IBM RS/6000 SP, Maintenance Information

Page: 92 / 388

MAP 0160: Thin Processor Node Power
023 (continued)
– Using a digital multimeter, check for continuity from node tailgate N00-BH-J8 pin 1 to plug N00-NS-P110
pin 1. Check for continuity from node tailgate N00-BH-J8 pin 5 to plug N00-NS-J110 pin 2.
Is there continuity?
Yes No
024
– Check continuity between two tabs of processor node circuit breaker.
Is there continuity?
Yes No
025
Problem with circuit breaker.
– Replace processor node circuit breaker.
– Replug N00-NS-P110 at node supervisor card.
– Go to Step 031 to verify fix.
026
– Go to Step 029 to replace node power harness.
027
Possible problem with node supervisor card or node power harness inside processor node.
– Go to Step 028
028
– Using a digital multimeter, check for continuity between tailgate N00-NS-J110 pin 1 and pin 2.
Does the multimeter indicate an open condition?
Yes No
029
Problem with node power harness inside processor node.
– Replace the node power harness N00-NS-P110 inside this processor node.
– Reinstall processor node in frame.
– Go to Step 031 to verify fix.
030
– Replace the node supervisor card, taking care to replug all cables, including node power harness
N00-NS-P110.
– Go to Step 031 to verify fix.
031
– Remove processor node from service position.
– Reconnect all cables at rear of processor node.
– Put circuit breaker at front of processor node in the On (‘1’) position.
– Check Power (green) LED for an OFF position.
(Step 031 continues)
1-72
RS/6000 SP MAPs