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HP Laserjet Professional P1100 Series Printer

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HP Laserjet Professional P1100 Series Printer LASERJET PROFESSIONAL P1100 SERIES PRINTER Service Manual www.hp.com/support/ljp1100series HP LaserJet Professional P1100 Printer series Service Manual Copyright and License Trademark Credits © 2010 Copyright Hewlett-Packard Microsoft®, Windows®, Windows® XP, and Development Company, L.P. Windows Vista® are U.S. registered trademarks of Microsoft Corporation. Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright laws. The information contained herein is subject to change without notice. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty. HP shall not be liable for technical or editorial errors or omissions contained herein. Part number: CE651-90953 Edition 1, 4/2010 Conventions used in this guide TIP: Tips provide helpful hints or shortcuts. NOTE: Notes provide important information to explain a concept or to complete a task. CAUTION: Cautions indicate procedures that you should follow to avoid losing data or damaging the product. WARNING! Warnings alert you to specific procedures that you should follow to avoid personal injury, catastrophic loss of data, or extensive damage to the product. ENWW iii iv Conventions used in this guide ENWW Table of contents 1 Theory of operation ........................................................................................................................................ 1 Basic operation ..................................................................................................................................... 2 Major product systems ......................................................................................................... 2 Product block diagram ......................................................................................................... 2 Sequence of operation ......................................................................................................... 3 Normal sequence of operation ............................................................................ 3 Formatter-control system ..................................................................................................................... 4 Sleep mode .......................................................................................................................... 4 Input/output .......................................................................................................................... 4 CPU ..................................................................................................................................... 4 Memory ................................................................................................................................ 4 Firmware ............................................................................................................. 5 Memory use ........................................................................................................ 5 PJL overview ....................................................................................................................... 5 LEDM overview .................................................................................................................... 5 ACL overview ....................................................................................................................... 5 Control panel ....................................................................................................................... 6 Wireless PCA ....................................................................................................................... 6 Engine-control system .......................................................................................................................... 7 Motors, fans, clutches, solenoids, switches, and sensors ................................................... 8 DC controller operations .................................................................................................... 11 Fuser-control circuit ........................................................................................................... 12 Fuser failure detection ....................................................................................... 13 Fuser temperature control ................................................................................. 14 Fuser protective function ................................................................................... 15 Pressure roller cleaning .................................................................................... 15 Low-voltage power supply ................................................................................................. 16 Overcurrent/overvoltage protection ................................................................... 17 High-voltage power supply ................................................................................................ 18 Laser/scanner system ........................................................................................................ 19 Laser failure detection ....................................................................................... 20 Image-formation system ..................................................................................................................... 21 Electrophotographic process ............................................................................................. 21 Image formation process ................................................................................................... 23 ENWW v Latent-image formation stage ........................................................................... 24 Primary charging .............................................................................. 24 Laser beam exposure ....................................................................... 24 Developing stage .............................................................................................. 25 Print cartridge ................................................................................... 25 Transfer stage ................................................................................................... 26 Fusing stage ..................................................................................... 27 Cleaning stage .................................................................................. 27 Pickup, feed, and delivery system ...................................................................................................... 28 Photo sensors and switches .............................................................................................. 29 Input tray, main-input tray, or priority input slot .................................................................................. 30 Jam detection .................................................................................................................... 30 2 Removal and replacement ........................................................................................................................... 31 Introduction ......................................................................................................................................... 32 Removal and replacement strategy ................................................................................................... 32 Electrostatic discharge ....................................................................................................................... 33 Required tools ................................................................................................................................... 33 Before performing service .................................................................................................................. 34 After performing service ..................................................................................................................... 34 Post-service test ................................................................................................................................. 35 Print-quality test ................................................................................................................. 35 Parts removal order ............................................................................................................................ 36 Pickup roller ........................................................................................................................................ 37 Separation pad ................................................................................................................................... 38 Transfer roller ..................................................................................................................................... 39 Covers ................................................................................................................................................ 40 Input tray or main-input tray ............................................................................................... 40 Output bin tray extension ................................................................................................... 41 Front cover ........................................................................................................................
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