IBM RS/6000 SP, Maintenance Information

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MAP 0530: Switch Assembly Power
007 (continued)
Does the circuit breaker go (trip) to the Off (‘0’) position?
Yes No
008
– Go to Step 012 on page 1-315.
009
– Have the customer remove the switch assembly from the active configuration and power off the switch
assembly.
– Put the switch into service position. Refer to "Service Position Procedures" in IBM RS/6000 SP: Mainte-
nance Information, Volume 3, Locations and Service Procedures.
– If this is an SPS or SPS-8, go to Step 036 on page 1-318
– If this is an HiPS or HiPS-LC8, check switch power harness (at power card P901 and circuit breaker)
inside switch assembly for any obvious problems which might cause a short.
Does switch power harness appear okay?
Yes No
010
– If this is an HiPS 2.0, replace the switch assembly.
– If this is an HiPS 3.0 or HiPS-LC8, fix obvious problems; if necessary, replace the switch power
harness.
– Replace the switch from service position. Refer to "Service Position Procedures" in
IBM RS/6000
SP: Maintenance Information, Volume 3, Locations and Service Procedures.
– Reconnect switch assembly cables.
– Go to Step 007 on page 1-313.
011
– Replace the switch from service position. Refer to "Service Position Procedures" in IBM RS/6000 SP:
Maintenance Information, Volume 3, Locations and Service Procedures.
– Using multimeter, check continuity between either tab of circuit breaker and a ground busbar (black wire
attached) on the switch planar.
– Perform ‘Actions’ from table one-at-a-time until short disappears:
Order Action Replace
1 Unplug P102 from switch super-
visor. If this is an HiPS 2.0, replace switch assembly. If this is an
HiPS 3.0 or HiPS-LC8, replace switch supervisor card. Refer
to "Removing the Switch Supervisor Card (HiPS 3.0,
HiPS-LC8, SPS, SPS-8)" in
IBM RS/6000 SP: Maintenance
Information, Volume 3, Locations and Service Procedures.
2 Unplug P901 from power card. S00-PC-P901 cable.
3 All unplugged. If this is an HiPS 2.0, replace switch assembly. If this is an
HiPS 3.0 or HiPS-LC8, replace switch power card.
– If “Action” removes short condition, replace the corresponding part in the “Replace” column.
– Reconnect switch assembly cables.
– Go to Step 007 on page 1-313.
012
(Step 012 continues)
1-314
RS/6000 SP MAPs