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COLOR LASERJET ENTERPRISE CP4020/CP4520
SERIES PRINTER
Service Manual
CP4025n
CP4025dn
CP4525n
CP4525dn
CP4525xh
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HP Color LaserJet Enterprise CP4020- CP4520 Series Printers Service Manual
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Copyright and License Trademark Credits ® ® ® © 2009 Copyright Hewlett-Packard Adobe , Acrobat , and PostScript are Development Company, L.P. trademarks of Adobe Systems Incorporated. Reproduction, adaptation, or translation Corel® is a trademark or registered without prior written permission is prohibited, trademark of Corel Corporation or Corel except as allowed under the copyright laws. Corporation Limited. The information contained herein is subject Intel® Core™ is a trademark of Intel to ch
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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
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iv Conventions used in this guide ENWW
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Table of contents 1 Theory of operation Basic operation ..................................................................................................................................... 2 Sequence of operation ......................................................................................................... 3 Engine-control system .......................................................................................................................... 4 DC controller ................
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Step 6: Secondary transfer ............................................................................... 26 Step 7: Separation ............................................................................................ 27 Step 8: Fusing ................................................................................................... 27 Step 9: ITB cleaning .......................................................................................... 28 Step 10: Drum cleaning ...................
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Before performing service .................................................................................................................. 70 After performing service ..................................................................................................................... 70 Post-service test ................................................................................................................................. 71 Print-quality test ........................................
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Cassette feed guide ......................................................................................................... 118 Secondary transfer assembly .......................................................................................... 119 Reinstall the secondary transfer assembly ..................................................... 120 Separation pad (Tray 1) ................................................................................................... 121 Remove the separati
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Lifter-drive assembly ........................................................................................................ 173 Remove the lifter-drive assembly .................................................................... 173 Lifter base assembly ........................................................................................................ 175 Remove the lifter base assembly .................................................................... 175 Reinstall the lifter base as
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Lifter-drive assembly (optional paper feeder) .................................................................. 230 Remove the lifter-drive assembly (optional paper feeder) .............................. 230 Pickup motor assembly (optional paper feeder) ............................................................. 231 Remove the pickup motor (optional paper feeder) assembly .......................... 231 Controller PCA (optional paper feeder) ...................................................
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S Tray 3 paper present sensor ....................................................... 265 T Tray 3 feed sensor ...................................................................... 265 U Tray 3 paper surface 1 and 2 sensors ........................................ 265 V Tray 3 paper size switches .......................................................... 265 W Tray 4 paper present sensor ...................................................... 265 X Tray 4 feed sensor ............................
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Repetitive defects ruler ................................................................................... 312 Calibrate the product ....................................................................................... 313 Control panel menus ........................................................................................................ 314 Control panel menus ....................................................................................... 314 Show Me How menu ...............
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Envelopes jam or will not feed in the product .................................................................. 405 Output is curled or wrinkled ............................................................................................. 406 Product will not duplex or duplexes incorrectly ................................................................ 406 Use manual print modes .................................................................................................................. 4
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Internal components (7 of 7) ............................................................................................ 450 Cassettes 2-5 ................................................................................................................... 452 Paper pickup assembly .................................................................................................... 454 Tray 1 paper pickup assembly ....................................................................................
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Return and recycling instructions ..................................................................................... 508 United States and Puerto Rico ........................................................................ 508 Multiple returns (more than one cartridge) ..................................... 508 Single returns ................................................................................. 508 Shipping ..........................................................................
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xvi ENWW
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List of tables Table 1-1 Sequence of operation ....................................................................................................................... 3 Table 1-2 Solenoids ........................................................................................................................................... 5 Table 1-3 Switches ............................................................................................................................................. 6 Table
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Table 3-17 Causes and solutions for fuser delivery delay jams ..................................................................... 394 Table 3-18 Causes and solutions for wrapping jams ..................................................................................... 394 Table 3-19 Causes and solutions for fuser delivery stationary jams .............................................................. 395 Table 3-20 Causes and solutions for residual media jams ..................................
