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HP LaserJet 4000 4050

Tags : HPLaserJet400040504050TN4050N4050T4000TN4000N4000TC4251-91003 
HP LaserJet 4000 4050 Manuel de service

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Description

HP LaserJet 4000 4050 Service Manual
Publication number C4251-91003
First edition, April 1999
HP LaserJet 4000
HP LaserJet 4000T
HP LaserJet 4000N
HP LaserJet 4000TN
HP LaserJet 4050
HP LaserJet 4050T
HP LaserJet 4050N
HP LaserJet 4050TN

Contents
1 Printer Description
Overview 1-1
Printer Features . 1-2
Identification 1-8
Model and Serial Numbers . 1-8
Site Requirements . 1-9
Space Requirements . 1-10
Environmental Requirements 1-11
Paper Specifications. 1-12
Supported Types of Paper. 1-15
Guidelines for Using Paper 1-16
Labels 1-19
Transparencies . 1-19
Envelopes . 1-20
Card Stock and Heavy Paper 1-23
Safety Information 1-24
Laser Safety Statement . 1-24
Canadian DOC Regulations . 1-24
FCC Regulations 1-25
Laser Statement for Finland . 1-26
Toner Safety . 1-27
Environmental Product Stewardship . 1-28
2 Service Approach
Overview 2-1
Service Approach2-2
Parts and Supplies . 2-3
Ordering Information 2-3
Helpful Documentation 2-4
Phone Numbers for Ordering2-6
Exchange Program . 2-6
Consumables2-6
World Wide Web . 2-6
HP Service Parts Information Compact Disc 2-6
HP Support Assistant Compact Disc 2-7
HP FIRST 2-7
Toner Cartridge Information. 2-9
Warranty Statement . 2-10
3 Printer Operation
Overview 3-1
Using the Control Panel . 3-2
Control Panel Layout 3-2
Control Panel Lights. 3-2
Control Panel Keys . 3-3
Settings and Defaults3-4
Control Panel Menus . 3-5
Quick Copy Jobs Menu 3-6
Private/Stored Jobs Menu 3-7
Information Menu . 3-8
Paper Handling Menu . 3-9
Print Quality Menu . 3-12
Printing Menu. 3-15
Configuration Menu 3-20
I/O Menu 3-26
EIO Menu (Networked Printers). 3-29
Resets Menu . 3-31
Service Mode 3-32
Service Menu . 3-33
Setting the Page Count, Maintenance Count, and
Serial Number. 3-33
Cold Reset Paper3-36
Diagnostics 3-36
Clear Event Log . 3-36
Testing the Printer 3-37
Resetting the Printer. 3-38
System Configuration 3-39
MS-DOS System Configuration . 3-39
Parallel DOS Commands3-39
Serial MS-DOS Commands 3-40
Printer I/O Configuration3-41
Parallel Menu . 3-41
Serial Configuration 3-41
4 Printer Maintenance
Overview 4-1
Cleaning the Printer and Accessories 4-2
Cleaning Spilled Toner. 4-4
Preventative Maintenance . 4-5
Reset Maintenance Count 4-5
Expected Life of Components . 4-6
5 Functional Information
Overview 5-1
Power Supply System 5-2
AC/DC Power Distribution 5-2
Overcurrent Overvoltage Protection 5-3
High-voltage Power Distribution . 5-4
Toner Cartridge Detection 5-5
Engine Controller System5-6
Engine Controller Board Inputs and Outputs 5-8
Laser and Scanner Drive 5-12
Paper Motion Monitoring and Control 5-12
Solenoids, Sensors, Clutches, and Switches 5-12
Engine Test Print 5-12
Motors 5-13
Formatter System 5-15
PowerSave 5-15
Resolution Enhancement technology (REt)5-16
EconoMode 5-16
Input/Output 5-17
CPU 5-18
Printer Memory . 5-18
Random Access Memory (RAM) 5-19
DIMM Slots 5-19
Page Protect . 5-20
PJL Overview. 5-20
PML 5-21
Control Panel . 5-21
Image Formation System . 5-22
Toner Cartridge . 5-24
Photosensitive Drum . 5-25
Writing the Image5-28
Developing the Image 5-29
Transferring the Image . 5-30
Image Fusing/Variable Fusing Temperature . 5-31
Paper Feed System . 5-33
Clutches and Sensors 5-35
Printing from Tray 1 5-36
Printing from Tray 2 5-38
Printing from the Optional 500-sheet
Universal Tray 5-41
Envelope Feeder 5-44
Duplexer 5-46
Paper Jam . 5-48
Basic Sequence of Operation5-49
6 Removing and Replacing Parts
Overview 6-1
Removal and Replacement Strategy . 6-2
Tools 6-3
Removing Covers6-6
Rear Right Side Cover . 6-6
Top Cover 6-7
Left Side Cover . 6-12
Front Right Side Cover . 6-13
Rear Cover/Rear Output Bin . 6-14
Tray 1. 6-15
Removing Assemblies . 6-18
Fuser . 6-18
Formatter Cage Assembly . 6-20
Output Assembly 6-21
Laser Scanner 6-23
Fan. 6-24
Main Motor . 6-25
Transfer Roller 6-26
Tray 1 Pickup Roller6-27
Tray 1 Pickup Assembly 6-29
Right Side Toner Cartridge Guide . 6-33
Registration Assembly 6-34
Paper Feed Assembly 6-36
Formatter Pan 6-39
Gear Train . 6-40
Delivery Drive Assembly 6-41
Separating the Engine Module from the Paper Feed Module . 6-42
Engine Controller Board. 6-44
Paper Feed Rollers 6-48
Separation Rollers . 6-49
Paper Feed Module Plate . 6-50
Paper Feed Module Gear Train Assembly. 6-51
Paper Feed Module Side Rails . 6-52
Lower Paper Feed Module Plate (HP LaserJet 4000 T/4000 TN
and 4050 T/4050 TN) . 6-53
PCA Cover (HP LaserJet 4000 T/4000 TN and
4050 T/4050 TN). 6-54
PCA Cover (HP LaserJet 4000/4000 N and 4050/4050 N) 6-55
PCA Controller 6-56
7 Troubleshooting
Overview 7-1
Troubleshooting Process 7-2
Troubleshooting Flowchart . 7-4
Troubleshooting Flowchart (Continued)7-5
Troubleshooting the Printing System . 7-6
Preliminary Operating Checks . 7-6
Power On. 7-7
Engine Test 7-11
Display 7-12
Event Log7-13
Printer Messages7-17
General Paper Path Troubleshooting 7-45
Information Pages . 7-48
Image Quality. 7-54
Image System Troubleshooting . 7-74
Interface Troubleshooting . 7-77
AUTOEXEC.BAT Standard Configurations 7-81
Reference Diagrams 7-84
Locations of Components . 7-84
Paper Path. 7-90
Engine Controller Board 7-93
Paper Size Detection Switches . 7-94
Motors 7-96
Connectors 7-97
PCAs 7-100
Sensors and Thermistor . 7-102
Solenoids and Clutch7-105
Switches . 7-108
Timing . 7-110
8 Parts and Diagrams
Overview 8-1
How To Use the Parts Lists and Diagrams 8-2
Accessories and Supplies . 8-4
Common Screws and Replacement Cables 8-6
Illustrations and Parts Lists 8-8
Alphabetical Parts List 8-58
Numerical Parts List8-67



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