Xerox Phaser 8400-8500-8550-8560 Service Manual

Xerox Phaser 8400-8500-8550-8560 Service Manual

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.

Power Safety Precautions

Power Source

For 115 VAC printers, do not apply more than 135 volts RMS between the supply conductors or between either supply conductor and ground. For 230 VAC printers, do not apply more than 254 volts RMS between the supply conductors or between either supply conductor and ground. Use only the specified power cord and connector. This manual assumes that the reader is a qualified service technician.

Plug the three-wire power cord (with grounding prong) into a grounded AC outlet only. If necessary, contact a licensed electrician to install a properly grounded outlet. If the product loses its ground connection, contact with conductive parts may cause an electrical shock. A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation.

Disconnecting Power


The power switch does not completely de-energize the printer. You must also disconnect the power cord from the printer’s AC inlet. Disconnect the power cord by pulling the plug, not the cord.

Disconnect the power cord in the following cases:

  • if the power cord or plug is frayed or otherwise damaged,
  • if any liquid or foreign material is spilled into the product,
  • if the printer is exposed to any excess moisture,
  • if the printer is dropped or damaged,
  • if you suspect that the product needs servicing or repair,
  • whenever you clean the product.

Electrostatic Discharge (ESD) Precautions

Some semiconductor components, and the respective sub-assemblies that contain them, are vulnerable to damage by Electrostatic discharge (ESD). These components include Integrated Circuits (ICs), Large-Scale Integrated circuits (LSIs), field-effect transistors and other semiconductor chip components. The following techniques will reduce the occurrence of component damage caused by static electricity. Be sure the power is off to the chassis or circuit board, and observe all other safety precautions.

  • Immediately before handling any semiconductor components assemblies, drain the electrostatic charge from your body. This can be accomplished by touching an earth ground source or by wearing a wrist strap device connected to an earth ground source. Wearing a wrist strap will also prevent accumulation of additional bodily static charges. Be sure to remove the wrist strap before applying power to the unit under test to avoid potential shock.
  • After removing a static sensitive assembly from its anti-static bag, place it on a grounded conductive surface. If the anti-static bag is conductive, you may ground the bag and use it as a conductive surface.
  • Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage some devices.
  • Do not remove a replacement component or electrical sub-assembly from its protective package until you are ready to install it.
  • Immediately before removing the protective material from the leads of a replacement device, touch the protective material to the chassis or circuit assembly into which the device will be installed.
  • Minimize body motions when handling unpacked replacement devices. Motion such as your clothes brushing together, or lifting a foot from a carpeted floor can generate enough static electricity to damage an electro-statically sensitive device
  • Handle IC’s and EPROM’s carefully to avoid bending pins.
  • Pay attention to the direction of parts when mounting or inserting them on Printed Circuit Boards (PCB’s).

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.

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