4-2 Phaser 7750 Printer Service Manual
Introduction
This chapter covers the general startup, PostScript, and power supply operations of
the printer to aid in troubleshooting problems not associated with an error code or
front panel error message.
For troubleshooting problems associated with an error code or front panel error
message, see "Error Messages and Codes" on page 3-1.
Troubleshooting procedures isolate a problem to a specific component or
subassembly, in some cases including the wiring harness.
Service Diagnostics
The Phaser 7750 Color Laser Printer has built-in diagnostics that allow access to
sensors, turning on and off motors, clutches, solenoids, built-in test patterns, cleaning
maintenance operations, printer status and some NVRAM access. Using these tests,
the service technician should be able to diagnose problems quickly and isolate which
component or sub assembly part needs replacement.
Service diagnostics are to be executed through the front panel by a certified service
technician only. Service Diagnostics can be entered one of two ways:
Entering Service Diagnostics by Reboooting the Printer:
1. Turn the printer power OFF.
2. Hold down the Back and Information buttons simultaneously and turn the
printer back ON.
3. Continue to hold the buttons until the following message is displayed on the front
panel: Service Diagnostics V#.##, Initializing..., and then release the
buttons.
4. The front panel displays the Service Diagnostics Menu.
■ You can print a Service Diagnostics Menu Map by highlighting Print
Service Diagnostics Menu, and pressing OK.
■ The printer will now run through POST and return to Ready.
■ You will need to re-enter service diagnostics.
Entering hidden service menu without rebooting the printer
1. Scroll to the Troubleshooting --> Service Tools --> Printer Status Page
menu.
2. Hold down the Up and Down buttons simultaneously.
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