HP LaserJet 8550 Printer Service Manual
Contents
1. For the complete PDF manual please visit www LaserPros com O postres Cor LASEN 8550 Printer Copy Module Automatic Document Feeder High Capacity Input Service Manual English HP Copy Module ADF and side HCI for HP Color LaserJet 8550 series printers Service Manual Copyright Information Copyright 2002 Hewlett Packard Company All Rights Reserved Reproduction adaptations or translation without prior written permission is prohibited except as allowed under copyright laws Part number C7834 90902 Second edition February 2002 Printed in USA Hewlett Packard Company 11311 Chinden Boulevard Boise Idaho 83714 U S A Warranty The information contained in this document is subject to change without notice Hewlett Packard makes no warranty of any kind with respect to this information HEWLETT PACKARD SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE Hewlett Packard shall not be liable for any direct indirect incidental consequential or other damage alleged in connection with the furnishing or use of this information NOTICE TO U S GOVERNMENT USERS RESTRICTED RIGHTS COMMERCIAL COMPUTER SOFTWARE Use duplication or disclosure by the Government is subject to restrictions as set forth in subparagraph c 1 ii of the Rights in Technical Data Clause at DFARS 52 227 7013 Trademark Credits CompuServe is a U S2. ce eee eee eee 59 Service mode 1 eee eens 60 4 Adjustments and maintenance Chapter contents 0 0 eee esee 117 OVerVIOW ele ei eee gawd eed Gy Rr E Lee See EUER ads 119 MFP print engine adjustments lille 119 Copy module adjustments llle 121 ADF adjustments 00 cee ee eee 140 Side HCI adjustments 0 0000 c eee eee 159 Periodically replaced parts 0 a 163 Gleanirig PA ae bee Roe ed wow n dx AA 164 UDUGU 7p epar Res RR EE REGE EFWSTESU NADA 174 Contents 3 5 Theory of operation Chapter contents 000 cece esses 175 Introduction wwe Kaka ek Mave oad end wed Rex x RES RE ee ae 177 Notes on the power switch 0 c eee eee 177 Copy module cues eed es ete Y RR a he dds 178 ADF 2 da mas pama WEERXGERSXERRENWIGRRGGRESmm hEu RN Gre 244 Side FIG cine Ba iu DE GG Yo a ee eds 304 6 Removal and replacement Chapter contents 0000 eee eee eee 327 Required tools 0 a a a eee 331 Repair notices 2 cee eee 332 Copy module ince KG REA ea LIN DD Db bn rads 333 Automatic document feeder ADF 377 Side HG s ies aa Reb en tese ae eee eas der res 434 7 Troubleshooting Chapter contents eese 455 System to device troubleshooting A A 457 Copy module troubleshooting llli 460 ADF troubleshooting lille 528 Side HCI troubleshooting 0c ee
3. e eee 535 8 Parts and diagrams Chapter contents 0c cece eee eee ee 547 How to use this chapter 0 0000 e eee eee 551 Printer parts unique to the HP Color LaserJet 8550MFP 552 SE AA wei eR A E T RENS 555 Gopy module cas iwas eee xk epe ee jx Rey ace DR RR ee 558 ADE ph aaa ma BADA eee eee ted eae e LA dante Bales bates 600 Side HOI Er 649 Numerical parts list 0 2 ee ee 672 Alphabetical parts list 0 2 0 2 c eee eee 680 Index For the complete PDF manual please visit www LaserPros com 4 Contents EN
4. trademark of CompuServe Inc MS DOS is a U S registered trademark of Microsoft Corporation Photoshop and PostScript are registered trademarks of Adobe Systems Incorporated TrueType is a U S trademark of Apple Computer Inc UNIX is a registered trademark in the United States and other countries licensed exclusively through X Open Company Limited Safety Information WARNING Electrical Shock Hazard To avoid electrical shock use only supplied power cords and connect only to properly grounded 3 hole wall outlets EN Contents 1 Product information Chapter contents 000 seh 21 Introductionis s re d ah aed Ohare ed Ra Rcge De RR ACER 23 Copy module ee 23 Automatic document feeder ADF 28 Side high capacity input side HCl a 32 Model and serial numbers 2 35 Safety and regulatory information 0000 eae 35 2 Service approach Chapter contents 00 c eee eee eee 37 Service approach overview s sssaaa asorar 39 Parts and supplies 0 00 c eee eee eee 39 Ordering xii da ewe ened a s ate am hole ea ae ead 40 Technical assistance 1 0 0 6 ee 42 Warranty essem EE Hae eb he ale eat eaten ale 46 3 Operational overview Chapter contents 0c cece eee eee 47 Control panel a nd Ex xe X bee oe ex Ree eg 49 Copy module functionality 0 0 0 0 0 cece eee 51 Self diagnostic messageS 00 ce
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