Epson U675 - TM Color Dot-matrix Printer User manual

Confidential

Service manual

TM-U675/U675P

(with autocutter)

English

401239103

Rev.D

Issued Date , ,

Issued by

EPSON

Revision Table i

Confidential TM-U675/U675P(with autocutter) Service Manual

Revision Table

Rev. Page Description

Rev. A All pages Newly authorized

Rev. B 3-8 Changed the explanation for “Adjusting the Platen Gap.”

Reason for change:

Mistakes and missing information.

Rev. C 2-118

F-2

Added the parts “Ferrite core“ .

Reason for change:

To meet the EMC requirements.

H The explanation for the Appendix-H is moved to the other text ”tm-u675ac_eng_sm_revC”.

Reason for change

To cut the data capacity of the manual per one text by dividing the manual between two

texts.

Rev. D 2-24 Added the information how to solder the cables (carriage motor cable).

Reason for change

To use the parts in common with other models.

2-93 Added the information how to solder the cables (paper feed motor cable).

Reason for change

To use the parts in common with other models.

Confidential

ii Revision Table

Rev.D i

TM-U675/U675P (with autocutter) Service Manual

Confidential

CONFIDENTIALITY AGREEMENT

BY USING THIS DOCUMENT, YOU AGREE TO ABIDE BY THE TERMS OF THIS AGREEMENT. PLEASE RETURN

THIS DOCUMENT IMMEDIATELY IF YOU DO NOT AGREE TO THESE TERMS.

❏This document contains confidential, proprietary information of Seiko Epson Corporation or its affiliates. You

must keep such information confidential. If the user is a business entity or organization, you must limit disclosure

to those of your employees, agents, and contractors who have a need to know and who are also bound by

obligations of confidentiality.

❏On the earlier of (a) termination of your relationship with Seiko Epson, or (b) Seiko Epson’s request, you must

stop using the confidential information. You must then return or destroy the information, as directed by Seiko

Epson.

❏If a court, arbitrator, government agency, or the like orders you to disclose any confidential information, you must

immediately notify Seiko Epson. You agree to give Seiko Epson reasonable cooperation and assistance in the

negotiation.

❏You may use confidential information only for the purpose of operating or servicing the products to which the

document relates, unless you obtain the prior written consent of Seiko Epson for some other use.

❏Seiko Epson warrants that it has the right to disclose the confidential information. SEIKO EPSON MAKES NO

OTHER WARRANTIES CONCERNING THE CONFIDENTIAL INFORMATION OR ANY OTHER

INFORMATION IN THE DOCUMENT, INCLUDING (WITHOUT LIMITATION) ANY WARRANTY OF TITLE

OR NON-INFRINGEMENT. Seiko Epson has no liability for loss or damage arising from or relating to your use of

or reliance on the information in the document.

❏You may not reproduce, store, or transmit the confidential information in any form or by any means (electronic,

mechanical, photocopying, recording, or otherwise) without the prior written permission of Seiko Epson.

❏Your obligations under this Agreement are in addition to any other legal obligations. Seiko Epson does not waive

any right under this Agreement by failing to exercise it. The laws of Japan apply to this Agreement.

Cautions

❏No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any

means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of

Seiko Epson Corporation.

❏The contents of this document are subject to change without notice. Please contact us for the latest information.

❏While every precaution has been taken in the preparation of this document, Seiko Epson Corporation assumes no

responsibility for errors or omissions.

❏Neither is any liability assumed for damages resulting from the use of the information contained herein.

❏Neither Seiko Epson Corporation nor its affiliates shall be liable to the purchaser of this product or third parties

for damages, losses, costs, or expenses incurred by the purchaser or third parties as a result of: accident, misuse, or

abuse of this product or unauthorized modifications, repairs, or alterations to this product, or (excluding the U.S.)

failure to strictly comply with Seiko Epson Corporation’s operating and maintenance instructions.

❏Seiko Epson Corporation shall not be liable against any damages or problems arising from the use of any options

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

ii Rev.D

Confidential

Contents

Revision Table

Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii

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 Troubleshooting

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

Feeding Roll Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Starting and Stopping Self Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Printing Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

Locations of the Main Elements on the Main Circuit Board Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14

Procedures for Replacing the Print Head Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15

Removing Paper Jams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19

Paper Jams in the Autocutter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19

Paper Jams in the Roll Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19

Paper Jams in the Slip Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20

Detector Functions and Positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21

Chapter 2 Assembly and Disassembly

Before Assembly and Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

About this Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Assembling the Mechanism Assembly (M-U675) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Pre-assembly Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Assembly of the Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-55

Assembling the TM-U675/U675P . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-94

Pre-assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-94

Assembly of the TM-U675 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-96

Chapter 3 Adjusting and Setting

Before Adjusting and Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Phase Adjusting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Adjusting the Platen Gap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

Setting Threshold Values for Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10

Rev.D iii

TM-U675/U675P (with autocutter) Service Manual

Confidential

Appendix A Service Tools and Lubricants

Appendix B Maintenance

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 Installation

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 Product Overview

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 (Factory Option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-31

Cutter Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-34

Autocutter Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-34

Drive Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-35

Cutter Blade Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-36

Clutch Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-36

Autocutter Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-36

Cutter Blade Knobs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-37

Emergency Cutter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-38

Outline of Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-39

Connection of Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-39

Circuit Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-40

Memory Circuit Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-41

Main Circuit Board Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-42

CPU and Peripheral Logic Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-44

Slip Mechanism Drive Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-55

Input Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-66

Control Panel Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-69

Malfunction Protective Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-70

Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-71

Important Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-72

DIP Switch Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-73

Serial Interface Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-73

Parallel Interface Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-75

Outline of Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-76

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-76

Printer Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-77

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Confidential

MICR Reader (Factory Option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-78

Autocutter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-78

Overall Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-79

Interface Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-80

Appendix E Parts List

Alphanumeric List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1

Reference Number List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-10

Appendix F Exploded Diagrams

TM-U675/U675P . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-1

Autocutter Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-2

Mechanism Assembly (without MICR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-3

Mechanism Assembly (with MICR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-4

Frame Assembly (without MICR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-5

Frame Assembly (with MICR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-6

Carriage Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-7

PF Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-8

MICR Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-9

Appendix G General Lubrication Point Diagrams

TM-U675/U675P . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-1

Autocutter Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-2

Mechanism Assembly (without MICR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-3

Mechanism Assembly (with MICR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-4

Frame Assembly (without MICR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-5

Frame Assembly (with MICR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-6

Carriage Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-7

PF Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-8

MICR Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G-9

Appendix I Printer Handling

Using the Power Switch Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-1

Opening the Front Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-2

Opening and Closing the Roll Paper Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-2

Opening the Roll Paper Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-2

Closing the Roll Paper Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-3

Installing or Replacing the Paper Roll . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-3

Removing Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-7

Installing the Ribbon Cassette . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-8

Inserting Slip Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-10

Inserting Validaton Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-10

Reading MICR Characters On Personal Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-11

Adjusting the Roll Paper Near End Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-12

Using the Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-13

Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-13

Control Panel Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-13

Appendix J Screw Types

Appendix K Parts Layout

Main Circuit Board Unit (Parts Side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . K-1

Main Circuit Board Unit (Solder Side)　 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . K-2

Rev.D v

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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.

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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.

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.

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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 of the product.

Modular Connector

The following label is visible near the two modular connectors on the back of this product.

Use the modular connectors specifically designed for the cash drawer and customer display for

this product. Do not connect these connectors to an ordinary telephone line.

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Confidential

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 Describes troubleshooting procedures (specific

problems and remedies)

Chapter 2 Assembly and Disassembly Describes product assembly and disassembly

Chapter 3 Adjusting and Setting Describes product adjustment and setting

procedures

Appendix A Service Tools and

Lubricants Describes tools and lubricants required to

perform maintenance and repair

Appendix B Maintenance Describes required procedures to perform

maintenance and inspection

Appendix C Installation Describes installation procedures

Appendix D Product Overview Provides reference information for maintenance

and inspection

Appendix E Parts List Contains a list of spare parts

Appendix F Exploded Diagrams Disassembly diagrams for the product

Appendix G General Lubrication

Point Diagrams Lubrication point diagrams for this product

Appendix H Circuit Board Unit Circuit

Diagrams Circuit diagrams for the product

Appendix I Printer Handling Describes required handling procedures when

performing maintenance and repair

Appendix J Screw types Describes screw types

Appendix K Parts layout Describes parts layout

Rev.D Troubleshooting 1-1

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Chapter 1

Troubleshooting

Before Servicing

The beginning of this manual (pages vi to viii) 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 area where a failure occurred.

❏See Table 1-1 for diagnosing the area where a failure occurred by the symptom of the

problem.

❏See Table 1-2 on page 1-9 for diagnosing the area where a failure occurred from the ERROR

LED code.

❏See Table 1-4 on page 1-12 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 Checkpoint

Symptom Checkpoints (by Priority)

Power does not turn on.

Power on self check is not completed.

Or, POWER LED does not light.

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 1-12.)

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 2-129.)

There are missing dots in the print. 1. Replace the print head unit. (See page 1-15.)

2. Replace the main circuit board unit. (See page 2-96.)

The print is thin. 1. Replace the ribbon cassette. (See page I-8.)

2. Proceed to “Ribbon won’t feed” below.

1-2 Troubleshooting Rev.D

Confidential

Ribbon won’t feed. 1. Replace the ribbon cassette. (See page I-8.)

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 2-96.)

Unevenness occurs in the concentration of

the print.

1. Replace the ribbon cassette. (See page I-8.)

2. Adjust the platen gap. (See page 3-8.)

There is ink smudging on the print surface. 1. Check for paper residue around the print head unit.

2. Adjust the platen gap. (See page 3-8.)

Paper jams Remove the jammed paper by following the directions in

“Removing Paper Jams” on page 1-19.

Roll paper feed failure 1. Check that the roll paper is inserted correctly. (See page I-3.)

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 unit. (See page 2-96.)

Slip paper/validation paper feed failure 1. Check that the slip paper/validation paper is inserted correctly.

(See page I-10)

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 unit. (See page 2-96.)

Roll paper take-up failure 1. Check that the roll paper is inserted correctly. (See page I-3.)

2. Check that the take-up assembly is installed correctly into the

printer. (See page I-6.)

3. Check that the take-up belt is attached correctly.

(See page 2-112.)

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 2-96.)

The printer won’t recognize when slip 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 2-63.)

3. Replace the slip T. O. F. detector assembly. (See page 2-77.)

4. Replace the main circuit board unit. (See page 2-96.)

The printer won’t recognize when validation

paper is inserted.

1. Clean away dirt around the validation detector assembly. (See

page B-2.)

2. Replace the validation detector assembly. (See page 2-63.)

3. Replace the main circuit board unit. (See page 2-96.)

Roll paper semi-auto loading paper feed

failure

1. Check that the roll paper is inserted correctly. (See page I-3.)

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 unit. (See page 2-96.)

Table1-1 Symptoms and Checkpoint

Symptom Checkpoints (by Priority)

Rev.D Troubleshooting 1-3

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Drawer kick operation failure 1. Replace the main circuit board unit. (See page 2-96.)

Display module display failure 1. Check that the unit is a serial model. (The display module will

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. Replace the main circuit board unit. (See page 2-96.)

MICR reading failure 1. Clean the MICR head. (See page B-3.)

2. Replace the MICR head. (See page 2-9.)

3. Replace the MICR fixing and MICR fixing sheet.

(See page 2-10)

4. Replace the MICR solenoid. (See page 2-12.)

5. Replace the main circuit board unit. (See page 2-96.)

Missing characters/misprinted characters/

font breakdown

1. Check the settings of the DIP switches. (See page D-73.)

2. Replace the interface cable. (See page C-1.)

ERROR LED is lit.

(When it is flashing, see page 1-9.)

1. Close the front cover or roll paper cover (rear cover).

2. Replace with new roll paper. (See page I-3.)

Autocutter does not work 1. Check the cutter motor assembly. (See page 1-11.)

2. Replace the main circuit board unit. (See page 2-96.)

Table1-1 Symptoms and Checkpoint

Symptom Checkpoints (by Priority)

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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.

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.

Figure 1-2 Detecting the head carriage home position

check for the platen open and

close operation

check for head carriage

movement

Rev.D Troubleshooting 1-5

TM-U675/U675P (with autocutter) Service Manual

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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.

Figure 1-3 Feeding roll paper

check for paper feed

1-6 Troubleshooting Rev.D

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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. After printing is completed,

operate the autocutter to cut the receipt.

❏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. After printing to the paper roll, operate the autocutter to cut the receipt.

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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.

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.

**** RECOGNITION MODE ****

Please set check.

<Example Printing> With E13B Font Check Paper

Data that was read

(lower line).

??????????? ????????????? ????

T012345678T 9012345678900 1234

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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.

<Example Printing> With CMC7 Font Check Paper

Data that was read

(lower line).

=0000066 =123456789012^ 210987654321/

???????? ?????????????? ?????????????

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