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Step 1520-4
Note: Either the power supply, the system board, or the power switch is defective.
To test each FRU, exchange the FRUs that have not already been exchanged in the
following order.
Power supply
Power Switch
System board (See notes on 2-1.)
1. Turn the power off.
2. Unplug the system unit power cable from the wall outlet.
3. Exchange one of the FRUs in the list.
4. Connect the system unit power cable to the wall outlet.
5. Turn the power on.
Does the fan in the power supply turn on and the power LED come on and stay
on?
NO Reinstall the original FRU.
Repeat this step until the defective FRU is identified.
YES Go to "Map 0410: Repair Checkout" in the Diagnostics Information for
Multiple Bus Systems.
2-18 7043 43P Series Service Guide