Page
 Warranty
 T e
Conventions
Page
 Contents
Page
 Preventive Maintenance
 Functional Overview
 Removal and Replacement
 Troubleshooting
 Duplexer
Parts and Diagrams
 LaserJet 5/5M/5N Printer
Page
 Contents-10
 Product Information
Printer Features
 Product Family Compatibility Matrix
Product Family Information
 CodeMeaning
Identification
 Printer Identification Label for the HP LaserJet 4/4M
 HP LaserJet 4 and 4 Plus
Specifications
Printer Dimensions
Power Specifications
 Environmental Specifications
Electrical Specifications
 HP LaserJet 4 Plus Documents-Description Part Number
Related Documentation
Printer Documentation
HP LaserJet 4 Documents-Description Part Number
 U t i o n
Safety Information
Product and Laser Safety
 FCC RFI Statement
 Laserturvallisuus Luokan 1 Laserlaite
Laser Statement Sweden/Finland
 Ozone Statement
Toner Safety
 HP FIRST, Europe
Doing Business with HP
Technical Assistance HP Asap 1-800-333-1917 U.S
 Printer Drivers
HP CompuServe Forum
Customer Information Centers
Customer Support Center Assist Line
 Other Areas
European Customer Support Center
 Site Requirements
Site Planning Requirements
 Space Requirements
Printer Space Requirements
 Media Specifications for PC Tray Tray
Print Media Specifications
Media Specifications for MP Tray Tray
 LaserJet 4 Plus, 4M Plus, 5, 5M, and 5N printers
Media Specifications for Optional LC Tray Tray
Media Specifications for Duplex Assembly HP
 Label Construction
Adhesive Labels
 Envelopes
Overhead Transparencies
 Envelope Construction
Specifications for Envelopes
Specifications
Dimensions
 Site Planning and Requirements
 Introduction
Configuration
 Control Panel Keys
Using The Control Panel
See Appendix B for LaserJet 5 information
 Indicator Mode Description
Indicator Lights
 Key Function
Control Panel Key Functions
 Reset Menu Functions
Reset Menu
 Control Panel Menus
 Control Panel Map
 Options Explanation
Printer Menu Items
 Job Menu Items
PCL Menu Items
 Configuration Menu Items
 Parallel Menu Items
Memory Configuration Items
 Test Menu Items
Serial Menu Items
 Protection HP LaserJet 4 only
Printer Features
 Resource Saving HP LaserJet 4 Plus and 5 only
 Buffering HP LaserJet 4 Plus and 5 only
 EconoMode HP LaserJet 4 Plus and 5 only
Resolution Enhancement REt
 Density
 HP LaserJet Utility Macintosh
Remote Control Panel DOS
Select Use Password from the Printer Passwords box
Network Security
 Ascii PJL Escape Sequence
HP JetAdmin Utility Novell Networks
EC %-12345X@PJL JOB PASSWORD=numeric password
Select Lock Printer Control Panel
 Refer to Appendix B for LaserJet 5 information
Service Mode
 Setting the Page Count
 Setting the Cold Reset Default
 Cold Reset
 Self Test Printout Items for the HP LaserJet 4/4M
Understanding the PCL Self Test Printout
 HP LaserJet 4/4M PCL Self Test Printout
 Plus
Self Test Printout Items HP LaserJet 4 Plus/4M
 HP LaserJet 4 Plus/4M Plus PCL Self Test Printout
 Changing the Control Panel Display Language
 Test Print Button Location
Test Print Button
 Test Print Pattern
 Parallel DOS Commands
System Configuration
MS-DOS System Configuration
 Serial MS-DOS Commands
 Parallel Menu
Printer I/O Configuration
Serial Configuration
 Pacing Handshaking
 DB-9 RS-232 Serial Connection HP LaserJet
Serial Cable Pin-outs
 DB-25 RS-232 Serial Connection HP LaserJet 4 Plus/5
C2932A Cable Pinout for 9 to 9 Pin Connector
 DB-25 Serial Connection HP LaserJet
17255D Cable Pinout for 25 to 25 Pin Connector
 10 C2933A Cable Pinout for 9 to 25 Pin Connector
 11 RS-422A Cable Pinout
RS-422A Serial Configuration LaserJet 4 only
 Modular I/O Configuration
 Printer Drivers
Install Printer Drivers and Utilities
How to Obtain Printer Drivers
 DOS Utilities
 Canada
Packing Checklist
Packing the Printer
Repackaging Instructions
 12 Installing the Printer on the Lower Cassette
Installing The Optional Lower Cassette
 13 Pull the cassette tray straight out of the printer
14 Adjust the cassette for the paper size you want to load
 Configuration
 Exec
 20 Slide the cassette back into the Lower Cassette assembly
 21 Remove the Black Plastic Cover
Envelope Feeder Installation
 LaserJet
LaserJet 4 and 4 Plus
 Protecting the Simm Board
Simm Installation
 23 Identifying the Four Simm Slots
 12Minimum Memory Recommendations LaserJet 4 Only
PCL Only PostScript Only Resolution 300 dpi 600 dpi
Memory Requirements
 HP LaserJet 4+/4M+/5/5M/5N
Simm boards
HP LaserJet 4/4M
 Installing the Simm Boards
Accessing the Simm Slots
 25 Installing the Simm Board
 Running a Self Test Printout
Testing a Simm Board
Memory Simm
 Personality Simm PostScript
 Service / Error Messages
Troubleshooting a Simm Board
 Configuration
 Preventive Maintenance
 Life Expectancy of Consumables
Selected Service Consumables
 Maintenance Checkpoints
Service Checkpoints
 Cleaning Your Printer
 Toner Cartridge
 Storing the Toner Cartridge
Saving Toner with EconoMode HP LaserJet 4 Plus and 5 Only
 Removing the Toner Cartridge Sealing Tape
Installing the Toner Cartridge
 Inserting the Toner Cartridge
 Non-HP Toner Cartridges
 Clearing the Toner LOW Message
 Removing the MP Tray Tray 1 Pickup Roller
Periodic Maintenance Procedures
 Removing the MP Tray Tray 1 Separation Pad
 Removing the PC Tray 2 Pickup Roller
 Removing the Lower Cassette Pickup Roller
Removing the Lower Cassette LC or Tray 3 Pickup Roller
 Replacing the Transfer Roller
Removing and Replacing the Transfer Roller
 Replacing the Transfer Roller
Removing the Transfer Roller
 Functional Overview
 DC Controller System
 DC Controller Loads
DC Controller Loads
 Serial Data Flow
Serial Data Communication
 Solenoid Description
Solenoid Signals
Solenoids
 LJ 4 / 4 Plus
Photosensors
 Sensor Description
Photosensor Signals
 Microswitches
 PC Tray 2 and LC Tray 3 Tray Size Sensing System
Microswitch Signals
Switch Description
Switch Settings for PC Tray 2 and LC Tray
 Motors
 Motors Description
Paper Jam Detection
Motors
 Control
Formatter System
 Formatter PCA-Functional Areas
 Data Processing
Memory Management
 PJL Overview
 Image Formation System
Image Formation System
 Drum Sensitivity
Photosensitive Drum
 Drum Cleaning Station
Cleaning Stage
 Primary Charging Roller
Conditioning Stage
 Writing Stage
 11 Drum Signals
 12 Image Development
Developing Stage
 13 Developing Potentials
 14 Transfer of the Toner Image and Paper Separation
Transferring Stage
 15 Fusing the Toner to the Paper
Fusing Stage
 Paper Feed System
 16 Input Paper Feed System Diagram
 17 Paper Feed Assembly Sectional View Part Description
 18 MP Tray Tray 1 to Output Tray Paper Path
Printing from the MP Tray Tray
 Printing from the PC Tray Tray
 Power System
 20 Power System Block Diagram
 Standard Printer Operation
Basic Sequence of Operation
 Timing Diagrams
 21 MP Tray Timing Diagram-HP LaserJet 4/4M
 This a 2 panel pull-out
 Standby Period
PowerSave
Warmup Period
 Initial Rotation Period
Page
 Print Period
Page
 Last Rotation Period
 U t i o n T e
Removal and Replacement
 Required Tools
Required Tools
Hardware Review
 Drawing Description Purpose
Printer Hardware Descriptions
 LJ 4/4 Plus
Removing the Covers
Right Side Cover Removal
 Front Top Cover Screws and Latches
Top Cover Removal
 Control Panel Cable
 Left Side Cover Latches
Left Side Cover Removal
 Releasing the Door Support
Rear Door Removal
 7a Releasing the Door Hinge LaserJet 4/5
 Font Door Removal LaserJet 4 shown
Font Door Cover Removal LJ 5 Right Front Cover Removal
 Font Door Cover Latches
 10 Removing the MP Tray Door
Multi-Purpose MP Tray Tray 1 Door Removal
 11 Remove the Crossmember Bracket
Multi-Purpose MP Tray Tray 1 Removal
 12 Rotate the Tray Down to Release the Hinge from its Slots
 Assemblies Removal
Power Supply Removal
 13b Remove the Sheet Metal Plate LaserJet 4 Plus/5
 15 6-wire and 3-wire Connectors for the Power Supply
 16 Paper Feed Assembly Screws and Connectors
Paper Feed Assembly Removal
 17 MP Tray Opening Cover
 18 Paper Feed Assembly Screws numbered
 19 Hvps Screws 2 and Latches 2 Bottom View
High Voltage Power Supply Hvps Removal
 U t i o n
Fuser Assembly Removal
 21 Control Panel Latches
Control Panel and Overlay Removal
 22 Changing the Control Panel Overlay
 LaserJet
Removing the SIMMs Door
 LaserJet 4 Plus/5
23b Opening the SIMMs Door LaserJet 4 Plus
 24a Formatter Cage Screws Right Side View LaserJet 4 T e
Formatter Cage Removal
 24b Formatter Cage Screws Right Side View LaserJet 4 Plus
 Formatter PCA Removal
 25a Formatter Cover and PCA Mounting Screws LaserJet
LaserJet 4 Formatter PCA
 25b Interface Connector Support Screws LaserJet T e
 Plus
Interface Connector Support Screws LaserJet
LaserJet 4 Plus and 5 Formatter PCA
 DC Controller Removal
27a DC Controller Connectors/Retaining Clips LaserJet T e
 Removal and Replacement
 DC Controller Installation
 28 Leading Edge Registration Adjustment Dimensions
 30 Main Motor Assembly
Main Motor Assembly Removal
 31 Gear Assembly Screws Located behind Main Motor
Gear Assembly Removal
 Fan Removal
Fan Connector
 33 Exhaust Fan Removal Laser Jet 4 shown
 34 Output Assembly Removal
Output Assembly Removal
 Exit Sensor
Paper Exit Sensor PS3 Removal
 36 Scanner Assembly Removal
Scanner Assembly Removal
 Lower Cassette Sensor PCA Removal
Lower Cassette Assemblies
 38 Lower Cassette Upper Front Cover
Lower Cassette Pickup Motor Removal
 39 Lower Cassette Motor
 Replacing Fuser Assembly Parts
 Fuser Assembly Configuration
Fuser Assembly Configuration
Fuser Assembly
 41 Fuser End Cap Removal LaserJet 4 only
Removing the Fuser Roller Heat Lamp
 42 Fuser Wire Harness Cover Removal LaserJet
 42b Fuser Cover End Latches LaserJet 4 Plus
 43 Left Side Fuser Cover
 Bushing on the left side of the Fusing Roller
Gear Side Heat Lamp Connector
 Fuser Gear Cap Removal
Wires in the gear cover slots
 46 Fuser Thermoswitch Connectors
Fuser Assembly Thermoswitch Removal
 Thermistor Removal
47 Thermistor Connector
 48a Upper Fuser Frame Removal LaserJet
 48b Upper Fuser Frame Removal LaserJet 4 Plus
 49 Paper Control PCA Retaining Screws and Latches
Paper Control PCA Removal
 50 Sensor PCA Removal
Sensor PCA Removal
 51 Removing the PS1/PS2 Sensor Assembly
PS1 and PS2 Sensor Assembly Removal
 High Voltage Contact Plate Hvcp and Paper Guide Removal
 52 Guide Plate Cover Screw
 53 Paper Guide Rollers
 54 Cross Member Screws
 55 Left Toner Cartridge Guide Plate Screw
 56 High Voltage Contact and Feed Guide Assembly Latches
 57 Orientation of Hvcp and Left Guide Plate
 58 Right Side PC tray Rail Cover printer on right side
Interconnect PCA Removal
 59 Interconnect PCA latches and AC Connector Mounting Pins
 60 Correct Orientation of AC Connector Notch at Upper Left
 Removal and Replacement
 Message on LJ 5/5M/5N Recommendations
LaserJet 5 Error Map
 LaserJet 5 Error Map
 LaserJet 5 Error Map 7-C
 LaserJet 5 Error Map
 Preliminary Operating Checks
Pre-Troubleshooting Procedures
 Printer Messages
Printer Message Troubleshooting
Message Symptoms and Recommendations
Printer Message Summary Table
 Returns all printer settings to Printing Menu settings,
 This message is displayed when the MIO AUX IO card is
 For serial/Bi-Tronics parallel configuration, the computer
 Refer to the Product Family Compatibility
 Indicates a communications problem between the DC
 Printer identified an internal service error. If this error
 An error state. To clear this message, remove
 Clearable Warnings
 Meaning
Clearable Warning Messages
 Checks Action
Printer Message Troubleshooting Procedures
Blank Display
Blank Display
 MP/PC/LC Tray 1/2/3 Load Message
 Figures 7-14 and 7-15 for locations
MP/PC/LC Tray 1/2/3 Load Message Checks
 PC Tray Size Sensing Microswitches Location
Cassette Size Switches SW603, SW604, SW605 Functional Check
 Paper Size Sensing Lower Cassette
Switch Logic for Cassette Size
 PS4 Check MP Tray Empty Sensor
PC Empty Sensor PS2 Functional Check
 Printer Open Checks
Printer Open Message
 Location of the Top Cover Closed SW601 Actuator
SW601 Functional Check
 PS1 and PS3 Paper Path Sensors & PS5 Paper End Sensor
Paper JAM Message
 Jam Location Checks and Action Required
Paper Jam Troubleshooting Checklist
 PS1 Input/Registration Sensor
PS1 Input/Registration Sensor Check
 Pickup Motor Functional Test M2
PS3 Exit Sensor Check
 Lower Cassette Functional Check
 Toner Low Message
No EP Cart Message
 Toner Cartridge Components
Callout Assembly
 Error Message
 Error Message Recommended Action
Error Checks
 Service Error Fuser Malfunction
 Service Fuser Malfunction Checks
 1151 Error Beam Detect Checks
Fuser Assembly Connector
 Laser/Scanner Assembly Functional Checks
Error Scanner Malfunction
 Main Motor Functional Checks
57 or 57.1 Service Message Main Motor Failure
 58 or 57.2 Service Fan Failure
 Image Defect Summary
 Image Defect Summary
 Image Defect Summary
 Any Faint Print Condition
Black Pages
Possible Cause Action
 Faulty Registration
 Vertical White Streaks
Right-Hand Image Missing
Small Print Voids
Random Horizontal Black Lines
 Repetitive Defects
 Distorted Print
Smeared Print/Improper Fusing
 Image Skew
22Black Pages with Horizontal White Strips
 PS5 Check MP Tray Paper End Sensor Functional Test
Improperly Sized Image
 PS5 Test Sheet
 Large Print Voids
Vertical Dark Streaks
 Background Scatter
LaserJet Family Paper Specifications
 White or Blank Pages
 Half Self-Test Functional Check
Image Formation Troubleshooting
 Drum Rotation Functional Check
 29High Voltage System Checks
High Voltage Power Supply Assembly
 Test Message
Interface Troubleshooting
Communications Check
 Serial MS-DOS Commands
AUTOEXEC.BAT Standard Configurations
Parallel DOS Commands
 Communications Checks
Communications Checks
 HP LaserJet printers are not designed to work
 Troubleshooting Hints
MIO Troubleshooting
 Explanation of Self Test Printout
 10 MIO Staus Information on the Self Test Printout
 Component Locations
Troubleshooting Aids
 12 Major Assembly and Connector Locations 2 Number Part
 13 Major Assembly and Connector Locations 3 Number
 Switch Locations
 15 Optional 500 Sheet Lower Cassette Number Part
 16 DC Controller PCA Layout-LaserJet 4/4M Number Part
 17 DC Controller PCA Layout -LaserJet 4 Plus/5 Number Part
 Number Part
High Voltage PCA Layout
 19 Repetitive Defect Ruler
Repetitive Defect Template
 20 Main Wiring Diagram LJ 4+/5 only
 Color Pin Number
Voltage Test Points
Measuring the DC Voltage Levels
TB 201Voltages
 Troubleshooting
 How To Use the Parts Lists
Parts and Diagrams
 1a Field-Replaceable Assemblies 1
Parts Lists and Illustrations
 1b Field-Replaceable Assemblies 2
 Exchng # Description
Field-Replaceable Assemblies
 Field-Replaceable Assemblies
 Covers and Panels
 Covers and Panels
 3a Top Cover Assembly for LaserJet 4/4+
 Top Cover Assembly
 Cable, Display Panel
 3b Top Cover Assembly for LaserJet
 Overlay Language
 4aInternal Components Section
4a Internal Components 1
 RB1-2111-030CN Shutter, arm RB1-2114-000CN
 4b Internal Components 2
 Lnternal Components Section
 4c Internal Components 3
 Internal Components Section
 C2038-60004 LJ4+ C3919-67901
 4d Internal Components 4
 RB1-2251-000CN Block, Connecting RG5-0521-000CN
 Main Switch Assembly
 Main Switch Assembly
 6a Paper Feed Assembly 1
 6b Paper Feed Assembly 2
 Paper Feed Assembly
 MP Tray Tray 1 Assembly
MP Tray Tray 1 Assembly
 Paper Output Assembly
Paper Output Assembly
 Delivery Sensor Assembly
Delivery Sensor Assembly
 10 Fuser Assembly
 Fuser Assembly
 RS5-0232-000CN
 11 Lower Cassette Base Assembly
Accessory Parts
 Lower Cassette Base Assembly
 Lower Cassette Drive Assembly
Lower Cassette Drive Assembly
 13Lower Cassette Assembly
13 Lower Cassette Assembly
 14 Universal Cassette
 Simm Modules
Universal Cassette
Simm Memory
 Miscellaneous Parts and Accessories
Miscellaneous Parts and Accessories
 Alphanumeric Parts List
Parts List
 PCA
 Parts and Diagrams
 Parts and Diagrams
 Parts and Diagrams
 Parts and Diagrams
 Parts and Diagrams
 Parts and Diagrams
 C2084C +/5
 Parts and Diagrams
 Parts and Diagrams
 Parts and Diagrams
 Parts and Diagrams
 Parts and Diagrams
 Parts and Diagrams
 Parts and Diagrams
 Parts and Diagrams
 Duplexer
 Figure A-1 Duplexer Paper Path
 Holding Tray
Switchback Assembly
Duplex Printing
 Figure A-2 Duplexer Major Components
 Electrical Overview
Figure A-3 Electrical Block Diagram
 LJ 4 +
Installing the Optional Duplexer
 Figure A-4 Duplexer Installation/Removal
 R n i n g U t i o n
Removal and Replacement
Required Tools
 Removing the Covers
Removing the Switchback Covers
 Figure A-6
Removing the Side Cover on Power Side
 Figure A-7 Side Cover on Gear Side
Removing the Side Cover on Gear Side
 Figure A-8 Latch Location on Underside of Duplexer
 Removing the Front Cover
Removing the Back Cover
 Removing the Fan/Motor/Solenoid/Sensor
Removing Internal Duplexer Components
 Figure A-11 Switchback Paper Guide
Removing the Switchback Paper Guide
 Figure A-12 Wire Routing and Upper Switchback Guide Screw
Removing the Paper Guide Assembly
 Figure A-13 Solenoid Arm
Removing the Paper Roller
 Figure A-14 Upper Paper Guide Sheet Metal
 Figure A-15 Gears on Paper Roller
 Figure A-16
Removing the Control PCA
 Figure A-17 Control PCA
 Figure A-18 Power PCA
Removing the Power PCA
 Removing the Holding Tray Center Paper Guide
Figure A-19 Plate on Power PCA Side of Duplexer
 Figure A-20 Holding Tray Belt Cover Plate
Removing the Holding Tray Belt
 Figure A-21 Holding Tray Gears and Belt
 Figure A-22 Holding Tray Paper Sensor
Removing the Holding Tray Paper Sensor
 Figure A-23 Switchback Assembly Hinge Pins
Removing the Switchback Assembly
 Parts and Diagrams for the Duplexer
 Figure A-24 Duplex External Covers
 Table A-24 Duplex External Covers Description
 Figure A-25a Duplex Feeder Assembly 1
 Figure A-25b Duplex Feeder Assembly 2
 Table A-25 Duplex Feed Assembly Description
 RF1-3817-00017
 Figure A-26a Duplex Switchback Assembly 1
 Figure A-26b Duplex Switchback Assembly 2
 Table A-26 Duplex Switchback Assembly Description
 Description
 LaserJet 5/5M/5N Printer
 Table B-1
Product Information
 HP LJ4M+ HPLJ5 HPLJ5M HPLJ5N
 LaserJet 4? LaserJet 4 Plus? LaserJet 5?
Table B-2
 LaserJet 5/5M/5N Printer B-5
 Table B-4
Table B-3Printer Dimensions
HP LaserJet 5 / 5M / 5N
 Table B-5
Table B-6
 HP LaserJet 5/5M/5N Part Number Documents-Description
Table B-7
 Laser Statement Sweden/Finland
 Control Panel Keys
Control Panel Layout
 Printer back on line
Table B-8 Control Panel Keys Explanation
 Value +
Key Explanation
 To change a control panel setting
 Figure B-3 Control Panel Menu Map
 TableB-10 Printing Menu Items
Printing Menu
 Media size
 Table B-11 PCL Fonts Menu Items
PCL Fonts Menu
 Table B-13 Job Menu Items
PostScript Menu
Job Menu
Table B-12 PostScript Menu Items
 Table B-14 Configuration Menu Items
Configuration Menu
 Auto OFF
 Table B-15 Memory Configuration Menu Items
Memory Configuration Menu
 Table B-17 Serial Menu Items
Serial Menu
Table B-16 Parallel Menu Items
 Table B-18 Resets Menu Items
Resets Menu
 Table B-19 Test Menu Items
Test Menu
 LaserJet 5/5M/5N Printer B-25
 Service Mode
 Setting the Cold Reset Default
 Big Data
Diagnostics
Skip Demo
 Programming a Flash Simm
 Changing the Control Panel Display Language
 Nvram Init
 Table B-20 Self Test Printout Items for the HP LaserJet
 Figure B-4 HP LaserJet 5 PCL Self Test Printout
 Infrared Communication
 System Requirements
Figure B-5 IR Data Flow
 Figure B-6 IrDA Port Location
To Print Using the Infrared Port
 Figure B-7 IrDa Port Ranges
 Troubleshooting IR Printing Problems
 Figure B-8 Infrared Test Tool
Page
 Infrared Port Not Responding
Table B-21 Solutions for Infrared Not Responding Situation
 Situation Solution
 Index-1
Index
 Index-2
 Index-3
 Index-4
 Index-5
 Index-6
 Index-7
 Index-8
 SN-1 Service Notes
 SN-2 Service Notes
 SN-3 Service Notes
 SN-4 Service Notes
 SN-5 Service Notes
 SN-6 Service Notes
 SN-7 Service Notes
 SN-8 Service Notes
 C3916-90984