IBM RS/6000 SP, Maintenance Information

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MAP 0400: Supervisor Power 12 Volts DC Problem
There is some 12 V dc power in the frame.
– Go to Step 005 on page 1-15 to check frame supervisor.
005
No 12 V dc supervisor power available. LEDs on frame supervisor card and node supervisor cards do not
light.
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 ac and dc power sections.
– Check connection of cable PDU-FC-P402 at connector card.
– If cable PDU-FC-P402 was already seated properly, disconnect cable PDU-FC-P402 at connector card
and check continuity of cable between PDU-FC-P402 and 12 V dc supervisor power supply.
Does the cable appear okay and show continuity?
Yes No
006
– Fix cable PDU-FC-P402 problem. If necessary, to replace this cable, replace the entire PDU.
– Go to Step 044 on page 1-242 to verify fix.
007
– Using a multimeter, check resistance between connector card PDU-FC-J402 pin 1 and pin 2.
Is the resistance less than 5.0 ohms?
Yes No
008
– Check all cables from a 12 V dc supply for a problem such as a poor cable connection or open
cable.
Do the cables and connections from the 12 V dc supply appear to be okay?
Yes No
009
– Fix or replace cable as necessary.
– Go to Step 044 on page 1-242 to verify fix.
010
– For RS/6000 SP frames, replace the +12 V dc supervisor power supply.
– For 9076 SP1 frames, replace supervisor power supply.
– Reinstall covers over Power Distribution Unit ac and dc sections.
– Reconnect ac and put the main circuit breaker in the On (‘1’) position.
Do any frame supervisor LEDs light?
Yes No
011
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RS/6000 SP MAPs