HP LaserJet 4V 4MV printer Service Manual

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Chapter Descriptions
1 Product Information
Orientation to the printer, as well as the service and repair philosophy is discussed. Information on obtaining assistance and warranty is also here.

2 Site Requirements
Here are recommendations pertaining to installation requirements.

3 Operating Overview
This chapter has detailed information about the Control Panel. Sample self tests and printer reset information are also included.

4 Maintenance
Turn to this chapter for information about printer cleaning.

5 Functional Overview
Here you will find the basic theory-of-operation information required to understand the various printer systems and how they function together.

6 Removal and Replacement
This chapter contains the step-by-step procedures for replacing printer field replaceable units (FRUs). Assemblies are grouped by location in the printer.

7 Troubleshooting
Diagnose printer problems here. Preliminary troubleshooting table is followed by error messages, image defect samples, and diagnostic tools.

8 Parts and Diagrams
Look here to find any field replaceable unit (FRU) in the printer. Exploded view drawings are accompanied by complete part number tables.

A Parts Index
All parts are sorted and cross-referenced here by part number and name.

B I/O Information
This appendix contains cabling and pin-out information for parallel and LocalTalk interfaces which are supported by the printer.

C Regulatory Information
Here are required statements regarding RFI and laser safety.

Subject Index
Use the subject index to quickly locate any information in the manual. ii

List of Figures
Figure 1-1 Figure 1-2 Figure 1-3 Figure 1-4 Figure 1-5 Figure 1-6 Figure 1-7 Figure 2-1 Figure 3-1 Figure 3-2 Figure 3-3 Figure 3-4 Figure 5-1 Figure 5-2 Figure 5-3 Figure 5-4 Figure 5-5 Figure 5-6 Figure 5-7 Figure 5-8 Figure 5-9 Figure 5-10 Figure 5-11 Figure 5-12 Figure 5-13 Figure 5-14 Figure 5-15 Figure 6-1 Figure 6-2 Figure 6-3 Figure 6-4 Figure 6-5 Figure 6-6 Figure 6-7 Figure 6-8 Figure 6-9 Figure 6-10 Figure 6-11 Figure 6-12 Figure 6-13 Figure 6-14 Figure 6-15 Figure 6-16 Sample Model and Serial Number Labels . . Front and Rear Side View . . . . . . . . . . Rear and Left Side View . . . . . . . . . . . Front View with Front Cover Open . . . . . Internal Assembly Locations (1 of 2) . . . . . Internal Assembly Locations (2 of 2) . . . . . Sample 5% Page Coverage . . . . . . . . . . Printer Space Requirements . . . . . . . . . Control Panel Layout . . . . . . . . . . . . . Service Mode Menus . . . . . . . . . . . . . Self Test Printout (printed in Service Mode) Engine Test . . . . . . . . . . . . . . .
. . . Printer Functional Block Diagram . . . . . . Power Supply/Power Distribution . . . . . . Formatter PCA Block Diagram . . . . . . . EconoMode vs Normal Mode . . . . . . . . . Image Formation Block Diagram . . . . . . Photosensitive Drum . . . . . . . . . . . . . Drum Cleaning . . . . . . . . . . . . . . . . Primary Charging Roller . . . . . . . . . . . Image Writing . . . . . . . . . . . . . . . . . Image Development . . . . . . . . . . . . . . Image Transferring . . . . . . . . . . . . . . Image Fusing . . . . . . . . . . . . . . . . . Paper Path . . . . . . . . . . . . . . . . . . Clutches and Sensors . . . . . . . . . . . . . General Timing Diagram . . . . . . . . . . . Phillips vs. Posidriv Screwdrivers . . . . . . Removing the Control Panel . . . . . . . . . Upper Cover . . . . . . . . . . . . . . . . . . Static Charge Eliminator . . . . . . . . . . . Removing Side Covers . . . . . . . . . . . . Removing Rear Cover . . . . . . . . . . . . . Exhaust Fan . . . . . . . . . . . . . . . . . High Voltag
e Power Supply PCA . . . . . . Cassette Size Sensor Assembly . . . . . . . Card Cage . . . . . . . . . . . . . . . . . . . Rear Exhaust Fan . . . . . . . . . . . . . . Power Supply Unit . . . . . . . . . . . . . . DC Controller PCA . . . . . . . . . . . . . . Laser/Scanner Assembly . . . . . . . . . . . Main Motor . . . . . . . . . . . . . . . . . . Main Drive Assembly Removal (1 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 . 1-11 . 1-12 . 1-13
. 1-14 . 1-15 . 1-17 . 2-4 . 3-3 . 3-16 . 3-21 . 3-22 . 5-3 . 5-4 . 5-10 . 5-12 . 5-17 . 5-18 . 5-19 . 5-20 . 5-21 . 5-22 . 5-23 . 5-24 . 5-25 . 5-26 . 5-29 . 6-4 . 6-8 . 6-9 . 6-10 . 6-11 . 6-12 . 6-13 . 6-14 . 6-15 . 6-16 . 6-17 . 6-18 . 6-19 . 6-20 . 6-21 . 6-22 iii

Figure 6-17 Figure 6-18 Figure 6-19 Figure 6-20 Figure 6-21 Figure 6-22 Figure 6-23 Figure 6-24 Figure 6-25 Figure 6-26 Figure 6-27 Figure 6-28 Figure 6-29 Figure 6-30 Figure 6-31 Figure 6-32 Figure 6-33 Figure 6-34 Figure 6-35 Figure 6-36 Figure 6-37 Figure 6-38 Figure 7-1 Figure 7-2 Figure 7-3 Figure 7-4 Figure 7-5 Figure 7-6 Figure 7-7 Figure 8-1 Figure 8-2 Figure 8-3 Figure 8-4 Figure 8-5 Figure 8-6 Figure 8-7 Figure 8-8 Figure 8-9 Figure 8-10 Figure 8-11 Figure B-2 Figure B-3 Figure B-4 Figure B-5 Figure C-1

Main Drive Assembly Removal (2 of 2) . . . . . . . . . . . Drum Drive Assembly . . . . . . . . . . . . . . . . . . . . Transfer Roller Assembly . . . . . . . . . . . . . . . . . . Fusing Assembly . . . . . . . . . . . . . . . . . . . . . . . Fuser Inlet Guide . . . . . . . . . . . . . . . . . . . . . . . Paper Guide Plate Assembly . . . . . . . . . . . . . . . . . MP Guide Plate . . . . . . . . . . . . . . . . . . . . . . . . MP Drive Gears . . . . . . . . . . . . . . . . . . . . . . . Fuser Door . . . . . . . . . . . . . . . . . . . . . . . . . . MP Tray . . . . . . . . . . . . . . . . . . . . . . . . . . . Front Door Assembly . . . . . . . . . . . . . . . . . . . . . Upper and Lower Delivery Roller Assemblies . . . . . . . Delivery Gear Assembly . . . . . . . . . . . . . . . . . . . Cartridge Guide . . . . . . . . . . . . . . . . . . . . . . . Cassette Pickup Roller Assembly . . . . . . . . . . . . . . Separation Pad . . . . . . . . . . . . . . . . . . . . . . . . Registration Roller (1 of 2) . . . . . . .
. . . . . . . . . . . Registration Roller (2 of 2) . . . . . . . . . . . . . . . . . . Registration Roller Guide Plate . . . . . . . . . . . . . . . Anti-Static Brush . . . . . . . . . . . . . . . . . . . . . . . Paper Guide . . . . . . . . . . . . . . . . . . . . . . . . . Left Side Foot . . . . . . . . . . . . . . . . . . . . . . . . . Paper Path and Components . . . . . . . . . . . . . . . . Engine Test Button and Printout . . . . . . . . . . . . . . Repetitive Image Defect Ruler . . . . . . . . . . . . . . . . DC Controller Inputs . . . . . . . . . . . . . . . . . . . . . DC Controller Outputs (1 of 2) . . . . . . . . . . . . . . . . DC Controller Outputs (2 of 2) . . . . . . . . . . . . . . . . Main Wiring Diagram . . . . . . . . . . . . . . . . . . . . Major Assembly Locations . . . . . . . . . . . . . . . . . . Covers and Doors . . . . . . . . . . . . . . . . . . . . . . . Foot Assemblies . . . . . . . . . . . . . . . . . . . . . . . Front Door Components (Page 1 of 2) . . . . . . . . . . . . Front D
oor Components (Page 2 of 2) . . . . . . . . . . . . Output Components . . . . . . . . . . . . . . . . . . . . . Internal Components (Page 1 of 4) . . . . . . . . . . . . . Internal Components (Page 2 of 4) . . . . . . . . . . . . . Internal Components (Page 3 of 4) . . . . . . . . . . . . . Internal Components (Page 4 of 4) . . . . . . . . . . . . . Card Cage Assembly . . . . . . . . . . . . . . . . . . . . . Connecting to the END of a LocalTalk Network . . . . . . Connecting to the MIDDLE of a LocalTalk Network (1 of 2) Connecting to the MIDDLE of a LocalTalk Network (2 of 2) I/O Connector Locations . . . . . . . . . . . . . . . . . . . VCCI Statement (Japan) . . . . . . . . . . . . . . . . . . .

6-23 6-24 6-25 6-26 6-27 6-28 6-29 6-30 6-31 6-32 6-33 6-34 6-35 6-36 6-37 6-38 6-39 6-40 6-41 6-42 6-43 6-44 7-4 7-31 7-36 7-38 7-39 7-40 7-41 8-9 8-10 8-12 8-14 8-16 8-18 8-20 8-22 8-24 8-26 8-28 B-2 B-3 B-3 B-4 C-4

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