IBM 6C1 Service Manual page 96

Step 1540-17
The last FRU installed or one of its attached devices is probably defective.
1. Make sure the diagnostic CD-ROM is inserted into the CD-ROM drive.
2. Turn off the power and remove the power cords.
3. Starting with the last installed adapter, disconnect one attached device and cable.
4. Plug in the power cords and wait for OK on the operator panel display.
5. Turn on the power.
6. If the Console Selection screen is displayed, choose the system console.
7. After the keyboard indicator displays, press the F5 key on the directly attached
keyboard or the number 5 key on an ASCII terminal keyboard.
8. Enter the appropriate password if you are prompted to do so.
NO
YES
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Service Guide
Repeat this step until the defective device or cable is identified or all devices
and cables have been disconnected.
If all the devices and cables have been removed, then one of the FRUs
remaining in the system unit is defective.
To test each FRU, exchange the FRUs in the following order:
1. Adapter (last one installed)
2. System board (see notes on page 35)
3. Power supply
If the symptom did not change and all the FRUs have been exchanged, call
service support for assistance.
If the symptom has changed, check for loose cards, cables, and obvious
problems. If you do not find a problem, return to "Step 1540-1" on page 64 in
this MAP and follow the instructions for the new symptom.
The last device or cable that you disconnected is defective.
Exchange the defective device or cable.
Go to "MAP 0410: Repair Checkout" in the RS/6000 Eserver pSeries
Diagnostic Information for Multiple Bus Systems .