BIXOLON SRP-270 User Manual

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Service Manual
SRP-270
Impact Printer Rev. 3.02
http://www.samsungminiprinters.com
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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
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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
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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
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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.
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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.
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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.
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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 field-
effect 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.
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2. Installation and Operation

2-1 Installation

2-1-1 AC Adapter Installation

2-1-2 Interface Cable Installation

SRP-270
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.

2-1-3 Cash Drawer Cable Installation

Cash Drawer Connector
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.

2-1-4 Ribbon Cartridge Installation

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.\
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.
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SRP-270

2-1-5 Paper Roll Installation

1. Using a new roll paper, unroll the paper and cut the end as shown.
6. If the paper is loose, wind the Rewind Spindle to tighten the paper.
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.
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.
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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. Turn the printer power switch off.
2. Remove the screw on the bottom of the printer and open the bracket.
3. Flip the DIP switches using tweezers or another narrow­ended tool. Switches are on when up and off when off down.
4. 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 FUNCTION ON OFF DEFAULT
1 OFF 2
Emulation Selection Refer to the following Table 1
3 Auto-Cutter Enable Disable OFF 4 FONT SPACE 2 3 OFF 5 ­6 -
Function for Service Engineer 7 8 Korean Type Selection Unified Complete OFF
• DIP Switch 2 SW FUNCTION ON OFF DEFAULT
1 Auto Line Feed
Always
Enabled 2 Hexadecimal dump YES NO OFF 3 Hand Shaking XON/OFF DTR/DSR OFF 4 Word length 7 bits 8 bits OFF 5 Parity check Enable Disable OFF 6 Parity selection EVEN ODD OFF 7 OFF 8
Baud Rate selection Refer to the following Table 2
NOTE
When the word length is 7 bits, you can not parity check OFF status.
OFF
OFF
Always
Disabled
OFF
OFF
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SRP-270

2-2-3 Setting the DIP switch (IEEE1284 Parallel, USB Interface)

• DIP Switch 1 SW FUNCTION ON OFF DEFAULT
1 OFF 2 3 Auto-Cutter Enable Disable OFF 4 FONT SPACE 2 3 OFF 5 ­6 ­7 8 Korean Type Selection Unified Complete OFF
• DIP Switch 2 SW FUNCTION ON OFF DEFAULT
1
2 Hex Dump YES NO OFF 3 Reserved - - OFF 4 Reserved - - OFF 5 Reserved - - OFF 6 Reserved - - OFF 7 Reserved - - OFF 8 Reserved - - OFF
• Table 1 – Emulation Selection SW – 1 SW – 2 MODE
OFF OFF Epson OFF ON Citizen
ON OFF Star
• Table 2 – Baud rate (bps) Selection Transmission speed SW – 7 SW – 8
19200 baud ON ON
2400 baud OFF ON 4800 baud ON OFF 9600 baud OFF OFF
Emulation Selection Refer to the following Table 1
Function for Service Engineer
Auto Line Feed
Always
Enabled
OFF
OFF
Always
Disabled
OFF
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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.
1B 21 00 1B 26 02 40 40 .! . . & . @ @ 02 0D 1B 44 OA 14 1E 28 ...D...( 00 01 0A 41 OD 42 OA 43 .. . 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.
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SRP-270
(A) Serial Self-Test Sheet (B) Parallel Self-Test Sheet
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SRP-270
(A) Serial Self-Test Sheet (B) Parallel Self-Test Sheet
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3. Product Specifications

3-1 Appearance

3-1-1 Printer Dimensions (mm)

SRP-270

3-1-2 AC Adapter Dimensions (mm)

Figure 3-1 Printer Dimension
Figure 3-2 Adapter Dimension
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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
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SRP-270

3-2 General Specifications

Item Description Remark
• SRP-270 : RS-232 Serial Communication
Product
Processor
Memory
Interface Serial (RS-232C / RS-485)
Interface Parallel
USB
Printer
Auto Cutter
Power Consumption • Approx. 24W
AC Adapter
Environment Condition
Weight
Dimensions(mm)
Reliability

3-3 Printer Mecha Specifications

3-3-1 Printer Mecha Specification

Item Description Remark 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
Connector • 30P (Dot Head, Sensor Signal, Motor Control and Power Input)
Head Life • Approx. 300 million Dots / Wire Weight • Under 650g (Excluding Ribbon Cassette, Auto Cutter)
• 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
• 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
• 5V ± 10% : Home Sensor, Motor Driver IC
• LIFE : Approx.20 Million Print Lines
External ROM Version
The Flow Control, Baud Rate, Stop Bit and Parity are determined by DIP S/W position.
Packing Unpacking
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SRP-270

3-3-2 Character Specification

Item Description Remark
Dot Interval
Font Type ASCII Chinese Print Font 9 x 9 7 x 9 16 x 16 Printing Columns 33 40 - Character Size (mm) 3.2 x 1.7 3.2 x 1.4 5.7 x 3.0 Column Interval (mm) 2.13 1.59 3.19 Line Interval 1/6“ 1/6“ 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 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- -
GND -
H 0.3175 mm V 0.3528 mm
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SRP-270

3-3-4 Printer Head Specification

Item Description Remark
Model • DH400-G10
Specification
Solenoid Coil
Driver Circuit
Performance
Temperature

3-3-5 Printer Head Thermistor Specification

Item Description Remark
Type
Electronic Characteristics
Max Operating Limit
Rx Formula • RX = R25 x Exp {B x (1/TX -1/T25) ]} T : Absolute Temperature

3-3-6 Feed & Carriage Motor Specification

Item Description Remark 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 Remark Model • ORC-RUG80-2 (OHYANERIKI MFG. Co., Ltd) Type • Guillotine Type Motor • DC Brush Motor Fk-180SH-12280 Mabuchi Motor Voltage • 24VDC ± 10% Current • 400 mA (Average), 1.6 A (Peak)

3-3-8 Paper Specification

Item Description Remark Paper Type • Roll Paper Paper Roll Width • W76 ± 0.5 mm (2.99” ± 0.00200”) Paper Roll Diameter • Max x ø 83mm (3.26”)
Normal Paper
• Type: Ballistic Type (Free Fight)
• Number of Wire: 9Pin
• Resistance: 10W ± 15%
• Inductance: 4.5mH ± 15% (Open Circuit)
• Temperature Rate: 155 Deg.C
• Insulation Resistance: 10MW
• Type: constant Voltage
• voltage: 24VDC ± 5% (Normal ) (At Printer Head)
• Current: 1.3 A
• Pulse: 330μ Sec (Head On Time)
• Fly Back Voltage: 48VDC (Min)
• Platen Gap: 0.51 ± 0.1 mm
• Max Frequency: 1500 Hz
• Forms Capability: Original + 2 Copies
• Max Operating Temp: 65°C
• Max Transient Temp: 140°C (For 5 Minutes)
• LP310-1J (Tama Elec. Co., Ltd) or Correspond to it correspond to it
• Resistance R25: 17.3 KW (At 25°C)
• B Value: 3950K ± 2
• Operating Temp: 120°C ~ 150°C
• Time Constant: Max 30 sec (In the air)
• Thickness: 1 Sheet 0.06~0.085mm
(0.0028 ~ 0.0034”)
• Weight: 52.3 ~64 g/m2 (0.115 ~ 0.1411 lb)
Any thermistor which correspond to it
- 20 -
Page 21
SRP-270

3-3-9 Ribbon Cassette Specification

Item Description Remark 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

3-3-10 Other Component Specification

Item Description Remark Paper End Sensor • Reflection Type Micro Switch Paper Roll Near End Sensor
750,000 Character (Red)
(Continuous Printing 7 x 9 Font / ASCII / 25 )
• Micro Switch Factory option

3-4 SMPS Specifications

3-4-1 SMPS (Switching Mode Power Supply) Specification

Item Description Remark 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
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Page 22
SRP-270

3-5 Interface Specifications

3-5-1 RS-232C Serial Interface

3-5-1(a) Specification
Item Description Remark Data Transmission • Serial Synchronization • Asynchronous HandShaking (Flow Control)
Signal Level
Baud Rate • 19200 / 2400 / 4800 / 9600 Bps Data Word Length • 7 Bit / 8 Bit Parity • None / Even / Odd Connector • DB25P Female (I/F PBA)
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
• H/W : DTR / DSR
• S/W : XON / XOFF
• Logic”1” (MARK) : -3V ~ -15V
• Logic”0” (SPACE) : +3V ~ +15V
Table 3-14 RS-232C Specification
XON: ASC Code 11h XOFF: ASC Code 13h
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
CONN : User Spec In Case PC : D-SUB25P-Female or
D-SUB9P-Female
- 22 -
Page 23
3-5-1(c) Cable Connection
SRP-270
PRINTER
SIDE (25P)
3-5-1(d) Signal Description
Pin No. Signal name Direction Function
1 FG - Frame Ground 2 TxD Output Transmit Data 3 RxD Input Receive Data 4 RTS Output Ready To Send 5 CTS Input Clear To Send
6 DSR Input
7 SG -
20 DTR Output
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.
HOST
SIDE (25P)
Figure 3-7 RS-232C Cable Connection
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.
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.
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
PRINTER
SIDE (25P)
HOST
SIDE (9P)
- 23 -
Page 24
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 Description Remark Data Transmission • Serial Synchronization • Asynchronous HandShaking (Flow Control)
Signal Level
Baud Rate • 19200 / 2400 / 4800 / 9600 Bps Data Word Length • 7 Bit / 8 Bit Parity • None / Even / Odd Connector • DB25P Female (I/F PBA)
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
• 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
Table 3-16 RS-485 Specification
XON: ASC Code 11h XOFF: ASC Code 13h
PRINTER
SIDE
Figure 3-8 RS-485 Cable Connection
- 24 -
HOST
SIDE
Page 25
SRP-270
3-5-2(d) Signal Description
Pin No. Signal name Direction Function
1 Frame GND - Frame Ground 2 SD2 Output 3 SD1 Output 4 RD2 Input 5
7 SGND - Signal Ground
8 9
10 11
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
Data Transmission • 8-bit Parallel Synchronization • External supplied nStrobe signals HandShaking • nACK and Busy signals Signal Level • TTL compatiable Connector • Centronics 36P
RD1 Input
DR2 DR1
CS2 CS1
Item Description Remark
Output
Input
Send Data ”H” : SD1 > SD2 , “L” : SD1 < SD2
Receive Data ”H” : RD1 > RD2 (RD1-RD2 0.2V) “L” : RD1 < RD2 (RD1-RD2 0.2V)
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.
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)
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
Table 3-18 IEEE1284 Specification
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Page 26
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 Byte Mode
1 Host nStrobe HostClk HostClk 2 Host / Printer Data 0 (LSB) - Data 0 (LSB) 3 Host / Printer Data 1 - Data 1 4 Host / Printer Data 2 - Data 2 5 Host / Printer Data 3 - Data 3 6 Host / Printer Data 4 - Data 4 7 Host / Printer Data 5 - Data 5 8 Host / Printer Data 6 - Data 6
9 Host / Printer Data 7 (MSB) - Data 7 (MSB) 10 Printer nAck PtrClk PtrClk 11 Printer Busy PtrBusy/Data3,7 PtrBusy 12 Printer Perror AckDataReq /Data2,6 AckDataReq 13 Printer Select Xflag/Data1,5 Xflag 14 Host nAutoFeed HostBusy HostBusy 15 NC ND ND 16 GND GND GND 17 FG FG FG 18 Printer Logic-H Logic-H Logic-H
19~30 GND GND GND
31 Host nlnit nInit nlnit 32 Printer nFault nDataAvail /Data0,4 nDataAvail 33 GND ND ND 34 Printer DK_Status ND ND 35 Printer +5V ND ND 36 Host nSelectln 1284-Active 1284-Active
Table 3-19 IEEE1284 Pin Description
3-5-3(c) IEEE1284 I/F Cable
Host Side
Printer Centronics
Side 36P
Figure 3-9 IEEE1284 Cable
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SRP-270

3-5-4 USB2.0 Interface

SRP-270 support the USB (Universal Serial Bus) Serial Communication.
3-5-4(a) Specification
Item Description Remark
Transfer Type • BULK
Data Signal
Data Format
Transceiver
Speed • 12 Mbps Power • Self-Powered
Cable & Connector
Other • Support USB SPEC V1.1
3-5-4(b) Signal Description
Pin No. Signal Name Assignment(Color) Function
Shell Shield Drain Wire Frame Ground
1 VBUS Red Host Power : DC5[V] / 500[mA] 2 D- White Differential Data Line 3 D+ Green Differential Data Line 4 GND Black Signal Ground
3-5-4(c) USB I/F Cable
• 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]
• Cable : 5m / 2m
• Connector : B Type
Table 3-20 USB Specification
Table 3-21 USB Pin Description
Figure 3-10 USB A-B Type Cable
- 27 -
Page 28
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. Description Direction
1 Frame GND ­2 Cash Drawer Driver Signal #1 Output 3 Drawer Open / Close Signal Input 4 +24V ­5 Cash Drawer Driver Signal #2 Output 6 Signal GND -
Table 3-23 Cash Drawer Cable Connection
※ Note : +24V is always output through pin 4 during power on.
- 28 -
Page 29

4. Hardware

4-1 Wiring Diagram

SRP-270
[Figure 4-1 Board Wiring Diagram]
- 29 -
Page 30

4-2 Block Diagram

SRP-270
[Figure 4-2 Block Diagram]
- 30 -
Page 31
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. VOLTAGE DESCRIPTION
1 +24VDC Cash Drawer Solenoid Driving / Step Motor Voltage 2 +5VDC 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.
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Page 32
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]
- 32 -
Page 33
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]
- 33 -
Page 34
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 DIP_C1 DIP_C2 DIP_C3
RS-232C L L H
RS-485 L H L
IEEE1284 H L L
USB2.0 H H L
No Connection L L L
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Page 35
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]
- 35 -
Page 36
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]
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Page 37
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]
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Page 38
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)
R5
[Figure 4-12 DIP Switch Block Diagram]
R5
- 38 -
Page 39
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.
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Page 40

5-3 Cover Assy (SRP-270D Type)

1. Open the Cover Assy and take out the Spool Winding, as shown below.
SRP-270
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. 2. Pull the Cover Assy upward and remove it.
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Page 41
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.
- 41 -
Page 42

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.
SRP-270
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)

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)
2. Remove two screws securing the Printer Assy. Separate the Printer Assy from the Case Lower.
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Page 43

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)
2. Remove the Spool Gear and Belt, as shown below.(SRP-270D Type)
SRP-270
3. Remove two screws securing the Printer Assy. Separate the Printer Assy from the Case Lower.

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.
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Page 44

5-10 Main PCB

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

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.
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Page 45
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
• 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.
3
4
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.
• 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.
Description Points in Adjustment
- Appropriate gap: 0.50~0.60mm
- In order to make the gap narrow (wide), turn Ad. Lever to mark ’-(+)’
- If gap is not correct, repeat once more.
(Replacement of Head unit)
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Page 46

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.
SRP-270
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Page 47

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.
SRP-270
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Page 48

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
SRP-270
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)
Print speed
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.
7×9 font (400 half-dot positions per line) 9×9 font (400 half-dot positions per line)
Approximately 4.6 lines/second (40 columns, 16cpi) Approximately 8.4 lines/second (16 columns, 16cpi)
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Page 49
SRP-270

8-1-2 Character specifications

8-1-2-1 Character sets
Item Description
Alphanumeric 95
International 32
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
7 × 9
9 × 9
7 × 9
9 × 9
NOTE: The default font is 7×9; the dot spacing between characters is either 3 half dots or 2 half
dots, depending on programming.
Character
structure
Character Set
ANK
Graphics
ANK
Graphics
ANK
Graphics
ANK
Graphics
Character
Dimensions
W x H
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
3 half dots 40 16
0 40 16
3 half dots 33 13.3
0 33 13.3
2half dots 42 17.8
0 42 17.8
2half dots 35 14.5
0 35 14.5
Characters Per
Line (cpi)
Characters Per
Inch (cpi)
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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
Normal paper
Pressure-sensitive paper
Unless there is an optional near-end detector, you cannot use a paper roll with the core and paper glued together.
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)
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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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
("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 Description
Temperature
Black: 1.5million characters {with continuous printing at 25 (77°F)} Red: 750,000 characters {with continuous printing at 25 (77°F)}
Operating: 0°to 40 (32°to 1 04°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
* 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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8-1-6 Reliability

Item Description
MCBF

8-1-7 Main Unit specifications

Paper Feed Motor
This is an average failure interval based on failures relating to wear out and random failures up to the life of 18 million lines.
Item 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
Carriage Motor
Print Head Unit
Home Position Sensor
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
Number of solenoids 9
Winding resistance 9.5±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.
Peak: 1.5 A in maximum Average: 400mA at 24 VDC, 25 (77°F), 570mA maximum
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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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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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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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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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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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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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* 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 ]
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 This area is consisted of 3 region
(Accelerating area of left side[30T] + constant speed area[6T] + vertical alignment adjustable time[3T])
400T (printing area, when printing 40 characters of 7×9 font, space between one character and
another one is 3T)
421T(printing area + decelerating area of right side[24T])
- Printing area includes part of right side area 24Step - Paper feeding area 24T - Distance until outing of head pin when printing from right to left 400T - Printing area 436T - Printing area + decelerating area of right side The start position of head carria ge tip On uncovering of home sensor When outing the first head pin When paper is feed
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[ Description of Timing chart.2 ]
When head carriage step motor stops(left left) The start position of head carriage step motor from right to left When fir st 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 colo r-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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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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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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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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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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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 No Lubrication Point Oil type
1 2 3 4 5 6 7 8
* 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 Adhesive Application Point Adhesive Type 12 Volume resistance adjustment of main PCB Screw lock
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
HG-31S HG-31S HG-31S HG-31S HG-31S
G948P HG-31S HG-31S
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8-5 Tools, Lubricants and Adhesives

8-5-1 List of Tools

No Tool Designation Availability
1 2 3 4 5 6 7 8
9 10 11

8-5-2 List of Lubricants and Adhesives

Item Oil Grease Adhesive
Description CALTEX REGAL R/D #68, 948P HG-31S 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
2) Level B: Requires full knowledge and technical skills regarding the operating principles and construction of

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.
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
construction of the printer, but does not require previous repair experience.
the printer as well as previous repair experience.
O O O O O O O O O O O
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8-6-3 Repair Guidelines

Phenomenon Condition Cause Level Check point & Method Repair Method
1. Motor
does not rotate
2. No dot
printing is performed
Motor does not rotate despite printing command has been given
Motor rotates normally but no dot printing is performed
Defective power input to motor
Defective motor drive signal
Damaged or Improper connection between motor terminals of the connector
Defective motor
Occurrence of paper jam
Head FPC
is disconnected from it connection
Broken
common lead in head FPC
Common
lead between the head FPC and connector is broken
Defective
timing detector sub Assy
B ·Check the input
power
·Check the input voltage (24V±2V) between the motor terminals of the connector using a tester or oscilloscope
B ·Check input signal
·Check if the signal is being input to the motor drive terminal of the connector using an oscilloscope
B ·Check the conductivity
between the pertinent terminals
B ·Apply 24V to the
leads of the motor then check the rotation (red: + black: -)
A ·Check the deformation
of Head pin guide or platen paper guide
B ·Check if the head FPC
is properly inserted into its connector
B ·Check the conductivity
between the common lead of head FPC and other terminals (20±10%)
A ·Check the conductivity
of the common lead section
·Check the voltage (28V±2V)
B ·Observe by
oscilloscope to check if a timing signal is being generated
·Inspect and repair
·Replace the
·Replace the main
·If improperly
·Replace the
·Replace Head
·If not, securely
·Replace the head unit, if there is no conductivity
·Replace the main
·Replace the timing
the power supply circuit
drive signal generating circuit
circuit board Assy if there is no conductivity
connected, reconnect the pertinent leads in the proper manner
motor, if it does not rotate
pin guide or platen paper guide if they are deformed or destroyed
reinsert the head FPC
circuit board Assy if there is no conductivity or 28V
detector sub Assy, if no timing signal is being generated
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Phenomenon Condition Cause Level Check point & Method Repair Method
2. No dot printing is performed
3. Missing of Head dots
4. Missing of Dot Head
Motor rotates normally but no dot printing is performed
Only specific dots are never printed
All of date are not printed
Defective
input charge pulse
Positional
relations-hip between head and the platen
Damaged
lead in head FPC
Lead
breakage between connector and FPC terminals
Damaged
lead of a dot driving coil
Defective
timing detector sub Assy
Defective
input charge pulse
Defective
contact of the Head FPC
Malfunction
of the Head unit
Defect ive
Timing detector Assy
Defective
input charge pulse
B ·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
B ·Check if the gap
between the Platen and the tip of head is correct correct value :
0.51±0.1mm
B ·Check the conductivity
between the pertinent common lead of the head FPC and other terminal
B ·Check the conductivity
between the pertinent terminals
B ·To check if the
resistive value of the pertinent dot driving coil is within rated values, measure the resistance of the terminal between connectors Rated value : 20Ω±10%
B See cause of phenomenon 2
B See cause of phenomenon 2
A See cause of phenomenon 3
B ·Check if paper dust is
caught in the tips of the head pin
B See cause of phenomenon 2
B See cause of phenomenon 2
·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
·If the resistance is
outside rated values, replace the head
·If the paper dust is
caught, remove it
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Phenomenon Condition Cause Level Check point & Method Repair Method
5. Intermittently defective character width
6. Motor rotation does it stop
7. Paper is not feed
Intermittent changes in character width
All Printing is done at one line without the paper being feed
Wear or
damage of Lead Cam or the gear
Defective
input charge pulse
Defective
R·L reset detector sub Assy
Defective
motor drive signal
Defective
paper supply
Detect in
step motor
In proper
connection or damage of terminal connector in step motor, or cutting of wise or damaged connected part
Occurrence
of paper jam
Wear or
damage of the teeth of the gears
Wear of the
Rubber Roller
Deformation
of the spring Roller
The Shaft
Roller rotates malfunction
Turning
direction of Gear
A ·Check the teeth of
each gear and of the Lead Cam for wear and damage
B
See cause of phenomenon 2
B ·Use an oscilloscope to
check if a signal is generated from of the R(L) reset detector sub Assy by rotating the Lead Cam
B
A ·Check the width,
length and thickness of the paper
·Check the paper feeding path
B ·Apply 24V to motor
and check to turn
B ·Check flow of
electricity between Pertinent terminal
A See cause of phenomenon 1
B ·Check the gear for
wear or damage
B ·Check the surface of
the Rubber Roller for wear
B ·Check if the Shaft
Roller has become deformed
B ·Check to be
something in Gear and to be well touched
B ·Check to be
something in gear and to be well touched
See cause of phenomenon 1
(Check input signal stop high)
·If worn or damaged, replace the defective gear or the Lead Cam
·Replace the R(L) reset detector sub Assy if no signal is generated
·Use the standard
paper
·Repair each supply
mechanism so that paper supply is smooth
·Check the end part of paper
·Substitute if motor is not in turning
·In case of no flow of
electricity, 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
·If there is wear or damage, replace the pertinent gear
·If the Rubber Roller is worn, replace it
·If deformed, replace it with a new spring
·If deformed, replace the pertinent Shaft Roller
·Remove dusts removed wire
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Phenomenon Condition Cause Level Check point & Method Repair Method
8. Uneven paper feeding pitch
9. Ribbon mechanism does not function
10. Defective paper insertion
11. No working on ribbon shifting
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
Defective
paper supply
Deformation
of the Spring Roller
Wear of the
Rubber Roller
The Shaft
Roller rotates malfunction
Wear or
damage of the teeth of the gears
Deformation
of the Platen Paper Guide 710
Bad turning
of gear
The ratchet
of Ribbon Cassette is damaged or worn out
Wear or
damage of the teeth of the gears
Other
substances may exist in paper passing track
Method of
paper insertion
Betraying
from damage or transforming of spring solenoid
B ·Check betraying from
Attrition or
damage of shift cam shift
A See cause of phenomenon 1
B See cause of phenomenon 1
B See cause of phenomenon 1
B See cause of phenomenon 1
B See cause of phenomenon 1
B ·Check if Platen Paper
Guide has become deformed
A See cause of phenomenon 1
A ·Check whether the
ratchet of Ribbon Cassette is damage or worn out
A ·Check ribbon feed
Assy and gear reduction a, b, c for wear of damage
B ·Check if other
substance may exist in paper passing track
A ·Check if paper is
inserted according to the method described
B ·Check betraying or
damage, transform of spring solenoid
spring shift clutch and damage and transform of it
·Measure exterior diameter of spring shift clutch and check with eyes
·If deformed, replace it with a new platen Paper Guide
·Replace it if damaged or worn out
·If there is wear or damage, replace it
·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
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SRP-270
Phenomenon Condition Cause Level Check point & Method Repair Method
12. No working of Solenoid
13. No working of ribbon rotating
Entry of
solenoid is cut
Gear tooth
cam, ratchet and ribbon frame get dusted or altered
Transforming
or damage of spring shift clutch
Attrition or
damage of shift cam, shift ratchet
Transform or
damage of ribbon frame
Betray of
ribbon papers
Volume of
ribbon
B ·Measure resistant
value between terminal of solenoid resistance: Some 70±10% (25 )
A ·Check with eyes
transforming or dusting in gear tooth, cam, ratchet, and ribbon frame
B See cause of phenomenon 12
B See cause of phenomenon 12
B ·Measure size of the
part moving cam of ribbon frame, measure horizontal degree and check with eyes
A ·Check with eyes
ribbon paper in ribbon frame
A ·Different with each
other of color and rate of ribbon
·In case cutting substitute solenoid
·Substitute dust to take out or part
·In case of transform or damage of ribbon frame, substitute them
·Set ribbon paper fit ably with ribbon frame
·Ribbon substitute
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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 Description P/N In or Out Description
1 Output head #6 16 Output ground 2 Output head #8 17 Output ground 3 Output head #4 18 Input head carriage control sig 4 Output head #9 19 Output CA 5 Output head #2 20 Output CB 6 Input head com 24V 21 Input Vcc(5V) 7 Input head com 24V 22 Input Vcc(5V) 8 Input head com 24V 23 Input paper feed control sig
9 Output head #3 24 Output PA 10 Output head #5 25 Output PB 11 Output head #1 26 Output home send output 12 Output head #7 27 Output paper end output 13 Output thermistor 28 Input 24V 14 Output ground 29 Input sol +(24V) 15 Output ground 30 Output sol -
8-6-4-2 Connector 14pin
* Connector: Head control * Model: Mechanism side : GF120-14S-Ls
[LG cable co.]
P/N In or Out Description
1 Output thermistor (-)
2 Input thermistor (+)
3 Output head #7
4 Output head #1
5 Output head #5
6 Output head #3
7 Input com(24V)
8 Input com(24V)
9 Input com(24V) 10 Output head #2 11 Output head #9 12 Output head #4 13 Output head #8 14 Output head #6
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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 Explanation
WBH Washer faced Binding Head Screw
PH Pan Head machine screw
WPH Washer faced Pin Head Screw T/T PH Pan Head Taptite screw T/P PH Pan Head Tapping Screw
PW Plain washer
WW Wave Washer
PSW Poly slide washer with slit
SP Spring pin RE Retaining ring type-E PP Parallel pin
FS Franged Screw
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Page 75
SRP-270

8-8-1 Sub-assemblies

8-8-1-1 Carriage Head Assy
Name of Parts Method and Procedure Drawings
BE RIN G FE (2ea) CARRIAGE HEAD
8-8-1-2 Lever Ribbon Feed Assy
Name of Parts Method and Procedure Drawings
SHAFT REDUCTION “B” LEVER RIBON FEED GEAR REDUCTION “B” WAVE WASHER E⑤ -RING (ø2.5)
1. At first, set the BERIN 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 CARRIAGE HEAD
to be inserted into the shaft of JIG.
3. Next , set other BERIN G FE to be
inserted into the shaft of JIG.
* Notice: The direction of insert is to
locate frange upward.
4. Lastly, insert two BERIN G FE in the CARRIAGE HEAD by pushing the handler of Lever Press.
< Check Point>
Check improper insertion of BERIN G FE and fraction of CARRIAGE HEAD.
1. At first, Grease SHAFT on the ①②
LEVER RIBBON FEED with HG­31S.
2. And then, Assemble ④WAVE WASHER and Grease WAVE WASHER.
3. Last, assemble GEAR REDUCTION “B” and E⑤ -RING (ø2.5).
8-8-1-3 Ribbon Feeder Assy
Name of Parts Method and Procedure Drawings
SPRING RIBBON FEEDER RIBBON FEEDER GEAR R IBBON FEEDER
1. Grease SPRING RIBBON FEEDER with HG-31S and insert that into RIBBON FEEDER.
2. And then, insert GEAR RIBBON FEEDER to fit the section of hook.
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SRP-270
8-8-1-4 Lever Tension Belt C Assy
Name of Parts Method and Procedure Drawings
SHAFT PUL LEY LEVER TENSION BELT PULLEY WASHER (2.6*5.0*0.5)
8-8-1-5 Sub PCB Assy
Name of Parts Method and Procedure Drawings
SUB PCB SWITCH LEVER WIRE ASSY
8-8-1-6 Cover Head Assy
Name of Parts Method and Procedure Drawings
COVER HEAD SCREW MANUAL E③ -RING (ø2.5) CAUTION LABEL
1. At first, grease SHAFT PULLEY with HG-31S.
2. Next insert PULLEY and then assemble WASHER (2.6*5.0*0.5).
<Check Point>
Check PULLEY to rotate smoothly.
1. Insert SWITCH LEVER to fit the
hole of SUB PCB.
2. And then, solder the land on the
SUB PCB bottom side and attach
the WIRE ASSY on the land A, G.
<Check Point>
After soldering, check the frozen lead
and short.
1. Insert the SCREW MANUAL into
the right side hole of COVER HEAD.
2. And then, assemble E③ -RING onto the starting point of a spiral during adhering closely to the COVER HEAD.
3. Paste the CAUTION LABEL on the right bottom side.
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SRP-270
8-8-1-7 Bracket PF “R” Assy
Name of Parts Method and Procedure Drawings
BRACKET P/F “R” GEAR PF IDLE GEAR KNOB GEAR KNOB IDLE WASHER (1.6*3*0.3)
8-8-1-8 Platen Assy
Name of Parts Method and Procedure Drawings
PLATEN PLATE TAPE D/F PLATEN
1. At first, grease the small shaft of
BRACKET P/F “R” with EM -501.
Next, insert GEAR PF IDLE,
GEAR KNOB, and GEAR ③④
KNOB IDLE. Lastly, assemble
WASHER.
2. Grease the outer diameter of gear with EM-501.
<Check Point>
Check GEAR KNOB to rotate
smoothly.
1. Paste the TAPE D/F onto the
PLATEN PLATE and set the sub
Assy into the rectangular hole of the exclusive JIG.
2. Set the PLATEN to fit the groove of JIG and paste by pushing.
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Page 78
SRP-270

8-8-2 Main-assemblies

8-8-2-1 Base Paper Feed Assy - #1
Name of Parts Method and Procedure
BASE PAPER FEED SHAFT TAKE UP TAPE CUSION RUBBER PLATE (2EA) PLATEN ASSY SCREW SPECIAL (M2.6*7.5, 2EA) SHAFT RUBBER ROLLER ROLLER PAPER GUIDE (2EA) BEARING (2EA) E-RING (ø3, 2EA) GEAR ROLLER BRACKET PF R ASSY STEP MOTOR PF SCREW TAPPING (M3*6, 2EA)
1. At first, set BASE PAPER FEED in the JIG. Next, insert SHAFT TAKE UP into the hole. Lastly, press it by Lever
Press.
2. Set TAPE CUSION to fit rectangular hole of BASE ③①
PAPER FEED and then, insert RUBBER PLATE in both side.
3. Insert PLATEN ASSY into the rectangular hole and then,
tighten two SCREW SPECIAL.
4. Make BASE PAPER FEED st and(right side), and then,
insert two ROLLER PAPER GUIDE and BEARING to fit ⑧⑨
SHAFT RUBBER ROLLER in both side one by one. Next,
fix the Sub Assy into the back face of BASE PAPER FEED and fit two E⑩ -RING into the groove each other.
5. Set GEAR ROLLER on to right side shaft of BASE
PAPER FEED and then set BRACKET PF R ASSY.
6. Insert STEP MOTOR PF into the rectangular hole of
BRACKET PF and drag backward. Next, tighten two
SCREW TAPPING on BRACKET PF R ASSY.⑭⑫
<Check Point>
Check ROLLER to rotate smoothly.
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SRP-270
8-8-2-2 Base Paper Feed Assy - #2
Name of Parts Method and Procedure
GEAR TAPE UP GEAR TU PULLEY WASHER BELT GUIDE WASHER (2.6*5*0.5) BRACKET PF L SCREW TAPPING (M3*6, 6EA) GUIDE PAPER A GUIDE PAPER B
1. Make BASE PAPER FEED stand (left side), and then, insert GEAR TAPE UP to fit SHFAT(D -CUT) (long side is
downward). Next, grease SHFAT and teeth of GEAR with HG­31S.
2. Set GEAR TU PULLEY onto SHAFT and insert WASHER
BELT GUIDE. Next fix with WASHER.
3. Set BRACKET PF L onto BASE PAPE R FEED boss, and
then, tighten two SCREW TAPPING.
4. Rotate BASE PAPER FEED and set GUIDE PAPER A to
the back face, and then, tighten two SCREW TAPPING step by step.
5. Make BASE PAPER FEED stand and set GUIDE PAPER B
to it, and then, tighten two SCRE W TAPPING step by step.
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Page 80
SRP-270
8-8-2-3 Base Paper Feed Assy - #3
Name of Parts Method and Procedure
SUB PCB ASSY SCREW TAPPING (M2*3, 2EA) MANUAL CUTTER SCREW (M3*6, 2EA) PLATEN PAPER GUIDE SHAFT HOLE ROLLER HOLE ROLLER (2EA) SPRING HOLD ROLLER (2EA)
1. Set SUB PCB ASSY to fit the hole in the bottom face of
BASE PAPER FEED and tighten two SCREW TAPPING.
2. Set the MANUAL CUTTER to the boss on the BASE
PAPER FEED and tighten two SCREW.
3. Hook PLATEN PAPER GUIDE on the manual cutter in the
front face of BASE PAPER FEED.
4. Grease section of SHAFT HOLE ROLLER mounted HOLE
ROLLER and insert two HOLE ROLLER . Next, set SHAFT to the each groove of BASE PAPER FEED as fitting HOLD ROLLER into PPG.
5. Hook two SPRING HOLD ROLLER on the both side of
BASE PAPER FEED.
<Check Point>
Check the location of PLATEN PAPER GUIDE, status of hooking, coming off.
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SRP-270
8-8-2-4 Main assembling - #1
Name of Parts Method and Procedure
FRAME MAIN C/K ASSY-4 SERIAL NO. TAG TAPE INSULATION LEVER COLOR CHANGE SOLENOID ASSY SPRING SOLENOID SCREW MACHINE (M2*3) GEAR PULLEY ASSY
WASHER (ø2.6*5*0.5) LEVER TENTION BELT ASSY SCREW (M3*4)
1. Set FRAME MAIN C/K ASSY -4 on the JIG.
2. Paste SERIAL NO. TAG in the right side and TAPE ②③
INSULATION on the bending line in the bottom face.
3. Grease SHAFT(6 point) with HG-31S.
4. Insert LEVER COLOR CHANGE into SHAFT in the left
bottom side and fit WASHER(2.6*8*0.5).
5. Turn SOLENOID ASSY and SPRING SOLENOID
downward and insert it into the hole of LEVER C/C and M/F side step by step. Next, tighten SCREW MACHINE.
6. Insert GEAR PULLEY ASSY and then, fit WASHER .
7. Insert LEVER TENTION BELT ASSY to the hole and then,
tighten SCREW two-third.
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SRP-270
8-8-2-5 Main assembling - #2
Name of Parts Method and Procedure
GEAR REDUCTION A GEAR REDUCTION B RIBBON FEEDER ASSY GEAR REDUCTION “C” LEVER RIBBON FEED ASSY WASHER (ø 2.6*5*0.5, 2EA) MAIN PCB ASSY FPC CONNECTOR SCREW MACHINE (M3*4) CARRIAGE HEAD ASSY BELT SYNCHRONUOS SPRING LEVER TENSION BELT
1. Set FRAME MAIN on the JIG.
2. Set GEAR REDUCTION A, GEAR REDUCTION B , RIBBON FEEDER ASSY and GEAR REDUCTION "C"
onto SHAFT sequentially. Grease teeth and upper face of RIBBON FEED ASSY.
3. Insert LEVER RIBBON FEED ASSY and WASHER .
4. Attach FPC CONNECTOR to MAIN PCB A SSY. Next,
plug SOLENOID WIRE (block) in connecter 2p. And then, set it to M/F and tighten two SCREW MACHINE .
5. Insert BELT SYNCHRONUOS into CARRIAGE HEAD
ASSY, and then, belt up round PULLEY and GEAR PULLEY.
6. Hoot SPRING LEVER TENSION BELT .
<Check Point>
Check the tear of FPC.
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SRP-270
8-8-2-6 Main assembling - #3
Name of Parts Method and Procedure
AD LEVER SHAFT HEAD GUIDE SHAFT HEAD CARRIAGE E-RING (ø 3) HEAD PRINT SCREW (M3*10, 2EA) BRACKET HEAD COVER “L” BRACKET HEAD COVER “R” SCREW MACHINE
(M2.6*3, 2EA)
8-8-2-7 Main assembling - #4
Name of Parts Method and Procedure
BASE PAPER FEED ASSY SCREW MACHINE
(M3*6, 3EA)
STEP MOTOR H/F SCREW (M3*4, 2EA) RIBBON FRAME SPRING RIBBON FRAME E-RING (ø3, 3EA) HEAD COVER ASSY
1. Set FRAME MAIN on the JIG.
2. Insert AD LEVER in the left side and then, turn to the downward. Next insert the other AD LEVER into SHAFT HEAD GUIDE and insert the Sub Assy into F/M from right to left and then, turn AD LEVER downward.
3. Insert SHAFT HEAD CARRIAGE from left to right and fit E④ -RING in the left side.
4. Insert FPC into HEAD PRINT and set HEAD Assy to CARRIAGE HEAD, and then tighten two SCREW .
5. Tighten the screw mounted to LEVER TENTION BELT ASSY completely.
6. Fit BRACKET HEAD COVER "L" and BRACKET HEAD COVER "R" to both boss and then tighten two SCREW MACHINE .
1. Set FRAME MAIN on the JIG.
2. Put BASE PAPER FEED ASSY wire into the rectangular hole and drag it. Next, set BASE PAPER FEED ASSY and tighten three
SCREW MACHINE .
3. Turn up FRAME MAIN and then set STEP MOTOR H/F to the hole. Next, tighten two SCREW .
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 SPRING RIBBON FRAME on the RIBBON 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 E⑦ -RING. And assemble HEAD COVER ASSY .
<Check Point> Check the setting position of RIBBON FRAME and jam.
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SRP-270
8-8-2-8 Main assembling - #5
Name of Parts Method and Procedure
RIBBON FRAME SPRING RIBBON FRAME E-RING (ø3, 3EA)
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.
a
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Page 85
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
• 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.
3
4
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.
• 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.
Description Points in Adjustment
- Appropriate gap: 0.50~0.60mm
- In order to make the gap narrow (wide), turn Ad. Lever to mark ’-(+)’
- If gap is not correct, repeat once more.
(Replacement of Head unit)
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