Epson TM-U675, TM-U675P Service manual
Confidential
Service manual
TM-U675/U675P
(with MICR)
Issued Date 199 , ,
Issued by
EPSON
English
401093600
Confidential
TM-U675/675P (with MICR) Service Manual
CONFIDENTIALITY AGREEMENT
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or any consumable products other than those designated as Original EPSON Products or EPSON Approved
Products by Seiko Epson Corporation.
®
EPSON
and ESC/POS® are registered trademarks of Seiko Epson Corporation
Rev. A i
Confidential
Contents
Confidentiality Agreement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i
For Safe Repair and Maintenance Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi
Key to Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi
Safety Precautions on Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi
Safety Precautions on Maintenance/Repair/Inspection . . . . . . . . . . . . . . . . . vii
Note on Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii
Modular Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii
About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
Aim of the Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
Manual Content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
Chapter 1
Before Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Diagnosing Failures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Symptoms and Solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Printer Mechanism Power on Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Opening and Closing the Platen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Detecting the Head Carriage Home Position . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Starting and Stopping Self Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Printing Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Ending the Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
MICR Reader Test (Only with Printers that Have a MICR Unit.) . . . . . . . . . . 1-7
Troubleshooting Using the ERROR LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Test Points on the Printer Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
Test Points on the Main Circuit Board Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
Power Supply Line Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
Locations of the Main Elements on the Main Circuit Board Unit . . . . . . . . . . . . . . 1-15
Procedures for Replacing the Print Head Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
Removing Paper Jams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
Using the Release Lever . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
Opening the Clamshell Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
Detector Functions and Positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
Chapter 2
Before Assembly and Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
About this Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Titles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Quick Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Assembling the Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Pre-assembly Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Assembly of the Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-38
Assembling the TM-U675 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-73
Pre-assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-73
Assembly of the TM-U675 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-75
Troubleshooting
Assembly and Disassembly
Chapter 3
Before Making Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
The Purpose of Adjusting and Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Adjusting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Phase Adjusting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Adjusting the Platen Gap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Setting Threshold Values for Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Adjusting and Setting
ii Rev. A
Confidential
TM-U675/675P (with MICR) Service Manual
Appendix A
Appendix B
Maintenance and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Daily Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Periodic Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
MICR Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3
Cleaning Sheet Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3
Procedures for Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3
Appendix C
Connecting to the Host PC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
Connecting the Drawer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2
Connecting to a Direct Connection Display Module . . . . . . . . . . . . . . . . . . . . . . . . C-3
Power Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-4
Appendix D
Component Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1
Outline of Printer Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-2
Printing Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-2
Detection Mechanism Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-7
Roll Paper Feed Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-15
Slip Feed Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-25
Validation Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-29
Ribbon Feed Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-29
MICR Mechanism (Option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-31
Outline of Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-34
Connection of Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-34
Circuit Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-35
Memory Circuit Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-36
Main Circuit Board Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-37
CPU and Peripheral Logic Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-39
Slip Mechanism Drive Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-50
Input Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-60
Control Panel Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-63
Malfunction Protective Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-64
Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-65
Important Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-66
DIP Switch Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-67
Serial Interface Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-67
Parallel Interface Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-69
Self Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-70
Outline of Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-71
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-71
Printer Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-72
MICR Reader (Factory Option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-74
Overall Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-75
Interface Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-76
Service Tools and Lubricants
Maintenance
Installation
Product Overview
Appendix E
Alphanumeric List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1
Reference Number List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-9
Parts List
Rev. A iii
Confidential
Appendix F
TM-U675/U675P . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-1
Mechanism Assembly (without MICR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-2
Mechanism Assembly (with MICR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-3
Frame Assembly (without MICR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-4
Frame Assembly (with MICR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-5
Carriage Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-6
PF Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-7
MICR Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-8
Appendix G
TM-U675/U675P . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-1
Mechanism Assembly (without MICR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-2
Mechanism Assembly (with MICR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-3
Frame Assembly (without MICR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-4
Frame Assembly (with MICR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-5
Carriage Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-6
PF Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-7
MICR Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-8
Appendix H
Main Circuit Board Assembly (Outline) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . H-1
Main Circuit Board Assembly (1 of 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . H-2
Main Circuit Board Assembly (2 of 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . H-3
Main Circuit Board Assembly (3 of 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . H-4
Main Circuit Board Assembly (4 of 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . H-5
Main Circuit Board Assembly (MICR I/F Block) . . . . . . . . . . . . . . . . . . . . . . . H-6
Main Circuit Board Assembly (Memory Block) . . . . . . . . . . . . . . . . . . . . . . . . . . . . H-7
RS-232 I/F Circuit Board Assembly (UB-S01) Circuit Diagram . . . . . . . . . . . . . . . H-8
Parallel I/F Circuit Board Assembly (UB-P02) Circuit Diagram . . . . . . . . . . . . . . H-9
RS-485 I/F Circuit Board Assembly (UB-S02) Circuit Diagram . . . . . . . . . . . . . . . H-10
Exploded Diagrams
General Lubrication Point Diagrams
Circuit Board Unit Circuit Diagrams
Appendix I
Using the Power Switch Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-1
Opening the Front Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-2
Installing or Replacing the Paper Roll . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-2
Removing paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-5
Installing the Ribbon Cassette . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-7
Inserting Slip Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-9
Inserting Validaton Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-9
Reading MICR Characters On Personal Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-10
Adjusting the Roll Paper Near End Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-11
Using the Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-12
Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-12
PAPER OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-12
SLIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-12
Control Panel Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-12
FEED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-13
RELEASE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-13
Appendix J
Appendix K
Main Circuit Board Unit (Parts Side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . K-1
Main Circuit Board Unit (Solder Side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . K-2
Printer Handling
Screw Types
Parts Layout
iv Rev. A
Confidential
RS-232 I/F Circuit Board Assembly (UB-S01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . K-3
Parallel I/F Circuit Board Assembly (UB-P02) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . K-3
RS-485 I/F Circuit Board Assembly (UB-S02) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . K-3
TM-U675/675P (with MICR) Service Manual
Rev. A v
Confidential
For Safe Repair and Maintenance Work
Key to Symbols
The symbols in this manual are identified by their level of importance, as defined below. Read
the following carefully before handling the product.
WARNING:
You must follow warnings carefully to avoid serious bodily injury.
CAUTION:
Observe cautions to avoid minor injury to your self, damage to your equipment, or loss
of data.
Note:
Notes have important information and useful tips on the operation of your equipment.
Safety Precautions on Handling
This section presents important information intended to ensure safe and effective use of this
product. Please read this section carefully and store it in an accessible location.
WARNING:
Shut down your equipment immediately if it produces smoke, a strange odor, or unusual
noise. Continued use may lead to fire or electric shock. Immediately unplug the
equipment.
Only disassemble this product as described in this manual. Do not make modifications to
the unit. Tampering with this product may result in injury, fire, or electric shock.
Be sure to use the specified power source. Connection to an improper power source
may cause fire or shock.
Never insert or disconnect the power plug with wet hands. Doing so may result in severe
shock.
Do not allow foreign matter to fall into the equipment. Penetration by foreign objects
may lead to fire or shock.
If water or other liquid spills into this equipment, unplug the power cord immediately.
Continued usage may lead to fire or shock.
Do not place multiple loads on the power outlet (wall outlet). Overloading the outlet
may lead to fire.
vi Rev. A
Confidential
Always supply power directly from a standard domestic power outlet.
Handle the power cord with care. Improper handling may lead to fire or shock.
Do not modify or attempt to repair the cord.
Do not place any object on top of the cord.
Avoid excessive bending, twisting, and pulling.
Do not place cord near heating equipment.
Check that the plug is clean before plugging it in.
Be sure to push the prongs all the way in.
TM-U675/675P (with MICR) Service Manual
CAUTION:
Do not connect cables in ways other than those mentioned in this manual.
Different connections may cause equipment damage and burning.
Be sure to set this equipment on a firm, stable, horizontal surface. Product may break or
cause injury if it falls.
Do not use in locations subject to high humidity or dust levels. Excessive humidity and
dust may cause equipment damage, fire, or shock.
Do not place heavy objects on top of this product. Never stand or lean on this product.
Equipment may fall or collapse, causing breakage and possible injury.
To ensure safety, please unplug this product prior to leaving it unused for an extended
period.
Do not touch the print head or the paper feed motor. Wait for the head and the motor
to cool. The head and the motor can be very hot after printing for a long time. Touching
them may cause burns.
Safety Precautions on Maintenance/Repair/Inspection
WARNING:
Be sure to use the designated type of fuse for the circuit board. Use of a different type
may result in fire.
Remove the power cord and all other cables from this product before disassembly or
reassembly to prevent electrical shock.
To prevent the possibility of electrical shock, do not perform maintenance, repair, or
inspection during a thunder storm.
Rev. A vii
Confidential
CAUTION:
Wear a grounded wrist band when handling the internal circuit boards to prevent
damage from static electricity.
When removing an internal circuit board, place it on an anti-static rubber sheet or
similar surface to prevent damage from static electricity.
Parts on the circuit board may become hot during operation. Therefore, wait
approximately 10 minutes after turning the power off before touching them.
Be careful not to subject the circuit boards to shock or vibration, because this may
damage them.
Do not touch the circuit board or cable terminals with your hands to prevent
contamination that may result in a malfunction.
Do not use an alcohol, benzine, thinner, trichloroethylene, or ketone based solvent to
clean the parts. This type of solvent may damage the plastic and rubber parts.
Wipe off any dirt with a dry or slightly moist cloth. Be sure to remove the power cord
from the outlet at this time.
Note on Disposal
Note:
Be sure to follow current laws or regulations when disposing the product.
Modular Connector
The following label is visible near the two modular connectors on the back of this product.
Use modular connectors specifically designed for the cash drawer and customer display for this
product. Do not connect these connectors to an ordinary telephone line.
viii Rev. A
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TM-U675/675P (with MICR) Service Manual
About This Manual
Aim of the Manual
This manual was created to provide the information on printer maintenance and repair required
by technicians who handle this work.
Manual Content
The manual is made up of the following sections:
Chapter 1 Troubleshooting
Chapter 2 Assembly and Disassembly
Chapter 3 Adjusting and Setting
Appendix A Service Tools and
Lubricants
Appendix B Maintenance
Appendix C Installation
Appendix D Product Overview
Appendix E Parts List
Appendix F Exploded Diagrams
Appendix G General Lubrication
Point Diagrams
Describes troubleshooting procedures (specific
problems and remedies)
Describes product assembly and disassembly
Describes product adjustment and setting
procedures
Describes tools and lubricants required to
perform maintenance and repair
Describes required procedures to perform
maintenance and inspection
Describes installation procedures
Provides reference information for maintenance
and inspection
Contains a list of spare parts
Disassembly diagrams for the product
Lubrication point diagrams for this product
Appendix H Circuit Board Unit Circuit
Diagrams
Appendix I Printer Handling
Appendix J Screw types
Appendix K Parts layout
Rev. A ix
Circuit diagrams for the product
Describes required handling procedures when
performing maintenance and repair
Describes screw types
Describes parts layout
Confidential
x Rev. A
Confidential
TM-U675/U675P (with MICR) Service Manual
Chapter 1
Troubleshooting
Before Servicing
"Precautions for Safety" (pages vi to viii) at the beginning of this manual provides precautions
you should observe to perform work safely and the necessary information to service this
product safely. Always read that information before starting your work.
Diagnosing Failures
Use one of the following methods to diagnose the areas where failures occurred.
❏ See Table 1-1 for diagnosing areas where failures occurred by the symptom of the problem.
❏ See Table 1-2 on page 1-9 for diagnosing areas where failures occurred from the ERROR LED
code.
❏ See Table 1-4 on page 1-13 when the failure is on the main circuit board unit.
Note:
The explanation of how to use the self test is on page 1-6.
The explanation of power on self checks is on page 1-4.
Symptoms and Solutions
This explains how to find the source of a problem using the symptom. The numbers in the
Solutions column indicate the order to use to check the problem. If you cannot determine the
cause of the problem after checking the first item, proceed to the next number.
Table1-1 Symptoms and Checkpoints.
Symptom Checkpoints (by Priority)
Power does not turn on.
Power on self check is not completed.
Or, POWER LED does not light.
There are missing dots in the print. 1. Replace the print head unit. (See page 1-16)
The print is thin. 1. Replace the ribbon cassette. (See page I-7)
1. Check the power supply unit. Check that 24V is coming out of
the power supply.
2. Check the main circuit board unit. (See page 1-13)
3. Unplug the printer. Then unplug each motor or coil's connector
from the main board one by one; plug the printer back in, and
power it on. This will let you know if any motor or coil has burned
out and is pulling down the power. (See page 1-11)
4. Replace the I/F circuit board. (See page 2-94)
2. Replace the main circuit board unit. (See page 2-75)
2. Proceed to “Ribbon won’t feed” below.
Rev. A Troubleshooting 1-1
Confidential
Table1-1 Symptoms and Checkpoints.
Symptom Checkpoints (by Priority)
Ribbon won’t feed. 1. Replace the ribbon cassette. (See page I-7)
2. Check sprocket and gears for paper particles.
3. Check the carriage motor and gears. (See page 1-11)
4. Replace the main circuit board. (See page 2-75)
Unevenness occurs in the concentration of
the print.
There is ink smudging on the print surface. 1. Check for paper residue around the print head unit.
Paper jams Remove the jammed paper by following the directions in
Roll paper feed failure 1. Check that the roll paper is inserted correctly. (See page I-2)
Slip paper/validation paper feed failure 1. Check that the slip paper/validation paper is inserted correctly.
Roll paper take-up failure 1. Check that the roll paper is inserted correctly. (See page I-2)
1. Replace the ribbon cassette. (See page I-7)
2. Adjust the platen gap. (See page 3-9)
2. Adjust the platen gap. (See page 3-9)
“Removing Paper Jams” on page 1-20.
2. Check the paper feed motor. (See page 1-11)
3. Check the J/S change solenoid. (See page 1-11)
4. Replace the main circuit board. (See page 2-75)
(See page I-9)
2. Check the paper feed motor. (See page 1-11)
3. Check the J/S change solenoid. (See page 1-11)
4. Replace the main circuit board. (See page 2-75)
2. Check that the take-up assembly is installed correctly into the
printer. (See page I-2)
3. Check that the take-up belt is attached correctly.
(See page 2-87)
4. Check the paper feed motor. (See page 1-11)
5. Check the J/S change solenoid. (See page 1-11)
6. Replace the main circuit board. (See page 2-75)
The printer won’t recognize when slip paper
is inserted.
The printer won’t recognize when validation
paper is inserted.
1. Clean away dirt around the slip B. O. F. detector assembly or the
slip T. O. F. detector assembly. (See page B-2)
2. Replace the slip B. O. F. detector assembly. (See page 2-45/2-
46)
3. Replace the slip T. O. F. detector assembly. (See page 2-61)
4. Replace the main circuit board. (See page 2-75)
1. Clean away dirt around the validation detector assembly. (See
page B-2)
2. Replace the validation detector assembly. (See page 2-45/2-
46)
3. Replace the main circuit board. (See page 2-75)
1-2 Troubleshooting Rev. A
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TM-U675/U675P (with MICR) Service Manual
Table1-1 Symptoms and Checkpoints.
Symptom Checkpoints (by Priority)
Roll paper semi-auto loading paper feed
failure
Drawer kick operation failure 1. Replace the main circuit board. (See page 2-75)
Display module display failure 1. Check that the unit is a serial model. (The display module will
1. Check that the roll paper is inserted correctly. (See page I-2)
2. Remove paper residue and dirt from the inside the paper feed
frame assembly.
3. Check the paper feed motor. (See page 1-11)
4. Check the J/S change solenoid. (See page 1-11)
5. Replace the main circuit board. (See page 2-75)
not work on parallel models.)
2. Check that DIP switch 2-2 is set to ON. (If it is OFF, the display
module will not work.)
3. Check fuse F3 on the main circuit board. (See page 1-15)
4. Replace the main circuit board. (See page 2-75)
MICR reading failure 1. Clean the MICR head. (See page B-3)
Missing characters/misprinted characters/
font breakdown
ERROR LED is lit.
(When it is flashing, see page 1-9.)
2. Replace the MICR head. (See page 2-8)
3. Replace the MICR fixing and MICR fixing sheet.
(See page 2-9)
4. Replace the MICR solenoid. (See page 2-11)
5. Replace the main circuit board. (See page 2-75)
1. Check the settings of the DIP switches. (See page D-67)
2. Replace the interface cable. (See page C-1)
1. Close the front cover or roll paper cover (rear cover).
2. Replace with new roll paper. (See page I-2)
Rev. A Troubleshooting 1-3
Confidential
Printer Mechanism Power on Checks
The printer mechanism runs through the following tests when you turn on the power supply to
the printer.
❏ Opens and closes the platen.
❏ Detects carriage home position.
❏ Feeds roll paper to the printer.
This section describes the items that you can check visually.
Opening and Closing the Platen
The printer opens and closes the platen once. Check this operation with the front cover opened.
check for the platen open and
close operation
Figure 1-1 Opening and closing the platen
Detecting the Head Carriage Home Position
The head carriage on a dot impact printer moves to the left side (home position) once and then
to the right side before stopping. Check this operation with the front cover opened.
check for head carriage
movement
Figure 1-2 Detecting the head carriage home position
1-4 Troubleshooting Rev. A
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Feeding Roll Paper
Roll paper is fed 1 to 2 mm. You cannot see this if the roll paper is not inserted.
check for paper feed
TM-U675/U675P (with MICR) Service Manual
Figure 1-3 Feeding roll paper
Rev. A Troubleshooting 1-5
Confidential
Starting and Stopping Self Tests
Printing Tests
Starting the Tests
❏ Roll paper self test:
The printer starts printing on the roll paper when you turn on the power while holding
down the receipt FEED button when all the covers are closed.
❏ Slip paper self test:
The SLIP LED flashes and the printer enters the slip paper wait mode when you turn on the
power while holding down the RELEASE button when all the covers are closed. Printing
starts on the slip paper when you insert a slip of paper in the printer.
❏ Validation paper self test:
Turn on the power supply while holding down the FEED and the RELEASE buttons while
the cover is closed. The SLIP LED flashes and the printer enters the validation paper wait
status. In this state, printing begins on the validation paper when you insert validation
paper.
Test Wait Mode
❏ Roll paper self test:
After the test print is completed, the printer enters the self test wait mode. The PAPER OUT
LED flashes after printing "SELF-TEST printing. Please press PAPER FEED button."
Test printing starts when you press the receipt paper FEED button.
❏ Slip paper self test:
When the printer status print is completed, the printer ejects the slip and waits for the next
slip of paper. Test printing starts when you insert a slip of paper in the printer.
❏ Validation paper self test:
When the printer has ejected the validation paper, you can insert the next validation sheet
and printing continues.
Ending the Test
The printer prints "***completed***" and the test ends when the determined number of lines
have been printed. The printer enters the normal mode after the power on tests are
completed.
1-6 Troubleshooting Rev. A
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TM-U675/U675P (with MICR) Service Manual
MICR Reader Test (Only with Printers that Have a MICR Unit.)
1. Load the roll paper in the printer.
2. Turn off the power supply to the printer.
3. Open the roll paper cover.
4. Press the RELEASE button while turning on the power supply.
5. Press the RELEASE button seven times.
6. Close the roll paper cover.
7. The following message is printed on the roll paper. The SLIP LED flashes.
**** RECOGNITION MODE ****
Please set check.
8. Insert check paper into the printer. Insert so that the MICR characters are facing upward on
one side of the paper insertion slot. The printer will run a test to read the check.
9. After reading is completed, remove the check. The printer prints the check data on the roll
paper.
<Example Printing> With E13B Font Check Paper
??????????? ?? ?? ?? ?? ????? ????
T012345678T 90 12 34 56 78900 1234
Data that was read
(lower line).
Rev. A Troubleshooting 1-7
Confidential
<Example Printing> With CMC7 Font Check Paper
=0000066 =123456789012^ 210987654321/
???????? ?????????????? ?????????????
10. Verify that the check was read correctly. You can continue running the test by inserting
more checks.
11. When you have finished the test, turn off the power supply to the printer.
Data that was read
(lower line).
1-8 Troubleshooting Rev. A
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TM-U675/U675P (with MICR) Service Manual
Troubleshooting Using the ERROR LED
You can learn the cause of a failure by checking the ERROR LED code. The following table
shows problems and solutions to repair the printer. Numbers in the "Solutions" column indicate
the order to use to check the problem. If you cannot determine the cause of the problem after
checking all the solutions listed, go back to the flowchart given earlier in this chapter.
Table1-2 Error causes and solutions
Type of Error and ERROR LED Pattern Explanation
Carriage home position detection
error
Carriage out-of-step error There is no carriage
The head carriage
home position was
not correctly
detected.
detector output
even when the
carriage is
instructed to move.
Solutions
(Listed in order you should use to check printer.)
1. Check the carriage assembly for paper jams.
(To remove the carriage cover, see page 1-17.)
2. Check for paper dust on the H.P. detector
assembly. (To remove the carriage cover, see
page 1-17.)
3. Replace the H.P. detector assembly. (See page 2-
21.)
1. Check the carriage assembly for paper jams.
(To remove the carriage cover, see page 1-17.)
2. Check the rotary encoder on the carriage motor
gear used to detect carriage position (The rotary
encoder is on the intermediate circuit board
assembly. You need to disassemble the
intermediate circuit board assembly to check the
encoder. To remove the intermediate circuit
board assembly, see page 2-21.)
Slip eject error The slip paper was
not ejected
normally.
Roll paper cover open error The roll paper cover
(rear cover) was
detected as open
when printing.
Memory or gate array R/W error The R/W check did
not operate
properly for the
memory or the
gate array.
3. Check the carriage motor. (See page 1-11.)
If the motor is shorted, replace it along with the
main board.
1. Look into the printer from the left side to check for
a paper jam in the slip paper transport path.
2. Check the paper feed motor. (See page 1-11.)
If the motor is shorted, replace it along with the
main board.
3. Try installing a new main circuit board unit to see if
the printer is fixed. (See page 2-75.)
Close the roll paper cover (rear cover).
Replace the main circuit board unit to see if the
printer is repaired. (See page 2-75.)
Rev. A Troubleshooting 1-9
Confidential
Table1-2 Error causes and solutions
Type of Error and ERROR LED Pattern Explanation
High voltage error The power supply
voltage is high.
Solutions
(Listed in order you should use to check printer.)
Replace the power supply unit to see if the printer is
repaired. (See page C-4.)
Low voltage error The power supply
CPU execution error An abnormal CPU
Drive circuit error One of the
Head high temperature error/roll
paper error
voltage is low
operation was
detected, or the I/F
board is
disconnected.
following was
detected.
❏
Print head
thermistor
detection error
❏
Lever drive motor
assembly error
One of the
following problems
has occurred.
❏
The roll paper
has been
inserted into the
path wrong.
❏
The print head
temperature is
high.
Replace the power supply unit to see if the printer is
repaired. (See page C-4.)
1. Check whether the I/F board is connected.
2. Replace the main circuit board unit to see if the
printer is repaired. (See page 2-75.)
1. Check if the printer is repaired after replacing the
print head unit. (See page 1-16.)
2. Check the resistance of the lever drive motor
assembly. (See page 1-11.) Replace if shorted.
3. Check if the printer is repaired after replacing the
lever motor T. P. detector assembly. (See page 2-
61)
4. Check if the printer is repaired after replacing the
main circuit board unit. (See page 2-75)
1. If the error has occurred after loading the roll
paper, the roll paper has been inserted into the
path wrong. Reinstall the roll paper.
2. If the error occurred during printing, a high head
temperature has been detected. This error may
occur if you print continuously for too long. Leave
the printer as it is. The error will be automatically
cleared when the temperature has decreased. If
this error occurs frequently, check if the ambient
temperature is within specifications.
1-10 Troubleshooting Rev. A
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TM-U675/U675P (with MICR) Service Manual
Test Points on the Printer Mechanism
This section shows how to test the motor and the coils.
Table1-3 Test points on the printer mechanism
Name of
Mechanism Part Name Internal Element Function Where to Check Normal Status
Mechanism
assembly
(M-U675)
Lever drive coil
A (left side
when facing
the front of the
printer.)
Lever drive coil
B (right side
when facing
the front of the
printer.)
Carriage motor 4 phase stepping
Lever drive
motor assembly
Paper feed
motor
J/S change
solenoid
Coil • Form stopper
Coil • Platen open
motor
DC brush motor • Form stopper
4 phase stepping
motor
Coil Change of
operation
• Slip paper roller
(sub) operation
and close.
• Cylindrical
printer platen
open and close
Head carriage
drive
operation
• Slip paper roller
(sub) operation
• Platen open
and close
• Endorsement
printer platen
open and close
Slip paper feed Remove the cable
journal paper
drive/slip paper
drive.
Remove the cable
connector
connected to
CN30 on the main
circuit board unit
and test between
pin 26 and pin 27.
Remove the cable
connector
connected to
CN30 on the main
circuit board unit
and test between
pin 26 and pin 28.
Remove the cable
connector
connected to
CN30 on the main
circuit board unit
and test between
pin 1 and pin 2
and between
pin 3 and pin 4.
Remove the cable
connector
connected to
CN30 on the main
circuit board unit
and test between
pin 29 and pin 30.
connector
connected to
CN30 on the main
circuit board unit
and test between
pin 17 and pin 18
and between
pin 19 and pin 20.
Remove the cable
connector
connected to
CN30 on the main
circuit board unit
and test between
pin 21 and pin 22 .
Approx. 70 Ω
Approx. 70 Ω
Approx. 4.5 Ω (per
1 phase)
The line must be
continuous.
Approx. 8 Ω (per 1
phase)
Approx. 45 Ω
Rev. A Troubleshooting 1-11
Confidential
Table1-3 Test points on the printer mechanism
Name of
Mechanism Part Name Internal Element Function Where to Check Normal Status
Mechanism
assembly
(M-U675)
MICR solenoid Coil MICR hold drive Remove the cable
connector
connected to
CN27 on the main
circuit board unit
and test between
pin 1 and pin 2 .
Approx. 28.8 Ω
1-12 Troubleshooting Rev. A
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TM-U675/U675P (with MICR) Service Manual
Test Points on the Main Circuit Board Unit
Power Supply Line Check
After a main circuit board unit failure, one basic method for diagnosing the cause of the problem
on the main circuit board unit is to check the power supply line. Use the following table to check
the power supply line. First, check step number 1, and proceed to the next step if that is not the
problem.
Table1-4 Checking the power supply line
Step
# Type of Voltage
1 Voltage input
from the power
supply
2 Voltage input
from the power
supply
Location of
Measurement
CN29, pin 1 Output when
U11, pin 1 Output when
Condition of
Measurement
the power
supply is ON.
the power
supply is ON.
Normal
Value Presumed Cause of the Error
24 V ± 10 % It is possible that the problem is pre-
arcing of the F1 fuse. The fuse may
have pre-arced because of an
unusual input circuit.
Always replace the fuse after
removing the cause of the pre-arcing.
If you do not remove the cause of the
pre-arcing, and replace this fuse, the
problem may expand to
misoperation. Also, always use the
specified type of fuse when replacing.
24 V ± 10 % It is possible that the problem is pre-
arcing of the R3 fuse. The fuse may
have pre-arced because of a
problem in the logic power supply
circuit or because of a VCC overvoltage.
3 Logic voltage
(VCC)
4 Logic voltage
(VCC-PWR)
5 Logic voltage
(VCC-PWR2)
VCC pad
(near L2)
VCC-PWR pad
(near U14,
pin 40)
U19, pin 8
potential
Output when
the power
supply is ON.
Output when
Q51 (C) is "0."
(24V SW1="H")
Output when
Q60 (C) is "0."
(24V SW2="H")
If pre-arcing of the R3 fuse happens,
do not repair the main circuit board
unit. The quality of several parts on the
circuit board is weakened by prearcing of the R3 fuse and safe
operation cannot be guaranteed.
5 V ± 5 % It is possible that the logic power
supply circuit has malfunctioned.
If you find this line has a problem, do
not repair the main circuit board unit.
The quality of several parts on the
circuit board is weakened, and safe
operation cannot be guaranteed.
5 V ± 5 % The logic power supply circuit or Q44
could have malfunctioned.
5 V ± 5 % The logic power supply circuit or Q59
could have malfunctioned.
Rev. A Troubleshooting 1-13
Confidential
Table1-4 Checking the power supply line
Step
# Type of Voltage
6 Logic voltage
(VCC_SEN)
7 Mechanism
voltage
(24VA)
8 Mechanism
voltage
(24 VB)
9 Mechanism
voltage
(24C)
Location of
Measurement
CN30, pin 5
potential
Located near
Q17 drain
Located near
Q7 drain
Located near
Q29 base
Condition of
Measurement
Output only
when there is
output sensor
conductivity
when CPU
output port
(SEN_PWR) is "L."
Output when
Q24 (C) is "0."
(24V SW2 = "H")
Only output
continuously
when power
supply unit is
connected.
Output when
Q46 (C) is "0."
(24V SW1="H")
Normal
Value Presumed Cause of the Error
5 V ± 5 % The logic power supply circuit or Q44
could have malfunctioned.
24 V ± 10 % Q17 could have malfunctioned.
24 V ± 10 % TH1 could have malfunctioned.
24 V ± 10 % It is possible that the problem is pre-
arcing of the F2 fuse. The fuse may
have pre-arced because of a defect
in the 24V line circuit elements.
If pre-arcing of the F2 fuse happens,
do not repair the main circuit board
unit. The quality of several parts on the
circuit board is weakened by prearcing of the F2 fuse, and safe
operation cannot be guaranteed.
1-14 Troubleshooting Rev. A
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TM-U675/U675P (with MICR) Service Manual
Locations of the Main Elements on the Main Circuit Board Unit
The following shows the locations of the main elements on the main circuit board unit.
Fuse (F3)
Fuse (F1)
CPU (U3)
Gate array (U30)
*under the
memory board
Carriage motor
controller (U14)
Fuse (F2)
Memory board
Font ROM (U513)
Program ROM (U508)
SRAM (U509)
Figure 1-4 Locations of the main elements on the main circuit board unit
Impact dot head
drivers (QM3)
Impact dot head
drivers (QM6)
Slip paper feed motor
controller (U17)
*Rear side
Fuse (F4)
Fuse (R3)
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Procedures for Replacing the Print Head Unit
This section explains how to replace the dot impact print head.
1. Turn off the power switch to the printer. Remove the power supply unit from the printer.
2. Open the printer front cover and remove the ribbon cartridge.
Figure 1-5 Removing the ribbon cartridge
3. Pull the cable connector out of the slit in the case.
Figure 1-6 Pulling the cable connector out
When you are reattaching the cable, arrange the cable wires as shown below.
Figure 1-7 Arranging the cable wires
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TM-U675/U675P (with MICR) Service Manual
4. Remove the two screws and remove the carriage cover frame assembly.
screw
screw
Figure 1-8 Removing the carriage cover frame assembly
When you are reattaching the frame, insert the tooth on the left side into the shaft and align
the nib on the right side with the nib hole.
tooth
nib
Figure 1-9 Tooth and nib
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5. Move the head carriage to the right side and remove the print head unit FPC from the
connector.
Figure 1-10 Removing the print head unit FPC
6. Remove the screw and remove the print head unit.
Figure 1-11 Removing the print head unit
When attaching, pass the print head unit FPC through the slit in the head carriage and attach
below the two nibs.
Two nibsSlit
Figure 1-12 Slit and two nibs
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7. Remove the nose guide from the print head unit.
nose guide
Figure 1-13 Removing the nose guide
8. To reinstall the print head, reverse the procedures you used to remove it.
TM-U675/U675P (with MICR) Service Manual
Rev. A Troubleshooting 1-19
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