IBM RS/6000 SP, Maintenance Information

Page: 153 / 388

MAP 0260: 604 or 604e High Node Power
024 (continued)
Is the green LED 1 on any other processor node On or Flashing?
Yes No
025
– Go to “MAP 0370: Main Power” on page 1-222.
026
– Check all other processor nodes on the same dc power harness as the failing processor node to check
for the same symptom - circuit breaker on but green LED 1 not lit.
Is this the only processor node showing this symptom?
Yes No
027
Problem with 48 V dc power distribution.
– Go to “MAP 0480: Open in 48 V dc Distribution” on page 1-283.
028
– Check the cable connections at the power supplies, at the circuit breaker(s) behind CB panel below high
node (and at the four 48-volt power distribution connection).
Are there a good connection?
Yes No
029
– Fix cable connection problem.
– Go to Step 022 on page 1-132.
030
– Put circuit breakers CB01 and CB02 in the “on” (1) position.
– Check for 48 volts present at the high node power supply cable end(s) P1 and P2 (if N+1 power is
present) in the rear of the node. Measure the voltage between either pin 1, pin 2, or pin 3 and either pin
7, pin 8, or pin 9.
Is there 48 volts present at both P1 and P2?
Yes No
031
Is 48 volts missing from both P1 and P2?
Yes No
032
– Go to Step 037 on page 1-134.
033
Voltage is not present at both P1 and P2.
– Go to “MAP 0480: Open in 48 V dc Distribution” on page 1-283.
034
(Step 034 continues)
Chapter 1. Maintenance Analysis Procedures (MAPs)
1-133