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EPSON
EPSON TERMINAL PRINTER

FX-870/1170

SERVICE MANUAL

4001461 REV.-A

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NOTICE
“ All rights reserved. Reproduction of any part of this manual in any from whatsoever without SEIKO EPSON’s express written permission is forbidden. “ The contents of this manual are subject to change without notice. “ All efforts have been made to ensure the accuracy of thecontents of this manual. However, should any errors be detected, SEIKO EPSON would greatly appreciate being informed of them. “ The above notwithstanding SEIKO EPSON can assume no responsibility for any errors in this manual or the consequences thereof. @ Copyright 1992 by SEIKO EPSON CORPORATION Nagano, Japan

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PRECAUTIONS
Precautionary notations throughout the text arecategorized relative to 1 ) personal injury, and 2) damage to equipment: DANGER Signals a precaution which, if ignored, could result in serious or fatal personal injury. Great caution should be exercised in performing procedures preceded by a DANGER headings. WARNING Signals a precaution which, if ignored, could result in damage to equipment.

The precautionary measures itemized below should alwaysbe observed when performing repair/maintenance procedures.

DANGER
1 ALWAYS DISCONNECT THE PRODUCT FROM BOTH THE POWER SOURCE AND THE HOST COMPUTER BEFORE PERFORMING ANY MAINTENANCE OR REPAIR PROCEDURE. 2, NO WORK SHOULD BE PERFORMED ON THE UNIT BY PERSONS UNFAMILIAR WITH BASIC SAFETY MEASURES AS DICTATED FOR ALL ELECTRONICS TECHNICIANS IN THEIR LINE OF WORK. 3< WHEN PERFORMING TESTING ASDICTATED WITHIN THIS MANUAL, DO NOT CONNECT THE UNIT TO A POWER SOURCE UNTIL INSTRUCTED TO DO SO. WHEN THE POWER SUPPLY CABLE MUST BE CONNECTED, USE EXTREME CAUTION IN WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS.

WARNING
1. REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON CERTIFIED REPAIR TECHNICIAN. 2. MAKE CERTAIN THAT THE SOURCE VOLTAGE IS THE SAME AS THE RATED VOLTAGE,LISTED ON THE SERIAL NUMBER/RATING PLATE. IF THE EPSON PRODUCT HAS A PRIMARY-AC RATING DIFFERENT FROM THE AVAILABLE POWER SOURCE, DO NOT CONNECT IT TO THE POWER SOURCE. 3. ALWAYS VERIFY THAT THE EPSON PRODUCT HAS BEEN DISCONNECTED FROM THE POWER SOURCE BEFORE REMOVING OR REPLACING PRINTED CIRCUIT BOARDS AND/OR INDIVIDUAL CHIPS. 4. IN ORDER TO PROTECT SENSITIVE /.LP CHIPS AND CIRCUITRY, USE STATICDISCHARGE EQUIPMENT, SUCH AS ANTI-STATIC WRIST STRAPS, WHEN ACCESSING INTERNAL COMPONENTS. 5. REPLACE MALFUNCTIONING COMPONENTS ONLY WITH THOSE COMPONENTS RECOMMENDED BY THE MANUFACTURER; INTRODUCTION OF SECOND-SOURCE ICS OR OTHER NONAPPROVED COMPONENTS MAY DAMAGE THE PRODUCT AND VOID ANY APPLICABLE EPSON WARRANTY.

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PREFACE
This manual describes functions, theory ofelectrical and mechanical operations, maintenance, and repair of the FX-870/l 170. The instructions and procedures included herein are intended for the experienced repair technician, and attention should be given to the precautions on the preceding page. The chapters are organized as follows: Chapter 1 Provides a general product overview, lists specifications, and illustrates the main components of theprinter. Chapter 2 Chapter 3 Describes the theory of printer operation. Includes a step-by-step guide for product disassembly and assembly. Chapter 4 Chapter 5 Chapter 6 Includes a step-by-step guide for adjustment. Provides Epson-approved techniques for troubleshooting. Describes preventive maintenance techniques.

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The contents of this manual are subject to change without notice.

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REVISION SHEET
REVISON A DATE ISSUED June 15, 1992 CHANGE DOCUMENT 1st issue

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TABLE OF CONTENTS
CHAPTER 1. CHAPTER 2. CHAPTER 3. CHAPTER 4. CHAPTER 5. CHAPTER 6, APPENDIX GENERAL DESCRIPTION OPERATING PRINCIPLES DISASSEMBLY AND ASSEMBLY ADJUSTMENTS TROUBLESHOOTING MAINTENANCE

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CHAPTER 1 GENERAL DESCRIPTION...