HP 4V/4MV MAINTENANCE KIT INSTRUCTIONS
The following parts are included in this maintenance kit: 1 Fusing Assembly 1 Separation Pad 1 MP Pickup Roller 1 Transfer Roller 2 Dual Pickup Roller RG5-1557 RF5-0302 RB1-1411 RG5-1410 RB1-1386
Please Note: Turn the printer off, unplug it, and allow it to sit for 30 minutes before performing these maintenance procedures.
This printer maintenance kit provides you with the parts most commonly used to rebuild HP LaserJet 4V/4MV printers. Using the HP LaserJet Printer Maintenance Kit helps you eliminate repeat service calls and maximize the paper feed and print quality performance of your laser printer. Recommended Maintenance Level: The parts included in this kit have a variable service life that is highly dependent upon printer applications, operating environment, user maintenance and the print media used. Any printer servicing should include inspection of the components, particularly in the presence of error messages and/or image defects. Caution: Please be sure to refer to your printer service manual for detailed instructions on how to remove and replace these printer parts. Fusing assembly removal and replacement The Fusing assembly is located on the upper portion of the printer door.
1). Remove the Transfer Roller Handle the Transfer Roller from the ends only. Do not touch the surface of the Transfer Roller. Skin oils will affect its electrical characteristics, resulting in poor image transfer. a). Grasp the shaft on either end of the Transfer Roller and lift upward to snap out of the plastic retainer clip (callout 1). b). Lift the opposite end up and out of its retainer clip.
To Reinstall: Be sure that the non-gear end of the shaft is to the right. Also make sure that the alignment slot (plastic tab) on the underneath side of the Transfer Roller slips over the locator pin (callout 2). CAUTION Do not remove two screws indicated in by the null symbol 2). Remove five machine shoulder screws (callout 3). a). Pull outward on the edges of the Front Door assembly to release the shaft (callout 4). b). Lift the Fusing assembly up and out.

To Reinstall:

CAUTION Make sure that the Protection Plate (callout 5) is in place or damage to the toner cartridge drum will occur. Cassette Pick Roller Removal 1) Remove top cover a. Open front door b. Remove two screws from right and left side of cover
c. Lift front of cover up slightly and push to the back until cover releases d. Disconnect display cable and remove cover 2) Remove right side cover a. Release one tab towards top of cover and remove cover. 1). The Cassette Pickup Roller assembly is located under the Cartridge Guide. The removal of this assembly requires prior removal of the top and right side covers and will require a stubby Phillips screwdriver. a). Remove Paper Cassette and Cartridge Guide. The Cartridge Guide is located directly under the toner cartridge and behind the Registration Rollers. Note that the removal of this guide does not require prior removal of the Upper Cover or any upper area assemblies. a); Using a stubby Phillips screwdriver, remove the two self-tapping screws (callout 6). b); Lift the front edge of the plate upward and slide it forward, out of the printer. Note that the plate fits tightly within the opening.

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b). From the right side of the printer, remove the pickup clutch alignment guide (callouts 7 & 8). Unplug and free the clutch cable.
c). Remove two small diameter, machine screws (callout 10). d). Tilt the roller shaft upward from the left end and lift out, being careful not to damage the cable.
Cassette Pickup Roller Assembly To Reinstall: e). Thread the Pickup Roller Clutch Cable underneath the MP Drive Gears on the right end while sliding the shaft into position. CAUTION The next step is very important. If the clutch is not aligned properly, Paper will not feed. f). Be certain to align the alignment tabs with the notch on both the registration roller clutch and the pickup roller clutch. g). Align the plastic bearing retainers on each end of the shaft so the flat portion is facing upward in proper position for the mounting screws. MP Pickup Roller Removal a). Pinch clip on left side of roller and slide to the left to remove. Separation Pad Removal b. Use a small flat blade screwdriver to pry firmly upward at either end of the separation pad.

Service Manual

For the complete PDF manual please visit www.LaserPros.com.
HP LaserJet 4V / 4MV (C3141A / C3142A)
Copyright Hewlett-Packard Company 1994 All Rights Reserved. Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright laws. Publication number C3141-90929 First edition, July 1994 Printed in USA
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 damaged 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.
Hewlett-Packard Company 11311 Chinden Boulevard Boise, Idaho 83714

Conventions

This manual uses the following conventions: 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. COMPUTER type indicates text as seen on a computer monitor. [Keyface] indicates keys on a computer keyboard or on the printer control panel. Examples include [Form Feed] , [Enter] and [On Line]. 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!

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