Xerox Phaser 8400 Service Manual page 214

r.
If no error code displays, return the original Control Panel and I/O board to
the printer. Replace the electronics module and then continue with the next
steps of the procedure.
s. If a different error code is displayed, see the "Fault Code Error Message
Troubleshooting" on page 3-9 for a definition of the problem and the
procedures needed to solve the problem.
2. Repeat the following procedures to check all circuits connected to the I/O board:
a.
Turn off printer and wait 30 seconds for power supply capacitors to
discharge.
b. Plug in the following connectors, one at a time, and perform steps C and D
for each connector.
c. Turn on printer and wait for the error code 34,001.43. Check that the three
voltage indication LEDs INSIDE the electronics module (visible through the
vent holes of the electronics module near the AC power switch) are lit.
d.
If the proper error code and LED doesn't appear after each I/O connector is
reconnected, repair or replace the faulty circuit.
e. If the proper code appears, repeat the procedures until all I/O board
connectors are plugged back in.
f.
If repairs are made during this step, plug in all connectors to printer and
retest. If printer is fixed, reattach covers to printer and perform a full test. If
no defects are found in this step, continue with next step.
3.
The proper error code is displayed, repeat the following procedures to check all
circuits connected to the electronics module:
a. Turn off printer and wait 30 seconds for power supply capacitors to
discharge.
b. Plug in the following connectors, one at a time, and perform steps C and D
for each connector.
c.
Turn on printer and wait for the error code 34,001.43. Check that the three
voltage indication LEDs INSIDE the electronics module (visible through the
vent holes of the electronics module near the AC power switch) are lit.
d. If the proper error code and LED doesn't appear after each I/O connector is
reconnected, repair or replace the faulty circuit.
e.
If the proper code appears, repeat the procedures until all I/O board
connectors are plugged back in.
f.
If repairs are made during this step, plug in all connectors to printer and
retest. If printer is fixed, reattach covers to printer and perform a full test. If
no defects are found in this step, replace electronics module, test printer,
reattach covers to printer and perform a full test.
Verifying Print Engine Operation by Printing a Built-in Page.
1. If not already on, turn on the printer. If the printer does not begin initializing, go
to the topic, "Measuring AC Power Supply Voltages" on page 4-75.
2. Once the Power light is on (not blinking) and the Control Panel displays Ready
to Print it is now possible to print any built-in pages.
3.
If the printer prints the Page, the print engine is working correctly. If the printer
does not print the Page, then a problem exists with the print engine.
4-74 Phaser 8400/8500/8550 Color Printer