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HP LaserJet Printers
HP LaserJet 4345 multifunction Parts
HP LaserJet 4345 multifunction printer (Q3942A)
MFG Part Number:
Q3942A
43ppm black, 1200 x 1200 DPI
Printer Support Links
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HP LaserJet 4345 MFP service manual
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Manual contents and shortcuts
Product information
HP LaserJet 4345mfp configurations
HP LaserJet 4345mfp (Q3942A - base model)
HP LaserJet 4345x mfp (Q3943A)
HP LaserJet 4345xm mfp (Q3945A)
HP LaserJet 4345xs mfp (Q3944A)
Features and benefits of the MFP
Functions
Memory
Resolution
Speed and throughput
Copying and sending
Language and fonts
Print cartridge
User interface
Connectivity
Environmental features
Paper-handling
Minimum system requirements for e-mail functionality
Security features
MFP parts and accessories
MFP parts
Interface ports
Model and serial numbers
Accessories and supplies
Parts compatibility with other HP LaserJet products
Locking and unlocking optional accessories
Moving the MFP
Site requirements
Physical specifications
Environmental specifications
MFP specifications
Electrical specifications
Acoustic specifications
Image area
Skew specifications
Media specifications
Printing and paper-storage environment
Envelopes
Labels
Transparencies
Supported types and sizes of print media
Regulatory information
FCC and Telecom regulations
Environmental Product Stewardship program
Country-/region-specific safety statements
Declaration of conformity (HP LaserJet 4345mfp)
Declaration of conformity (HP LaserJet 4345x mfp, 4345xs mfp, and 4345xm mfp)
Service approach
Service approach
Ordering parts, accessories, and supplies
Ordering directly from HP
Ordering directly through the embedded Web server (for MFPs that are connected to a network)
Ordering directly through the HP Toolbox software (for MFPs that are directly connected to a computer)
Hewlett-Packard Limited Warranty Statement
Print Cartridge Limited Warranty Statement
Availability of support and service
HP maintenance agreements
Installation and maintenance-kit replacement
Next business day
Priority Onsite Service
Installation and configuration
Installation checklist
Connecting to a computer or network
Network connection
Parallel connection
Fax connection
Optional output and input devices
Security features
Foreign Interface Harness (FIH)
Securing the embedded Web server
Secure Disk Erase
HP DSS authentication
Job-storage features
Locking the control‑panel menus
Locking the formatter cage
Maintenance
Cleaning the MFP
Cleaning the fuser
Cleaning the outside of the MFP
Cleaning the scanner glass
Cleaning the touchscreen
Cleaning the ADF delivery system
Calibrating the scanner
To print the calibration target
Performing preventive maintenance
Printer preventive maintenance
The ADF maintenance kit
Managing the print cartridge
HP print cartridges
Non-HP print cartridges
Print-cartridge authentication
Print-cartridge life expectancy
Print-cartridge storage
Cartridge-low and cartridge-out conditions
Checking the supply level
Setting the real-time clock
Setting the date and time
Setting the wake time
Setting the sleep delay
Configuring and verifying an IP address
Changing an IP address
TCP/IP assignment
Verifying the TCP/IP configuration
Upgrading the firmware
Determining the current level of firmware
Downloading the new firmware from the HP Web site
Transferring the new firmware to the MFP
Upgrading the HP Jetdirect firmware
Theory of operation
Basic operation
Sequence of operation (printer)
Sequence of operation (scanner)
Formatter system
Resolution Enhancement technology (REt)
Sleep mode
CPU
EconoMode
Input/output
Memory
Control panel
PJL overview
PML
Scanner interface
Engine-control system
DC controller PCA
Motors and fans
Engine power supply circuit
Fuser control
High-voltage power supply
Low-voltage power supply
Cartridge detection
Overcurrent/overvoltage protection
Toner detection
Laser/scanner system
Laser/scanner control
Image-formation system
Print cartridge
Image-formation process
Pickup, feed, and delivery system
Pickup-and-feed block
Fusing and reversing/delivery block
Jam detection
Printing from the 500-sheet feeder
Duplex-printing unit
3-bin mailbox feed and delivery system
Stapler/stacker feed and delivery system
Scanner system
Electrical system
Motors and fans
Optical assembly
ADF feed system
Jam detection
Removal and replacement
Removal and replacement strategy
Required tools
After completing service
Before performing service
Screws that are used in the MFP
User-replaceable parts
Control-panel overlays
Print cartridge
Control panel
Transfer roller
ADF input tray
ADF pickup and feed rollers
ADF separation pad
ADF delivery guide (clear mylar sheet)
Output-bin assembly
Duplex-printing unit
Fuser-entrance guide
Fuser
Tray 2, 3, 4, or 5 pickup and feed rollers
Tray 1 pickup roller
Scanner filter cover and scanner filter
ADF-hinge flap
Formatter cover and formatter
Hard drive
DIMMs
Flash memory card (firmware)
Fax accessory
Covers, doors, and external panels
Top-cover flatbed flange
Front cover
Back cover
Internal assemblies
Reversing-separation-guide assembly
Reversing assembly
Main fan (FN101) and reversing-unit fan (FN103)
Thermistor (TH3)
Tray 2 jam-access-cover switch (SW105)
Tray 1 assembly
Front-cover support
Tray 1 feed-assembly
Feed-roller assembly
DC controller
Main motor (M101)
DC controller fan (FN104)
Print-cartridge fan (FN102)
Print-cartridge motor (M102)
Top-cover switch (SW101)
Registration assembly
Paper-pickup-drive assembly
Lifter-drive assembly
Power-factor-correction (PFC) power supply
Engine power supply
Paper-feed assembly
Tray 2 detection switch
Paper-size-detection switch (SW102)
Tray 2 paper-present sensor (PS101)
Laser/scanner
Output-bin-full sensor
ADF and scanner components
ADF assembly
Scanner assembly
Scanner glass
Optical unit
Scanner bulb
Inverter PCA
Scanner fan
Scanner home-position sensor
Scanner-controller PCA
ADF components
ADF output-bin extension
ADF white mylar-backing
ADF front cover
ADF rear cover
ADF left-side cover
ADF jam-access cover and latch
ADF leading-edge and paper-present sensors
ADF hinges
500-sheet feeder components
500-sheet-feeder pickup and feed rollers
500-sheet-feeder rear cover
500-sheet-feeder right cover
500-sheet-feeder front cover
500-sheet-feeder upper-left cover
500-sheet-feeder left-side cover
500-sheet-feeder number-plate assembly
500-sheet-cassette front cover
500-sheet-feeder PCA
500-sheet-feeder lifter-drive assembly
500-sheet-feeder paper-size switch
500-sheet-feeder jam-access-cover-open switch
Troubleshooting
Troubleshooting process
Initial troubleshooting checklist
Troubleshooting flowchart
Power-on checks
Control-panel messages
Resolving control-panel messages
Using the MFP help system
Accessory lights for the 3‑bin mailbox and stapler/stacker
Accessory lights
Formatter lights
Copy-board LED
HP Jetdirect LEDs
Fax LED
Heartbeat LED
Jams
Clearing jams from the top-cover and print-cartridge areas
Clearing jams from the optional envelope-feeder area
Clearing jams from the tray 1 area
Clearing jams from the tray 2, 3, 4, or 5 areas
Clearing jams from the optional duplexer
Clearing jams from the output areas
Clearing jams from the fuser
Clearing jams from the ADF
Clearing staple jams
Solving repeated jams
Causes of persistent jams
Using the paper-path test
Using the scanner tests
Image-formation troubleshooting
Media-related print-quality problems
Overhead transparency defects
Print-quality problems that are related to jams
Print-quality problems that are related to the environment
Image-defect examples
Repetitive defect ruler
Media-transport problems
E‑mail problems
To validate the LDAP gateway address
To validate the SMTP gateway address
Fax problems
Network connectivity problems
Loopback test
Troubleshooting network printing problems
Ping test
Functional checks
Engine test
Formatter test
Drum-rotation test
Half self-test
MFP resets
Cold reset
NVRAM initialization
Hard-disk initialization
Tools for troubleshooting
Using the embedded Web server
Using the HP Toolbox
Using HP Web Jetadmin software
Information pages
Diagnostics menu
Individual component diagnostics
Service menu
Service ID
Firmware-stack trace
Troubleshooting the embedded HP Jetdirect print server
Diagrams for troubleshooting
DC controller connections
Scanner-controller PCA connections
Locations of major components
General timing chart
General circuit diagrams
Parts and diagrams
How to order parts, supplies, and accessories
How to use the parts lists and diagrams
Screws that are used in the MFP
Customer-replaceable parts and accessories
Accessories
Customer-replaceable components (print engine)
Customer-replaceable components (ADF and scanner)
Cables and interfaces
Control panel and control-panel overlays
Memory
Print cartridge and maintenance kits
Documentation, software, and training material
Assembly locations
External components
Print-engine internal components
Upper-plate assembly
Internal components (1 of 5)
Internal components (2 of 5)
Internal components (3 of 5)
Internal components (4 of 5)
Internal components (5 of 5)
Electrical/forward assembly
Main drive assembly
Paper-pickup-drive assembly
Lifter-drive assembly
Cassette
Paper-feed roller assembly
Registration assembly
Multipurpose assembly
Reverse assembly
Reverse-separation-guide assembly
Delivery assembly
Fuser
ADF components
ADF assembly
ADF internal components (1 of 3)
ADF internal components (2 of 3)
ADF internal components (3 of 3)
ADF input tray
ADF separation pad
ADF separation-pad case
ADF pickup-roller assembly
ADF pickup-roller cover
ADF mylar-holder assembly
ADF mylar replacement kit
Scanner components
Scanner glass and cover
Scanner-base components
Scanner flatbed-unit assembly
Scanner covers
Scanner-carriage-lock assembly
Scanner-open-sensor assembly
Scanner-motor fan
Scanner motor
Scanner-belt assembly
Scanner slide-rail
Scanner optical assembly
500-sheet feeder components
Assembly locations
External components
500-sheet feeder main body (1 of 2)
500-sheet feeder main body (2 of 2)
500-sheet feeder lifter-drive assembly
500-sheet feeder cassette
Optional devices
Duplex-printing accessory
Stapler/stacker
3-bin mailbox
Alphabetical parts list
Numerical parts list
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