Xerox WorkCentre M20 Service Manual page 43

1.1 Power Failure RAP
Use this RAP to identify the cause of a power supply failure.
Procedure
WARNING
Switch off the electricity to the machine. Disconnect the power cord from the customer
supply while performing tasks that do not need electricity. Electricity can cause death or
injury. Moving parts can cause injury.
WARNING
Take care when measuring AC mains (line) voltage. Electricity can cause death or injury.
NOTE: If necessary, refer to GP 20 for the acronym list and cross reference lists of more com-
monly recognised part names.
NOTE: Throughout this procedure, where further steps require the reconnection of a compo-
nent, ensure they are reconnected before performing the next step.
Refer to Wiring Diagram 1, Wiring Diagram 2, Wiring Diagram 3 and Wiring Diagram 4. Per-
form the following:
1. Ensure the supply voltage is correct. If possible, connect the machine to a known good
power supply. If the original power supply is faulty, inform the customer.
2. Disconnect the power cord from the power outlet and the machine. Check the continuity
of the power cord. If necessary, install a new power cord, PL 1.10 Item 20.
3. Disconnect the inline connector between the CBF harness - inlet, PL 1.10 Item 8 and the
CBF power switch grey, PL 1.10 Item 3. Measure the AC supply voltage between pins 1
and 2 on the inline connector. Repair the wiring as necessary.
4. Disconnect CON1 on the SMPS + HVPS. Measure the AC supply voltage between pins 1
and 3 on the connector. If necessary, install a new CBF power switch grey, PL 1.10 Item
2.
5. Check the voltages at both sides of the fuses on the SMPS + HVPS:
• Fuse F1 - 110V (NASG) or 220/240V (XE).
• Fuse F2 - 110V (NASG) or 220/240V (XE).
• Fuse F3 - 5VDC.
If necessary, install a new SMPS + HVPS, PL 1.10 Item 1.
NOTE: Fuses F1, F2 and F3 are not spared.
6. Switch off the power to the machine. Disconnect all harnesses on the SMPS + HVPS,
other than CON1 and CON101.
7. Switch on the power to the machine. If the machine switches on, perform step 8. If the
machine fails to switch on, perform step 9.
8. Sequentially reconnect each connector onto the SMPS + HVPS. When the faulty circuit
has been identified, repair the wiring or install components as necessary.
9. Reconnect all connectors to the SMPS + HVPS. Disconnect all connectors on the PBA
main, PL 1.10 Item 9. Sequentially reconnect each connector onto the PBA main. If the
faulty circuit is identified, repair the wiring or install components as necessary. If the
machine still fails to switch on, install the following components as necessary:
• CBF harness - power + HVPS, PL 1.10 Item 3.
• PBA main, PL 1.10 Item 9
Work Centre M20 Family
10. If the fault is still present, install a new SMPS + HVPS, PL 1.10 Item 1.
March 2004
2-3
Status Indicator RAPs
1.1