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HP 5 C3916A, C2021A, 5n C3952A, 5m C3917A, 4 plus C2037A 3a Top Cover Assembly for LaserJet 4/4+

Models: 4 plus C2037A 5m C3917A C2021A 5n C3952A 4 C2001A 5 C3916A

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Troubleshooting Specifications Install Parts list Error codes Parts and Diagrams Solenoid Signals Setting the Cold Reset Default Wires in the gear cover slots Warranty

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Figure 8-3a Top Cover Assembly for LaserJet 4/4+

8-8 Parts and Diagrams

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HP 5 C3916A, C2021A, 5n C3952A, 5m C3917A, 4 plus C2037A, 4 C2001A manual 3a Top Cover Assembly for LaserJet 4/4+

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Contents

Page Warranty Conventions T ePage Contents Page Preventive Maintenance Functional Overview Removal and Replacement Troubleshooting Parts and Diagrams Duplexer LaserJet 5/5M/5N Printer Page Contents-10 Printer Features Product Information Product Family Information Product Family Compatibility Matrix Identification CodeMeaning Printer Identification Label for the HP LaserJet 4/4M Specifications Printer DimensionsPower Specifications HP LaserJet 4 and 4 Plus Electrical Specifications Environmental Specifications Related Documentation Printer DocumentationHP LaserJet 4 Documents-Description Part Number HP LaserJet 4 Plus Documents-Description Part Number U t i o n Safety InformationProduct and Laser Safety FCC RFI Statement Laser Statement Sweden/Finland Laserturvallisuus Luokan 1 Laserlaite Toner Safety Ozone Statement HP FIRST, Europe Doing Business with HPTechnical Assistance HP Asap 1-800-333-1917 U.S HP CompuServe Forum Customer Information CentersCustomer Support Center Assist Line Printer Drivers European Customer Support Center Other Areas Site Planning Requirements Site Requirements Printer Space Requirements Space Requirements Media Specifications for PC Tray Tray Print Media SpecificationsMedia Specifications for MP Tray Tray LaserJet 4 Plus, 4M Plus, 5, 5M, and 5N printers Media Specifications for Optional LC Tray TrayMedia Specifications for Duplex Assembly HP Adhesive Labels Label Construction Overhead Transparencies Envelopes Specifications for Envelopes SpecificationsDimensions Envelope Construction Site Planning and Requirements Configuration Introduction Control Panel Keys Using The Control PanelSee Appendix B for LaserJet 5 information Indicator Lights Indicator Mode Description Control Panel Key Functions Key Function Reset Menu Reset Menu Functions Control Panel Menus Control Panel Map Printer Menu Items Options Explanation PCL Menu Items Job Menu Items Configuration Menu Items Memory Configuration Items Parallel Menu Items Serial Menu Items Test Menu Items Printer Features Protection HP LaserJet 4 only Resource Saving HP LaserJet 4 Plus and 5 only Buffering HP LaserJet 4 Plus and 5 only Resolution Enhancement REt EconoMode HP LaserJet 4 Plus and 5 only Density Remote Control Panel DOS Select Use Password from the Printer Passwords boxNetwork Security HP LaserJet Utility Macintosh HP JetAdmin Utility Novell Networks EC %-12345X@PJL JOB PASSWORD=numeric passwordSelect Lock Printer Control Panel Ascii PJL Escape Sequence Service Mode Refer to Appendix B for LaserJet 5 information Setting the Page Count Setting the Cold Reset Default Cold Reset Understanding the PCL Self Test Printout Self Test Printout Items for the HP LaserJet 4/4M HP LaserJet 4/4M PCL Self Test Printout Self Test Printout Items HP LaserJet 4 Plus/4M Plus HP LaserJet 4 Plus/4M Plus PCL Self Test Printout Changing the Control Panel Display Language Test Print Button Test Print Button Location Test Print Pattern Parallel DOS Commands System ConfigurationMS-DOS System Configuration Serial MS-DOS Commands Parallel Menu Printer I/O ConfigurationSerial Configuration Pacing Handshaking Serial Cable Pin-outs DB-9 RS-232 Serial Connection HP LaserJet C2932A Cable Pinout for 9 to 9 Pin Connector DB-25 RS-232 Serial Connection HP LaserJet 4 Plus/5 17255D Cable Pinout for 25 to 25 Pin Connector DB-25 Serial Connection HP LaserJet 10 C2933A Cable Pinout for 9 to 25 Pin Connector RS-422A Serial Configuration LaserJet 4 only 11 RS-422A Cable Pinout Modular I/O Configuration Printer Drivers Install Printer Drivers and UtilitiesHow to Obtain Printer Drivers DOS Utilities Packing Checklist Packing the PrinterRepackaging Instructions Canada Installing The Optional Lower Cassette 12 Installing the Printer on the Lower Cassette 14 Adjust the cassette for the paper size you want to load 13 Pull the cassette tray straight out of the printer Configuration Exec 20 Slide the cassette back into the Lower Cassette assembly Envelope Feeder Installation 21 Remove the Black Plastic Cover LaserJet 4 and 4 Plus LaserJet Simm Installation Protecting the Simm Board 23 Identifying the Four Simm Slots 12Minimum Memory Recommendations LaserJet 4 Only PCL Only PostScript Only Resolution 300 dpi 600 dpiMemory Requirements HP LaserJet 4+/4M+/5/5M/5N Simm boardsHP LaserJet 4/4M Accessing the Simm Slots Installing the Simm Boards 25 Installing the Simm Board Running a Self Test Printout Testing a Simm BoardMemory Simm Personality Simm PostScript Troubleshooting a Simm Board Service / Error Messages Configuration Preventive Maintenance Selected Service Consumables Life Expectancy of Consumables Service Checkpoints Maintenance Checkpoints Cleaning Your Printer Toner Cartridge Saving Toner with EconoMode HP LaserJet 4 Plus and 5 Only Storing the Toner Cartridge Installing the Toner Cartridge Removing the Toner Cartridge Sealing Tape Inserting the Toner Cartridge Non-HP Toner Cartridges Clearing the Toner LOW Message Periodic Maintenance Procedures Removing the MP Tray Tray 1 Pickup Roller Removing the MP Tray Tray 1 Separation Pad Removing the PC Tray 2 Pickup Roller Removing the Lower Cassette LC or Tray 3 Pickup Roller Removing the Lower Cassette Pickup Roller Removing and Replacing the Transfer Roller Replacing the Transfer Roller Removing the Transfer Roller Replacing the Transfer Roller Functional Overview DC Controller System DC Controller Loads DC Controller Loads Serial Data Communication Serial Data Flow Solenoid Description Solenoid SignalsSolenoids Photosensors LJ 4 / 4 Plus Photosensor Signals Sensor Description Microswitches Microswitch Signals Switch DescriptionSwitch Settings for PC Tray 2 and LC Tray PC Tray 2 and LC Tray 3 Tray Size Sensing System Motors Motors Description Paper Jam DetectionMotors Formatter System Control Formatter PCA-Functional Areas Memory Management Data Processing PJL Overview Image Formation System Image Formation System Photosensitive Drum Drum Sensitivity Cleaning Stage Drum Cleaning Station Conditioning Stage Primary Charging Roller Writing Stage 11 Drum Signals Developing Stage 12 Image Development 13 Developing Potentials Transferring Stage 14 Transfer of the Toner Image and Paper Separation Fusing Stage 15 Fusing the Toner to the Paper Paper Feed System 16 Input Paper Feed System Diagram 17 Paper Feed Assembly Sectional View Part Description Printing from the MP Tray Tray 18 MP Tray Tray 1 to Output Tray Paper Path Printing from the PC Tray Tray Power System 20 Power System Block Diagram Basic Sequence of Operation Standard Printer Operation Timing Diagrams 21 MP Tray Timing Diagram-HP LaserJet 4/4M This a 2 panel pull-out Standby Period PowerSaveWarmup Period Initial Rotation Period Page Print Period Page Last Rotation Period Removal and Replacement U t i o n T e Required Tools Required ToolsHardware Review Printer Hardware Descriptions Drawing Description Purpose LJ 4/4 Plus Removing the CoversRight Side Cover Removal Top Cover Removal Front Top Cover Screws and Latches Control Panel Cable Left Side Cover Removal Left Side Cover Latches Rear Door Removal Releasing the Door Support 7a Releasing the Door Hinge LaserJet 4/5 Font Door Cover Removal LJ 5 Right Front Cover Removal Font Door Removal LaserJet 4 shown Font Door Cover Latches Multi-Purpose MP Tray Tray 1 Door Removal 10 Removing the MP Tray Door Multi-Purpose MP Tray Tray 1 Removal 11 Remove the Crossmember Bracket 12 Rotate the Tray Down to Release the Hinge from its Slots Power Supply Removal Assemblies Removal 13b Remove the Sheet Metal Plate LaserJet 4 Plus/5 15 6-wire and 3-wire Connectors for the Power Supply Paper Feed Assembly Removal 16 Paper Feed Assembly Screws and Connectors 17 MP Tray Opening Cover 18 Paper Feed Assembly Screws numbered High Voltage Power Supply Hvps Removal 19 Hvps Screws 2 and Latches 2 Bottom View Fuser Assembly Removal U t i o n Control Panel and Overlay Removal 21 Control Panel Latches 22 Changing the Control Panel Overlay Removing the SIMMs Door LaserJet 23b Opening the SIMMs Door LaserJet 4 Plus LaserJet 4 Plus/5 Formatter Cage Removal 24a Formatter Cage Screws Right Side View LaserJet 4 T e 24b Formatter Cage Screws Right Side View LaserJet 4 Plus Formatter PCA Removal LaserJet 4 Formatter PCA 25a Formatter Cover and PCA Mounting Screws LaserJet 25b Interface Connector Support Screws LaserJet T e Plus Interface Connector Support Screws LaserJetLaserJet 4 Plus and 5 Formatter PCA 27a DC Controller Connectors/Retaining Clips LaserJet T e DC Controller Removal Removal and Replacement DC Controller Installation 28 Leading Edge Registration Adjustment Dimensions Main Motor Assembly Removal 30 Main Motor Assembly Gear Assembly Removal 31 Gear Assembly Screws Located behind Main Motor Fan Connector Fan Removal 33 Exhaust Fan Removal Laser Jet 4 shown Output Assembly Removal 34 Output Assembly Removal Paper Exit Sensor PS3 Removal Exit Sensor Scanner Assembly Removal 36 Scanner Assembly Removal Lower Cassette Assemblies Lower Cassette Sensor PCA Removal Lower Cassette Pickup Motor Removal 38 Lower Cassette Upper Front Cover 39 Lower Cassette Motor Replacing Fuser Assembly Parts Fuser Assembly Configuration Fuser Assembly ConfigurationFuser Assembly Removing the Fuser Roller Heat Lamp 41 Fuser End Cap Removal LaserJet 4 only 42 Fuser Wire Harness Cover Removal LaserJet 42b Fuser Cover End Latches LaserJet 4 Plus 43 Left Side Fuser Cover Gear Side Heat Lamp Connector Bushing on the left side of the Fusing Roller Wires in the gear cover slots Fuser Gear Cap Removal Fuser Assembly Thermoswitch Removal 46 Fuser Thermoswitch Connectors 47 Thermistor Connector Thermistor Removal 48a Upper Fuser Frame Removal LaserJet 48b Upper Fuser Frame Removal LaserJet 4 Plus Paper Control PCA Removal 49 Paper Control PCA Retaining Screws and Latches Sensor PCA Removal 50 Sensor PCA Removal PS1 and PS2 Sensor Assembly Removal 51 Removing the PS1/PS2 Sensor Assembly High Voltage Contact Plate Hvcp and Paper Guide Removal 52 Guide Plate Cover Screw 53 Paper Guide Rollers 54 Cross Member Screws 55 Left Toner Cartridge Guide Plate Screw 56 High Voltage Contact and Feed Guide Assembly Latches 57 Orientation of Hvcp and Left Guide Plate Interconnect PCA Removal 58 Right Side PC tray Rail Cover printer on right side 59 Interconnect PCA latches and AC Connector Mounting Pins 60 Correct Orientation of AC Connector Notch at Upper Left Removal and Replacement LaserJet 5 Error Map Message on LJ 5/5M/5N Recommendations LaserJet 5 Error Map LaserJet 5 Error Map 7-C LaserJet 5 Error Map Pre-Troubleshooting Procedures Preliminary Operating Checks Printer Message Troubleshooting Message Symptoms and RecommendationsPrinter Message Summary Table Printer Messages Returns all printer settings to Printing Menu settings, This message is displayed when the MIO AUX IO card is For serial/Bi-Tronics parallel configuration, the computer Refer to the Product Family Compatibility Indicates a communications problem between the DC Printer identified an internal service error. If this error An error state. To clear this message, remove Clearable Warnings Clearable Warning Messages Meaning Printer Message Troubleshooting Procedures Blank DisplayBlank Display Checks Action MP/PC/LC Tray 1/2/3 Load Message MP/PC/LC Tray 1/2/3 Load Message Checks Figures 7-14 and 7-15 for locations Cassette Size Switches SW603, SW604, SW605 Functional Check PC Tray Size Sensing Microswitches Location Switch Logic for Cassette Size Paper Size Sensing Lower Cassette PC Empty Sensor PS2 Functional Check PS4 Check MP Tray Empty Sensor Printer Open Message Printer Open Checks SW601 Functional Check Location of the Top Cover Closed SW601 Actuator Paper JAM Message PS1 and PS3 Paper Path Sensors & PS5 Paper End Sensor Paper Jam Troubleshooting Checklist Jam Location Checks and Action Required PS1 Input/Registration Sensor Check PS1 Input/Registration Sensor PS3 Exit Sensor Check Pickup Motor Functional Test M2 Lower Cassette Functional Check No EP Cart Message Toner Low Message Callout Assembly Toner Cartridge Components Error Message Error Checks Error Message Recommended Action Service Error Fuser Malfunction Service Fuser Malfunction Checks Fuser Assembly Connector 1151 Error Beam Detect Checks Error Scanner Malfunction Laser/Scanner Assembly Functional Checks 57 or 57.1 Service Message Main Motor Failure Main Motor Functional Checks 58 or 57.2 Service Fan Failure Image Defect Summary Image Defect Summary Image Defect Summary Any Faint Print Condition Black PagesPossible Cause Action Faulty Registration Right-Hand Image Missing Small Print VoidsRandom Horizontal Black Lines Vertical White Streaks Repetitive Defects Smeared Print/Improper Fusing Distorted Print 22Black Pages with Horizontal White Strips Image Skew Improperly Sized Image PS5 Check MP Tray Paper End Sensor Functional Test PS5 Test Sheet Vertical Dark Streaks Large Print Voids LaserJet Family Paper Specifications Background Scatter White or Blank Pages Image Formation Troubleshooting Half Self-Test Functional Check Drum Rotation Functional Check High Voltage Power Supply Assembly 29High Voltage System Checks Test Message Interface TroubleshootingCommunications Check Serial MS-DOS Commands AUTOEXEC.BAT Standard ConfigurationsParallel DOS Commands Communications Checks Communications Checks HP LaserJet printers are not designed to work MIO Troubleshooting Troubleshooting Hints Explanation of Self Test Printout 10 MIO Staus Information on the Self Test Printout Troubleshooting Aids Component Locations 12 Major Assembly and Connector Locations 2 Number Part 13 Major Assembly and Connector Locations 3 Number Switch Locations 15 Optional 500 Sheet Lower Cassette Number Part 16 DC Controller PCA Layout-LaserJet 4/4M Number Part 17 DC Controller PCA Layout -LaserJet 4 Plus/5 Number Part High Voltage PCA Layout Number Part Repetitive Defect Template 19 Repetitive Defect Ruler 20 Main Wiring Diagram LJ 4+/5 only Voltage Test Points Measuring the DC Voltage LevelsTB 201Voltages Color Pin Number Troubleshooting Parts and Diagrams How To Use the Parts Lists Parts Lists and Illustrations 1a Field-Replaceable Assemblies 1 1b Field-Replaceable Assemblies 2 Field-Replaceable Assemblies Exchng # Description Field-Replaceable Assemblies Covers and Panels Covers and Panels 3a Top Cover Assembly for LaserJet 4/4+ Top Cover Assembly Cable, Display Panel 3b Top Cover Assembly for LaserJet Overlay Language 4a Internal Components 1 4aInternal Components Section RB1-2111-030CN Shutter, arm RB1-2114-000CN 4b Internal Components 2 Lnternal Components Section 4c Internal Components 3 Internal Components Section C2038-60004 LJ4+ C3919-67901 4d Internal Components 4 RB1-2251-000CN Block, Connecting RG5-0521-000CN Main Switch Assembly Main Switch Assembly 6a Paper Feed Assembly 1 6b Paper Feed Assembly 2 Paper Feed Assembly MP Tray Tray 1 Assembly MP Tray Tray 1 Assembly Paper Output Assembly Paper Output Assembly Delivery Sensor Assembly Delivery Sensor Assembly 10 Fuser Assembly Fuser Assembly RS5-0232-000CN Accessory Parts 11 Lower Cassette Base Assembly Lower Cassette Base Assembly Lower Cassette Drive Assembly Lower Cassette Drive Assembly 13 Lower Cassette Assembly 13Lower Cassette Assembly 14 Universal Cassette Simm Modules Universal CassetteSimm Memory Miscellaneous Parts and Accessories Miscellaneous Parts and Accessories Parts List Alphanumeric Parts List PCA Parts and Diagrams Parts and Diagrams Parts and Diagrams Parts and Diagrams Parts and Diagrams Parts and Diagrams C2084C +/5 Parts and Diagrams Parts and Diagrams Parts and Diagrams Parts and Diagrams Parts and Diagrams Parts and Diagrams Parts and Diagrams Parts and Diagrams Duplexer Figure A-1 Duplexer Paper Path Holding Tray Switchback AssemblyDuplex Printing Figure A-2 Duplexer Major Components Figure A-3 Electrical Block Diagram Electrical Overview Installing the Optional Duplexer LJ 4 + Figure A-4 Duplexer Installation/Removal R n i n g U t i o n Removal and ReplacementRequired Tools Removing the Switchback Covers Removing the Covers Removing the Side Cover on Power Side Figure A-6 Removing the Side Cover on Gear Side Figure A-7 Side Cover on Gear Side Figure A-8 Latch Location on Underside of Duplexer Removing the Back Cover Removing the Front Cover Removing Internal Duplexer Components Removing the Fan/Motor/Solenoid/Sensor Removing the Switchback Paper Guide Figure A-11 Switchback Paper Guide Removing the Paper Guide Assembly Figure A-12 Wire Routing and Upper Switchback Guide Screw Removing the Paper Roller Figure A-13 Solenoid Arm Figure A-14 Upper Paper Guide Sheet Metal Figure A-15 Gears on Paper Roller Removing the Control PCA Figure A-16 Figure A-17 Control PCA Removing the Power PCA Figure A-18 Power PCA Figure A-19 Plate on Power PCA Side of Duplexer Removing the Holding Tray Center Paper Guide Removing the Holding Tray Belt Figure A-20 Holding Tray Belt Cover Plate Figure A-21 Holding Tray Gears and Belt Removing the Holding Tray Paper Sensor Figure A-22 Holding Tray Paper Sensor Removing the Switchback Assembly Figure A-23 Switchback Assembly Hinge Pins Parts and Diagrams for the Duplexer Figure A-24 Duplex External Covers Table A-24 Duplex External Covers Description Figure A-25a Duplex Feeder Assembly 1 Figure A-25b Duplex Feeder Assembly 2 Table A-25 Duplex Feed Assembly Description RF1-3817-00017 Figure A-26a Duplex Switchback Assembly 1 Figure A-26b Duplex Switchback Assembly 2 Table A-26 Duplex Switchback Assembly Description Description LaserJet 5/5M/5N Printer Product Information Table B-1 HP LJ4M+ HPLJ5 HPLJ5M HPLJ5N Table B-2 LaserJet 4? LaserJet 4 Plus? LaserJet 5? LaserJet 5/5M/5N Printer B-5 Table B-4 Table B-3Printer DimensionsHP LaserJet 5 / 5M / 5N Table B-6 Table B-5 Table B-7 HP LaserJet 5/5M/5N Part Number Documents-Description Laser Statement Sweden/Finland Control Panel Layout Control Panel Keys Table B-8 Control Panel Keys Explanation Printer back on line Key Explanation Value + To change a control panel setting Figure B-3 Control Panel Menu Map Printing Menu TableB-10 Printing Menu Items Media size PCL Fonts Menu Table B-11 PCL Fonts Menu Items PostScript Menu Job MenuTable B-12 PostScript Menu Items Table B-13 Job Menu Items Configuration Menu Table B-14 Configuration Menu Items Auto OFF Memory Configuration Menu Table B-15 Memory Configuration Menu Items Table B-17 Serial Menu Items Serial MenuTable B-16 Parallel Menu Items Resets Menu Table B-18 Resets Menu Items Test Menu Table B-19 Test Menu Items LaserJet 5/5M/5N Printer B-25 Service Mode Setting the Cold Reset Default Big Data DiagnosticsSkip Demo Programming a Flash Simm Changing the Control Panel Display Language Nvram Init Table B-20 Self Test Printout Items for the HP LaserJet Figure B-4 HP LaserJet 5 PCL Self Test Printout Infrared Communication Figure B-5 IR Data Flow System Requirements To Print Using the Infrared Port Figure B-6 IrDA Port Location Figure B-7 IrDa Port Ranges Troubleshooting IR Printing Problems Figure B-8 Infrared Test Tool Page Table B-21 Solutions for Infrared Not Responding Situation Infrared Port Not Responding Situation Solution Index Index-1 Index-2 Index-3 Index-4 Index-5 Index-6 Index-7 Index-8 SN-1 Service Notes SN-2 Service Notes SN-3 Service Notes SN-4 Service Notes SN-5 Service Notes SN-6 Service Notes SN-7 Service Notes SN-8 Service Notes C3916-90984

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