epson Epson LX-810 LX-850 Service Manual free download

File name Epson LX-810 LX-850 Service Manual.pdf

LX-810/850 TECHNICAL MANUAL EPSON NOTICE " All rights reserved. Reprc~duction of any part of this manual in any from whatsoever without SEIKO EPSON's express written permission is forbidden. q The contents of this manual are subject to change without notice. - All efforts have been made to ensure the accuracy of the contents 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. 9 Copyright 1989 by SEIKO EPSON CORPORATION Nagano, Japan I REV.-A PRECAUTIONS Precautionary notations throughout the text are categorized 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 always be observed when performing repair/main- tenance procedures. DANGER 1. ALWAYS DISCONNECT THE F'RODUCT FROM BOTH THE POWER SOURCE AND THE H O S T C O M P U T E R BEFORE P E R F O R M I N G A N Y M A I N T E N A N C E O R R E P A I R PROCEDURE. 2. NO WORK SHOULD BE PERFC)RMED 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 AS DICTATED 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 PROD- UCT HAS A PRIMARY-AC RATING DIFFERENT FROM THE AVAILABLE POWER SOURCE, DO NOT CONNECT IT TO THE POWER SOURCE. 3. ALWAYS VERIFY THAT THE EP'SON 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 CIR