Xerox PHASER 7500, Service Manual

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Phaser 7500 Printer Service Manual 4-3
General Troubleshooting
If the printer successfully prints the test print, replace the Image Processor Board.
If the printer fails to print a test print, troubleshoot the print engine starting with
the
“AC Power Troubleshooting” on page 4-13 .
System Startup
Listed here is a typical startup routine from a cold start. The printer requires
approximately 45 seconds to complete this sequence.
1. When the power switch is turned On, the ‘Health’ LED on the Image Processor
Board turns on immediately.
2. System RAM is tested. If an error is detected, RAM ERROR displays and one or
both of the Control Panel and Health LEDs alternately blink at 1/2 second
intervals.
3. The Boot Loader then loads and runs POST diagnostics.
4. POST turns off the Health LED.
5. POST checks the Control Panel.
6. POST checks the keypad buffer. If a shortcut has been selected, the printer
displays Processing Input and the shortcut executes. If a random button is
pushed, or there is an indication of a button press, Processing Input displays
and POST continues. If no buttons have been pushed, POST continues
execution.
7. The display is reset (addressable area turns “Gray”).
8. The Control Panel LED cycles: Green, Yellow, Red, and then Off.
9. The display backlight turns on (high intensity), with nominal contrast display.
10. The display area is turned on, dark black for 1 second.
11. The display is cleared.
12. The display backlight turns on with nominal intensity.
13. The POST Vn.nn message displays, and tests are quickly executed.
14. For Hard Faults, the display indicates the last test run and “CALL SERVICE”.
15. After the POST tests have successfully finished, the Xerox ‘splash screen’
displays on the Control Panel and PostScript begins initialization.
16. The Control Panel LED turns Green and the display reads Warming up - Please
wait.
17. The Control Panel LED turns Green and the display reads Ready to Print.