Miscellaneous Electrical Troubleshooting - Xerox Phaser 8400 Service Manual

Miscellaneous Electrical Troubleshooting

The electronics module contains the Power Supply, Image Processor board and the
Power Control board. If a component of the electronics module fails, and service is
necessary, the entire electronics module is replaced as a unit - no individual board
troubleshooting is needed. The printer contains many self test routines to aid in
diagnosing problems.
Note
If the printer encounters certain fault conditions, the printer may reboot up to
three times before displaying an error code - this is an attempt to correct the
problem and reduce the number of unnecessary service calls.
Following the suggested debug procedures in the specified sequence generally
provides better test coverage than performing tests in a different order.
Error Message Displayed on Front Panel LCD
Printer has detected a fault condition.
1.
See "Fault Code Definitions and Troubleshooting" on page 3-8 for definitions
and solutions.
LCD Is Blank and the PS and PE Indicators Are Flashing an Error Code
Printer has detected a fault condition but can't display a message on the LCD.
Some portion of the chain of devices used to drive the LCD may be defective
since an error message is not displayed.
1.
See "Fault Code Definitions and Troubleshooting" on page 3-8 for definitions
and solutions.
Printer Fails to Power-Up: PS, PE and the 3.3 V Indicator LEDs Are Not
Illuminated
1.
Printer is not receiving proper AC.
Note
Use caution with hazardous voltages when diagnosing AC problems. The 3.3
V LED is located INSIDE the electronics module and must be observed
through the vent holes close to the AC power switch, see the illustration on
page 4-65.
a.
Inspect the power cord.
b. Verify AC outlet voltage and current capacities are within specifications.
c. If necessary, move the printer to a different outlet and retest.
Service Manual 4-55