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HP LaserJet 5L HP LaserJet 6L C3941A C3990A
Models:
5L
6L
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Troubleshooting
Specifications
Install
Parts list
Error codes
Image Formation Block Diagram
Connector Signal Name Remarks
Hardware Error There is an
Warranty
Dimension
Page 2
Image 2
Service Manual
HP LaserJet 5L
HP LaserJet 6L
(C3941A)
(C3990A)
Page 1
Page 3
Page 2
Image 2
Page 1
Page 3
Contents
Page
HP LaserJet 5L HP LaserJet 6L C3941A C3990A
Warranty
Conventions
Here are required statements regarding RFI and laser safety
Chapter Descriptions
List of Figures
Figure B-1 Vcci Statement Japan
List of Tables
Viii
Contents
Product Information
Product Information
Features Descriptions
Printer Features
Printer Features
Paper Capacities and Sizes
HP LaserJet 5L Model and Serial Numbers
Identification
Model and Serial
HP LaserJet 6L Model and Serial Numbers
Electrical Specifications
Specifications
Performance Specifications
Acoustic Emissions
Product Overview
Front/Side Views of the Printer
Front Door Assemblies
Back View of the Printer
Ordering Parts
Service Approach
Parts Exchange Program
Ordering Consumables
Related Documentation
Description
Online Services for
Technical Assistance
Worldwide Support
North American Response Center
Warranty
Warranty Exclusions
Products sold within one country to another country
Warranty Limitations
Voltage Conversions
Regulatory requirements
Product Information
Site Requirements
Site Requirements
Operating Environment
Consider the following points before installing the printer
Site Requirements
Environmental Requirements
Printer Space Requirements
Printer Space Requirements Printer Dimensions
Description Dimension
Storing Opened Toner Cartridges
HP C3906A/F Toner Cartridge
Storage Conditions
Toner Cartridge Handling Suggestions
Toner Cartridge Distribution
Operating Overview
Operating Overview
Using the Control Panel
Control Panel Layout
LED Lights
Indicator Lights 1
When this Indicator
It means this Do this
Indicator Lights 2
Hardware Error There is an
Function Lights Action Result
Front Panel Button
Front Panel Button Usage
Printing a Self-Test
Self-test Page for HP LaserJet 5L
To print a self-test
Self-test Page for HP LaserJet 6L
Continuous Self Test
Printer’s rated speed
Printing an Engine Test
Useful for checking and adjusting registration
Refer to Engine Test in for the engine test procedure
Engine Test Button
Resetting the Printer
To Reset the Printer
Operating Overview
Printer Maintenance
Printer Maintenance
Life Expectancy of Consumables
Life Expectancy of Consumables
Toner cartridge box
Toner Cartridge Life
Saving Toner with EconoMode
Five Percent Text Coverage
Recycling Toner Cartridges
Some software applications may refer to this as draft mode
Refilled Toner Cartridges
Information
Cleaning the Printer
Cleaning Printer Components
Cleaning Printer Components
Contaminants on the roller can cause print quality problems
Cleaning Spilled Toner
Stains into fabric
Functional Overview
Functional Overview
Printer Functional Block Diagram
Basic Printer Functions
DC Controller/Power System
DC Controller Loads
Print Engine Control System
Laser and Scanner Drive
Power System on DC Controller PCA
T e
Functional Overview
Resolution Enhancement REt
Control Panel
Memory Enhancement technology MEt
EconoMode vs Normal Mode
EconoMode
Functional Overview 5
Image Formation Block Diagram
Image Formation System
Drum Conditioning
Drum Cleaning
Toner Cartridge
Image Writing
Image Transferring
Image Fusing
Image Developing
Paper Feed System
Simplified Paper Path
Solenoid and Sensors Solenoid and Photosensors
Name Description
Paper Jam Detection
Printer Timing
Refer to Timing Diagram on the next
Basic Sequence of Operation
Period Timing Purpose
General Timing Diagram HP LaserJet 5L
General Timing Diagram HP LaserJet 6L
Functional Overview
Removal and Replacement
Removal and Replacement
Removal and Replacement Strategy
Removal and Replacement
Installing Memory Cards Dram
MByte card MByte total
Back Cover
Ease of replacement
Covers and Doors
Remove the 3 screws -2, callout
Make certain the Input Extender is up
Back Cover Removal 2
EP Door Assembly
EP Door Assembly Removal
Memory Door
Memory Door Removal
Remove the toner cartridge Remove memory door
Main Cover and Paper Input Assembly
Main Cover and Paper Input Assembly Removal
Without removing the memory door
Internal Assemblies
Control Panel Removal
Exit Roller Assembly
Exit Roller Removal
Delivery Assembly
Delivery Assembly Removal 1
Delivery Assembly Removal 2
Fuser Pressure Plate
Fuser Pressure Plate Removal
Fuser Pressure Plate Replacement
Heating Element
Heating Element Removal 1
Heating Element Removal 2
Heating Element Removal 3
Make sure the connectors are properly reattached
Lift the Heating Element out
Pressure Roller Guide Removal
Pressure Roller
On the right side of the shaft. Refer to for a part number
Unchanged. -17 shows the lever from an HP LaserJet 5L
Face-Up/Face-Down Lever Replacement
Face-Up/Face-Down Lever
Release mechanism
Fuser Exit Roller Removal
Fuser Exit Roller Assembly
Shows the white tab from an HP LaserJet 5L
Paper Exit Sensor Flag
Reinstalled to exactly this position
Paper Exit Sensor Flag Replacement
Top Assemblies
Laser/Scanner Assembly
Laser/Scanner Assembly Removal
Solenoid
Solenoid Removal 1
Only one way
Solenoid Removal 2
Pickup Roller Assembly
Pickup Roller Assembly Removal 1
Pickup Roller Assembly Removal 2
Assembly Figure
Paper Pickup Roller Assembly Replacement Inside/Front View
Paper Feed Frame
Paper Feed Frame Removal 1
Paper Feed Frame Removal 2
Paper Feed Frame Removal 3
Release the sensor unit connector Figure
Paper Feed Frame Removal 4
Transfer Roller Guide & Transfer Roller
Kick Plate
Kick Plate Removal
Kick Plate Spring Replacement
Separation Pad
Separation Pad Removal
Place your index finger on the subpad
Subpads
At the same time
Press toward the top of the printer
Feed Assembly
Feed Assembly Removal 1
Remove the Feed Assembly
Feed Assembly Removal 2
Feed Assembly Removal 3
Memory Door Guide Removal
Bottom Assemblies
Memory Door Guide
Motor
Motor Removal
DC Controller
DC Controller Removal 1
ESD Sensitive
DC Controller Removal 2
DC Controller Removal 3
Formatter Board Removal
Formatter PCA
Correct pieces should you need to replace them
Removal and Replacement
Troubleshooting
Troubleshooting
General Troubleshooting Flowchart
Start
Exit
Paper Path and Components
Paper Path and Components
DC Controller Diagram
∙ Status Messages ∙ Service and Error Messages
Printer Error Troubleshooting
Priority of Errors
Persists
LEDs Description Recommended Action
Printer Status Messages
Printer Status Messages 1
Printer Status Messages 2
Happens, troubleshoot using -3 below
Unclearable Error
Service and Error Messages
Service and Error Messages 1
Beam Error. There are a number of causes
Service and Error Messages 3
Formatter Error
Oz grams
Image Formation Troubleshooting
Check the Toner Cartridge
Image Defect Examples
∙ Replace the DC Controller
Vertical Lines
Character Voids
∙ Your paper may not meet the requirements for the printer
Dropouts
∙ Replace the DC Controller Troubleshooting
Is completely blank. If you get occasional blank pages
White Horizontal Line
Distorted Image or BD Failure
Engine Test
Troubleshooting Checks
Engine Test
Troubleshooting
Drum Rotation Functional Check
Toner Cartridge High Voltage Connection Points 1
High-Voltage Power Supply Check
High-Voltage Power Supply Check
Checks Action
Toner Cartridge High Voltage Connection Points 2
Possible Cause Recommended Action
Paper Curl Troubleshooting
Paper Curl
Remove the Printer Covers Figures 6-2, 6-3,
Troubleshooting Tools
Paper Path Check
Overriding PS204 and SW101
Repetitive Image Defect Ruler
Repetitive Image Defect Ruler
Main Wiring Diagram
Troubleshooting
Connector Signal Name Remarks
Cable Pinouts
Frsth
Troubleshooting
Parts and Diagrams
Parts and Diagrams
How to Use the Part Lists and Diagrams
Parts and cannot be ordered through SMO
Product Number Description
Accessories and Supplies
Accessories and Supplies
Common Hardware
Example Description
Major Assembly Locations
Covers and Doors
Qty Description
Internal Components 1
LaserJet 5L Part No
Internal Components 2
LaserJet 5LPart No
Internal Components 3
Parts and Diagrams
DC Controller/Formatter and Cables
DC Controller Case
Pickup Roller Assembly
Parts and Diagrams
Feed Assembly
Parts and Diagrams
Separation Guide Assembly
Parts and Diagrams
Delivery Assembly
Parts and Diagrams
Parts and Diagrams
Parts Index
Parts Index A-1
Parts Index
Alphabetical Parts List
Parts Index
Parts Index A-3
Index
Parts Index
Parts Index A-5
501/502
Parts Index A-7
Numerical Parts Index
Numerical Parts List
Parts Index A-9
Parts Index
Parts Index A-11
Parts Index
Laser Safety U.S.A
Regulatory Information
Laser Statement Finland
Regulatory Information
Regulatory Information B-3
Toner Safety
Ozone Emission
FCC Statement Class B
Figure B-1
C3941A-01
Service Notes C-1
Fuser Accordian Jams
Service Notes
Solution
C3941A-02A
Service Notes C-3
Fuser Jam Clearing Countermeasure
Service Notes
Index
Index-1
Index-2
Safety
Index-3
Index-4
C3990-90991
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