LaserJet 4050 Printer
Service Manual

LaserJet 4050 Printer<br> Service Manual
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LaserJet 4050 Printer Service Manual

This manual contains the necessary information to service the HP LaserJet 4050 Pinter


1 Printer Description
Printer Features
Model and Serial Numbers
Site Requirements
Space Requirements
Environmental Requirements
Paper Specifications
Supported Types of Paper
Guidelines for Using Paper
Card Stock and Heavy Paper
Safety Information
Laser Safety Statement
Canadian DOC Regulations
FCC Regulations
Laser Statement for Finland
Toner Safety
Environmental Product Stewardship

2 Service Approach
Service Approach
Parts and Supplies
Ordering Information
Helpful Documentation
Phone Numbers for Ordering
Exchange Program
World Wide Web
HP Service Parts Information Compact Disc
HP Support Assistant Compact Disc
Toner Cartridge Information
Warranty Statement

3 Printer Operation
Using the Control Panel
Control Panel Layout
Control Panel Lights
Control Panel Keys
Settings and Defaults
Control Panel Menus
Quick Copy Jobs Menu
Private/Stored Jobs Menu
Information Menu
Paper Handling Menu
Print Quality Menu
Printing Menu
Configuration Menu
I/O Menu
EIO Menu (Networked Printers)
Resets Menu
Service Mode
Service Menu
Setting the Page Count, Maintenance Count, and
Serial Number
Cold Reset Paper
Clear Event Log
Testing the Printer
Resetting the Printer
System Configuration
MS-DOS System Configuration
Parallel DOS Commands
Serial MS-DOS Commands
Printer I/O Configuration
Parallel Menu
Serial Configuration

4 Printer Maintenance
Cleaning the Printer and Accessories
Cleaning Spilled Toner
Preventative Maintenance
Reset Maintenance Count
Expected Life of Components

5 Functional Information
Power Supply System
AC/DC Power Distribution
Overcurrent Overvoltage Protection
High-voltage Power Distribution
Toner Cartridge Detection
Engine Controller System
Engine Controller Board Inputs and Outputs
Laser and Scanner Drive
Paper Motion Monitoring and Control
Solenoids, Sensors, Clutches, and Switches
Engine Test Print
Formatter System
Resolution Enhancement technology (REt)
Printer Memory
Random Access Memory (RAM)
DIMM Slots
Page Protect
PJL Overview
Control Panel
Image Formation System
Toner Cartridge
Photosensitive Drum
Writing the Image
Developing the Image
Transferring the Image
Image Fusing/Variable Fusing Temperature
Paper Feed System
Clutches and Sensors
Printing from Tray 1
Printing from Tray 2
Printing from the Optional 500-sheet
Universal Tray
Envelope Feeder
Paper Jam
Basic Sequence of Operation

6 Removing and Replacing Parts
Removal and Replacement Strategy
Removing Covers
Rear Right Side Cover
Top Cover
Left Side Cover
Front Right Side Cover
Rear Cover/Rear Output Bin
Tray 1
Removing Assemblies
Formatter Cage Assembly
Output Assembly
Laser Scanner
Main Motor
Transfer Roller
Tray 1 Pickup Roller
Tray 1 Pickup Assembly
Right Side Toner Cartridge Guide
Registration Assembly
Paper Feed Assembly
Formatter Pan
Gear Train
Delivery Drive Assembly
Separating the Engine Module from the Paper Feed Module 2
Engine Controller Board
Paper Feed Rollers
Separation Rollers
Paper Feed Module Plate
Paper Feed Module Gear Train Assembly
Paper Feed Module Side Rails
Lower Paper Feed Module Plate (HP LaserJet 4000 T/4000 TN
and 4050 T/4050 TN)
PCA Cover (HP LaserJet 4000 T/4000 TN and
4050 T/4050 TN)
PCA Cover (HP LaserJet 4000/4000 N and 4050/4050 N) 55
PCA Controller

7 Troubleshooting
Troubleshooting Process
Troubleshooting Flowchart
Troubleshooting Flowchart (Continued)
Troubleshooting the Printing System
Preliminary Operating Checks
Power On
Engine Test
Event Log
Printer Messages
General Paper Path Troubleshooting
Information Pages
Image Quality
Image System Troubleshooting
Interface Troubleshooting
AUTOEXEC.BAT Standard Configurations
Reference Diagrams
Locations of Components
Paper Path
Engine Controller Board
Paper Size Detection Switches
Sensors and Thermistor
Solenoids and Clutch

8 Parts and Diagrams
How To Use the Parts Lists and Diagrams
Accessories and Supplies
Common Screws and Replacement Cables
Illustrations and Parts Lists
Alphabetical Parts List
Numerical Parts List

FORMAT: High resolution PDF document!
ZIP archive: 3 843 kB

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We are in business since 2002 and do our best to give our customers perfect service!

  Christopher Kennel 2011-12-06 21:27:38  
  EPSON Artisan 800 - 2manuals Reset tool for the Waste Ink Counter works like a charm... Best $9.99 I've spent in some time! 12,000 Pages printed (large jobs) and my ink pad was barely used... EPSON get a clue, many thanks 2manuals for having the foresight to correct their lunacy...
  Park Chan Yong 2007-11-16 06:30:19  
  Jakov Frumin 2009-01-05 22:37:02  
  Paul Inouye 2016-12-16 20:41:53  
  Thanks for the program and manual. I was able to revive a 2 year old 4900. I had 100% blockage in 8 of the 11 heads, and over 50% blockage in the last three.... I ran the ink charge with cleaning fluid. Now I have 100% of the nozzle check pattern on ALL of the heads. I was blown away. I thought for sure I was going to pay for a new head. So, thank you. I also have a an older Epson Stylus Pro 4000. It has been sitting a while and the heads are dried up. Do you have the same program and manual for this printer? I would like to try to revive it as well. If you do could you just send me a link? Thanks again
  goran kocevski 2009-02-28 15:23:56  
  It is easy and good manual. thank you!
  ali khalaf 2018-04-04 17:10:19  
  LIFE SAVER! This program help me solve all the problem for my printer. I Love all of you developers!
  Yıldırım Oran 2006-09-01 11:50:06  
  Thank you!
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