IBM RS/6000 SP, Maintenance Information

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MAP 0540: Switch Function
085 (continued)
– Reset the clock setting to that recorded in Step 079 on page 1-346.
– Run advanced diagnostics on “css0” on the “test” processor node. Do not perform cable wrap test. Ref-
erence "Running Diagnostics in a Processor Node" in IBM RS/6000 SP: Maintenance Information,
Volume 3, Locations and Service Procedures, as required.
– Look for an SRN indicating a clock problem, for example “External clock” is one of the failing compo-
nents.
Do the “css0” diagnostics fail with indication of a clock problem?
Yes No
086
Problem is not in this switch assembly.
– If this is an HiPS 3.0 or SPS switch assembly, skip to Step 088.
– If this is an HiPS 2.0 switch assembly, swap the corresponding data connections at S00-BH-J3,
J5, J7, or J9.
– Run advanced diagnostics on “css0” on the “test” processor node. Do not perform cable wrap
test. Reference "Running Diagnostics in a Processor Node" in IBM RS/6000 SP: Maintenance
Information, Volume 3, Locations and Service Procedures, as required.
– Look for an SRN indicating a clock problem, for example “External clock” is one of the failing
components.
Do the “css0” diagnostics fail with indication of a clock problem?
Yes No
087
– Return all cables and interposers to original positions.
– Replace the data cable interposer corresponding to the selected clock.
– Go to Step 090.
088
– Return all cables and interposers to original positions.
– Go to Step 077 on page 1-346.
089
Problem is the clock selection in this switch assembly.
– Go to Step 074 on page 1-345.
090
– Run advanced diagnostics on “css0” on the “test” processor node. Do not perform cable wrap test. Ref-
erence "Running Diagnostics in a Processor Node" in IBM RS/6000 SP: Maintenance Information,
Volume 3, Locations and Service Procedures, as required.
– Look for an SRN indicating a clock problem, for example “External clock” is one of the failing compo-
nents.
Do the “css0” diagnostics fail with indication of a clock problem?
Yes No
091
Interframe clock problem resolved.
– Go to Step 101 on page 1-350 to verify fix.
1-348
RS/6000 SP MAPs