HP LaserJet 4V and 4MV Printer Service Guide, C3141 90929 English (EN)

Service Manual HP LaserJet 4V / 4MV (C3141A / C3142A)

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© Copyright Hewlett-Packard Company 1994 Warranty WARNING The information contained in this document is subject to change without notice. Electrical Shock Hazard All Rights Reserved. Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright laws. To avoid electrical shock, use only supplied power cords and connect only to properly grounded (3-hole) wall outlets. 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.

Publication number C3141-90929 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. First edition, July 1994 Printed in USA Hewlett-Packard Company 11311 Chinden Boulevard Boise, Idaho 83714

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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 Notes contain important information set off from the text.

CAUTION Caution messages alert you to the possibility of damage to equipment or loss of data. WARNING! Warning messages alert you to the possibility of personal injury. i

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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

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