IBM RS/6000 SP, Maintenance Information

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MAP 0410: Supervisor Power 24 Volts DC Problem
MAP 0410: Supervisor Power 24 V dc Problem
Problem detected with supervisor power supply- 24 V dc:
Ÿ Main power switch LED is On
Ÿ
-AND- PDU rear panel LED is Off
Ÿ
-BUT- some frame supervisor LEDs are On.
Figure 1-23. PDU + 24 V dc Circuit Diagram
001
Problem with supervisor power supply- 24 V dc.
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 power section.
– Check all cables from 24 V dc supply for a problem such as a poor cable connection or open cable.
Do the cables and connections from the 24 V dc supply appear to be okay?
Yes No
002
– Fix cable problem. Reconnect ac and put main circuit breaker in the On (‘1’) position.
– Check PDU rear panel LED.
Is the PDU rear panel LED lit?
Yes No
003
Problem not resolved.
– Go to “MAP 0370: Main Power” on page 1-222.
004
Problem resolved.
– Go to “MAP 0570: End of Call” on page 1-357.
005
(Step 005 continues)
1-244
RS/6000 SP MAPs