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Service Manual HP LaserJet 8000 (C4085A) HP LaserJet 8000 N (C4086A) HP LaserJet 8000 DN (C4087A) HP LaserJet Mopier 240 (C4228A)
© Copyright Hewlett-Packard Company 1998 All Rights Reserved. Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright laws. Publication number C4085-91087 First edition, November 1998 Warranty WARNING The information contained in this document is subject to change without notice.
Conventions This manual uses the following conventions: The names of major printer parts and assemblies are Capitalized. Color is used to emphasize items which are important to the material under discussion. 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 Notes contain important information set off from the text.
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.
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.
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Table of Contents 1 Product Information Printer Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Paper Capacities and Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 Model and Serial Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Material Safety Data Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38 Environmental Conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39 Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40 Safety Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42 Laser Safety Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42 Canadian DOC Regulations . . . . . . . . . . . . . . . . . . . . .
4 Maintenance and Adjustments Cleaning the Printer and Accessories . . . . . . . . . . . . . . . . . . . . . .82 Cleaning Spilled Toner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84 Preventative Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85 Tray Adjustment Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86 Tray 4 (2000-sheet Input Tray) Adjustment Procedure . . . . . . . . .88 5 Functional Overview Printer Functional Block Diagram . . . . . .
Main Functional Cycles of the Stapler (Internal Paper Path) . . . . . . . . . . . . . . . . . . . . . . . . . . .141 Communication Link (Daisy Chain). . . . . . . . . . . . . . . . . . . .142 Paper Jam Detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .144 Printer Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .144 IEEE 1284 Parallel Cable Information. . . . . . . . . . . . . . . . . . . . .
2000-sheet Input Tray Removal and Replacement. . . . . . . . . . .231 Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .232 Front Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .233 Back Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .234 Left Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .235 Right Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Controller PCA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .304 Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .305 Right Door Assembly (Paper Path Cover) . . . . . . . . . . . . . .306 Face-down Bins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .310 Empty Bin Sensor PCA. . . . . . . . . . . . . . . . . . . . . . . . . . . . .313 Full Bin and Interlock Sensor PCA . . . . . . . . . . . . . . . . . . . .315 LED PCA. . . . . . . .
7 Troubleshooting Troubleshooting Process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .376 Printer and Paper-Handling Troubleshooting Process . . . . .378 Troubleshooting the Printing System . . . . . . . . . . . . . . . . . . . . .380 Preliminary Operating Checks . . . . . . . . . . . . . . . . . . . . . . .380 General Troubleshooting Information . . . . . . . . . . . . . . . . . . . . .381 Miscellaneous Problems and Solutions . . . . . . . . . . . . . . . .381 Paper Curl. . . . . . . . . .
Printer Parts and Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . .512 Paper-Handling Devices Parts and Diagrams. . . . . . . . . . . . . . .524 Input Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .524 Output Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .532 Alphabetical Parts List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .544 Numerical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
