Rap 2.4: Power Supply Loading - Xerox 450c Service Manual

RAP 2.4: Power Supply
Loading
See Parts List 3.1
Low or out of specification voltages on a
power supply may be the result of a
problem elsewhere in the power
distribution system. This RAP will
isolate the problem to a known
subsystem on the WorkCentre 450c/
450cp.
1. Perform RAP 2.2: Power Supply
DC Voltage Check on page 2-12.
Result: Power supply readings are
within specification?
No: Disconnect the scanner motor
wiring harness from CN5. Go to
Step 2.
Yes: End of RAP. There is no
problem.
2. Perform the voltage checks given in
the Power Supply DC Voltage Check
RAP.
Result: Power supply readings are
within specification?
No: Disconnect the wiring harness
from connector OPE on the
scanner relay board. Go to Step 3.
Yes: There's a problem with the
scanner motor. Replace it, then
go back to step 1.
Xerox WorkCentre 450c/450cp Service Manual
3. Perform the voltage checks given in
RAP 2.2: Power Supply DC Voltage Check on page 2-12.
Result: Power supply readings are within specification?
No: Disconnect the wiring harness from connector CN3 on
the main board). Go to Step 4.
Yes: There's a problem with the control panel. Replace it,
then go back to step 1.
4. Perform the voltage checks given in
RAP 2.2: Power Supply DC Voltage Check on page 2-12.
Result: Power supply readings are
within specification?
No: Disconnect the two wiring harnesses CN10 and CN4
(main board to printer). Go to Step 5.
Yes: There's a problem with the scanner assembly.
Replace it, then go back to step 1.
5. Perform the voltage checks given in
RAP 2.2: Power Supply DC Voltage Check on page 2-12.
Result: Power supply readings are within specification?
No: Disconnect the wiring harness from the analog board
to the LCU (USA only) or unplug the LCU
(RX and France). Go to Step 6.
Yes: There's a problem with the printer.
Replace it, then go back to step 1.
6. Perform the voltage checks given in
RAP 2.2: Power Supply DC Voltage Check on page 2-12.
Result: Power supply readings are within specification?
No: Replace the main board (REP 5.1.2: Main Board on page 4-39).
Yes: End of RAP.
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