Color Laserjet Enterprise Cp4020/Cp4520 Series Printer

COLOR LASERJET ENTERPRISE CP4020/CP4520
SERIES PRINTER

Service Manual

CP4025n
CP4025dn
CP4525n
CP4525dn
CP4525xh

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HP Color LaserJet Enterprise CP4020CP4520 Series Printers
Service Manual

Adobe®, Acrobat®, and PostScript® are
trademarks of Adobe Systems Incorporated.Reproduction, adaptation, or translation
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Java™ is a US trademark of Sun
Microsystems, Inc.

ENERGY STAR and the ENERGY STARmark are registered U.S. marks.

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UNIX® is a registered trademark of The Open
Group.

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PANTONE® is Pantone, Inc's checkstandard trademark for color.

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Edition 1, 10/2009

Microsoft®, Windows®, Windows® XP, and
Windows Vista® are U.S. registered
trademarks of Microsoft Corporation.

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Part number: CC489-90936

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© 2009 Copyright Hewlett-PackardDevelopment Company, L.P.

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Trademark Credits

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Copyright and License

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.

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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

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Conventions used in this guide

ENWW

Table of contents

1 Theory of operation
Basic operation..................................................................................................................................... 2
Sequence of operation ......................................................................................................... 3
Engine-control system .......................................................................................................................... 4
DC controller........................................................................................................................ 5
Solenoids ............................................................................................................ 5
Clutches .............................................................................................................. 6
Switches.............................................................................................................. 6
Sensors ............................................................................................................... 7

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Motors ................................................................................................................. 8
Fans..................................................................................................................................... 9
High-voltage power supply ................................................................................................ 10
Low-voltage power supply ................................................................................................. 12
Overcurrent/overvoltage protection...