Epson TM-L90 series Service Manual

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Confidential

Service manual

Issued date , ,

TM-L90 series

Issued by

EPSON

English

401392002

Rev.C

Confidential

Revision Table

Rev. Page Description

Rev. A all pages Newly authorized Rev. B viii Add the information of the related documentation

Reason for change: The “TM Service & Support Tool“ is release.

1-1 Add the “powe r su p ply unit type in th e ”s p ecifications and configurations.

Exclusive external power supply unit: PS-175 (North America only) or PS-180 (power supply packaged specification only). External power supply unit: Model PS-180 and PS-170.

Reason for change: Missing information.

2-2 Added the sentence below to the explaination “Paper is jammed inside the

printer”.

{Please confirm to be attached the holder guide sheet C(#182) and D(#183) when the paper is jammed in spite of doing the above steps. (Refer to Appendix D-12.)}

Reason for change: The parts “Holder guide sheet C(#182) and Holder guide sheet D(#183)“ were provided in order to prevent the paper from jamming.

TM-L90 Service Manual

Add the “before servi cing“ and “diagnosing failures“.

Reason for change: To make the explanation easier to understand.

2-3 Change the “Troubleshoting Fliowcharts“ to the “simptoms and solutions”.

Reason for change: To make the explanation easier to understand.

2-5 Add the explanation to the ”paper layout error” that is the automatically

2-6 Add the below explanation to ”Autocutter error” that is the automatically

2-8 Add the “test po ints on the print e r m ec h anism“.

3-17 Add the “insla ti ng tape“ to fix fer ri t e c ore. 3-37 Add two spacers on the illustration.

recoverable errors of the ”Troubleshooting using the ERROR LED”

Reason for change: Missing information.

recoverable errors of the ”Troubleshooting using the ERROR LED” ❏ Check the cutter motor sub-assembly. (see page 2-8.) Replace the motor and

the main circuit board unit if the cutter motor sub-assembly has been shorted. (See page 3-39, 3-13.)

❏ Replace the main cir cui t boar d un it to see if the pr i nter i s r epa ired. (Se e pa ge 3-

13.) If the printer is repaired, analyze the defective part by referrin g to “Main Circuit Board Unit Test Points“ on page appendix F-6.

Reason for change: Missing information.

Reason for change: Because of changing chapter 2.

Confidential

Rev. Page Description

4-1 Add the paper types for origin al and specified paper.

Reason for change:

To make the explanation easier to understand. 6-10 6-13

Rev. B 6-15 Add the felow explanation for “select paper with s”.

7-3 Add the exp lanation for “Precautions on paper handling“.

Add the note about the setting for serial communication conditions.

Changed the explanation for the ”Capacity of the receive buffer” that is the

function for the”memory swit ch1-2”

old: Capacity of the receive buffer “la rge “/O FF.

new: Capac ity of the receive buf f er “4KB“/OFF .

old: Capacity of the rece iv e bu f fe r “s ma ll“ / O N.

new: Capac ity of th e re c eive buffer “45B“/ON.

Reason for change:

To make the explanation easier to understand.

43 steps in increment of 1 mm, except for the size from 71 mm to 79 mm

Reason for change:

To make the explanation easier to understand.

When the printer is not used for one week or more, it is recomended not to leave

the thermal paper between the platen and the print head.

Reason for change:

Missing information. Appendix A Add the explanation for the paper types for original and specified paper . (To

Appendix D The parts below were newly provided.

ensure print quality, be sure to use the specified pap er. )

old: Label paper

new: Lavel paper (with black mark)

Lavel paper (without black mark)

Reason for change:

Missing information.

spacer

Sheet, holder guide, C

Sheet, holder guide, D

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Rev. Page Description

Rev. C <Discontinued parts>

Sheet, holder guide, (Ref# 176) Sheet, holder guide, C (Ref# 182) Sheet, holder guide, D (Ref# 183

TM-L90 Service Manual

3-26,46,52 The new parts “Spacer Thermal Head“ is added on Thermal Print Head.So the following illustration

3-25,52 Added the explanation about the method of install ing the head (new type)

Appendix D-10

is changed.

Before change After change

as “Important Note About Installing Thermal Print Head“.

The part “Spacer Thermal Head“ on Pa rs L is t and Exploded Diag ram is deleted.

Spacer Thermal Head

iii

Confidential

TM-L90 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 con fidential. I f the user is a b usine ss entit y or organiz ation, you must limit disclosur e 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 informa ti on. You must th en ret urn or de st roy th e informa ti o n, as dir ected by Seiko Epson.

❏ If a court, arbit rat or, gove rnmen t ag ency , or th e like orde rs you t o di sclose any con fide ntia l informa tion, 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 o r damage arisi ng from or relating t o 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 Agreem en t a re in addi tion to a ny ot her lega l obl iga ti ons. 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 subj ect to change without notice. Please contact us for the lates t information. ❏ While every precaution has been taken in the prepara ti on of this d ocumen t, Seik o Epson Corpora t ion a ssumes 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, losse s, cos ts, or expen ses inc urred by t he purc hase r or t hird parties a s a r esul t of: a cciden t, mi suse, or abuse of this product or unau thoriz ed modifi cati ons, r epairs, or alterations to this product, or (ex c luding t he 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 Corporati on.

EPSON

and ESC/POS® are registered trademarks of Seiko Epson Corporation

Rev.B i

Confidential

For Safe Repair and Maintenance Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

Key to Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .v

Safety Precautions on Maintenance/Repair/Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

Modular Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vi

About this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii

Aim of the Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii

Contents of the Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii

Related Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii

Chapter 1 Product Overview

Specifications and Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1

Chapter 2 Troubleshooting Guide

Preparations for Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Before Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2

Diagnosing Failures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2- 2

Symptoms and Solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3

How to Use the Self-test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4

Print Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Troubleshooting Using the ERROR LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5

Test Points on the Printer Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-8

Chapter 3 Disassembly and Assembly

Notes for Assembly and Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 -1

How to Read this Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Structure of this Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Shortest Route for Disassembly of Major Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Representation of Small Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Replacing the Thermal Print Head Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Disassembly and Assembly of the TM-L90 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

First Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 -9

Disassembly and Assembly of the Printer Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

First Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 -15

Second Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-35

Third Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-47

Chapter 4 Adjustment and Settings

Threshold Value Setting for Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Chapter 5 Maintenance, Inspection, Lubrication, and Cleaning

Periodic Maintenance or Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1

Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Recommended Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Cleaning the Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Cleaning the Thermal Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2

Chapter 6 Installation

Installation Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Installation Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Vertical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Horizontal Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

ii Rev.B

Confidential

Wall Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Setting the Installation Position for the Roll Paper Near-End Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

Adjusting the Detecting Point of the Roll Paper Near-End Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4

Setting the Paper Roll Cutting Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5

Setting the Paper Roll Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

Attaching the Power Switch Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8

Setting the DIP Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9

Location of the DIP switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9

DIP switch settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10

Connecting Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12

Setting the NV Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13

Memory Switch Setting Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13

Paper Layout Automatic Setting Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14

Memory Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14

Customized Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16

Serial Communication Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16

Chapter 7 Handling

Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Precautions on Handling the Printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

Precautions on Paper Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3

Part Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3

LEDs and Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4

Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4

Powering the unit ON or OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4

Loading the paper roll . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6

Removing the roll paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7

TM-L90 Service Manual

Appendix A General Specifications

Printing Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

Paper Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

Paper Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2

Autocutter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4

Paper Roll Supply Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5

Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6

Dimensions and Mass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6

Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7

Drawer Kick-out Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8

Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8

Buttons and Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8

Power switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8

Panel Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8

DIP Switches and NV Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-9

Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-9

Panel LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-9

Appendix B Overview of the Mechanisms

Cover Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2

Print/Paper Feed Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3

Thermal Print Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4

Paper Supply Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-5

Changing the paper width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-6

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Autocutter Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-6

Full cut and partial cut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-7

Manual cut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-7

Appendix C Tools Appendix D Parts List

Alphanumeric List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-3

Reference Number List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-6

Overall Exploded Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1

Case Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-1

Printer Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-2

Appendix E Lubrication Points Diagram Appendix F Overview of Electric Circuits

General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-2

Main Circuit Board Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-3

Switch Circuit Board Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-6

Sub Circuit Board Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .F-6

Interface Circuit Board Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-6

Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-7

Test points on the main circuit board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-7

Test Point Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-8

Parts Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-9

Main Circuit Board Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-9

Switch Circuit Board Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-11

Sub Circuit Board Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .F-11

Circuit Board Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-1

Main Circuit Board (1 of 3) (Drawing Number 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-1

Main Circuit Board (2 of 3) (Drawing Number 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-2

Main Circuit Board (3 of 3) (Drawing Number 20) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-3

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TM-L90 Service Manual

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 t o yourself, dama ge to your equipment, or loss of data.

Note:

Notes have important information and useful tips on the operation of your equipment.

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 electric al shock.

❏

To prevent the possibility of electri cal shock, do not per form mainten ance, rep air, or inspection during a thunderstorm.

❏

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 unpl ug the equipment.

❏

Only disassemble this product as de scribed 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.

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Confidential

CAUTION:

❏

When mounting or replacing the paper roll, be car eful not to touch the manual

cutter, because it is sharp and can injure you.

❏

This product contains other metal parts with sharp edges in addition to the cutter.

Touching these parts also may cause injury.

❏

Parts on the circuit board may become hot during operation. Therefore, wait

approximately 10 minutes after turning the power off before touching them.

❏

Note that the thermal print head and paper feed motor become very hot during

normal operation, creating the danger of burn injury. Be sure to wait for about 10

minutes after turning pri nter power off bef ore b eginn ing th e maint enanc e, rep ai r, or

inspection.

Modular Connector

Use the modular connector specifically designed for the cash drawer for this product. Do not connect this connector to an ordinary telephone line.

vi Rev.B

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TM-L90 Service Manual

About this Manual

Aim of the Manual

This manual was cre ate d to provi de th e inf ormat ion on print er m aintena nce an d rep air r equire d by technicians who handle this work.

Contents of the Manual

The configuration of the manual is as follows.

Chapter 1 Product Overview

Chapter 2 Troubleshooting Guide

Chapter 3 Disassembly and Assembly Chapter 4 Adjustment and Settings Chapter 5 Maintenance, Inspection,

Cleaning, and Lubrication

Chapter 6 Installation Chapter 7 Handling Appendix A Features and General

Specifications

Appendix B Overview of the

Mechanisms

Appendix C Tools

Describes features and configurations of the unit.

Explains troubleshooting (to pinpoint the problem area by the symptom).

Describes disassembly and assembly of the unit.

Provides information about adjustment.

Offers information about periodic maintenance and inspection, cleaning, and lubrication of the unit.

Provides information about installation.

Gives information about handling.

Describes major specifications of the unit.

Describes major mechanisms of the unit.

Provides information about tools required for maintenance and repair.

Appendix D Parts list

Appendix E Lubrication Points Diagram Appendix F Ove r view of Electric

Circuits

Rev.B vii

Lists service parts and gives an exploded view of the unit.

Shows a lubrication drawing of the unit.

Provides electric circuit diagrams and explanations about major elements

Confidential

Chapter 1

Product Overview

The TM-L90 is a line-thermal printer for P OS systems that can print o n roll paper or a ticket.

TM-L90 external view

Specifications and Configurations

The TM-L90 is configured by combining features from the list below.

Table 1-1 Specifications and configurations

Features Selection Description

Interface type UB-S01 (RS-232)

Font type

Autocutter setting Partial cut

Paper width selection 38/60/80 mm , etc. For details ab out how to set the paper

Power supply unit type

UB-P02II (IEEE1284 (bidirectional parallel)) etc.

Alphanumeric Japanese Simplified Chinese Traditiona l Chinese Thai Korean

Full cut

Exclusive external power supply unit: PS-175 (North America only)

Use an EPSON-approved in te rfac e boa rd

Use the EPSON-approved main circuit board

For details abou t ho w to set partial or full cut, see Chapter 6, “Installation.”

width, see Cha p t e r 6 , “Installation.”

or PS-180 (power supply packaged specification only) External power supply unit:

Model PS-180 and PS-170

Note: Selections in the table above may be added or changed in the future. dpi: dots per 2 5.4 mm (dots per inch)

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TM-L90 Service Manual

Chapter 2

Troubleshooting Guide

Preparations for Troubleshooting

Before troubleshooting, check and, if necessary, correct the following point.

Roll paper cover does not open (cover open lever does no t move)

1. Lift up and remove the cutter cover by inserting a flathead screwdriver or similar tool into the cutout in the main case assembly and spreading it in the d irection of an a rrow.

2. Return the cutter blade to the normal position by rota ting the autocutter knob in the direction of t he arrow. When it is returned to the normal position, a triangle mark becomes visible through the hole in the autocutter frame.

Triangle

mark

Knob

Cutter cover

Cutout

Main case assembly

3. Lift up the roll pa per cover.

Note:

❏

Besides a paper jam, a foreign object, such as a push pin, can cause the autocutter to lock up. If this is the case, follow the same procedure described above to return the cutter to its normal position.

❏

Do not open the cutter cover unless you find that the roll paper cover does not open.

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Paper is jammed inside the printer

CAUTION:

❏

Take care not to let metal objects come into contact with the thermal head. Metal can damage the head.

❏

Do not touch the thermal head or radiation plate. Printing can cause them to become very hot.

Power off the unit and open the roll paper cover. If you cannot open the roll paper cover, see the previous section.

2. Remove the jammed paper.

Please confirm to be attached the holder guide sheet C(#182) and D(#183) when the paper is jammed in spite of doing the above steps. (Refer to Appendix D-12.)

Before Servicing

Pages vi to viii at the beginning of this manual provide 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 identify the area where a failure occurred.

❏ See Table 2-1 for diagnosing failures by the symptom of the problem. ❏ See Table 2-3 on page 2-5 for diagnosing failures from the ERROR LED code. ❏ See Table F-5 on page Appendix F-7when the failure is on the main circuit board unit.

Note:

The explanation of how to use the self test is on page 2-4. The explanation of power on self checks is on page appendix F-4.

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TM-L90 Service Manual

Symptoms and Solutions

This explains how to find the source of a problem using the symptom. The numbers in the “Checkpoints” 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.

Table 2-1 Symptoms and Checkpoints

Symptom Checkpoints (by Priority)

Power does not turn on. Power on self check is not completed. Or, POWER LED does not light.

1. Check the power supply unit. Check that 24V is coming out of the power supply. (See page F-6.)

2. Check the main circuit board unit . (See pag e F-6.)

3. Unplug the printer. Then unplug each motor or head or FFC’s connector from the main boar d on e by on e; pl ug the prin te r back in, and power it on. This will let you know if any motor has burned out and is pulling down the power. (See page 3-13.)

4. Replace the I/F circuit board. (See page 3-11.)

5. Replace the Sub circuit board assembly . (See pa ge 3-20. )

There are missing dots in the print.

The print is thin . Receipt Pri nting

Unevenness occurs in the concentration of the print.

Paper feed failure. Thermal Printing

Drawer kick operation failure. 1. Replace the main circuit board unit. (See page 3-13.)

Missing characters/misprinted characters/font breakdown.

ThermallPrinting Label printing

Label printing

Receipt Printing Label printing

Label Printing

1. Clean the thermal print head assembly. (See page 5-2.)

2. Replace the thermal print head assembly . (See pag e 3-4 . )

3. Replace the main circuit board unit. (See page 3-13.)

4. Replace the Head FFC. (See page 3-13.)

1. Clean the thermal print head assembly. (See page 5-2.)

2. Setting the memory switch. (See page 6-12.)

3. Replace the thermal print head assembly . (See pag e 3-4. )

4. Replace the main circuit board unit. (See page 3-13.)

1. Clean the thermal print head assembly. (See page 5-2.)

2. Replace the thermal print head assembly . (See pag e 3-4. )

3. Replace the main circuit board unit. (See page 3-13.)

1. Check that the roll paper is properl y load ed . (See pag e 7-6. )

2. Replace the main circuit board unit. (See page 3-13.)

3. Replace the receipt paper feed motor. (See page 3-34.)

2. Replace the Sub circuit board assembly . (See pa ge 3-20. )

1. Check the setting for serial communication conditions by Self-

test. (See page 2-4.) You can change the setting with the DIP switch 2 or memory switch (See page 6-10.). Al so yo u can s et with the ’Printer Status’ function in the TM Printer Service & Support Utility. (See the TM Printer Service & Support Utility Operatation Guide.)

2. Replace the interface cable. (See page 6-11. )

ERROR LED is lit . (When it is flash in g, see page 2-5. )

Close the roll paper cover secure.

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How to Use the Self-test

There are two types of self-tests. ❏ Print tests

Print Tests

Testing the Thermal Printer

Execute this test using the following procedure.

Table 2-2 Running the thermal printer print test

Step Operation Printer Operation

1 Turn the power supply ON while pressing the

FEED button, and continue to push the FEED button untill ERROR LED is li.

2 Press the FEED button after the PAPER OUT LED

flashes.

The printer will print the status of the printer settings. Afterward, the autocutter will cut the roll paper and the PAPER OUT LED wil l flas h .

The print test will be executed. When the prin t te st is completed, the printer will print ***completed***. The printer will enter the normal printing mode when the test is ended.

Note:

You can interrupt the test print by pressing the FEED button during the test. To continue, press the FEED button again.

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TM-L90 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 t he problem. If you cannot determine the cause of the p roblem after checking all the solutions listed, go back to Table 1-1, earl ier in this chapter.

Automaticall y r ecoverable errors

Automatically recoverable errors ar e not abnorma lities.

Table 2-3 Automatically recoverable errors

Error ERROR LED Blinking Pattern Description Recovery

Print head temperature erro r Approx. 320 msec

The temperature of the print head is extremely high.

❏ Recovers automatically when the

print head cools.

Roll paper cover open error Printing is not performed

correctly due to a cover open.

Paper layout error Label paper or the black mark is

not detected, or the paper layout of the paper installed in the printer and t he set t ing o f the paper layout defined by the GS ( E comman d do not match.

❏ Replace the autocutt er unit. Recovers autom at ically when the roll paper cover is closed.

❏ Recovers automatically when

prpper label paper or the black mark installed in the printer.

Note:

With the memory switch, the “roll paper cover open” error can be specified either as an “automatically recoverable error” or as a “recoverable error.”

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Recoverable errors

Table 2-4 Recoverable errors

Error ERROR LED Blinking Patte rn Descri pt i on Remed y

Autocutter error The autocutter does not wo rk

correctly.

Approx. 5.12sec

Paper layout error Label paper or the black mark is

Roll paper cover open error (when an error that can possibly recover is selected) *1)

not detected, or the paper layout of the paper installed in the printer and t he set t ing o f the paper layout defined by the GS ( E comma n d do not match.

Printing is no t perfo r med correctly due to a cover open

❏ Check to see if paper is jammed

around the autocutter. If so that, remove the jammed paper. After then close the roll paper cover, turn it off, and then turn it on again.

❏ Check for paper dust or foreign

particles attached to th e autocutter blade (See the section, “Cleaning.“i n C h apt er 5 for det ails on how to remove these).

❏ Check the cutter motor sub-

assembly. (see page 2-8.) Replace the motor and th e ma in circuit board unit if th e c ut te r motor sub-assembly has been shorted. (See page 3-39, 3-13.)

❏ Replace the main circui t board

unit to see if the printer is repaired. (See page 3-13.) if The printer is repaired, analyze the defective part by referring to “Main Circuit Board Unit Test Points“. (See page Appendix F-6.)

❏ Replace the autocutt er unit. ❏ Confirm if the error happened by

the jammed paper while printing. If so that, remove the jammed paper. After then close the roll paper cover, turn it off, and then turn it on again

❏ Perform the th r es h old value settin g

for detectors. (See Chapter 4.)

❏ Check if the label paper or the

black mark paper installed in the printer is a cause of the problem.

❏ Check if the paper layout of the

paper installed in the printer and the setting of the paper layout defined by the GS ( E comman d match.

❏ Check for paper dust or foreign

particles attached to the LED holder assembly and the black mark paper det ector circui t board assembly.

❏ Replace the LED holder assembly. ❏ Replace th e black mark paper

detector circuit board assembly.

❏ Close the roll paper cover, turn it

off, and then turn it on ag a in .

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TM-L90 Service Manual

Note:

When a paper jam is present in the autocutter, turn off the unit and remove the jammed paper. Then turn it on again.

Non-recoverable errors

CAUTION:

When any error shown below occurs, turn off the power as soon as possible.

Table 2-5 Non-recoverable errors

Error ERROR LED Blinking Pattern

R/W error in memory or gate array After R/W checking, the printer

Approx. 320 msec

Description Remedy

❏ Replace the main circui t board

does not work correctly.

unit. (See page 3-13.)

High voltage error The power supply voltage is

Low voltage error The power supply voltage is

CPU execution error The CPU executes an incorrect

Interface circuit board error Interface circuit board does not

Drive circuit error One of the following was

Approx. 5.12 sec

extremely high.

extremely low.

address.

work correctly.

detected.

1. Print head thermistor.

2. Level drive motor. assembly.

❏ Replace the power supply unit. ❏ Replace the main circui t board

unit. (See page 3-13.)

❏ Replace the power supply unit. ❏ Replace the main circui t board

unit. (See page 3-13.)

❏ Replace the main circui t board

unit. (See page 3-13.)

❏ Check installation status of the

interface circuit board.

❏ Replace the interfa ce circuit

board. (See page 3-11.)

❏ Replace the main circui t board

unit. (See page 3-13.)

❏ Check installation status of the

interface circuit board.

❏ Replace the head FFC. (See page

3-13.)

❏ Replace the thermal pr int head

assembly . (Se e page 3-4.)

❏ Replace the main circui t board

unit. (See page 3-13.)

❏ Replace the interfa ce circuit

board. (See page 3-11.)

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Test Points on the Printer Mechanism

Before you replace the main circuit board to see if the printer is repaired, you need to check the printer mechanism. If the motor or the coils are shorted, replacing the main circuit board will not fix the problem. The following explains how to test the motors and coils.

Table 2-6 Test points on the printer mechanism

Name of Mechanism Part Name Internal Element Function Where to Check Normal Status

Thermal mechanism assembly

Cutter motor subassembly

Paper feed motor

DC brush motor Autocutter drive Remove the cable

connector connecte d to CN8 on the main circuit board. Test between + and -.

4-phase stepping motor

ROTOR

Receipt paper feed

Remove the cable connector connecte d to CN9 on the main circuit board. Test between pin 1 and pin 2 and between pin 3 and pin 4.

There is continuity. (Aproxinately 38 ± 3.8Ω)

Approximately

2.6 Ω (per phase)

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TM-L90 Service Manual

Chapter 3

Disassembly and Assembly

Notes for Assembly and Disassembly

Always observe the following precautions when disassembling and assembling the printer.

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.

❏

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.

❏

Always remove the power supply unit from the printer before working. Power is flowing to the internal circuit boards even if you turn the printer off at the power supply switch. You may damage the pr in ter if you w ork whil e th e power supp ly i s sti ll attached.

❏

Remove all peripheral equipment connected to the printer before starting work.

❏

Do not perform any work t hat is n ot describ ed in this chapt er . Doin g so may resu lt in injury or damage to the printer.

❏

Do not touch the FPC or FFC pins.

❏

Hold circuit boards only by their edges.

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How to Read this Chapte r

Structure of this Chapter

This chapter consists of t he i tems l ist ed in Table 3-1. Reading from the top item to the b ot to m in sequence allows users to disassemble all the serviceable parts.

Table 3-1 Structure of this chapter

1st level 2nd level 3rd level

Disassembly and assembly of the TM-L90

Disassembly and assembly of the printer mechanism

Cutter cover Connector cover I/F circuit board unit Main assembly case Main circuit board un it Cable wiring Roll paper cover unit Roll paper cover unit Platen holder Switch circuit board assembly Sub circuit board assembly Autocutter un it Autocutter un it Thermal print head assembly Hinge cover Label paper guide Reduction gears Label paper holder assembly LED holder assembly and

cover plate spring NE detector assembly Auxiliary holder plate and

side plate guide shaft Circuit board frame Frame R and center frame Front frame Paper feed motor

3-2 Disassembly and Assembly Rev.C

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TM-L90 Service Manual

Shortest Route for Disassembly of Major Parts

The next diagram shows the shortest disassembly route of major parts. Perform disassembly by following this diagram as well as explanations for the target item. For the disassembly procedure of the thermal print head, see page 3-4.

Start

Cutter cover

Thermal print

Connector

cover

head assembly

I/F circuit board

Auto cutter unit

Switch circuit

board assembly

Paper feed

motor

Main assembly

case

Main circuit

board unit

Label paper

holder

unit

N.E. detector

assembly

Sub circuit board

assembly

Representation of Small Parts

The standard small parts used in this chapter (such as screws, washers, and nuts) are all indicated with abbrev iations. For details, see Appendix D, “Parts List.”

Cover detector

assembly

Rev.C Disassembly and Assembly 3-3

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Replacing the Thermal Print Head Assembly

CAUTION:

❏

This job may be performed only after turning off the printer and waiting for approximately 10 minutes. The th ermal print head assembly may be hot, and otherwise, you might get burned.

❏

When performing this job, take anti-static measures, such as wearing a grounded wrist band. Failure to do so may result in thermal print head failure.

❏

Do not touch the print head (portion that appears like a black line, and the adjacent areas) in the th er ma l prin t he ad a sse mbl y. Touc hi ng thi s area may result in thermal print head failure.

❏

When the thermal print head assembly is contaminated or has a deposit of foreign particles, wipe it off with a cotton swab moistened with alcohol.

1. Open the roll paper cover.

2. Remove the cutter cover by spreading area of the main case assembly, as shown below:

Roll paper cover

Cutter cover

Main case assembly

3-4 Disassembly and Assembly Rev.C

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TM-L90 Service Manual

3. Users may choose between partial cut and full cut by adjusting the autocutter unit to the desired position. Check the part shown below to see if the autocutter is set to full cut or partial cut. When you install the autocutter unit, return the unit to the user’s position.

Dowel

The dowel positions are marked “F” and “P.”

To select partial cut: adjust the dowel to the position marked P.

To select full cut: adjust the dowel to the position marked F.

4. Remove the autocutter unit by removing the two S4 screws securing it. Stand the remo ved autocutter unit against the front of the printer.

Autocutter unit

Rev.C Disassembly and Assembly 3-5

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5. While holding the two head holder springs so they do not fly out, pul l ou t t h e spr ing hold er plate.

CAUTION:

Be sure to hold the two head holder springs while removing spring holder plate. Otherwise, head holder springs may suddenly fly out, creating the danger of eye injury.

Head holder springs

Spring holder plate

6. Lift up the therma l print head as sembly and rem ove the head FFC from the therm al print head assembly.

CAUTION:

To prevent static-generated failures, keep the removed thermal print head assembly in an anti-static bag or other suitable container.

Thermal print head assembly

Head holder spring

Spring holder plate

3-6 Disassembly and Assembly Rev.C

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Follow the steps below to assemble the parts.

1. Attach the insulating tape on the new thermal print head assembly, as shown below; then lubricate with G-45 along the surfaces on both ends of the head assembly.

G-45

Insulating ta pe

2. Attach the head FFC to the connector of the thermal print head assembly.

3. Place the thermal print head assembly in its installation position inside the printer.

4. Insert the two head holder springs onto the two dowels on the spring holder plate by rotating them.

TM-L90 Service Manual

G-45

Head holder springs

Spring holder plate

5. Insert the two head holder springs into the groove in the thermal print head assembly.

6. While holding the two head holder springs so they do not fly out, install the spring holder plate.

CAUTION:

Be sure to hold the two head holder springs while installing the spring holder plate. Otherwise, the head holder springs may suddenly fly out, creating the danger of eye injury.

7. Adjust the two head holder springs so they are perpendicular with the thermal print head assembly.

8. Attach the autocutter unit in its installation position. At this time, align the two dowels on the frame assembly with the two slits in the autocutter unit.

Rev.C Disassembly and Assembly 3-7

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9. Set the autocu tter unit to the user’s position (partial cut or full cut).

To select partial cut: adjust the dowel to the position marked P. To select full cut: adjust the dowel to the position marked F.

Dowel

10. Secure the autocutter unit with the two S4 screws.

Note:

• When tightening the screws, do not deform th e frame assembly. This can d ecrease the sh arpness of the cutter.

• Do not tighten the autocutter unit when the dowels are not properly engaged. This can also decrease the sharpness of the cutter.

11. Install the cutter cover.

12. Close the roll paper cover.

3-8 Disassembly and Assembly Rev.C

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TM-L90 Service Manual

Disassembly and Assemb ly of the TM-L90

First Level

Cutter Cover

1. Open the roll paper cover.

2. Remove the cutter cover by spreading area of the main case assembly, as shown below:

Ro ll paper cover

Main case assembly

Cutt er cover

Install in th e reverse seq uence of removal.

Rev.C Disassembly and Assembly 3-9

+ 118 hidden pages

Epson TM-L90 series Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents

For Safe Repair and Maintenance Work

Key to Symbols

Safety Precautions on Maintenance/Repair/Inspection

Modular Connector

About this Manual

Aim of the Manual

Contents of the Manual

Related Documentation

Chapter 1

Product Overview

Chapter 2

Troubleshooting Guide

Preparations for Troubleshooting

Before Servicing

Diagnosing Failures

Symptoms and Solutions

How to Use the Self-test

Print Tests

Troubleshooting Using the ERROR LED

Test Points on the Printer Mechanism

Chapter 3

Disassembly and Assembly

Structure of this Chapter

Shortest Route for Disassembly of Major Parts

Representation of Small Parts

First Level