IBM H Series Installation And Service Manual page 68

Step 1520-20
Remove all the cables from the Power Distribution Board.
Is the light on the back of the Power Supply flashing?
NO Replace the Power Distribution Board and go to "MAP 410: Repair
Checkout" in Diagnostic Information for Multiple Bus Systems.
YES Go to "Step 1520-21."
Step 1520-21
Reattach the cables to the Power Distribution Board one at a time. After attaching
each cable, reapply AC power and observe the light on the back of the power
supply.
Is the light on the back of the power supply flashing?
NO The last cable that was attached to the Power Distribution Board is defec-
tive, replace it and go to "MAP 410: Repair Checkout" in Diagnostic Infor-
mation for Multiple Bus Systems.
YES Attach the next cable.
Step 1520-22
Does the system appear to power on even though the operator panel is blank?
NO
1. Verify that all cables are connected correctly.
2. Go to "Step 1520-23" on page 2-35.
YES
1. Reseat the operator panel cable and retest.
2. Replace the operator panel control assembly. Be sure to remove the
VPD module from the old operator panel control assembly (connector
U2) and place it in the new one.
2-34
RS/6000 Enterprise Server Model H Series Installation and Service Guide