x Phaser 8400/8500/8550/8560 Color Printer Service Manual
Manual Organization
The Phaser 8400/8500/8550/8560 Color Printer Service Manual is the 
primary document used for repairing, maintaining, and troubleshooting the 
printer. Use this manual as your primary resource for understanding the 
operational characteristics of the printer and all available options. This manual 
describes specifications, theory, and the diagnosis and repair of problems 
occurring in the print engine and attached options. Also included are detailed 
replacement procedures, parts lists, and wiring diagrams.
The Phaser 8400/8500/8550/8560 Color Printer Service Manual contains 
these sections:
Introductory, Safety, and Regulatory Information: This section contains important 
safety information and regulatory requirements.
Section 1 - General Information: This section contains an overview of the 
printer’s operation, configuration, specifications, and consumables.
Section 2 - Theory of Operation: This section contains detailed functional 
information on print engine components.
Section 3 - Error Codes and Messages: This section provides detailed 
troubleshooting procedures for error messages and codes generated by 
resident diagnostics. 
Section 4 - General Troubleshooting: Troubleshooting discussions cover the 
operation of Power On Self Test (POST), Service Diagnostics, In addition, this 
section includes troubleshooting methods for situations where no error 
indicator is available. 
Section 5 - Print-Quality Troubleshooting:  This section focuses on techniques to 
correct image quality problems associated with printer output.
Section 6 - Adjustments and Calibrations: This section provides procedures for 
the adjustment of print engine components.
Section 7 - Cleaning and Maintenance: This section provides periodic cleaning 
procedures for the printer.
Section 8 - Service Parts Disassembly: 
This section contains removal 
procedures for spare parts listed in the Parts List. A replacement procedure is 
included when necessary. 
Section 9 - Parts List: This section contains exploded views of the print engine 
and option FRUs, as well as part numbers for orderable parts.
Section 10 - Wiring Diagrams: This section contains the plug/jack locations and 
the wiring diagrams for the print engine.
Appendix A - Reference: This section provides an illustration of the printer’s 
menu structure, a listing of printer status codes, and a list of Service 
Diagnostics tests.