IBM RS/6000 SP, Maintenance Information

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MAP 0430: DC Power Loss from Bulk DC Power Supply(s)
Does the good supply give the same indication?
Yes No
026
Original bulk dc power supply is bad.
– Replace the original bulk dc power supplies.
– Go to Step 001 on page 1-250 to verify fix.
027
DANGER
High voltage present. Perform “Lockout/Tagout Procedure for PDU” on page 1-2 or
“Lockout/Bagout Procedure for PDU” on page 1-3 to remove primary power to the frame.
– Open Power Distribution Unit dc section.
– Check the following two point-to-point connections between 48 V power chassis and connector card for
an obvious problem such as a poor connection or a damaged cable:
Ÿ Cable PDU-FC-P403 to ADC-BH-P1
Ÿ Cable PDU-FC-P404 to ADC-BH-P2
– Check for an obvious short between the +48 V and +48 VRtn busbars.
Do the cables and connection appear okay?
Yes No
028
– Fix the obvious problem.
– Go to Step 038 on page 1-255 to verify fix.
029
Bulk dc power supplies A and B share the same cable, while bulk dc power supplies C and D share a
different cable.
A. B: Cable PDU-FC-P403 to ADC-BH-P1
C, D: Cable PDU-FC-P404 to ADC-BH-P2
Is the ac problem or “dc Power Loss” (red) indication limited to a single supply or both supplies
on a single cable?
Yes No
030
– Problem is in one of the following components:
1. Frame supervisor card. (Can be done with system powered on.)
2. Connector card
3. Backplane card
– Replace components one by one, powering off system (except where indicated) to replace the
component, then powering on the system (where necessary) and checking the system monitor for
the “dc Power Loss” cleared (green instead of red) condition.
(Step 030 continues)
1-254
RS/6000 SP MAPs