LJ8550 Service Manual - English (EN)

English Copy Module Automatic Document Feeder High-Capacity Input Service Manual 8550 Printer

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HP Copy Module, ADF, and side HCI for HP Color LaserJet 8550 series printers _____________ Service Manual

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Copyright Information Warranty Trademark Credits Copyright © 2002 Hewlett- Packard Company The information contained in this document is subject to change without notice. CompuServe™ is a U.S. trademark of CompuServe, Inc. All Rights Reserved. Reproduction, adaptations, or translation without prior written permission is prohibited except as allowed under copyright laws. MS-DOS ® is a U.S. registered trademark of Microsoft Corporation. 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.

Photoshop™ and PostScript ® are registered trademarks of Adobe Systems Incorporated. Part number C7834-90902 Second edition, February 2002 TrueType™ is a U.S. trademark of Apple Computer, Inc. Printed in USA 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. 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 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. To avoid electrical shock, use only supplied power cords and connect only to properly grounded (3-hole) wall outlets. Hewlett-Packard Company 11311 Chinden Boulevard Boise, Idaho 83714 U.S.A.

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Contents

Contents 1 Product information Chapter contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23 Copy module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23 Automatic document feeder (ADF) . . . . . . . . . . . . . . . . . . . . . . . .28 Side high-capacity input (side HCI) . . . . . . . . . . . . . . . . . . . . . . .32 Model and serial numbers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35 Safety and regulatory information . . . . . . . . . . . . . . . . . . . . . . . .35 2 Service approach Chapter contents. . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37 Service approach overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39 Parts and supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39 Ordering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40 Technical assistance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42 Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46 3 Operational overview Chapter contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47 Control panel. . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . .49 Copy module functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51 Self-diagnostic messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59 Service mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60 4 Adjustments and maintenance Chapter contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .117 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .119 MFP print engine adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . .119 Copy module adjustments. . . . . . . . . . . . . . . . . . . . . . . .

. . . . . .121 ADF adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .140 Side HCI adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .159 Periodically replaced parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . .163 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .164 Lubricating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .174 EN Contents 3

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