HP LaserJet 4345mfp Series
Service Manual
Copyright and License
© 2004 Copyright Hewlett-Packard
Development Company, L.P.
Reproduction, adaptation, or translation
without prior written permission is
prohibited, except as allowed under the
copyright laws.
The information contained in this document
is subject to change without notice.
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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 Q3942-90950
Edition 1, 11/2004
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Table of contents
1 Product information
HP LaserJet 4345mfp configurations......................................................................................................2
HP LaserJet 4345mfp (Q3942A—base model)......................................................................2
HP LaserJet 4345x mfp (Q3943A)..........................................................................................2
HP LaserJet 4345xs mfp (Q3944A)........................................................................................ 3
HP LaserJet 4345xm mfp (Q3945A)......................................................................................3
Features and benefits of the MFP...........................................................................................................4
Functions.................................................................................................................................4
Speed and throughput............................................................................................................4
Resolution...............................................................................................................................4
Memory...................................................................................................................................4
User interface..........................................................................................................................5
Language and fonts ..............................................................................................................5
Copying and sending..............................................................................................................5
Print cartridge..........................................................................................................................5
Paper-handling .......................................................................................................................6
Connectivity.............................................................................................................................6
Environmental features........................................................................................................... 6
Security features..................................................................................................................... 7
Minimum system requirements for e-mail functionality..........................................................7
MFP parts and accessories..................................................................................................................... 8
MFP parts................................................................................................................................8
Interface ports....................................................................................................................... 10
Model and serial numbers....................................................................................................10
Accessories and supplies.....................................................................................................11
Parts compatibility with other HP LaserJet products............................................................12
Moving the MFP.................................................................................................................... 14
Locking and unlocking optional accessories........................................................................14
Site requirements...................................................................................................................................15
Physical specifications.......................................................................................................... 15
Environmental specifications................................................................................................16
MFP specifications................................................................................................................................17
Electrical specifications.........................................................................................................17
Acoustic specifications..........................................................................................................18
Image area............................................................................................................................ 18
Skew specifications...............................................................................................................18
Media specifications..............................................................................................................................19
Printing and paper-storage environment..............................................................................19
Envelopes.............................................................................................................................20
Envelopes that have double side seams.............................................................21
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Envelopes that have adhesive strips or flaps......................................................21
Envelope margins................................................................................................21
Envelope storage.................................................................................................21
Labels....................................................................................................................................22
Label construction................................................................................................22
Transparencies.....................................................................................................................22
Supported types and sizes of print media............................................................................23
Regulatory information..........................................................................................................................28
FCC and Telecom regulations.............................................................................................. 28
FCC regulations...................................................................................................28
Telecom................................................................................................................28
Environmental Product Stewardship program......................................................................29
Protecting the environment..................................................................................29
Ozone production................................................................................................. 29
Energy consumption............................................................................................29
HP LaserJet printing supplies..............................................................................29
Material safety data sheet.................................................................................... 30
For more information............................................................................................ 31
Country-/region-specific safety statements..........................................................................32
Laser safety statement......................................................................................... 32
Canadian DOC statement.................................................................................... 32
Japanese VCCI statement...................................................................................32
Korean EMI statement.........................................................................................32
Finnish laser statement........................................................................................ 33
Australia...............................................................................................................33
Declaration of conformity (HP LaserJet 4345mfp)................................................................................34
Declaration of conformity (HP LaserJet 4345x mfp, 4345xs mfp, and 4345xm mfp)...........................35
2 Service approach
Service approach...................................................................................................................................38
Ordering parts, accessories, and supplies............................................................................................39
Ordering directly from HP.....................................................................................................39
Ordering directly through the embedded Web server (for MFPs that are connected to
a network).............................................................................................................................39
To order directly through the embedded Web server..........................................39
Ordering directly through the HP Toolbox software (for MFPs that are directly
connected to a computer).....................................................................................................39
Hewlett-Packard Limited Warranty Statement......................................................................................40
Print Cartridge Limited Warranty Statement.........................................................................................41
Availability of support and service.........................................................................................................42
HP maintenance agreements................................................................................................................ 42
Priority Onsite Service..........................................................................................................42
Next business day.................................................................................................................42
Installation and maintenance-kit replacement......................................................................42
3 Installation and configuration
Installation checklist...............................................................................................................................44
Connecting to a computer or network...................................................................................................46
Network connection..............................................................................................................46
Parallel connection................................................................................................................46
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Fax connection......................................................................................................................47
Analog faxing........................................................................................................47
Connecting the fax accessory to a phone line....................................47
Configuring and using the fax features...............................................47
Digital faxing.........................................................................................................48
Optional output and input devices......................................................................................................... 49
Security features....................................................................................................................................50
Securing the embedded Web server....................................................................................50
To secure the embedded Web server..................................................................50
Foreign Interface Harness (FIH)........................................................................................... 50
Requirements....................................................................................................... 50
Using the FIH.......................................................................................................50
To enable the FIH portal......................................................................50
To disable the FIH portal ....................................................................51
Secure Disk Erase................................................................................................................51
Data affected........................................................................................................ 52
Gaining access to Secure Disk Erase..................................................................52
Additional Information..........................................................................................52
Job-storage features............................................................................................................. 52
HP DSS authentication.........................................................................................................52
Locking the control-panel menus.......................................................................................... 52
Locking the formatter cage...................................................................................................53
4 Maintenance
Cleaning the MFP.................................................................................................................................. 56
Cleaning the outside of the MFP..........................................................................................56
Cleaning the touchscreen.....................................................................................................56
Cleaning the scanner glass..................................................................................................56
Cleaning the fuser ................................................................................................................56
Running the cleaning page .................................................................................57
To run the cleaning page.....................................................................57
Cleaning the ADF delivery system........................................................................................58
To clean the ADF delivery system.......................................................................58
To clean the ADF rollers......................................................................................59
Calibrating the scanner..........................................................................................................................62
To print the calibration target................................................................................................ 62
Performing preventive maintenance......................................................................................................63
Printer preventive maintenance ........................................................................................... 63
To reset the maintenance-kit counter..................................................................63
The ADF maintenance kit.....................................................................................................64
Managing the print cartridge..................................................................................................................65
HP print cartridges................................................................................................................65
Non-HP print cartridges........................................................................................................65
Print-cartridge authentication................................................................................................ 65
Print-cartridge storage..........................................................................................................65
Print-cartridge life expectancy..............................................................................................65
Checking the supply level.....................................................................................................66
To check the supply level by using the control panel..........................................66
To check the supply level by using the embedded Web server..........................66
To check the supply level by using the HP Toolbox software.............................66
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To check the supply levels by using HP Web Jetadmin......................................66
Cartridge-low and cartridge-out conditions........................................................................... 66
When the cartridge is low on toner or drum life...................................................66
When the cartridge is out of toner or drum life..................................................... 67
Setting the real-time clock.....................................................................................................................68
Setting the date and time...................................................................................................... 68
To set the date format.......................................................................................... 68
To set the date.....................................................................................................68
To set the time format..........................................................................................68
To set the time......................................................................................................69
Setting the wake time............................................................................................................69
To set the wake time............................................................................................69
Setting the sleep delay.........................................................................................................70
To set the sleep delay.......................................................................................... 70
Configuring and verifying an IP address...............................................................................................71
TCP/IP assignment............................................................................................................... 71
Automatic discovery.............................................................................................71
Dynamic host configuration protocol (DHCP)......................................................71
Verifying the TCP/IP configuration........................................................................................71
Changing an IP address.......................................................................................................71
To change an IP address by using HP Web Jetadmin........................................71
To change an IP address by using the embedded Web server..........................72
To change an IP address by using the control panel..........................................72
Upgrading the firmware.........................................................................................................................73
Determining the current level of firmware............................................................................. 73
Downloading the new firmware from the HP Web site.........................................................73
Transferring the new firmware to the MFP...........................................................................73
Using FTP to upgrade the firmware on a network connection............................. 73
To upgrade the firmware on a network connection by using FTP......74
Using HP Web Jetadmin to upgrade the firmware...............................................75
Using MS-DOS commands to upgrade the firmware..........................................75
Upgrading the HP Jetdirect firmware....................................................................................76
5 Theory of operation
Basic operation...................................................................................................................................... 78
Sequence of operation (printer)............................................................................................ 78
Sequence of operation (scanner).........................................................................................79
Formatter system...................................................................................................................................80
Sleep mode........................................................................................................................... 80
Resolution Enhancement technology (REt)..........................................................................80
EconoMode........................................................................................................................... 81
Input/output........................................................................................................................... 81
CPU.......................................................................................................................................81
Memory.................................................................................................................................81
Hard disk..............................................................................................................81
Random-access memory.....................................................................................81
DIMM slots...........................................................................................................81
Flash memory.......................................................................................................82
Firmware flash memory card...............................................................................82
Nonvolatile memory.............................................................................................82
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HP Memory Enhancement technology................................................................82
PJL overview.........................................................................................................................82
PML.......................................................................................................................................82
Control panel.........................................................................................................................82
Scanner interface..................................................................................................................83
Engine-control system........................................................................................................................... 84
DC controller PCA.................................................................................................................84
Motors and fans....................................................................................................................86
Motor and fan functions........................................................................................86
Ambient-temperature detection............................................................................87
Engine power supply circuit..................................................................................................87
Fuser control......................................................................................................................... 88
Fuser over-temperature protection......................................................................89
High-voltage power supply...................................................................................................91
Low-voltage power supply ...................................................................................................92
Overcurrent/overvoltage protection......................................................................................94
Toner detection..................................................................................................................... 94
Cartridge detection................................................................................................................94
Laser/scanner system...........................................................................................................................95
Laser/scanner control...........................................................................................................96
Image-formation system........................................................................................................................ 98
Print cartridge........................................................................................................................99
Cartridge memory................................................................................................99
Image-formation process....................................................................................................100
Pickup, feed, and delivery system....................................................................................................... 102
Pickup-and-feed block........................................................................................................105
Printing from tray 1............................................................................................. 106
Printing from tray 2............................................................................................. 107
Media-size detection.........................................................................108
Cassette media-size detection.........................................108
Media-length detection.....................................................108
Media-width detection....................................................... 108
Cassette pickup operation................................................................. 108
Lifter-driver operation........................................................................110
Multifeed prevention..........................................................................110
Distance-between-pages adjustment................................................ 111
Media-skew prevention......................................................................................112
Feed-speed control............................................................................................114
Fusing and reversing/delivery block...................................................................................115
Fusing.................................................................................................................115
Face-down delivery............................................................................................115
Face-up delivery.................................................................................................116
Jam detection......................................................................................................................118
Pickup delay jam from tray 1..............................................................................118
Pickup delay jam from tray 2..............................................................................118
Pickup stationary jam......................................................................................... 118
Fuser-delivery delay jam.................................................................................... 119
Fuser wrapping jam............................................................................................119
Fuser-delivery stationary jam when feeding regular-size media.......................119
Fuser-delivery stationary jam when feeding custom-size media.......................119
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Reversing delay jam (face-down delivery only).................................................119
Reversing stationary jam (face-down delivery only)..........................................120
Delivery delay jam during face-down delivery...................................................120
Delivery delay jam during face-up delivery........................................................120
Delivery stationary jam during face-down delivery............................................120
Delivery stationary jam during face-up delivery.................................................120
Door-open jam...................................................................................................120
Residual-media jam...........................................................................................121
Printing from the 500-sheet feeder.....................................................................................122
500-sheet feeder pickup and feeding................................................................123
Duplex-printing unit............................................................................................................. 125
Reversing/duplexing pickup...............................................................................125
Duplex printing jam detection.............................................................................126
Duplex-unit-pickup delay jam............................................................127
Duplex-unit stationary jam................................................................. 127
Duplex-unit delay jam........................................................................ 127
3-bin mailbox feed and delivery system.............................................................................128
Stacker mode.....................................................................................................130
Mailbox mode..................................................................................................... 130
Function-separator mode................................................................................... 130
Jam detection..................................................................................................... 130
Feed-delay jam.................................................................................. 130
Feed-stationary jam........................................................................... 131
Residual-media jam........................................................................... 131
Stapler/stacker feed and delivery system........................................................................... 132
Staple mode.......................................................................................................134
Stacker mode.....................................................................................................134
Staple-jam detection..........................................................................................134
Feed-delay jam.................................................................................. 134
Feed-stationary jam........................................................................... 135
Delivery-stationary jam...................................................................... 135
Residual-media jam........................................................................... 135
Stapler unit.........................................................................................................135
Scanner system................................................................................................................................... 137
Electrical system................................................................................................................. 137
Motors and fans..................................................................................................................139
Optical assembly.................................................................................................................139
ADF feed system................................................................................................................141
Jam detection......................................................................................................................141
Residual-media jam...........................................................................................141
ADF pickup jam.................................................................................................. 142
ADF jam.............................................................................................................142
Registration sensor jam.....................................................................142
Read sensor jam...............................................................................142
Exit sensor jam.................................................................................. 142
ADF cover open jam..........................................................................................142
ADF open jam....................................................................................................142
6 Removal and replacement
Removal and replacement strategy.....................................................................................................144
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Description
This is the complete HP Service Repair Manual for the HP LaserJet M4345 MFP. The manual consists of 654 pages in PDF format and includes detailed pictures, diagrams, and step-by-step procedures. It is fully indexed and bookmarked by topic, allowing for quick searches within each chapter. The manual is an original Adobe document, ensuring high quality and perfect printing. Users have the flexibility to print the entire manual or select specific pages. Additionally, zooming in on diagrams or pictures allows for a detailed view of every part. This comprehensive service manual is invaluable for both professional mechanics and DIY enthusiasts.
