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HP LaserJet 8000, 8000 N, 8000 DN and HP LaserJet Mopier 240 Printers Service Manual

Service Manual

HP LaserJet 8000 (C4085A) HP LaserJet 8000 N (C4086A) HP LaserJet 8000 DN (C4087A) HP LaserJet Mopier 240 (C4228A)
Copyright Hewlett-Packard Company 1998
All Rights Reserved. Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright laws. Publication number C4085-91087 First edition, November 1998
Warranty The information contained in this document is subject to change without notice. Hewlett-Packard makes no warranty of any kind with regard to this material, including, but not limited to, the implied warranties or merchantability and fitness for a particular purpose. Hewlett-Packard shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material.
WARNING Electrical Shock Hazard To avoid electrical shock, use only supplied power cords and connect only to properly grounded (3-hole) wall outlets. Adobe and PostScript are trademarks of Adobe Systems Incorporated which may be registered in certain jurisdictions. Windows is a U.S. registered trademark of Microsoft Corporation.
Hewlett-Packard Company 11311 Chinden Boulevard Boise, Idaho 83714 U.S.A.

Conventions

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

WARNING!

The illustration below shows the orientation of the paper-handling accessories as they are referred to in this publication.

C4085-91087

Chapter Descriptions

1 Product Information

Contains printer features and product overview, tray capacities and sizes, media specifications, service approach, how to get technical assistance, and required safety and compliance statements.

2 Site Requirements

Contains space and environmental requirements.

3 Operating Overview

Contains details about control panel menus, restoring factory defaults, and resetting and testing the printer.
4 Maintenance and Adjustments
Contains cleaning and preventive maintenance information, and adjustment procedures for paper trays.

5 Functional Overview

Contains block diagrams and basic theory of operation for the printer systems, paper paths, and paper handling accessories. Contains basic cabling information.
6 Removal and Replacement
Contains step-by-step procedures for replacing field replaceable units (FRUs) in the printer and paper-handling accessories.

7 Troubleshooting

Contains a preliminary troubleshooting table, a table with descriptions and recommended actions for all control panel messages, image defect samples, and troubleshooting checks and tools.

8 Parts and Diagrams

Contains exploded view drawings and part number listings for all replaceable parts in the printer and paper-handling accessories. Contains two replaceable parts tables: one sorted alphabetically by part name, and one sorted numerically by part number. Both tables are cross referenced to the diagrams in the chapter.

Subject Index

Contains an alphabetical, cross referenced listing of information found in the main body of the manual.

Table of Contents

Printer Features.2 Paper Capacities and Sizes.4 Identification.6 Model and Serial Numbers.6 Specifications.7 Media Selection Guidelines.11 Paper.11 Envelopes.11 Adhesive Labels.12 Transparencies.13 Storing Print Media.13 Shipping Print Media.13 Product Overview.14 External View of HP LaserJet 8000/N/DN Engine.14 External View of HP Mopier 240.16 Formatter Assemblies.18 Accessories and Options.19 Ordering Information.20 Hard Disk.26 Determining Memory Requirements.26 Service Approach.28 Ordering Parts.28 Exchange Program.29 Consumables.29 Toner Cartridge Life.29 Refilled Toner Cartridges & Non-HP Staple Cartridges.30 Recycling Toner Cartridges.30 Technical Assistance.31 HP FIRST (Fax Information Retrieval Support Technology).31 Internet.32 World Wide Web.32 HP Reseller Sales and Service Support Line.32 Other Areas.32 Warranty.33 Regulatory Information.35 FCC Regulations.35 Environmental Product Stewardship.36 Protecting the Environment.36 C4085-91087 vii
Material Safety Data Sheet.38 Environmental Conformity.39 Declaration of Conformity.40 Safety Statements.42 Laser Safety Statement.42 Canadian DOC Regulations.42 VCCI Statement (Japan).42 Korean EMI statement.43 Laser Statement for Finland.43
Operating Environment.46 Space Requirements.47 Environmental Requirements.49
Using the Control Panel.52 Control Panel Layout.52 Indicator Lights.53 Settings and Defaults.54 Printer Driver Information.54 Paper Source Default.54 Resetting the Printer.55 Setting the Display Language.55 Control Panel Menus.58 Information Menu.59 Paper Handling Menu.60 Print Quality Menu.62 Printing Menu.64 Configuration Menu.67 I/O Menu.70 EIO Menu.72 Resets Menu.74 Service Mode.75 Setting Page Count, Maintenance Count, and Serial Number.78 Setting the Cold Reset Default Paper Size.79 Testing the Printer.80 Paper Path Test.80 Configuration Page.80

Cleaning the Printer and Accessories.82 Cleaning Spilled Toner.84 Preventative Maintenance.85 Tray Adjustment Procedure.86 Tray 4 (2000-sheet Input Tray) Adjustment Procedure.88
Printer Functional Block Diagram.92 Power Distribution System.93 AC Power Distribution.94 Overcurrent/Overvoltage Protection.94 High Voltage Power Distribution.95 Formatter System.96 DC Controller System.99 Laser and Scanner Drive.99 Paper Motion Monitoring and Control.99 Clutches.99 Engine Test Microswitch.100 Motors.100 Image Formation System.101 Toner Cartridge.102 Drum Cleaning.104 Drum Conditioning.105 Image Writing.106 Image Developing.108 Image Transferring and Media Separation.110 Image Fusing.111 Paper Paths and Components.112 Printer, Duplexer, and Envelope Feeder.112 Paper Size Switches (Trays 2 and 3).115 Printing from Tray 1.115 Printing from Trays 2 and 3.115 Printing from the Envelope Feeder.116 Printing with the Duplexer.116 Printing from the Custom Height and Size Paper Tray.116 2000-sheet Input Tray (Tray 4) Components.117 2000-Sheet Input Tray Operation.x 500-sheet Input Tray.x 500-sheet Input Tray Operation.124 7-bin Tabletop Mailbox Components.126 7-bin Tabletop Mailbox Operation.128 8-bin Mailbox Components.132 8-bin Mailbox Operation.135 Finisher Components.137 Stapler Unit Operation.139 C4085-91087 Table of Contents ix
Main Functional Cycles of the Stapler (Internal Paper Path).141 Communication Link (Daisy Chain).142 Paper Jam Detection.144 Printer Timing.144 IEEE 1284 Parallel Cable Information.147
Removal and Replacement Strategy.150 Required Tools.151 User Installable Accessories.152 Hardware Table.160 Engine Removal and Replacement.162 Control Panel.163 Covers.165 Delivery Unit (for Standard Output Bin).174 Diverter Assembly.177 Diverter Door Assembly.178 Lower Right Door Assembly.179 Fan 1, Laser/Scanner and Housing (Exhaust).182 Fan 2, Low Voltage Power Supply (Exhaust).184 Fan 3, Formatter Fan and Housing (Intake).185 Fan 4, Delivery Unit (Exhaust).186 Tray 1.187 Tray 1 Pickup Assembly.190 Feeder Assembly.194 Formatter Assembly.196 Fusing Assembly.198 Laser/Scanner Assembly.200 Main Gear Assembly.202 Main Motor Assembly.205 Paper Input Unit (PIU).206 PCA, DC Controller.207 Output Paper Sensor PCA.208 High Voltage Power Supply (HVPS).215 Low Voltage Power Supply (LVPS).216 Registration Assembly.217 Tray 1 Feed Roller and Separation Pad.220 Tray 2 and 3 Pickup, Feed, and Separation Rollers.222 Paper Input Unit Sensor (PS2).223 Registration Sensor (PS1).225 Face-up Solenoid Assembly (SL3).227 Transfer Roller Assembly.228 Tray 2 and 3 Assemblies.230

2000-sheet Input Tray Removal and Replacement.231 Orientation.232 Front Cover.233 Back Cover.234 Left Cover.235 Right Cover.236 Main Drive Assembly.237 Paper Tray.239 Main Cable Harness.240 Controller PCA.242 Front LED PCA Assembly.244 Pickup Assembly.246 Power Supply.248 Pickup, Feed, and Separation Rollers.250 Paper Quantity Switch Assembly.253 Paper Size Switch Assembly.253 Vertical Transfer Unit (VTU).255 Tension Springs.257 Locating Pins.258 Casters and Stabilizing Feet.259 Adjustable Foot.x 500-sheet Input Tray Removal and Replacement.261 Orientation of the 2 x 500-sheet Input Tray.262 Back Cover.263 Left Cover.264 Vertical Transfer Unit (VTU).265 Right Cover.268 Front Top Cover.271 Trays 4 and 5.274 Pickup Assembly.276 Paper Deck Drive Assembly.278 Pickup, Feed, and Separation Rollers.280 Controller PCA.281 Tray-Size Sensing PCA.282 Power Supply.284 Main Cable.285 Storage Paper Tray.287 Front Door (Storage Area).288 Casters.289 Foot Tip and Adjustable Foot Tip (Stabilizing Feet).290 Locating Pins.291 Front LED PCA.292 7-bin Tabletop Mailbox Removal and Replacement.293 Orientation of the 7-bin Tabletop Mailbox.294 Front Cover.295 Back Cover.298 Top Cover.300 C4085-91087 Table of Contents xi
Controller PCA.304 Power Supply.305 Right Door Assembly (Paper Path Cover).306 Face-down Bins.310 Empty Bin Sensor PCA.313 Full Bin and Interlock Sensor PCA.315 LED PCA.317 Face-up Sensors PCA.318 Reversing Mechanism Motor.319 Face-up/Diverter Assembly (Flipper).321 Short Tray 7.324 Solenoid Reversing Mechanism.325 Flipper Solenoid.326 Handle.327 Latching Mechanism.328 Cover Latch.329 8-bin Mailbox Removal and Replacement.330 Orientation.331 Front and Back Covers.332 Top Cover.333 Power Supply.334 Paper Bins and Blind Cover.335 Flipper Assembly.336 Delivery Head Motor.339 Transport Belt Motor.340 Input Paper Guide.342 Metal Tape and Housing Assembly.344 Controller PCA.346 Anticurl Strings.348 Delivery Head Assembly.350 Interlock Switch.355 Diagnostic LED PCA.356 User Status LED PCA.358 Adjustable and Fixed Casters.360 Attachment Assembly.361 Stapler Assembly Removal and Replacement.362 Mailbox with Stapler, Stapler Removal or Installation.363 Back Plate.365 Stapler Controller PCA.367 Top Cover Assembly.370 Stapler Bed Assembly.371 Hinges.373

Troubleshooting Process.376 Printer and Paper-Handling Troubleshooting Process.378 Troubleshooting the Printing System.380 Preliminary Operating Checks.380 General Troubleshooting Information.381 Miscellaneous Problems and Solutions.381 Paper Curl.386 Power On.387 Engine Test.390 Display.391 Event Log.391 General Paper Path Troubleshooting.395 Paper Jams.396 Paper Path Test.398 Printer Messages.401 Control Panel Messages and Errors.401 Printer Message Tables.403 Self - Diagnostics on Paper-handling Devices.440 2000-sheet Input Tray Stand-alone Diagnostics.x 500-sheet Input Tray Standalone Diagnostics.444 7-bin Tabletop Mailbox Standalone Diagnostics.448 8-bin Mailbox Stand-alone Diagnostics.453 Information Pages.461 Menu Map.461 Configuration Page.463 Communication.467 Interface Troubleshooting.467 Image Quality.469 Check the Toner Cartridge.470 Image Quality Tables.471 Repetitive Defect Ruler.484 Image System Troubleshooting.485 High-Voltage Power Supply Check.486 Network Troubleshooting.488 Verify Host System Operation.490 Verify Network and Server Operation.490 Diagrams.491
How to Use the Part Lists and Diagrams.506 Ordering Parts.506 Accessories and Supplies.507 Common Hardware.507 Illustrations and Parts Lists.507 Printer and Paper-Handling Components.508 C4085-91087 Table of Contents xiii
Printer Parts and Diagrams.512 Paper-Handling Devices Parts and Diagrams.524 Input Devices.524 Output Devices.532 Alphabetical Parts List.544 Numerical Parts List.555