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

...

Combined Service Manual

HP DOC

Back to Welcome

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

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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

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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