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LASERJET PRO 400
Repair Manual
M401
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HP LaserJet Pro 400 M401 Printer Series Repair Manual
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Copyright and License Trademark Credits © 2012 Copyright Hewlett-Packard Microsoft®, Windows®, Windows® XP, Development Company, L.P. and 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
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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 Removal and replacement ................................................................................................ 1 Removal and replacement strategy ............................................................................................. 2 Electrostatic discharge ............................................................................................... 2 Required tools ..........................................................................................
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Tray 1 solenoid ........................................................................................ 34 Duplex solenoid ....................................................................................... 35 Motors and fans ...................................................................................................... 37 Main motor ............................................................................................. 37 Fan ...................................................
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Index ................................................................................................................................. 99 ENWW vii
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viii ENWW
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List of tables Table 2-1 Order parts, accessories, and supplies .................................................................................... 60 Table 2-2 Related documentation and software ...................................................................................... 60 Table 2-3 Supplies part numbers ........................................................................................................... 60 Table 2-4 Whole-unit replacement part numbers ....................
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x ENWW
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List of figures Figure 1-1 Phillips and Pozidriv screwdriver comparison ............................................................................ 3 Figure 1-2 Parts-removal order ................................................................................................................ 5 Figure 1-3 Remove the MP tray pickup roller ............................................................................................ 6 Figure 1-4 Remove the MP tray separation pad (1 of 5) ......
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Figure 1-33 Remove the laser scanner assembly (2 of 2) .......................................................................... 27 Figure 1-34 Remove the registration assembly (1 of 3) ............................................................................ 28 Figure 1-35 Remove the registration assembly (2 of 3) ............................................................................ 28 Figure 1-36 Remove the registration assembly (3 of 3) .........................................
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Figure 1-74 Remove the optional paper feeder driver PCA (1 of 2) ........................................................... 54 Figure 1-75 Remove the optional paper feeder driver PCA (2 of 2) ........................................................... 55 Figure 1-76 Remove the optional paper feeder paper sensor PCA (1 of 4) ................................................. 55 Figure 1-77 Remove the optional paper feeder paper sensor PCA (2 of 4) .............................................
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xiv ENWW
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1 Removal and replacement ● Removal and replacement strategy ● Service approach ● Removal and replacement procedures ENWW 1
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Removal and replacement strategy WARNING! Turn the product off, wait 5 seconds, and then remove the power cord before attempting to service the product. If this warning is not followed, severe injury can result, in addition to damage to the product. The power must be on for certain functional checks during problem solving. However, the power supply should be disconnected during parts removal. Never operate or service the product with the protective cover removed from the laser scanner assembly.
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Required tools ● #2 Phillips screwdriver with a magnetic tip and a 152 mm (6 in) shaft length ● Small flatblade screwdriver ● Needle-nose pliers ● ESD mat (if one is available) or ESD strap ● Penlight (optional) CAUTION: Always use a Phillips screwdriver (callout 1). Do not use a Pozidriv® screwdriver (callout 2) or any motorized screwdriver. These can damage screws or screw threads. Figure 1-1 Phillips and Pozidriv screwdriver comparison CAUTION: Avoid pulling directly on wires to disconnect
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● Remove the toner cartridge. ● Remove the Tray 2 cassette. After performing service ● Plug in the power cable. ● Reinstall the toner cartridge. ● Reinstall the Tray 2 cassette. ● Load paper in the product. Post-service test Perform the following test to verify that the repair or replacement was successful. Print-quality test 1. Verify that you have completed the necessary reassembly steps. 2. Make sure that the tray contains clean, unmarked paper. 3. Attach the power cord and interface cable or
