HP LaserJet 4000 Series Printers
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HP LaserJet 4000 and 4050 Series Printers
Copyright Hewlett-Packard Company
Contents
Contents-2
Printer Operation
Contents-3
Functional Information
Removing and Replacing Parts
Contents-4
Troubleshooting
Contents-5
Contents-6
Printer Description
Overview
Printer Features
Printer Features for the HP LaserJet 4000 Series Printer
Sheet Tray
Printer Features for the HP LaserJet 4050 Series Printer
Speed
Sheet Tray 2 HP LaserJet 4050/ 4050 N
6Printer Description
LocalTalk 10/100 Base TX
Identification
Model and Serial Numbers
Site Requirements
Printer Weight without Toner Cartridge
Space Requirements
Acoustic Emissions Per ISO Printer State Sound Power
Environmental Requirements
Paper Specifications
Envelopes
Legal By 14
14Printer Description
Supported Types of Paper
Maximum Size By 10 178 by 254 mm
Guidelines for Using Paper
Cutouts or perforations
Such as those used in some types of thermography
Paper Weight Equivalence Table
15. Paper Weight Equivalence
Labels
Transparencies
Label Construction
Envelopes
Envelope Construction
Envelopes with Double Side Seams
Envelopes with Adhesive Strips or Flaps
Envelope Margins
Envelope Storage
16. Envelope Margins Type of Address Top Margin Left Margin
Card Stock and Heavy Paper
Card Stock Construction
Card Stock Guidelines
Safety Information
Laser Safety Statement
Canadian DOC Regulations
FCC Regulations
Laser Statement for Finland
Laserturvallisuus Luokan 1 Laserlaite Klass 1 Laser Apparat
Toner Safety
Printer design eliminates
Environmental Product Stewardship
Protecting the Environment
Printer design reduces
Service Approach
Service Approach
Parts and Supplies
Ordering Information
Helpful Documentation
Helpful Documentation Description or Use
Helpful Documentation Description or Use Part Number
Exchange Program
HP Service Parts Information Compact Disc
Phone Numbers for Ordering
Consumables
HP Support Assistant Compact Disc
North and Latin America
Asia/Pacific
Customer Care Reseller Sales and Service Support Center
Europe, Middle East, and Africa
Other Areas
Toner Cartridge Information
Refilled Toner Cartridges
Recycling Toner Cartridges
Warranty Statement
Printer Operation
Control Panel Lights
Using the Control Panel
Control Panel Layout
Ready
Control Panel Keys
Paper Size
Control Panel Keys Function
Settings and Defaults
Settings and Defaults
Setting the display language
Setting or Default Explanation
To change a Control Panel setting
Control Panel Menus
To print a Control Panel menu map
Quick Copy Jobs Menu
Quick Copy Jobs Menu
Private/Stored Jobs Menu
Private/Stored Jobs Menu
Information Menu
Print Menu MAP
Information Menu ItemExplanation
SIZE=COM10
Paper Handling Menu
Envelope Feeder
TYPE=PLAIN
Tray 2 TYPE=
Tray 1 TYPE=
Plain
Tray 3 TYPE=
TYPE=NORMAL Normallow High
Configure Fuser Mode MENU=NO
Override A4 LETTER=NO
ROUGH=HIGH
Fastres
RESOLUTION=
Print Quality Menu
Print Quality Menu Values
RET=MEDIUM OFF Light
Dark
ECONOMODE=OFF
Cleaning
Toner DENSITY=3 Create
Process
Printing Menu
Unit of MEASURE= Inches
Inches Millimeters Configure Custom
DIMENSION=
FORM=
PCL Font Internal SOURCE=INTERNAL Soft
PCL Font NUMBER=0
Printing Menu Values
COURIER=REGULAR Regular Dark
PCL Symbol
SET=PC-8
Wide A4=NO
Print PS ERRORS=OFF
Append CR to LF=
Configuration Menu
Resource SAVE=
10. Configuration Menu ItemValues
PROTECT=
Clearable JOB Auto CONTINUE=
RAM DISK=OFF RAM Disk SIZE=XXXK Continue Stop Auto
Auto OFF
JAM RECOVERY=
Maintenance OFF MESSAGE=OFF Small Paper
SPEED=NORMAL Slow
Quick Copy
Timeout = OFF
Configure YES Prores 1200=NO
Held JOB
BUFFER=AUTO Auto
TIMEOUT=15
Menu
Buffer SIZE=
Parallel ADV FUNCTIONS=ON
Parallel High
SPEED=YES
SERIALDTR/DSR PACING=DTR/DSR XON/XOFF
Serial DTR
Serial Robust
Serial Baud
POLARITY=HIGH
EIO Menu Networked Printers
CFG TCP/IP=NO
CFG ETALK=NO
Resets Menu
Accessory. HP LaserJet 4050 series printer only
13. Resets Menu
Service Mode
To enter Service Mode
Service Menu
Setting the Page Count, Maintenance Count
Serial Number
Menu
Count
Mode
14. Changing the Page Count Key Press Display Description
Maintenance Page Count
PAGES=0
Clear Event Log
Cold Reset Paper
Diagnostics
Serial Number
Testing the Printer
Engine Test
To perform a Cold Reset
Resetting the Printer
Cold Reset
Clearing Nvram
System Configuration
MS-DOS System Configuration
Parallel DOS Commands
Serial MS-DOS Commands
Printer I/O Configuration
Serial Configuration
Parallel Menu
Pacing Handshaking
Printer Maintenance
Cleaning the Printer and Accessories
Cleaning the Printer Component Cleaning Method / Notes
Inside General
Cleaning Spilled Toner
Using the Printer Cleaning
Preventative Maintenance
Reset Maintenance Count
Expected Life of Components
Functional Information
Power Supply System
AC/DC Power Distribution
Overcurrent Overvoltage Protection
High-voltage Power Distribution
Toner Cartridge Detection
Engine Controller System
3Engine Controller Board Engine Controller System
Engine Controller Board Inputs and Outputs
4Engine Controller Board I/O 1 8Functional Information
5Engine Controller Board I/O 2 Engine Controller System
6Engine Controller Board I/O 3 10Functional Information
7Engine Controller Board I/O 4 Engine Controller System
Paper Motion Monitoring and Control
Solenoids, Sensors, Clutches, and Switches
Laser and Scanner Drive
Engine Test Print
Motors
Page
PowerSave
Formatter System
Resolution Enhancement technology REt
EconoMode
Expanded I/O
Input/Output
Parallel Interface
HP Fast InfraRed Receiver
Local Talk I/O
Printer Memory
Disk
Read Only Memory ROM
Non-Volatile Memory Nvram
Random Access Memory RAM
Dimm Slots
Memory Enhancement technology MEt
Protect
PJL Overview
PML
Control Panel
Image Formation System
Page
Toner Cartridge
Toner Cartridge
Photosensitive Drum
11Photosensitive Drum Image Formation System
Cleaning the Drum
12Cleaning the Drum 26Functional Information
Conditioning the Drum
13Primary Charging Roller Image Formation System
Writing the Image
Developing the Image
Transferring the Image
16Transferring the Image 30Functional Information
Image Fusing/Variable Fusing Temperature
Variable Fusing Temperature
Paper Feed System
19Paper Feed Subsystem Paper Feed System
Paper Path
Clutches and Sensors
Printing from Tray
21Tray 1 Pickup Timing 36Functional Information
Tray 1 Pickup
23Tray 2 Pickup Timing 38Functional Information
Tray 2 Pickup
Multi-Feed Prevention Mechanism
25Multi-Feed Prevention Mechanism 40Functional Information
Printing from the Optional 500-sheet Universal Tray
26Paper Feeder Driver I/O Paper Feed System
Pickup and Feeding
28Paper Feed Pickup Paper Feed System
Envelope Feeder
Envelope Feed
30Envelope Feed Pickup Paper Feed System
Duplexer
Reversing and Duplexer Pickup
31Paper Path for the Duplexer Paper Feed System
Paper Jam
32Paper Feed for the Duplexer
Basic Sequence of Operation
Printer Timing Period Purpose
Timing Diagram
Removing and Replacing Parts
Removal and Replacement Strategy
Tools
Screws Used in the Printer
Screws Used in the Printer Drawing and Description Purpose
Hint
Removing Covers
Rear Right Side Cover
Top Cover
Control Panel Overlay
Control Panel
Toner Cartridge Drive Arm
Toner cartridge drive arm Rear screws Top screws
Release tab if necessary
Left Side Cover
Catches
Front Right Side Cover
Rear Cover/Rear Output Bin
Tray
Page
Detail of the Tray 1 Sensor Arm Cover
Removing Assemblies
Fuser
Page
Formatter Cage Assembly
Output Assembly
Page
Laser Scanner
Fan
Main Motor
Transfer Roller
Tray 1 Pickup Roller
Page
Tray 1 Pickup Assembly
Envelope feeder connector cover
Page
Step
Toner cartridge guide
Right Side Toner Cartridge Guide
Registration Assembly
Do not Remove
Paper Feed Assembly
Removing the upper screws from the Paper Feed Assembly
By inserting it into the slot, as shown
Formatter Pan
Gear Train
Delivery Drive Assembly
Separating the Engine Module from the Paper Feed Module
Page
Back, not on the board Spring Power switch rod
Engine Controller Board
Rod
Adjusting the Top Margin
Measure this distance
Paper Feed Rollers
Separation Rollers
Paper Feed Module Plate
Paper Feed Module Gear Train Assembly
Paper Feed Module Side Rails
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PCA Cover HP LaserJet 4000 T/4000 TN and 4050 T/4050 TN
PCA Cover HP LaserJet 4000/4000 N and 4050/4050 N
PCA Controller
Troubleshooting
Troubleshooting Process
Major Steps for Troubleshooting
Major Steps for Troubleshooting
Troubleshooting Flowchart
1Troubleshooting Flowchart 1 4Troubleshooting
Troubleshooting Flowchart Troubleshooting Process
Troubleshooting the Printing System
Preliminary Operating Checks
Power On Defect or Blank Display
Power On
Can assist in locating printing errors
Problem Action
Power On Defect or Blank Display ProblemAction
If the Fan is not working
No AC Power Cause Action
Defective AC receptacle or AC power line
No DC Power Cause Action
Engine Test
Location of Engine Test Button
Display
Printing an Engine Test
Event Log
Most recent error up to
Display the Event Log
Print the Event Log
Interpret the Event Log
Shows a typical Event Log. The Event Log shows
Printer Messages
Cannot Duplex Rear BIN Open Check Input Device
BAD Duplexer
Connection
Message Action
Disk Device Failure
Disk File
System is Full
Disk is Write Protected
Not Functional
Flash File System is Full
Install Tray
Flash is Write Protected
Do not Power OFF
Loading Program Number
Perform Printer Maintenance
Offline
RAM Disk Device Failure
RAM Disk File Operation Failed
Tray X Empty
Tray X Load Type Size
One of the following occurred
Feeder Installed
Unsupported Size in Tray YY USE Type Size INSTEAD?
Wrong Envelope
XX Paper JAM Location
For 13.20
Insufficient Memory
Press GO to Continue
Parallel I/O Buffer Overflow
Press GO to Continue Serial I/O Buffer Overflow
BAD Serial Transmission
Printer Error
Fuser Error
4Fuser connectors Troubleshooting the Printing System
36Troubleshooting
53.XY.ZZ
38Troubleshooting
62.X
69.X
Xxxx Printer Error
8X.YYYY
Disk volume not present it may be uninitialized
Disk Error Error Description Solution Number
Directories has been reached
General Paper Path Troubleshooting
Page
Paper Path Test
Press Item until Print Paper Path Test appears
Information Pages
Menu Map
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6Sample Menu Map 4050 series printer 50Troubleshooting
Configuration
Printer Information
Installed Paper Personalities
Verify Installed Options
Image Quality
Image Quality Checks Image Quality Checks Action
Check the Toner Cartridge
EconoMode
Image Defects
High-voltage power supply connections are contaminated
11. Black Possible Cause Action
12. Blank Possible Cause Action
Voltage
13. Blank Spots
Possible Cause Action
14. Creases Possible Cause Action
Check the paper or other print media type
15. Curl Possible Cause Action
For paper type
16. Contamination on Back Possible Cause Action
17. Distorted Image
18. Dropouts Possible Cause Action
19. Faded Print/Bubbles Possible Cause Action
20. Gray Background Possible Cause Action
21. Horizontal Black Lines Possible Cause Action
22. Horizontal Smudges Possible Cause Action
23. Horizontal White Lines Possible Cause Action
24. Light Print, Dark Print, or Fade Possible Cause Action
25. Loose Toner Possible Cause Action
26. Repetitive Defects
27. Skew Possible Cause Action
28. Toner Smear Possible Cause Action
Paper SPEED=SLOW
29. Toner Specks Possible Cause Action
30. Vertical Black Lines
31. Vertical Dots
32. Vertical White Lines
9Repetitive Defect Ruler Troubleshooting the Printing System
Repetitive Defect Ruler
Image System Troubleshooting
Half Self Test Functional Check
Drum Rotation Functional Check
High-voltage Power Supply Functional Check
33. High Voltage System Checks Action
Communications Check
Interface Troubleshooting
EIO Troubleshooting
Test Message
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Page
HP JetDirect Configuration
AUTOEXEC.BAT Standard Configurations
Parallel DOS Commands
Serial DOS Commands
Communications Checks
34. Communications Checks ChecksAction
For Serial Communications Only
34. Communications Checks ChecksAction
Reference Diagrams
Locations of Components
35. Components in Figure
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13Components of the Duplexer Reference Diagrams
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15Components of the Envelope Feeder Reference Diagrams
17Paper Path with the Duplexer 90Troubleshooting
Paper Path
18Paper Path with the Envelope Feeder Reference Diagrams
36. Paper Sensors in Figure
37. Engine Controller Board Layout
SW1
Paper Size Detection Switches
OFF
24Location of Motors
39. Motors in Figure
Connectors
25Connectors 1 Reference Diagrams
26Connectors 2 98Troubleshooting
Page
28Location of PCAs 100Troubleshooting
PCAs
40. Location of PCAs
29Location of Sensors and Thermistor 1 102Troubleshooting
Sensors and Thermistor
30Location of Sensors and Thermistor 2
41. Sensors and Thermistor in -29 and Figure
104Troubleshooting
31Location of Solenoids and Clutch 1 Reference Diagrams
Solenoids and Clutch
32Location of Solenoids and Clutch 2 106Troubleshooting
42. Solenoids and Clutch in -31 and Figure
Switches
33Location of Switches 108Troubleshooting
43. Switches in Figure
Timing
34Pickup Timing for Tray 2 and lower trays
Parts and Diagrams
How To Use the Parts Lists and Diagrams
Ordering Parts
Ordering Consumables
Replacement parts and cannot be ordered
Accessories and Supplies
Accessories and Supplies Description Exchange No Product No
Accessories and Supplies Description Exchange No. Product No
Common Screws and Replacement Cables
Screws Used in the Printer Description
Replaceable Cables Description Table No Item No
Illustrations and Parts Lists
1Assembly Location Diagram 8Parts and Diagrams
Formatter C4251-69001 4050 only
2External Covers and Panels 10Parts and Diagrams
Illustrations and Parts Lists
3Top Cover Assembly 12Parts and Diagrams
Top Cover Assembly Item No Quantity Description
1211
Internal Components 1 Item No. Part No Quantity Description
13 12 227
Internal Components 2 Item No Quantity Description
18Parts and Diagrams
Illustrations and Parts Lists
6Internal Components 3 20Parts and Diagrams
Internal Components 3 Item No Quantity Description
7Engine Controller Board Assembly 22Parts and Diagrams
Illustrations and Parts Lists
8Delivery Drive Assembly
11. Delivery Drive Assembly Item No Quantity Description
9Printer Drive Assembly
12. Printer Drive Assembly Item No Quantity Description
10Tray 1 Pickup Assembly 26Parts and Diagrams
13. Tray 1 Pickup Assembly Item No Quantity Description
11Tray 1 Assembly
14. Tray 1 Assembly Item No Quantity Description
12Paper Feed Assembly
15. Paper Feed Assembly Item No Quantity Description
13Registration Assembly
16. Registration Assembly Item No Quantity Description
17. Paper Feed Guide Assembly Item No Quantity Description
15Delivery Assembly 32Parts and Diagrams
18. Delivery Assembly Item No Quantity Description
16Fuser Assembly 1
17Fuser Assembly 2
614
Connector 250- and 500-sheet Feeder
Paper Pickup Drive Assembly
22. Paper Pickup Drive Assembly Item No Quantity Description
Sheet Tray
23 -sheet Tray Item No Quantity Description
Page
Illustrations and Parts Lists
Page
Connector 250- and 500-sheet Feeder
23Upper Paper Pickup Drive Assembly
24Lower Paper Pickup Drive Assembly
48Parts and Diagrams
28 -sheet Tray Item No Quantity Description
Page
XD2-1100-502CN Ring, E RG5-2690-000CN
Page
Illustrations and Parts Lists
28Envelope Feeder 54Parts and Diagrams
31. Envelope Feeder Item No Exchange No Quantity Description
29Internal Components of Duplexer 56Parts and Diagrams
Illustrations and Parts Lists
Alphabetical Parts List
RB1-8907-000CN 25 on Tray
60Parts and Diagrams
Mrom
62Parts and Diagrams
Illustrations and Parts Lists
64Parts and Diagrams
Toner Cartridge 6,000 Pages
66Parts and Diagrams
Numerical Parts List
68Parts and Diagrams
Illustrations and Parts Lists
70Parts and Diagrams
Mounting Assembly Separation
72Parts and Diagrams
Illustrations and Parts Lists
74Parts and Diagrams
Index
Index-1
Index-2
Index-3
Index-4
Wiring Diagram HP LaserJet 4000/4000N
Wiring Diagram HP LaserJet 4000 T/4000TN
Page
C4251-91003