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Make/Model Information:

  • Brand:   Hewlett-packard
  • Models included:
    • HP LaserJet 8000
    • HP LaserJet 8000 N
    • HP LaserJet 8000 DN
    • HP LaserJet Mopier 240

File Information:

  • Type:   Factory Service Manual (FSM)
  • Language:   English (EN)
  • Number of pages:   638
  • File size:  ∼ 8.80  MB
  • File Format:   PDF only
  • SME Watermarks:   None
  • Password lock:   No
  • Edit/copy/modify:   Yes
  • SKU:   BMHP-1097

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Hewlett-Packard Co.
Printed in USA
Manual Part No.
C4085-91017
*C4085-91017*
*C4085-91017*
C4085-91017
Printed on at least
50%Total Recycled Fiber with
at least 10% Post-Consumer Paper
English
HP LaserJet 8000, 8000 N, 8000 DN
and HP LaserJet Mopier 240 Printers
Service Manual
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)
iv EN
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.
EN Chapter Contents 1
1 Product Information
Chapter Contents
Printer Features - - - - - - - - - - - - - - - - - - - - - - 2
Paper Capacities and Sizes - - - - - - - - - - - - - - - - 4
Identification - - - - - - - - - - - - - - - - - - - - - - - - 6
Specifications - - - - - - - - - - - - - - - - - - - - - - - 7
Media Selection Guidelines - - - - - - - - - - - - - - - - 11
Product Overview - - - - - - - - - - - - - - - - - - - - - 14
Service Approach - - - - - - - - - - - - - - - - - - - - - 28
Technical Assistance - - - - - - - - - - - - - - - - - - - - 31
Warranty- - - - - - - - - - - - - - - - - - - - - - - - - - 33
Regulatory Information - - - - - - - - - - - - - - - - - - - 35
Declaration of Conformity - - - - - - - - - - - - - - - - - 40
EN Chapter Contents 45
2 Site Requirements
Chapter Contents
Operating Environment- - - - - - - - - - - - - - - - - - - 46
Space Requirements- - - - - - - - - - - - - - - - - - - - 47
Environmental Requirements- - - - - - - - - - - - - - - - 49
EN Chapter Contents 51
3 Operating Overview
Chapter Contents
Using the Control Panel - - - - - - - - - - - - - - - - - - 52
Resetting the Printer - - - - - - - - - - - - - - - - - - - - 55
Control Panel Menus - - - - - - - - - - - - - - - - - - - - 58
Service Mode - - - - - - - - - - - - - - - - - - - - - - - 75
Testing the Printer - - - - - - - - - - - - - - - - - - - - - 80
Cold Reset- - - - - - - - - - - - - - - - - - - - - - - - - 85
EN Chapter Contents 87
Maintenance and
Adjustments
Chapter Contents
Cleaning the Printer and Accessories- - - - - - - - - - - - 88
Preventative Maintenance - - - - - - - - - - - - - - - - - 91
Tray Adjustment Procedure- - - - - - - - - - - - - - - - - 92
Tray 4 (2000-sheet Input Tray) Adjustment Procedure - - - - 94
EN 97
Functional
Overview
Chapter contents
Printer Functional Block Diagram - - - - - - - - - - - - - - 98
Power Distribution System - - - - - - - - - - - - - - - - - 99
Formatter System - - - - - - - - - - - - - - - - - - - - 102
DC Controller System - - - - - - - - - - - - - - - - - - 105
Image Formation System- - - - - - - - - - - - - - - - - 107
Printer Input Sources- - - - - - - - - - - - - - - - - - - 136
Paper Jam Detection - - - - - - - - - - - - - - - - - - - 138
Printer Timing - - - - - - - - - - - - - - - - - - - - - - 138
EN Chapter contents 143
Removal and
Replacement
Chapter contents
Removal and Replacement Strategy - - - - - - - - - - - 145
Required Tools- - - - - - - - - - - - - - - - - - - - - - 146
User Installable Accessories - - - - - - - - - - - - - - - 147
Hardware Table - - - - - - - - - - - - - - - - - - - - - 157
Control Panel - - - - - - - - - - - - - - - - - - - - - - 159
Covers- - - - - - - - - - - - - - - - - - - - - - - - - - 160
Delivery Unit (for Standard Output Bin) - - - - - - - - - - 169
Diverter Assembly - - - - - - - - - - - - - - - - - - - - 172
Door Assembly, Diverter - - - - - - - - - - - - - - - - - 173
Door Assembly, Right Lower - - - - - - - - - - - - - - - 174
Fan 1, Exhaust (Laser/Scanner) and Housing- - - - - - - 177
Fan 2, Exhaust (LVPS) - - - - - - - - - - - - - - - - - - 179
Fan 3, Intake (Formatter) and Housing - - - - - - - - - - 180
Fan 4, Exhaust (Delivery Unit) - - - - - - - - - - - - - - 182
Feeder Assembly - - - - - - - - - - - - - - - - - - - - 183
Formatter Assembly - - - - - - - - - - - - - - - - - - - 185
Fusing Assembly- - - - - - - - - - - - - - - - - - - - - 187
Laser/Scanner Assembly- - - - - - - - - - - - - - - - - 189
Main Gear Assembly - - - - - - - - - - - - - - - - - - - 191
Main Motor Assembly - - - - - - - - - - - - - - - - - - 194
Paper Input Unit (PIU) - - - - - - - - - - - - - - - - - - 195
PCA, DC Controller - - - - - - - - - - - - - - - - - - - 197
PCA, Output Paper Sensor- - - - - - - - - - - - - - - - 198
144 Chapter 6 Removal and Replacement EN
Power Supply, High Voltage (HVPS) - - - - - - - - - - - 205
Power Supply, Low Voltage (LVPS) - - - - - - - - - - - - 206
Registration Assembly - - - - - - - - - - - - - - - - - - 207
Roller and Separation Pad, Tray 1- - - - - - - - - - - - - 210
Rollers: Tray Pickup, Feed, and Separation - - - - - - - - 212
Sensor, Paper Input Unit (PS2) - - - - - - - - - - - - - - 214
Sensor, Registration (PS1) - - - - - - - - - - - - - - - - 216
Solenoid Assembly, SL3 (Face-Up) - - - - - - - - - - - - 218
Transfer Roller Assembly - - - - - - - - - - - - - - - - - 219
Tray 1 Assembly - - - - - - - - - - - - - - - - - - - - - 221
Tray 2 and 3 Assemblies - - - - - - - - - - - - - - - - - 222
Mailbox With Stapler - - - - - - - - - - - - - - - - - - - 223
Stapler Assembly- - - - - - - - - - - - - - - - - - - - - 249
7-bin Tabletop Mailbox - - - - - - - - - - - - - - - - - - 259
2 x 500-sheet Input Tray - - - - - - - - - - - - - - - - - 295
EN Chapter contents 327
7 Troubleshooting
Chapter contents
Troubleshooting Process - - - - - - - - - - - - - 328
Power On - - - - - - - - - - - - - - - - - - - - 332
Display - - - - - - - - - - - - - - - - - - - - - 336
Information Pages - - - - - - - - - - - - - - - - 340
Communication - - - - - - - - - - - - - - - - - 346
Printer Messages - - - - - - - - - - - - - - - - 351
Image Quality - - - - - - - - - - - - - - - - - - 394
Troubleshooting Checks - - - - - - - - - - - - - 412
Diagnostics on Accessories - - - - - - - - - - - 418
General Troubleshooting Information - - - - - - - 426
EN Chapter contents 441
8 Parts and Diagrams
Chapter contents
How to Use the Part Lists and Diagrams - - - - - - 442
Accessories and Supplies - - - - - - - - - - - - - 443
Illustrations and Parts Lists - - - - - - - - - - - - - 444
Alphabetical Parts List - - - - - - - - - - - - - - - 467
Numerical Parts List - - - - - - - - - - - - - - - - 475
English
Hewlett-Packard Co.
Printed in USA
Manual Part No.
C4085-91023
*C4085-91023*
*C4085-91023*
C4085-91023
Printed on at least
50%Total Recycled Fiber with
at least 10% Post-Consumer Paper
HP LaserJet 8000, 8000 N, 8000 DN
and HP Mopier 240 Printers
Service Manual Supplement
for Paper-handling Accessories
(C4781A, C4782A, C4785A)
Contents
Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
New Product Features . . . . . . . . . . . . . . . . . . . . . . . . . . x
1 Theory of Operation
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
2000-sheet Input Tray Theory of Operation . . . . . . . . . . . . . 1-2
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Pickup and Feed System . . . . . . . . . . . . . . . . . . . . . . 1-2
Lifter Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Paper Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Sensors, Switches, Clutches, and Motors . . . . . . . . . . . . . 1-5
Switches Functionality . . . . . . . . . . . . . . . . . . . . . . . 1-7
Multibin Mailbox Theory of Operation . . . . . . . . . . . . . . . 1-8
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Configuring the Operating Modes . . . . . . . . . . . . . . . . . 1-9
Sensors, Switches, Motors, and Controller PCA . . . . . . . . . 1-10
Receiving Paper . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
Delivering Paper . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
Paper Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
Power-on Sequence . . . . . . . . . . . . . . . . . . . . . . . . 1-14
Communication Link (C-link) Cables . . . . . . . . . . . . . . . 1-15
Duplexer Theory of Operation . . . . . . . . . . . . . . . . . . . . 1-16
2 Removal and Replacement
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Required Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2000-sheet Input Tray Removal and Replacement . . . . . . . . . . 2-3
2000-sheet Input Tray Orientation . . . . . . . . . . . . . . . . . 2-3
2000-sheet Input Tray Front Cover . . . . . . . . . . . . . . . . 2-4
2000-sheet Input Tray Back Cover . . . . . . . . . . . . . . . . 2-5
2000-sheet Input Tray Left Cover . . . . . . . . . . . . . . . . . 2-6
2000-sheet Input Tray Right Cover . . . . . . . . . . . . . . . . 2-7
2000-sheet Input Tray Main Drive Assembly . . . . . . . . . . . 2-8
2000-sheet Input Tray Paper Tray . . . . . . . . . . . . . . . . . 2-9
2000-sheet Input Tray Main Cable Harness . . . . . . . . . . . . 2-10
2000-sheet Input Tray Controller PCA . . . . . . . . . . . . . . 2-11
2000-sheet Input Tray Front LED PCA Assembly . . . . . . . . 2-12
2000-sheet Input Tray Pickup Assembly . . . . . . . . . . . . . 2-13
2000-sheet Input Tray Power Supply . . . . . . . . . . . . . . . 2-15
2000-sheet Input Tray Pickup, Feed, and Separation Rollers . . . 2-16
2000-sheet Input Tray Paper Quantity Switch Assembly . . . . 2-18
2000-sheet Input Tray Paper Size Switch Assembly . . . . . . 2-18
2000-sheet Input Tray VTU . . . . . . . . . . . . . . . . . . . 2-20
2000-sheet Input Tray Tension Springs . . . . . . . . . . . . . 2-21
2000-sheet Input Tray Locating Pins . . . . . . . . . . . . . . 2-22
2000-sheet Input Tray Outriggers (Stabilizing Feet) . . . . . . 2-23
2000-sheet Input Tray Casters . . . . . . . . . . . . . . . . . . 2-24
2000-sheet Input Tray Adjustable Foot . . . . . . . . . . . . . 2-25
Multibin Mailbox Removal and Replacement . . . . . . . . . . . 2-26
Multibin Mailbox Orientation . . . . . . . . . . . . . . . . . . 2-26
Multibin Mailbox Front and Back Covers . . . . . . . . . . . . 2-27
Multibin Mailbox Top Cover . . . . . . . . . . . . . . . . . . . 2-28
Multibin Mailbox Power Supply . . . . . . . . . . . . . . . . . 2-29
Multibin Mailbox Paper Bins and Blind Cover . . . . . . . . . 2-30
Multibin Mailbox Flipper Assembly . . . . . . . . . . . . . . . 2-31
Multibin Mailbox Delivery Head Motor . . . . . . . . . . . . . 2-34
Multibin Mailbox Transport Belt Motor . . . . . . . . . . . . . 2-35
Multibin Mailbox Input Paper Guide . . . . . . . . . . . . . . 2-36
Multibin Mailbox Metal Tape and Housing Assembly . . . . . 2-38
Multibin Mailbox Controller PCA . . . . . . . . . . . . . . . . 2-40
Multibin Mailbox Anticurl Strings . . . . . . . . . . . . . . . . 2-42
Multibin Mailbox Delivery Head Assembly . . . . . . . . . . . 2-44
Multibin Mailbox Interlock Switch . . . . . . . . . . . . . . . 2-47
Multibin Mailbox Diagnostic LED PCA . . . . . . . . . . . . 2-48
Multibin Mailbox User Status LED PCA . . . . . . . . . . . . 2-50
Multibin Mailbox Adjustable and Fixed Casters . . . . . . . . 2-52
Multibin Mailbox Attachment Assembly . . . . . . . . . . . . 2-53
3 Troubleshooting
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Troubleshooting Approach . . . . . . . . . . . . . . . . . . . . . . 3-2
Print the Event Log . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Display the Event Log . . . . . . . . . . . . . . . . . . . . . . . 3-2
Interpret the Event Log . . . . . . . . . . . . . . . . . . . . . . . 3-3
Print a Configuration Page . . . . . . . . . . . . . . . . . . . . . 3-3
C-link Communication Cables . . . . . . . . . . . . . . . . . . . 3-6
Paper Path Test . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Messages Structure . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
2000-sheet Input Tray Standalone Diagnostics . . . . . . . . . . . 3-10
2000-sheet Input Tray Motor Test . . . . . . . . . . . . . . . . 3-10
2000-sheet Input Tray Standalone Running Test . . . . . . . . 3-11
2000-sheet Input Tray Sensor Test . . . . . . . . . . . . . . . . 3-11
2000-sheet Input Tray LED Status Interpretation . . . . . . . . 3-12
Multibin Mailbox Standalone Diagnostics . . . . . . . . . . . . . 3-13
Multibin Mailbox LEDs Description . . . . . . . . . . . . . . 3-13
Multibin Mailbox Standalone Diagnostic Test . . . . . . . . . . 3-14
Power-on Test . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
Multibin Mailbox Paper Path Test . . . . . . . . . . . . . . . . . 3-15
Multibin Mailbox LEDs Status Interpretation . . . . . . . . . . . 3-15
General Troubleshooting Information . . . . . . . . . . . . . . . . 3-19
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19
4 Parts
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
2000-sheet Input Tray Components . . . . . . . . . . . . . . . . . 4-3
Multibin Mailbox Components . . . . . . . . . . . . . . . . . . . . 4-7
Duplexer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11


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