HP m304, m305, m404, m405, m329 Troubleshooting Manual
...
Service Manual: Troubleshooting
www.hp.com/support/ljM329MFP
www.hp.com/support/ljM428MFP
www.hp.com/support/ljM429MFP
www.hp.com/videos/LaserJet
www.hp.com/support/ljM304
www.hp.com/support/ljM404
HP LaserJet Pro M304, M305, M404, M405
HP LaserJet Pro MFP M329, M428, M429
1
2
LaserJet Pro M304, M305, M404, M405
LaserJet Pro M329, M428, M429
Troubleshooting Manual
Copyright and License
Trademark Credits
© Copyright 2019 HP 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.
Edition 1, 8/2019
Microsoft®, Windows®, Windows® XP, and
Windows Vista® are U.S. registered trademarks
of Microsoft Corporation.
Conventions used in this guide
TIP: Helpful hints or shortcuts.
Reinstallation tip: Reinstallation helpful hints, shortcuts, or considerations.
NOTE: Information that explains a concept or how to complete a task.
IMPORTANT: Information that help the user to avoid potential printer error conditions.
CAUTION: Procedures that the user must follow to avoid losing data or damaging the printer.
WARNING! Procedures that the user must follow to avoid personal injury, catastrophic loss of data, or extensive
damage to the printer.
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iv Conventions used in this guide ENWW
HP service and support
Learn about HP access to additional service and support information.
Additional service and support for channel partners
Channel partners, go to partner.hp.com, and then use the steps below to access the HP Web-based Interactive
Search Engine (WISE).
Access WISE for Channel partners
1. Select Services & Support, and then select Services Delivery.
2. Select Technical Support, and then select Technical Documentation.
Find information about the following topics
● Service manuals
● Service advisories
● Up-to-date control panel message (CPMD) troubleshooting
● Install and congure
● Printer specications
● Solutions for printer issues and emerging issues
● Remove and replace part instructions and videos
● Warranty and regulatory information
Additional service and support for HP internal personnel
HP internal personnel, go to one of the following Web-based Interactive Search Engine (WISE) sites:
Americas (AMS)
– https://support.hp.com/wise/home/ams-enWISE - English
– https://support.hp.com/wise/home/ams-esWISE - Spanish
– https://support.hp.com/wise/home/ams-ptWISE - Portuguese
– https://support.hp.com/wise/home/ams-frWISE - French
Asia Pacic / Japan (APJ)
○ https://support.hp.com/wise/home/apj-enWISE - English
○ https://support.hp.com/wise/home/apj-jaWISE - Japanese
○ https://support.hp.com/wise/home/apj-koWISE - Korean
○ https://support.hp.com/wise/home/apj-zh-HansWISE - Chinese (simplied)
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○ https://support.hp.com/wise/home/apj-zh-HantWISE - Chinese (traditional)
○ https://support.hp.com/wise/home/apj-thWISE - Thai
Europe / Middle East / Africa (EMEA)
– https://support.hp.com/wise/home/emea-enWISE - English
vi HP service and support ENWW
Revision history
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.
Table -1 Revision history
Revision number Revision date Revision notes
1 8/2019 HP LaserJet Pro M304, M305, M404, M405
HP LaserJet Pro MFP M329, M428, M429
Troubleshooting manual initial release
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viii Revision history ENWW
Table of contents
1 Theory of operation .................................................................................................................................................................................. 1
HP service and support ........................................................................................................................................................... 2
Additional service and support for channel partners .................................................................................... 2
Additional service and support for HP internal personnel ............................................................................ 2
Basic operation ......................................................................................................................................................................... 4
Sequence of operation ........................................................................................................................................ 5
Formatter-control system ...................................................................................................................................................... 6
Power management ............................................................................................................................................ 6
Printer job language (PJL) ................................................................................................................................... 7
Printer management language (PML) .............................................................................................................. 7
Control panel ........................................................................................................................................................ 7
Walk-up USB (MFP only) ..................................................................................................................................... 8
Wireless ................................................................................................................................................................. 8
Low end data model (LEDM) overview ............................................................................................................. 8
CPU ......................................................................................................................................................................... 8
Input/output (I/O) ................................................................................................................................................. 8
USB .................................................................................................................................................... 8
USB hosts ......................................................................................................................................... 8
10/100/1000 networking .............................................................................................................. 9
Fax ..................................................................................................................................................... 9
Memory ................................................................................................................................................................. 9
Firmware ........................................................................................................................................... 9
Nonvolatile random access memory (NVRAM) ........................................................................... 9
Flash memory .................................................................................................................................. 9
Random access memory (RAM) .................................................................................................... 9
HP Memory Enhancement technology (MEt) .............................................................................. 9
Engine-control system .......................................................................................................................................................... 10
DC controller ....................................................................................................................................................... 11
Motors ............................................................................................................................................. 13
Fans ................................................................................................................................................. 13
Solenoids ........................................................................................................................................ 13
Clutches .......................................................................................................................................... 14
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Switches ......................................................................................................................................... 14
Sensors ........................................................................................................................................... 15
Low-voltage power supply .............................................................................................................................. 16
Over-current/over-voltage protection ....................................................................................... 17
Safety ......................................................................................................................... 17
Low-voltage power supply functions ................................................................... 17
High-voltage power supply ............................................................................................................................. 18
High-voltage power supply circuits ........................................................................................... 19
Fuser bias ....................................................................................................................................... 19
Fuser control ...................................................................................................................................................... 19
Fuser circuits .................................................................................................................................. 20
Fuser control functions ................................................................................................................ 21
Fuser heater protection ............................................................................................................... 22
Engine laser scanner system ............................................................................................................................................... 23
Laser/scanner failure detection ...................................................................................................................... 24
Safety .................................................................................................................................................................. 24
Image-formation process ................................................................................................................................ 25
Step 1: Primary charging ............................................................................................................. 28
Step 2: Laser-beam exposure .................................................................................................... 29
Step 3: Development .................................................................................................................... 29
Step 4: Transfer ............................................................................................................................. 30
Step 5: Separation ........................................................................................................................ 31
Step 6: Fusing ................................................................................................................................ 31
Step 7: Drum cleaning .................................................................................................................. 31
Toner cartridges ................................................................................................................................................. 32
Design ............................................................................................................................................. 32
Memory chip .................................................................................................................................. 34
Toner level and cartridge life detection ..................................................................................... 34
Dynamic security ............................................................................................................................................... 35
Input trays/accessories ......................................................................................................................................................... 36
Tray 3 ................................................................................................................................................................... 37
Basic operation .............................................................................................................................. 37
Paper path ................................................................................................................. 37
Paper feeder controller ........................................................................................... 37
Motor control ............................................................................................................ 38
Pickup and feed operation .......................................................................................................... 38
Electrical components, pickup and feed ............................................................... 38
Other functions ......................................................................................................... 39
Jam detection ........................................................................................................... 40
Scanning and image capture system .................................................................................................................................. 41
Document feeder system ..................................................................................................................................................... 42
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Document feeder simplex operation ............................................................................................................. 42
2 Solve problems ....................................................................................................................................................................................... 43
HP service and support ......................................................................................................................................................... 44
Additional service and support for channel partners .................................................................................. 44
Additional service and support for HP internal personnel .......................................................................... 44
Solve problems checklist ...................................................................................................................................................... 46
Solve problems checklist .................................................................................................................................. 46
Print the menu map ..................................................................................................................... 48
Print the conguration page ....................................................................................................... 49
Print the Printer Status Report (includes a partial event log) ................................................ 50
Print the demo log ........................................................................................................................ 51
Troubleshooting process ...................................................................................................................................................... 52
Solve problems checklist .................................................................................................................................. 52
Print the menu map ..................................................................................................................... 53
Print a conguration page ........................................................................................................... 53
Print the Printer Status Report (includes a partial event log) ................................................ 54
Determine the problem source ....................................................................................................................... 54
Pre-troubleshooting checklist .................................................................................................... 54
Troubleshooting owchart .......................................................................................................... 55
Power subsystem .............................................................................................................................................. 56
Power-on checks ........................................................................................................................... 56
Power-on troubleshooting overview .................................................................... 57
Control panel checks ......................................................................................................................................... 63
Tools for troubleshooting ..................................................................................................................................................... 64
Individual component diagnostics .................................................................................................................. 64
LED diagnostics ............................................................................................................................. 64
Network LEDs (network models only) .................................................................. 64
Control panel LEDs ................................................................................................... 64
Engine diagnostics ........................................................................................................................ 65
Engine test ................................................................................................................ 65
Diagrams ............................................................................................................................................................. 66
Diagrams: Block diagrams ........................................................................................................... 66
Cross-sectional view of printer .............................................................................. 66
Cross-sectional view of 550–sheet paper feeder ............................................... 67
Diagrams: Printed circuit assembly (PCA) connector locations ............................................. 68
Diagrams: DC controller connections .................................................................... 68
Paper feeder controller PCA ................................................................................... 69
Diagrams: External plug and port locations ............................................................................. 69
Diagrams: Locations of major components ............................................................................. 71
Major components (printer base) .......................................................................... 71
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Motor and fan ............................................................................................................ 72
Rollers and pads (printer base) .............................................................................. 73
PCAs (printer base) ................................................................................................... 74
Diagrams: Timing chart ................................................................................................................ 75
Diagrams: Circuit diagrams ......................................................................................................... 76
Advanced conguration with HP Embedded Web Server (EWS) and HP Device Toolbox
(Windows) ........................................................................................................................................................... 77
Internal print-quality test pages ..................................................................................................................... 84
Clean the paper path .................................................................................................................... 84
Clean the paper path (LCD control panel) ............................................................ 84
Clean the paper path (touchscreen control panel) ............................................. 84
Print the conguration page ....................................................................................................... 84
Print the conguration page from an LCD control panel ................................... 84
Print the conguration page from a touchscreen control panel ...................... 84
Control panel menus ......................................................................................................................................... 85
2-line control-panel view (SFP models) .................................................................................... 85
Touchscreen control-panel view (MFP models) ....................................................................... 87
Setup menu ................................................................................................................................... 88
Preferences menu .................................................................................................... 88
Network Setup menu .............................................................................................. 90
Wi-Fi Direct menu (wireless models only) ........................................................... 92
Bluetooth low energy menu ................................................................................... 93
Web Services Setup menu ...................................................................................... 93
Tray Management menu ......................................................................................... 93
Paper Setup menu ................................................................................................... 95
Supply Settings menu ............................................................................................. 96
Printer maintenance menu ..................................................................................... 96
Print Settings menu ................................................................................................. 99
Power Management menu ................................................................................... 100
Reports menu ......................................................................................................... 101
Fax Setup menu (M428fdn, M428m, M429fdn, M429fdw) ............................ 102
Security menu ........................................................................................................ 106
Quick Forms menu ................................................................................................. 106
Function specic menus ............................................................................................................ 107
USB menu ............................................................................................................... 107
Fax Menu (M248/M429f models only) ............................................................... 107
Copy menu (M329/M428/M429 models only) .................................................. 110
Scan menu (M329/M428/M429 models only) .................................................. 112
Apps ......................................................................................................................... 112
Print .......................................................................................................................... 112
Quick sets ................................................................................................................ 112
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Hidden menus ............................................................................................................................. 113
Support menu ........................................................................................................ 113
Boot Screen Menu .................................................................................................. 126
Error code and control panel message troubleshooting overview ......................................................... 129
Error codes .................................................................................................................................. 129
How to search for printer documentation .............................................................................. 130
How to search WISE for printer documentation ............................................... 130
How to search GCSN for printer documentation .............................................. 130
Solve paper-handling problems ........................................................................................................................................ 133
Printer feeds incorrect page size .................................................................................................................. 133
Printer pulls from incorrect tray ................................................................................................................... 133
Printer will not duplex or duplexes incorrectly .......................................................................................... 133
Paper does not feed from Tray 2 ................................................................................................................. 134
Output is curled or wrinkled .......................................................................................................................... 134
Printer does not pick up paper or misfeeds ................................................................................................ 135
The printer does not pick up paper ......................................................................................... 135
The printer picks up multiple sheets of paper ....................................................................... 135
The document feeder jams, skews, or picks up multiple sheets of paper (MFP
models) ........................................................................................................................................ 136
Paper does not feed automatically ......................................................................................... 136
Prevent paper jams ............................................................................................................................................................. 137
Clear paper jams .................................................................................................................................................................. 138
Clear paper jams (SFP) ................................................................................................................................... 138
Experiencing frequent or recurring paper jams? ................................................................... 138
Jam locations .............................................................................................................................. 139
Clear paper jams in Tray 1 ........................................................................................................ 140
Clear paper jams in Tray 2 ........................................................................................................ 141
Clear paper jams in optional Tray 3 ......................................................................................... 145
Clear paper jams in the fuser ................................................................................................... 149
Clear paper jams in the output bin .......................................................................................... 152
Clear paper jams in the duplexer ............................................................................................. 155
Clear paper jams (MFP) .................................................................................................................................. 157
Introduction ................................................................................................................................. 157
Experiencing frequent or recurring paper jams? ................................................................... 157
Jam locations .............................................................................................................................. 158
Clear paper jams in the document feeder .............................................................................. 160
Clear paper jams in Tray 1 ........................................................................................................ 163
Clear paper jams in Tray 2 ........................................................................................................ 164
Clear paper jams in optional Tray 3 ......................................................................................... 168
Clear paper jams in the fuser ................................................................................................... 172
Clear paper jams in the output bin .......................................................................................... 175
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Clear paper jams in the duplexer ............................................................................................. 178
Solve image quality problems ........................................................................................................................................... 180
Improve print quality ...................................................................................................................................... 180
Print from a dierent software program ................................................................................ 180
Check the paper-type setting for the print job ...................................................................... 180
Check the paper type setting (Windows) ........................................................... 180
Check the paper type setting (Mac OS X) ........................................................... 181
Check toner-cartridge status .................................................................................................... 181
Clean the printer ......................................................................................................................... 182
Print a cleaning page ............................................................................................. 182
Clean the scanner glass strip and platen ........................................................... 182
Visually inspect the toner cartridge ......................................................................................... 182
Check paper and the printing environment ............................................................................ 183
Step one: Use paper that meets HP specications .......................................... 183
Step two: Check the environment ....................................................................... 183
Calibrate the printer to align the colors .................................................................................. 183
Check other print job settings .................................................................................................. 184
Check the EconoMode settings ........................................................................... 184
Adjust color settings (Windows) .......................................................................... 185
Try a dierent print driver ......................................................................................................... 186
Print quality troubleshooting guide SCOTT ..................................................................................................................... 187
Resolving print quality problems .................................................................................................................. 187
Introduction ................................................................................................................................. 187
Troubleshoot print quality problems ...................................................................................... 187
Repetitive image defect ruler ........................................................................................................................ 193
Use a ruler to measure between repetitive defects ............................................................. 194
Clean the printer .................................................................................................................................................................. 198
Clean the pickup and separation rollers ...................................................................................................... 198
Clean the paper path ...................................................................................................................................... 198
Clean the paper path (LCD control panel) ............................................................................... 198
Clean the paper path (touchscreen control panel) ............................................................... 198
Clean the touchscreen .................................................................................................................................... 198
Clean the scanner glass strip and platen .................................................................................................... 199
Clean the pickup rollers and separation pad in the document feeder ................................................... 200
Solve performance problems ............................................................................................................................................ 201
Factors aecting print performance ............................................................................................................ 201
Print speeds ................................................................................................................................. 201
The product does not print or it prints slowly ............................................................................................ 202
The product does not print ....................................................................................................... 202
The product prints slowly .......................................................................................................... 203
Solve connectivity problems .............................................................................................................................................. 204
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Solve USB connection problems ................................................................................................................... 204
Solve wired network problems ..................................................................................................................... 204
Introduction ................................................................................................................................. 204
Poor physical connection .......................................................................................................... 204
The computer is using the incorrect IP address for the product ........................................ 204
The computer is unable to communicate with the product ................................................ 205
The product is using incorrect link and duplex settings for the network .......................... 205
New software programs might be causing compatibility problems .................................. 205
The computer or workstation might be set up incorrectly .................................................. 205
The product is disabled, or other network settings are incorrect ...................................... 205
Solve wireless network problems ................................................................................................................ 206
Wireless connectivity checklist ................................................................................................. 206
The control panel displays the message: The wireless feature on this product has
been turned o ........................................................................................................................... 207
The printer does not print after the wireless conguration completes ............................ 207
The wireless connection does not work after moving the wireless router or product ... 207
Cannot connect more computers to the wireless product .................................................. 207
The printer does not print, and the computer has a third-party rewall installed .......... 208
The network does not appear in the wireless networks list ............................................... 208
The wireless network is not functioning ................................................................................. 208
Perform a wireless network diagnostic test .......................................................................... 208
Reduce interference on a wireless network .......................................................................... 209
Service/Support menus and Repair Mode functions ..................................................................................................... 210
Service menu ................................................................................................................................................... 210
Support menu .................................................................................................................................................. 215
Printer resets ................................................................................................................................................... 219
Restore the factory-set defaults ............................................................................................. 219
Semi-full reset ............................................................................................................................ 220
OOBE or Cold reset ..................................................................................................................... 220
Repair Mode ..................................................................................................................................................... 221
When using toner cartridges multiple times .......................................................................... 221
Solve fax problems (MFP models only) ............................................................................................................................ 223
Checklist for solving fax problems ............................................................................................................... 223
Perform a fax diagnostic test ........................................................................................................................ 224
Solve general fax problems ........................................................................................................................... 224
Faxes are sending slowly .......................................................................................................... 225
Fax quality is poor ...................................................................................................................... 225
You touched the Cancel button to cancel a fax, but the fax was still sent .................. 226
Not able to locate the fax settings in HP Web Jetadmin ...................................................... 226
The header is appended to the top of the page when the overlay option is enabled .... 226
A mix of names and numbers is in the recipients box .......................................................... 226
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A one-page fax prints as two pages ........................................................................................ 227
A document stops in the document feeder in the middle of faxing ................................... 227
The volume for sounds coming from the fax accessory is too high or too low ............... 227
Use fax over VoIP networks ...................................................................................................... 227
Solve problems receiving faxes .................................................................................................................... 227
Solve problems sending faxes ...................................................................................................................... 232
Fax error messages on the control panel ................................................................................................... 233
The No Fax Detected message displays ................................................................................. 233
The Communication error message appears ........................................................................ 233
No Dial Tone ................................................................................................................................ 234
The Fax is busy message appears ........................................................................................... 235
The No fax answer message appears ..................................................................................... 235
Document feeder paper jam .................................................................................................... 236
The Fax storage is full message appears ............................................................................... 236
Scanner error .............................................................................................................................. 236
The control panel displays a Ready message with no attempt to send the fax .............. 236
The control panel displays the message "Storing page 1" and does not progress
beyond that message ................................................................................................................ 237
Faxes can be received, but not sent ........................................................................................ 237
Printer is password protected .................................................................................................. 237
Unable to use fax functions from the control panel ............................................................. 237
Unable to use speed dials ......................................................................................................... 237
Unable to use group dials ......................................................................................................... 238
Receive a recorded error message from the phone company when trying to send a
fax ................................................................................................................................................. 238
Unable to send a fax when a phone is connected to the printer ........................................ 239
Troubleshoot fax codes and trace reports .................................................................................................. 239
View and interpret fax error codes .......................................................................................... 239
Fax trace report .......................................................................................................................... 240
Fax logs and reports ....................................................................................................................................... 240
Print all fax reports .................................................................................................................... 240
Print individual fax reports ........................................................................................................ 241
Set the fax error report ............................................................................................................. 241
Set the fax-error-correction mode ............................................................................................................... 242
Change the fax speed ..................................................................................................................................... 242
Use fax on a DSL, PBX, or ISDN system ....................................................................................................... 242
DSL ................................................................................................................................................ 242
PBX ............................................................................................................................................... 243
ISDN .............................................................................................................................................. 243
Solve email problems (MFP models only) ....................................................................................................................... 244
Cannot connect to the email server ............................................................................................................. 244
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Validate the SMTP gateway (Windows) ....................................................................................................... 244
Validate the LDAP gateway (Windows) ........................................................................................................ 244
Update the rmware ........................................................................................................................................................... 245
Method one: Update the rmware using the control panel ..................................................................... 245
Method two: Update the rmware using the Firmware Update Utility .................................................. 246
Appendix A Printer specications ......................................................................................................................................................... 247
Printer dimensions M329, M428, and M429 ................................................................................................................... 248
Printer dimensions M304, M305, M404, and M405 ....................................................................................................... 250
Printer space requirements ............................................................................................................................................... 252
Power consumption, electrical specications, and acoustic emissions ...................................................................... 252
Operating-environment range .......................................................................................................................................... 252
Certicate of Volatility ......................................................................................................................................................... 253
Index ........................................................................................................................................................................................................... 261
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List of tables
Table 1-1 Sequence of operation ........................................................................................................................................................... 5
Table 1-2 Motors ..................................................................................................................................................................................... 13
Table 1-3 Fans ......................................................................................................................................................................................... 13
Table 1-4 Solenoids ................................................................................................................................................................................ 13
Table 1-5 Clutches .................................................................................................................................................................................. 14
Table 1-6 Switches .................................................................................................................................................................................. 14
Table 1-7 Sensors ................................................................................................................................................................................... 15
Table 1-9 Low-voltage power supply functions ................................................................................................................................ 17
Table 1-10 High-voltage power supply circuits ................................................................................................................................. 19
Table 1-11 Fuser components .............................................................................................................................................................. 20
Table 1-12 Fuser control functions ...................................................................................................................................................... 21
Table 1-15 Toner cartridge functions .................................................................................................................................................. 33
Table 1-16 Electrical component list, paper feeder .......................................................................................................................... 38
Table 1-17 Motors, paper feeder .......................................................................................................................................................... 38
Table 1-18 Electrical components, pickup and feed ......................................................................................................................... 39
Table 1-19 Other functions, paper feeder .......................................................................................................................................... 39
Table 2-1 Troubleshooting owchart .................................................................................................................................................. 56
Table 2-2 DC controller connectors ...................................................................................................................................................... 68
Table 2-3 Paper feeder controller PCA connectors ........................................................................................................................... 69
Table 2-4 M304, M305, M404, M405 external plugs and ports ...................................................................................................... 69
Table 2-5 M329, M428, M429 external plugs and ports .................................................................................................................. 70
Table 2-6 Major components (printer base) ....................................................................................................................................... 71
Table 2-7 Motor and fan (printer base) ................................................................................................................................................ 72
Table 2-8 Rollers and pads (printer base) ........................................................................................................................................... 73
Table 2-9 Main PCAs (printer base) ...................................................................................................................................................... 74
Table 2-10 2-line control-panel (SFP models) ................................................................................................................................... 85
Table 2-11 Touchscreen control-panel (MFP models) ...................................................................................................................... 87
Table 2-12 Preferences menu .............................................................................................................................................................. 88
Table 2-13 Network Setup menu ......................................................................................................................................................... 90
Table 2-14 Wi-Fi Direct menu ............................................................................................................................................................... 92
Table 2-15 Bluetooth menu .................................................................................................................................................................. 93
Table 2-16 HP Web Services menu ...................................................................................................................................................... 93
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Table 2-17 Tray management menu ................................................................................................................................................... 93
Table 2-18 Paper setup menu .............................................................................................................................................................. 95
Table 2-19 Supply settings menu ........................................................................................................................................................ 96
Table 2-20 Printer maintenance menu ............................................................................................................................................... 96
Table 2-21 Print Settings menu ............................................................................................................................................................ 99
Table 2-22 Power management menu ............................................................................................................................................. 100
Table 2-23 Reports menu ................................................................................................................................................................... 101
Table 2-24 Fax Setup menu ................................................................................................................................................................ 102
Table 2-25 Security menu ................................................................................................................................................................... 106
Table 2-26 Quick Forms menu ........................................................................................................................................................... 106
Table 2-27 USB menu .......................................................................................................................................................................... 107
Table 2-28 Fax Menu ............................................................................................................................................................................ 107
Table 2-29 Copy menu ......................................................................................................................................................................... 110
Table 2-30 Scan menu ......................................................................................................................................................................... 112
Table 2-31 Support Menu ................................................................................................................................................................... 113
Table 2-32 Service menu .................................................................................................................................................................... 121
Table 2-33 Boot screen menu ............................................................................................................................................................ 126
Table 2-34 ERROR CODES: The rst two characters ....................................................................................................................... 129
Table 2-35 Image defects table quick reference ............................................................................................................................. 187
Table 2-36 Light print .......................................................................................................................................................................... 189
Table 2-37 Gray background or dark print ....................................................................................................................................... 189
Table 2-38 Blank page — No print .................................................................................................................................................... 190
Table 2-39 Black page ......................................................................................................................................................................... 190
Table 2-40 Banding defects ................................................................................................................................................................ 190
Table 2-41 Streak defects ................................................................................................................................................................... 191
Table 2-42 Fixing/fuser defects ......................................................................................................................................................... 192
Table 2-43 Image placement defects ............................................................................................................................................... 192
Table 2-44 Output defects .................................................................................................................................................................. 193
Table 2-46 Service menu .................................................................................................................................................................... 210
Table 2-47 Support Menu ................................................................................................................................................................... 215
Table 2-48 Solve problems receiving faxes ..................................................................................................................................... 227
Table 2-49 Solve problems sending faxes ....................................................................................................................................... 232
Table A-1 Operating-environment specications ............................................................................................................................ 252
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List of gures
Figure 1-5 High-voltage power supply circuits .................................................................................................................................. 19
Figure 1-6 Fuser components .............................................................................................................................................................. 20
Figure 1-7 Fuser control ........................................................................................................................................................................ 21
Figure 1-13 Primary charging ............................................................................................................................................................... 28
Figure 1-14 Laser-beam exposure ...................................................................................................................................................... 29
Figure 1-15 Development ..................................................................................................................................................................... 29
Figure 1-16 Primary transfer ................................................................................................................................................................ 30
Figure 1-17 Separation .......................................................................................................................................................................... 31
Figure 1-18 Fusing .................................................................................................................................................................................. 31
Figure 1-19 Drum cleaning .................................................................................................................................................................... 32
Figure 1-20 Toner cartridge system .................................................................................................................................................... 33
Figure 1-21 Optional Tray 3 paper path .............................................................................................................................................. 37
Figure 1-22 Paper feeder controller .................................................................................................................................................... 38
Figure 1-23 Electrical components, pickup and feed ....................................................................................................................... 39
Figure 2-1 Engine test page .................................................................................................................................................................. 58
Figure 2-2 Engine test page .................................................................................................................................................................. 60
Figure 2-3 Engine test page .................................................................................................................................................................. 62
Figure 2-4 Cross-sectional view of printer .......................................................................................................................................... 66
Figure 2-5 Cross-sectional view of 500–sheet paper feeder .......................................................................................................... 67
Figure 2-6 DC controller PCA connectors ............................................................................................................................................ 68
Figure 2-7 Paper feeder controller PCA connectors .......................................................................................................................... 69
Figure 2-8 M304, M305, M404, M405 external plugs and ports locations ................................................................................... 69
Figure 2-9 M329, M428, M429 external plug and port locations ................................................................................................... 70
Figure 2-10 Major components (printer base) ................................................................................................................................... 71
Figure 2-11 Motor and fan .................................................................................................................................................................... 72
Figure 2-12 Rollers and pads (printer base) ....................................................................................................................................... 73
Figure 2-13 Main PCAs (printer base) .................................................................................................................................................. 74
Figure 2-14 General timing chart ......................................................................................................................................................... 75
Figure 2-15 General circuit diagram (printer base) ........................................................................................................................... 76
Figure 2-16 2-line control-panel view (SFP models) ........................................................................................................................ 85
Figure 2-17 Touchscreen control-panel view (MFP models) ........................................................................................................... 87
Figure 2-18 2-line control panel support screen ............................................................................................................................ 113
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Figure 2-19 Touchscreen support screen ......................................................................................................................................... 113
Figure 2-20 2-line control panel service screen .............................................................................................................................. 121
Figure 2-21 Touchscreen control panel ............................................................................................................................................ 121
Figure 2-22 2-line control panels boot screen ................................................................................................................................ 126
Figure 2-23 Touchscreen control panels boot screen .................................................................................................................... 126
Figure 2-24 Sample product search criteria .................................................................................................................................... 131
Figure 2-25 Examples of repetitive defects ..................................................................................................................................... 195
Figure 2-26 Place the ruler on the page ........................................................................................................................................... 196
Figure 2-27 Locate the next repetitive defect ................................................................................................................................. 196
Figure 2-28 Determine the defective assembly .............................................................................................................................. 197
Figure A-1 Dimensions for the M329, M428, and M429 models .................................................................................................. 248
Figure A-2 Dimensions for the optional 550-sheet tray ................................................................................................................ 248
Figure A-3 Dimensions for the printer with the optional 550-sheet tray ................................................................................... 249
Figure A-4 Dimensions for the M304, M305, M404, and M405 models ..................................................................................... 250
Figure A-5 Dimensions for the optional 550-sheet tray ................................................................................................................ 250
Figure A-6 Dimensions for the printer with the optional 550-sheet tray ................................................................................... 251
Figure A-7 Certicate of Volatility M304/M305/M404/M405 non-wireless bundle (1 of 2) .................................................... 253
Figure A-8 Certicate of Volatility M304/M305/M404/M405 non-wireless bundle (2 of 2) .................................................... 254
Figure A-9 Certicate of Volatility M404/M405 wireless bundle (1 of 2) .................................................................................... 255
Figure A-10 Certicate of Volatility M404/M405 wireless bundle (2 of 2) .................................................................................. 256
Figure A-11 Certicate of Volatility M329/M428/M429 non-wireless bundle (1 of 2) .............................................................. 257
Figure A-12 Certicate of Volatility M329/M428/M429 non-wireless bundle (2 of 2) .............................................................. 258
Figure A-13 Certicate of Volatility M329/M428/M429 wireless bundle (1 of 2) ...................................................................... 259
Figure A-14 Certicate of Volatility M329/M428/M429 wireless bundle (2 of 2) ...................................................................... 260
xxii ENWW
1 Theory of operation
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HP service and support
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Basic operation
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Formatter-control system
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Engine-control system
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Engine laser scanner system
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Input trays/accessories
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Scanning and image capture system
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Document feeder system
ENWW 1
HP service and support
Learn about HP access to additional service and support information.
Additional service and support for channel partners
Channel partners, go to partner.hp.com, and then use the steps below to access the HP Web-based Interactive
Search Engine (WISE).
Access WISE for Channel partners
1. Select Services & Support, and then select Services Delivery.
2. Select Technical Support, and then select Technical Documentation.
Find information about the following topics
● Service manuals
● Service advisories
● Up-to-date control panel message (CPMD) troubleshooting
● Install and congure
● Printer specications
● Solutions for printer issues and emerging issues
● Remove and replace part instructions and videos
● Warranty and regulatory information
Additional service and support for HP internal personnel
HP internal personnel, go to one of the following Web-based Interactive Search Engine (WISE) sites:
Americas (AMS)
– https://support.hp.com/wise/home/ams-enWISE - English
– https://support.hp.com/wise/home/ams-esWISE - Spanish
– https://support.hp.com/wise/home/ams-ptWISE - Portuguese
– https://support.hp.com/wise/home/ams-frWISE - French
Asia Pacic / Japan (APJ)
– https://support.hp.com/wise/home/apj-enWISE - English
– https://support.hp.com/wise/home/apj-jaWISE - Japanese
– https://support.hp.com/wise/home/apj-koWISE - Korean
– https://support.hp.com/wise/home/apj-zh-HansWISE - Chinese (simplied)
2 Chapter 1 Theory of operation ENWW
– https://support.hp.com/wise/home/apj-zh-HantWISE - Chinese (traditional)
– https://support.hp.com/wise/home/apj-thWISE - Thai
Europe / Middle East / Africa (EMEA)
– https://support.hp.com/wise/home/emea-enWISE - English
ENWW HP service and support 3
Basic operation
Engine-control system
Laser scanner system
Image-formation system
Pickup, feed, and delivery system
Accessory
Engine-control system
Laser scanner system
Image-formation system
Pickup, feed, and delivery system
Accessor
y
The printer routes all high-level processes through the formatter, which stores font information, processes the
print image, and communicates with the host computer.
The basic printer operation comprises the following systems:
● Engine-control system
● Laser/scanner system
●
Image-formation system
● Pickup, feed, and delivery system
● Accessory (optional paper feeder)
Figure 1-1 Relationship between the main printer systems
4 Chapter 1 Theory of operation ENWW
Sequence of operation
The DC controller PCA controls the operating sequence, as described in the following table.
Table 1-1 Sequence of operation
Period Duration Description
Waiting From the time the power is turned on, the door is
closed, or when the printer exits Sleep mode until the
printer is ready for printing.
Standby From the end of the waiting sequence or the last
rotation until the formatter receives a print command,
or until the printer is turned o.
Initial rotation From the time the formatter receives a print command
until the paper enters the paper path.
Printing From the time the rst sheet of paper enters the paper
path until the last sheet passes through the fuser.
● Heats the fuser lm in the fuser
● Detects the toner cartridge
● Rotates and stops each motor
● Rotates and stops each fan
● Cleans the transfer roller
● Is in the Ready state
● Enters Sleep mode if the formatter sends the
sleep command
● Rotates and stops each fan
● Rotates each motor
● Rotates each fan
● Activates the high-voltage power supply (high-
voltage bias)
● Prepares the laser/scanner unit
● Warms the fuser to the correct temperature
● Forms the image on the photosensitive drums
● Transfers the toner to the paper
Last rotation From the time the last sheet of paper exits the fuser
until the motors stop rotating.
● Fuses the toner image onto the paper
● Stops each motor
● Stops each fan
● Stops the high-voltage power supply (high-
voltage bias)
● Stops the laser/scanner unit
● Turns the fuser heater o
● If another print command is received, the printer
enters the initial rotation period when the last
rotation is complete.
ENWW Basic operation 5
Formatter-control system
The formatter performs the following functions:
● Controlling the sleep delay function
● Receiving and processing print data from the various printer inputs
● Monitoring control-panel functions and relaying printer status information (through the control panel and
the bidirectional input/output)
● Developing and coordinating data placement and timing with the DC controller PCA
● Stores font information
● Communicates with the host computer through the network or the bidirectional interface
The formatter receives a print job from the network or bidirectional interface, wireless connection, or fax
telephone line, and separates it into image information and instructions that control the printing process. The DC
controller PCA synchronizes the image formation system with the paper input and output systems, and then
signals the formatter to send the print image data.
Power management
Use the power management settings to select power saving options.
SFP:
● Sleep delay
● Shutdown mode
● Disable shutdown
MFP:
● Sleep mode
● Shutdown after sleep
● Disable shutdown
This feature conserves power after the printer has been idle for an adjustable length of time. When the printer is
in sleep mode, the control-panel backlight is turned o, but the printer retains all printer settings, downloaded
fonts, and macros. The default setting is a 1 minute idle time. The setting can be changed or turned o from the
control-panel menus.
The printer exits sleep mode and enters the warm-up cycle when any of the following occurs.
● A print job, valid data, or a PML or PJL command is received at the serial port.
● A print job is recieved via wireless or fax.
● The control panel is touched (button press or touchscreen touch depending on model).
● The power button is pressed for 3 seconds or less.
● A document is loaded in the document feeder.
● A live network ethernet cable or fax line is attached.
6 Chapter 1 Theory of operation ENWW
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