Epson TM U675 Diagram

Confidential

Service manual

TM-U675/U675P

(with autocutter)

Issued Date , ,

Issued by

EPSON

English

401239100

Confidential

TM-U675/U675P (with autocutter) Service Manual

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

Rev. A i

Confidential

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

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

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

Troubleshooting

Assembly and Disassembly

Chapter 3

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

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

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

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

Adjusting and Setting

ii Rev. A

Confidential

TM-U675/U675P (with autocutter) 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 (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

Service Tools and Lubricants

Maintenance

Installation

Product Overview

Rev. A iii

Confidential

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

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

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

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

Appendix E

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

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

Appendix F

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

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

Parts List

Exploded Diagrams

General Lubrication Point Diagrams

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

Appendix I

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

Circuit Board Unit Circuit Diagrams

Printer Handling

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

TM-U675/U675P (with autocutter) Service Manual

Appendix J

Appendix K

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

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

Screw Types

Parts Layout

Rev. A 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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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/U675P (with autocutter) 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.

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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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TM-U675/U675P (with autocutter) 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

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TM-U675/U675P (with autocutter) Service Manual

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.

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

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.)

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.

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Table1-1 Symptoms and Checkpoint

Symptom Checkpoints (by Priority)

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.

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-3.)

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-3.)

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

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

“Removing Paper Jams” on page 1-19.

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.)

(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.)

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.

The printer won’t recognize when validation paper is inserted.

Roll paper semi-auto loading paper feed failure

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.)

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.)

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.)

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TM-U675/U675P (with autocutter) Service Manual

Table1-1 Symptoms and Checkpoint

Symptom Checkpoints (by Priority)

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

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.)

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

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.)

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.)

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

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-3.)

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

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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.

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

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TM-U675/U675P (with autocutter) Service Manual

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

Figure 1-3 Feeding roll paper

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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.

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.

After printing is completed,

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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TM-U675/U675P (with autocutter) 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).

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<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).

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TM-U675/U675P (with autocutter) 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

Autocutter Error An autocutter error

LED ON

320ms

5120ms

Carriage home position detection error

was detected.

The head carriage home position was not correctly detected.

Solutions (Listed in the order you should use to check printer)

1. Check for paper jams around the autocutter. (See page 1-19.)

2. Check the cutter motor assembly. (See page 1-11.)

If there has been a short in the cutter motor

assembly, replace the main circuit board unit at the same time. (See page 2-96.)

3. Replace the main circuit board unit and see if the problem is fixed. (See page 2-96.)

If the printer is repaired, refer to Test Points on the

Main Circuit Board Unit (See page 1-12.) to analyze the defective areas on the board.

1. Check the carriage assembly for a paper jam.

(To remove the carriage cover, see page 1-16.)

2. Check for paper dust on the H.P. detector

assembly. (To remove the carriage cover, see page 1-16.)

Carriage out-of-step error There is no carriage

detector output even when the carriage is instructed to move.

Slip eject error The slip paper was

not ejected normally.

3. Replace the H.P. detector assembly. (See page 2-

22.)

1. Check the carriage assembly for a paper jam.

(To remove the carriage cover, see page 1-16.)

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 2-22.)

3. Check the carriage motor. (See page 1-11.)

If the motor is shorted, replace it along with the main board.

4. Replace the main circuit board unit and see if the problem is fixed. (See page 2-96)

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 2-96)

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Table1-2 Error causes and solutions

Type of Error and ERROR LED Pattern Explanation

Roll paper cover open error The roll paper cover

(rear cover) was detected as open when printing.

Solutions (Listed in the order you should use to check printer)

Close the roll paper cover (rear cover).

Memory or gate array R/W error The R/W check did

not operate properly for the memory or the gate array.

High voltage error The power supply

voltage is high.

Low voltage error The power supply

voltage is low

CPU execution error An abnormal CPU

Drive circuit error One of the

operation was detected, or the I/F board is disconnected.

following was detected.

❏

Print head thermistor detection error

❏

Lever drive motor assembly error

Replace the main circuit board unit to see if the printer is repaired. (See page 2-96.)

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 2-96.)

1. Check if the printer is repaired after replacing the print head unit. (See page 1-15.)

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-

78.)

4. Check if the printer is repaired after replacing the main circuit board unit. (See page 2-96.)

Head high temperature error/roll paper error

One of the following problems has occurred.

❏

The roll paper has been inserted into the path wrong.

❏

The print head temperature is high.

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.

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TM-U675/U675P (with autocutter) 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

Autocutter unit

Mechanism assembly (M-U675)

Cutter motor assembly

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

MICR solenoid Coil MICR hold drive Remove the cable

DC brush motor Autocutter drive Remove the cable

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.

connector connected to CN7 on the main circuit board unit and test between pin 1 and pin 2.

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 .

connector connected to CN27 on the main circuit board unit and test between pin 1 and pin 2 .

The line must be continuous.

Approx. 70 Ω

Approx. 4.5 Ω (per 1 phase)

The line must be continuous.

Approx. 8 Ω (per 1 phase)

Approx. 45 Ω

Approx. 28.8 Ω

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Test Points on the Main Circuit Board Unit

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.

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)

6 Logic voltage

(VCC_SEN)

VCC pad (near L2)

VCC-PWR pad (near U14, pin 40)

U19, pin 8 potential

CN30, pin 5 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")

Output only when there is output sensor conductivity when CPU output port (SEN_PWR) is "L."

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.

5 V ± 5 % The logic power supply circuit or Q44

could have malfunctioned.

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Table1-4 Checking the power supply line

Step # Type of Voltage

7 Mechanism

voltage (24 VA)

8 Mechanism

voltage (24 VB)

9 Mechanism

voltage (24C)

Location of Measurement

Located near Q17 drain

Located near Q7 Source

Located near Q29 base

TM-U675/U675P (with autocutter) Service Manual

Condition of Measurement

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

24 V ± 10 % Q17 could have malfunctioned.

24 V ± 10 % Q61 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.

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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 (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 (QM8)

Impact dot head drivers (QM6)

Slip paper feed motor controller (U17)

*Rear side

Fuse (F4) Fuse (R3)

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TM-U675/U675P (with autocutter) Service Manual

Procedures for Replacing the Print Head Unit

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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4. Remove the two screws and remove the carriage cover frame assembly.

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.

nib

tooth

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 flexible plastic cable (FPC) from the connector.

Figure 1-10 Removing the print head unit FPC

6. Remove the screw and remove the print head unit.

TM-U675/U675P (with autocutter) Service Manual

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. When reinstalling, affix the head seal to the print head unit.

print head unit

head seal

Figure 1-14

1-18 Troubleshooting Rev. A

Confidential

TM-U675/U675P (with autocutter) Service Manual

Removing Paper Jams

Paper Jams in the Autocutter

Retract the autocutter movable blade using the following procedure.

1. Pull the latch levers on the right and left sides to the front and open the roll paper cover.

2. Rotate the knob on the autocutter in the direction of the arrow to align the axis with the circular hole (marked with a triangular hole) in the center of the arc-shaped slit.

3. Remove the paper.

knob

marked arrow

Figure 1-15

Paper Jams in the Roll Paper

1. Pull the latch lever to the front and open the roll paper cover.

2. Remove the take-up assembly.

3. Open the clamshell mechanism while pushing on the levers on both ends.

levers

arc-shaped slit

axis

Figure 1-16

Rev. A Troubleshooting 1-19

+ 301 hidden pages

Epson TM U675 Diagram

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents

For Safe Repair and Maintenance Work

Key to Symbols

Safety Precautions on Handling

Safety Precautions on Maintenance/Repair/Inspection

Note on Disposal

Modular Connector

About This Manual

Aim of the Manual

Manual Content

Troubleshooting

Before Servicing

Diagnosing Failures

Symptoms and Solutions

Printer Mechanism Power on Checks

Opening and Closing the Platen

Detecting the Head Carriage Home Position

Feeding Roll Paper

Starting and Stopping Self Tests

Printing Tests

MICR Reader Test (Only with Printers that Have a MICR Unit)

Troubleshooting Using the ERROR LED

Test Points on the Printer Mechanism

Test Points on the Main Circuit Board Unit

Locations of the Main Elements on the Main Circuit Board Unit

Procedures for Replacing the Print Head Unit

Removing Paper Jams

Paper Jams in the Autocutter

Paper Jams in the Roll Paper