HP Color LaserJet CP5220 Series Printer Service Manual (EN)

HP Color LaserJet CP5220 Series Printer Service Manual

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Copyright and License © 2009 Copyright Hewlett-Packard Development Company, L.P. Trademark Credits Adobe ® , Acrobat ® , and PostScript ® are trademarks of Adobe Systems Incorporated. Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright laws. Corel® is a trademark or registered trademark of Corel Corporation or Corel Corporation Limited. The information contained herein is subject to change without notice. Microsoft®, Windows®, Windows® XP, and Windows Vista® are U.S. registered trademarks of Microsoft Corporation.

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. UNIX ® is a registered trademark of The Open Group. ENERGY STAR and the ENERGY STAR mark are registered U.S. marks. Part number: CE710-90910 Edition 1, 9/2009

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Table of contents 1 Theory of operation Basic operation ..................................................................................................................................... 2 Major product systems ......................................................................................................... 2 Product block diagram ......................................................................................................... 2 Sequence of operation ......................................................................................................... 3 Normal sequence of operation ............................................................................

3 Formatter-control system ..................................................................................................................... 5 Sleep mode .......................................................................................................................... 5 Input/output .......................................................................................................................... 5 CPU ..................................................................................................................................... 6 Memory ................................................................................................................................

6 Firmware ............................................................................................................. 6 Nonvolatile memory ............................................................................................ 6 PJL overview ....................................................................................................................... 6 PML ..................................................................................................................................... 6 Control panel .......................................................................................................................

6 Engine-control system .......................................................................................................................... 7 DC controller ........................................................................................................................ 8 Motors ............................................................................................................... 11 Fans .................................................................................................................. 13 Fuser-control circuit ...........................................................................................

14 Fuser temperature control ................................................................ 15 Fuser protective function .................................................................. 16 Fuser failure detection ...................................................................... 17 Low-voltage power supply ................................................................................. 18 Overcurrent/overvoltage protection .................................................. 20 High-voltage power supply ................................................................................

21 Laser scanner system ........................................................................................................ 23 Laser failure detection ....................................................................................... 24 Image-formation system ..................................................................................................................... 25 Electrophotographic process ............................................................................................. 25 Image formation process ...................................................................................................

27 Latent-image formation block ............................................................................ 28 Pre-exposure .................................................................................... 28 ENWW iii

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Primary charging .............................................................................. 28 Laser beam exposure ....................................................................... 29 Developing block ............................................................................................... 30 Transfer block ................................................................................................... 31 Primary transfer ................................................................................ 31 Secondary transfer ...........................................................................

31 Separation ........................................................................................ 32 Fusing block ...................................................................................................... 32 ITB cleaning block ............................................................................................. 33 Drum cleaning block .......................................................................................... 33 Print cartridges ...................................................................................................................

34 Memory tag ....................................................................................................... 35 Cartridge presence detection ............................................................................ 35 Toner level detection ......................................................................................... 35 Cartridge life detection ...................................................................................... 35 Developing unit engagement and disengagement control ................................ 35 ITB unit ..............................................................................................................................

37 Primary transfer roller engagement and disengagement control ...................... 38 ITB unit presence detection .............................................................................. 39 ITB cleaning mechanism ................................................................................... 39 Calibration .......................................................................................................................... 40 Color-misregistration control ............................................................................. 40 Environment change control .............................................................................

41 Image stabilization control ................................................................................. 41 Image density control (DMAX) .......................................................... 42 Image halftone control (DHALF) ....................................................... 42 Pickup, feed, and delivery system ...................................................................................................... 43 Photo sensors .................................................................................................................... 44 Motors and solenoids .........................................................................................................

45 Pickup and feed block ........................................................................................................ 45 Cassette pickup ................................................................................................. 45 Cassette multiple-feed prevention ..................................................................... 46 Tray 1 (MP tray) paper pickup ........................................................................................... 47 Tray 1 (MP tray) last-paper detection ................................................................................

48 Paper feed ......................................................................................................................... 49 Skew-feed prevention ....................................................................................... 50 Feed-speed control ........................................................................................... 51 Fusing and delivery block .................................................................................................. 52 Loop control ......................................................................................................

52 Pressure roller pressurization and depressurization control ............................. 53 Output bin full detection .................................................................................... 55 Duplex block (duplex models only) .................................................................................... 56 Jam detection .................................................................................................................... 57 Paper feeder ....................................................................................................................................... 59 iv ENWW

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