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HP Laserjet 4L, 4ML, 4P,  4MP laser printer service guide Preview image 1
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HP Laserjet 4L, 4ML, 4P, 4MP laser printer service guide

Models covered in this manual:

Laserjet 4L, 4ML, 4P, 4MP / HP Hewlett-Packard's

File specifications

File size: 11.07 MB
File type: PDF
Language: English
Number of pages: 306

Printable: Yes
Estimated download time: 0.23 Minutes
$4.99 Instant Download

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Product Information

Table of Contents

GENERAL INFORMATION

  1. Sample Model and Serial Number Labels

ASSEMBLY LOCATIONS

  1. External Assembly Locations (LaserJet 4L/4ML)
  2. External Assembly Locations (LaserJet 4P/4MP)
  3. Internal Assembly Locations (all printers)
  4. LaserJet 4L Internal Assembly Locations
  5. LaserJet 4P Internal Assembly Locations

INSTALLATION

  1. Printer Space Requirements
  2. Distributing Toner
  3. Attaching the Help Label (LaserJet 4L/4ML)
  4. LaserJet 4L/4ML Front Control Panel
  5. LaserJet 4P/4MP Front Control Panel

SERVICE

  1. Service Approach
  2. Removing Metal Side/Sheet-Feed Pages
  3. LaserJet 4L/4ML Removing Side Covers
  4. LaserJet 4P/4MP Removing Side Covers
  5. Paper Feed Area
  6. Clearing Paper Jams from the Cassette Area
  7. Clearing Jams from the Paper Output Area
  8. Clearing Jams from the Fuser Area
  9. Printer Toner Cartridge
  10. Control Panel
  11. Top Cover
  12. Printer Registration Assembly
  13. High-Voltage Power Supply
  14. Engine Controller Board
  15. DC Power Supply Board
  16. Formatter Board
  17. Fuser Assembly
  18. Transfer Roller
  19. Printer Engine Test
  20. Drum Drive Motor
  21. Solenoids
  22. Gears and Belts
  23. Paper Pickup Roller
  24. Printer Paper Path
  25. Main Drive Assembly

ELECTRICAL SYSTEM

  1. Low-Voltage Power Supply
  2. High-Voltage Power Supply
  3. DC Controller Board
  4. AC Power Distribution

MECHANICAL SYSTEM

  1. Paper Pickup Assembly
  2. Paper Feed Roller
  3. Transfer Roller
  4. Fuser Assembly
  5. Paper Delivery Assembly
  6. Printer Feed and Delivery System

MAINTENANCE

  1. Routine Maintenance
  2. Cleaning
  3. Lubrication

TROUBLESHOOTING

  1. Error Codes
  2. Diagnostics and Test Printouts
  3. Common Problems and Solutions

APPENDIX

  1. Parts List
  2. Schematic Diagrams
  3. Index

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