IBM RS/6000 H50, Installation And Service Manual

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Step 1520-18
Remove all the cables from the PDB.
Is the light on the back of the Power Supply flashing?
NO Replace the PDB and go to "MAP 410: Repair Checkout" in Diagnostic
Information for Multiple Bus Systems.
YES Go to “Step 1520-19.”
Step 1520-19
Reattach the cables to the PDB 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 PDB is defective replace it and go
to "MAP 410: Repair Checkout" in
Diagnostic Information for Multiple Bus
Systems.
YES Attach the next cable.
Step 1520-20
Does the system appear to power on even though the operator is blank?
NO
1. Verify that all cables are connected correctly.
2. Go to “Step 1520-21” on page 2-23.
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.
2-22
RS/6000 Enterprise Server Model H50 Installation and Service Guide