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HP LaserJet Printers
HP LaserJet 4250N Parts List
HP LaserJet 4250N (Q5401A)
MFG Part Number:
Q5401A
43ppm black, 1200 x 1200 DPI
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HP LaserJet 4200/4250/4300/4350 printer series service manual
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Manual contents and shortcuts
Product information
Chapter contents
Printer configurations
Base model
n model
tn model
dtn model
dtns model
dtnsl models
Model and serial numbers
Printer overview
Hardware components
Interface ports
Software components
Operating systems and printer components
Printer drivers
Software for Macintosh computers
Specifications
Hardware specifications
Electrical specifications
Acoustic emissions
Operating environment
Print speed specifications
Media specifications
General guidelines
Supported media weights and sizes
Paper and print media
Printing and storage environment
Supported types of media
Guidelines for using paper
Envelopes
Labels
Transparencies
Card stock and heavy paper
Types of media to avoid
Hewlett-Packard limited warranty statement
Print Cartridge Limited Warranty Statement
Service approach
Regulatory information
FCC regulations
Environmental product stewardship program
HP LaserJet printing supplies
For more information
Material safety data sheet
Regulatory statements
Country-/region-specific safety statements
Canadian DOC statement
Japanese VCCI statement
Korean EMI statement
Laser safety statement
Finnish laser statement
Installation
Chapter contents
Operating environment
Site requirements
Software installation
Operation
Chapter contents
Using the control panel
Control-panel layout
Control-panel lights
Control-panel buttons
Using the printer Help system
Setting the control-panel display language
Settings and defaults
Control-panel menus
Printing control-panel menus
To change a control-panel setting
Retrieve Job menu
Information menu
Paper-handling menu
Configure-device menu
Diagnostics menu (HP LaserJet 4250/4350 only)
Maintenance
Chapter contents
Cleaning the printer and accessories
Cleaning the fuser
Running the cleaning page manually
Cleaning spilled toner
Running the cleaning page automatically
Performing preventive maintenance
Resetting the maintenance-kit counter (LJ 4200/4300)
Maintenance kit part numbers
Resetting the maintenance-kit counter (LJ 4250/4350)
Expected life of components
Maintaining the stapler unit
To remove and replace the stapler unit
Loading staples
Downloading a remote firmware update
Downloading the new firmware to the printer
Remote firmware update through a local Windows port
Remote firmware update for UNIX systems
Remote firmware update through a Windows network
Remote firmware update using FTP on a direct network connection
Mac operating systems
Remote firmware update using FTP through a browser
Remote firmware update using Fetch (Mac OS 8.6 and OS 9.x only)
Remote firmware update using the HP LaserJet utility (Mac OS 8.6 and OS 9.x only)
Remote firmware update using the LPR command
Using HP Web JetAdmin to download the firmware to the printer
Printer messages during firmware update
Troubleshooting a firmware update
Theory of operation
Chapter contents
Introduction
Basic operation of the printer
Control system overview
Image-formation system overview
Laser/scanner system overview
Pickup-and-feed system overview
General descriptions
Dc controller PCA
Power supply
Laser/scanner assembly
Paper-pickup-and-feed system
Pickup-and-feed block
Printing from tray 1
Printing from tray 2
Media-skew prevention
Fuser/delivery block
Jam detection
Printing from the 500-sheet feeder
Printing from the 1,500-sheet feeder
Envelope feeder
Envelope feeder jam detection
Duplexer
Duplexer jam detection
Stacker and stapler/stacker
Stacker
Stacker jam detection
Stapler/stacker
Stapler/stacker jam detection
Image-formation system
Electrostatic latent-image formation
Formatter system
PowerSave (LJ 4200/4200L/4300) or Sleep (LJ 4250/4350) Mode
EconoMode
Input/output
Resolution Enhancement technology
Printer memory
PJL overview
Control panel
PML
Removing and replacing parts
Chapter contents
Removal and replacement strategy
Required tools
After completing service
Before performing service
Screws used in the printer
Parts-removal tree
Printer input tray, and cabinet wheel locks
Dc controller PCA diagram
User-replaceable parts
Print cartridge
Transfer roller
Fuser
Tray 1 pickup roller
Tray 1 separation pad
Tray 2 feed rollers
Covers, tray 1, and the rear output bin
Accessory covers and the tray 2 extension door
Formatter cover
Top cover
Right-side cover
Left-side cover
Front cover
Tray 1
Rear output bin
Control-panel display
Control-panel overlay
Control-panel assembly
Main assemblies
Firmware DIMM (LJ 4200/4300 only)
Formatter assembly
Reinstallation notes, formatter
Installing a new formatter and a new dc controller (LJ 4250/4350 only)
Output-delivery assembly
Duplexing-pendulum assembly
Laser/scanner assembly
Paper-pickup drive assembly
Tray 2 lifter-drive assembly
Dc controller PCA
Installing a new formatter and a new dc controller (LJ 4250/4350 only)
Reinstallation tip
Power supply
Paper-feed belt assembly
Motors and fans
Main cooling fan (left side)
Cooling fan, right side (HP LaserJet 4250/4300/4350 Series printers only)
Print-cartridge motor (HP LaserJet 4250/4300/4350 series printer only)
Main motor
Pickup and feed assemblies
Tray 1 paper-pickup assembly
Paper-feed assembly
Reinstallation notes for the paper-feed assembly
Main drive assembly
Registration assembly
Sensors and switches
Tray 2/500-sheet feeder media-size sensor (PS101)
Tray 1 paper sensor (PS105)
Door switch (SW101)
Solenoids and clutches
Tray 2 pickup solenoid (SL101)
Tray 1 pickup solenoid (SL102)
Feed-roller clutch (CL101)
Accessories
500-sheet feeder assembly
1,500-sheet feeder assembly
Troubleshooting
Chapter contents
Introduction
Troubleshooting process
Initial troubleshooting checklist
Troubleshooting flowchart
Power-on checks
Troubleshooting tools
Information pages
Embedded Web server
Gaining access to the embedded Web server
Printer Status and Alerts software
Control-panel menus
Using control-panel menus
Resets submenu
Diagnostics menu
Service menu (service PIN codes)
Printer resets and power-on modes
Cold reset
NVRAM initialization
Hard-disk initialization
Power-on bypass
Test pages
Engine-test page
Formatter test page
Interface troubleshooting
Communications checks
EIO troubleshooting
Display-message troubleshooting
Alphabetical printer messages
Critical-error messages
Error messages
Status messages
Warning messages
Numerical printer messages
Paper-path troubleshooting
Overview
Jam recovery
Avoiding jams
Persistent jams
Media transport problems
Media is wrinkled or folded
Multiple pages feed
Media is skewed
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 defects
Image defect tables
Repetitive-defects troubleshooting
Troubleshooting the stacker and the stapler/stacker
Initial checks
Jam errors
Malfunction errors
Paper-transport errors
Component errors
Printer-component locations
Main printer parts
Printer switches and sensors
Printer motors and fans
Printer PCAs
Accessory component locations
500-sheet feeder main parts
500-sheet feeder switches, sensors, solenoids, and PCAs
1,500-sheet feeder main parts
1,500-sheet feeder switches, sensors, solenoids, and PCAs
Stapler/stacker stapler assembly
Stacker and stapler/stacker switches and sensors
Stacker and stapler/stacker motors and solenoids
Stacker and stapler/stacker PCAs
Printer and accessory wiring diagrams
HP LaserJet 4200 wiring diagram
HP LaserJet 4250 wiring diagram
HP LaserJet 4300 wiring diagram
HP LaserJet 4350 wiring diagram
500-sheet feeder wiring diagram
1,500-sheet feeder wiring diagram
Duplex accessory wiring diagram
Envelope-feeder-accessory wiring diagram
Stacker-accessory wiring diagram
Stapler/stacker-accessory wiring diagram
Dc controller connectors diagram
General timing diagrams
HP LaserJet 4200 general timing diagram
HP LaserJet 4250 general timing diagram
HP LaserJet 4300 general timing diagram
HP LaserJet 4350 general timing diagram
Stapler/stacker timing diagram
Parts and diagrams
Chapter contents
Ordering parts and supplies
Parts
Related documentation and software
HP Partner Portal
HP service agreements
HP-authorized resellers and support
Supplies
Consumables and accessories
Consumables
Accessories
Memory, fonts, and mass storage
Cables and connectivity
Formatters, laser/scanners, power supplies, and fusers
Assembly locations (1 of 3)
Assembly locations (2 of 3)
Assembly locations (3 of 3)
Covers
Internal components
Accessories
Alphabetical parts list
Numerical parts list
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