HP LaserJet PRO 300 color M351A, HP LaserJet PRO 400 color M451dn/dw/nw, Service Manual & Parts List

LASERJET PRO 300 COLOR LASERJET PRO 400 COLOR Service Manual M351 M451

HP LaserJet Pro 300 color M351 and HP LaserJet Pro 400 color M451 Printers Service Manual

Copyright and License Development Company, L.P. 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 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. Part number: CE955-90964 Edition 1, 1/2012 Trademark Credits Microsoft®, Windows®, Windows® XP, and Windows Vista® are U.S. registered trademarks of Microsoft Corporation. ENERGY STAR and the ENERGY STAR mark are registered U.S. marks. © 2012 Copyright Hewlett-Packard

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

iv Conventions used in this guide ENWW

Table of contents 1 Removal and replacement .................................................................................................................... 1 Removal and replacement strategy ............................................................................................. 2 Introduction .............................................................................................................. 2 Removal and replacement strategy .............................................................................. 2 Electrostatic discharge ............................................................................................... 3 Required tools ........................................................................................................... 4 Types of screws ........................................................................................................ 5 Service approach ..................................................................................................................... 6 Before performing service .......................................................................................... 6 After performing service ............................................................................................. 6 Post-service test ......................................................................................................... 6 Print-quality test .......................................................................................... 6 Parts removal order ................................................................................................... 7 Removal and replacement procedures ........................................................................................ 8 Tray 2 cassette ......................................................................................................... 8 Rollers and pads ....................................................................................................... 9 Replace the transfer roller ............................................................................ 9 Replace the pickup roller ........................................................................... 10 Repalce the separation roller ..................................................................... 12 Reinstall the separation roller ...................................................... 14 Replace the pickup roller and separation pad (Tray 1) .................................. 15 Main assemblies ..................................................................................................... 18 Print-cartridge drawer ............................................................................... 18 DIMM cover ............................................................................................ 20 Right cover .............................................................................................. 21 Reinstall the right cover .............................................................. 23 Rear-upper cover (duplex product) .............................................................. 24 Rear-door stopper and link caps (simplex product) ........................................ 25 Rear door (simplex product) ....................................................................... 26 Rear door (duplex product) ........................................................................ 28 Rear cover and feed guide (simplex product) ............................................... 30 Remove the rear cover and feed guide (simplex product) ................ 30 ENWW v

Rear-lower cover and rear-door links (duplex product) ................................... 34 Remove the rear-lower cover and rear-door links (duplex product) ... 34 Rear-door rib assembly (duplex product) ..................................................... 38 Remove the rear-door rib assembly (duplex product) ...................... 38 Link guide ............................................................................................... 40 Upper-cover assembly ............................................................................... 41 Reinstall the upper cover ............................................................ 43 Left cover ................................................................................................ 44 Remove the left cover ................................................................. 44 Reinstall the left cover ................................................................ 46 Right-front cover and power button ............................................................. 47 Remove the right-front cover and power button .............................. 47 Paper-feed guide assembly ........................................................................ 48 Control-panel assembly ............................................................................. 50 Remove the control-panel assembly .............................................. 50 Right panel .............................................................................................. 52 Remove the right panel .............................................................. 52 Front-door assembly ................................................................................. 57 Remove the front-door assembly .................................................. 57 Reinstall the front-door assembly .................................................. 62 Intermediate transfer belt (ITB) .................................................................... 64 Reinstall the ITB ......................................................................... 67 Drum motor (M1) and developer motor (M2) ............................................... 68 Reinstall the drum motor (M1) and developer motor (M2) ............... 71 Intermediate PCA ..................................................................................... 72 Remove the intermediate PCA ..................................................... 72 Formatter PCA ......................................................................................... 74 Special considerations ............................................................... 74 Remove the formatter PCA .......................................................... 74 DC controller PCA .................................................................................... 76 Special considerations ............................................................... 76 Remove the DC controller PCA .................................................... 76 Fuser motor assembly ............................................................................... 78 Remove the fuser motor assembly ................................................ 78 Reinstall the fuser motor assembly ................................................ 80 High-voltage power-supply PCA ................................................................. 81 Remove the high-voltage power-supply PCA .................................. 81 Color-misregistration sensor assembly PCA .................................................. 84 Remove the color-misregistration sensor assembly PCA ................... 84 Reinstall the color-misregistration sensor assembly ......................... 86 Fan ........................................................................................................ 88 vi ENWW

Duplex reverse-drive assembly ................................................................... 89 Remove the duplex reverse-drive assembly .................................... 89 Fuser ...................................................................................................... 92 Remove the fuser ....................................................................... 92 Reinstall the fuser ...................................................................... 97 Paper-delivery assembly ............................................................................ 98 Remove the paper-delivery assembly ............................................ 98 2 Solve problems ............................................................................................................................... 101 Solve problems checklist ....................................................................................................... 102 Menu map .......................................................................................................................... 102 Troubleshooting process ........................................................................................................ 103 Pretroubleshooting checklist .................................................................................... 103 Power-on checks ................................................................................................... 105 Tools for troubleshooting ....................................................................................................... 106 Engine diagnostics ................................................................................................ 106 Diagrams ............................................................................................................. 106 Plug/jack locations ................................................................................. 106 Location of connectors ............................................................................ 107 DC controller PCA ................................................................... 107 Location of major components ................................................................. 108 Major components .................................................................. 108 Solenoids, clutches, and sensors ............................................... 109 Rollers .................................................................................... 111 Motors and fans ...................................................................... 112 PCAs ..................................................................................... 113 General timing charts ............................................................................. 114 General circuit diagram .......................................................................... 115 CPU/ASIC diagrams .............................................................................. 116 HVT/Toner EMP diagram ........................................................................ 118 Driver PCA diagram ............................................................................... 119 Duplexer PCA diagram ........................................................................... 120 FSR diagram .......................................................................................... 121 Internal print quality test pages ............................................................................... 122 Print quality troubleshooting page ............................................................ 122 Print quality assessment page .................................................................. 122 Print the configuration page ..................................................................... 122 Print-quality troubleshooting tools ............................................................................ 123 Repetitive image defects .......................................................................... 123 Calibrate the product .............................................................................. 123 Control panel menus .............................................................................................. 124 ENWW vii

Reports menu ......................................................................................... 124 Quick Forms menu ................................................................................. 124 System Setup menu ................................................................................. 125 Service menu ......................................................................................... 129 Network Setup menu .............................................................................. 130 Interpret control panel messages ............................................................................. 132 Control panel message types ................................................................... 132 Control panel messages .......................................................................... 132 10.XXXX Supply error .............................................................. 132 49 Error Turn off then on .......................................................... 132 50.X Fuser error Turn off then on ............................................... 133 51.XX Error Turn off then on ..................................................... 133 54.XX Error Turn off then on ..................................................... 133 55.X Error Turn off then on ....................................................... 134 57 Fan error Turn off then on .................................................... 134 59.X Error Turn off then on ....................................................... 134 79 Error Turn off then on .......................................................... 134 79 Service error Turn off then on ............................................... 135 Black cartridge low ................................................................. 135 Black in wrong position ............................................................ 135 Black very low ........................................................................ 135 Cleaning . . . .......................................................................... 136 Cyan cartridge low ................................................................. 136 Cyan in wrong position ............................................................ 136 Cyan very low ........................................................................ 136 Device error Press [OK] ............................................................ 137 Front door open ...................................................................... 137 Genuine HP supply installed ..................................................... 137 Incompatible <color> ............................................................... 137 Incorrect supplies .................................................................... 137 Install <color> cartridge ........................................................... 138 Invalid driver Press [OK] .......................................................... 138 Jam in <location> .................................................................... 138 Jam in tray # Clear jam and then Press [OK] .............................. 138 Load tray # <TYPE> <SIZE> ..................................................... 138 Load tray 1 plain <SIZE> Cleaning Mode [OK] to start ................ 139 Load tray <X> Press [OK] for available media ............................ 139 Load tray 1 <TYPE> <SIZE> ..................................................... 139 Magenta cartridge low ............................................................ 139 Magenta in wrong position ...................................................... 139 Magenta very low ................................................................... 140 viii ENWW

HP LaserJet PRO 300 color M351A, HP LaserJet PRO 400 color M451dn/dw/nw, Service Manual & Parts List

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