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PHASERTM 4400 LASER PRINTER Service Manual Warning The following servicing instructions are for use by qualified service personnel only. To avoid personal injury, do not perform any servicing other than that contained in the operating instructions, unless you are qualified to do so. First Printing: June 2002 071-0861-00 Copyright Copyright © 2002, Xerox Corporation. All Rights Reserved. Unpublished rights reserved under the copyright laws of the United States. Contents of this publication may not be reproduced in any form without permission of Xerox Corporation. Copyright protection claimed includes all forms of matters of copyrightable materials and information now allowed by statutory or judicial law or hereinafter granted, including without limitation, material generated from the software programs which are displayed on the screen such as styles, templates, icons, screen displays, looks, etc. XEROX®, The Document Company®, the stylized X®, CentreWare®, and DocuPrint® are registered trademarks of Xerox Corporation. infoSMARTTM, PhaserTM, PhaserPortTM, PhaserSMARTTM, and PhaserToolsTM are trademarks of Xerox Corporation. Total Satisfaction ServicesSM is a service mark of Xerox Corporation. Adobe®, Acrobat® Reader®, and PostScript® are registered trademarks of Adobe Systems Incorporated. Apple®, LaserWriter®, LocalTalk®, Macintosh®, Mac® OS, and AppleTalk®are registered trademarks of Apple Computer Incorporated. PCL® and HP-GL® are registered trademarks of Hewlett-Packard Corporation. MS-DOS® and Windows® are registered trademarks of Microsoft Corporation. Novell® and NetWare® are registered trademarks of Novell, Incorporated. Sun® and Sun Microsystems® are registered trademarks of Sun Microsystems, Incorporated. SPARC® is a registered trademark of SPARC International, Incorporated. SPARCstationTM is a trademark of SPARC International, Incorporated, licensed exclusively to Sun Microsystems, Incorporated. UNIX® is a registered trademark in the US and other countries, licensed exclusively through X/Open Company Limited. This product includes an implementation of LZW licensed under U.S. Patent 4,558,302. Other marks are trademarks or registered trademarks of the companies with which they are associated. ii Phaser 4400 Laser Printer Service Manual Service Terms Manual Terms Various terms are used throughout this manual to either provide additional information on a specific topic or to warn of possible danger that might be present during a procedure or action. Be aware of all symbols and terms when they are used, and always read NOTE, CAUTION and WARNING messages. Note: A NOTE may indicate an operating or maintenance procedure, practice or condition that is necessary to efficiently accomplish a task. A NOTE may also provide additional information related to a specific subject or add a comment on the results achieved through a previous action. Caution: A CAUTION indicates an operating or maintenance procedure, practice or condition that, if not s