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