HP C2040A, C2005A, 4MP, 4P, C2015A Service Manual

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Combined Service Manual

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HP LaserJet 4L/ 4ML

(C2003A/ C2015A) HP LaserJet 4P/ 4MP (C2005A/ C2040A)

Warranty

The information contained in this document is subject to change without nc,tice.

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 cmtained herein or for incidental or consequential damaged in connecti~m 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.

Conventions

This manual uses the following conventions:

Unless specifically stated otherwise, information applies to all four printer models (LaserJet 4L/4ML/4P/4MP), Most procedures are combined for all printers, except where they differ substantially.

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.

COME’UTER type indicates text as seen on a computer monitor.

Di;W.-ii’+type indicates text as seen on the printer’s 16 character LCD display panel (LaserJet 4P/4MP only).

~ indicates keys on a computer keyboard or on the printer’s control panel (LaserJet 4P/4MP only). Examples include ~ and

,“

21.JII[,!’J

i,,

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.

A detailed matrix of printer features is followed by general information on the four printer models. Specifications, major

assembly locations, safety and regulatory information are all included. The chapter ends with a discussion of the service and repair philosophy along with useful information on obtaining technical help.

Recommendations pertaining to the physical location of the printer and consumables are followed by general print media

specifications (including specifications for paper, envelopes, labels and transparencies).

Chapter 3 provides the step-by-step installation and setup

procedure, along with detailed information on using the Control Panel for each printer model. Sample self tests and printer reset information are also included.

Turn to this chapter for information on routine printer maintenance, including consumables and printer cleaning procedures. Paper jam procedures are also included.

Here you will find the basic theory-of-operation information required to understand the various printer systems and how

they function together.

This chapter contains the step-by-step procedures for replacing all the printer’s field replaceable units (FRUS). Assemblies are grouped by physical location in the printer.

...

Turn to Chapter 7 for diagnosing and troubleshooting printer problems. Start with the general troubleshooting flowchart, referencing the paper path and printer component location diagrams for assistance. Error message tables and image defect samples are followed by engine test and other diagnostic procedures. The chapter ends with more troubleshooting tools such as an image defect ruler and wiring diagram.

I-JseChapter 8 to find any field replaceable unit (FRU) in the printers. Exploded view drawings are accompanied by complete part number and description tables.

The parts index is a convenient tool for looking up any field replaceable unit (FRU). All parts are sorted both by part number and by part name. Parts are cross-referenced to their corresponding exploded view illustrations in Chapter 8.

This appendix contains cabling and pin-out information for the serial, parallel and LocalTalk interfaces which are supported by the printers.

lJse the subject index to quickly locate any information in the manual.

Fig l-l Fig I-2 Fig I-3 Fig I-4 Fig I-5 Fig I-6 Fig 2-1 Fig 2-2 Fig 3-1 Fig 3-2 Fig 3-3 Fig 3-4 Fig 3-5 Fig 3-6 Fig 3-7

Fig 3-8 Fig 4-1 Fig 4-2 Fig 4-3 Fig 4-4 Fig 4-5 Fig 4-6 Fig 4-7 Fig 5-1 Fig 5-2 Fig 5-3 Fig !i-4 Fig 5-5 Fig 5-6 Fig 5-7 Fig 5-8 Fig 5-9 Fig 5-10 Drum Surface Potential --5-24 Fig 5-11 Drum Cleaning – 5-25 Fig 5-12 Primary Charging Roller – 5-26 Fig 5-13 Image Writing – 5-27 Fig 5-14 Image Development – 5-29 Fig 5-15 Developing Potentials – 5-30 Fig 5-16 Transferring Stage – 5-3:1 Fig 5-17 Fusing Film and Pressure Roller – 5-32 Fig 5-18 Printer Paper Path – 5-34 Fig 5-19 Oblique Roller Paper Alignment – 5-37

Sample Model and Serial Number Labels – 1-3 External Assembly Locations (LaserJet 4L/4ML) -1-6 External Assembly Locations (LaserJet 4P/4MP) -1-7 Internal Assembly Locations (all printers) – 1-8 LaserJet 4L Internal Assembly Locations – 1-9 LaserJet 4P Internal Assembly Locations – 1-10 Printer Space Requirements – 2-3 Distributing Toner – 2-6

Attaching the Help Labe”ls (LaserJet 4L/4ML) – 3-6

LaserJet 4L/4ML Front Control Panel – 3-9 LaserJet 4P/4MP Front (;ontrol Panel – 3-12 LaserJet 4P/4MP Menu Map – 3-14 Service Mode Menu Map (LaserJet 4ML/4P/4MP) -3-16 LaserJet 4L Self Test Page – 3-20 LaserJet 4MP Service Mt]de Self Test Page – 3-22

Engine Test Button and Printout (LaserJet 4L) – 3-25

Service Checkpoints – 4-2

Sample 5% Page Coverage – 4-4 Paper Feed Area Jam – 4-9 Clearing Jams from the Toner Cartridge Area – 4-10 Clearing Jams from the l’aper Guide – 4-10 Releasing Paper from the Fusing Assembly – 4-11 Clearing Jams from the Fuser Area – 4-12 Printer Functional Block Diagram – 5-2 DC Controller Loads – 5-3 Top Cover/Toner Cartridge Plunger – 5-6 Power Supply Block Diagram – 5-9 High Voltage Power Timing – 5-11 Formatter Block Diagram – 5-12 EconoMode vs. Regular F’rint – 5-18 Image Formation Block Diagram – 5-22 Photosensitive Drum – 5-23

Fig 6-1 Fig 6-2 Fig 6-3 Fig 6-4 Fig 6-5 Fig 6-6 Fig 6-7 Fig 6-8 Fig 6-9 Fig 6-10 Fig 6-11 Fig 6-12 Fig 6-13 Fig 6-14 Fig 6-15 Fig 6-16 Fig 6-17 Fig 6-18 Fig 6-19 Fig 6-20 Fig 6-21 Fig 6-22 Fig 6-23 Fig 6-24

Fig 6-25 Fig 6-26 Fig 6-27 Fig 6-28 Fig 6-29 Fig 6-30 Fig 6-31 Fig 6-32 Fig 6-33 Fig 6-34 Fig 6-35 Fig 6-36 Fig 6-37 Fig 6-38 Fig 6-39 Fig 6-40 Fig 6-41

Fig 6-42 Fig 6-43 Pickup Feed Roller Assembly (bottom view) – 6-48 Fig 6-44 Feeder Guide Assembly – 6-49 Fig 6-45 Small Media Roller Assembly – 6-50 Fig 6-46 Static Eliminator Strip – 6-51 Fig 6-47 Toner Cartridge Lever Assembly – 6-52 Fig 6-48 Top Cover Switch {Plunger Assembly) -6-53 Fig 6-49 Releasing the Side Tabs – 6-.54

Phillips vs. Posidriv Screwdrivers – 6-3 Memory Module (LaserJet 4L) – 6-4 SIMM Access Panel (LaserJet 4P/4MP) – 6-5 Power Access Door (LaserJet 4L/4ML) – 6-6 Printer Cover Screws (Laser,Jet 4L/4ML) – 6-7 Releasing the Printer Cover Rear Tabs – 6-8 Control Panel Connector (LaserJet 4P/4MP) – 6-9 Printer Cover Screws (Laser, Jet 4P/4MP) – 6-10 Cover (LaserJet 4P/4MP) – 6-11 Rear Door – 6-12 Control Panel Assembly (LaserJet 4P/4MP) -6-13 Control Panel RFI Shield (LaserJet 4P/4MP) -6-14 Formatter Shield and PCA – 6-15 DC Controller Connector& Switch Actuator – 6-16 Gear Train Assembly – 6-17

Screw Tightening Sequence Example – 6-18 Main Motor – 6-19 Oblique Roller Assembly – 6-20 Tray Forms Size Guide – 6-21 Paper Cassette Assemblies – 6-22 Laser/Scanner Assembly – 6-23 Fan – 6-24 Power Switch Assembly (LaserJet 4P/4MP) – 6-25 Paper Guide/Roller Assembly – 6-26

Transfer Roller -6-27 Beam-to-Drum Mirror – 6-29 Fusing Assembly – 6-30 Fusing Pressure Plate – 6-31 Upper Fusing Assembly – 6-32 Fuser Delivery Assembly – 6-33 Lower Delivery Roller – 6-34 Lower Delivery Guide and Exit Sensor Flag – 6-35 Fuser Connector Assembly – 6-36 Upper Output Roller Assembly – 6-37 Lower Output Rollers – 6-38 DC Controller Assembly – 6-40

Pickup Feed Roller Solenoid – 6-41

Machine Screw Locations (DC Controller PCA) – 6-43 Metal Backing Plate – 6-44 DC Controller PCA – 6-45 D-Roller – 6-46

Pickup Feed Roller Assembly (side view) – 6-47

Fig 6-50 DC Controller/Scanner Connector Location – 6-55 Fig 6-51 Input Paper Sensor Arm -6-56 Fig 7-1 Paper Path and Components – 7-4 Fig 7-2 DC Controller PCA Components – 7-5 Fig 7-3 Top Door/T’oner Cartridge Plunger Assembly – 7-9 Fig 7-4 Engine Test Button and Printout (LJet 4L/4ML) -7-36 Fig 7-5 Defeating the Top Door Plunger (LJet 4P/4MP) – 7-37 Fig 7-6 Defeating the Exit Sensor Flag (LaserJet 4P/4MP) – 7-38 Fig 7-7 Leading Edge Adjustment – 7-43 Fig 7-8 Beam -to-Dru]m Mirror Adjustment – 7-45 Fig 7-9 Repetitive Image Defect Ruler – 7-46 Fig 7-10 Main Wiring Diagram – 7-47 Fig 8-1 Assembly Locations – 8-7 Fig 8-2 Covers and Doors (LaserJet 4L/4ML) – 8-8 Fig 8-3 Covers and Doors (LaserJet 4P/4MP) – 8-10 Fig 8-4 Internal Components 1 – 8-12 Fig 8-5 Internal Components 2 – 8-14 Fig 8-6 Internal Components 3 – 8-16 Fig 8-7 DC Controller Assembly – 8-18 Fig 8-8 Gear Train Plate Assembly – 8-20 Fig 8-9 Paper Cassette (LaserJet 4L/4ML) – 8-21 Fig 8-10 Paper Cassette (LaserJet 4P/4MP) – 8-22 Fig 8-11 Pickup Assemb] y – 8-23 Fig 8-12 Fuser Assembly – 8-24 Fig 8-13 Keyboard Overlay (LaserJet 4P/4MP) – 8-26 Fig B-1 Parallel Cable Pin Assignments – B-2 Fig B-2 Serial Pin-outs DB-25 to DB-9 – B-3 Fig B-3 Serial Pin-outs DB-9 to DB-9 – B-3 Fig B-4 Connecting to END of a LocalTalk Network – B-4 Fig B-5 Connecting to MIDDLE of a LocalTalk Network – B-5

Tbl 1-1 Tbl 1-2 Tbl 1-3 Tbl 1-4 Tbl 1-5 Tbl 2-1 Tbl 2-2 Tbl 2-3 Tbl 2-4 Tbl 2-5 Tbl 2-6 Tbl 2-7 Tbl 2-8 Tbl 3-1 Tbl 3-2 Tbl 4-1 Tbl 4-2 Tbl 5-1 Tbl 5-2 Tbl 5-3 Tbl 7-1 Tbl 7-2 Tbl 7-3 Tbl 7-4 Tbl 7-5 Tbl ‘7-6 Tbl 7-7 Tbl ‘7-8 Tbl 7-9 Tbl 7-10 Scanner Error --7-13 Tbl 7-11 WROM Error – 7-14 Tbl 7-12 Engine Error – 7-15 Tbl ‘7-13 Main Motor Error – 7-15 Tbl 7-14 Fan Error – 7-16 Tbl 7-15 Formatter Error – 7-16 Tbl 7-16 NVRAM Error – 7-17 Tbl 7-17 Blank Display – 7-17 Tbl 7-18 Blank (White) Page – 7-24 Tbl 7-19 Black Page -7-25 Tbl 7-20 Faded Print -7-26 Tbl 7-21 Vertical White Stripes – 7-27 Tbl 7-22 Vertical Black I.ines – 7-28 Tbl 7-23 Horizontal Black Lines – 7-28

Printer Dimensions – 1-4 Performance Specifications -1-4 Environmental Specifications – 1-5 Electrical Specifications – 1-5

Related Documentation – 1-19 Current Requirements (Amps) – 2-2

Printer Operating Dimensions – 2-3

Toner Cartridge Environmental Conditions – 2-4

Supported Media Sizes – 2-!3 Selected Paper Specifications – 2-11

Envelope Speciilcations–212 Adhesive Label Specifications – 2-14 Transparency Specifications – 2-15

Front Panel Button Usage --3-11

Menu of Resets (LaserJet 4“P/4MP) – 3-27

Life Expectancy of Consumi~bles – 4-3 Cleaning Printer Components – 4-6 Solenoids – 5-35 Photosensors – 5-35 Print Period Descriptions – 5-40 Paper Out Error -7-7 Paper Jam Error – 7-8 Door Open Error – 7-9 Memory Error – 7-10 Manual Feed – 7-10 Service Error -7-11 Fuser Error --7-12 Fuser Checks – 7-12 Beam Error – 7-13

. .

Tbl 7-24 Repetitive Defects – 7-29 Tbl 7-25 Staining -7-30 Tb”l 7-26 Dropout – 7-31 Tbl 7-27 Character Voids – 7-31 Tbl 7-28 Background Scatter – 7-32 Tbl 7-29 Bottom Portion of Page Blank – 7-32 Tbl 7-30 Faulty Registration – 7-33 Tbl 7-31 Smeared Print – 7-34 Tbl 7-32 Image Skew – 7-35 Tbl 7-33 Compressed Print – 7-35 Tbl 7-34 High-Voltage System Checks – 7-41 Tbl 7-35 Causes of Paper Curl – 7-42 Tbl 8-1 Fasteners IJsed in the Printer – 8-4 Tbl 8-2 Covers and Doors (LaserJet 4L/4ML only) – 8-9 Tbl 8-3 Covers and Doors (LaserJet 4P/4MP only) – 8-11 Tbl 8-4 Internal Components 1 – 8-13 Tbl 8-5 Internal Components 2 – 8-15 Tbl 8-6 Internal Components 3 – 8-17 Tbl 8-7 DC Controller Assembly – 8-19 Tbl 8-8 Gear Train Plate Assembly – 8-20 Tbl 8-9 Paper Cassette (LaserJet 4L/4ML) -8-21 Tb[ 8-10 Paper Cassette (LaserJet 4P/4MP) -8-22 Tb~ 8-11 Pickup Assembly – 8-23 Tbl 8-12 Fuser Assembly -8-25 Tb\ 8-13 Keyboard Overlays (Laser,Jet 4P/4MP) – 8-26

Chapter Contents

Product Information Printer Features – 1-2

Identification – 1-3

Model and Serial Numbers – 1-3 Specifications – 1-4 Product Overview – 1-6

External Assembly Locations (LaserJet 4L/4ML) – 1-6

External Assembly Locations (LaserJet 4P/4MP) – 1-7

Internal Assembly Locations – 1-8 Safety Information – 1-11

Laser Safety – 1-11

Laser Statement (Finland) – 1-12

Declaration of Conformity – 1-13

Toner Safety – 1-14

MSDS Information – 1-14 By mail: – 1-14 By fax: – 1-14

Ozone Emission – 1-14 FCC Statement (Class B) – 1-15 VCCI Statement (Japan) – 1-16 Service Approach – 1-17

Exchange Program – 1-17 Ordering Parts – 1-17 Ordering Consumables – 1-17

Ordering Related Documentation – 1-18

Print Utilities – 1-19

Technical Assistance – 1-20

HP ASAP 1-800-333-1917 (U.S.) – 1-20 HP FIRST -1-20

HP FIRST, U.S. – 1-20 HP FIRST, Europe – 1-20

HP AUDIO-TIPS – 1-21 HP CompuServe Forum – 1-21 Customer Information Centers – 1-21 Customer Support Center (Assist Line) – 1-21 European Customer Support Center – 1-22 Other Areas – 1-22 ‘

Chapter 1

Contents Page 1

CI!-mpttwcamtemrts

2 Q@a=ating Rmq@7mflmmfx

Site Requirements – 2-2

Operating Environment – 2-2 Printer Space Requirements – 2-3

The HP 92274A Toner Cartridge – 2-4

Storage Conditions – 2-4

Storing Opened Toner Cartridges – 2-5 Toner Cartridge Handling Suggestions – 2-6 Refilled Toner Cartridges – 2-7 Recycling Toner Cartridges – 2-7

Media Specifications – 2-8

Media Sizes Supported – 2-9 Media Selection Guidelines – 2-10 Envelope Specifications – 2-12

Adhesive Label Specifications – 2-13 Transparency Specifications – 2-15 Storing Print Media – 2-16 Shipping Print Media – 2-16

Chapter 2

Contents Page 1

0&@x5w’ Q3mr&?mts

hs’tdktimoi and Cmfigmlmtilm

Unpacking and Installation – 3-2

A. Choose the best location. – 3-2

B. Unpack the printer. – 3-2 C. Check package contents. – 3-3

D. Install the toner cartridge. – 3-3 E. Load the paper cassette. – 3-4 F. Attach the interface cable(s). – 3-4

G. Attach the power cord. – 3-5 H. Attach the Help Labels (Lase’Jet 4L/4ML only) – 3-6 I. Install Printer Drivers and Utilities (optional) – 3-7

How to Obtain Printer Drivers – 3-7 Using the Printing Software Package – 3-8

Using the Control Panel – 3-9

LaserJet 4L/4ML Control Panel Overview – 3-9

The LaserJet 4L/4ML Lights – 3-10 The LaserJet 4L/4ML Front Panel Button – 3-11

LaserJet 4P/4MP Control Panel Overview – 3-12

LaserJet 4P/4MP Control Panel Display and Lights – 3-13

Service Mode (LaserJet 4ML/4P/4MP) – 3-15

LaserJet 4ML – 3-15 LaserJet 4P/4MP – 3-15 Setting the Page Count (LaserJet 4P/4MP) -3-17 Setting the Cold Reset Default (LaserJet 4P/4MP) -3-18 Other Service Mode Items – 3-18

Printing a Self Test – 3-19

LaserJet 4L/4ML: – 3-19 LaserJet 4P/4MP: – 3-19 The LaserJet 4L Self Test Fields – 3-21 The LaserJet 4ML/4P/4MP Self Test Fields – 3-23 Continuous Self Test – 3-24 LaserJet 4L/4ML: – 3-24 LaserJet 4P/4MP: – 3-24

Engine Test – 3-25

(continued on back)

Chapter 3

Contents Page 1

Resetting the Printer – 3-26

LaserJet 41J4ML:– 3-26 LaserJet 4P/4MP: – 3-26

Simple Reset – 3-26 The Menu of Resets – 3-27

The Cold Reset (LaserJet 4ML/4P/4MP) – 3-28

LaserJet 4ML: – 3-28 LaserJet 4P14MP:– 3-28

PJL Software Commands – 3-29

Contents Page 2 Chapter 3

chapter CkDntc?nts

4 Maintenancx2

Service Checkpoints – 4-2 Life Expectancy of Consumables – 4-3

Toner Cartridge Life –

Saving Toner with EconoMode – 4-5

Cleaning Printer Components – 4-6

Cleaning Spilled Toner – 4-7

(leafing Paper Jams – 4-8

Paper Jams in the Paper Feed Area – 4-9 Paper Jams Inside The Printer – 4-10 Paper Jams in the Paper Output Area – 4-12

4-4

Chapter 4 Contents Page 1

Chapter Contents

5 Functional Overview

Basic Printer Functions – 5-2 DC Controller/Power System – 5-3

Print Engine Control – 5-5

Laser and Scanner Drive – 5-5 Paper Motion Monitoring and Control – 5-5 Top Door/Toner Cartridge Microswitch (SW201) – 5-6 Engine Test MicrosWitch (SW301) -5-7 Motors – 5-7

Power System (on DC Controller PCA) – 5-8

AC Power Distribution – 5-8 DC Power Distribution – 5-8 Overcurrent/Overvoltage Protection – 5-10 Intelligent ON/OFF (LaserJet 41J4ML only) – 5-10 High Voltage Power Distribution – 5-11

Formatter System – 5-12

CPU – 5-13 Read Only Memory (ROM) -5-13 Random Access Memory (RAM) -5-13 Non-Volatile Memory (NVRAM) – 5-14 Parallel Interface – 5-14

High Speed (Yes/No) – 5-14 Advanced Functions (On/Off) – 5-14

Serial I/O (LaserJet 4P/4MP) -5-15

Pacing (Serial Modes of Operation) – 5-15 LocalTalk I/O (LaserJet 4ML/4MP) – 5-15 Control Panel – 5-16

LaserJet 4L/4ML – 5-16

LaserJet 4P/4MP – 5-16 Resolution Enhancement (REt) – 5-17 Print Density Adjustment – 5-17 EconoMode – 5-18 Memory Management – 5-19

Memory Enhancement technology (MEt) – 5-19

Image Adapt (LaserJet 4L/4ML) – 5-20

Page Protect – 5-20

PJL Overview – 5-21

(continued on back)

Chapter 5

Contents Page 1

Image Formation System – 5-22

Photosensitive Drum – 5-23

Drum Sensitivity – 5-24

Cleaning Stage – 5-25 Conditioning Stage – 5-26 Writing Stage – 5-27 Developing Stage – 5-29 Transferring Stage – 5-31 Fusing Stage – 5-32

Paper Feed System – 5-33

Paper Movement Overview – 5-34 Solenoids – 5-35 Photosensors – 5-35

Paper Out Sensor (PS2) – 5-35 Input Paper Sensor (PS1) – 5-36

Printing from the Paper Cassette – 5-37 Manual Feed Printing – 5-38 Small Media Rollers (LaserJet 4P/4MP) – 5-38 Paper Jam Detection – 5-39

Power-On Jams – 5-39 Pickup Jams – 5-39 Delay Jams – 5-39

Basic Sequence of Operation – 5-40

Standard Printer Operation – 5-40

General Timing Diagram – 5-41

Contents Page 2

Chapter 5

Cx’-?.apbfckmiw?i’Nts

JRmmKmd and W@wmnm?nt

Removal and Replacement Strategy – 6-2 Required Tools – 6-3 User Installable Assemblies – 6-4

Memory Upgrade (LaserJet 4L) – 6-4 Memory/Language SIMMS(LaserJet 4P/4MP) – 6-5

Cover and Doors – 6-6

Power, I/O and Memory Doors (LaserJet 41J4ML) -6-6 Printer Cover (LaserJet 4L/4ML) -6-7 Printer Cover (LaserJet 4P/4MP) -6-9 Rear Door – 6-12 Control Panel (LaserJet 4P/4MP) ~ 6-13

Left Side Assemblies – 6-15

Formatter Shield and PCA – 6-15 Gear Train Assembly – 6-17 Main Motor – 6-19

Front Assemblies – 6-20

Front Oblique Roller Assembly – 6-20 Paper Cassette Assembly – 6-21

Tray Forms Size Guide (LaserJet 4L/4ML) -6-21 Compression Springs – 6-22

Internal Assemblies – 6-23

Laser/Scanner Assembly – 6-23 Fan – 6-24 Power Switch Assembly (LaserJet 4P/4MP only) -6-25 Paper Guide/Top Oblique Roller Assembly – 6-26 Transfer Roller and Guide – 6-27

Transfer Roller Bushings – 6-28

Beam-to-Drum Mirror Assembly – 6-29

‘1

(continued on back)

Chapter 6

Contents Page 1

Rear Assemblies – 6-30

Fusing Assembly – 6-30 Fusing Assembly Components – 6-31

Pressure Plate – 6-31 Upper Fusing Assembly

(Teflon Sleeve and Heater Element) -6-32 Pressure Roller – 6-33 Delivery Assembly – 6-33 Lower Delivery Roller – 6-34 Lower Delivery GuidelExit Sensor Flag – 6-35 Connector Assembly (Fuser Entrance Guide) – 6-36

Upper Output Roller Assembly – 6-37 Lower Output Rollers – 6-38

Bottom Assemblies – 6-39

DC Controller Assembly – 6-39 Pickup Solenoid (SL2) – 6-41 DC Controller Fuses – 6-42 High Voltage Connector Assembly – 6-42 DC Controller PCA – 6-43 Pickup Feed D-Roller – 6-46 Pickup Assembly – 6-47 Feeder Guide Assembly and High Voltage Shield – 6-49 Small Media Roller Assembly (LaserJet 4P/4MP) -6-50 Static Eliminator Strip Assembly – 6-51 Toner Cartridge Lever Assembly – 6-52 Top Door Switch (Plunger Assembly) – 6-53 DC Controller/Scanner Connector Assembly -6-54 PS1 Input Paper Sensor Arm – 6-56

Contents Page 2

Chapter 6

... -’

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Troubleshooting Flowchart – 7-2

Paper Path and Components – 7-4 DC Controller Diagram – 7-5 Printer Error Troubleshooting – 7-6

LaserJet 4L/4ML: – 7-6

LaserJet 4P/4MP: – 7-6 Priority of Errors – 7-7 Recoverable Errors – 7-7

Service Errors – 7-11

LaserJet 4L/4ML – 7-11 LaserJet 4P/4MP – 7-11

Clearable Warnings (LaserJet 4P/4MP) – 7-18

Image Formation Troubleshooting – 7-19 Engine Test – 7-36

Engine Test Button Location – 7-36 Printing an Engine Test - LaserJet 4L/4ML – 7-36 Printing an Engine Test - LaserJet 4P/4MP – 7-37

Half Self Test Functional Check – 7-39 Drum Rotation Functional Check – 7-40 High-Voltage Power Supply Check – 7-41 Paper Curl – 7-42 Adjustment Procedures – 7-43

Leading Edge Adjustment – 7-43 Beam-to-Drum Mirror Adjustment – 7-44

Troubleshooting Tools – 7-46

Repetitive Image Defect Ruler – 7-46

Main Wiring Diagram – 7-47

Chapter 7

Contents Page 1

Chapter Contents

$ Parts and Diagrams

How to Use the Part Lists and Diagrams – 8-2

Orderhw Parts – 8-2

Orderin~ Consumables – 8-3 Common Hardware – 8-4 Accessories and Supplies -8-5 Assembly Locations -8-7 Covers and Doors (LaserJet 4L/4ML) -8-8 Covers and Doors (LaserJet 4P/4MP) -8-10 Internal Components 1 – 8-12 Internal Components 2 – 8-14 Internal Components 3-8-16 DC Controller Assembly – 8-18 Gear Train Plate Assembly -8-20 Paper Cassette (LaserJet 4L/4ML) – 8-21 Paper Cassette (LaserJet 4P/4MP) – 8-22 Pickup Assembly – 8-23 Fuser Assembly -8-24 Keyboard Overlay (LaserJet 4P/4MP) – 8-26

Chapter 8

Contents Page 1

AppendixA

Parts Index

Appendk B

170IMorrnation

Product Itiormation

Product Information

Printer Features

Features

Print Speed

Text &Graphics Resolution 300 dpi;

Printer Language

Stsndard Enhanced PCL5

Optionat

Monthly Usage (pages)

Output Tray Capacity I 50 50

LaserJet 4L

(C2003A)

I 4ppm

@JS

Res Enhancement

technology (REt)

None

I Upto6000

Standard Interfaces Parallel (13-tronics)

LsaarJet 4ML

(C2015A)

300 dpi;plus Res Enhancement technology (REt)

Enhanced PCL 5 PostScript Level 2 None

UP tO 8000

45 PCL, 35 PS

Parallel (8i-tronics) LocalTalk

600 dpi;plus 600dpi;

Res Enhancement technology (REt)

Enhanced PCL 5 Enhanced PCL 5 PS L2 (with SIMM

+4 Mb opt memory)’

up to 8000 UPto8000

plus Res Enhancement technology (REt)

PostScript Level 2 None

=--l=-

Setial (9 pin) Serial (9 pin) Parallel (8i-tronics) Parallel (!3-tronics)

LocalTalk

Power Control

EconoMode (toner saving)

Min. Paper Size (using flat paper path)

1bteligentC)n/Ofl

Yes

3 x6.75inch (76x 171mm)

See“Accessories&Supplies”in Cha

Intelligent On/Ofl I Power switch lF’owerswitch I

ter

8 foroptionproductnumbers.

2PrintermemoryisoptimizedwithMemoryEnhancementTechnology(MEt).

Product Information

Identification

Model and Serial Numbers

The model number and serial numbers are listed on identification labels located on the rear of the printer. The model number is

alphanumeric, such as C2003A for the HP LaserJet 4L.

The serial number contains information about the Country of

Origin, the Revision Level, the Production Code, and production

number of the printer.

The rear labels also contain power rating and regulatory information as shown in Figure 1-1.

Figure 1-1

Sample Model and Serial Number Labels

Product Information

Specifications

Table 1-1

Width Depth Heiaht 116.5 cm (6.5 in.) 118 cm (7 in.)

Table 1-2 Performance Specifications

Print Speed * Up to 4 pages per minute Monthly Usage (Duty Cycle) Life Expectancy of toner cartridge** Approximately 3000 pages

IFirst Print lApproximately 34 seconds

*Actual speed depends on data complexity and software handling efficiency. **Toner

Printer Dimensions

Dimension

CATEGORY

Cartridge life can be extended by using EconoMocle.

LaserJet 4L/4ML LaserJet 4P/4MP

(C2003A/C2015A) (C2005A/C2040A)

36 cm (14,25 in.)

137 cm (14.5 in.) 139 cm (15.5 in.)

, 1

Up to 8000 pages

40 cm (15.75

SPECIFICATION

in.)

Product Information Specifications

Table 1-4

Electrical Specifications

VOLTS FREQ

120 Vact10% 100 Vac ? 10%

220 Vac f 1O%

240Vac k 10%

*Operating current requirements.

Table 1-3

50/60 Hz k 2 Hz

50/60 Hz? 2 Hz

50/60 Hz+ 2 tiz

50/60 Hz k 2 Hz

Environmental Specifications

Operating Environment

Storage Environment

(not including toner cartridge) Acoustic Emissions Operation position (per ISO 9296,

DIN 45635,T.1 9):

Printing

Standby

LPA dB(A)

LPAdB(A)

Bystander 1m (per ISO 7779, DIN 45635,T.1 9):

Printing

LPA dB(A)

Standby LPA dB(A)

Sound Power (per ISO 9296):

Printing

Standby

LPA dB(A) LPA dB(A)

WATTS (typical)

AMPS*

4L14ML I 4P14MP

“

‘temperature: 10° C to 32.5° C (50° F to90.5° F) Iumidity: 20-80% (no condensation)

‘temperature: -20° to 60° C (-4° to 140”F) Iumidity: 15-90% (no condensation)

<48 <22

<45 <22

<5.9 <3.5

<49 <33

<46

<30

<6.0 <4.4

4ML

<51 <22

<47 <22

<6.1 <3.6

4MP

<49 <31

<46 <29

<6.0 <4,4

Product Information

Product Overview

External Assembly Locations (LaserJet 4L/4ML)

Figure 1-2

External Assembly Locations, Laserdef 4L/4ML

Product Information Product Overview

External Assembly Locations (LaserJet 4P/4MP)

Product Information Product Overview

Internal Assembly Locations

Figure 1.4 Internal Assembly Locations (all printers)

1, Face-Down Output Rollers

2. Upper Fusing Assembly

3. Laser/Scanner Assembly

4. Primary Charging Roller

5. Beam-to-Drum Mirror

6. Developing Cylinder

7. Toner Cartridge

8. Registration Roller

9. Oblique Rollers

10, Pickup Feed D-Roller

11. Transfer Roller Assembly

12, Photosensitive Drum

13. DC Controller PCA

14. Paper Cassette

15. Fusing Pressure Roller

16. Face-up Delivery Roller

17. Face-Up/Face-Down Deflector

Product Information Product Overview

Fim.me 1-5 shows the location of assemblies visible from the ton of th; LaserJet 4L printer with the printer cover removed. ‘

~lgure 1-5 LaserJet 4L Internal Assembly Locations

1. Transfer Roller 8. Fusing Assembly

2. Paper Guide/Top Oblique Roller 9. Lower Output Rollers (Face-Down)

3. Front Oblique Roller 4, Switch Actuator

5. Formatter PCA

6. Main Motor

10. Upper Output Rollers (Face-Down)

11. Fan (FM1)

12. Beam-to-Drum Mirror

13. Laser/Scanner Assembly

7. Gear Train Assembly

Product Information Product Overview

Figure 1-6 shows the location of assemblies visible from the top of the LaserJet 4P printer with the printer cover removed.

Figure 1-6 LaserJet 4P Internal Assembly Locations

1. Transfer Roller

9. Fusing Assembly

2. Paper Guideflop Oblique Roller 10. Lower Output Rollers (Face-Down)

3. Front Oblique Roller 11. Upper Output Rollers (Face-Down)

4. Cartridge Bracket 12. Fan (FM1)

5. Formatter PCA

6. SIMM Slots (3) 7, Main Motor

13. Power Switch (not shown) 14, Beam-to-Drum Mirror 15, Laser/Scanner Assembly

8. Gear Train Assembly

Product Information Safety Information

Safety Information

Laser Safety

The Center for Devices and Radiological Health (CDRH) of the U.S. Food and Drug Administration implemented regulations for laser products manufactured since August 1, 1976. Compliance is mandatory for products marketed in the United States.

This printer is certified as a “Class 1“ laser product under the U.S. Department of Health and Human Services (DHHS) Radiation Performance Standard according to the Radiation Control for Health and Safety Act of 1968. Since radiation emitted inside this printer is completely confined within protective housings and external covers, the laser beam cannot escape during any phase of normal user operation.

Never operate or service the printer with the protective cover removed from the Laser/Scanner Assembly. The reflected beam, although invisible, can damage your eyes.

1-11

Product Information

Safety Information

Laser Statement (Finland)

The following applies to printer operation and servicing in Finland.

LASERTURVALLISUUS

LUOKAN

1 LASERLAITE

KLASS1LASERAPPARAT

HPLaserJet(s)4L,4ML,

luokan 1 laeerlaite. Normaalissa kaytossa kirjoittimen suojakotelointi estaa lasersateen paasyn laitteen ulkopuolelle.

Kirjoittimen on hyvaksynyt Suomessa laserturvallisuuden osalta Stikotarkastuskeskus. Laitteen turvallisuusluokka on maaritetty valtioneuvoston paatoksen N:o 472/1985 ja standardin EN 60825 (1991)

4P &. 4MP Iaserkirjoitin on kayttajan kannalta turvallinen

mukaisesti.

VAROITUS ! Laitteenkayttaminenmuullakuinkayttoohjeessamainitullatavalla

saattaaaltistaakayttajanturvallisuusluokan

lasersateilylle.

1 ylittavalle nakymattomalle

VARNING! Omapparatenanvandspaannatsattw ibruksanvisning

specificerats,kananvandarenutsattasforosynliglaserstr~lning,somoverskrider

griinsenforlaserklass1.

HUOLTOHPLaserJet(s)4L,4ML,4P&4MP-kirjoittimensisalliieiolekayttajan huollettavissaoleviakohteita.Laitteensaaavataja huoltaaainoastaansen huoltamiseenkoulutettuhenkilo.Tallaiseksihuoltotoimenpiteeksieikatsota variainekasetinvaihtamista,paperiradanpuhdistustataimuitakayttajiin kasikirjassalueteltuja,kayttajantehtavaksitarkoitettujayllapitotoimia,jotka voidaansuorittaailmanerikoistyokaluja.

VARO ! Mikalikirjoittimensuojakoteloavataan,oletalttiinanakymattomalle lasersateilyllelaitteenollessatoiminnassa.~a katsosateeseen.

VARNING! Omlaserprinternsskyddsholjeoppnasd5.apparatenari fanktion,

utsattasanvandarenforosynliglaserstr~lning.Betraktaejstr?alen.

Tiedotlaitteessakaytettavanlaserdiodinsateilyominaisuuksista:

Aallonpituus777-795nm Teho5mW Luokan

3B laser

Product Information

Safety Information

Declaration of Conformity

According to ISO/IEC Guide 22 and EN 45014:

Manufacturer’s Name:

Manufacturer’s Address:

Hewlett-Packard Company

11311 Chinden Boulevard

Boise, Idaho 83714-1021, USA

declares, that the product

Product Name(s): Model Number(s): Product Options:

LaserJet 4L/4ML/4P/4MP C2003A, C2015A, C2005A, C2040A All

conforms to the following Product Specifications:

Safet~

EN 60950:1988+ A1,A2 IEC 825:1984 + A1:1990 laser class 1

EMC: CISPR-22:1985 / EN 55022:1988 class Bl)

EN 50082-1:1992 IEC 801-2:1991/ prEN55024-2:1992 - 3kV CD, 8 kV AD IEC 801-3:1984/ prEN55024-3:1991 - 3V/m

IEC 801-4:1988/ prEN55024-4: 1992-1 kV Power lines

Supplementary Information: The product herewith complies with the requirements of the Low

Voltage Directive 73/23/EEC and the EMC Directive 89/336/EEC.

1)The product was tested in a typical configuration with

Hewlett-Packard Personal Computer and Test Systems.

Office of Quality Manager Boise, Idaho USA June 15, 1993

European Contact: Your Local Hewlett-Packard Sales and Service OffIce or Hewlett-Packard GmbH, Department ZQ / Standards Europe, Herrenberger

Strae 130, D-7030 Bblingen (FAX + 49-7031-14-3143)

1-13

Product Information

Safety Information

Toner Safety

Note

MSDS Information

A Material Safety Data Sheet (MSDS) for toner or any other

chemical used in the printer is available through Hewlett-Packard’s Customer Information Center by either mail or fax.

By mail:

To obtain an MSDS for the HP 92274A toner cartridges through the mail, call the Customer Information Center (CIC) at

1-800-752-0900 between 6 A.M. and 5 P.M. Pacific Standard Time.

By fax

To obtain an MSDS for the HP 92274A toner cartridges by fax, call HP ASAP (Automated Support Access Program) at 1-800-333-1917 and follow the instructions for using the HP FIRST fax service.

Note

In case of toner spills, skin and clothing are best cleaned by removing as much toner as possible with a dry tissue, then washing with cold water. Hot water causes toner to permanently set into clothing.

See “Technical Assistance” later in this chapter for more information on the HP FIRST service.

Ozone Emission

These printers do not use high voltage corona wires in the electrophotographic process, and therefore generate no measurable ozone gas (03). The printers instead use charging rollers in the toner cartridge and in the print engine.

Product Information

FCC Statement (Class B)

Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the

FCC rules. These limits are designed to provide reasonable

protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause hmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

●

Reorient or relocate the receiving antenna.

●

Increase the separation between the equipment and the receiver.

●

Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

●

Consult the dealer or an experienced radio/TV technician for

help.

Any changes or modifications not expressly approved by

Hewlett-Packard could void the user’s authority to operate this equipment.

Note

Use of a shielded interface cable is required to comply within the Class B limits in Part 15 of FCC rules.

1-15

Product Information

VCCI Statement (Japan)

The VCCI statement below is required in Japan. It is similar to the FCC regulatory statement. -

Product Information Service Approach

Service Approach

Repair of the printer normally begins with use of the printer’s internal diagnostics in conjunction with the troubleshooting procedures in Chapter 7. Once a faulty part is located, repair is accomplished generally by assembly-level replacement of Field Replaceable Units (FRUS). Some mechanical parts maybe repaired at the sub-assembly. PCA component replacement is not supported by HP. Part numbers for all FRUS are located in Chapter 8 of this manual.

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, or Parts Center Europe (PCE).

Ordering Parts

Field replaceable part numbers are found in Chapter 8 of this manual. Replacement parts may be ordered from HP’s Parts Direct Ordering, or Parts Center Europe (PCE). Adresses and phone numbers for both organizations are also found in Chapter 8.

Ordering Consumables

Consumables may be ordered directly from Hewlett-Packard. The phone numbers for ordering consumables are found in Chapter 8.

1-17

Product Information

Service Approach

Ordering Related Documentation

Table 1-5 shows where to order related documentation. Phone numbers for the various sources are:

. PDO (Parts Direct Ordering)

1-S00-227-8164 (U.S. only)

. PCE (Parts Center Europe)

(49 7031) 14-2253.

e HP’s Distribution Center (HPD)

303-353-7650 (U.S.

Ody)

Product Information

Service Approach

Table 1-5 Relaiecl Documentation

DESCRIPTION

PART NUMBER

HP LaserJet Family Quick Reference Service Guide

HP LaserJet 4L User’s Manuall HP LaserJet 4ML User!s Manuali HP LaserJet 4P User’s Manualf HP LaserJet 4MP User% Manual’ HP PCL5 Printer Language Technics/

Reference Information Package HP LaserJet Printer Family Paper

Specifications Guide HP LaserJet 4L Software Solutions Pkg, f HP LaserJet 4ML Windows Solutions Pkg. 1 HP LaserJet 4ML Macintosh Solutions Pkg.1 HP LaserJet 4P Software Packl HP LaserJet 4MP Software Packl’2

Shiu~ed with Drinter. (English version Dart

tra;~lations a;e available --see your loc~l HI

z Includes DOS. Windows and Macintosh solutions.

number is shown

Sales Office.)

5961-0531

C2003-90901 C2015-90901

C2005-90943 C2040-90912

5961-0601

5002-1801

C2003-60122 C201 5-60101 C201 5-60113 C2OO5-6O1O7 C2040-60101

PDO IPCE

x x

;

Other

HPD

x x x

Print Utilities HP provides several utilities for enhancing use of the LaserJet

printers in DOS, MS Windows, and Macintosh environments. More information on specific utilities is included with each of the software packs listed in Table 1-5.

1-19

Product Information

Technical Assistance

HP ASAP 1-800-333-1917 (U. S.)

HP ASAP (Automated Support Access Program) provides free technical support information 24 hours a day, 7 days a week. The ASAP system includes HP FIRST and HP AUDIO-TIPS, both explained below. The ASAP service requires a touch-tone phone.

HP FIRST

HP FIRST (Fax Information Retrieval Support Technology) is a phone-in fax service providing technical information for HP LaserJet users as well as service personnel. Receiving a fax requires a group 3 facsimile machine or fax card. Service-related information includes:

Service notes (HP Authorized dealers). Application notes. Product Data Sheets.

Material Safety Data Sheets (MSDS). Typeface and accessory information. Printer support software information. Toner information. Driver request form and Software Matrix.

HP FIRST, U.S. Call the HP ASAP system (1-800-333-1917) and follow the voice

prompts to enter HP FIRST.

HP FIRST, Europe

Call HP FIRST at one of the following numbers:

U.K., 0800-96-02-71 Netherlands, 06-0222420 Belgium (Dutch), 078-111906 Switzerland (German), 155-1527 Austria, 0660-8128 For English service outside the above countries, (31) 20-681-5792

Germany, 0130-810061

Product Information

Technical Assistance

HP AUDIO-TIPS HP AUDIO-TIPS, available within HP ASAP, is an interactive

voice response system providing pre-recorded answers to the questions most frequently asked by HP LaserJet printer users. Helpful “System Maps” to the HP AUDIO-TIPS recordings are available by fax through HP FIRST.

CompuServe members can download a variety of support materials including product data sheets, software application notes, and printer drivers for many popular software applications. Members may also post and reply to questions in an interactive format. To access the HP Forum, type GO HPPER at any prompt. For more information, or to join CompuServe, call 1-800-524-3388.

Customer Information Centers

For further technical assistance, service-authorized HP and dealer service personnel can contact the nearest Hewlett-Packard Customer Information Center, 1-800-752-0900 in North America.

Customer Support Center (Assist Line)

The HP Customer Support Center, (208-323-2551) is available to answer technical questions regarding setup, configuration, installation and operation of HP printers in the PC and Macintosh environments. The CSC Assist Line is available weekdays from 7AM to 6 PM Mountain Time (Wednesdays until 4 PM).

Questions relating to operating systems such as MS-DOS and UNIX, your network conjuration, or network operating system cannot be answered by the Center and should be referred to your authorized reseller.

1-21

Product Information Technical Assistance

European Customer Support Center

The HP European Customer Support Center, located in

Amsterdam, Holland, is open from 8:30 am to 6:00 pm central

European time (Wednesdays until 4:00 pm). Multilingual customer support representatives can answer technical questions similar to the U.S. CSC, described on the previous page. This service is available at no charge for a period equivalent to the original HP

hardware warranty period.

Each time you call the HP European Customer Support Center, you will be required to provide the printer’s serial number and original date of purchase.

To receive a fax listing the supported languages on a countries’ phone number, call HP FIRST (refer to “HP FIRST,” earlier in this section). You can also call the nearest HP sales and service office to obtain the telephone number for the Center. The Center features automated call-routing technology, so you will receive faster service if calling from a touchtone phone or tone dialer.

Other Areas

Outside of North America and Europe, contact your local HP sales office for assistance in obtaining technical support.

=.~

Operating Requirements

SiteRequirements

Site Requirements

Operating Environment

The environmental specifications listed in the “Specifications” section of Chapter 1 must be maintained to ensure the proper operation of this printer. Consider the following points before installing the printer:

Install in a well-ventilated, dust-free area. (Excess dust or smoke will contaminate the printer’s Beam-to-Drum mirror, affecting print quality. )

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 supply circuitry. Printer current

requirements can be found under “Specifications,” in Chapter 1.

Lighting Flicker: In an effort to reduce energy consumption, the fuser is turned on only when needed during printing. During standby mode, the fuser is not kept warm. When the printer is installed in a home, the instant-on fuser may cause some house lights to flicker when printing. This phenomenon is seen in many instant-on products, such as copiers, and will NOT affect printing, nor will it harm the electrical system in any way.

To reduce a flicker effect, plug the printer into a different outlet that may be on a separate circuit, or try fluorescent lighting. If possible, add to the room’s natural lighting. (Surge suppressers will not prevent flickering lights.)

Install where there is stable temperature and humidity, with no abrupt changes (away from water sources, humidifiers, air conditioners, refrigerators, or other major appliances).

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-l).

Operating Requirements

Site Requirements

Printer Space Requirements

.............

;...................

‘ ~m“~‘1

,.,

,--,’

. . ,------------- ------

F.-. m ---- .

Hgwe z--l

-i-able 2-1 Printer Operating Dimensions

Operating

Dimensions

A (l-m))) El(Dqm) C (Width) D (Rear Dow) I 2 inches (5 cm) E (Height - Top

Door Cqoxw))

wmer space ~equ~remenls

LaserJet 4L/4ML

I 14 inches (35.5cm)

14.5 inches (37 cm)

14.25 inches (36 cm) 15,75 inches (40 cm)

13 inches (33 cm) 14 inches (35 cm)

;..;

-----””----------”?

‘i \

‘,‘,;,

I 15 inches (38 cm)

I 2 inches (5 cm)

-“==4

LaserJet 4P/4MP

15.5 inches (39 cm)

2-3

Operating Requirements

HP 92274A Toner Cartridge

The

The HP 92274A Toner Cartridge

Toner cartridges contain components which 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.

Table 2-2 Toner Cartridge Environmental Conditions

1 1 I

CATEGORY

Operating

Storage -20° to 40° c

I TEMPERATURE I HUMIDITY

10° to 32,Y c

tO85% RH

(50° to 90.5° F)

15 to 90% RH

(-4° to 104° F)

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 2-2.

Note

The expiration date of the toner cartridge is

stamped on the cartridge box. This date allows

for up to 2V2 years after manufacture.

Operating Requirements The 1+ 92274A Toner Cartridge

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:

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).

In a temperature between 10° and 35° C (50° -95° F).

Away from ammonia or other organic solvent fumes.

CAUTION

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.

2-5

Operating Requirements

HP 92274A Toner Cartridge

The

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

●

Do not touch the sutiace of the photosensitive drum in the

cartridge. Protect the drum from light and contamination.

●

Do not disassemble or refill a toner cartridge,

●

Do not expose the cartridge to unnecessary vibrations or shock.

●

Do not expose the photosensitive drum to strong light. White

areas on the page may indicate that the drum has been exposed to light for too long. If white areas appear, stop the printer and wait a few minutes. This process should eliminate most

defective images, If not, the toner cartridge maybe placed in a

dark environment for an extended period of time, which may restore some life to the drum.

●

Never manually rotate the drum, especially in the reverse direction; internal damage and toner spills may result.



2-6

Distributing Toner

●

Operating Requirements

The W 92274.4 Toner Cartridge

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.

Re~airs resultimz from the use of refilled toner cartridges are

no{ covered und& the HP warranty or maintenance contract.

Recycling Toner Cartridges

In order to reduce the amount of plastics and other wastes

entering our landfllls, Hewlett-Packard has established a program for recycling used toner cartridges. Parts that do not wear are re-used in manufacture of new cartridges. Plastic and other materials are recycled. HP pays the shipping costs. In addition, a one dollar donation is shared by the Nature Conservancy and the National Wildlife Federation for each cartridge returned under this program. To join this recycling effort, follow the instructions included inside each toner cartridge box.

2-7

Operating Requirements Media Specifications

Media Specifications

Several types of print media can be used with HP LaserJet printers, provided the media specifications are met, Using media that does not meet the specifications listed in this section may increase the incidence of paper jams, cause premature printer wear, and contribute to repair costs.

Note

It is possible that print media can meet all of the general

specifications listed and still not print satisfactorily because of the printing environment or other variables over which Hewlett-Packard has no control.

Hewlett-Packard neither warrants nor recommends the use of any particular media brand. Properties are subject to change by manufacturers and HP has no control over such changes. The operator should test particular media prior to large purchases.

All media should be stable at the 392° F / 200° C temperatures encountered in the printer’s fusing process.

CAUTION

More detailed media specifications are available in the HP LaserJet Printer Family Paper Specification Guide, part number 5002-1801. To order additional copies, refer to “Ordering Related Documentation” in Chapter 1.

Use ordy media recommended for use in laser printers. Printer damage resulting from use of incompatible media will not be covered by HP warranty or service agreements.

2-8

Operating Requirements Media Specificatkms

Media Sizes Supported

The following media sizes are supported by the printer’s paper cassette and manual feed slot.

-i-able2-3

Minimum size:*

3 x 7.5 in. (76x 190 mm)

3x5in. (76x 127mm) Letter, 8.5 x 11 in. (216x279 mm) Legal, 8.5 x 14 in. (216x 356 mm)

IExec, 7.25 x 10.5 in. (184x 267 mm) I X I X

A4, 210 x 297 mm (8,27 x 11.69 in.) Envelopes:

Com-10, 4.1 x9.5 in. (105 x241 mm)

Monarch, 3.87 x 7.5 in. (98x 191 mm) DL, 110 x220 mm (4.3 x 8.6 in,)

C5, 162x 229 mm (6.4 x 9 in.)

Use the “flat paper path” only (manual feed and rear outpu

“

SupportedMediaS3zes

Sizes

LaserJet 4L/4ML

-1-

X1X

x x

LaserJet 4P/4MP

Universal Manual

Cassette Feed

r r r r

x x x

X1X x

r r

Operating Requirements Media Specifications

Media Selection Guidelines

To achieve the best possible print quality and avoid paper jams, follow these guidelines for selecting paper:

Use only high quality, copier grade paper. Avoid paper with embossed lettering, perforations, or texture that is too smooth or too rough.

Colored paper should be of the same high quality as white photocopy paper. The pigments must withstand the printer’s fusing temperature of 392° F (200° C) for 0.1 second without deterioration. Do not use paper with a colored coating that was added after the paper was produced.

Pre-printed forms must be printed with non-flammable, heat-resistant inks that do not melt, vaporize, or release hazardous emissions when subject to the printer’s approximately 392° F (200° C) fusing temperature for

0.1 second.

Always test a small sample of a new print media before purchasing large quantities.

Give a copy of the table on the next page to your paper vendor to ensure that the paper you purchase meets the specifications for this printer. More detailed specifications are in the HP LaserJet

Printer Family Paper Specification Guide, HP Part No.

5002-1801. (See “Ordering Related Documentation” in Chapter 1.)

Operating Requirements Media Specifications

Basis Weight Paper Cassette: 16 to 28 pound (60 to 105 g/m2).

Manual Feed Slot: 16 to 36 pound (60 to 135 g/m2).*

Finishing Precision

Cut sheet to within 0.3 inch (0.8 mm) of nominal, 0.20°

square. Furnish (Composition) 100% chemical wood pulp and/or cotton fiber. Grain Long grain. Moisture Content

4,7 *I% by weight. Packaging Polylaminated moisture proof ream wrap. Smoothness 100 to 250 (Sheffield)*

LaserJet 4P/4MP only Heavier paper stock, in the range of 36 to 42 pound

(135 to 158 gid) may be used, but must use the “flat paper path” (manual feed, rear output) and have a Sheffield smoothness rating not greater than 180.

~~~~~

The “flat paper patlf (manual feed slot and rear face-up delivery door) is recommended for envelopes, overhead transparencies, and labels.

2-11

Operating Requirements

Media Specifications

Envelope Specifications

Choose envelopes that are well-constructed. They should lay flat and be sharply creased. They should not be wrinkled, nicked, or otherwise damaged. Envelopes with a peel-off adhesive strip, or more than one fold-over flap to seal, must use adhesives

compatible with the heat and pressure of the printer’s fusing process. When printing envelopes, always use the “flat paper path” ~manual feed siot

and the rear face-up delivery door).

CAUTION

TaMe 2-5

Paper Paper used for envelope construction must meet the

Basis Weight Caliper Curl (Pre-printed) Envelopes must lay flat with no more than 0.2 in. (5 mm)

Finishing Envelopes must not have any adhesive exposed to the

Furnish (Composition) 1100% chemical wood pulp and/or cotton fiber. Fusing Compatibility Must not scorch, melt, offset, or release hazardous

Grain Long grain. Moisture Content Smoothness 1100 to 250 (Sheffield)

Envelope Specifications

To prevent severe printer damage, do not use

envelopes having windows, clasps, snaps, or synthetic materials.

requirements in the table under “Media Selection Guidelines.”

20 to 24 pound (75 to 90 g/m2), single thickness

3.3 to 5.5 roils (0.084 to 0.14 mm), single thickness

curl across the entire surface.

printer. They must be folded accurately, within f 0.04”

(1 mm). There must be no more than two thicknesses of paper anywhere along the leading edge. All folds must be well scored and sharply creased, and construction must be tight (not baggy). Envelopes must not be stuck together with excess seam sum.

emissions when heated to 392° F (20V C) for 0.1 second,

4.7 +1% bv weiaht.

Operating Requirements

Specifications

Media

Adhesive Label Specifications

Use the following guidelines when selecting labels:

The top sheet (printing surface) must be of copier quality and provide good toner adhesion.

The carrier sheet (backing sheet) must be compatible with the temperatures and pressure of the fusing process, and must be coated for easy release of the top sheet.

The adhesive must be stable at the 392° F (200° C) temperatures encountered for 0.1 second in the printer’s fusing process, and must not produce emissions that exceed exposure levels or threshold limits established by OSHA and other safety agencies. Adhesives must not come into direct contact with any part of the printer.

Labels must be arranged on the carrier sheet so that any exposed spaces run lengthwise down the sheet. Using label stock with spaces between the horizontal rows of labels can often result in labels peeling off during printing, causing serious

jamming and possible printer damage.

wide selection of suitable labels is available through Hewlett-Packard. A list of available sizes is in the H“PLaserJet Printer Family Paper Specification Guide, HP Part No. 5002-1801.

See Chapter 1 for ordering information, or contact your local authorized HP dealer.

CAUTION -

Do not attempt to print on label sheets after any of the labels have been removed from the sheet. Damage to the printer may result.

2-13

Operating Requirements

Media Specifications

Adhesive Must not be on any external surfaces of the label

before, during or after printing. Label construction and die-cutting must not allow labels to peel off

during transport, printing, or fusing. Caliper Curl

Must not exceed 0.007 in. (0,1 9 mm)

In ream: flat within 0,2 in, (5 mm) Finishing Precision Cut sheet within 0.031 in. (0.79 mm) of nominal

and 0.20° square. Fusing Compatibility

All adhesives, carrier sheets, top sheets, and other

materials used in label construction must be

compatible with the heat and pressure of the fusing

iprocess, Materials must not discolor, melt, offset,

or release hazardous emissions when heated to

392° F (20V C) for 0.1 second, Packaging

Moisture proof wrap to preserve properties.

—

The “flat paper path” (manual feed slot and rear face-up delivery door) is recommended for printing adhesive labels.

Transparency Specifications

Overhead transparencies used in HP LaserJet printers must be

able to withstand the 392° F (200° C) temperatures encountered in the printer’s fusing process for 0.1 second. Suitable transparency film is available through Hewlett-Packard. Refer to Chapter 3 of the HP LaserJet Printer Family Paper Specification Guide, HP Part No. 5002-1801 for details.

Caliper 13.9 to 4.3 roils (0.100 to 0.110 mm) Cutting Angle

Finishing precision Cut sheet to within 0.03 in. (0.8 mm) of nominal

Fusing Compatibility Overhead transparency material must be

The “flat paper pat~ (manual feed slot and rear face-up delivery door) is recommended for printing transparencies.

90° * 0.2°

and t 0.2° of square.

compatible with the heat and pressure of the fusing process. Materials must not discolor, melt, offset material, or release hazardous emissions when heated to 392° F (200° C) for 0,1 second.

2-15

Operating Requirements Media Specifications

Storing Print Media

Follow these guidelines when stacking and storing print media:

Store paper in its ream wrapper until ready to use.

DO NOT store cartons or reams directly on the floo~ place cartons on a pallet or on shelves.

DO NOT store individual reams in a manner that causes them

to curl or warp along the edges.

Re-wrap partially used packages of media before storing.

DO NOT stack more than six cartons on top of each other.

Stack each carton squarely on top of the one underneath.

Stack each carton upright.

DO NOT place anything on top of media, regardless of whether the paper is packaged or unpackaged.

Store envelopes in a protective box to avoid damaging the envelope edges.

Keep stored media away from temperature and humidity extremes.

DO NOT store printed documents in vinyl folders (which may contain plasticizers) or expose the documents to petroleum

based solvents.

Shipping Print Media

When shipping print media through different environments, plastic wrap all cartons on the shipping pallet. When shipping media across bodies of water, wrap individual cartons as well. Packaging must protect the media from physical damage.

Installation and Configuration

Unpacking and Installation

Before unpacking the printer, inspect the shipping container for

signs of physical damage. Since a damaged shipping box is an indication of improper handling during shipping, the printer may also be damaged.

Note

If the shipping container has any sign of damage, unpack and power the printer ON with

the carrier’s agent present. If the printer

appears damaged or fails self test, do not accept it.

A. Choose the best location.

Verify that the printer location meets all requirements listed in

Chapter 2.

B. Unpack the printer.

Remove the power cord, the manuals, and the toner package.

Remove the printer from its box.

Remove the outer packing material from the printer.

Open the printer top door by pressing the door release button

4. on the right side of the printer (see Chapter 1, Figure 1-2 or 1-3

for location).

Pull out the paper cassette.

Remove the packing spacers from the inside of printer (2 on the

6. Transfer Roller) and from the paper cassette (2).

Installation and Configuration Wy3acking and installation

C. Check package contents. Nate

If any of the package contents are missing or damaged, contact your HP dealer immediately.

The package should include the following:

● Printer.

. Power cord. . Software Solutions package.

● User’s Manual.

● Toner cartridge.

Note

D. Install the

Press the top door release button to open its top door.

Remove toner cartridge from its box and cut it open. Save the

Interface cables are sold separately. Refer to Chapter 8 for part numbers.

toner cartridge.

packing materials for possible cartridge storage.

Shake the cartridge vigorously to distribute the toner evenly

3. inside the cartridge (see Figure 2-2 in Chapter 2).

Grasp the toner sealing tape tab on the right side of the cartridge. Pull firmly to remove the strip of sealing tape.

Grasp the plastic cartridge body (not the metal shutter linkage), and slide the cartridge into the printer, pushing it firmly into place. Close the top door.

—

3-3

Installation and Configuration

Llnpacking and Installation

E. Load the paper cassette.

1. Pull out the paper cassette located at the lower front of printer

and load approximately 100 sheets (4L/4ML) or 250 sheets (4P/4MP) of paper. The rear of the stack should fit loosely under the two backstops at the rear of the paper cassette.

2. Insert the front corner of the paper stack under the metal clip at the front of the cassette.

Note

3. Resting the paper cassette on a flat surface, slide it into the

printer.

Failure to insert the paper under the metal clip will cause skewing or paper jams.

F. Attach the interface cable(s).

1. Open the 1/0 Door on the printer’s left rear side (LaserJet

4L/4ML only). Attach the 1/0 cable securely to the printer.

Note

LaserJet 41J4ML: Align the cable with

2. the 1/0 Door.

Attach the I/O cable to the computer.

Failure to attach the cable securely may result in an 1/0 error.

the cable hole and close

Installation and Configuration

LJnpwking and

hsbllattm

G. Attach the power cord.

LaserJet 4L/4ML: Open the Power Door at the right rear of the

printer by pressing on the back end of the door and swinging it outward.

Connect the power cord. On the LaserJet 4P/4MP, turn on the power switch on the right side of the printer.

All front panel lights briefly illuminate, then the green Ready light comes on. (LaserJet 4P/4MP: There is a brief self test period before the Ready and the On Line lights are illuminated and the display reads %3 FZIXW.)

LaserJet 4L/4ML: Align the power cord with the hole at the

rear of the door and close the Power Door.

LaserJet 4L/4ML: Briefly press the front panel button to generate a self test and verify that the printer is working.

LaserJet 4P/4MP: Press the - key, then Menu repeatedly until “%;;;T !%+:!..!appears. Then press _ once to display SZL.FT’zx-~.Press_ to print a self test.

Id ~ J.~ Refer to the section “Printin~ a Self Test.” later

U.JW L=

in this chapter, for a detaile~ description’ of self test information.

~y~~

Power On/OfX The LaserJet 4P/4MP uses a conventional on/off power switch. The LaserJet 4L and 4ML printers do not have a power, switch, but use Intelligent On/Off sensing

instead. (See “Intelligent On/Off in Chapter 5.)

Installation and Configuration

Unpacking and installation

H. Attach the Help Labels (L-erJet 4~4ML onlY)

Packaged with the User’s Manual is a sheet of help labels. These labels explain the meanings of the front control panel lights.

Attach the large help label to the inside of the printer’s top door,

and the small label next to the front panel lights, as shown in Figure 3-1.

Figure 3-1

3-6

Attaching the Help Labels (LaserJet 4L/LMUW

I. Install Printer Drivers and Utilities (optional)

Printer drivers are specialized programs designed to allow specific

software applications to function with the HP LaserJet printers. Printer utilities include such things as the HP Explorer program modules, which enhance the usability of the printer and provide

convenient access to printer features outside of specific software

applications.

How to Obtain Printer Drivers

First, check the software’s printer selection feature to see if the printer is listed among the available printers. If it is not, run the software’s SETUP or INSTALL program to install a “ptinter driver” or “printer file” for the printer.

Here are some ways to obtain printer drivers and Software

Application Notes for HP LaserJet printers:

● Check the Printing Software package to see if it includes a driver ‘

for your software. . Order an updated driver from the software vendor. . Call Hewlett-Packard at 303-353-7650. . Obtain a driver request form by fax through HP FIRST

(call 1-800-333-1917). . Download a driver through CompuServe’s HP Forum. To sign up

for CompuServe, call 1-800-848-8199.

,,.,.., _

J’., .-;

While waiting for a specific HP LaserJet printer driver, you can substitute a similar printer driver (such as a driver for the HP LaserJet III, 111P,or 4 printer), These substitute drivers will allow you to use the printer, but they do not support all of the printer’s features.

Installation and Configuration

Unpacking and k“istallaiion

Using the Printing Software Package

The Printing Software package supplied with the printer provides many useful programs and utilities, including:

Printer drivers for several popular software applications.

Utilities for automatically copying printer drivers onto your hard disk.

Software Application Notes for the above applications.

The HP Explorer utilities, including

. A setup program which installs other HP Explorer modules

and automatically updates the computer’s AUTOEXEC.BAT and CONFIG. SYS files. Use the setup program to add or delete any of HP Explorer’s utilities at any time.

. The HP Explorer Remote Control Panel allows changes to

printer settings from the computer’s screen. It supplements the software’s printer support to permit complete control over the printer’s features.

● The HP Explorer Status Monitor is a “Terminate-and-Stay-

Resident” (TSR) program that automatically displays messages from the printer on the computer’s screen whenever the printer’s status changes.

. The HP Explorer Travel Guide is a guide to the printer’s

features. It also serves as an on-line help utility when using

other HP Explorer modules.

Installation and Configuration L/sing M Cbi’m91 FJWEd

Using the Control Panel

LaserJet 4L/4ML Control Panel Overview

The HP LaserJet 4L/4ML printer’s front control panel consists of 4 status lights and a front panel button situated on top of the printer.

-’ Front Panel

Aw%.. ~

jwe 3-2

LaserJet4L/4ML

Front Ckmtrd Panel

3-9

Installation and Configuration

The LaserJet 4L/4ML Lights

The LED lights provide a quick way to check the printer’s status.

Ready (Green)

STEADY: The printer is ready to print a job from the paper

cassette,

BLINKING: If this light is blinking and the Data light is on steadily,

the printer is receiving or processing data,

Data (Green)

STEADY: [f the Data light is on steadily and the Ready light is blinking, the printer is receiving or processing data. If the Data light and the Ready light are both on steadily, there is unprinted data still in the printer. Briefly press the front panel button to print the remaining data. BLINKING: The printer is in Manual Feed mode, Either insert a sheet of paper into the manual feed slot, or press the front panel button briefly to print from the paper cassette instead.

Paper (Amber)

STEADY: The paper cassette is empty or missing, Add more

paper.

BLINKING: There is a paper jam. Jam locations include the paper cassette, under the toner cartridge, or inside the printer’s rear access door. See Chapter 4 for clearing paper jams.

Error (Amber)

STEADY: The printer’s top door is open or the toner cartridge is

either missing or not installed correctly. To correct the problem, make sure the toner cartridge is installed completely and close the top cover until it snaps shu~ BLINKING: The page is too complex. Press the front panel button to continue printing. There maybe some data loss on the page. Try setting Page Protect to On or Auto in the Printer Memory category of the HP Explorer Remote Control panel. If the page still doesn’t print correctly, you may need to install the optional printer memory.

The LaserJet 4L/4ML Front Panel Button

Depending on what state the printer is in, pressing the front panel button allows for control of printing tasks by either starting or resuming a printer function. Table 3-1 explains front panel button usage.

FUNCTION I

Self Test

Continuous Self Test

Reset

Wake Up Press button for two

Continue Press button for two

ACTION

Press button for two seconds.

Hold down button while powering on printer (4L: about 5 seconds, 4ML: about 15 seconds).

Press button for five seconds or until lights are flashing in sequence.

seconds.

seconds,

Form Feed Press button for two

seconds,

Manual Override seconds.

Service Hold down button to Error Codes

Press button for two

display code.

I Liahts

READY light on briefly.

All lights cycle Prints continuous self tesi through. Release button when DATA light only is on (4ML: all lights on).

Always available except when all memory, including lights are lit (Service Error). downloaded fonts and

All off.

Any recoverable error code (see Chapter 7). printing the iob.

DATA and READY light on steady,

DATA light blinking. print from paper cassette.

All lights on steady.

Prints a Self Test page,

pages. Press the button

to stop printing.

Clears all data from

unprinted data,

macros, Resets printer to factory default settings.

Takes the printer out of Intelligent Off mode.

Allows the printer to recover and continue

Print remaining data in printer memory.

Override manual feed to

Press the button to display service light pattern. Use Chapter 7 to determine the problem and solution.

RESULT

3-11

Installation and Configuration Using the Control F%nei

LaserJet 4P/4MP Control Panel Overview

The HP LaserJet 4P/4MP printer’s front control ~anel consists of a

16 character backlit LCD display, an 8 key contr;l panel, and 4 LED status lights situated on top of the printer.

To access a primary key function (such as On Line, Form Feed, or Menu) just press the appropriate key. To access secondary key functions (Reset, EconoMode and -), use the_ key. For example, to access the “reset” function of the ~ key, press _ and ~ simultaneously.

igure 3-3 LaserJet 41Y4MP Front Control Panel

Installation and Configuration using it%?Cmml

LaserJet 4P/4MP Control Panel Display and Lights

The printer’s control panel has a 16 character backlit LCD message display area and four LED status indicator lights. A

complete list of display panel messages is in Chapter 7. The

following describes the functions of the four lights.

Onfine

Panel

Ready Light

ON STEADY: There are no error conditions detected. The printer

can only receive a print job when this light as well as the On Line light are on. BLINKING: The printer is receiving or processing data. Do not take off line or switch power off until the light stops blinking. OFF: The printer is not ready to print. Check the display panel for a message.

On Line Light

ON STEADY: The printer is ready to receive and process data, BLINKING: The printer is transitioning from the On Line to Off Line status. OFF: The printer is off line (not ready to receive data). Other control panel keys can now be accessed.

l==+

item

Ecw@70dc

I Ir

Form Feed Light

ON STEADY: There is unprinted data still in the print buffer.

Press - to take the printer off line, then press ~ to print the remaining data,

BLINKING: Buffered data is being printed, OFF: No buffered data is in the printer.

EconoMode Light

ON STEADY: EconoMode is on. This reduces the amount of

toner used on the page. NOTE: Software can override this selection, even while the EconoMode light is ON.

OFF: EconoMode is off. To turn EconoMode on, press to take the printer off line, then hold down_ while pressing the EconoMode key.

3-13

Installation and Configuration L!Sing the control Par%!

%yMe 3=4

3-14

Lasel’w 4F/44JwMaw Map

Service Mode (LaserJet 4ML/4P/4MP)

The Service Mode should be used only by authorized service personnel. While in Service Mode, you can:

Print a Service Mode Self Test. Verify and set the Page Count (the page count also is displayed

on the standard self test). Set the Cold Reset Default. (This sets the factory default paper

size to either Letter or A4). Set the Demo Page=True/False. Used to remove the Demo Page

option from the self test menu. Set the Diamostic Functions ON or OFF (for software

developers &e only).

LaserJet 4ML

Since the HP LaserJet 4ML does not have a front control panel, Service Mode is accessible only through software (PJL commands). See “PJL Software Commands” later in this Chapter.

LaserJet 4P/4MP

The following procedure is used to initiate the Service Mode (refer to Figure 3-5).

Hold down the -, ~, and m keys while powering ON the printer, until all lights are illuminated and the Display Window is blank. (If the Display Window reads

,,.,-.: :::ci c ,,,.:..,.,

.,”...... .......,.,., ,,..._:,

Repeat this step until successful.)

Click the ~ key, then the - key. The message

,...,,...,..,,,.,.......

:..,@.:.,,,,

.,.,,,,.,.,,.,,.,-.~. automatically begins a ;j~ ~E!...F:W:!. After several seconds, both Control Panel Indicators turn OFF. (The printer may display ‘~? :R%w~i.![~:.;? if it has not warmed up completely.) After the printer has warmed up and passed the self test,

..-.-..

....L..,......:......... i,!..!,,......

‘-”-””r”’”“’”””“’’-’KY’Kis displayed.

. . ..

at this point, the keys were released too soon.

w..u?:is displayed briefly, then the printer

-... ..

3-15 ‘

Service Mode (laserJet 41fiL/4P~4NP)

To exit the Service Mode press them key.

SERVICEMODE

SERVICEMENU

PAGES

D\AGNOSTICS

Figure 3-5 Service Mode Menu Map (laserJet 4P14MP only)

.—

3-16

Installation and Configuration swill% Mcwie &Sel’&?’i 4MLMFWMP)

Setting the Page Count (LaserJet 4P/4MP)

The page count is stored in the printer’s Non-Volatile Memory. If it is necessary to replace the Formatter PCA, the page count should be reset to the printer’s original page count to reflect the age of the print engine. Use the following procedure to set the page count:

Before removing the old Formatter PCA, print a front panel self test to verify the current page count of the printer, if possible.

Note

If it is not possible to print a self test, try to

verify the page count before replacing the

Formatter PCA by following steps 3 through 5,

below.

After veriffing the page count from the old Formatter PCA, replace it with the new PCA as described in Chapter 6.

Enter the Service Mode as described in this section.

When fi~;~:...$I [:E M[]CEis displayed, press the - key to access

2. the Service Menu.

Press the m key to step through the menu. ~HfiiIS=J@LKYX

3. is displayed.( ~ represents the page count currently stored in the printer’s Non-Volatile Memory. The underlined character denotes the cursor position. )

Press the m key to scroll the cursor to underline the desired

4. digit.

Press the m key to select the correct value.

Press - to store the new value in NVRAM.

Set each digit in the same manner. Press -to return the

7. display to :%%~ICE WXE.

Press _ a second time to exit Service Mode.

—

Q 17

Installation and Configuration service Mode (Laserdet 4MLMPMMP)

Setting the Cold Reset Default (LaserJet 4P/4MP)

The default paper size for Formatter PCAS in Europe is A4. When replacing Formatters whose default is set for A4, set the Customization Variable to A4. When the Customization Variable is set to A4, the Cold Reset procedure will always reset the paper size to A4 (not to Letter).

To set the Customization Variable:

1. Enter the Service Mode as described in this section.

2. Press the - key to access the Service Menu.

3. Press the ~ key to step through the menu until

;-.:;,7

.r:,-,r:_-m-i .:-,-.-:-C;C>,,,.

,-, ~~, ,-.,..l,.L,.L, ,..........

4. Press the ~ key to toggle between Letter and A4 paper.

5. Press the ~ key to save your selection.

ISdisplayed.

6. Press -to return the display to :=ti:..~t’ii tififii:.

7. Press - a second time to exit Service Mode.

Other Service Mode Items

The other Service Menu items, z::!” 2;?!H=: and ~:I:w%:3T I>;= are included for specialized purposes. If either item needs to be changed from the default setting (=%...:s;: and :H%,respectively), the procedure is similar to that used for setting the page count or Cold Reset default, described above.

Printing a Self Test

LaserJet 4L/4ML:

Make sure the Ready light is on, and all other lights are off. (If

necessary, reset the printer. )

Briefly press the front panel button (LaserJet 4ML, see Note

below).

After about 6 seconds, the Data light blinks and the self test

page starts to print (see Figure 3-6). Usually, only one page prints. If fonts or macros have been downloaded, a second page prints.

,,,.:, :*>

LaserJet 4Mh The procedure above prints a “demo page” only on the LaserJet 4ML. To print PCL and PostScript configuration pages on the LaserJet 4ML, press and hold the front panel

button down for at least 10 seconds, until the

Data light is ON and the Ready light is blinking. Five pages will be printed (including font sample

pages).

LaserJet 4P/4MP:

Press - to take the printer offline. The On Line light

goes off and the display reads H’ CFT%...:i?i-.

Press - repeatedly until “T:+T !+%:..:is displayed.

Press m to display :+KL..F‘[::~-~.

Press ~. The display panel reads {;:! ~;;i..~ ‘;>;;T’. After a few minutes a PCL Configuration self test page is printed (see Figure 3-7).

3-19

installation and Configuration Printing a %4$ Tesi

Figure 3-6 shows a self test printout for the LaserJet 4L. It lists al~factory default settings. “

Scalable

Typefaces

Univm’s

Ed —

Un;vers Md It

8d M

Unfwers

Uuiws Md Cd Umiwm EdCd

Umim MdCd,i Utivets M Wh

Af)tlCme Ohre

Aatiaue Olive Bd Antkwe Olive It

Albems Md Albertus XBd Wingdng3rsd%l%~%c

—

●****8****

b******@**

EconoMode

Courier Courier ad courier It Courier Bd It

Letter Gothic Letter W.hi c Bd

Letter Goth]c !t CG Times

CG llmes

CG ?hes it CG ZWnesEd h C’J.A

Univers tvld

Ii!!51

Figure 3-6

HP Explorer

LmR.4m

W L!3TBR

3“

OFF Mmmn.i

Ehhanced PCL 5

Bi-Tronics

RAMs;,.

POW,* P.9gcCmmk o F)rmvm, Datcmdc : 15520927 ~ IWO Adapt Uti CO”tml Errors None

LTo AUIO OFF OFF 0 1

12.0

10.0 EO!.(AN8 C.”rkr

,~~~

~ytc, ~

I-4 /

LaserJet 4L Self Test Page (showing default settings)

Installation and Configuration

Printing a SM Test

The LaserJet 4L Self Test Fields

1. Printer Features List. This area can be used to check for

graphics print quality.

2. Scalable Typeface List. Samples of the printer’s internal scalable typefaces.

hl’a’”a

KVv,w

Paper Handling. Shows the current paper settings.

Print Quality Adjustment. Current settings for print density

Removing ac power returns items 3 through 12

to facto~-default settings (shown in Figure 3-6).

and Resolution Enhancement (REt).

Memory Configuration. Settings for Image Adapt, Page

5. Protection, and Auto Continue.

EconoMode. Setting of this toner-saving feature.

Font Selection. Current default printer font settings.

RAM size. Shows the total amount of installed printer memory, including added optional memory. Use to verify proper memory installation.

Page Count. Shows approximately how many pages have been

printed since the last power on. This value is returned to zero whenever the printer is powered off.

10.Firmware Datecode. Shows the datecode of installed

firmware in YYYYMMDD format.

11.Image Adapt Status. Displays YES if the Image Adapt data

compression feature has been invoked since the last power on.

12.Control Errors. Shows the number of 1/0 or misprint errors

since the last power on.

3-21

Installation and Configuration Pining a sell Test

—..=——

$ERVICE MENU ~ ~20

PAGES

CR PAPER = lF1lER SKIP DEMO = FALSE

!31AGNOSTICS = OFF

Ps E vu

m, P* ,,,s

PMALIE L MENU

HI,” S.EED #lW FI:TNS

= m

= “ES = ON

.—. . . . ..——

PRINTING MENU

COPIES = 3 PAPER - LETTER ::;:NTAT IO!. : :ol POrr$it 1

~ FEm . OFF

JOB MENU

,MEDROT ECT : yJo RESWJTIDM PERSONALV : $~:0 T,“SOUT

SERIAL WI!. U

SFXIAC . R.-232 P,C 1NC = El RIO* mm RAW = 96C+ m POLARITY - nr

Pm ,.”fig m.,,

= ,fDlw

.—-m-......—

PCL MEMU

can mm : : <1..-.1)

FWT WBER PITCH = 10.00 SW SE7 = RCMAM8

WNFIG MEMU

m WARN ~ : AUID cCW ,,, s,,, = 3

TE$T MEW

,,,, ,,,,

Law SELF TEST

PC1 lVPE 11ST

,,, mm PA.f

m. .W, !, m,.,

,.—......

,$ TWf FACE L 1S1

,S DEMO PAGE

Installation and Configuration Printing a Self Test

The LaserJet 4MIJ4P/4MP Self Test Fields

The numbered items below refer to the Service Mode PCL Configuration Self Test Page shown in Figure 3-7.

Menu Selections: Shows the current selections for all Service

menu and user menus in the order that they appear in the control panel display (refer to the Menu Maps, Figures 3-4 and 3-5). Use this information to verify the various menu selections.

PS Menu: Appears on the LaserJet 4P only if the Adobe

2. PostScript SIMM is installed.

LocalTalk Information: LaserJet 4MP only. Lists the

3. cotilgured network name and node identification number.

EconoMode Status: Shows current status, ON or OFF.

Formatter Numbefi Shows the Formatter PCA’S serial

5. number.

RAM Size: Shows how much memory is installed in the

6. printer. 2048 Kbytes is standard. If optional memory has been added, a self test can be used to verify installation.

Page Count: Shows how many pages have been printed over

‘7.

the life of the printer.

Firmware Datecode: Shows the datecode of the installed

8. firmware (in YYYYMMDD format).

Installed Options/Personalities: Lists recognized cartridges

9. and personalities. Use to verify installation.

10.REt Status: Shows the current Resolution Enhancement setting, LIGHT, MEDIUM, DARK or OFF. (Default is

MEDIUM.)

11.Sample Printi Shows ripple print pattern (always in Courier).

This area is useful for checking print density and quality.

3-23

Installation and Configuration Printing

a Self Test

Continuous Self Test

A continuous self test can be useful for troubleshooting paper path and other problems. To print a continuous self test:

LaserJet 41J41VIIA

Disconnect the printer from the power source.

Press and hold down the front panel button while connecting

2. power.

Continue holding the button for: 4L - about five seconds; 4ML - about 15 seconds.

All lights will illuminate at once, then: 4L - each will light in sequence; 4ML - all lights stay lit.

Release the button. The printer conducts its internal diagnostics routine, then prints the self test page continuously until stopped.

To stop the continuous self test (and reset the printer), press

5. and hold the front panel button for a few seconds until all lights

begin lighting in sequence once again. (4ML - the printer can take up to 2 minutes to clear the buffer and stop the self test.)

LaserJet 4P/4MP

Press - to take the printer offline. The On Line light

goes off and the display reads W3

Press - repeatedly until T!Z5T PEW-l is displayed.

Press ~ until

Press ~. The display panel reads W

EUHT SELF TE:ST is displayed.

IHFFL1 NE.

SELF TEST. After a

few minutes a PGL Confirmation self test ~a~e is minted (see Figure 3-7). The self test-page will print m~l~ple ~opies, continuing until the - or ~ key is pressed.

3-24

Installation and Configuration

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. This testis therefore useful for isolating printer problems. The engine test prints a fhll page of vertical lines down the entire printable area, and is thus also useful for checking and adjusting re&istration.

Note

Figure 3-8

An Engine Test can be performed on the

LaserJet 4L and 4ML with the printer covers in place, as shown in Figure 3-8. The LaserJet 4P and 4MP require removal of the covers and the Formatter PCA. Refer to “Engine Test” in Chapter 7 for the engine test procedure.

—

Engine Test EWcm and Printout (LaserJet 4L shown]

3-25

Installation and Configuration Resetting the Printer

Resetting the Printer

Resetting the printer clears the printer’s memory, including unprinted data, downloaded fonts, and macros. It also removes some error conditions, and resets to factory default settings. The printer can be reset at any time, except when there is a service error condition.

LaserJet 4L/4ML:

1. Hold the front panel button down for at least five seconds.

Release when all lights illuminate in succession from bottom to top.

2. After the printer has finished the reset, the Ready light comes on (if there are no printer errors).

LaserJet 4P/4MP:

The LaserJet 4P/4MP has several kinds of resets, as explained below.

Simple Reset

A simple reset does the following:

Clears the printer’s page buffer. Removes all temporary typefaces and macros. Makes the current user-selected defaults “active” (making them

the default values until you change them again). Purges the input buffer of the active 1/0 (the other I/O buffer is

not affected).

To perform a simple reset:

1. Press_ to take the printer offline. The On Line light

goes off and 2S ]H%i-Ii!~ appears on the display.

2. While holding down the ~ key, press - briefly.

3. S7 ~~s~~ appears on the the on-line, 5E Z=W+ state.

3-26

display. Then the printer returns to

Installation and Configuration

Resetting the Printer

The Menu of Resets

Additional reset options are available through the Menu of Resets. Use the Menu of Resets option with caution. It can result in loss of buffered page data or printer configuration data. You should only use it when:

You wish to restore the default printer settings. Communication between the printer and computer is

interrupted. You are using both the serial and the ~arallel I/O ~orts. and one

of the ports ii having problems. ‘

To access the Menu of Resets:

Press - to take the printer offline.

Hold down both the ~ and ~ keys for at least 10

seconds until ==:;:=-~=mw!appears on the display.

❑ or H to cycle through the items.

Use Press ~ to select your choice of resets. An asterisk *

appears by the reset option. Press - to execute the reset.

The foIlowing table shows the three reset options.

Table 3-2

Menu Selection

RESET.MENU

Menu of Resets (LaserJet 4P/4MP)

Printer Response

09 MENU RESET

RESET=MENU restores most of the printer’s

Explanation

factory default settings. It also performs a simple reset. Items in the Config, Parallel, and Serial Menus are not reset, RESET=MENU clears only the active input buffer.

RESET.ACTIVE 1/0 09 RESET ACTIVE 1/0

RESET= ACTIVE 1/0 clears the input and output buffers for the active //0 dy, and performs a

simple reset.

RESET ALL l/O 09 RESET ALL 1/0

RESET=ALL l/O clears the input and output buffers for both 1/0s, and performs a simple reset.

Installation and Configuration Resetting the Printer

The Cold Reset (LaserJet 4ML/4P/4MP)

Cold reset clears all data from the printer’s memory and sets all the defaults back to the factory settings. (NOTE: The LaserJet 4L is effectively “cold reset” whenever power is removed.)

To perform a cold reset:

LaserJet 4ML:

Cold Reset can be performed on the LaserJet 4ML through the HP Explorer Utility (refer to the Software/Solutions package for instructions).

LaserJet 4P/4MP:

Turn off the printer.

While holding the _ key down, turn the printer on.

m !CDLE, 13z !<ELF

RESET appears briefly on the display, then

TEN appears.

After about 30 seconds, fi~i

CIFFL1 w appears on the display, and

the cold reset is complete.

Press - to return the printer on line. MURE=o’,’appears on the display.

Installation and Configuration

PJL Software Commands

Many of the control panel functions explained in this chapter can

also be accessed through PJL software commands sent from the host computer. For the LaserJet 4ML printer, functions such as entering Service Mode, are accessible commands. (Note that Service Mode is available only on the LaserJet 4ML, 4P and 4MP, and

The following example shows how to use PJL commands to enter Service Mode and perform various Service Mode configuration tasks.

only through PJL

not on the LaserJet 4L.)

Note

Table 3-3

PJL Command

‘cYo-l 2345X@PJL @PJL SET SERVICEMODE=HPBOISEIE @PJL SET PAGES=O @PJL SET CRPAPER=LETTER

@PJL SET SKIPDEMO=FALSE @PJL SET DIAGNOSTICS=OFF @PJL SET SERVICEMODE=EXIT @PJL DEFAULT PAPER. LETTER @PJL RESET ‘cYo-l 2345X

Ecz

ECE

Text is CASE-sensitive in PJL; enter exactly as shown. The Ec symbol stands for the ASCII escape character (ESC or /027). When the PJL code is entered, print the data file (or use the

COPY command to copy it to the printer).

DOS

Example: PJL Service Mode Commands

Explanation

Start PJL job. Enter Service Mode Set page count [= XXXXX] Sets cold reset page size [= Letter/A4] Skips demo/PCL type page [= true/false] Sets diagnostics [= OFF/ON] (for ISV use) Exits Service Mode Selects user paper size default Performs PJL reset Exits PJL mode Prints Self-Test page Resets the printer.

3-29

Installation and Configuration PJL Software Commands

3-30

b’

Maintenance

Service Checkpoints

Figure 4-1 Service Checkpoints

1. Upper Fusing Assembly,

2. Beam-to-Drum Mirror.

3. Transfer Roller Assembly.

4. Toner Cartridge. 5, Registration Roller.

6. Front Oblique Roller.

7. Pickup Feed D-Roller. 8, Photosensitive Drum.

9. Fusing Pressure Roller.

10. Face-Up/Face-Down Deflector.

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.

Table4-1 l-ik l%pectamy cdConsumables

EST

DESCRIPTION PART NO.

LIFE

(P9S)

Toner Cartridge (user replaceable)

92274A

When print becomes faint,

3000’

shake cartridge to distribute remaining toner.

Transfer Roller RF5-0596-OOOCN 100,000 May affect print quality

and /or ~a~er movement,

Pickup Feed D-Roller

RBI-3368-OOCN

100,000

Look for glazing andlor

cracks.

Pickup Assembly RG5-0796-OOOCN

100,000

Look for glazing andlor cracks, gear wear, sticky solenoids, etc.

Front Oblique Roller

RG5-0669-OOOCN

Assembly Fusing Assembly

100-120 V, 50/60 Hz

RG5-0676-OOOCN

(exchange part no.) C2003-69001

100,000

Look for glazing andior cracks,

May affect print quality and /or paper movement, Look for marks on lower pressure roller or upper Teflon sleeve.

220-240 V, 50 Hz RG5-0677-OOOCN

(exchange parl no.)

* 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.

C2003-69002

REMARKS

4-3

Maintenance

Life Expectancy of Consumables

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.

A toner cartridge will print approximately 3000 pages when using

a typical word processing application, in which text covers about 5% of the page (see Figure 4-2).

Figure

4-4

4..2

Sample 5% Rage Coverage

Maintenance

Life Expectancy of Consumables

When regularly printing pages with less coverage, such as short memos, a toner cartridge should print over 3000 pages. However, if routinely printing very dense print, the cartridge will not print a full 3000 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 can be turned on or off via the printer’s front panel (LaserJet 4P/4MP only), through HP Explorer’s Remote Control Panel or through a software application with the appropriate printer driver. See Chapter 3 for information on the HP Explorer Remote Control

Panel.

Notes

EconoMode functions in portrait orientation only.

Some software applications may refer to this as “draft mode.”

Software settings always override front control

panel selections (LaserJet 4P/4MP).

4-5

Maintenance

Cleaning Printer

(hnponents

Cleaning Printer Components

CAUTION

Table4-2

COMPONENT

Outside Covers

Inside General

Front Oblique Roller

Pickup Feed D-Roller Registration Roller Transfer Roller

Beam-to-Drum Mirror

Fusing Pressure Roller Use a cloth or swab dampened with water. Face-up Deflector 4nti-Static Teeth

Do not use ammonia-based cleaners in or around the printer. They will cause damage to the toner cartridge’s photosensitive drum.

—

Cleaning Printer Components

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 cloth or swab dampened with ethyl or isopropyl

alcohol.

Use a water-dampened lint-free cloth. Use a dry lint-free cloth, Use a dry, lint-free cloth. DO NOT TOUCH with your

fingers. Use filtered, compressed air first. If not effective, use a lint-

free cloth or swab dampened with lens cleaner.

Use a cloth or swab dampened with water. Use compressed air. Refer to Chapter 6 for removal

procedure. WARNING!:The Anti-Static Teeth are extremely sharp. Be careful!

CLEANING METHOD/NOTES

4-6

Maintenance

Cleaning Printer Components

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 dampened in cold water. Do not touch the Transfer Roller with the damp cloth or 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.

4-7

HP C2040A, C2005A, 4MP, 4P, C2015A Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual