IBM RS6000 - 7026 - H70 Service Manual

Also see for RS/6000 7025 F50 Series: User guide Service guide Service guide

Step 1520-41. Turn the power off.2. Unplug the system unit power cable from the wall outlet.3. Record the slot numbers of all the ISA and PCI adapters. Label and record thelocation of any cables attached to the adapters. Remove all the adapters.4. Remove all installed memory cards.5. Remove the CPU card(s).6. Unplug the power cables from all the SCSI devices.7. Unplug all the fans, except the fan in the power supply.8. Connect the system unit power cable to the wall outlet.9. Turn the power on.Does the fan in the power supply turn on and the power LED come on and stayon?NO Replace the I/O planar. Go to "MAP 410: Repair Checkout" in theIBMRS/6000 Diagnostic Information for Multiple Bus Systems.YES Go to “Step 1520-5” on page 2-16.Chapter 2. Maintenance Analysis Procedures 2-15