IBM B50 - Manual (Page 43)

DANGER
To prevent electrical shock hazard, disconnect the power cord from the
electrical outlet before relocating the system.
Step 1520-1
You may be directed to this MAP for several reasons:
1. There is no indication of activity when the power button on the operator panel is
pressed. The power LED does not come on and none of the fans, including the
fan in the power supply, start to turn.
Go to “Step 1520-2.”
2. When the power button on the operator panel is pressed, the system begins to
power on, but the power does not stay on.
Go to “Step 1520-2.”
Step 1520-2
1. Unplug the power cord from the Power Distribution Unit (PDU)/Power Distribution
Bus (PDB) and the power outlet.
2. Unplug the power cord from the PDU/PDB and the power supply.
3. Check that the power cord from the power outlet to the PDU/PDB has continuity.
4. Check that the power cord from the PDU/PDB to the power supply has
continuity.
5. Check that the power outlet has been wired correctly with the correct voltage.
6. Plug the power cord into the PDU/PDB and the power supply.
7. Plug the power cord into the PDU/PDB and the power outlet.
Did you find a problem?
NO Go to “Step 1520-3” on page 2-14.
YES Correct the problem. Go to " MAP 0410: Repair Checkout " in the
Diagnostics Information for Multiple Bus Systems.
Chapter 2. Maintenance Analysis Procedures (MAPs) 2-13