Bixolon Receipt Printer Srp 270 Users Manual 270_SVC_Rev_3_02

srp270 54f11dc6-14b4-41e3-8d3b-3e06395c9d51 BIXOLON Printer SRP-270 User Guide |

2015-02-02

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Service Manual

SRP-270
Impact Printer
Rev. 3.02

http://www.samsungminiprinters.com

SRP-270
■ Table of Contents
1. Precaution Segment .................................................................................................................................... 6
1-1 Safety Precautions................................................................................................................................... 6
1-2 Servicing Precaution................................................................................................................................ 7
1-3 Precaution for Electrostatically Sensitive Devices (ESDs) ...................................................................... 8
2. Installation and Operation .......................................................................................................................... 9
2-1 Installation................................................................................................................................................ 9
2-1-1 AC Adapter Installation ..................................................................................................................... 9
2-1-2 Interface Cable Installation ............................................................................................................... 9
2-1-3 Cash Drawer Cable Installation ........................................................................................................ 9
2-1-4 Ribbon Cartridge Installation............................................................................................................. 9
2-1-5 Paper Roll Installation ..................................................................................................................... 10
2-2 Operation ............................................................................................................................................... 11
2-2-1 Setting the DIP switches ................................................................................................................. 11
2-2-2 Setting the DIP switch (RS-232C Serial Interface) ......................................................................... 11
2-2-3 Setting the DIP switch (IEEE1284 Parallel, USB Interface) ........................................................... 12
2-2-4 Hexadecimal Dumping.................................................................................................................... 13
2-2-5 The self Test Mode ......................................................................................................................... 13
3. Product Specifications.............................................................................................................................. 16
3-1 Appearance............................................................................................................................................ 16
3-1-1 Printer Dimensions (mm) ................................................................................................................ 16
3-1-2 AC Adapter Dimensions (mm) ........................................................................................................ 16
3-1-3 Feature Locations ........................................................................................................................... 17
3-2 General Specifications........................................................................................................................... 18
3-3 Printer Mecha Specifications ................................................................................................................. 18
3-3-1 Printer Mecha Specification ............................................................................................................ 18
3-3-2 Character Specification................................................................................................................... 19
3-3-3 Printer (SMP-710/SMP-710N) Pin Description ...............................................................................19
3-3-4 Printer Head Specification .............................................................................................................. 20
3-3-5 Printer Head Thermistor Specification ............................................................................................ 20
3-3-6 Feed & Carriage Motor Specification.............................................................................................. 20
3-3-7 Auto cutter specification.................................................................................................................. 20
3-3-8 Paper Specification ......................................................................................................................... 20
3-3-9 Ribbon Cassette Specification ........................................................................................................ 21
3-3-10 Other Component Specification .................................................................................................... 21
3-4 SMPS Specifications ............................................................................................................................. 21
3-4-1 SMPS (Switching Mode Power Supply) Specification .................................................................... 21
3-4-2 SMPS Output Connector ................................................................................................................ 21
3-5 Interface Specifications.......................................................................................................................... 22
3-5-1 RS-232C Serial Interface ................................................................................................................ 22
3-5-2 RS-485 Serial Interface................................................................................................................... 24
3-5-3 IEEE1284 Parallel Interface............................................................................................................ 25
3-5-4 USB2.0 Interface............................................................................................................................. 27
3-6 Cash Drawer Specifications................................................................................................................... 28
3-6-1 Cash Drawer Cable......................................................................................................................... 28
3-6-2 Cable Connection ........................................................................................................................... 28

Rev. 3.02

-2-

SRP-270
4. Hardware .................................................................................................................................................... 29
4-1 Wiring Diagram ...................................................................................................................................... 29
4-2 Block Diagram........................................................................................................................................ 30
4-3 Special Circuit Descriptions ................................................................................................................... 31
4-3-1 Power Circuit................................................................................................................................... 31
4-3-2 RESET Circuit ................................................................................................................................. 32
4-3-3 Cash Drawer Circuits ...................................................................................................................... 33
4-3-4 I/F PBA Detect Block Diagram........................................................................................................ 34
4-3-5 RS-232C Communication Block Diagram....................................................................................... 35
4-3-6 RS-485 Communication Block Diagram ......................................................................................... 36
4-3-7 Parallel Communication Block Diagram ......................................................................................... 37
4-3-8 USB Communication Block Diagram .............................................................................................. 37
4-3-9 DIP Switch Circuit ........................................................................................................................... 38
5. Disassembly and Assembly ..................................................................................................................... 39
5-1 General Precautions on Disassembly.................................................................................................... 39
5-2 Plate Bottom .......................................................................................................................................... 39
5-3 Cover Assy (SRP-270D Type)............................................................................................................... 40
5-4 Cover Assy (SRP-270A & SRP-270C Type) ......................................................................................... 40
5-5 Case Upper Assy (SRP-270A & SRP-270C Type)................................................................................41
5-6 Case Upper Assy (SRP-270D Type) ..................................................................................................... 42
5-7 Printer Assy (SRP-270A & SRP-270C Type) ........................................................................................ 42
5-8 Printer Assy (SRP-270D Type).............................................................................................................. 43
5-9 Auto Cutter Assy .................................................................................................................................... 43
5-10 Main PCB............................................................................................................................................. 44
5-11 Interface Board Assy ........................................................................................................................... 44
6. Alignment and Adjustments..................................................................................................................... 45
6-1 Printer Adjustment ................................................................................................................................. 45
7. Troubleshooting ........................................................................................................................................ 46
7-1 Power Problem ...................................................................................................................................... 46
7-2 System Problem..................................................................................................................................... 46
7-3 Printer Problem ...................................................................................................................................... 46
7-4 Cash Drawer Problem ........................................................................................................................... 46
7-5 DIP S/W Problem................................................................................................................................... 46
7-6 RS232 Problem...................................................................................................................................... 46
7-7 RS485 Problem...................................................................................................................................... 46
7-8 IEEE 1284 Problem ............................................................................................................................... 47
7-9 USB Problem ......................................................................................................................................... 47
8. Appendix (Spec of SMP-710/710N) .......................................................................................................... 48
8-1 Specifications......................................................................................................................................... 48
8-1-1 Printing specifications ..................................................................................................................... 48
8-1-2 Character specifications.................................................................................................................. 49
8-1-3 Paper specifications........................................................................................................................ 50
8-1-4 Ribbon Cassette specifications....................................................................................................... 50
8-1-4 Ribbon Cassette specifications....................................................................................................... 51
8-1-5 Environmental specifications .......................................................................................................... 51
8-1-6 Reliability......................................................................................................................................... 52
8-1-7 Main Unit specifications .................................................................................................................. 52
8-1-8 Electrical specifications................................................................................................................... 53
8-1-9 Mechanisms specifications ............................................................................................................. 53
8-1-10 Principle of Movement .................................................................................................................. 54

Rev. 3.02

-3-

SRP-270
8-2 Handling the Printer ............................................................................................................................... 61
8-2-1 Precautions on Printer Handling ..................................................................................................... 61
8-2-2 Paper Setting Procedures (Insertion/Removal) .............................................................................. 62
8-2-3 Ribbon Cassette Installation ........................................................................................................... 64
8-3 Maintenance .......................................................................................................................................... 65
8-3-1 Cleaning .......................................................................................................................................... 65
8-3-2 Inspection........................................................................................................................................ 65
8-4 Lubricants and Adhesive Application..................................................................................................... 66
8-4-1 Lubricant Requirements.................................................................................................................. 66
8-4-2 Lubricant Types .............................................................................................................................. 66
8-4-3 Lubrication Points ........................................................................................................................... 66
8-4-4 Adhesive Application Requirements ............................................................................................... 66
8-4-5 Adhesive types................................................................................................................................ 66
8-4-6 Adhesive Application Points............................................................................................................ 66
8-5 Tools, Lubricants and Adhesives........................................................................................................... 67
8-5-1 List of Tools..................................................................................................................................... 67
8-5-2 List of Lubricants and Adhesives .................................................................................................... 67
8-6 Repair .................................................................................................................................................... 67
8-6-1 Repair Levels .................................................................................................................................. 67
8-6-2 Repair Procedures .......................................................................................................................... 67
8-6-3 Repair Guidelines ........................................................................................................................... 68
8-6-4 Assignment Connector Pin ............................................................................................................. 73
8-7 Disassembly........................................................................................................................................... 74
8-8 Assembly ............................................................................................................................................... 74
8-8-1 Sub-assemblies .............................................................................................................................. 75
8-8-2 Main-assemblies ............................................................................................................................. 78
8-8-3 Adjustment ...................................................................................................................................... 85

Rev. 3.02

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SRP-270

■ About
About this Manual
This Service Manual describes how to perform hardware service maintenance for the BIXOLON SRP-270
Receipt Printer.

Notes
Notes may appear anywhere in the manual. They draw your attention to additional information about the item.

Precaution symbols
Indicates a Safety Precaution that applies to this part component.
Indicates the part or component is an electro-statically sensitive device. Use caution when handling
these parts.

Copyright
ⓒ 2008 by BIXOLON Co., Ltd. All right reserved.
This Manual may not, in whole or in part, be copied, photocopied, reproduced, translated or converted to any
electronic or machine readable from without prior written permission or BIXOLON Co., Ltd.

■ Overview of this Receipt Printer
This System Receipt Printer is a microprocessor-based system, using a 16 bit-microprocessor.
This Service Manual provides the technical information for many individual component systems, circuits and
gives an analysis of the operations performed by the circuits. If you need more technical information, please
contact our service branch or R&D center. Schematics and specifications provide the needed information for
the accurate troubleshooting.
All information in this manual is subject to change without prior notice. Therefore, you must check the
correspondence of your manual with your machine. No part of this manual may be copied or reproduced in
any form or by any means, without the prior written consent of BIXOLON Co., Ltd.

Rev. 3.02

-5-

SRP-270

1. Precaution Segment
Follow these safety, servicing and ESD precautions to prevent damage and to protect against potential
hazards such as electrical shock.

1-1 Safety Precautions
1. Be sure that all of the built-in protective devices are replaced. Restore any missing protective shields.
2. When reinstalling the chassis and its assemblies, be sure to restore all protective devices, including
nonmetallic control knobs and compartment covers.
3. Make sure that there are no cabinet openings through which people - particularly children - might
insert fingers and contact dangerous voltages. Such openings include excessively wide cabinet
ventilation slots and improperly fitted covers and drawers.
4. Leakage Current Hot Check:
WARING: Do not use an isolation transformer during this test.
Use a leakage-current tester or a metering system that complies with American National Standards
Institute (ANSI C101.1, Leakage Current for Applications), and Underwriters Laboratories (UL Publications
UL1410, 59.7)
With the unit completely reassembled, plug the AC line cord directly into a 100VAC or 240VAC outlet of the
Adaptor.
With the unit’s AC switch first in the ON position and then OFF, measure the current between a
known Earth ground (metal water pipe, conduit, etc.) and all exposed metal part, including: metal cabinet,
frame, and screw-heads and printer. The current measure should not exceed 0.1 milliamp. Reverse the
power-plug prong in the AC outlet and repeat the test.
5. Design Alteration Warning:
Never alter or add to the mechanical or electrical design of the Receipt Printer. Unauthorized alterations
might create a safety hazard. Also any design changes or additions will void the manufacture’s warranty.
6. Components, parts and wiring that appear to have overhead or that are otherwise damaged should be
replaced with parts that meet the original specifications. Always determine the cause of damaged or
overheating and correct any potential hazards.
7. Observe the original lead dress, especially near the following areas: sharp edges, and especially the AC
and high voltage supplies. Always inspect for pinched, out-of-place, or frayed wiring.
Do not change the spacing between components and the printed circuit board. Check the AC power cord
for damage. Make sure that leads and components do not touch thermally hot parts.
8. Product Safety Notice:
Some electrical and mechanical parts have special safety-related characteristics, which might not be
obvious from visual inspection. These safety features and the protection they give might be lost if the
replacement component differs from the original-even if the replacement is rated for higher voltage,
wattage, etc.
Components that are critical for safety are indicated in the circuit diagram by shading,
(
)or (
). Use replacement components that have the same ratings, especially for flame resistance
and dielectric strength specifications. A replacement part that does not have the same safety
characteristics as the original might create shock, fire or other hazards.

Rev. 3.02

-6-

SRP-270
1-2 Servicing Precaution
WARNING 1: First read the Safety Precaution section of this manual. If some unforeseen
circumstance creates a conflict between the servicing and safety precautions,
always follow the safety precaution.
WARNING 2: An electrolytic capacitor installed with the wrong polarity might explode.
1. Always unplug the unit’s AC power cord from the AC power source or the Power Switch off before
attempting to:
(a) Remove or reinstall any component or assembly,
(b) Disconnect an electrical plug or connector,
(c) Connect a test component in parallel with an electrolytic capacitor.
2. Some components are raised above the printed circuit board for safety.
An insulation tube or tape is sometime used. The internal wiring is sometimes clamped to prevent contact
with thermally hot components. Reinstall all such elements to their original position.
3. After servicing, always check that the screws, components and wiring have been correctly reinstalled.
Make sure that the portion around the serviced part has not been damaged.
4. Check the insulation between the blades of the AC plug and accessible conductive parts.
(example: metal panels and input terminals).
5. Insulation Checking Procedure:
Disconnect the power cord from the AC source and turn the power switch ON. Connect an insulation
resistance meter (500V) to the blades of the AC plug. The insulation resistance between each blade of the
AC plug and accessible conductive parts (see above) should be greater than 1 mega-ohm.
6. Never defeat any of the B+ voltage interlock. Do not apply AC power to the unit (or any of its assemblies)
unless all solid-state heat sinks are correctly installed.
7. Always connect an instrument’s ground lead to the instrument chassis ground before connecting the
positive lead; always remove the instrument’s ground lead last.

Rev. 3.02

-7-

SRP-270
1-3 Precaution for Electrostatically Sensitive Devices (ESDs)
1. Some semiconductor (solid state) devices are easily damaged by static electricity. Such components are
called Electrostatically Sensitive Devices (ESDs); examples include integrated circuits and some fieldeffect transistors. The following techniques will reduce the occurrence of component damaged caused by
static electricity.
2. Immediately before handling any semiconductor components or assemblies, drain the electrostatic charge
from your body by touching a known earth ground. Alternatively, wear a discharging wrist-strap device.
(Be sure to remove it prior to applying power-this is an Electric shock precaution.)
3. After removing an ESD-equipped assembly, place it on a conductive surface such as aluminum foil to
prevent accumulation of electrostatic charge.
4. Do not use freon-propelled chemical. These can generate electrical charges that damage ESDs.
5. Use only a grounded-tip soldering iron when soldering or unsoldering ESDs.
6. Use only an anti-static solder removal device. Many solder removal devices are not rated as anti-static;
these can accumulate sufficient electrical charge to damage ESDs.
7. Do not remove a replacement ESD from its protective package until you are ready to install it.
Most replacement ESDs are packaged with leads that are electrically shorted together by conductive foam,
aluminum foil or other conductive materials.
8. Immediately before removing the protective material from the leads of a replacement ESD, touch the
protective material to the device will be installed.
9. Minimize body motions when handling unpacked replacement ESDs. Motions such as brushing clothes
together, or lifting a foot from a carpeted floor can generate enough static electricity to damaged an ESD.

Rev. 3.02

-8-

SRP-270

2. Installation and Operation
2-1 Installation
2-1-1 AC Adapter Installation

2-1-2 Interface Cable Installation

1. Mack sure the printer is turned off with the “Off”
side of the switch is pressed down.
2. Check the label on the AC Adapter to make sure the
voltage required by the AC Adapter matches that of the
electrical outlet.
3. Plug the DC cord connector into the power jack on the
printer.
4. Plug the AC Adapter power cord into the wall outlet.

1. Turn off the printer, host ECR and Computer.
2. Plug RS-232, RS-485, USB or Parallel Cable
connector into the I/F connector on the printer.
3. Tighten the screws on both sides of the connector.
4. Turn on the printer, host ECR and Computer.

2-1-3 Cash Drawer Cable Installation

2-1-4 Ribbon Cartridge Installation

Cash Drawer Connector

Cash Drawer Cable

1. Turn the printer off.
2. Plug the Cash Drawer cable connector into the
connector on the printer. (To remove the Cash Drawer
cable, press the clip on the connector, grasp the
connector and pull it out.)
3. Secure the Shield Wire on the bottom of the printer.\

Rev. 3.02

1. Before inserting the ribbon cartridge, turn the Knob.
2. Insert the ribbon cartridge. Pay particular attention to
the placement of the ribbon behind the Print Head.
3. After inserting the ribbon cartridge, turn the knob
clockwise again to make sure the ribbon moves freely
in the cartridge.

-9-

SRP-270
2-1-5 Paper Roll Installation
6. If the paper is loose, wind the Rewind Spindle to tighten
the paper.

1. Using a new roll paper, unroll the paper and cut the end
as shown.

7. Release the holder after fitting the Roll Paper Core onto
the Holder. Make sure to load the paper roll so that it
rotates in the correct direction.

2. In case of Model 270C/D, open Auto Cutter on the
power ON.
3. Auto feeding one paper.
4. Put first paper into Auto Cutter, set second paper rolling
Spool Winding to Lower Case.
5. Setting Auto Cutter, then put first paper to the middle of
guide for cover Printer and pull it out close cover.

Rev. 3.02

- 10 -

SRP-270
2-2 Operation
2-2-1 Setting the DIP switches
The DIP switches are located on the bottom of the printer. The DIP switches are used to set the printer to perform various
functions. Follow these when changing DIP switches setting :
1.
2.
3.

Turn the printer power switch off.
Remove the screw on the bottom of the printer and
open the bracket.
Flip the DIP switches using tweezers or another narrowended tool. Switches are on when up and off when off
down.
The new setting takes effect when you turn on the
printer.

※ Note : Always change DIP switch settings only when the
printer is turned off. Change made with the power
on have no effect and then on again.

2-2-2 Setting the DIP switch (RS-232C Serial Interface)
• DIP Switch 1
SW
1
2
3
4
5
6
7
8

FUNCTION

Emulation Selection

OFF

Refer to the following Table 1

Auto-Cutter
FONT SPACE

Enable
2

Disable
3

Korean Type Selection

Unified

Complete

• DIP Switch 2
SW

FUNCTION

Auto Line Feed

2
3
4
5
6
7
8

Hexadecimal dump
Hand Shaking
Word length
Parity check
Parity selection

ON
Always
Enabled
YES
XON/OFF
7 bits
Enable
EVEN

OFF
Always
Disabled
NO
DTR/DSR
8 bits
Disable
ODD

Function for Service Engineer

Baud Rate selection

Refer to the following Table 2

※ NOTE
When the word length is 7 bits, you can not parity check OFF status.

Rev. 3.02

- 11 -

DEFAULT
OFF
OFF
OFF
OFF
OFF
OFF
DEFAULT
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF

SRP-270
2-2-3 Setting the DIP switch (IEEE1284 Parallel, USB Interface)
• DIP Switch 1
SW
1
2
3
4
5
6
7
8
• DIP Switch 2
SW
1

FUNCTION
Emulation Selection

OFF

Refer to the following Table 1

Auto-Cutter
FONT SPACE

Enable
2

Disable
3

Korean Type Selection

Unified

Complete

FUNCTION

ON
Always
Enabled
YES
-

OFF
Always
Disabled
NO
-

Function for Service Engineer

Auto Line Feed

2
3
4
5
6
7
8

Hex Dump
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved

• Table 1 – Emulation Selection
SW – 1
OFF
OFF
ON
• Table 2 – Baud rate (bps) Selection
Transmission speed
19200 baud
2400 baud
4800 baud
9600 baud

Rev. 3.02

SW – 2
OFF
ON
OFF

MODE
Epson
Citizen
Star

SW – 7
ON
OFF
ON
OFF

SW – 8
ON
ON
OFF
OFF

- 12 -

DEFAULT
OFF
OFF
OFF
OFF
OFF
OFF
DEFAULT
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF

SRP-270
2-2-4 Hexadecimal Dumping
This feature allows experienced users to see exactly what data is coming to the printer. This can be useful in
finding software problems. When you turn on the hexadecimal dump function, the printer prints all commands
and data in hexadecimal format along with a guide section the help you find specification commands.
To use hexadecimal dump mode, please follow these steps:
1. After you make sure that the printer is off.
2. Set DIP-switch 2-2to ON.
3. Turn on the printer, and then the printer enters the hexadecimal dump mode.
4. Run any software program to send data to the printer. The printer will print all the codes it receives in a
two-column format. The first column contains the hexadecimal codes and the second column gives the
ASCII characters corresponding to the codes.
1 B
02
00

2 1
0D
01

0 0
1B
0A

1 B 2 6
44 OA
41 OD

0 2
14
42

4 0
1E
OA

4 0
28
43

. ! . . & . @ @
. . . D . . . (
. . . A . B . C .

Note 1 : A period(.)is printed for each code that no ASCII equivalent.
Note 2 : During the hex dump all the commands except DLE EOT and DLE ENQ are disabled.
5. When the printing finishes, turn off the printer, and change DIP-switch 2-2 to OFF.
6. Turn on the printer and then the hexadecimal mode is off.

2-2-5 The self Test Mode
The self-test checks whether the printer has any problem. If the printer does not function properly, contact
your dealer. The self-test checks the following.
1. Make sure paper roll has been installed properly.
2. Turn on the printer power while holding down the FEED button so that the self-test begins.
3. The self-test prints the current printer status, which provides the control ROM version and the DIP switch
setting.
4. After printing the current printer status self-test printing will print the following and pause.
(The PAPER OUT and ERROR LED’s light blinks.)
Please press the button
5. Press the FEED button to continue printing. The printer prints a pattern using the built-in character set.
6. The character test sheet to be printed is that four lines are printed as BLACK color and the next four lines
are printed as RED color in turn. Total 20 character lines will be printed.
7. The self-test automatically ends and cuts the paper after printing the following.
** Character Test Completed **
8. Back-Lash printing is possible when the DIP switch 1-7 is ON, or the printing is skipped when the DIP
switch 1-7 is OFF.
9. The printer is ready to receive data as soon as it completes the self-test.

Rev. 3.02

- 13 -

SRP-270
(A) Serial Self-Test Sheet

Rev. 3.02

(B) Parallel Self-Test Sheet

- 14 -

SRP-270
(A) Serial Self-Test Sheet

Rev. 3.02

(B) Parallel Self-Test Sheet

- 15 -

SRP-270

3. Product Specifications
3-1 Appearance
3-1-1 Printer Dimensions (mm)

Figure 3-1 Printer Dimension
3-1-2 AC Adapter Dimensions (mm)

Figure 3-2 Adapter Dimension

Rev. 3.02

- 16 -

SRP-270
3-1-3 Feature Locations

1. Cover, A/C/D
2. Case-Upper, A/C/D
3. Case-Lower, A/C/D
4. Label-Control
5. Power Switch
6. Bracket DIP Switch
9a.RS-232C/RS-485 (Serial I/F Connector)
9b.IEEE-1284(Parallel I/F Connector)
9c.USB(USB I/F Connector)
10. Drawer Kick-Out Connector
11. DC Power Jack

Figure 3-3 Feature Location

Rev. 3.02

- 17 -

SRP-270
3-2 General Specifications
Item
Product
Processor
Memory
Interface Serial
(RS-232C / RS-485)

Interface Parallel

USB
Printer
Auto Cutter
Power Consumption
AC Adapter
Environment
Condition
Weight
Dimensions(mm)
Reliability

Description
• SRP-270 : RS-232 Serial Communication
• SRP-270S : RS-485 Serial Communication
• SRP-270P : IEEE1284 Parallel Communication
• SRP-270U : USB Communication
• MITSUBISHI M16C/62 Group M30622 SFP (16 Bit)
Internal RAM Size : 3K Byte
• EPROM : 1Mbits (M27C010)
• SRAM : 256Kbits (KM62256)
• Flow Control :
1) DTR / DSR (H/W Flow Control)
2) XON / XOFF (S/W Flow Control)
• Baud Rate : 1200 / 2400 / 4800 / 9600 Bps
• Receive Buffer : 4 Kbytes
• Connector : DB25P Female (I/F PBA Side)
• Mode :
1) Forward Mode : Compatibility Mode
2) Reverse Mode : Nibble / Byte Mode
• Connector : Self-Powered
• Transfer Type : BULK
• Speed : 12 Mbps (Full-Speed)
• Power : Self-Powered
• Printing Method : 9pins Impact Serial Dot
• Printing Speed : 4.6 Line/Sec
• Type : Guillotine
• Cutting Method : 1 Point Partial Cutting
• Approx. 24W
• Input : AC 100V ~ 240V, 50Hz/60Hz
• Output : DC 24V±5%, 1.5A
• Temperature : 0℃ ~ 40℃
• Humidity : 30% ~ 80% RH
• 3.2 Kg (A Type) / 3.5 Kg (C Type) / 3.6 Kg (D Type)
• 2.2 Kg (A Type) / 2.5 Kg (C Type) / 2.6 Kg (D Type)
• A Type : 160 X 249 X 130
• C Type : 160 X 249 X 149
• D Type : 160 X 249 X 160
• Head: 300 million dots
• Printer: 18 million lines (MCBF)
• Auto Cutter: 1 million cuts

Remark

External ROM Version

The Flow Control, Baud
Rate, Stop Bit and Parity
are determined by DIP
S/W position.

Packing
Unpacking

3-3 Printer Mecha Specifications
3-3-1 Printer Mecha Specification
Item
Description
Model
• SMP-710/SMP-710N
Print Method
• Serial Impact Dot Matrix type (9-Pin Dot)
Printing Direction
• Bi-Direction
Printing Speed
• 4.6 Lines / Sec (9 x 7 Font 40 Columns)
Printing Resolution
• 160(W) x 144(L) DPI
Paper Feeding
• Performed by Step Motor
Paper
• Rolled Paper : W 76±0.5 x Max ø 83mm
Supply Voltage
• 24V ± 10% : Step Motor, Head
• 5V ± 10% : Home Sensor, Motor Driver IC
Connector
• 30P (Dot Head, Sensor Signal, Motor Control and Power Input)
• LIFE : Approx.20 Million Print Lines
Head Life
• Approx. 300 million Dots / Wire
Weight
• Under 650g (Excluding Ribbon Cassette, Auto Cutter)

Rev. 3.02

- 18 -

Remark

SRP-270
3-3-2 Character Specification
Item
H
Dot Interval
V
Font Type
Print Font
Printing Columns
Character Size (mm)
Column Interval (mm)
Line Interval

Description
0.3175 mm
0.3528 mm
ASCII
9x9
33
3.2 x 1.7
2.13
1/6“

7x9
40
3.2 x 1.4
1.59
1/6“

Remark
Chinese
16 x 16
5.7 x 3.0
3.19
1/3“

3-3-3 Printer (SMP-710/SMP-710N) Pin Description
Pin No.
Pin Name
Descriptions
1
Printer Head
Head #6
2
Printer Head
Head #8
3
Printer Head
Head #4
4
Printer Head
Head #9
5
Printer Head
Head #2
6
+24Vdc
The Voltage for Driving Print Heads
7
+24Vdc
The Voltage for Driving Print Heads
8
+24Vdc
The Voltage for Driving Print Heads
9
Print Head
Head #3
10
Printer Head
Head #5
11
Printer Head
Head #1
12
Printer Head
Head #7
13
Thermistor
Thermistor Output Value in Printer Head
14
15
GND
16
17
18
Carriage Motor ON/OFF
Control Driving voltage or Holding Voltage Of Carriage Motor
19
Carriage Motor A
Phase A of the Carriage Motor
20
Carriage Motor B
Phase B of the Carriage Motor
21
Vcc (+5 Vdc)
22
Vcc
23
Feed Motor ON/OFF
Control, Driving Voltage or Holding Voltage of Feed Motor
24
Feed Moter A
Phase A of the Feed Motor
25
Feed Moter B
Phase B of the Feed Motor
26
H/S Output
27
P/E Output
28
+24 Vdc
The Voltage for Driving Motors
29
+24 Vdc
The Voltage for Driving Motors
30
Sol-

Rev. 3.02

- 19 -

SRP-270
3-3-4 Printer Head Specification
Item
Description
Model
• DH400-G10
• Type: Ballistic Type (Free Fight)
Specification
• Number of Wire: 9Pin
• Resistance: 10W ± 15%
• Inductance: 4.5mH ± 15% (Open Circuit)
Solenoid Coil
• Temperature Rate: 155 Deg.C
• Insulation Resistance: 10MW
• Type: constant Voltage
• voltage: 24VDC ± 5% (Normal ) (At Printer Head)
Driver Circuit
• Current: 1.3 A
• Pulse: 330μ Sec (Head On Time)
• Fly Back Voltage: 48VDC (Min)
• Platen Gap: 0.51 ± 0.1 mm
Performance
• Max Frequency: 1500 Hz
• Forms Capability: Original + 2 Copies
• Max Operating Temp: 65°C
Temperature
• Max Transient Temp: 140°C (For 5 Minutes)
3-3-5 Printer Head Thermistor Specification
Item
Description
• LP310-1J (Tama Elec. Co., Ltd) or
Type
Correspond to it correspond to it
Electronic
• Resistance R25: 17.3 KW (At 25°C)
Characteristics
• B Value: 3950K ± 2
• Operating Temp: 120°C ~ 150°C
Max Operating Limit
• Time Constant: Max 30 sec (In the air)
Rx Formula
• RX = R25 x Exp {B x (1/TX -1/T25) ]}
3-3-6 Feed & Carriage Motor Specification
Item
Description
Model
• PM42S-048-SYM4 (NMB Electronic Co., Ltd)
Voltage
• 24 VDC ± 10%
Current
• 500 mA / Phase (Peak)
Resistance
• 10 W
Step Angle
• 7.5°
Pull Out Torque
• 1200 PPS 200 g/cm
3-3-7 Auto cutter specification
Item
Description
Model
• ORC-RUG80-2 (OHYANERIKI MFG. Co., Ltd)
Type
• Guillotine Type
Motor
• DC Brush Motor Fk-180SH-12280
Voltage
• 24VDC ± 10%
Current
• 400 mA (Average), 1.6 A (Peak)
3-3-8 Paper Specification
Item
Description
Paper Type
• Roll Paper
Paper Roll Width
• W76 ± 0.5 mm (2.99” ± 0.00200”)
Paper Roll Diameter
• Max x ø 83mm (3.26”)
• Thickness: 1 Sheet 0.06~0.085mm
Normal Paper
(0.0028 ~ 0.0034”)
• Weight: 52.3 ~64 g/m2 (0.115 ~ 0.1411 lb)

Rev. 3.02

- 20 -

Remark

Remark
Any thermistor which
correspond to it

T : Absolute Temperature
Remark

Remark
Mabuchi Motor

Remark

SRP-270
3-3-9 Ribbon Cassette Specification
Item
Description
Standard
• ERC-38 (Black / Red)
Color
• Black & Red
Size
• 13 mm (W) x 6 mm (L)
• ERC-38 (B/P): 1,500,000 Characters (Black)
Life
750,000 Character (Red)
(Continuous Printing 7 x 9 Font / ASCII / 25℃)
3-3-10 Other Component Specification
Item
Description
Paper End Sensor
• Reflection Type Micro Switch
Paper Roll Near End
• Micro Switch Factory option
Sensor

Remark

3-4 SMPS Specifications
3-4-1 SMPS (Switching Mode Power Supply) Specification
Item
Description
Input Voltage
• 100VAC ~ 240VAC
Input Current
• 1.5A (Max)
Line Regulation
• +24V ± 1%
Load Regulation
• +24V ± 5%
Ripple Noise
• Peak 300mV
O.C.P
• 2.3A ~ 2.5A (Over Current Protect)
3-4-2 SMPS Output Connector
Pin Number
Signal Name
1
+24 VDC
2
GND

Power Connector

Rev. 3.02

- 21 -

Remark

SRP-270
3-5 Interface Specifications
3-5-1 RS-232C Serial Interface
3-5-1(a) Specification
Item
Data Transmission
Synchronization
HandShaking
(Flow Control)
Signal Level
Baud Rate
Data Word Length
Parity
Connector

Description

Remark

• Serial
• Asynchronous
• H/W : DTR / DSR
• S/W : XON / XOFF
• Logic”1” (MARK) : -3V ~ -15V
• Logic”0” (SPACE) : +3V ~ +15V
• 19200 / 2400 / 4800 / 9600 Bps
• 7 Bit / 8 Bit
• None / Even / Odd
• DB25P Female (I/F PBA)
Table 3-14 RS-232C Specification

XON: ASC Code 11h
XOFF: ASC Code 13h

※ Note: The HandShaking (Flow Control) / Data Word Length / Baud Rate / Parity functions depend
on the DIP Switch settings. Refer to the User’s Manual.

3-5-1(b) RS-232C I/F Cable

Printer Side: D-SUB25P-Male
Ferrite Core : 1 Turn (OP-118E : 18.2 x 12.5 x 25.5)
Figure 3-6 RS-232C Cable

Rev. 3.02

- 22 -

CONN : User Spec
In Case PC : D-SUB25P-Female or
D-SUB9P-Female

SRP-270
3-5-1(c) Cable Connection
PRINTER
SIDE (25P)

HOST
SIDE (25P)

PRINTER
SIDE (25P)

HOST
SIDE (9P)

Figure 3-7 RS-232C Cable Connection

3-5-1(d) Signal Description
Pin No. Signal name
Direction
1
FG
2
TxD
Output
3
RxD
Input
4
RTS
Output
5
CTS
Input

DSR

DTR

Function
Frame Ground
Transmit Data
Receive Data
Ready To Send
Clear To Send
This signal indicates whether the host computer can receive data.
(H/W flow control)
1) MARK(Logic1) : The host can receive a data.
2) SPACE(Logic0) : The host can not receive a data.
Input
3) The printer transmits a data to the host, after confirming
this signal.
4) When XON/XOFF flow control is selected, the printer does
not check this signal.
Signal Ground
This signal indicates whether the printer is busy. (H/W flow control)
1) MARK(Logic1) : The printer is busy.
2) SPACE(Logic0) : The printer is not busy.
Output
3) The host transmits a data to the printer, after confirming
this signal.
4) When XON/XOFF flow control is selected, the host does not
check this signal.
Table 3-15 RS-232C Pin Description

3-5-1(e) H/W Flow Control
When DTR/DSR flow control is select, before transmitting a data, the Printer checks whether the host is
BUSY or not. If the host is BUSY, the Printer does not transmit a data to the host. If the host is not BUSY, the
Printer transmits a data to the Host. The host is the same. Refer to the Interface Part of Chapter 4-3 Special
Circuit Diagrams.

Rev. 3.02

- 23 -

SRP-270
3-5-1(f) S/W Flow Control
When XON/XOFF flow control is selected, the printer transmits XON(ACSII 11h) or XOFF(ASCII 13h) signal
through the TXD line. If the Printer is BUSY, the Printer transmits XOFF(ASCII 13h) to host through the TXD
line. Then the host recognize that the Printer is BUSY. So, the host does not transmit a data to the Printer. If
the Printer is released from BUSY, the Printer transmits XON(ASCII 11h) to host through the TXD line. Then
the host recognize that the Printer is not BUSY. And the host transmit a data to the Printer.
※ Note : Refer to the Operation Manual about XON/XOFF flow control.

3-5-2 RS-485 Serial Interface
3-5-2(a) Specification
Item
Data Transmission
Synchronization
HandShaking
(Flow Control)
Signal Level
Baud Rate
Data Word Length
Parity
Connector

Description
• Serial
• Asynchronous
• H/W : DTR / CTS (Same as DSR)
• S/W : XON / XOFF
• Logic”1” : SD1-SD2 ≥ 0.2V, RD1-RD2 ≥ 0.2V
• Logic”0” : SD1-SD2 ≤ 0.2V, RD1-RD2 ≤ 0.2V
• 19200 / 2400 / 4800 / 9600 Bps
• 7 Bit / 8 Bit
• None / Even / Odd
• DB25P Female (I/F PBA)
Table 3-16 RS-485 Specification

Remark

XON: ASC Code 11h
XOFF: ASC Code 13h

※ Note : The HandShaking (Flow Control) / Data Word Length / Baud Rate / Parity functions depend
on the DIP Switch settings. Refer to the User’s Manual.
3-5-2(b) RS-232C I/F Cable
Same as the appearance of RS-232C Cable
3-5-2(c) Cable Connection
PRINTER
SIDE

HOST
SIDE

Figure 3-8 RS-485 Cable Connection

Rev. 3.02

- 24 -

SRP-270
3-5-2(d) Signal Description
Pin No. Signal name Direction
1
Frame GND
2
SD2
Output
3
SD1
Output
4
RD2
Input
5
RD1
Input
7

SGND

8
9

DR2
DR1

10
11

CS2
CS1

Function
Frame Ground
Send Data
”H” : SD1 > SD2 , “L” : SD1 < SD2
Receive Data
”H” : RD1 > RD2 (RD1-RD2 ≥ 0.2V)
“L” : RD1 < RD2 (RD1-RD2 ≤ 0.2V)
Signal Ground
When DTR/DSR is selected, this signal indicates whether the printer is
BUSY or READY. (H/W flow control)
1) DR1 > DR2 (H) : The printer is BUSY.
Output
2) DR1 < DR2 (H) : The printer is READY.
3) The host computer transmits a data to the host,
after confirming this signal.
When DTR/DSR is selected, this signal indicates whether the host
computer is BUSY or READY. (H/W flow control)
Input
1) CS1 > CS2 (H) : The host computer is BUSY.
2) CS1 < CS2 (H) : The host computer is READY.
3) The printer transmits a data to the host, after confirming this signal.
Table 3-17 RS-485 Pin Description

※ Note : BUSY condition and other information refer to the User’s Manual.
※ Note : This format is used when the UART for RS-232C is connected to the RS-485 driver.
3-5-2(e) H/W Flow Control
When DR1,2/CR1,2 flow control is select, before transmitting a data, the Printer checks whether the host is
BUSY or not. If the host is BUSY, the Printer does not transmit a data to the host. If the host is not BUSY, the
Printer transmits a data to the Host. The host is the same. Refer to the Interface Part of Chapter 4-3 Special
Circuit Diagrams.
3-5-2(f) S/W Flow Control
When XON/XOFF flow control is selected, the printer transmits XON(ACSII 11h) or XOFF(ASCII 13h) signal
through the TXD line. If the Printer is BUSY, the Printer transmits XOFF(ASCII 13h) to host through the TXD
line. Then the host recognize that the Printer is BUSY. So, the host does not transmit a data to the Printer. If
the Printer is released from BUSY, the Printer transmits XON(ASCII 11h) to host through the TXD line. Then
the host recognize that the Printer is not BUSY. And the host transmit a data to the Printer.
※ Note : Refer to the Operation Manual about XON/XOFF flow control.

3-5-3 IEEE1284 Parallel Interface
Bidirectional parallel interface : in accordance with the IEEE1284 Nibble/Byte mode.
3-5-3(a) Forward Mode Specification (Compatibility mode)
Data transmission from host computer to printer : Centronics compatiable
Item
Data Transmission
Synchronization
HandShaking
Signal Level
Connector

Rev. 3.02

Description
• 8-bit Parallel
• External supplied nStrobe signals
• nACK and Busy signals
• TTL compatiable
• Centronics 36P
Table 3-18 IEEE1284 Specification

- 25 -

Remark

SRP-270
3-5-3(b) Reverse Mode Specification (Nibble / Byte mode)
Data transmission from the printer to the host computer.
The STATUS data transmission from the printer to the host computer is accomplished in the Nibble or Byte
mode. This mode allows data transmission from the asynchronous printer under the control of the host
computer. Data transmission in the Nibble mode are made via the existing control lines in units of for bits
(Nibble). In the Byte mode, data transmission in accomplished by making the 8-bit data lines bidirectional.
Neither mode can operate at the same time as the compatibility mode, so switching is always required.
3-5-3(c) Signal Specification (Compatibility/Nibble/Byte mode)
Pin No.
Source
Compatibility Mode
Nibble Mode
1
Host
nStrobe
HostClk
2
Host / Printer
Data 0 (LSB)
3
Host / Printer
Data 1
4
Host / Printer
Data 2
5
Host / Printer
Data 3
6
Host / Printer
Data 4
7
Host / Printer
Data 5
8
Host / Printer
Data 6
9
Host / Printer
Data 7 (MSB)
10
Printer
nAck
PtrClk
11
Printer
Busy
PtrBusy/Data3,7
12
Printer
Perror
AckDataReq /Data2,6
13
Printer
Select
Xflag/Data1,5
14
Host
nAutoFeed
HostBusy
15
NC
ND
16
GND
GND
17
FG
FG
18
Printer
Logic-H
Logic-H
19~30
GND
GND
31
Host
nlnit
nInit
32
Printer
nFault
nDataAvail /Data0,4
33
GND
ND
34
Printer
DK_Status
ND
35
Printer
+5V
ND
36
Host
nSelectln
1284-Active
Table 3-19 IEEE1284 Pin Description

Byte Mode
HostClk
Data 0 (LSB)
Data 1
Data 2
Data 3
Data 4
Data 5
Data 6
Data 7 (MSB)
PtrClk
PtrBusy
AckDataReq
Xflag
HostBusy
ND
GND
FG
Logic-H
GND
nlnit
nDataAvail
ND
ND
ND
1284-Active

3-5-3(c) IEEE1284 I/F Cable

Host
Side

Printer
Side
Figure 3-9 IEEE1284 Cable

Rev. 3.02

- 26 -

Centronics
36P

SRP-270
3-5-4 USB2.0 Interface
SRP-270 support the USB (Universal Serial Bus) Serial Communication.
3-5-4(a) Specification
Item
Transfer Type
Data Signal
Data Format
Transceiver
Speed
Power
Cable & Connector
Other

3-5-4(b) Signal Description
Pin No.
Signal Name
Shell
Shield
1
VBUS
2
D3
D+
4
GND

Description
• BULK
• Bi-direction, Half-Duplex
• Differential Signal Pair (D+ / D-)
• NRZI Format
• Zero Bit Stuffing after 6 ones
• Differential Receive Sensitivity : 200[mV]
• Differential common Mode Range : 0.8 ~ 2.5[V]
• Single-End Receiver Threshold : 0.8 ~ 2.0[V]
• 12 Mbps
• Self-Powered
• Cable : 5m / 2m
• Connector : B Type
• Support USB SPEC V1.1
Table 3-20 USB Specification

Assignment(Color)
Function
Drain Wire
Frame Ground
Red
Host Power : DC5[V] / 500[mA]
White
Differential Data Line
Green
Differential Data Line
Black
Signal Ground
Table 3-21 USB Pin Description

3-5-4(c) USB I/F Cable

Figure 3-10 USB A-B Type Cable

Rev. 3.02

- 27 -

Remark

SRP-270

3-6 Cash Drawer Specifications
3-6-1 Cash Drawer Cable

Ferrite Core : 1 turn (OP-18E : 18.2 x 12.5 x 25.5)
Figure 3-12 Cash Drawer Cable
3-6-2 Cable Connection
Pin No.
1
2
3
4
5
6

Description
Frame GND
Cash Drawer Driver Signal #1
Drawer Open / Close Signal
+24V
Cash Drawer Driver Signal #2
Signal GND
Table 3-23 Cash Drawer Cable Connection

※ Note : +24V is always output through pin 4 during power on.

Rev. 3.02

- 28 -

Direction
Output
Input
Output
-

SRP-270

4. Hardware
4-1 Wiring Diagram

[Figure 4-1 Board Wiring Diagram]

Rev. 3.02

- 29 -

SRP-270
4-2 Block Diagram

[Figure 4-2 Block Diagram]

Rev. 3.02

- 30 -

SRP-270
4-3 Special Circuit Descriptions
4-3-1 Power Circuit
This system is operated under 110Vac or 230Vac. The power circuit supplies the three differential DC voltage
sources.

[Figure 4-3 Power Block Diagram]
No.
1
2

VOLTAGE
+24VDC
+5VDC

DESCRIPTION
Cash Drawer Solenoid Driving / Step Motor Voltage
Logic IC Driving Voltage / Sensor

1) Drawer Driving and Feed, Auto Cutter Motor Voltage : +24Vdc
+24VDC is supplied from SMPS. This Voltage is smoothed by capacitors (C1,6,39).
This voltage is used as a Printer Head, Printer Motor, Cash Drawer Solenoid Driving voltage and a source
voltage of the +5V voltage sources.
2) Logic IC Driving Voltage: +5V
+5Vdc Logic driving voltage is produced by the step-down dc-dc converter U1(34063A). That is, U1 produces
rectangular wave. This makes D2 (EK04) and L6 store energy. The voltage is smoothed by C8 (470uF) and
then +5Vdc Logic voltage is produced.

Rev. 3.02

- 31 -

SRP-270
4-3-2 RESET Circuit
Reset signal is a signal in order to start-up CPU under Power-on. Reset circuit uses a reset ICTL7705ACD
(U5). When +5Vdc is fallen under 4.3Vdc by Power-off, reset signal prohibits the system from misoperating
by lowering down to 0V.

[Figure 4-4 Reset Block Diagram]

5ms

[Figure 4-5 Reset Waveform]

Rev. 3.02

- 32 -

SRP-270
4-3-3 Cash Drawer Circuits
The circuit is used for opening cash drawer and driven by the Q8 (STA471). When its state is high level
signal, Q8 (STA471) drive the solenoid to open the cash drawer. As an optional item, we provide sensor
switch (we call it a compulsory switch) which checks the drawer whether it is opened or not. This sensor
switch turns on for the drawer open condition, and turns off for the other.
※ Caution: make sure that the Cash Drawer solenoid resistance is more than 20Ω.

[Figure 4-6 Cash Drawer Block Diagram]

Rev. 3.02

- 33 -

SRP-270
4-3-4 I/F PBA Detect Block Diagram
When the printer is ON, the printer checks what kind of the I/F PBA is installed. After detection, the CPU
specify the I/O port properly. The following is the method of I/F PBA detection.
First, The CPU sends a “I/F Sel “ signal (P7.3) to I/F PBA. The I/F PBA has the three return Signal
(DIPC1~C3).
The CPU recognize the I/F PBA by the value of the three return signal.
I/F PBA
RS-232C
RS-485
IEEE1284
USB2.0
No Connection

Rev. 3.02

DIP_C1
L
L
H
H
L

DIP_C2
L
H
L
H
L

- 34 -

DIP_C3
H
L
L
L
L

SRP-270
4-3-5 RS-232C Communication Block Diagram
The CPU is used for serial communication.
And also RS-232C Driver (MAX232), is used to serial communication.
Show following block diagram.

M30622SFP

[Figure 4-8 RS-232C Communication Block Diagram]

[Figure 4-9 RS-232C Communication Waveform]

Rev. 3.02

- 35 -

SRP-270
4-3-6 RS-485 Communication Block Diagram
The CPU is used for serial communication.
And also RS-485 Driver (MAX488), is used to serial communication.
Show following block diagram.

M30622SFP

[Figure 4-10 RS-485 Communication Block Diagram]

[Figure 4-11 RS-485 Communication Waveform]

Rev. 3.02

- 36 -

SRP-270
4-3-7 Parallel Communication Block Diagram
The printer support the bidirectional Parallel Interface with Centronics, Nibble, Byte Mode.
The Centronics is Forward and the Nibble, Byte are reverse Mode.

M30622SFP

[Figure 4-10 IEEE1284 Communication Block Diagram]
4-3-8 USB Communication Block Diagram
The printer support the USB (Universal Serial Bus). The transfer type of the printer is the BULK.

USBN9602

M30622SFP

48[MHz]

[Figure 4-11 USB2.0 Communication Block Diagram]

Rev. 3.02

- 37 -

SRP-270
4-3-9 DIP Switch Circuit
The key Board Circuit consist of the scan signal of 4 lines and the return signal of 4-line. The CPU sends
repeatedly and continuously the scan data R1, 2, 3, 5 through P10.0~10.2, P1.1. The DIP S/W information
input in the return signal if the specific DIP S/W is ON Status during the given time. The CPU reads the data
through C1~C4 and analyzes what DIP S/W is ON and performs the selected function.

M30622SFP
R1~R3,R5
DIODE(MMBD6050L)

[Figure 4-12 DIP Switch Block Diagram]

Rev. 3.02

- 38 -

SRP-270

5. Disassembly and Assembly
5-1 General Precautions on Disassembly
This chapter describes the Disassembly and Reassembly procedures for the Printer of SRP-270 Series.
This Printer contains electronically sensitive device. Use caution when handling any component.
Whenever servicing the machine, you must perform as follows:
1. Disconnect the DC power jack of Adapter from the Printer before Disassembling.
2. Use a flat and clean surface.
3. Replace only with authorized components.
4. Do not force to remove plastic-material components.
5. Make sure all components are in their proper position.

5-2 Plate Bottom
1. Remove four screws securing the Plate Bottom.
Separate the Plate Bottom from the Lower Case.

3. Unplug Auto Cutter wire and FPC Cable from
the Main PCB.

2. If you want to remove the PCB Cover, remove
screw securing, as shown below.

Rev. 3.02

- 39 -

SRP-270
5-3 Cover Assy (SRP-270D Type)
1. Open the Cover Assy and take out the Spool
Winding, as shown below.

2. Push the locking lib to the direction of arrow
and remove the Cover Assy, as shown below.

5-4 Cover Assy (SRP-270A & SRP-270C Type)
1. Open the Cover Assy.

Rev. 3.02

2. Pull the Cover Assy upward and remove it.

- 40 -

SRP-270
5-5 Case Upper Assy (SRP-270A & SRP-270C Type)
1. Open the cover Assy.

3. Separate the Case Upper from the Case
Lower.

2. Remove four screws.

Rev. 3.02

- 41 -

SRP-270
5-6 Case Upper Assy (SRP-270D Type)
1. Push the locking lib to the direction of arrow and
remove the Cover Assy, as shown below.

2. Remove four screws securing the Case Upper.
Separate the Case Upper from the Case Lower.

5-7 Printer Assy (SRP-270A & SRP-270C Type)
2. Remove two screws securing the Printer Assy.
Separate the Printer Assy from the Case Lower.

1. Before you disassembly the Printer
Assy, you should remove :
- Plate Bottom (see Chapter 4-2)
- Cover Assy (see Chapter 4-3 & 4-4)
- Case Upper Assy (see Chapter 4-6)

Rev. 3.02

- 42 -

SRP-270
5-8 Printer Assy (SRP-270D Type)
1. Before you disassembly the Printer Assy, you
should remove :
- Plate Bottom (see Chapter 4-2)
- Cover Assy (see Chapter 4-3 & 4-4)
- Case Upper Assy (see Chapter 4-6)

3. Remove two screws securing the Printer Assy.
Separate the Printer Assy from the Case Lower.

2. Remove the Spool Gear and Belt, as shown
below.(SRP-270D Type)

5-9 Auto Cutter Assy
1. Before you disassembly the Auto Cutter Assy, you
should remove :
- Plate Bottom (see Chapter 4-2)
- Cover Assy (see Chapter 4-3 & 4-4)
- Case Upper Assy (see Chapter 4-6)
- Printer Assy (see Chapter 4-7 & 4-8)

2. Remove two screws securing the Auto Cutter
Assy. Separate the Auto Cutter Assy from the
Printer Assy, as shown below.

3. Before you reassembly the Auto Cutter Assy,
you should set up the Belt and Hinge.

Rev. 3.02

- 43 -

SRP-270
5-10 Main PCB
2. Remove four screws securing the Main PCB.
Separate the Main PCB from the Main Frame.

1. Before you disassembly the Main PCB,
you should remove :
- Plate Bottom (see Chapter 4-2)
- Cover Assy (see Chapter 4-3 & 4-4)
- Case Upper Assy (see Chapter 4-6)
- Printer Assy (see Chapter 4-7 & 4-8)

5-11 Interface Board Assy
1. Before you disassembly the Interface Board Assy, you should remove :
- Plate Bottom (see Chapter 4-2)
- Cover Assy (see Chapter 4-3 & 4-4)
- Case Upper Assy (see Chapter 4-6)
- Printer Assy (see Chapter 4-7& 4-8)
2. Remove two screws and take out the Interface Board Assy, as shown below.

Rev. 3.02

- 44 -

SRP-270

6. Alignment and Adjustments
6-1 Printer Adjustment
When assembling this printer, be sure to refer to the required adjustment procedure.
To ensure normal operation of the printer after disassembly or replacement of a Component for maintenance
or repair. Be sure to perform along to the required method.
* Adjustment of Head gap
Adjustment
Step
1
2

Description Points

in Adjustment

• Rotate Gear lst Reduction to move the Head unit
to L side.
• Insert the thickness gauge between Head unit and
Platen, then rotate the Ad.
Level L and adjust the gap.

- Appropriate gap: 0.50~0.60mm

- In order to make the gap narrow
(wide), turn Ad.
Lever to mark ’-(+)’

• Move the Head unit then check if the proper
gap from R side center has been achieved.

• If Head gap is not proper, adjust Head gap by
rotating Ad.Lever R.

- If gap is not correct, repeat once
more.

(Replacement of Head unit)

Follow below steps for replacing Head unit
1. Loosen the Ribbon frame
2. Disassemble the Head unit from the Head Carriage and take out the Head FPC from the connector of
PCB Assy.
4. Replace the Head unit and assemble, according to the order of sub Aassy-1
5. After assembling, adjust the gap as above “Adjustment” indicates.
6. Assemble the Ribbon Frame.

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7. Troubleshooting
7-1 Power Problem
• Check the Power Out on SMPS.
• Check the Fuse.
• Check the related Pattern.
• Check the IC34063.

7-2 System Problem
• Check the Reset part (IC & Pattern)
• Check the Clock on FS741 (14.7456MHz)
• Check the Adr/Data line Pattern

7-3 Printer Problem
• Check the Feed Motor Signal on CPU
• Check the Feed Motor Block on PCB (STA471, Step Motor Connection)
• Check the Carriage Motor Signal on CPU
• Check the Carriage Motor Block on PCB (STA471, Step Motor Connection)
• Check the Ribbon Select Signal on 74HCT574 (U22)
• Check the Ribbon Block on PCB (STA471, Connection)
• Check the Auto Cutter Signal on 74HCT574 (U22)
• Check the Auto Cutter Block on PCB (TA8428K, Connection)
• Check the Near-End, Home Sensing Signal on Main PBA.
• Check the Sensing Block. (Sensor, Harness)
• Check the Head Trigger Signal, Head Signal on CPU.
• Check Dot Printing Block on Main PBA. (STA471, 74HCT05, Connection)

7-4 Cash Drawer Problem
• Check the Drawer Connector & Harness.
• Check the Drawer Signals on 74HCT574.
• Check the Drawer Block on Main PBA (STA471, Connection).

7-5 DIP S/W Problem
• Check the Output Signal (DIP R1~4)
• Check the Diode.
• Check the Input Signal (DIP C1~C4)
• Check the related Circuit & Pattern

7-6 RS232 Problem
• Check the connection of the RS-232C CONN and Other side.
• Check the I/F Cable whether it is open or short.
• Check the Txd, Rxd Pin on CPU.
• Check the MAX232 Driving Chip and related Circuit on I/F PBA.
• Check the connection of the H/W handshaking Line and Other side (DTR/DSR)

7-7 RS485 Problem
• Check the connection of the RS-485 Connector and Other side.
• Check the I/F Cable whether it is open or short.
• Check the TXD, RXD Pin on CPU.
• Check the MAX488 Driving Chip and related Circuit on I/F PBA.
• Check the connection of the H/W handshaking Line and Other side (DR1,2/CS1,2)
• Check the Voltage Level of each Line.

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7-8 IEEE 1284 Problem
• Check the Control Line (CS3, WR, RD).
• Check the 1284 Control Line and Status Line.
• Check the Signal of ICs (U3, U6, U5)
• Check the related Circuit and Pattern on I/F PBA.
• Check the 1284 Control, Status Data Line.

7-9 USB Problem
• Check the Control Line & Signal. (CS3, RD, WR, INT)
• Check the Data Line & Signal.
• Check the Connector (34P)
• Check the Clock (48MHz)
• Check the related Circuit and Pattern on I/F PBA & Main PBA.
• Check the D+ whether it is Pull up to V3.3.
• Check the USB Cable whether it is open or short.

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SRP-270

8. Appendix (Spec of SMP-710/710N)
8-1 Specifications
8-1-1 Printing specifications
Item

Description

Printing method

serial impart dot-matrix

Head wire configuration

9-pin serial type

Dot pitch

0.352mm(1/72")

Dot wire diameter

0.3mm(0.01")

Printing direction

Bidirectional with logic seeking

Printing width

63.5mm(2.5")

Line feed

4.233mm(1/6") (default setting)

Paper feed method

Friction feed

Paper feed speed

Approximately 6.2 inches/second (during continuous paper feeding)

Characters per line

See the table on the next page

Characters per inch

See the table on the next page

Total dot count
(horizontal direction)

7×9 font (400 half-dot positions per line)
9×9 font (400 half-dot positions per line)

Print speed

Approximately 4.6 lines/second (40 columns, 16cpi)
Approximately 8.4 lines/second (16 columns, 16cpi)

※ NOTE: If the print duty ratio is too high, the operation of the print head is stopped by the duty limit.
In such circumstances, the print speeds shown above cannot be guaranteed.
cpi=characters per inch.

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SRP-270
8-1-2 Character specifications
8-1-2-1 Character sets
Item

Description

Alphanumeric

International

Graphics

128×7 pages

8-1-2-2 Character structure
* 7×9 with 400 half-dot positions per line.
* 9×9 with 400 half-dot positions per line.

Character structure
Horizontal × Vertical

Character
structure
Character Set
ANK

7×9
Graphics
ANK
9×9
Graphics
ANK
7×9
Graphics
ANK
9×9
Graphics

Character
Dimensions
WxH
1.2×3.1 mm
(.047×.122")
1.7×3.1 mm
(.070××.122")
1.6×3.1 mm
(.063×.122")
2.0×3.1 mm
(.079×.122")
1.2×3.1 mm
(.047×.122")
1.6×3.1 mm
(.063×.122")
1.6×3.1 mm
(.063×.122")
1.9×3.1 mm
(.075×.122")

Dot spacing
Between
Characters

Characters Per
Line (cpi)

Characters Per
Inch (cpi)

3 half dots

13.3

2half dots

17.8

2half dots

14.5

※ NOTE: The default font is 7×9; the dot spacing between characters is either 3 half dots or 2 half
dots, depending on programming.

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SRP-270
8-1-3 Paper specifications
Item

Description

Paper types

Paper roll: Platen paper or pressure-sensitive paper

Paper roll width

76±0.5mm (2.99±0.20")

Paper roll maximum diameter

Ø83mm(3.27")

Paper roll core

Unless there is an optional near-end detector, you cannot use a paper roll
with the core and paper glued together.

Normal paper

Thickness: 1 sheet: 0.06 to 0.085 mm(.0024 to.0034")
Weight: 52.3 to64g/m2(13.9 to 171b) (45 to 55kg/1000 sheets/1091×788)

Pressure-sensitive paper

Original sheet + up to 1 copy sheet
1 sheet thickness: 0.05 to 0.08mm(.0020to.0031")
Total thickness: 0.2mm(.0078")or less

(*1) This dimension shows the distance from the manual cutter to the print position.
(*2) Values for the printing area are calculated (between dot centers) with the wire diameter{0.29mm(.011")}

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SRP-270
8-1-4 Ribbon Cassette specifications
Compatible Model

Color

Ribbon life ("1)

ERC-38 (B)

Black

3 million characters {with continuous printing at 25℃(77°F)}

ERC-38 (B/R)

Black and Red

Black: 1.5million characters {with continuous printing at 25℃(77°F)}
Red: 750,000 characters {with continuous printing at 25℃(77°F)}

("1) Ribbon life is based on the following conditions:
Character font: 7×9 font (with descenders)
Print pattern: ASCII 96-character rolling pattern. See the specification published by SMP-710/710N
for the print pattern example.
※NOTE: Malfunctions and other problems may occur if a ribbon cassette other than the specified
one is used.

8-1-5 Environmental specifications
Item
Temperature

Description
Operating: 0°to 40℃ (32°to 104°F)
At 34℃(93°F)or higher, there are humidity restrictions;
See the figure below.
Storage: -5°to 50℃(23°to 122°F), except paper and ribbon
Operating: 30% to 80% RH(non-condensing)
Storage: 10% to 90% RH(non-condensing),except paper and ribbon

Humidity

Vibration resistance

Impact resistance

Rev. 3.02

* When packed
Frequency: 5 to 55Hz
Acceleration: 5G
Sweep: 10 minutes (half cycle)
Duration: 1 hour
Directions: x, y and z
* When packed
Package: SMP-710/710N standard package
Height: 60cm(23.62")
Directions: 1 corner, 3 edges, and 6 surfaces
* When unpacked
Height: 5cm(1.97")
Directions: Lift one edge and release it(for all 4 edges)

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SRP-270
8-1-6 Reliability
Item

Description

MCBF

This is an average failure interval based on failures relating to wear out and random failures up
to the life of 18 million lines.

8-1-7 Main Unit specifications
Item

Paper
Feed
Motor

Carriage
Motor

Print
Head
Unit

Home
Position
Sensor

Description

Type

4-phase, 48-polarity, PM-type stepping motor

Drive voltage

24 VDC±10%

Winding resistance

10Ω±1Ω at 25℃(77°F), per phase

Current consumption

Average: 400mA at 24 VDC, 25℃(77°F), 570mA maximum

Type

4-phase, 48-polarity, PM-type stepping motor

Drive voltage

24 VDC±10%

Winding resistance

10Ω±1Ω at 25℃(77°F), per phase

Current consumption

Peak: 1.5 A in maximum
Average: 400mA at 24 VDC, 25℃(77°F), 570mA maximum

Number of solenoids

Winding resistance

9.5Ω±10% at 25℃(77°F), per phase

Drive voltage

24 VDC±10%

Type

Photo sensor

Voltage

5 VDC±5%

Output level

LOW when the carriage home position is detected.

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SRP-270
8-1-8 Electrical specifications
8-1-8-1 The explanations of the circuit operations
1) Head Carriage Step Motor
- It rotates and moves the Dot Head by using the several gears and synchronous belt
- Print Speed : 4.6 Line/Sec
- This step motor is control by constant current method.
So, current flows two red line of step motor is Max.560㎃
- This step motor is control by SMA7029M (Recommended)
2) Paper Feed Step Motor
- It is used when the paper is fed.
- The characteristics of step motor is as same as head carriage step motor
3) Home Sensor
- It detects the head position
- It decides the start point of printing
4) Solenoid
- It plays part in exchanging printing color (red → black)
5) Head
-It plays part in printing a character (Axiohn Co.)
8-1-8-2 Circuit Block Diagram

8-1-9 Mechanisms specifications
This printer consists of 5 mechanisms;
Head feeding Mechanism. Printing Mechanism. Paper Feeding Mechanism. Detector Mechanism, Ribbon
Mechanism. How is the external view of SMP-710/710N Impact dot matrix printer as shown. For details on the
operating principles and handling of each of the mechanisms, refer to "Principle of Movement" in section 8-110 and "Handling, Maintenance and Repair" in 8-2.

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SRP-270
8-1-10 Principle of Movement
8-1-10-1 Head Feeding Mechanism
This printer is using DC24V PM Type Stepping motor.
As shown in figure the motor section consists of the motor. Motor speed control IC, motor drive/brake circuit
and motor speed interface.
When the carriage motor is driven and the carriage motor gear is moved in the direction of arrow B(forward
rotation), the rotational power is conveyed to the belt drive pulley, then the belt. Next the carriage sub
assembly, which is fixed to the belt, moved in the direction of arrow B.
When the carriage motor gear is rotated in the direction of arrow A (reverse rotation), the carriage sub
assembly is moved in the direction of arrow A.

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SRP-270
8-1-10-2 Printing Mechanism
When the specified print head drive pulse is input to the drive coil, the iron core is magnetized, and the
actuating plate is pulled in the direction of arrow A.
This action pushed the wire toward the platen, When the wire strike s the ink ribbon and paper against the
platen(*), a single dot is printed.
When the energizing of the drive coil is completed, the wire and actuating plate are re turned to the standby
position by the wire return spring and actuating plate spring.
(*)The "platen" is the portion of the base paper feed Assy being struck by the wires during printing.

8-1-10-3 Detection Mechanism
The detection mechanism unit consists of the home position detection, paper detection.

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SRP-270
8-1-10-4 Home Position Detection Mechanism
The home position detection mechanism consists of the detection protrusion at the left side of the carriage
sub assembly and the sensor sub assembly at the left side of the base frame. It determines the home
position, identifies the carriage position, and detects carriage sub assembly operation errors.
The sensor sub assembly consists of an LED and photo transistor. When the carriage sub assembly moves,
the detection protrusion passes between the LED and photo transistor and blocks the optical axis of the
photo transistor, changing the output level of the photo transistor.

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SRP-270
8-1-10-5 Paper Feeding
Paper feeding is performed by conveying the paper feed motor` s rotational power from the paper feed motor
gear through the paper feed reduction gear, paper feed gear, and paper fed roller.
Since the paper feed roller and paper hold roller are pressed together, paper advances to the top of the
paper feed frame assembly because of the friction between the rubber of the paper feed roller and the paper
hold roller.
As shown in Figure, Paper feeding mechanism consists of Rubber Roller Hold Roller Assy, Step Motor, Gear
Step M/T idle, Gear MF and Gear M/F Idle The paper feeding operation can be selected by controlling the
Step Motor. For detail explanations of paper feeding operation, refer to "SPECIFICAT10NS
for SMP-710/710N".
Paper feeding is made as follows; As Step Motor set turning by electric signal, Gear Rubber Roller comes
into turning, passing Gear Step M/T Idle for Shaft Roller is pressed to rubber Roller by Spring Roller, Paper is
feed by friction A min. Pitch is 1/144".
Under condition Step Motor stops, turning Gear MF to direction of arrow or to 1, he contrary, and can feed or
back feed as paper wants.

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SRP-270
8-1-10-6 Ribbon feeding
When the carriage motor rot ate s counter clockwise and the carriage motor gear rotates in the direction of
arrow A, the Gear Reduction B' Gear Reduction A Gear Reduction B, rotate in the directions of arrows B,
and C, B' respectively.
This causes the Lever Ribbon Feeder Assy to move in the direction of arrow E, rotating round the Gear
Reduction A shaft in the center, until the Gear Reduction B goes in with the Gear Reduction C.
Since the Gear Reduction C and the ribbon feeder are always engage d, the ribbon feeder rotates in the
direction of arrow G.
When the carriage motor rotates in the reverse direction and the carriage motor gear rotates in the direction
of arrow H, the Lever Ribbon Feeder Assy moves in the direction of arrow F, disengaging the Gear reduction
B from the Gear Reduction C.
Therefore, the ribbon feeder Assy rotates in the direction of arrow G only when the carriage motor rotates
counterclockwise.
Then the ribbon feed and ribbon hold rollers in the ribbon cassette, which are engaged with the ribbon feeder
Assy, rotate and the ribbon is feed.

* Operation of Color change
Color change system consists of Ribbon feeding Mechanism in section 8-1-10-6 and Ribbon Shifting
Mechanism.
Shifting Mechanism on Ribbon consisted of Head carriage Assy, Ribbon Frame, Lever color change,
solenoid Assy as shows in figure.

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SRP-270
* Ribbon shifting operation
Ribbon shifting action is as follows.
As the Carriage Motor rotates clockwise, Head carriage Assy moves from left to right. When you'd like to
change from red color to black color you should shift Head carriage Assy as shows in figure timing chart.
Delivers to Gear HF-1, and turns to direction of arrow wit Lead Cam.
At this moment, if not energized in Solenoid, Solenoid Lever and Shift cachet are not moved, and so Shift
Cam does not turn, and Ribbon Frame is not in Shift Up/Down.
As Solenoid moves energized, Solenoid lever goes down and turns Shift Cam which snatches with moving
Shift cachet under stop. Shift Cam, along Top/Bottom makes to Shift Up/Down of Ribbon Frame and printing
color is printed by Black/Red. Moving Shifting is up to energization and control of Solenoid.

[ Description of Timing chart.1 ]
① 14Step(28T)
- Head carriage step motor moves left(14step) after covering the home sensor
- The maximum distance of head tip to move left is 18step, so we can make room for moving space of
4step, exactly 1.2696 mm
② This area is consisted of 3 region
(Accelerating area of left side[30T] + constant speed area[6T] + vertical alignment adjustable time[3T])
③ 400T (printing area, when printing 40 characters of 7×9 font, space between one character and
another one is 3T)
④ 421T(printing area + decelerating area of right side[24T])
- Printing area includes part of right side area
⑤ 24Step - Paper feeding area
⑥ 24T - Distance until outing of head pin when printing from right to left
⑦ 400T - Printing area
⑧ 436T - Printing area + decelerating area of right side
⑨ The start position of head carriage tip
⑩ On uncovering of home sensor
⑪ When outing the first head pin
⑫ When paper is feed

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SRP-270
[ Description of Timing chart.2 ]
⑬ When head carriage step motor stops(left → left)
⑭ The start position of head carriage step motor from right to left
⑮ When first outing of head pin from right to left
ⓐ When last outing of head pin from right to left and when starting line feed
ⓑ When ending of printing from fight to left
ⓒ The start position of second printing from left to right
ⓓ Solenoid on time(unlocking color-change printing) : 24ms
ⓔ When head carriage tip covers the home sensor (after printing from right to left)

* Electrical Circuit Operation Principles (Hardware Configuration)
[ Component connection diagram ]
The electrical circuitry of the printer consists of the main circuit board and the interface circuit boards.
The figure below is a component connection diagram of the electrical circuitry.

[ Circuit board block diagram ]
The figure below illustrates the circuit block diagram for the printer.

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SRP-270
8-2 Handling the Printer
8-2-1 Precautions on Printer Handling
8-2-1-1 Precautions on transport
1) When trans porting this printer. It’s proper handling method is to support both side of Frame main with
both hands.
2) When trans porting this printer. never grasp it by Ribbon cassette case, PCB Connector , and Solenoid
Assy or other such parts.
3) Never expose the printer to impact by dropping or striking it.
4) Take special care that no foreign matter contacts the PCB at the bottom of the printer.

8-2-1-2 Precautions on storage
1) Avoid storage in locations exposed to excessive dirt or dust, direct sunlight or excessive moisture.
2) In case of long- term storage, place the printer into a polyethylene bag after wrapping it in anti- rust paper,
then store it in a dry location.

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SRP-270
8-2-1-3 Precautions on use
1) Since this printer employs magnetic substance (Motor, Solenoid), avoid using it in locations exposed to
excessive iron filings, dirt, dust or other foreign particles.
2) Never perform a printing operation without the paper and ribbon installed.
3) The printer must be installed on a level surface.
4) When installing this printer, be sure to us e a buffer of rubber or other similar material between the
mounting brackets of the printer and the printer itself (to prevent vibrations caused by printing or paper
feeding and to avoid increased reverberations)
5) For the mounting holes of the printer, be sure to us e the round or oblong holes.
6) Because the PCB is at the bottom of the printer, take care that there is no contact between its parts and
mounting base and that no foreign matter contacts the board.
7) If end mark on Rolled paper appears. Replace the Rolled paper.

8-2-2 Paper Setting Procedures (Insertion/Removal)
Make sure to always use only the paper types prescribed in the SMP- 710/710N Specifications.
8-2-2-1 Inserting Rolled Paper
1) As shown in figure, cut straight the leading edge of rolled paper.
2) After the leading edge of paper goes through Paper Guide, slide the paper until it reaches the Rubber
Roller and Hold Roller.
3) In order to pas s the leading edge of paper between Rubber Roller and Hold Roller, rotate Gear Knob in
the arrow direction.
※ NOTE: Never perform paper insertion without carefully following the above precautions, because
such handling may result in defective paper feeding or paper jams.

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SRP-270

8-2-2-2 Precautions on Paper Insertion
1) After cutting the edge of paper straight as shown in figure insert the paper.
Which is described on next figure.
2) Insert the paper straight into the paper entrance section.
3) The end of the paper which is crinkled and bended, should not be inserted.
4) Make sure that the rolled paper tape is ripped off and discarded before inserting into the printer.
8-2-2-3 Precautions on paper removal
Cut the paper behind Bas e Paper Feed Assy.
8-2-2-4 Paper removal must be performed using one of the four method below
* Remove method by manual
1) Back feed the paper by rotating Gear Knob to contrary arrow direction manually and remove the paper.
2) After Feed the paper by rotating Gear Knob to arrow direction cutting paper in backside Base Paper
Feed Assy, and remove the paper.
* Remove method by automatically
1) Back feed the paper by using electrical operation (by paper back-feed button), then remove the paper.
2) After cutting paper in backside paper guide Assy, feed the paper by using electrical operation (by paper
back feed button), then remove the paper.
※ NOTE: Never perform paper removal without carefully following the above precautions , because
such handling may result in defective paper feeding or paper Jams.

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SRP-270
8-2-3 Ribbon Cassette Installation
The Ribbon Cassette use must conform to the standards prescribed in the Specifications.
Never use non-standard types, because such use may result in such trouble as the malfunction of printing
quality.
8-2-3-1 Ribbon Cassette Installation
Procedure for installing the Ribbon Cassette as shown figure.
1) By finger, turn the ribbon feeding roller of the Ribbon Cassette in the arrow direction to tighten up slack in
the ribbon.
2) Bet the Ribbon Cassette onto the Ribbon Frame, then push the Ribbon Cassette down.
3) After setting is done, turn the ribbon feeding roller by finger again in the arrow direction, and check that the
ribbon is not bent.
8-2-3-2 Removing the Ribbon Cassette
Grip the left side of Ribbon Cassette, and raise slowly the Cassette then raise right direction and lift/remove
Ribbon Printer.

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SRP-270
8-3 Maintenance
To ensure the maintenance of this printer at its initial performance level throughout a long product life as well
as preventing potential troubles, be sure to perform maintenance and management according to the points
described in the following subsections.
8-3-1 Cleaning
Eliminating dirt or strains
1) Wipe off the soiled sections using alcohol or benzene.
2) Eliminating dust, scraps, and other foreign particles.
3) Use a vacuum cleaner to carefully draw out all foreign particles from every part of the printer.
※ NOTE
1) Never use thinner, tricholyene nor ketone solvents as such use may deteriorate or damage the plastic
parts.
2) Check the lubricant (each cleaned section and perform remaining lubrication as required.
(See subsection 8-4-3, "Lubrication points")
8-3-2 Inspection
The maintenance and check-up procedures for this printer are grouped into two types.
1) Daily checks that can be easily performed by the operator of the printer during the course of daily work.
2) Periodic checks that can be performed only by persons having a through understanding of the printer
mechanisms. These maintenance and check procedures should be implemented according to the
technical level of the person conducting them.
8-3-2-1 Daily check
The printer and printer operation are checked to see if the printer is being operated in the proper manner and
always being maintained in optimum condition. If any unsatisfactory points are discovered. They should be
replaced.
1) Check that the Ribbon Cassette is securely installed in the ribbon unit,
2) Check that the Ribbon Cassette in use conforms to the Specifications. (ERC-38 or compatible)
3) Check the ribbon for bending, twisting or damage.
Replace the Ribbon Cassette if it is affecting print quality.
4) Check that the paper in use conforms to that described in the Specifications.
8-3-2-2 Periodic check
After every 6 months, the printer parts should be checked for wear. (cleanliness, deformation, remaining
lubrication, installation status, etc,) If any unsatisfactory points are discovered, they should be replaced.
1) Check the printer interior for adhesion of paper dust or scraps. Dust, and other foreign particles, cleaning
out any adhered particles with a vacuum cleaner (paying special attention to dirt in the vicinity of the
detectors.)
2) Check all the springs for deformation, replacing any deformed springs.
3) Check the gap between Head unit and Platen Assy. If there is a malfunction, perform repair according to
section Disassembly & Assembly.
4) Check the lubricant and adhesive status of all applications points, applying lubricant or adhesive as
required according to section 8-4 Lubricants and Adhesive Application.
5) Check if printing, paper feeding, ribbon feeding and ribbon shifting are normal. If not, perform repair
according to subsection 8-6-3 Repair guidelines.
6) Observe all of the functions and check for malfunctions due to wear or deformation of parts, paper jam. etc.
If there is a malfunction, perform repair according to subsection 8-6-3 Repair gulde71nes.

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8-4 Lubricants and Adhesive Application
Lubrication and application adhesive plays an important role in maintaining this printer at its initial
performance level, throughout a long product life as well as preventing potential troubles. Make sure to apply
the specified lubricants or adhesive in the appropriate amounts at the specified intervals.
8-4-1 Lubricant Requirements
Before applying the lubricants during an assembly or disassembly procedure, be sure to first thoroughly
clean the part to be lubricated. For details on lubrication.
* Lubrication Classes
Concerning the lubrication interval, lubrication should be performed periodically according to the lubrication
classes described below. If lubrication becomes deficient due to cleaning, disassembly or parts replacement,
be sure to lubricate the required part regardless of the lubrication interval.
A: Lubrication every 6 months.
B: Lubrication after on overhaul or every 1 million lines
8-4-2 Lubricant Types
The type of oil used greatly influences performance and durability, and special attention is required to its low
temperature characteristic. Consequently, the oils to be used with this printer are specified by us on the basis
of the result of the thorough analyses of technical data for many types of oils and various experiments.
2 types of oils to be used with this printer are HG-31S, G 948P.
8-4-3 Lubrication Points
No
1
2
3
4
5
6
7
8

No Lubrication Point
Outer periphery of shaft hold roller
Contact point between cam of head carriage and ribbon frame
Contact point between shaft ribbon frame and lever cold change
Contact point between spring ribbon feeder and ribbon feeder
Outer periphery of shaft head carriage
Contact point between solenoid plunger and spring solenoid
Outer periphery of all gears
Outer periphery of shaft head guide

Oil type
HG-31S
HG-31S
HG-31S
HG-31S
HG-31S
G948P
HG-31S
HG-31S

* Precautions on lubrication
Never apply lubricant to Gear Ratchet or outer periphery of Rubber Roller.
If lubricant has accidentally been applied to these parts, clean them with alcohol.
8-4-4 Adhesive Application Requirements
To prevent from screws getting loose by various vibration while transporting the printer, adhesive should be
applied after tightening screws. When performing disassembly or parts replacement.
8-4-5 Adhesive types
The adhesive type for use with this printer : Screw lock
8-4-6 Adhesive Application Points
No
12

Rev. 3.02

Adhesive Application Point
Volume resistance adjustment of main PCB

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Adhesive Type
Screw lock

SRP-270
8-5 Tools, Lubricants and Adhesives
8-5-1 List of Tools
No
1
2
3
4
5
6
7
8
9
10
11

Tool Designation

Availability
O
O
O
O
O
O
O
O
O
O
O

Brush #1
Brush #2
Cleaning brush
Screwdriver (+) No.2
Tweezers
Round pliers
Diagonal cutting nipper
Electric Soldering iron
Thickness gauge
ET holder #2.5
ET holder #3

8-5-2 List of Lubricants and Adhesives
Item
Description

Oil
CALTEX REGAL R/D #68, 948P

Grease
HG-31S

Adhesive
Screw lock

8-6 Repair
In Consideration of the level of expertise required for implementation of after-service and repair procedures
for this printer, such procedures have been grouped into two rankings: Level A and Level B.
The person in charge of repair, therefore, should perform the repair procedures appropriate to the class and
to his/her own level of expertise.
8-6-1 Repair Levels
1) Level A: Requires general knowledge and technical skills regarding the operating principles and
construction of the printer, but does not require previous repair experience.
2) Level B: Requires full knowledge and technical skills regarding the operating principles and construction of
the printer as well as previous repair experience.
8-6-2 Repair Procedures
In the case a problem occurs, check its symptoms and status .clarify the source of the problem with
reference to subsection 8-6-3 Repair guidelines, then repair the damaged area Note that the tables of
subsection 8-6-3 Repair Guidelines, consist of the 5 items listed below, enabling troubleshooting and repair
to be performed with speed and efficiency with minimum error.
1) Phenomenon: Check the symptoms of the trouble.
2) Condition: Compare the trouble status of problem with the description of this column and locate the
matching status.
3) Cause: This column lists the potential causes on the basis of the trouble status, allowing the location of
the trouble to be checked. It also lists the repair level for each cause, so be sure to refer to this column
before attempting repair.
4) Check point and Method: In correspondence to the cause, this column lists what parts to check as well as
the checking procedure to be used. Be sure to inspect the check-points according to the method described
here.
5) Repair Method: Repair the trouble area according to the description in this column. If the identical
phenomenon and condition remain unchanged after performing the repair, check another item of the
"CAUSE" column then perform the pertinent repair.

Rev. 3.02

- 67 -

SRP-270
8-6-3 Repair Guidelines
Phenomenon
1. Motor
does not
rotate

2. No dot
printing
is performed

Rev. 3.02

Condition
Motor does not
rotate despite
printing
command
has been given

Motor rotates
normally but no
dot printing is
performed

Cause
①Defective
power input to
motor

Level
B

Check point & Method
·Check the input
power
·Check the input
voltage (24V±2V)
between the
motor terminals
of the connector
using a tester or
oscilloscope
·Check input signal
·Check if the signal
is being input
to the motor drive
terminal of the
connector using
an oscilloscope
·Check the conductivity
between the
pertinent terminals

②Defective
motor drive
signal

③Damaged
or Improper
connection
between
motor terminals
of the
connector

④Defective
motor

⑤Occurrence
of paper jam

①Head FPC
is disconnected
from it
connection
②Broken
common
lead in head
FPC

·Check if the head FPC
is properly inserted
into its connector

③Common
lead between
the head FPC
and connector
is broken
④Defective
timing detector
sub Assy

·Check the conductivity
between the common
lead of head FPC and
other terminals
(20Ω±10%)
·Check the conductivity
of the common
lead section
·Check the voltage
(28V±2V)
·Observe by
oscilloscope
to check if a timing
signal is being
generated

- 68 -

·Apply 24V to the
leads of the
motor then check
the rotation
(red: + black: -)
·Check the deformation
of Head pin guide or
platen paper guide

Repair Method
·Inspect and repair
the power
supply circuit

·Replace the
drive signal
generating
circuit

·Replace the main
circuit board Assy
if there is no
conductivity
·If improperly
connected,
reconnect
the pertinent
leads in the proper
manner
·Replace the
motor, if it
does not rotate
·Replace Head
pin guide or platen
paper guide if they
are deformed or
destroyed
·If not, securely
reinsert the head
FPC
·Replace the
head unit, if
there is no
conductivity
·Replace the main
circuit board Assy
if there is no
conductivity or 28V
·Replace the timing
detector sub Assy,
if no timing signal is
being generated

SRP-270
Phenomenon
2. No dot
printing
is performed

3. Missing
of Head dots

4. Missing of
Dot Head

Rev. 3.02

Condition
Motor rotates
normally but no
dot printing is
performed

Only specific
dots are never
printed

All of date are
not printed

Cause
⑤Defective
input charge
pulse

Level
B

⑥Positional
relations-hip
between
head and
the platen

①Damaged
lead in head
FPC

②Lead
breakage
between
connector and
FPC terminals
③Damaged
lead of a dot
driving coil

④Defective
timing detector
sub Assy
⑤Defective
input charge
pulse
①Defective
contact of the
Head FPC
②Malfunction
of the Head
unit
③Defective
Timing detector
Assy
④Defective
input charge
pulse

Check point & Method
·Observe by
oscilloscope
to check if the input
charge pulse is within
rated values
·Pulse rating:
For voltage and pulse
width refer to the
specifications for
SMP-710/710N
·Check if the gap
between the Platen
and the tip of
head is correct
correct value :
0.51±0.1mm
·Check the conductivity
between the pertinent
common lead of the
head FPC and other
terminal
·Check the conductivity
between the pertinent
terminals

Repair Method
·If input pulse is
not generated or
if such pulse is
outside rated values
repair the driving
control circuit

·If incorrect, perform
repair according
to "Adjustment"

·If there is no
conductivity,
replace the head
·Replace the main
circuit board Assy if
these is no
conductivity

·To check if the
·If the resistance is
resistive value of the
outside rated
pertinent dot driving
values, replace the
coil is within rated
head
values, measure the
resistance of the
terminal between
connectors Rated
value : 20Ω±10%
See cause ④ of phenomenon 2

See cause ⑤ of phenomenon 2

See cause ① of phenomenon 3

B
B
B

- 69 -

·Check if paper dust is
·If the paper dust is
caught in the tips of
caught, remove it
the head pin
See cause ④ of phenomenon 2
See cause ⑤ of phenomenon 2

SRP-270
Phenomenon
5.
Intermittently
defective
character
width

Condition
Intermittent
changes in
character width

6. Motor
rotation does
it stop

7. Paper is
not feed

Rev. 3.02

All Printing is
done at one
line without the
paper being
feed

Cause
①Wear or
damage of
Lead Cam or
the gear
②Defective
input charge
pulse
①Defective
R·L reset
detector sub
Assy

Level
A

②Defective
motor drive
signal
①Defective
paper supply

Check point & Method
·Check the teeth of
each gear and of the
Lead Cam for wear
and damage

Repair Method
·If worn or damaged,
replace the
defective gear or
the Lead Cam

B
See cause ⑤ of phenomenon 2
B

②Detect in
step motor
③In proper
connection or
damage of
terminal
connector in
step motor, or
cutting of wise
or damaged
connected part

④Occurrence
of paper jam
⑤Wear or
damage of the
teeth of the
gears
⑥Wear of the
Rubber Roller

⑦Deformation
of the spring
Roller
⑧The Shaft
Roller rotates
malfunction
⑨Turning
direction of
Gear

·Use an oscilloscope to
check if a signal is
generated from of the
R(L) reset detector
sub Assy by rotating
the Lead Cam

·Replace the R(L)
reset detector sub
Assy if no signal is
generated

See cause ② of phenomenon 1
(Check input signal stop ⇒ high)
·Check the width,
length and thickness
of the paper
·Check the paper
feeding path

·Use the standard
paper
·Repair each supply
mechanism so that
paper supply is
smooth
·Check the end part
of paper
·Apply 24V to motor
·Substitute if motor is
and check to turn
not in turning
·Check flow of
·In case of no flow of
electricity between
electricity,
Pertinent terminal
substitute Assy for
main circular
·In case of no
connection, try to
connect with
leading
·In case of cutting
wire or damaged,
substitute step
motor
See cause ⑤ of phenomenon 1

·Check the gear for
wear or damage

·If there is wear or
damage, replace
the pertinent gear

·Check the surface of
the Rubber Roller for
wear
·Check if the Shaft
Roller has become
deformed
·Check to be
something in Gear
and to be well touched
·Check to be
something in gear and
to be well touched

·If the Rubber Roller
is worn, replace it

B
B

- 70 -

·If deformed, replace
it with a new spring
·If deformed, replace
the pertinent Shaft
Roller
·Remove dusts
removed wire

SRP-270
Phenomenon
8. Uneven
paper
feeding pitch

9. Ribbon
mechanism
does not
function

10. Defective
paper
insertion

11. No
working on
ribbon
shifting

Condition
Uneven line
spacing of the
printed paper

Despite normal
operation of
the printing
mechanism,
the ribbon not
feed

When the
paper is
inserted, it
jams or does
not come out to
the exit

No working of
ribbon shifting
in spite of
normally
moving printing

Cause
①Defective
paper supply
②Deformation
of the Spring
Roller
③Wear of the
Rubber Roller
④The Shaft
Roller rotates
malfunction
⑤Wear or
damage of the
teeth of the
gears
⑥Deformation
of the Platen
Paper Guide
710
⑦Bad turning
of gear
①The ratchet
of Ribbon
Cassette is
damaged or
worn out
②Wear or
damage of the
teeth of the
gears
①Other
substances
may exist in
paper passing
track
②Method of
paper insertion

Level
A

·Check if paper is
inserted according to
the method described

①Betraying
from damage
or transforming
of spring
solenoid

·Check betraying or
damage, transform of
spring solenoid

②

·Check betraying from
spring shift clutch and
damage and
transform of it

See cause ⑦ of phenomenon 1

See cause ⑥ of phenomenon 1

See cause ⑧ of phenomenon 1

See cause ⑤ of phenomenon 1

·Check if Platen Paper
Guide has become
deformed

·If deformed, replace
it with a new platen
Paper Guide

See cause ⑨ of phenomenon 1

·Check whether the
ratchet of Ribbon
Cassette is damage or
worn out

·Replace it if
damaged or worn
out

·Check ribbon feed
Assy and gear
reduction a, b, c for
wear of damage
·Check if other
substance may exist
in paper passing track

·If there is wear or
damage, replace it

③Attrition or
damage of shift
cam shift

Rev. 3.02

Check point & Method
Repair Method
See cause ① of phenomenon 1

·Measure exterior
diameter of spring
shift clutch and check
with eyes

- 71 -

·Clean out any
particles with a
vacuum cleaner
·Always insert the
paper according to
the method
described
·Substitute with new
spring or reconnect
it
·In case of damage
or transform of it,
substitute by new
spring
·Substitute with new
spring or reconnect
with it in case of
betraying
·In case of damage
or transform of it,
substitute by new
spring
·In case of attrition or
damage, substitute
them

SRP-270
Phenomenon
12. No
working of
Solenoid

13. No
working of
ribbon
rotating

Rev. 3.02

Condition

Cause
①Entry of
solenoid is cut

Level
B

②Gear tooth
cam, ratchet
and ribbon
frame get
dusted or
altered
①Transforming
or damage of
spring shift
clutch
②Attrition or
damage of shift
cam, shift
ratchet
③Transform or
damage of
ribbon frame

Check point & Method
·Measure resistant
value between
terminal of solenoid
resistance: Some
70±10% (25℃)
·Check with eyes
transforming or
dusting in gear tooth,
cam, ratchet, and
ribbon frame

Repair Method
·In case cutting
substitute solenoid

·Substitute dust to
take out or part

See cause ② of phenomenon 12

See cause ③ of phenomenon 12

④Betray of
ribbon papers

⑤Volume of
ribbon

- 72 -

·Measure size of the
part moving cam of
ribbon frame,
measure horizontal
degree and check with
eyes
·Check with eyes
ribbon paper in ribbon
frame
·Different with each
other of color and rate
of ribbon

·In case of transform
or damage of ribbon
frame, substitute
them
·Set ribbon paper fit
ably with ribbon
frame
·Ribbon substitute

SRP-270
8-6-4 Assignment Connector Pin
8-6-4-1 Connector 30pin
* Connector: Head, head carriage/paper feed step motor, solenoid P/E sensor, control
* Model: 1.0mm FFC cable
Mechanism side: 403-030-099-061
[Taiwan TACK co.]
P/N In or Out
1
Output
2
Output
3
Output
4
Output
5
Output
6
Input
7
Input
8
Input
9
Output
10
Output
11
Output
12
Output
13
Output
14
Output
15
Output

Description
head #6
head #8
head #4
head #9
head #2
head com 24V
head com 24V
head com 24V
head #3
head #5
head #1
head #7
thermistor
ground
ground

P/N
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

8-6-4-2 Connector 14pin
* Connector: Head control
* Model: Mechanism side : GF120-14S-Ls
[LG cable co.]
P/N In or Out
1
Output
2
Input
3
Output
4
Output
5
Output
6
Output
7
Input
8
Input
9
Input
10
Output
11
Output
12
Output
13
Output
14
Output

Rev. 3.02

Description
thermistor (-)
thermistor (+)
head #7
head #1
head #5
head #3
com(24V)
com(24V)
com(24V)
head #2
head #9
head #4
head #8
head #6

- 73 -

In or Out
Output
Output
Input
Output
Output
Input
Input
Input
Output
Output
Output
Output
Input
Input
Output

Description
ground
ground
head carriage control sig
CA
CB
Vcc(5V)
Vcc(5V)
paper feed control sig
PA
PB
home send output
paper end output
24V
sol +(24V)
sol -

SRP-270
8-7 Disassembly
To disassemble this printer, perform the assembly procedures described in section 8-8 Assembly in the
reverse sequence. First, the main assembly blocks are disassembled and divided into the sub-assembly
blocks, then each of the individual blocks is disassembled.
Disassembling printer components beyond the example shown in exploded view of SMP-710/710N at the
PPL may result in damage to the printer and its functions, so you are advised not to do so.

8-8 Assembly
The assembly process is divided into the sub-assembly and main assembly procedures. First, assemble the
sub- assembly, then proceed to assembling the main assemblies.
Perform assembly while referring to component shapes and mounting positions shown in exploded view.
The '*' symbol in the "Assembly Step" column indicates the need for a (Check) or (Adjustment). The
(Adjustment) process is explained in section 8-9. Even if only a small amount of disassembly has been
performed, confirm the presence/absence of the pertinent adjustment point during assembly.
Circled numbers in the "Assembly Step" column indicate that lubrication is required during assembly of the
component and that such lubrication will be difficult unless performed during assembly.
Details on the application of lubricants or adhesives, including point that require application after total
assembly of the printer, are described in section 8-4 Lubrication and Adhesive Application perform such
application while referring to exploded view.
All small parts are represented by abbreviations as listed in the table below.
* List of abbreviations for small parts
Abbreviation
WBH
PH
WPH
T/T PH
T/P PH
PW
WW
PSW
SP
RE
PP
FS

Rev. 3.02

Explanation
Washer faced Binding Head Screw
Pan Head machine screw
Washer faced Pin Head Screw
Pan Head Taptite screw
Pan Head Tapping Screw
Plain washer
Wave Washer
Poly slide washer with slit
Spring pin
Retaining ring type-E
Parallel pin
Franged Screw

- 74 -

SRP-270
8-8-1 Sub-assemblies
8-8-1-1 Carriage Head Assy
Name of Parts
①BERIN G FE (2ea)
②CARRIAGE HEAD

Method and Procedure
1. At first, set the ①BERIN G FE
to be inserted into the shaft of JIG.
* Notice: The direction of insert
is to locate frange downward.
2. And then, set a ②CARRIAGE HEAD
to be inserted into the shaft of JIG.
3. Next , set other ①BERIN G FE to be
inserted into the shaft of JIG.
* Notice: The direction of insert is to
locate frange upward.
4. Lastly, insert two ①BERIN G FE in
the ②CARRIAGE HEAD by pushing
the handler of Lever Press.
< Check Point>
Check improper insertion of ①BERIN
G FE and fraction of ②CARRIAGE
HEAD.

Drawings

8-8-1-2 Lever Ribbon Feed Assy
Name of Parts
①SHAFT REDUCTION
“B”
②LEVER RIBON FEED
③GEAR REDUCTION
“B”
④WAVE WASHER
⑤E-RING (ø2.5)

Method and Procedure
1. At first, Grease ①SHAFT on the ②
LEVER RIBBON FEED with HG31S.
2. And then, Assemble ④WAVE
WASHER and Grease ④WAVE
WASHER.
3. Last, assemble ③GEAR
REDUCTION “B” and ⑤E-RING
(ø2.5).

Drawings

8-8-1-3 Ribbon Feeder Assy
Name of Parts
①SPRING RIBBON
FEEDER
②RIBBON FEEDER
③GEAR RIBBON
FEEDER

Rev. 3.02

Method and Procedure
1. Grease ①SPRING RIBBON
FEEDER with HG-31S and insert
that into ②RIBBON FEEDER.
2. And then, insert ③GEAR RIBBON
FEEDER to fit the section of hook.

- 75 -

Drawings

SRP-270
8-8-1-4 Lever Tension Belt C Assy
Name of Parts
①SHAFT PULLEY
②LEVER TENSION
BELT
③PULLEY
④WASHER
(2.6*5.0*0.5)

Method and Procedure
1. At first, grease ①SHAFT PULLEY
with HG-31S.
2. Next insert ③PULLEY and then
assemble ④WASHER (2.6*5.0*0.5).

Check ③PULLEY to rotate smoothly.

Drawings

Method and Procedure
1. Insert ②SWITCH LEVER to fit the
hole of ①SUB PCB.
2. And then, solder the land on the
①SUB PCB bottom side and attach
the ③WIRE ASSY on the land A, G.

After soldering, check the frozen lead
and short.

Drawings

Method and Procedure
1. Insert the ②SCREW MANUAL into
the right side hole of ①COVER
HEAD.
2. And then, assemble ③E-RING onto
the starting point of a spiral during
adhering closely to the ①COVER
HEAD.
3. Paste the ④CAUTION LABEL on
the right bottom side.

Drawings

8-8-1-5 Sub PCB Assy
Name of Parts
①SUB PCB
②SWITCH LEVER
③WIRE ASSY

8-8-1-6 Cover Head Assy
Name of Parts
①COVER HEAD
②SCREW MANUAL
③E-RING (ø2.5)
④CAUTION LABEL

Rev. 3.02

- 76 -

SRP-270
8-8-1-7 Bracket PF “R” Assy
Name of Parts
①BRACKET P/F “R”
②GEAR PF IDLE
③GEAR KNOB
④GEAR KNOB IDLE
⑤WASHER (1.6*3*0.3)

Method and Procedure
1. At first, grease the small shaft of
①BRACKET P/F “R” with EM-501.
Next, insert ②GEAR PF IDLE,
③GEAR KNOB, and ④GEAR
KNOB IDLE. Lastly, assemble
⑤WASHER.
2. Grease the outer diameter of gear
with EM-501.

Check ③GEAR KNOB to rotate
smoothly.

Drawings

Method and Procedure
1. Paste the ②TAPE D/F onto the
①PLATEN PLATE and set the sub
Assy into the rectangular hole of the
exclusive JIG.
2. Set the ③PLATEN to fit the groove
of JIG and paste by pushing.

Drawings

8-8-1-8 Platen Assy
Name of Parts
①PLATEN PLATE
②TAPE D/F
③PLATEN

Rev. 3.02

- 77 -

SRP-270
8-8-2 Main-assemblies
8-8-2-1 Base Paper Feed Assy - #1
Name of Parts
①BASE PAPER FEED
②SHAFT TAKE UP
③TAPE CUSION
④RUBBER PLATE (2EA)
⑤PLATEN ASSY
⑥SCREW SPECIAL (M2.6*7.5, 2EA)
⑦SHAFT RUBBER ROLLER
⑧ROLLER PAPER GUIDE (2EA)
⑨BEARING (2EA)
⑩E-RING (ø3, 2EA)
⑪GEAR ROLLER
⑫BRACKET PF R ASSY
⑬STEP MOTOR PF
⑭SCREW TAPPING (M3*6, 2EA)

Rev. 3.02

Method and Procedure
1. At first, set ①BASE PAPER FEED in the JIG. Next, insert
②SHAFT TAKE UP into the hole. Lastly, press it by Lever
Press.
2. Set ③TAPE CUSION to fit rectangular hole of ①BASE
PAPER FEED and then, insert ④RUBBER PLATE in both
side.
3. Insert ⑤PLATEN ASSY into the rectangular hole and then,
tighten two ⑥SCREW SPECIAL.
4. Make ①BASE PAPER FEED stand(right side), and then,
insert two ⑧ROLLER PAPER GUIDE and ⑨BEARING to fit
⑦SHAFT RUBBER ROLLER in both side one by one. Next,
fix the Sub Assy into the back face of ①BASE PAPER FEED
and fit two ⑩E-RING into the groove each other.
5. Set ⑪GEAR ROLLER onto right side shaft of ①BASE
PAPER FEED and then set ⑫BRACKET PF R ASSY.
6. Insert ⑬STEP MOTOR PF into the rectangular hole of
BRACKET PF and drag backward. Next, tighten two
⑭SCREW TAPPING on ⑫BRACKET PF R ASSY.

Check ROLLER to rotate smoothly.

- 78 -

SRP-270
8-8-2-2 Base Paper Feed Assy - #2
Name of Parts
①GEAR TAPE UP
②GEAR TU PULLEY
③WASHER BELT GUIDE
④WASHER (2.6*5*0.5)
⑤BRACKET PF L
⑥SCREW TAPPING (M3*6, 6EA)
⑦GUIDE PAPER A
⑧GUIDE PAPER B

Rev. 3.02

Method and Procedure
1. Make BASE PAPER FEED stand (left side), and then, insert
①GEAR TAPE UP to fit SHFAT(D-CUT) (long side is
downward). Next, grease SHFAT and teeth of GEAR with HG31S.
2. Set ②GEAR TU PULLEY onto SHAFT and insert ③WASHER
BELT GUIDE. Next fix with ④WASHER.
3. Set ⑤BRACKET PF L onto BASE PAPER FEED boss, and
then, tighten two ⑥SCREW TAPPING.
4. Rotate BASE PAPER FEED and set ⑦GUIDE PAPER A to
the back face, and then, tighten two ⑥SCREW TAPPING step
by step.
5. Make BASE PAPER FEED stand and set ⑧GUIDE PAPER B
to it, and then, tighten two ⑥SCREW TAPPING step by step.

- 79 -

SRP-270
8-8-2-3 Base Paper Feed Assy - #3
Name of Parts
①SUB PCB ASSY
②SCREW TAPPING (M2*3, 2EA)
③MANUAL CUTTER
④SCREW (M3*6, 2EA)
⑤PLATEN PAPER GUIDE
⑥SHAFT HOLE ROLLER
⑦HOLE ROLLER (2EA)
⑧SPRING HOLD ROLLER (2EA)

Rev. 3.02

Method and Procedure
1. Set ①SUB PCB ASSY to fit the hole in the bottom face of
BASE PAPER FEED and tighten two ②SCREW TAPPING.
2. Set the ③MANUAL CUTTER to the boss on the BASE
PAPER FEED and tighten two ④SCREW.
3. Hook ⑤PLATEN PAPER GUIDE on the manual cutter in the
front face of BASE PAPER FEED.
4. Grease section of ⑥SHAFT HOLE ROLLER mounted HOLE
ROLLER and insert two ⑦HOLE ROLLER. Next, set SHAFT
to the each groove of BASE PAPER FEED as fitting HOLD
ROLLER into PPG.
5. Hook two ⑧SPRING HOLD ROLLER on the both side of
BASE PAPER FEED.

Check the location of PLATEN PAPER GUIDE, status of
hooking, coming off.

- 80 -

SRP-270
8-8-2-4 Main assembling - #1
Name of Parts
①FRAME MAIN C/K ASSY-4
②SERIAL NO. TAG
③TAPE INSULATION
④LEVER COLOR CHANGE
⑤SOLENOID ASSY
⑥SPRING SOLENOID
⑦SCREW MACHINE (M2*3)
⑧GEAR PULLEY ASSY
⑨WASHER (ø2.6*5*0.5)
⑩LEVER TENTION BELT ASSY
⑪SCREW (M3*4)

Rev. 3.02

Method and Procedure
1. Set ①FRAME MAIN C/K ASSY-4 on the JIG.
2. Paste ②SERIAL NO. TAG in the right side and ③TAPE
INSULATION on the bending line in the bottom face.
3. Grease SHAFT(6 point) with HG-31S.
4. Insert ④LEVER COLOR CHANGE into SHAFT in the left
bottom side and fit WASHER(2.6*8*0.5).
5. Turn ⑤SOLENOID ASSY and ⑥SPRING SOLENOID
downward and insert it into the hole of LEVER C/C and M/F
side step by step. Next, tighten ⑦SCREW MACHINE.
6. Insert ⑧GEAR PULLEY ASSY and then, fit ⑨WASHER.
7. Insert ⑩LEVER TENTION BELT ASSY to the hole and then,
tighten ⑪SCREW two-third.

- 81 -

SRP-270
8-8-2-5 Main assembling - #2
Name of Parts
①GEAR REDUCTION A
②GEAR REDUCTION B
③RIBBON FEEDER ASSY
④GEAR REDUCTION “C”
⑤LEVER RIBBON FEED ASSY
⑥WASHER (ø 2.6*5*0.5, 2EA)
⑦MAIN PCB ASSY
⑧FPC CONNECTOR
⑨SCREW MACHINE (M3*4)
⑩CARRIAGE HEAD ASSY
⑪BELT SYNCHRONUOS
⑫SPRING LEVER TENSION BELT

Rev. 3.02

Method and Procedure
1. Set FRAME MAIN on the JIG.
2. Set ①GEAR REDUCTION A, ②GEAR REDUCTION B,
③RIBBON FEEDER ASSY and ④GEAR REDUCTION "C"
onto SHAFT sequentially. Grease teeth and upper face of
RIBBON FEED ASSY.
3. Insert ⑤LEVER RIBBON FEED ASSY and ⑥WASHER.
4. Attach ⑧FPC CONNECTOR to ⑦MAIN PCB ASSY. Next,
plug SOLENOID WIRE (block) in connecter 2p. And then, set
it to M/F and tighten two ⑨SCREW MACHINE.
5. Insert ⑪BELT SYNCHRONUOS into ⑩CARRIAGE HEAD
ASSY, and then, belt up round PULLEY and GEAR PULLEY.
6. Hoot ⑫SPRING LEVER TENSION BELT.

Check the tear of FPC.

- 82 -

SRP-270
8-8-2-6 Main assembling - #3
Name of Parts
①AD LEVER
②SHAFT HEAD GUIDE
③SHAFT HEAD CARRIAGE
④E-RING (ø 3)
⑤HEAD PRINT
⑥SCREW (M3*10, 2EA)
⑦BRACKET HEAD COVER “L”
⑧BRACKET HEAD COVER “R”
⑨SCREW MACHINE
(M2.6*3, 2EA)

8-8-2-7 Main assembling - #4
Name of Parts
①BASE PAPER FEED ASSY
②SCREW MACHINE
(M3*6, 3EA)
③STEP MOTOR H/F
④SCREW (M3*4, 2EA)
⑤RIBBON FRAME
⑥SPRING RIBBON FRAME
⑦E-RING (ø3, 3EA)
⑧HEAD COVER ASSY

Rev. 3.02

Method and Procedure
1. Set FRAME MAIN on the JIG.
2. Insert ①AD LEVER in the left side and then, turn to the downward.
Next insert the other ①AD LEVER into ②SHAFT HEAD GUIDE and
insert the Sub Assy into F/M from right to left and then, turn AD LEVER
downward.
3. Insert ③SHAFT HEAD CARRIAGE from left to right and fit ④E-RING
in the left side.
4. Insert FPC into ⑤HEAD PRINT and set HEAD Assy to CARRIAGE
HEAD, and then tighten two ⑥SCREW.
5. Tighten the screw mounted to LEVER TENTION BELT ASSY
completely.
6. Fit ⑦BRACKET HEAD COVER "L" and ⑧BRACKET HEAD COVER
"R" to both boss and then tighten two ⑨SCREW MACHINE.
Method and Procedure
1. Set FRAME MAIN on the JIG.
2. Put ①BASE PAPER FEED ASSY wire into the rectangular hole and
drag it. Next, set ①BASE PAPER FEED ASSY and tighten three
②SCREW MACHINE.
3. Turn up FRAME MAIN and then set ③STEP MOTOR H/F to the hole.
Next, tighten two ④SCREW.
4. Insert SUB PCB, STEP MOTOR P/F, STEP MOTOR H/F WIRE to the
connecters of MAIN PCB ASSY sequentially, and then alignment and
fix the WIRE ASSY by pressing the hooks.
5. Grease on the CARRIAGE HEAD, SHAFT RIBBON FRAME and
SHAFT HEAD CARRIAGE with HG-31S.
6. Hook ⑥SPRING RIBBON FRAME on the ⑤RIBBON FRAME and
insert the other side on the left side of SHAFT. Next, insert RIBBON
FRAME onto right side of SHAFT and insert the other side of RIBBON
FRAME onto SHAFT. Lastly, hook the spring (For more detail refer
next page.)
7. Tighten three ⑦E-RING. And assemble ⑧HEAD COVER ASSY.
Check the setting position of RIBBON FRAME and jam.

- 83 -

SRP-270
8-8-2-8 Main assembling - #5
Name of Parts
①RIBBON FRAME
②SPRING RIBBON FRAME
③E-RING (ø3, 3EA)

Method and Procedure
1. Insert ⓐSPRING RIBBON FRAME into the hole in left side of
ⓑRIBBON FRAME to ward arrow on shows in Fig. 1 detail.
2. Set ⓐSPRING RIBBON FRAME onto the ⓒSHAFT and then, move
the RIBBON FRAME toward arrow.
3. Next, insert RIBBON FRAME onto ⓓSHAFT toward arrow an shows in
Fig. 3.
4. And then, insert the other hole A of RIBBON FRAME onto ⓒSHAFT
and then, adjust the position of RIBBON FRAME to the center as
shows in Fig. 4.
5. Firs t E-RING to ⓒSHAFT and two E-RING to ⓓSHAFT.
6. Check RIBBON FRAME to move smoothly as operating it up and
down.

Rev. 3.02

- 84 -

SRP-270
8-8-3 Adjustment
When assembling this printer, be sure to refer to the required adjustment procedure.
To ensure normal operation of the printer after disassembly or replacement of a Component for maintenance
or repair. Be sure to perform along to the required method.
* Adjustment of Head gap
Adjustment
Step
1
2

Description Points

in Adjustment

• Rotate Gear lst Reduction to move the Head unit
to L side.
• Insert the thickness gauge between Head unit and
Platen, then rotate the Ad.
Level L and adjust the gap.

- Appropriate gap: 0.50~0.60mm

- In order to make the gap narrow
(wide), turn Ad.
Lever to mark ’-(+)’

• Move the Head unit then check if the proper
gap from R side center has been achieved.

• If Head gap is not proper, adjust Head gap by
rotating Ad.Lever R.

- If gap is not correct, repeat once
more.

(Replacement of Head unit)

Rev. 3.02

- 85 -

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Bixolon Receipt Printer Srp 270 Users Manual 270_SVC_Rev_3_02

srp270 54f11dc6-14b4-41e3-8d3b-3e06395c9d51 BIXOLON Printer SRP-270 User Guide |

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