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Step 0620-033
All ground straps connecting the frames make adequate contact at both ends.
1. Disconnect clock source data cable at S00-BH-J3, J5, J7, or J9, then reconnect to SP Switch. (This is
done to eliminate clocking noise from cable.)
2. Find a processor node in the “problem” frame which is usable for service. This will be used as the
“test” processor node.
3. Run advanced diagnostics on “css0” on the “test” processor node and its associated switch port.
v Do not perform cable wrap test.
v Refer to ″Running diagnostics in a processor node″ in
RS/6000 SP: System Service Guide
.
4. Look for an SRN indicating a clock problem, such as “External clock” being listed as one of the failing
components.
Note: Do not exit from diagnostics at this time, as it may be used in the following steps.
5. Do the “css0” diagnostics fail with an indication of a clock problem?
v If yes, go to “Step 0620-036” on page 1-34.
v If the diagnostics did not fail with an indication of a clock problem:
a. If this the first time at this step, go to “Step 0620-034”.
b. If this the second time through this step, go to “Step 0620-043” on page 1-36 to verify fix.
Step 0620-034
The first time you went through “Step 0620-033”, the diagnostics did not fail with an indication of a clock
problem.
1. Disconnect the switch data cable corresponding to the selected clock at the SP Switch.
2. Run advanced diagnostics on “css0” on the “test” processor node and its associated switch port.
v Do not perform cable wrap test.
v Refer to ″Running diagnostics in a processor node″ in
RS/6000 SP: System Service Guide
.
3. Look for an SRN indicating a clock problem, such as “External clock” being listed as one of the failing
components.
Note: Do not exit from diagnostics at this time, as it may be used in the following steps.
4. Do the “css0” diagnostics fail with an indication of a clock problem?
v If yes:
a. Problem is not in the SP Switch.
b. Replace the switch data cable corresponding to the selected clock, reconnecting it at both SP
Switches.
c. Go to “Step 0620-040” on page 1-35.
v If no, go to “Step 0620-035”.
Step 0620-035
The “css0” diagnostics did not fail with an indication of a clock problem. This indicates that the problem is
related to the clock selection in this SP Switch.
1. Replace the clock card in this SP Switch.
v Make sure to connect all cables connected to the clock card.
2. Reinstall only the two switch data cables which are not selected and the switch data cable to the “test”
processor node.
v Do not connect the remaining switch data cables at this time.
3. Reconnect cables S00-BH-P1 and S00-BH-P2 at the rear of the SP Switch.
4. Put the SP Switch’s circuit breaker into the On (‘1’) position.
SP Switch function (MAP 0620)
Chapter 1. Maintenance Analysis Procedures (MAPs) 1-33