8 118-9823-00 1 Paper feeder harness
9 118-9863-00 1 Environmental sensor
10 163-1283-00 1 Print engine NVRAM chip
170
Phaser 780 Color Printer
Image processor FRUs
780-5-135
1
2
3
6
5
4
7
8
9
12
10 11
Service Guide
171
Table 17 Image processor FRUs
Parts Part number Serial number
Effective Discont’dQty Name and description
1 118-9826-00 1 Image processor fan
2 118-9885-00 1 Front panel harness
3 671-4303-80 1 Image processor board
4 156-4759-00
156-4765-00
156-4780-00
1 RAM DIMM, 32 Mbytes
RAM DIMM, 64 Mbyte
RAM DIMM, 128 Mbyte
5 671-4759-00
671-4687-00
671-4688-00
671-4686-00
1
1
1
1
Font ROM SIMM, Kanji
Font ROM SIMM, Simplified Chinese
Font ROM SIMM, Traditional Chinese
Font ROM SIMM, Korean
6 671-4672-51
671-4673-51 PostScript Code SIMM, Base (v2.86)
PostScript Code SIMM, Graphics and
Plus (v2.86)
7 671-4306-50 SCSI riser board
8 671-3994-00
671-3932-00
671-4034-00
386-6998-00
213-1090-00
1
1
1
1
2
Ethernet 100baseT Network card
TokenRing card
LocalTalk card
Blank panel, net card
Screws, 4-40 x .312
9 119-6032-00 1 CPU Fan
10 650-3886-01 1 Dallas Real Time Clock
11 156-4768-00 1 NVRAM
12 163-1148-00 1 Boot ROM/Product ID
172
Phaser 780 Color Printer
Optional lower feeder cabinet FRUs
780-5-136
7
8
8
88
1
1
2
3
4
56
6
Service Guide
173
Table 18 Optional lower feeder cabinet FRUs
Parts Part number Serial number
Effective Discont’dQty Name and description
1
118-9923-00
1 Lower feeder front cover
2 118-9926-00 1 Lower feeder left cover
3 118-9924-00 1 Lower feeder rear cover
4 118-9925-00 1 Lower feeder harness cover
5 118-9928-00 1 Lower feeder chute assembly
6 118-9929-00 1 Lower feeder chute support
7 118-9927-00 1 Lower feeder right cover
8 118-9930-00 1 Lower feeder caster
174
Phaser 780 Color Printer
Optional Feeder FRUs
1
7
A
B
C7
7
2
4
5
3
1
1
C
B
A
D
D
780-5-137
8
8
6
9
10: Items 1 thru 9
Service Guide
175
Table 19 Optional feeder FRUs
Parts Part number Serial number
Effective Discont’dQty Name and description
1 118-9931-00 1 Lower feeder assembly
2 118-9934-00 1 Lower feeder gear assembly
3 118-9933-00 1 Lower feeder motor
4 118-9936-00 1 Lower feeder interface harness
5 118-9935-00 1 Lower feeder circuit board
6 118-9747-00 Lower feeder paper size sensor
7 118-9932-00 1 Lower feeder turn-in chute
8 118-9985-00 1 Tray spacer
9 118-9802-00 1 Lower feeder chute switch
10 436-0367-00 1 Lower tray assembly (optional feeder)
176
Phaser 780 Color Printer
Supplies and accessories
Table 20 Supplies and accessories
Parts Part number Serial number
Effective Discont’dQty Name and description
016-1678-00 Toner Cartridge, Black
016-1679-00 Toner Cartridge, Cyan
016-1680-00 Toner Cartridge, Magenta
016-1681-00 Toner Cartridge, Yellow
016-1864-00 Imaging Unit Cartridge
016-1865-00 Imaging Unit Waste Cartridge
016-1866-00 Standard Fuser Roll Cartridge
016-1717-00 High Duty Fuser Roll Cartridge
016-1369-00 A4 Size Paper, 500 Sheets
016-1697-00 Tab Plus Glossy, 100#, 50 Sheets
016-1699-00 Plain Paper,24#,b,500 Sheets
016-1700-00 Plain Paper,24#,a3,500 Sheets
016-1701-00 Transparency, A, 50 Sheets
016-1702-00 Transparency, A4, 50 Sheets
016-1703-00 Paper, Image Transfer, B, 100 Sheets
016-1704-00 Paper, Glossy, A, 100#, 100 Sheets
016-1705-00 Paper, Glossy, A4, 100#, 100 Sheets
016-1706-00 Transparency, Tab Extra, 50 Sheets
016-1709-00 Paper, Tab Plus, 24#, 500 Sheets
016-1718-00 Paper, Glossy Coated, B, 100 #, 50
sheets
063-3039-00 CD, ROM, English
063-3039-10 CD, ROM, French
063-3039-20 CD, ROM, Italian
063-3039-30 CD, ROM, German
063-3039-40 CD, ROM, Spanish
063-3039-70 CD, ROM, Simplified Chinese
063-3039-80 CD, ROM, Traditional Chinese
063-3039-90 CD, ROM, Korean
063-3040-00 User Guide, English
063-3040-10 User Guide, French
Service Guide
177
063-3040-20 User Guide, Italian
063-3040-30 User Guide, German
063-3040-40 User Guide, Spanish
063-3040-05 User Guide, Russian
063-3041-00 Quick Reference Guide, Service
063-3094-00 Setup Guide, English
063-3094-10 Setup Guide, French
063-3094-20 Setup Guide, Italian
063-3094-30 Setup Guide, German
063-3094-40 Setup Guide, Spanish
063-3094-05 Setup Guide, Russian
063-3116-00 Phasershare Setup Guide
063-3116-10 Phasershare Setup Guide, French
063-3116-20 Phasershare Setup Guide, Italian
063-3116-30 Phasershare Setup Guide, German
063-3116-40 Phasershare Setup Guide, Spanish
063-3126-00 CD, Adobe Type Manager
063-3181-00 CD, Phaser Match, Color Match
070-9925-00 Advanced Features & Troubleshooting,
English
161-0066-00 Power Cord, 115v
161-0066-09 Power Cord, 220v
161-0066-10 Power Cord, U.K.
161-0066-11 Power Cord, Aust.
161-0154-00 Power Cord, Swiss
161-0240-00 Power Cord, Danish
436-0366-00 Universal Size Paper Tray (Std)
436-0368-00 Labels & Transparency Tray
013-0297-00 Cable, Adapter, SCSI 1 TO SCSI 2
118-9921-00 Hardware Kit
116-0073-00 Developer shim kit (4 sets of 3 sizes)
003-0619-00 I.C. Extractor, SCSI Board removal tool
Table 20 Supplies and accessories
Parts Part number Serial number
Effective Discont’dQty Name and description
178
Phaser 780 Color Printer
003-1633-00 IC PLCC Extractor Tool
065-0574-00 Repackaging Kit
650-3572-01 Rebanding Kit
650-3971-00 Recycle kit for developer assemblies,
California only
003-1496-00
003-1497-00 Vacuum cleaner, 110/115 VAC
Vacuum cleaner, 220/240 VAC
003-1498-00 Vacuum cleaner filter, Type 2, 3M
004-4845-00 Shipping Box
003-0602-00 #1 Pozidrive screwdriver tip
006-7971-00 Imaging unit lightshield
Table 20 Supplies and accessories
Parts Part number Serial number
Effective Discont’dQty Name and description
Service Guide
179
Test Prints
This topic illustrates the test prints produced by the print engine. It also
illustrates a number of defective prints and the reason for the defects. The topic
“Printing and print quality problems” on page 43 discusses solutions to the
problems shown in this appendix.
Consumables Print consists of four 25% tint primary color bands and “gas
gauges” for each consumable. Service Print 1 prints out four 25% tint full page
fills, each page one primary color.
1
2
Service Print 1
Black
Cyan
Magenta
Yellow
3
Replace Magenta Toner Cartridge
Press i for information
Help Pages
Consumable Pages Print
Help Pages
Service Print 1 Print
Toner
Black
Magenta
Cyan
Yellow
Your average coverage/page: 20.0%
Fuser Roll
Imaging Unit
Count (Pages): 1061
Count (Pages): 1061
S/N: 00:00:00:00:00:00
Avg. toner coverage/color: 20%
Date installed: 11/1/98
0% 50% 100%
10 %
Life Remaining
0% 50% 100%
10 %
Life Remaining
Fuser Roll
Imaging Unit
Toner
0% 50% 100%
25 %
Life Remaining
Your average coverage/page: 50.0%
0% 50% 100%
50 %
Life Remaining
Your average coverage/page: 30.0%
0% 50% 100%
75 %
Life Remaining
Your average coverage/page: 40.0%
0% 50% 100%
33 %
Life Remaining
Phaser® 780 Color Printer
Service Print 1
180
Phaser 780 Color Printer
Interpreting Service Print 2
Service print 2 should always be printed on
B-size paper.
1.
Color registration
. The thin lines should
not be above or below the think line.
Preferable they should be centered.
2.
Blur.
The lines should be crisp and
sharp with no “fuzzy” appearance.
3.
Ghosting.
No ghost images of the
square patterns should appear in the
gray bar below the square patterns.
4.
Uniform RGB.
The secondary color
squares should be uniformly colored with
no mottling.
5.
Resolutions
.
The thin lines should be
fully separated from each other
6.
Text
. The text should be sharp with no
discernible voids.
Interpreting Service Print 3
Service print 3 should always be printed on
B-size paper.
1.
Skew
. The difference between the
values measured at each corner of the
leading edge of the print should be no
greater than +/- 2 mm.
2.
Leading edge
. The value measure from
the leading edge to the indicated line
should be 14.9 mm (+/-2 mm).
3.
Side edge.
The value measure from the
side edge to the center should be
148.5 mm (+/-2.5 mm). (When the print
is accurately folded in half lengthwise, the
center line should be in the center of the
crease.)
6
3
4
4
4
4
2
1
4
5
1
LEAD EDGE
TRAIL EDGE
1
2
3
3041-35
Service Guide
181
Interpreting Service Print 4
Service print 2 should always be printed on
B-size paper. The print reveals repeating
defects that can be traced back to defects on
the printers belts, drum or rollers.
1.
Look for repeating defects inline down
the print.
Refer to the topic “Repetitive mark
appears on each print” on page 56. It
discusses caused of repeating spots
based on the distance between the spots.
Interpreting Sevice Print 5: Yellow
Calibration Page
Service print 5 is a 100% yellow solid fill.
Refer to the topic “Printing and print quality
problems” on page 43 for solution to any
print problems detected. Look for voids,
repeating spots and banding. This solid fill is
also useful for flushing out defective yellow
toner.
3041-36
182
Phaser 780 Color Printer
Interpreting Sevice Print 6: Magenta
Calibration Page
Service print 6 is a 100% magenta solid fill.
Refer to the topic “Printing and print quality
problems” on page 43 for solution to any
print problems detected. Look for voids,
repeating spots and banding. This solid fill is
also useful for flushing out defective
magenta toner.
Interpreting Sevice Print 7: Cyan Calibration
Page
Service print 7 is a 100% cyan solid fill.
Refer to the topic “Printing and print quality
problems” on page 43 for solution to any
print problems detected. Look for voids,
repeating spots and banding. This solid fill is
also useful for flushing out defective cyan
toner.
Service Guide
183
Interpreting Sevice Print 8: Black Calibration
Page
Service print 8 is a 100% black solid fill.
Refer to the topic “Printing and print quality
problems” on page 43 for solution to any
print problems detected. Look for voids,
repeating spots and banding. This solid fill is
also useful for flushing out defective black
toner.
Service Print 9: Fuser Cleaning Page
Service print 9 is a blank sheet of paper
used to clean the fuser rollers as well as test
the operation of the paper feed components.
184
Phaser 780 Color Printer
Service Guide
1
Wiring Diagrams
Print engine wiring diagram
EMPTY
LOW VOLTAGE
POWER SUPPLY
RIGHT
LEFT
LASER
SCANNER
3041-09
PAPER FINDER
MUTI-PURPOSE
MUTI-PURPOSE
HIGH VOLTAGE POWER SUPPLY
SECOND
ACCUMULATOR
BELT ASSY
SECOND
TONER
CAROUSEL
TONER
CAROUSEL
CAROUSEL
BTR
CAM SOLENOID
ACCUMULATOR BELT
SENSOR
PAPER FEED
FRONT PANEL
IMAGE
PROCESSOR
IMAGE
PROCESSOR
ENGINE
CONTROL
BOARD
J 79
J 75
J 77
J 72
J 71
J 78
J 73
J 74
J 62
J 18
J 80
J 76J 117
J 19
J 35
J 32 J 33
J 21 J 12
J 19
J 20
J 19
J 20
J 105
J 102
J 103
J 107 J 101
J 106
J 104
J 70 J 97 J 191 J 192 J 193 J 194 J 195 J 196
J 19 J 197
J 13 J 122
J 14 J 121
J 123
J 124
J 17 J 81
J 86
J 18 J 116 J 88
J 83
J 16 J 22
J 84 J 85
J 20
J 93
J 98
J 99
J 95 J 91
J 94
J 94
J 90
J 204 J 92 J 20
J 205
J 206
J 203 J 113
J 201
J 202
J 165 J 161 J 17
J 166
J 167 J 163
J 111 J 19
J 16 J 42 J 41
J 17 J 87
J 161 J 89 J 168
J 58J 19
J 56
J 82
J 18 J 55
J 16 J 245 J 246
J 247
J 19 J 63
J 17 J 57
J 50 J 49
J 52 J 51
J 11 J 310
J 314
J 317
MUTI-PURPOSE
MUTI-PURPOSE
MUTI-PURPOSE
BCR
SECOND
BTRBTR
ASSY
BTR
BOARD
(BTR)
BIAS TRANSFER
ROLLER
(BCR)
BIAS CHARGE
ROLLER
Laser
Scanner
MUTI-PURPOSE
Start of Scan (ADC)
AUTO-DENSITY
CALIBRATION
186
Phaser 780 Color Printer
Plug/Jack Locations - 1
P/J Map & Coordinates Connected to... Other end connected to...
10 Map 2-D205 Engine control board --
11 Map 2-E205 Engine control board Image processor board
12 Map 2-D205 Engine control board Low voltage power supply P/J33
13 Map 2-D205 Engine control board Laser Diode board P/J122
14 Map 2-D204 Engine control board Laser Unit P/J121, P/J123, P/J124
16 Map 2-D204 Engine control board CRUM
17 Map 2-E204 Engine control board Auto-density calibration Sensor P/J81
Erase Lamp P/J86
18 Map 2-E203 Engine control board Waste Toner Sensor P/J88
Toner Box Sensor P/J83
19 Map 2-F203 Engine control board Fuser Assembly P/J71
20 Map 2-F204 Engine control board Paper feeder P/J91
21 Map 2-F204 Engine control board Low voltage power supply P/J32
22 Map 2-C204 Communications Assembly Engine control board P/J18
22A Map 2-C204 P/J22 Engine control board P/J16
32 Map 6-D609 Low voltage power supply Engine control board P/J21
33 Map 6-D610 Low voltage power supply Engine control board P/J12
35 Map 6-G609 Low voltage power supply Fuser Assembly P/J71
41 Map 6-C609 High voltage power supply Low voltage power supply P/J32
42 Map 6-C609 High voltage power supply Engine control board P/J16
49 CN1 Map 6-E609 Paper feed Motor Low voltage power supply P/J32
50 CN2 Map 6-608 Paper feed Motor Engine control board P/J17
Service Guide
1
8
Plug/Jack Locations - 2
P/J Map & Coordinates Connected to... Other end connected to...
CN3 Map 6-E609 Mounted on Paper feed motor board --
CN4 Map 6-E608 Mounted on Paper feed motor board --
51 Map 6-D608 Process Motor Low voltage power supply P/J32
52 Map 6-D607 Process Motor Engine control board P/J17
55 Map 7-E708 Dispense Motor Engine control board P/J18
56 Map 7-F708 Developer Clutch Engine control board P/J19
56A Map 7-F708 P/J56 Engine control board P/J19
57 Map 5-C509 Accumulator belt Sensor Engine control board P/J17
58 Map 7-F708 Carousel Sensor Engine control board P/J19
62 Map 8-E812 Cleaner Cam Solenoid Fuser Tray Assembly P/J71
62A Map 8-E812 Cleaner Cam Solenoid P/J62 Fuser Tray Assembly P/J71
63 Map 7-C710 BTR Cam Solenoid Engine control board P/J19
63A Map 7-C710 P/J63 Engine control board P/J19
68 Map 6-B610 -- Optional high capacity feeder
68A Map 6-B610 P/J68 Option high capacity feeder
69A Map 8-H813 Option high capacity feeder --
69B Map 8-H813 -- Option high capacity feeder
70 Map 7-F711 Fuser Assembly P/J71 Low voltage power supply P/J32
71 Map 7-F710 Fuser Assembly P/J70
71A Map 7-F710 Fuser Tray Assembly P/J71 Engine control board P/J18
72A Map 8-G812 P/J72B Fuser Assembly P/J71
72B Map 8-G812 P/J72A Temperature Sensor Assembly
73 Map 8-I812 Oil Cam Solenoid P/J73A
73A Map 8-I812 P/J73 Oil Cam Solenoid Fuser Tray Assembly P/J71
74 Map 8-I813 Exchange Solenoid P/J74A
188
Phaser 780 Color Printer
Plug/Jack Locations - 3
P/J Map & Coordinates Connected to... Other end connected to...
74A Map 8-I813 P/J74 Fuser tray assembly P/J71
75 Map 8-H807 Fuser exit sensor Fuser assembly P/J72B
76 Map 8-F813 P/J117 fuser entry sensor Fuser assembly P/J76A
76A Map 8-F813 P/J76 Fuser tray assembly P/J71
77 Map 8-G808 CRU switch assembly Fuser assembly P/J77A
77A Map 8-G808 P/J77 Fuser assembly P/J71
78A Map 8-I813 P/J78B Fuser assembly P/J71
78B Map 8-I813 P/J78A Loop
79 Map 8-F812 Pressure roller heat rod Fuser assembly P/J71
80 Map 8-D813 Fuser chute fan Fuser tray assembly P/J80A
80A Map 8-D813 P/J80 Fuser tray assembly P/J71
81 Map 1-C110 Auto-density calibration sensor
assembly P/J81A
81A Map 1-C110 P/J81 Engine control board P/J17
82 Map 6-G608 Developer Fan P/J82A
82A Map 6-G608 P/J82A Engine control board P/J17
83 Map 1-G106 Toner box sensor P/J83A
83A Map 1-G106 P/J83 P/J116
84 Map 1-I107 CRUM assembly P/J85 P/J84A
84A Map 1-I107 P/J84A Engine control board P/J16
85 Map 1-H107 CRUM assembly P/J84
86 Map 1-I105 Erase lamp P/J86A
86A Map 1-I105 P/J86A Engine control board P/J17
87 Map 5-I506 Used cartridge sensor Engine control board P/J17
88 Map 1-F106 Waste toner sensor P/J116
89 Map 8-D805 Cartridge sensor P/J168 P/J89A
89A Map 8-D805 P/J89 P/J161B
Service Guide
1
8
Plug/Jack Locations - 4
P/J Map & Coordinates Connected to... Other end connected to...
90A Map 4-G409 P/J90B Paper feeder P/J91
90B Map 4-G409 P/J90A Loop
91 Map 2-D211
Map 4-E408
Paper feeder Engine control board P/J20
92A Map 4-E409 Multi-purpose tray assembly P/J92B Paper feeder P/J91
92B Map 4-E409 Multi-purpose tray assembly Paper feeder P/J92A
93 Map 4-D408 Registration sensor Paper feeder P/J91
94 Map 4-F408 Registration clutch P/J94A
94A Map 4-F408 P/J94 Paper feeder P/J110B & P/J115
95 Map 4-G408 Pre-Registration clutch P/J95A
95A Map 4-G408 P/J95 Paper feeder P/J110B & P/J115
97 Map 2-F204 Paper feeder P/J 91 Front cover switch R P/J191 & P/J70
98 Map 4-D409 Front OHP sensor Paper feeder P/J91
99 Map 4-E408 Rear OHP sensor Paper feeder P/J91
101 Map 2-D212 Tray no paper sensor P/J107 P/J101A
101A Map 2-D212 P/J101 Engine control board P/J20
102 Map 7-D711 Size Switch assembly Engine control board P/J19
103A Map 2-F206 P./J103B Engine control board P/J19
103B Map 2-F206 Feed solenoid P/J103A
104 Map 2-D212 P/J104A Terminated
104A Map 2-D212 P/J104 Engine control board P/J20
105 Map 2-D205 Environment sensor P/J105A
105A Map 2-D205 P/J105 Engine control board P/J20
106 Map 2-E211 Low Paper sensor P/J106A
106A Map 2-E211 P/J106 Engine control board P/J20
190
Phaser 780 Color Printer
Plug/Jack Locations - 5
P/J Map & Coordinates Connected to... Other end connected to...
107 Map 2-E213 Tray no paper sensor P/J 101
109 Map 4-D409 Registration brake clutch P/J109A
109A Map 4-D409 P/J109 Paper feeder P/J91
110A Map 4-G408 P/J110B Paper feeder P/J91
110B Map 4-G408 P/J94A, P/J95A, & P/J115 P/J110A
111A Map 7-G70
Map 8-D805
P/J111B Engine control board P/J17
111B Map 8-D806 P/J111A Fuser Fan
113A Map 4-E409 Multi-purpose tray assembly P/J113B Paper feeder P/J91
113B Map 4-E409 P/J113A Multi-purpose tray short no paper sensor P/J203
Multi-purpose tray clutch P/J202A-P/J202B
Pick up solenoid P/J201A-P/J202B
115 Map 4-H408 P/J94A & P/J95A Terminated
116 Map 1-H106 P/J83A
Waste toner sensor P/J88
P/J116A
116A Map 1-H106 P/J116 Engine control board P/J18
117 Map 5-D507 Fuser In Sensor P/J76
121 Map 5-D507 Laser diode assembly Engine control board P/J14
P/J196
122 Map 5-D506 Laser diode assembly Engine control board P/J13
123 Map 5-E506 Laser unit Engine control board P/J14
124 Map 5-C506 Star-of-scan sensor Engine control board P/J14
131 Map 6-B610 Option connection not on schematic
131A Map 6-B610 Option connection not on schematic
132 Map 6-B610 Option connection not on schematic
132A Map 6-B610 Option connection not on schematic
161A Map 7-G707
Map 8-D805
P/J161B Engine control board P/J17
Service Guide
1
9
Plug/Jack Locations - 6
P/J Map & Coordinates Connected to... Other end connected to...
161B Map 8-D805 P/J161A Top Exit sensor P/J165
Exit Chute switch P/J166
163A Map 7-G707
Map 8-D805
P/J163B Engine control board P/J17
163B Map 8-D805 P/J163A Full Stack sensor P/J167
165 Map 8-F804 Top exit sensor P/J161B
166 Map 8-E804 Exit chute switch P/J161B
167 Map 8-G802 Full stack sensor P/J163B
168 Map 8-J802 Cartridge sensor P/J89
191 Map 1-E109 Right front cover switch P/J97
192 Map 1-E109 Right front cover switch P/J33
193 Map 1-E109 Right front cover switch P/J33
194 Map 1-E109 Right front cover switch P/J195
195 Map 6-H607 Top cover switch P/J195A
195A Map 6-H607 P/J195 P/J194
P/J196
196 Map 2-F203 Laser diode assembly P/J121 P/J195
Low voltage power supply P/J33
197 Map 5-H506 Left front cover switch P/J197A
197A Map 5-H506 P/J197 Engine control board P/J19
201A Map 4-I408 P/J201B Multi-purpose tray assembly P/J113B
201B Map 4-I408 Pick-up solenoid P/J201A
202A Map 4-H408 P/J202B Multi-purpose tray assembly P/J113B
202B Map 4-H408 Multi-purpose tray pick-up solenoid P/J201A
203 Map 4-G409 Multi-purpose tray short no paper
sensor Multi-purpose tray assembly P/J 113B
204 Map 4-G408 Multi-purpose tray edge sensor Multi-purpose tray assembly P/J92B
P/J207
205 Map 4-H409 Multi-purpose tray OHP sensor Multi-purpose tray assembly P/J92B
P/J207
192
Phaser 780 Color Printer
Plug/Jack Locations - 7
P/J Map & Coordinates Connected to ... Other end connected to ...
206 Map 4-G409 Multi-purpose tray long no paper
sensor Multi-purpose tray Assembly P/J92B
P/J207
207 Map 4-F409 Multi-purpose tray assembly P/J92B P/J204
P/J205
P/J206
245 Map 6-F608 Carousel motor board Engine control board P/J16
246 Map 6-F607 Carousel motor board Low voltage power supply P/J32
247 Map 6-E607 Carousel motor board Carousel Motor
F421 Map 5-D508 Bias charge roller connector High voltage power supply P/J-A
F422 Map 1-B108 Developer contact assembly High voltage power supply P/J-C
F423 Map 5-D511 DTS Plate High voltage power supply P/J-G
F791 Map 8-F807 Pressure roller heat rod Heat roller heat rod
A Map 6-B606 High voltage power supply P/J F421
C Map 6-C607 High voltage power supply P/J F422
D Map 6-B609 High voltage power supply First bias transfer roller bias plate
F Map 6-B608 High voltage power supply Second bias transfer roller contact plate
G Map 6-B608 High voltage power supply P/J F423
T1 Map 8-G811 Heat roller heat rod
T2 Map 8-I806 Pressure roller heat rod
T3 Map 5-D510 First bias transfer roller bias plate
T4 Map 5-E510 Second bias transfer roller contact
plate
T5 Map 8-I806 Not on schematic
310 Map 3-F306 Image processor board Front panel P/J317
314 Map 3-G306 Image processor board Image processor fan
317 Map 3-C306 Front panel Image processor board P/J314
Service Guide
1
9
The following illustrations detail the proper means of routing and dressing printer wiring. Incorrect wiring dressing can result in wires pinched by cabinet panels or damage
d
by moving parts of the printer.
Map 1 – Wiring routing at the top and front of the printer
88
F422
81, 81A
192
194
193
191
84, 84A
85
86, 86A
83, 83A
116, 116A
3041-10
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
ABCDEFGHI J KL
194
Phaser 780 Color Printer
Map 2 – Wire routing around the engine control board
3041-11
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
ABCDEFGHI J KL
14 16 17 18
20
21
11
105, 105A
103, 103A
106, 106A
101, 101A
104, 104A
13
12
10
91
107
97
196
19
22, 22A
Service Guide
1
9
Map 3 – Wiring routing around the image processor board
3041-12
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
ABCDEFGHI J KL
317 310
310
196
Phaser 780 Color Printer
.
Map 4 – Wiring routing around the paper feeder
98 99
207 203
206
205
109, 109A
113A, 113B
92A, 92B 90A, 90B
202A, 202B
201A, 201B
93
115
204
95, 95A
94, 94A
110A, 110B
91
3041-13
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
ABCDEFGHI J KL
Service Guide
1
9
Map 5 – Wire routing around the laser scanner and high voltage power supply
197, 197A
F421
124 122 121 123
87
F423 T4
T3
57
3041-14
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
ABCDEFGHI J KL
198
Phaser 780 Color Printer
Map 6 – Wire routing at the rear of the printer
3041-15
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
ABCDEFGHI J KL
42
D
F
G
A
C
51 52
247 246 245 195, 195A
82, 82A
103A
68,
68A
132, 132A
131, 131A
41
33
32
35
(CN4)
49(CN1)
(CN3)
50(CN2)
Service Guide
1
9
Map 7 – Wire routing around the power supply
3041-16
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
63, 63A
102 35
70
71, 71A
56.56A
ABCDEFGHI J KL
55
58
161A
163A
111A
200
Phaser 780 Color Printer
Map 8 – Wire routing around the fuser
111A,
111B T1
62, 62A
80, 80A
79
72A, 72B
76, 76A 69A,
69B
78A,
78B
74,
74A
73,
73A
77, 77A
71
F791
75
T2
T5
117
168
165
166
89,
89A
161A, 161B
163A,
163B
3041-17
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
ABCDEFGHI J KL
Service Guide
2
0
Wiring 1 – Low voltage power supply, laser unit, and interlock switches
3041-19
ENGINE
CONTROL
BOARD
LOW VOLTAGE POWER SUPPLY
PAPER FEEDER
LASER UNIT
13
14
15
202
Phaser 780 Color Printer
Wiring 2 – Engine control board, auto-density calibration sensor, erase lamp, waste toner sensor
3041-20
Service Guide
2
0
Wiring 3 – Low voltage power supply, engine control board, high-voltage power supply and imaging components
3041-21
ENGINE
CONTROL
BOARD
HIGH VOLTAGE POWER SUPPLY
7
6
BIAS
CHARGE
ROLLER
CONNECTOR
ASSY
FIRST
BIAS TRANSFER
ROLLER
BIAS PLATE
FIRST
BIAS
TRANSFER
ROLLER
ACCUMULATOR BELT ASSY
LOW
VOLTAGE
POWER
SUPPLY
DEVELOPER ASSY
SECOND
BIAS
TRANSFER
ROLLER
ASSY
SECOND
BIAS
TRANSFER
ROLLER
2ND BIAS TRANSFER
ROLLER CAM ASSY
204
Phaser 780 Color Printer
Wiring 4 – Engine control board, used cartridge sensor, cartridge sensor, carousel sensor, developer clutch, developer fan, toner dispense motor
3041-22
ENGINE CONTROL
BOARD
CAROUSEL SENSOR
TONER DISPENSE
MOTOR ASSY
TONER DISPENSE MOTOR ON(L) 24VDC
CAROUSEL HOME SENSED(H) 5VDC
Service Guide
2
0
Wiring 5 – Engine control board, low voltage power supply, carousel motor board, rotary motor
3041-23
ENGINE
CONTROL
BOARD
CAROUSEL MOTOR
BOARD CAROUSEL MOTOR
ASSY
LOW VOLTAGE
POWER SUPPLY
CAROUSEL MOTOR HOLD (L) 5VDC
CAROUSEL MOTOR ON (L) 5VDC
CAROUSEL MOTOR CLOCK
206
Phaser 780 Color Printer
Wiring 6 – Engine control board, low voltage power supply, bias transfer roller cam solenoid accumulator belt sensor, paper feeder motor, process motor
3041-24
ENGINE
CONTROL
BOARD BIAS TRANSFER ROLLER
CAM SOLENOID
ACCUMULATOR SENSOR
PAPER FEEDER
LOW VOLTAGE
POWER SUPPLY
Service Guide
2
0
Wiring 7 – Engine control board, low voltage power supply, fuser, oil roll assembly
3041-25
LOW VOLTAGE POWER SUPPLY
PRESSURE
ROLLER HEAT ROLLER
ENGINE
CONTROL
BOARD
208
Phaser 780 Color Printer
Wiring 8 – Engine control board, fuser assembly, environment sensor
3041-26
ENGINE
CONTROL
BOARD
Service Guide
2
0
Wiring 9 – Engine control board, paper size switch board, feed solenoid, no paper sensor, low paper sensor
3041-27
ENGINE
CONTROL
BOARD
PAPER SIZE SWITCH
ASSY
210
Phaser 780 Color Printer
Wiring 10 – Engine control board, paper feeder
3041-28
ENGINE CONTROL
BOARD PAPER FEEDER
FRONT
TRANSPARENCY
SENSOR
REAR
TRANSPARENCY
SENSOR
Service Guide
2
1
Wiring 11 – Engine control board, paper feeder, multi-purpose tray
3041-29
ENGINE CONTROL
BOARD
MULTI-PURPOSE TRAY
MULTI-PURPOSE
TRAY EDGE SENSOR
MULTI-PURPOSE
TRAY OHP SENSOR
MULTI-PURPOSE TRAY
LONG N/P SENSOR
MULTI-PURPOSE TRAY
SHORT N/P SENSOR
MULTI-PURPOSE
TRAY CLUTCH
MULTI-PURPOSE
TRAY PICK UP
SOLENOID
PAPER FEEDER
MULTI-PURPOSE TRAY
EDGE PAPER SENSED (L) 5VDC
MULTI-PURPOSE TRAY OHP SENSED (L) 5VDC
MULTI-PURPOSE TRAY
LONG PAPER SENSED (L) 5VDC
MULTI-PURPOSE TRAY
SHORT PAPER SENSED (L) 5VDC
MULTI-PURPOSE TRAY
CLUTCH ON (L) 24VDC
212
Phaser 780 Color Printer
Wiring 12 – Engine control board, top exit sensor, media exit switch, full stack sensor, fuser fan
3041-30
ENGINE CONTROL
BOARD
MEDIA EXIT SWITCH ON (L) 5VDC
Service Guide
2
1
Wiring 13 – Engine control board, image processor board, front panel, image processor fan
3041-31
ENGINE CONTROL BOARD IMAGE PROCESSOR
BOARD IMAGE PROCESSOR FAN
FRONT PANEL
214
Phaser 780 Color Printer
Wiring 14 – Lower Tray Assembly master wiring diagram
3041-59
BOARD 2BOARD 1
BOARD 4 BOARD 3
Service Guide
2
1
Wiring 15 – Engine control board and low voltage power supply to Lower Tray Assembly feeder board
3041-60
216
Phaser 780 Color Printer
Wiring 16 – Lower Tray Assembly feeder board to feeder chute switch, size switches and feeder motor
3041-61
Service Guide
2
1
Wiring 17 – Lower Tray Assembly feeder board to no paper sensors and low paper sensors
3041-62
218
Phaser 780 Color Printer
Wiring 18 – Lower Tray Assembly feeder board to feed solenoids and turn chutes
3041-63
Service Guide
2
1
220
Phaser 780 Color Printer

Navigation menu