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Phaser 8400/8500/8550/8560 Color Printer Service Manual 4-57
General Troubleshooting
c. Unplug power cord and remove printer's covers.
Caution
Use caution around motors, pulleys and live AC connections when
working with the printer covers off.
a. Unplug the following Electronics Module connections. This step
removes all other circuits so the Electronics Module can be tested
alone.
■ Power Control to I/O board (J800)
■ Power Control right (J400)
■ Preheater solenoid (interconnect cable)
■ Printhead tilt gear solenoid (interconnect cable)
■ Printhead data (J130)
■ Waveamp signal (J790)
■ Power Control left (J390)
■ Y-Axis motor (J280)
b. Plug in power cord and turn on power to the printer
c. If the PE and PS indicators do not flash momentarily, the short is
inside the Electronics Module. Replace the Electronics Module and
retest the printer. If PE and PS indicators flash, continue with debug.
d. Plug in all cables removed during service.
e. Trace through all service steps performed to reattach any cables that
were unplugged during debugging.
f. Attach printer covers.
g. Perform full test of printer.
4. Short circuit on 3.3 V power supply within the I/O board.
a. REQURIED: Follow all procedures from Step 3 before proceeding
with these steps. The I/O board needs to be isolated from other
systems in the printer to be effectively tested.
b. Turn off printer and wait 30 seconds for power supply capacitors to
discharge. Damage to circuits within the Electronics Module may
occur if the power supply capacitors are not allowed to fully.
c. Unplug the Control Panel connector (J220) on the I/O board. This
removes the Control Panel from the I/O board.
d. Plug in the Power Control to I/O board connector (J800). This step
adds the I/O board back to the working Electronics Module - nothing
else is connected.
e. Turn on power to the printer
5. If the PE and PS indicators do not flash momentarily, the short is on the I/
O board or related cabling. Skip the rest of this section if the PE and PS
indicators flash because the problem is elsewhere in the printer.
a. Verify short is on the I/O board by using an ohmmeter to check the
resistance on J270, pin 1 to ground. Resistance of less than 1K ohm
indicates a problem.
b. To isolate problem to I/O board or related cabling, unplug I/O board
connectors:
■ Umbilical Right J1
■ Waste Tray Sense J110
■ Stripper Solenoid J250
■ Paper Tray Sense J610
■ Front Door Sense J600