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Make/Model Information:

  • Brand:   Hewlett-packard
  • Models included:
    • Hp LaserJet 5L (C3941A)
    • Hp LaserJet 6L (C3990A)

File Information:

  • Type:   Factory Service Manual (FSM)
  • Language:   English (EN)
  • Number of pages:   204
  • File size:  ∼ 4.40  MB
  • File Format:   PDF only
  • SME Watermarks:   None
  • Password lock:   No
  • Edit/copy/modify:   Yes
  • SKU:   BMHP-1096

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Printed on
Recycled Paper
*C3990-90991*
*C3990-90991*
C3990-90991
HP LaserJet 5L and 6L Printer
Service Manual
Hewlett Packard Co.
Printed in USA 9/97
Manual Part No.
C3990-90991
HP LaserJet 5L and 6L Printer (C3941/C3990) Service Manual
Chapter Descriptions
1 Product Information
Orientation to the printer, as well as the service and repair philosophy, is discussed.
Information on obtaining assistance and warranty is also here.
2 Site Requirements
Here are recommendations pertaining to installation requirements.
3 Operating Overview
This chapter has detailed information about the Control Panel. Sample self tests and
printer reset information are also included.
4 Maintenance
Turn to this chapter for information about printer cleaning and care.
5 Functional Overview
Here you will find the basic theory-of-operation information required to understand
the various printer systems and how they function together.
6 Removal and Replacement
This chapter contains the step-by-step procedures for replacing printer field
replaceable units (FRUs). Assemblies are grouped by location in the printer.
7 Troubleshooting
Diagnose printer problems here. A preliminary troubleshooting table is followed by
error messages, image defect samples, and diagnostic tools.
8 Parts and Diagrams
Look here to find any field replaceable unit (FRU) in the printer. Exploded view
drawings are accompanied by complete part number tables.
A Parts Index
All parts are sorted and cross-referenced here by part number and name.
B Regulatory Information
Here are required statements regarding RFI and laser safety.
C Service Notes
Service Notes for HP LaserJet 5L concerning paper jams appear here.
Subject Index
Use the subject index to quickly locate any information in the manual.
List of Figures
Figure 1-1 HP LaserJet 5L Model and Serial Numbers . . . . . . . . . . . . 1-4
Figure 1-2 HP LaserJet 6L Model and Serial Numbers . . . . . . . . . . . . . 1-5
Figure 1-3 Front/Side Views of the Printer . . . . . . . . . . . . . . . . . . 1-7
Figure 1-4 Front Door Assemblies . . . . . . . . . . . . . . . . . . . . . . 1-8
Figure 1-5 Back View of the Printer . . . . . . . . . . . . . . . . . . . . . . 1-9
Figure 2-1 Printer Space Requirements . . . . . . . . . . . . . . . . . . . . 2-4
Figure 2-2 Toner Cartridge Distribution . . . . . . . . . . . . . . . . . . . . 2-6
Figure 3-1 Self-test Page for HP LaserJet 5L . . . . . . . . . . . . . . . . . 3-7
Figure 3-2 Self-test Page for HP LaserJet 6L . . . . . . . . . . . . . . . . . 3-8
Figure 3-3 Engine Test Button . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Figure 4-1 Five Percent Text Coverage . . . . . . . . . . . . . . . . . . . . 4-4
Figure 4-2 Static Eliminator Teeth . . . . . . . . . . . . . . . . . . . . . . 4-8
Figure 5-1 Printer Functional Block Diagram . . . . . . . . . . . . . . . . . 5-3
Figure 5-2 DC Controller Loads . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Figure 5-3 EconoMode vs Normal Mode . . . . . . . . . . . . . . . . . . 5-10
Figure 5-4 Image Formation Block Diagram . . . . . . . . . . . . . . . . 5-12
Figure 5-5 Simplified Paper Path . . . . . . . . . . . . . . . . . . . . . . 5-16
Figure 5-6 Solenoid and Sensors . . . . . . . . . . . . . . . . . . . . . . 5-17
Figure 5-7 General Timing Diagram – HP LaserJet 5L . . . . . . . . . . . 5-20
Figure 5-8 General Timing Diagram – HP LaserJet 6L . . . . . . . . . . . 5-21
Figure 6-1 Phillips and Posidriv screwdrivers . . . . . . . . . . . . . . . . . 6-4
Figure 6-2 Back Cover Removal (1 of 2) . . . . . . . . . . . . . . . . . . . 6-6
Figure 6-3 Back Cover Removal (2 of 2) . . . . . . . . . . . . . . . . . . . 6-7
Figure 6-4 EP Door Assembly Removal . . . . . . . . . . . . . . . . . . . 6-8
Figure 6-5 Memory Door Removal . . . . . . . . . . . . . . . . . . . . . . 6-9
Figure 6-6 Main Cover and Paper Input Assembly Removal . . . . . . . . 6-10
Figure 6-7 Control Panel Removal . . . . . . . . . . . . . . . . . . . . . 6-11
Figure 6-8 Exit Roller Removal . . . . . . . . . . . . . . . . . . . . . . . 6-12
Figure 6-9 Delivery Assembly Removal (1 of 2) . . . . . . . . . . . . . . 6-13
Figure 6-10 Delivery Assembly Removal (2 of 2) . . . . . . . . . . . . . . 6-14
Figure 6-11 Fuser Pressure Plate Removal . . . . . . . . . . . . . . . . . . 6-15
Figure 6-12 Fuser Pressure Plate Replacement . . . . . . . . . . . . . . . . 6-16
Figure 6-13 Heating Element Removal (1 of 3) . . . . . . . . . . . . . . . 6-17
Figure 6-14 Heating Element Removal (2 of 3) . . . . . . . . . . . . . . . 6-18
Figure 6-15 Heating Element Removal (3 of 3) . . . . . . . . . . . . . . . 6-19
Figure 6-16 Pressure Roller Removal . . . . . . . . . . . . . . . . . . . . . 6-20
Figure 6-17 Face-Up/Face-Down Lever Replacement . . . . . . . . . . . . 6-21
Figure 6-18 Fuser Exit Roller Removal . . . . . . . . . . . . . . . . . . . 6-22
Figure 6-19 Paper Exit Sensor Flag Replacement . . . . . . . . . . . . . . 6-23
Figure 6-20 Laser/Scanner Assembly Removal . . . . . . . . . . . . . . . 6-24
Figure 6-21 Solenoid Removal (1 of 2) . . . . . . . . . . . . . . . . . . . . 6-25
Figure 6-22 Solenoid Removal (2 of 2) . . . . . . . . . . . . . . . . . . . . 6-26
Figure 6-23 Pickup Roller Assembly Removal (1 of 2) . . . . . . . . . . . 6-27
Figure 6-24 Pickup Roller Assembly Removal (2 of 2) . . . . . . . . . . . 6-28
Figure 6-25 Paper Pickup Roller Assembly Replacement (Inside/Front View) 6-29
Figure 6-26 Paper Feed Frame Removal (1 of 4) . . . . . . . . . . . . . . 6-30
Figure 6-27 Paper Feed Frame Removal (2 of 4) . . . . . . . . . . . . . . 6-31
Figure 6-28 Paper Feed Frame Removal (3 of 4) . . . . . . . . . . . . . . 6-32
Figure 6-29 Paper Feed Frame Removal (4 of 4) . . . . . . . . . . . . . . 6-33
Figure 6-30 Transfer Roller Guide & Transfer Roller Removal
(Inside/Back View) . . . . . . . . . . . . . . . . . . . . . . . 6-34
Figure 6-31 Kick Plate Removal . . . . . . . . . . . . . . . . . . . . . . . 6-35
Figure 6-32 Kick Plate Spring Replacement . . . . . . . . . . . . . . . . . 6-36
Figure 6-33 Separation Pad Removal . . . . . . . . . . . . . . . . . . . . 6-37
Figure 6-34 Subpad Removal . . . . . . . . . . . . . . . . . . . . . . . . . 6-38
Figure 6-35 Feed Assembly Removal (1 of 3) . . . . . . . . . . . . . . . . 6-39
Figure 6-36 Feed Assembly Removal (2 of 3) . . . . . . . . . . . . . . . . 6-40
Figure 6-37 Feed Assembly Removal (3 of 3) . . . . . . . . . . . . . . . . 6-41
Figure 6-38 Memory Door Guide Removal . . . . . . . . . . . . . . . . . 6-42
Figure 6-39 Motor Removal . . . . . . . . . . . . . . . . . . . . . . . . . 6-43
Figure 6-40 DC Controller Removal (1 of 3) . . . . . . . . . . . . . . . . 6-44
Figure 6-41 DC Controller Removal (2 of 3) . . . . . . . . . . . . . . . . 6-45
Figure 6-42 DC Controller Removal (3 of 3) . . . . . . . . . . . . . . . . 6-46
Figure 6-43 Formatter Board Removal . . . . . . . . . . . . . . . . . . . . 6-47
Figure 7-1 Paper Path and Components . . . . . . . . . . . . . . . . . . . . 7-5
Figure 7-2 DC Controller PCA Components . . . . . . . . . . . . . . . . . 7-6
Figure 7-3 Heating Element Resistance Check . . . . . . . . . . . . . . . 7-11
Figure 7-4 Engine Test . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-21
Figure 7-5 Toner Cartridge High Voltage Connection Points (1 of 2) . . . 7-24
Figure 7-6 Toner Cartridge High Voltage Connection Points (2 of 2) . . . 7-25
Figure 7-7 Overriding PS204 and SW101 . . . . . . . . . . . . . . . . . 7-27
Figure 7-8 Repetitive Image Defect Ruler . . . . . . . . . . . . . . . . . 7-28
Figure 7-9 Repetitive Image Defect Ruler . . . . . . . . . . . . . . . . . 7-29
Figure 8-1 Major Assembly Locations . . . . . . . . . . . . . . . . . . . . 8-7
Figure 8-2 Covers and Doors . . . . . . . . . . . . . . . . . . . . . . . . . 8-8
Figure 8-3 Internal Components (1 of 3) . . . . . . . . . . . . . . . . . . 8-10
Figure 8-4 Internal Components (2 of 3) . . . . . . . . . . . . . . . . . . 8-12
Figure 8-5 Internal Components (3 of 3) . . . . . . . . . . . . . . . . . . 8-14
Figure 8-6 DC Controller/Formatter and Cables . . . . . . . . . . . . . . 8-16
Figure 8-7 Pickup Roller Assembly . . . . . . . . . . . . . . . . . . . . . 8-18
Figure 8-8 Feed Assembly . . . . . . . . . . . . . . . . . . . . . . . . . 8-20
Figure 8-9 Separation Guide Assembly . . . . . . . . . . . . . . . . . . . 8-22
Figure 8-10 Delivery Assembly . . . . . . . . . . . . . . . . . . . . . . . 8-24
Figure B-1 VCCI Statement (Japan) . . . . . . . . . . . . . . . . . . . . . B-4
List of Tables
Table 1-1 Printer Features . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Table 1-2 Paper Capacities and Sizes . . . . . . . . . . . . . . . . . . . . 1-3
Table 1-3 Performance Specifications . . . . . . . . . . . . . . . . . . . . 1-6
Table 1-4 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . 1-6
Table 1-5 Acoustic Emissions . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Table 1-6 Related Documentation . . . . . . . . . . . . . . . . . . . . . 1-11
Table 2-1 Environmental Requirements . . . . . . . . . . . . . . . . . . . 2-3
Table 2-2 Printer Dimensions . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Table 3-1 Indicator Lights (1 of 2) . . . . . . . . . . . . . . . . . . . . . . 3-4
Table 3-1 Indicator Lights (Continued 2 of 2) . . . . . . . . . . . . . . . . 3-5
Table 3-2 Front Panel Button Usage . . . . . . . . . . . . . . . . . . . . . 3-6
Table 4-1 Life Expectancy of Consumables . . . . . . . . . . . . . . . . . 4-3
Table 4-2 Cleaning Printer Components . . . . . . . . . . . . . . . . . . . 4-7
Table 5-1 Solenoid and Photosensors . . . . . . . . . . . . . . . . . . . 5-17
Table 5-2 Printer Timing . . . . . . . . . . . . . . . . . . . . . . . . . . 5-19
Table 7-1 Printer Status Messages (1 of 2) . . . . . . . . . . . . . . . . . . 7-8
Table 7-2 Printer Status Messages (Continued 2 of 2) . . . . . . . . . . . . 7-9
Table 7-3 Unclearable Error . . . . . . . . . . . . . . . . . . . . . . . . . 7-9
Table 7-4 Service and Error Messages (1 of 3) . . . . . . . . . . . . . . 7-10
Table 7-4 Service and Error Messages (Continued 2 of 3 ) . . . . . . . . 7-11
Table 7-4 Service and Error Messages (Continued 3 of 3) . . . . . . . . . 7-12
Table 7-5 High-Voltage Power Supply Check . . . . . . . . . . . . . . . 7-24
Table 7-6 Paper Curl Troubleshooting . . . . . . . . . . . . . . . . . . . 7-26
Table 7-7 Cable Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . 7-30
Table 7-8 Cable Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . 7-31
Table 8-1 Accessories and Supplies . . . . . . . . . . . . . . . . . . . . . 8-5
Table 8-2 Common Fasteners Used in the Printer . . . . . . . . . . . . . . 8-6
Table 8-3 Covers and Doors . . . . . . . . . . . . . . . . . . . . . . . . . 8-9
Table 8-4 Internal Components (1 of 3) . . . . . . . . . . . . . . . . . . 8-11
Table 8-5 Internal Components (2 of 3) . . . . . . . . . . . . . . . . . . 8-13
Table 8-5 Internal Components (3 of 3) . . . . . . . . . . . . . . . . . . 8-15
Table 8-6 ECU Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-17
Table A-1 Alphabetical Parts List . . . . . . . . . . . . . . . . . . . . . . A-2
Table A-2 Numerical Parts Index . . . . . . . . . . . . . . . . . . . . . . A-6
Product Information
Contents
Printer Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Paper Capacities and Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Model and Serial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Front/Side Views of the Printer . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Front Door Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Back View of the Printer . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Service Approach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
Parts Exchange Program . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
Ordering Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
Ordering Consumables . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
Ordering Related Documentation . . . . . . . . . . . . . . . . . . . . . 1-10
Technical Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
Worldwide Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
North American Response Center . . . . . . . . . . . . . . . . . . . . . 1-13
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
Warranty Exclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
Warranty Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
Voltage Conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
Product Information 1-1
Specifications
Category Specification
Print Speed*: HP LaserJet 5L
Print Speed*: HP LaserJet 6L
Monthly Usage (Duty Cycle): HP LaserJet 5L
Monthly Usage (Duty Cycle): HP LaserJet 6L
4,000 pages
6,000 pages
Life Expectancy of Toner Cartridge (pages)** 2,500 pages @ 5% coverage
First Print A4 <23 seconds
Letter <23 seconds
* Actual speed depends on data complexity and software handling efficiency.
** Toner cartridge life can be extended by using EconoMode.
Table 1-3 Performance Specifications
Volts Freq Amps Watts (typical)
120 Vac–10%
100 Vac–10%
50/60 Hz –2 Hz
50/60 Hz –2 Hz
3.5 @ 120v* printing = 100 (5L) 150 (6L)
SleepMode = 6 (5L) 4 (6L)
220 Vac–10%
240 Vac –10%
50 Hz –2 Hz
50 Hz –2 Hz
1.8 @ 230v printing = 100 (5L) 150 (6L)
SleepMode = 6 (5L) 4 (6L)
*Minimum recommended circuit capacity for product.
Table 1-4 Electrical Specifications
During Printing 5.6 Bels Sound Power Level ( per ISO 9296)
SilentDuring Standby & SleepMode
Table 1-5 Acoustic Emissions
1-6 Product Information
Parts and Diagrams
Contents
How to Use the Part Lists and Diagrams . . . . . . . . . . . . . . . . . . . . 8-3
Ordering Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
Ordering Consumables . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
Accessories and Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5
Common Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-6
Parts and Diagrams 8-1
Major Assembly Locations
Figure 8-1
Parts and
Diagrams
Parts and Diagrams 8-7


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