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HP LaserJet 5L and 6L Printer Service Manual Service Manual HP LaserJet 5L (C3941A) HP LaserJet 6L (C3990A) © Copyright Hewlett-Packard Company 1997 All Rights Reserved. Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright laws. Publication number C3990-90991 First edition, May 1997 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. Note Caution WARNING! 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. iii 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 and care. 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. A 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 Regulatory Information Here are required statements regarding RFI and laser saf