IBM RS6000 Service Guide - Page 44

Step 1520-3 Note: Either the cooling fans, the power supply, the I/O planar, service processor, or the system card is defective. To test each FRU, exchange the FRUs that have not already been exchanged in the following order. Verify that the fan jumper is connected to connector J55. Power supply I/O planar Service Processor System card Front cooling fans (one at a time) 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 or all the FRUs have been exchanged. If the symptom did not change and all the FRUs have been exchanged, go to "Step 1520-4" on page 2-15. YES Go to "MAP 410: Repair Checkout" in the IBM RS/6000 Diagnostic Information for Multiple Bus Systems. 2-14 Service Guide