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Q3994A LaserJet 4200Ln Printer

HP LaserJet 4200Ln (Q3994A)

MFG Part Number: Q3994A

Printer Support Linksshow

HP LaserJet 4200/4300 printer series service manual

Q3994A Service Manual

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Manual contents and shortcuts

Printer description

Printer configurations

Model and serial numbers

Site requirements

Printer specifications

Environmental specifications

Paper specifications

Supported sizes and weights of media

Supported types of media

Overhead transparencies

Card stock and heavy paper

Types of print media to avoid

Safety information

Laser safety statement (U.S.)

Print cartridge and toner safety

EMI statement (Korea)

VCCI statement (Japan)

Laser statement (Finland)

Regulatory information

FCC regulations

Environmental product stewardship program

HP Printing Supplies Returns and Recycling program information

Declarations of Conformity

Canadian DOC regulations

Declaration of Conformity

Service approach

Parts and supplies

Service approach

Ordering information

Related documentation and software

Print-cartridge information

HewlettPackard limited warranty statement

Limited warranty for toner cartridge life

Printer operation

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 and changing control-panel menus

Information menu

Retrieve Job menu

Paper Handling menu

Configure Device menu

Printer maintenance

Cleaning the printer and accessories

Cleaning the fuser

Running the cleaning page manually

Cleaning spilled toner

Running the cleaning page automatically

Performing preventative maintenance

Resetting the maintenance-kit counter

Expected life of components

Maintaining the stapler unit

Removing and replacing the stapler unit

Loading staples

Downloading a remote firmware update

Theory of operation

Basic operation of the printer

General descriptions

DC controller PCA

Laser/scanner assembly

Paper pickup system

Paper pickup and feed block

Printing from tray 1

Printing from tray 2

Media skew prevention

Fixing/delivery block

Printer jam detection

Printing from the 500-sheet feeder

Printing from the 1,500-sheet feeder

Envelope feeder

Envelope feeder jam detection

Duplexer jam detection

Stacker and stapler/stacker

Stacker jam detection

Stapler/stacker

Stapler/stacker jam detection

Imageformation system

Electrostatic latentimage formation

Formatter system

Resolution Enhancement technology

Removing and replacing parts

Removal and replacement strategy

After completing service

Before performing service

Screws used in the printer

Parts-removal tree

Printer input tray, and cabinet wheel locks

User-replaceable parts

Print cartridge

Transfer roller

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

Rightside cover

Rear output bin

Controlpanel display

Controlpanel overlay

Controlpanel assembly

Internal components

Formatter assembly

Output delivery assembly

Duplexing pendulum assembly

Tray 2 mediasize sensor

Main cooling fan (left side)

Cooling fan (right side; HP LaserJet 4300 series printer only)

Laser/scanner assembly

Print-cartridge motor (HP LaserJet 4300 series printer only)

Tray 2 lifter-drive assembly

DC controller PCA

Paperpickup assembly,

Main drive assembly

Paper-feed belt assembly

Tray 1 paperpickup assembly

Paper feed assembly

Registration assembly

Transfer assembly

500sheet feeder assembly

1,500sheet feeder assembly

Troubleshooting

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

Controlpanel menus

Using controlpanel menus

Diagnostics menu

Service menu (service PIN codes)

Printer resets and poweron modes

NVRAM initialization

Harddisk initialization

Engine test page

Formatter test page

Interface troubleshooting

Communications checks

EIO troubleshooting

Displaymessage troubleshooting

Criticalerror messages

Status messages

Warning messages

Alphabetical printer messages

Numerical printer messages

Paperpath troubleshooting

Paperjam recovery

Avoiding paper jams

Persistent jams

Media transport problems

Multiple pages feed

Paper is wrinkled or folded

Paper is skewed

Image-formation troubleshooting

Print quality problems associated with media

Overhead transparency defects

Print quality problems associated with jams

Print quality problems associated with the environment

Image defect tables

Repetitive defects troubleshooting

Troubleshooting the stacker and the stapler/stacker

Malfunction errors

Paper transport errors

Component errors

Printer component locations

Main printer parts

Printer switches and sensors

Printer motors and fans

Accessory component locations

500sheet feeder main parts

500sheet feeder switches, sensors, solenoids, and PCAs

1,500sheet feeder main parts

1,500sheet 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

DC controller block diagram

General timing diagrams

Parts and diagrams

Ordering parts, supplies, and getting support

Ordering information

Related documentation and software

Accessories and supplies

How to use the parts lists and diagrams

Parts diagrams and lists

Alphabetical parts list

Numerical parts list

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