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HP LaserJet 5L and 6L Printer Service Manual

Service Manual

HP LaserJet 5L (C3941A)

HP LaserJet 6L (C3990A)

Copyright Hewlett-Packard Company 1997 All Rights Reserved. Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright laws. Publication number C3990-90991 First edition, May 1997

Warranty The information contained in this document is subject to change without notice. Hewlett-Packard makes no warranty of any kind with regard to this material, including, but not limited to, the implied warranties or merchantability and fitness for a particular purpose. Hewlett-Packard shall not be liable for errors contained herein or for incidental or consequential damaged in connection with the furnishing, performance, or use of this material.

WARNING Electrical Shock Hazard To avoid electrical shock, use only supplied power cords and connect only to properly grounded (3-hole) wall outlets.

Hewlett-Packard Company 11311 Chinden Boulevard Boise, Idaho 83714

Conventions
This manual uses the following conventions: Color is used to emphasize items which are important to the material under discussion. The names of major printer parts and assemblies are CAPITALIZED. Bold is used for emphasis, particularly in situations where italic type would be confusing. Italic type is used to indicate related documents or emphasis.
Note Caution WARNING!

Notes contain important information set off from the text. Caution messages alert you to the possibility of damage to equipment or loss of data. Warning messages alert you to the possibility of personal injury.

iii

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.

iv

List of Figures
Figure 1-1 Figure 1-2 Figure 1-3 Figure 1-4 Figure 1-5 Figure 2-1 Figure 2-2 Figure 3-1 Figure 3-2 Figure 3-3 Figure 4-1 Figure 4-2 Figure 5-1 Figure 5-2 Figure 5-3 Figure 5-4 Figure 5-5 Figure 5-6 Figure 5-7 Figure 5-8 Figure 6-1 Figure 6-2 Figure 6-3 Figure 6-4 Figure 6-5 Figure 6-6 Figure 6-7 Figure 6-8 Figure 6-9 Figure 6-10 Figure 6-11 Figure 6-12 Figure 6-13 Figure 6-14 Figure 6-15 Figure 6-16 Figure 6-17 Figure 6-18 Figure 6-19 Figure 6-20 Figure 6-21 Figure 6-22 Figure 6-23 HP LaserJet 5L Model and Serial Numbers . . . HP LaserJet 6L Model and Serial Numbers . . . Front/Side Views of the Printer . . . . . . . . . Front Door Assemblies . . . . . . . . . . . . . Back View of the Printer . . . . . . . . . . . . . Printer Space Requirements . . . . . . . . . . . Toner Cartridge Distribution . . . . . . . . . . . Self-test Page for HP LaserJet 5L . . . . . . . . Self-test Page for HP LaserJet 6L . . . . . . . . Engine Test Button . . . . . . . . . . . . . . . . Five Percent Text Coverage . . . . . . . . . . . Static Eliminator Teeth . . . . . . . . . . . . . Printer Functional Block Diagram . . . . . . . . DC Controller Loads . . . . . . . . . . . . . . . EconoMode vs Normal Mode . . . . . . . . . . Image Formation Block Diagram . . . . . . . . Simplified Paper Path . . . . . . . . . . . . . . Solenoid and Sensors . . . . . . . . . . . . . . General Timing Diagram HP LaserJet 5L . . . General Timing Diagram HP LaserJet 6L . . . Phillips and Posidriv screwdrivers . . . . . . . . Back Cover Removal (1 of 2) . . . . . . . . . . Back Cover Removal (2 of 2) . . . . . . . . . . EP Door Assembly Removal . . . . . . . . . . Memory Door Removal . . . . . . . . . . . . . Main Cover and Paper Input Assembly Removal Control Panel Removal . . . . . . . . . . . . . Exit Roller Removal . . . . . . . . . . . . . . . Delivery Assembly Removal (1 of 2) . . . . . . Delivery Assembly Removal (2 of 2) . . . . . . Fuser Pressure Plate Removal . . . . . . . . . . Fuser Pressure Plate Replacement . . . . . . . . Heating Element Removal (1 of 3) . . . . . . . Heating Element Removal (2 of 3) . . . . . . . Heating Element Removal (3 of 3) . . . . . . . Pressure Roller Removal . . . . . . . . . . . . . Face-Up/Face-Down Lever Replacement . . . . Fuser Exit Roller Removal . . . . . . . . . . . Paper Exit Sensor Flag Replacement . . . . . . Laser/Scanner Assembly Removal . . . . . . . Solenoid Removal (1 of 2) . . . . . . . . . . . . Solenoid Removal (2 of 2) . . . . . . . . . . . . Pickup Roller Assembly Removal (1 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 . . 1-5 . 1-7 . 1-8 . 1-9 . 2-4 . 2-6 . 3-7 . 3-8 3-10 . 4-4 . 4-8 . 5-3 . 5-4 5-10 5-12 5-16 5-17 5-20 5-21 . 6-4 . 6-6 . 6-7 . 6-8 . 6-9 6-10 6-11 6-12 6-13 6-14 6-15 6-16 6-17 6-18 6-19 6-20 6-21 6-22 6-23 6-24 6-25 6-26 6-27 v

Figure 6-24 Figure 6-25 Figure 6-26 Figure 6-27 Figure 6-28 Figure 6-29 Figure 6-30 Figure 6-31 Figure 6-32 Figure 6-33 Figure 6-34 Figure 6-35 Figure 6-36 Figure 6-37 Figure 6-38 Figure 6-39 Figure 6-40 Figure 6-41 Figure 6-42 Figure 6-43 Figure 7-1 Figure 7-2 Figure 7-3 Figure 7-4 Figure 7-5 Figure 7-6 Figure 7-7 Figure 7-8 Figure 7-9 Figure 8-1 Figure 8-2 Figure 8-3 Figure 8-4 Figure 8-5 Figure 8-6 Figure 8-7 Figure 8-8 Figure 8-9 Figure 8-10 Figure B-1

Pickup Roller Assembly Removal (2 of 2) . . . . . . . . . . . Paper Pickup Roller Assembly Replacement (Inside/Front View) Paper Feed Frame Removal (1 of 4) . . . . . . . . . . . . . . Paper Feed Frame Removal (2 of 4) . . . . . . . . . . . . . . Paper Feed Frame Removal (3 of 4) . . . . . . . . . . . . . . Paper Feed Frame Removal (4 of 4) . . . . . . . . . . . . . . Transfer Roller Guide & Transfer Roller Removal (Inside/Back View) . . . . . . . . . . . . . . . . . . . . . . . Kick Plate Removal . . . . . . . . . . . . . . . . . . . . . . . Kick Plate Spring Replacement . . . . . . . . . . . . . . . . . Separation Pad Removal . . . . . . . . . . . . . . . . . . . . Subpad Removal . . . . . . . . . . . . . . . . . . . . . . . . . Feed Assembly Removal (1 of 3) . . . . . . . . . . . . . . . . Feed Assembly Removal (2 of 3) . . . . . . . . . . . . . . . . Feed Assembly Removal (3 of 3) . . . . . . . . . . . . . . . . Memory Door Guide Removal . . . . . . . . . . . . . . . . . Motor Removal . . . . . . . . . . . . . . . . . . . . . . . . . DC Controller Removal (1 of 3) . . . . . . . . . . . . . . . . DC Controller Removal (2 of 3) . . . . . . . . . . . . . . . . DC Controller Removal (3 of 3) . . . . . . . . . . . . . . . . Formatter Board Removal . . . . . . . . . . . . . . . . . . . . Paper Path and Components . . . . . . . . . . . . . . . . . . . . DC Controller PCA Components . . . . . . . . . . . . . . . . . Heating Element Resistance Check . . . . . . . . . . . . . . . Engine Test . . . . . . . . . . . . . . . . . . . . . . . . . . . Toner Cartridge High Voltage Connection Points (1 of 2) . . . Toner Cartridge High Voltage Connection Points (2 of 2) . . . Overriding PS204 and SW101 . . . . . . . . . . . . . . . . . Repetitive Image Defect Ruler . . . . . . . . . . . . . . . . . Repetitive Image Defect Ruler . . . . . . . . . . . . . . . . . Major Assembly Locations . . . . . . . . . . . . . . . . . . . . Covers and Doors . . . . . . . . . . . . . . . . . . . . . . . . . Internal Components (1 of 3) . . . . . . . . . . . . . . . . . . Internal Components (2 of 3) . . . . . . . . . . . . . . . . . . Internal Components (3 of 3) . . . . . . . . . . . . . . . . . . DC Controller/Formatter and Cables . . . . . . . . . . . . . . Pickup Roller Assembly . . . . . . . . . . . . . . . . . . . . . Feed Assembly . . . . . . . . . . . . . . . . . . . . . . . . . Separation Guide Assembly . . . . . . . . . . . . . . . . . . . Delivery Assembly . . . . . . . . . . . . . . . . . . . . . . . VCCI Statement (Japan) . . . . . . . . . . . . . . . . . . . . .

6-28 6-29 6-30 6-31 6-32 6-33 6-34 6-35 6-36 6-37 6-38 6-39 6-40 6-41 6-42 6-43 6-44 6-45 6-46 6-47 7-5 7-6 7-11 7-21 7-24 7-25 7-27 7-28 7-29 8-7 8-8 8-10 8-12 8-14 8-16 8-18 8-20 8-22 8-24 B-4

vi

List of Tables
Table 1-1 Table 1-2 Table 1-3 Table 1-4 Table 1-5 Table 1-6 Table 2-1 Table 2-2 Table 3-1 Table 3-1 Table 3-2 Table 4-1 Table 4-2 Table 5-1 Table 5-2 Table 7-1 Table 7-2 Table 7-3 Table 7-4 Table 7-4 Table 7-4 Table 7-5 Table 7-6 Table 7-7 Table 7-8 Table 8-1 Table 8-2 Table 8-3 Table 8-4 Table 8-5 Table 8-5 Table 8-6 Table A-1 Table A-2 Printer Features . . . . . . . . . . . . . . . . . Paper Capacities and Sizes . . . . . . . . . . . Performance Specifications . . . . . . . . . . . Electrical Specifications . . . . . . . . . . . . . Acoustic Emissions . . . . . . . . . . . . . . . Related Documentation . . . . . . . . . . . . . Environmental Requirements . . . . . . . . . . Printer Dimensions . . . . . . . . . . . . . . . Indicator Lights (1 of 2) . . . . . . . . . . . . . Indicator Lights (Continued 2 of 2) . . . . . . . Front Panel Button Usage . . . . . . . . . . . . Life Expectancy of Consumables . . . . . . . . Cleaning Printer Components . . . . . . . . . . Solenoid and Photosensors . . . . . . . . . . . Printer Timing . . . . . . . . . . . . . . . . . . Printer Status Messages (1 of 2) . . . . . . . . . Printer Status Messages (Continued 2 of 2) . . . Unclearable Error . . . . . . . . . . . . . . . . Service and Error Messages (1 of 3) . . . . . . Service and Error Messages (Continued 2 of 3 ) Service and Error Messages (Continued 3 of 3) . High-Voltage Power Supply Check . . . . . . . Paper Curl Troubleshooting . . . . . . . . . . . Cable Pinouts . . . . . . . . . . . . . . . . . . Cable Pinouts . . . . . . . . . . . . . . . . . . Accessories and Supplies . . . . . . . . . . . . Common Fasteners Used in the Printer . . . . . Covers and Doors . . . . . . . . . . . . . . . . Internal Components (1 of 3) . . . . . . . . . . Internal Components (2 of 3) . . . . . . . . . . Internal Components (3 of 3) . . . . . . . . . . ECU Case . . . . . . . . . . . . . . . . . . . . Alphabetical Parts List . . . . . . . . . . . . . . Numerical Parts Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1-3 1-6 1-6 1-6 1-11 2-3 2-4 3-4 3-5 3-6 4-3 4-7 5-17 5-19 7-8 7-9 7-9 7-10 7-11 7-12 7-24 7-26 7-30 7-31 8-5 8-6 8-9 8-11 8-13 8-15 8-17 A-2 A-6

. . .

. . .

vii

viii

1
Product Information
Contents
Printer Features . . . . . . . . . . . Paper Capacities and Sizes . . . . Identification . . . . . . . . . . . . . Model and Serial . . . . . . . . . Specifications . . . . . . . . . . . . Product Overview . . . . . . . . . . Front/Side Views of the Printer . . Front Door Assemblies . . . . . . Back View of the Printer . . . . . Service Approach . . . . . . . . . . Parts Exchange Program . . . . . Ordering Parts . . . . . . . . . . Ordering Consumables . . . . . . Ordering Related Documentation Technical Assistance . . . . . . . . Worldwide Support . . . . . . . . North American Response Center Warranty . . . . . . . . . . . . . . . Warranty Exclusions . . . . . . . Warranty Limitations . . . . . . . Voltage Conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1-3 1-4 1-4 1-6 1-7 1-7 1-8 1-9 1-10 1-10 1-10 1-10 1-10 1-12 1-13 1-13 1-14 1-14 1-15 1-15

Product Information 1-1

1-2 Product Information

Printer Features
Table 1-1 Printer Features
Features Print Speed Text & Graphics Resolution Printer Language Monthly Usage (pages) Memory: Standard1 Maximum Memory Capacity Internal Typefaces Standard Interfaces Power Control Control Panel EconoMode (toner saving) Descriptions 4 ppm (HP LaserJet 5L); 6 ppm (HP LaserJet 6L) 300 or 600 dpi Enhanced PCL 5 4,000 pages (HP LaserJet 5L); 6,000 pages (HP LaserJet 6L) 1 Mbyte RAM (70nsec) 9 Mbyte total (available in increments of 1, 2, 4, and 8 Mbytes) 5 V JEDIA card2 26 Scalable Typefaces Parallel (Bi-tronics) SleepMode 3 LEDs 1 Front Panel Button Yes

Product 1 Information

1 Printer memory is optimized with Memory Enhancement technology (MEt). 2 JEDIA (Japanese Electronic Device Industry Association) is a group of DRAM suppliers who have standardized DRAM and other CMOS products.

Paper Capacities and Sizes
Table 1-2 Paper Capacities and Sizes
Features Paper Input Bin Capacity Paper Output Bin Capacity Single Sheet Input Bin Minimum Paper Size Maximum Paper Size Descriptions Holds up to 100 sheets of regular weight paper or up to 10 envelopes Holds up to 100 sheets 1 3x5 in. (76 mm x 127 mm) 8.5x14 in. (216 mm x 356 mm)

Product Information 1-3

Identification
Model and Serial
The model number and serial numbers are listed on identification labels located on the bottom of the printer. The model number is alphanumeric, such as C3941A for the HP LaserJet 5L printer, and C3990A for the HP LaserJet 6L printer. The serial number contains information about the Country of Origin, the Revision Level, the Production Code, and production number of the printer. The labels also contain power rating and regulatory information.
Figure 1-1

HP LaserJet 5L Model and Serial Numbers

1-4 Product Information

Figure 1-2 Product 1 Information

HP LaserJet 6L Model and Serial Numbers

Product Information 1-5

Specifications
Table 1-3 Performance Specifications
Category Print Speed*: HP LaserJet 5L Print Speed*: HP LaserJet 6L Monthly Usage (Duty Cycle): HP LaserJet 5L Monthly Usage (Duty Cycle): HP LaserJet 6L Life Expectancy of Toner Cartridge (pages)** First Print 4 ppm 6 ppm 4,000 pages 6,000 pages 2,500 pages @ 5% coverage A4 <23 seconds Letter <23 seconds Specification

* Actual speed depends on data complexity and software handling efficiency. ** Toner cartridge life can be extended by using EconoMode.

Table 1-4

Electrical Specifications
Volts 120 Vac 10% 100 Vac 10% 220 Vac 10% 240 Vac 10% Freq 50/60 Hz 2 Hz 50/60 Hz 2 Hz 50 Hz 2 Hz 50 Hz 2 Hz Amps 3.5 @ 120v* 1.8 @ 230v Watts (typical) printing = 100 (5L) SleepMode = 6 (5L) printing = 100 (5L) SleepMode = 6 (5L) 150 (6L) 4 (6L) 150 (6L) 4 (6L)

*Minimum recommended circuit capacity for product.

Table 1-5

Acoustic Emissions
During Printing During Standby & SleepMode 5.6 Bels Sound Power Level ( per ISO 9296) Silent

1-6 Product Information

Product Overview
Figure 1-3

Product 1 Information

Front/Side Views of the Printer
1. Paper Input Support 2. Paper Output Support 3. Paper Guides 4. Error (top) Light 5. Data (middle) Light 6. Ready (bottom) Light 7. Front Panel Button 8. Paper Output Bin 9. Paper Path Lever 10. Serial and Model Number (under printer) 11. Paper Input Bin 12. Single Sheet Input Slot 13. Front Output Slot (face-up)

Product Information 1-7

Figure 1-4

Front Door Assemblies
14. Paper Release Lever 15. Toner Cartridge Compartment 16. Transfer Roller (do not touch) 17. EP Door

1-8 Product Information

Figure 1-5

I Product 1 Information

Back View of the Printer
18. Power Cable Connector 19. Parallel Cable Connector 20. Memory Expansion Cover

Product Information 1-9

Service Approach
Repair of the printer normally begins with the use of the printer's internal diagnostics in conjunction with the troubleshooting procedures in Chapter 7. Once a faulty part is located, repair is generally accomplished by assembly level replacement of Field Replaceable Units (FRUs). Some mechanical assemblies may be repaired at the subassembly level. PCA component replacement is not supported by Hewlett-Packard. Part numbers for all FRUs are located in Chapter 8 of this manual.

Parts Exchange Program
HP offers remanufactured assemblies for some selected parts. These are identified in Chapter 8 and can be ordered through HP's Parts Direct Ordering (PDO), or Parts Center Europe (PCE).

Ordering Parts
Field replaceable part numbers are found in Chapter 8 of this manual. Replacement parts may be ordered through HP's Parts Direct Ordering (PDO), or Parts Center Europe (PCE).

Ordering Consumables
The printer has no consumables other than the toner cartridge, which may be ordered directly from Hewlett-Packard. Refer to Chapter 8 for ordering information.

Ordering Related Documentation
Table 1-6 on the following page lists part numbers and where to order related documentation. Phone numbers for the various sources are:

Parts Direct Ordering (PDO) Parts Center Europe (PCE)
(49 7031) 14-2253 1-800-227-8164 (U.S. only)

HP's Distribution Center (HPD) URL for HP Access: http://www.hp.com URL for Software and Support: http://www.hp.com/cposupport/cpoindex.html
970-339-7009 (U.S. only)

1-10 Product Information

Table 1-6

Related Documentation Product 1 Information
Description HP LaserJet Family Quick Reference Service Guide HP LaserJet 5L Printer User's Manual HP LaserJet 6L Printer User's Manual HP PCL5 Printer Language Technical Reference Information Package HP LaserJet Printer Family Paper Specifications Guide LaserJet Basic Hardware Training Course HPLJ 5L and 6L Hardware Training Kit Part Number 5021-0369 C3941-90901 C3990-90901 5010-3994 5021-0368 5961-0880 C3990+49A-60001 (NTSC) C3990+49A-60002 (PAL) C3990-99001 PDO X X X X X X X X X X X X X X X PCE X HPD

HP LaserJet 6L Printer Service Manual Bundle includes: Service Manual C3990-90991 Paper Specifications Guide 5021-0368 Quick Ref. Pocket Guide 5021-0369 HP LaserJet 6L Printer NTSC Kit includes: Box 9211-6385 6L Video Kit Label C3990-00010 6L Combined Test Kit C3990-67902 6L Video Tape C3990-99002 HP LaserJet 6L Printer PAL Kit includes: Cardboard Sleeve 5002-0556 VHS-PAL Tape 5010-6306 6L Spine Label C3990-00012 6L Face Label C3990-00013 6L Pal Kit Label C3990-00014 HP LaserJet 6L Combined Test Kit includes: Return Envelopes 5002-0562 Final Exam 5960-6642 6L Test Kit Label C3990-00011 6L Test Books (5 total) C3990-90992 Note: the five Test Books are labeled "A" through "E." Specific Application Drivers

C3990-67901

X

X

C3990-67903

X

X

C3990-67902

X

X

X

Product Information 1-11

Technical Assistance
Online Services: for 24-hour access to information over your modem, we suggest these services. World Wide Web URL--Printer drivers, updated HP printer software, and product and support information may be obtained from http://www.hp.com, or in Europe from http://www2.hp.com. In Japan printer drivers may be obtained from ftp://www.jpn.hp.com/drivers/. Korea: www.hp.co.kr. Taiwan: www.hp.com.tw, with a local driver website of www.dds.com.tw. HP Bulletin Board Service--Our electronic download service provides convenient access to HP printer drivers, updated HP printer software, product information, and troubleshooting hints. Dial (208) 344-1691 (U.S. and Canada) and set your communication software to N,8,1. European Bulletin Board Service numbers are listed at http://www2.hp.com. Taiwan: (886-2) 923-3233. Korea: HITEL or CHOLIAN (Go HPK). Australia: (613) 9890 0276. New Zealand: (649) 356-3660. America OnLine--(America OnLine/Bertelsmann available in France, Germany, and UK)--Printer drivers, updated HP printer software, and support documentation are available to help you answer your HP product questions. Use Keyword HP to start your tour. CompuServe--Printer drivers, updated HP printer software, and interactive sharing of technical information with other members are available on CompuServe's HP User's forums (GO HP), or call (800) 524-3388 and ask for representative #51. (CompuServe is also available in the UK, France, Belgium, Switzerland, Germany, and Austria.) Obtaining Software Utilities and Electronic Information: U.S. and Canada Asia-Pacific Countries Australia/New Zealand HP Direct Ordering for Accessories and Supplies HP Support Assistant CD-ROM HP Service Information HP Service Agreements Phone: Fax: (970) 339-7009 (970) 330-7655 Mail: Hewlett-Packard P Box 1754 .O. Greeley, CO 80632 USA

Fulfill Plus (65) 740-4477 (Singapore, Malaysia, Indonesia, Hong Kong). Call (612) 565-6099. Call (800) 446-0522 (U.S.) or (800) 387-8164 (Canada). This support tool offers a comprehensive online information system designed to provide technical and product information on HP products. To subscribe to this quarterly service in the U.S. or Canada, call (800) 457-1762. Fulfill Plus, (65) 740-4477 (Singapore, Malaysia, Indonesia, Hong Kong). To locate HP-authorized dealers, call (800) 243-9816 (U.S.); (800) 387-3867 (Canada). Call (800) 446-0522 (U.S.); (800) 268-1221 (Canada).

HP FIRST: HP FIRST Fax will deliver detailed troubleshooting information on common software applications and troubleshooting tips for your HP product. Call from any touch-tone phone and request up to three documents per call. These documents will be sent to the fax of your choice. Australia Austria Belgium (Dutch) Belgium (French) Canada China Denmark English outside of UK Finland France Germany Hong Kong India Indonesia Italy Japan (03) 9272-2627 0660-8128 0800-1-1906 0800-1-7043 (800) 333-1917 (86 10) 6505 5280 800-10453 (31 20) 681-5792 9800-13134 05-905900 0130-810061 (852) 2506-2422 (011) 622-6420 (21) 352-2044 1678-59020 (813) 3335-8622 Korea Malaysia Netherlands New Zealand Norway Philippines Singapore Spain Sweden Switzerland (German) Switzerland (French) Taiwan Thailand United Kingdom United States (02) 769-0543 (03) 298-2478 0800-22-2420 (09) 356 6642 800-11319 (65) 291-7951 (65) 275-7251 900-993123 020-795743 0800 55-1527 0800 55-1526 02-719-5589 (02) 661-3511 0800-960271 (800) 333-1917

1-12 Product Information

Worldwide Support
U.S. and Canada: Customer Support & Product Repair Assistance (Please refer to the warranty chapter of this manual for additional product repair information.) Call (208) 323-2551 Mon-Fri 6 am to 10 pm and Saturday 9 am to 4 pm (Mountain Time) free of charge during the Warranty Period; however, your standard long-distance phone charges still apply. Please have your serial number ready when calling. Post-warranty telephone assistance is available to answer your product questions. Call (900) 555-1500 ($2.50* per minute, U.S. only), or call (800) 999-1148 ($25* per call, Visa or MasterCard, U.S. and Canada) Mon-Fri 7 am to 6 pm and Saturday from 9 am to 3 pm (Mountain Time). Charges begin only when you connect with a support technician. *Prices subject to change. European Customer Support Center Language and In-Country Options Available Open Monday-Friday 8:30-18:00 CET HP provides a free telephone support service during the warranty period. By calling a telephone number listed below, you will be connected to a responsive team waiting to help you. If you require support after your warranty has expired, you can receive support for a fee through the same telephone number. The fee is charged on a per-incident basis. When calling HP please have the following information ready: Product name and serial number Date of purchase Description of the problem Dutch English Belgium: Netherlands: Ireland: UK: International: France: Belgium: Switzerland: Germany: Austria: 02 626 8806 020 606 8751 01 662 5525 0171 512 5202 44 171 512 52 02 04 50 43 9853 02 626 8807 084 880 1111 0180 5 25 81 43 0660 6386 Norwegian Danish Finnish Swedish Italian Spanish Portuguese Norway: Denmark: Finland: Sweden: Italy: Spain: Portugal: 22 11 6299 3929 4099 0203 47288 08 619 2170 02 26410350 902 321 123 01 441 7199

Product 1 Information

French

German

In-Country Support Numbers Africa/Middle East Argentina Australia Brazil Canada China Czech Republic Greece Hong Kong Hungary India Indonesia Japan Korea (41 22) 780-7111 (54 1) 781-4059/69 (03) 9272 8000 (55 11) 709-1444 (208) 323-2551 (8610) 6261-4174; 6261-4175; 6261-4176; 6262-5666 (42 2) 471 7321 (30 1) 689 64 11 800-7729 (36 1) 252 4505 (011) 6472366 (21) 350-3408 (31 20) 581-3318 (82 2) 3270-0700; outside Seoul, call 080-999-0700 Malaysia Mexico D.F. Mexico Guadalajara Mexico Monterey New Zealand Philippines Poland Portugal Russia Singapore Switzerla nd Taiwan Thailand Turkey (603) 295-2566 (52 5) 326-4600 (52 3) 669 95 00 (52 83) 378 42 40 (64 9) 356-6640 (63 2) 894-1451 (48 22) 37-5065 (351 1) 301 7330 (7 095) 923-5001 (65) 272-5300 (41 1) 753 7111 (02) 717-9609 (662) 661-4011; 661-4012 (90 1) 224-5925

North American Response Center
The North American Response Center (NARC) is available for technical support to assist service technicians. The NARC can be reached at 1-800-544-9976. To access this service, HP resellers must have a valid CZ number.

Product Information 1-13

Warranty
This warranty gives you specific legal rights. You may also have other rights, which may vary from area to area. Hewlett-Packard warrants the 5L and 6L LaserJet printers against defects in materials and workmanship for a period of one year from the date of purchase by the end user and is not transferable. During the warranty period, Hewlett-Packard will, at its option, either repair or replace hardware products that prove to be defective. Should Hewlett-Packard be unable to repair or replace the product within a reasonable amount of time, a refund of the purchase price may be made upon return of the product. To have your printer serviced by Hewlett-Packard, you must make arrangements to have it serviced in the country of purchase.

Warranty Exclusions
The warranty on your HP LaserJet printer shall not apply to defects or damage resulting from:



Improper or inadequate maintenance by customer. Customer-supplied software or interfacing. Unauthorized modification or misuse. Operation outside of the environmental specifications for the product. Operation of nonsupported printing media. Duty cycle abuse (see later explanation). Operating the printer from a mechanical switchbox without a designated surge protector. Improper site preparation and maintenance. Use of non-HP toner cartridges (see explanation) or DRAM (JEDIA) memory cards. The use of non-Hewlett-Packard toner cartridges does not affect either the warranty or any maintenance contract purchased from Hewlett-Packard. However, if an HP LaserJet printer failure or printer damage is found to be directly attributable to the use of any non-HP product, the repair will not be covered under the warranty or HP maintenance contract. Hewlett-Packard cannot recommend use of non-HP toner cartridges, either new or remanufactured, because they are not HP products and Hewlett-Packard cannot influence or control their quality. Operation of the printer beyond the limit of its duty cycle (printing more than the equivalent of 4,000 single-sided pages per month on the HP LaserJet 5L or more than the equivalent of 6,000 single-sided pages per month on the HP LaserJet 6L) shall be deemed printer abuse and all repairs thereafter will be billed on a time and materials basis. 1-14 Product Information

If you are using a mechanical switchbox, ensure that it is equipped with a surge protector. Damage to your printer could occur from the use of unprotected mechanical switchboxes. The warranty period begins either on the date of delivery or, where the purchase price includes installation by Hewlett-Packard, on the date of installation.

Product 1 Information

Warranty Limitations
The warranty set forth above is exclusive and no other warranty, whether written or oral, is expressed or implied. Hewlett-Packard specifically disclaims the implied warranties of merchantability and fitness for a particular purpose. Some areas do not allow limitations on how long an implied warranty lasts, so the preceding limitation or exclusion may not apply to you. However, any implied warranty of merchantability or fitness is limited to the one-year duration of this written warranty. In no event will Hewlett-Packard or its suppliers be liable to you for any consequential or incidental damages, including any lost profits or lost savings, or for any claim by any party, even if a representative of HP or its suppliers has been advised of the possibility of such damages. Some areas, states, or provinces do not allow the exclusion or limitation of incidental or consequential damages, so the preceding limitation or exclusion may not apply to you.

Voltage Conversions
HP LaserJet printers are manufactured to different specifications for different countries. Because of these differences, HP does not recommend transporting products sold within one country to another country. In addition to the 115-220 voltage environment concerns, the country of final destination may have different import and export restrictions, power frequencies, and regulatory requirements.
Note

The HP LaserJet family printers must be serviced by an authorized repair depot or reseller within the country where the printer was originally purchased. Because of the different specifications and warranty coverage limitations, Hewlett-Packard does not offer a conversion, or support the conversion, of HP LaserJet family printers. We advise those customers planning to transport equipment to different countries to purchase the products in the country of final destination.

Product Information 1-15

1-16 Product Information

2
Site Requirements
Contents
Site Requirements . . . . . . . . . . . . Operating Environment . . . . . . . . Printer Space Requirements . . . . . . . The HP C3906A/F Toner Cartridge . . . Storage Conditions . . . . . . . . . . Storing Opened Toner Cartridges . . Toner Cartridge Handling Suggestions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 2-3 2-4 2-5 2-5 2-5 2-6

Site Requirements

2 -1

2 -2 Site Requirements

Site Requirements
Operating Environment
The environmental requirements listed in the table below must be maintained to ensure the proper operation of this printer.
Table 2-1 Environmental Requirements
LaserJet 5L/6L & Cartridge Temperature Humidity Operating 50 to 90.5 F (10 to 32.5 C) 20 to 80% RH (with no condensation) Storage

Site 2 Requirements

32 to 104 F (0 to 40 C) 10 to 80% RH (with no condensation)

Consider the following points before installing the printer:

Install in a well-ventilated, dust-free area. Install on a hard, flat and continuous surface, with all four printer feet level. Do
not install on carpet or other soft surfaces.

Ensure adequate power is supplied. Printer power requirements are listed under
"Specifications," in Chapter 1. Uninterruptible power supplies (UPS) should not be used with this printer.

Install away from direct sunlight, open flames, or ammonia fumes. If the printer
is placed near a window, make sure the window has a curtain or blind to block any direct sunlight.

Install with enough space around the printer for proper access and ventilation.
(See Figure 2-1.)

Install printer away from the direct flow of exhaust from air ventilation systems.

Site Requirements

2 -3

Printer Space Requirements
Figure 2-1

Printer Space Requirements Table 2-2 Printer Dimensions
Description Width Depth Height (storage) (operational) Weight (with toner cartridge) Toner cartridge weight** * With letter input assembly extended. ** Some quantity of toner will reside in the waste toner area of a toner cartridge when the toner supply is exhausted. Therefore, using toner cartridge weight may be an unreliable indication of remaining toner supply. Dimension 13.2 in. (335.5 mm) 12.3 in. (311.2 mm) 8.9 in. (227.5 mm) 14.6 in. (372.7 mm)* 15.9 lbs. (7.2 kg) 1.5 lbs. (.7 kg)

2 -4 Site Requirements

The HP C3906A/F Toner Cartridge
Toner cartridges contain components that are sensitive to light, temperature, and humidity. Follow the recommendations in this section to ensure the highest quality and longest life of HP toner cartridges. Keep the printer within the following environmental conditions for optimum performance.

Storage Conditions
The toner cartridge is affected by its environment. Packaging protects the toner cartridge from light and increases its storage life. It is important to store the cartridge in its original packaging until the cartridge is ready to be installed in the printer. When storing the toner cartridge in a warehouse or work area, make sure the storage place meets the conditions specified in Table 2-1.

Site 2 Requirements

Storing Opened Toner Cartridges
Because the cartridge does not have a shutter to cover the laser beam access slot, it should be kept inside the printer until empty. Toner cartridges which have had the toner sealing tape removed are also more vulnerable to environmental extremes (such as high humidity). If the toner cartridge must be removed from the printer, always store the cartridge:


Caution

Inside the protective bag in which it was originally packaged. In a dark cabinet, away from direct sunlight. Correct side up and in a horizontal position (not standing on end). At a temperature between 32 to 104 F (0 and 40 C). Away from ammonia or other organic solvent fumes.

Never ship the printer with a toner cartridge installed. Excessive vibration during shipping can cause toner to leak, contaminating the printer. Never expose the toner cartridge to direct sunlight or to room light for more than a few minutes. Bright light and direct sunlight can permanently damage a toner cartridge. The C3906F toner cartridge is designed specifically for use in the environmental conditions of the Asia Pacific region and is only available in that region.

Note

Site Requirements

2 -5

Toner Cartridge Handling Suggestions
Before installing a cartridge, distribute the toner evenly by rotating the cartridge
back and forth five to six times. (See Figure 2-2.) Repeat this action when toner begins to run low.
Figure 2-2

Ton

erC

artri

dge

C39

06A

Toner Cartridge Distribution

Do not touch the surface of the photosensitive drum in the cartridge. Protect the Do not expose the cartridge to unnecessary vibrations or shock. Do not expose the photosensitive drum to strong light. Blurred areas on the page
may indicate that the drum has been exposed to light for too long. This causes permanent damage to the photosensitive drum. Replace the cartridge. Never manually rotate the drum, especially in the reverse directions; internal damage and toner spills may result. Do not install the toner cartridge in the printer for shipping. drum from light and contamination.

2 -6 Site Requirements

3
Operating Overview
Contents
Using the Control Panel . Control Panel Layout . LED Lights . . . . . . The Front Panel Button Printing a Self-Test Page . Continuous Self Test . Printing an Engine Test . Resetting the Printer . . . To Reset the Printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 3-3 3-4 3-6 3-7 3-9 3-10 3-11 3-11

Operating Overview 3-1

3-2 Operating Overview

Using the Control Panel
Control Panel Layout
The Control Panel consists of three status lights and a Front Panel Button located at the front of the printer. The Control Panel consists of one button and three status lights. ERROR (Yellow) DATA (Green) READY (Green)
+

These lights can be in only one of the following states:
OFF ON

+ Blinking

Installation and 3 Configuration

Operating Overview 3-3

LED Lights
The LED lights provide a quick way to check the printer's status.
Table 3-1
When this Indicator:

Indicator Lights (1 of 2)
Looks like this: On Blinking It means this: Ready Ready to print. Print job in progress. Let job finish printing. Do this:

On

Form Feed There is unprinted data in the buffer.

Briefly press the Front Panel Button to print the remaining data.

Blinking

Manual Feed The printer is in manual feed mode.

Make sure you have the correct paper in the Single Sheet Input Bin, and briefly press and release the Front Panel Button to print.

On

Error (light continuously on) Printer is out of paper. Printer's EP door is open. Toner cartridge is either missing or not installed correctly. There is paper jammed in the printer. Add paper. Close the door. Install a cartridge, being careful to position it correctly. Clear the jam and resume printing. If the Error light remains lit after checking for these problems, and there's no paper jam, disconnect the power for 10 seconds, then reconnect to the power source. If, after taking these actions, the light remains on, refer to Chapter 7, "Troubleshooting."

3-4 Operating Overview

Table 3-1
When this indicator:

Indicator Lights (Continued 2 of 2)
Looks like this: Blinking It means this: Error (light blinking) Page Too Complex Do this: Briefly press and release the Front Panel Button to continue printing. There may be some data loss on the page.

The page may be too complex for the printer's memory capacity Hint: To avoid this in the future: or the printer may not be able to create the image fast enough to 1. See your printer driver help for more suggestions regarding printer memory usage. keep pace with the engine printing process. 2. Reduce resolution to 300 dpi with your software. 3. Install additional printer memory. (See chapter 6 for information on installing additional memory.) All off Sleep Mode Either the printer is in SleepMode or the power source has been disabled. No action is necessary. When you press the Front Panel Button, send data to the printer, or open the printer door, the status light comes on.

All on

Hardware Error There is an internal problem that won't allow printing.

1. If you have added an additional memory card, try removing it. 2. Disconnect the power for 10 seconds, then reconnect it. 3. If all of the lights come on steadily again, try disconnecting the power for 15 minutes. If this error remains after completing the tasks above, see Chapter 7, "Troubleshooting."

Installation and 3 Configuration

All Blinking

Memory Error An incompatible For memory card specifications, see the memory card has been installed. HP LaserJet 5L User's Manual, appendix D, or the HP LaserJet 6L User's Manual, page 1-10. The memory card must be a 70 nsec or faster card.

Operating Overview 3-5

The Front Panel Button
Depending on what state the printer is in, pressing the Front Panel Button allows you to control printing tasks by either starting or resuming a printer function. Use the Front Panel Button to accomplish the following tasks:
Table 3-2
Function Wake Up Self Test Printer Reset

Front Panel Button Usage
Lights All lights are off while plugged into power source. Ready (bottom) light is on and the other lights are off. The Ready (bottom) Light will remain lit, if there are no printer errors. Action Briefly push and release the button. Briefly push and release the button. Press and hold the button until the three Front Panel Lights blink quickly in succession. Briefly push and release the button. Briefly push and release the button. Briefly push and release the button. Result The printer will wake up to a ready state. Prints a self-test page. The reset will return the printer to the factory default settings. This clears all data from memory, including any downloaded fonts and macros. Override manual feed to print from paper cassette. Allows the printer to recover and continue printing the job. The remaining data in printer memory will print.

Resume (from Manual Feed) Continue (from memory error) Form Feed

The Data (middle) Light blinks. Error (top) light blinks. The Data (middle) Light and the Ready (bottom) Light both remain on.

3-6 Operating Overview

Printing a Self-Test Page
A self-test page can be useful in troubleshooting printer problems and determining which fonts have been downloaded to the printer.
Figure 3-1

Installation and 3 Configuration

Self-test Page for HP LaserJet 5L

Operating Overview 3-7

Figure 3-2

Self-test Page for HP LaserJet 6L

The self-test page lists the current printer configuration. (If any fonts have been downloaded to the printer a second page will print.) To print a self-test page:
1 Make sure the Ready (bottom) Light is on, and all other lights are off. Wake up the

printer if necessary by pressing the Front Panel Button.
2 Briefly press and release the Front Panel Button. The Data (middle) Light comes

on, the Ready (bottom) Light blinks. Wait for a self-test page to print.

3-8 Operating Overview

Continuous Self Test
A continuous self test can be useful for troubleshooting paper path and other problems. To print a continuous self test:
1 Disconnect the printer from the power source. 2 Press and hold down the Front Panel Button while connecting power. 3 Continue holding the button for about five seconds.

All lights will illuminate at once, then each will light in sequence.
4 Release the button. The printer conducts its internal diagnostics routine, then prints

the self-test page continuously until stopped. 5 To stop the continuous self test (and reset the printer), press and hold the Front Panel Button for a few seconds until all lights begin lighting in sequence once again.
Note

The self test does not print at the printer's rated speed of four pages per minute (HP LaserJet 5L) or six pages per minute (HP LaserJet 6L). The engine test prints at the printer's rated speed.

Installation and 3 Configuration

Operating Overview 3-9

Printing an Engine Test
The engine test print can be used to verify that the print engine is functioning correctly. The Formatter PCA is completely bypassed during an engine test. Consequently, this test is useful for isolating engine printer problems. The engine test prints a full page of vertical lines down the entire printable area. This page is useful for checking and adjusting registration.
Note

Perform the engine test with the printer covers in place, as shown in Figure 3-6. Refer to "Engine Test" in Chapter 7 for the engine test procedure.

Figure 3-3

Engine Test Button

3-10 Operating Overview

Resetting the Printer
Resetting the printer accomplishes the following:

Clears all data from the printer's memory (including unprinted data, downloaded Stops any printing that is taking place and ejects the page. Removes some error conditions. Resets the printer to its factory default settings.
fonts, and macros).

To Reset the Printer
Press and hold the Front Panel Button until the three control panel lights blink quickly in succession (about 5 seconds), then let go of the button. After resetting, the Ready (bottom) Light will remain lit if there are no printer errors. (Make sure there is paper in the printer or the error light will remain on.)

Installation and 3 Configuration

Operating Overview 3-11

3-12 Operating Overview

4
Printer Maintenance
Contents
Life Expectancy of Consumables . Toner Cartridge Life . . . . . . . Saving Toner with EconoMode Refilled Toner Cartridges . . . Recycling Toner Cartridges . . Cleaning the Printer . . . . . . . . Cleaning Printer Components . Cleaning Spilled Toner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 4-4 4-4 4-5 4-5 4-6 4-7 4-8

Printer Maintenance

4-1

4-2 Printer Maintenance

Life Expectancy of Consumables
Always inspect the components listed in Table 4-1 for wear when servicing the printer. Replace these components as needed, based on printer failures or wear, not strictly on usage.
Table 4-1 Life Expectancy of Consumables
Description Toner Cartridge (user replaceable) HP LaserJet 5L Part Number C3906A HP LaserJet 6L Part Number C3906A Est Life (pgs) 2,500* Remarks When print becomes faint, shake cartridge to distribute remaining toner. May affect print quality and/or paper movement. Look for glazing and/or cracks. May affect paper movement. May affect print quality and/or paper movement. Look for marks on pressure roller or upper Teflon sleeve.

Transfer Roller Paper Pickup Assembly Separation Pad & Sub pads

RF5-1534-000CN

RF5-1534-000CN

50,000

RG5-1940-000CN RG5-3486-000CN 50,000 RY7-5008-000CN RY7-5008-000CN 50,000

RG5-1964-000CN RG5-3459-000CN 50,000 Heating Element 100-120 V, 50/60 Hz 220-240 V, 50 Hz Pressure Roller
*

RG5-1965-000CN RG5-3463-000CN RF5-1516-000CN RF5-2362-000CN

The estimated toner cartridge life is based on Letter or A4 size paper with an average of 5% toner coverage and a medium density setting. Toner cartridge life can be extended further by conserving toner using the printer's EconoMode feature.

4 Maintenance
Printer Maintenance 4-3

Toner Cartridge Life
The toner cartridge has been designed to simplify the replacement of the printer's major "consumable" parts. The toner cartridge contains the printing mechanism and a supply of toner. When using a typical word-processing application, a toner cartridge will print approximately 2500 pages where the text covers about 5% of the page.
Figure 4-1

Five Percent Text Coverage

When regularly printing pages with less coverage, such as short memos, a toner cartridge should print over 2500 pages. However, if routinely printing very dense print, the cartridge will not print a full 2500 pages.
Note

For best results, always use a toner cartridge before the expiration date stamped on the toner cartridge box.

Saving Toner with EconoMode
Toner cartridge life can be extended dramatically by using the EconoMode printing feature of the printer. EconoMode uses approximately 50% less toner than normal printing. The printed page is much lighter and is adequate for printing drafts or

4-4 Printer Maintenance

proofs. EconoMode can be set through your printer driver. See Chapter 3 for information.
Notes

Some software applications may refer to this as "draft mode."

Refilled Toner Cartridges
While Hewlett-Packard does not prohibit the use of refilled toner cartridges during the warranty period or while under a maintenance contract, we do not recommend their use. The reasons for this are:

Hewlett-Packard has no control or process to ensure that a refilled toner cartridge
functions at the high level of reliability of a new HP LaserJet toner cartridge. Hewlett-Packard also cannot predict what the long-term reliability effect on the printer is from using different toner formulations found in refilled cartridges. Hewlett-Packard has no control over the actual print quality of a refilled toner cartridge. The print quality of HP LaserJet toner cartridges influences the customer's perception of the printer. Repairs resulting from the use of refilled toner cartridges are not covered under the HP warranty or maintenance contract.

Recycling Toner Cartridges
In order to reduce waste, Hewlett-Packard has adopted a recycling program for used toner cartridges. Plastics and other material are recycled. Cartridge components that do not wear out are reused. HP pays the shipping costs from the user to the recycling plant. For each cartridge returned, HP donates one U.S. dollar to be shared by the Nature Conservancy and the National Wildlife Federation. To join this recycling effort, follow the instructions inside the toner cartridge box.

4 Maintenance

Printer Maintenance

4-5

Cleaning the Printer
To maintain the print quality, thoroughly clean the printer:

Every time you change the toner cartridge. After printing approximately 2,500 pages. Whenever print quality problems occur.
Clean the outside of the printer with a lightly water-dampened cloth. Clean the inside with only a dry, lint-free cloth. Observe the warnings and cautions below.
WARNING!

Before you begin these steps, unplug the printer to avoid shock hazard. When cleaning around the front door area, avoid touching the heating element. It may be HOT. (For heating element location, see Figure 6-14.)

4-6 Printer Maintenance

Cleaning Printer Components
CAUTION

To avoid permanent damage to the toner cartridge, do not use ammonia-based cleaners on or around the printer. Do not touch the transfer roller with your fingers. Contaminants on the roller can cause print quality problems.
Cleaning Printer Components
COMPONENT Outside Covers Inside General Exit Roller Fuser Exit Roller Pickup Roller Pressure Roller Transfer Roller Separation Pad Delivery Assembly Static Eliminator Teeth CLEANING METHOD/NOTES Use a water-dampened cloth. Do not use solvents or ammonia-based cleaners. Use a dry, lint free cloth. Remove all dust, spilled toner, and paper particles. Use a water-dampened lint-free cloth. (For location, see Figure 6-8.) Use a water-dampened lint-free cloth. (For location, see Figure 6-18.) Use a lint-free cloth dampened with isopropyl alcohol. (For location, see Figure 6-25.) Use a dry lint-free cloth. (For location, see Figure 6-16.) Use a dry, lint-free cloth. DO NOT TOUCH with your fingers. (For location, see Figure 6-30.) Use a dry lint-free cloth. (For location, see Figure 6-31.) Use a water-dampened lint-free cloth. (For location, see Figure 6-10.) Use compressed air. (See Figure 4-2 on the following page for static eliminator teeth location.)

Table 4-2

4 Maintenance
Printer Maintenance 4-7

Figure 4-2

Static Eliminator Teeth (located in front of the transfer roller)

Cleaning Spilled Toner
Defective toner cartridges can develop leaks. In addition, after a paper jam has occurred, there may be some toner remaining on the rollers and guides inside the printer. The pages that print immediately after the jam may pick up this toner. Clean spilled toner with a cloth slightly dampened in cold water. Do not touch the Transfer Roller with the damp cloth or with your fingers. Do not use a vacuum cleaner unless it is equipped with a micro-fine particle filter.
Note

If toner gets on your clothing, use cold water to remove it. Hot water sets toner stains into fabric.

4-8 Printer Maintenance

5
Functional Overview
Contents
Basic Printer Functions . . . . . . . . . . . DC Controller/Power System . . . . . . . . Print Engine Control System . . . . . . . Power System (on DC Controller PCA) . Formatter System . . . . . . . . . . . . . . CPU . . . . . . . . . . . . . . . . . . . . Read Only Memory (ROM) . . . . . . . Random Access Memory (RAM) . . . . Parallel Interface . . . . . . . . . . . . . Control Panel . . . . . . . . . . . . . . . Resolution Enhancement (REt) . . . . . . EconoMode . . . . . . . . . . . . . . . . Memory Enhancement technology (MEt) Enhanced I/O . . . . . . . . . . . . . . . Page Protect . . . . . . . . . . . . . . . . PJL Overview . . . . . . . . . . . . . . Image Formation System . . . . . . . . . . Toner Cartridge . . . . . . . . . . . . . . Step 1: Drum Cleaning . . . . . . . . . . Step 2: Drum Conditioning . . . . . . . . Step 3: Image Writing . . . . . . . . . . Step 4: Image Developing . . . . . . . . Step 5: Image Transferring . . . . . . . . Step 6: Image Fusing . . . . . . . . . . . Paper Feed System . . . . . . . . . . . . . . Paper Jam Detection . . . . . . . . . . . Basic Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3 5-4 5-5 5-6 5-8 5-8 5-8 5-8 5-8 5-9 5-9 5-10 5-10 5-11 5-11 5-11 5-12 5-13 5-13 5-13 5-13 5-14 5-14 5-14 5-15 5-18 5-19

Functional Overview

5-1

5-2

Functional Overview

Basic Printer Functions
This chapter presents a generalized functional overview of the printer and the printing processes. The following printer systems are discussed:



DC Controller System/ Power System Formatter System Image Formation System Paper Feed System Laser/Scanner System Figure 5-1 is a generalized block diagram of the printer:

Figure 5-1

Printer Functional Block Diagram

Functional 5 Overview

Functional Overview

5-3

DC Controller/Power System
The DC Controller PCA coordinates all print engine activities, drives the laser, and coordinates print data from the Formatter PCA with the image formation process. The DC Controller also includes both AC and DC power supply and distribution circuitry. The DC Controller controls the following systems and functions:

Print Engine Control Laser and Scanner Drive Paper Motion Photosensors (Paper Out, Paper Registration, and Paper Exit Power System AC Power Distribution DC Power Distribution Overcurrent/Undervoltage Protection SleepMode High Voltage Power Distribution
Figure 5-2 shows the various DC controller loads.
Figure 5-2

Motor

Sensors)

AC Driver
Low-Voltage Supply
+5V +12V

DC Controller Loads

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Functional Overview

Print Engine Control System
Laser and Scanner Drive
Based on information received from the Formatter, the DC Controller sends signals to the Laser/Scanner Assembly to modulate the laser diode ON and OFF and to drive the Laser/Scanner motor. Refer to "Image Formation System," later in this chapter for more information.

Paper Motion Monitoring and Control
The DC Controller PCA controls paper motion by continuously monitoring the various paper sensors and coordinating the timing with the other print processes. For a detailed explanation of paper movement, and the interaction of photosensors and solenoid with the paper movement process, refer to the section "Paper Feed System," later in this chapter.

+12 V Shutoff Switch
The 12 volt DC power shutoff switch, Switch 101, located on the top of the printer, is activated by the printer door. The front door must be closed before the printer can resume printing.

Engine Test Switch
The Test Print, Switch 201, located on the DC Controller, is activated manually through an access hole at the front of the printer. This switch causes the print engine to perform a self-test diagnostic which bypasses the Formatter PCA and prints a full page of black vertical lines. This test is useful for troubleshooting printer problems because it isolates the print engine from the Formatter PCA. (See Chapter 7, "Troubleshooting," to learn more about how to perform an engine test.)

Motor
The Motor is controlled by the DC Controller PCA. The Motor provides all of the printer's paper movement.

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Functional Overview

5-5

Power System (on DC Controller PCA)
The AC, DC, and high voltage power supply circuits are all contained within the DC Controller PCA.

AC Power Distribution
The AC power circuitry supplies AC voltage whenever the power cord is connected to the AC power source. AC voltage is distributed to the DC power supply circuitry and to the AC driver circuitry, which controls AC voltage to the fusing assembly's heating element.

DC Power Distribution
The DC power distribution circuitry, located on the DC Controller PCA, distributes +5 V DC and +12 V DC as follows: +5 V DC: Formatter PCA Photosensors DC Controller Circuitry Laser/Beam Detect Circuitry Motor Scanner Motor Solenoid High Voltage Power Supply

+12 V DC:

+12VA DC:

Overcurrent/Overvoltage Protection
There are two overvoltage /overcurrent devices in this printer:

Fuse F101 provides overcurrent protection for the fusing system circuitry. To
check or replace the fuse requires the removal of the DC Controller. Fuse 102 (found only on 110V units) provides overcurrent protection to the printer DC power supply circuitry. In addition, the +12V DC and +5V DC power circuitry contains an overcurrent protection circuit which automatically shuts off the output voltage when an overcurrent condition occurs due to a short or abnormal voltage on the load side.

SleepMode
Instead of a power switch, the printer has a SleepMode function. After the printer has been idle for 15 minutes, it turns itself off by shifting to SleepMode. The front panel lights remain off, and the printer retains all printer settings and downloaded fonts and macros while in SleepMode.

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Functional Overview

The printer exits SleepMode and all of the lights power on when any of the following occur:

A job is received. The Front Panel Button is pressed. The printer front door is opened.
Note

The printer will not enter SleepMode if there is a printer error.

High Voltage Power Distribution
The High Voltage Power Supply PCA applies an overlap of DC and AC voltage to the primary charging roller and the developing roller. This circuit also applies a positive or negative DC voltage to the transfer charging roller according to the instructions from the CPU on the DC Controller PCA. This circuit also controls the image density by changing the primary AC voltage and the developing AC bias according to the setting of the print density dial. High voltage is disabled when the printer's EP Door is open (i.e., switch SW101 is open).

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Functional Overview

5-7

Formatter System
The Formatter PCA is responsible for the following:



Receiving and processing print data from the printer interface. Monitoring Front Panel Button and relaying printer status information. Developing and coordinating data placement and timing with the print engine. Storing font information. Communicating with the host computer through the Bi-Directional Interface. The Formatter PCA receives print data from the Bi-Tronics Interface and converts it into a dot image. The DC Controller synchronizes the Image Formation System with the Paper Feed System and signals the Formatter to send the print image data. The Formatter sends the print image data (dots) in the form of a VIDEO signal and the printing process begins. The Formatter PCA also provides mounting locations for additional memory.

CPU
The Formatter PCA incorporates a Motorola 68030 custom-built microprocessor operating at 24 MHz.

Read Only Memory (ROM)
Besides storing microprocessor control programs, the ROM stores dot patterns of internal character sets (fonts).

Random Access Memory (RAM)
The RAM stores printing and downloaded font information received from the host system and temporarily stores a full page of print image data before the data is sent to the print engine. (See "Page Protect" later in this chapter.) Memory capacity can be increased by adding a DRAM memory card to the Formatter PCA. Note that adding memory may also increase print speed when printing complex graphics.

Parallel Interface
The Formatter PCA receives incoming data through its Bi-Tronics interface. The Bi-Tronics I/O provides high speed and two-way communication between the printer and the host, allowing the user to change printer settings and monitor printer status from the host computer. This interface is IEEE-1284 compliant.

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Functional Overview

Control Panel
Status LED Lights
The Formatter uses three LEDs mounted under the printer cover to communicate printer status to the user. Refer to "Using the Control Panel" in Chapter 3 and "Printer Error Troubleshooting" in Chapter 7 for more information on the lights.

Front Panel Button
The Formatter PCA is connected to a microswitch located on the control panel PCA. The single button is used for such functions as self test, reset, and to display error codes. Refer to "Using the Control Panel" in Chapter 3 for more information on the Front Panel Button.

Resolution Enhancement (REt)
The Formatter PCA contains circuitry for Resolution Enhancement technology (REt), which modifies the standard video dot data on its way to the DC Controller to produce "smoothed" black-to-white boundaries. REt is user-adjustable from some software applications. Available settings are On or Off.

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Functional Overview

5-9

EconoMode
The EconoMode setting uses approximately 50% less toner than standard mode printing by reducing the dot density. However, EconoMode does not extend toner cartridge component life. EconoMode, which can also be thought of as "draft mode," is user-selectable through some software applications. The default setting is Off.
Figure 5-3

EconoMode vs Normal Mode Note

EconoMode does not affect print speed or memory usage.

Memory Enhancement technology (MEt)
The Hewlett-Packard Memory Enhancement technology (Met) effectively doubles the standard memory through a variety of font and data compression methods. MEt is only available in PCL mode and is not customer selectable. When using the host-based driver, your PC handles memory management.

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Functional Overview

Enhanced I/O
The Enhanced I/O feature allows printer memory to be used for storing data received from the host computer. When Enhanced I/O is enabled, you can send more data to your printer in shorter amounts of time, which allows you to return to your application sooner. Enhanced I/O has the following options:

Auto--allows the printer to use Enhanced I/O memory allocation to increase the
speed of data transfer from the host computer to the printer, if necessary. Off--uses the minimum amount of printer memory for storing data sent from the host computer. Enhanced I/O is only available in PCL mode. When using the host-based driver, your PC handles memory management.

Page Protect
Page complexity (rules, complex graphics, or dense text) may exceed the printer's ability to create the page image fast enough to keep pace with the Image Formation process. If Page Protect