IBM RS/6000 SP manual Step, SP Switch function MAP

SP Switch function (MAP 0620)

5.Look for an SRN indicating a clock problem, such as ªExternal clockº being listed as one of the failing components.

6.Do the ªcss0º diagnostics fail with indication of a clock problem? v If yes:

a.Problem is the clock selection in this SP Switch.

b.Return to ªStep 0620-035º on page 1-33.

vIf no, go to ªStep 0620-039º.

Step 0620-039

The ªcss0º diagnosticsdid not fail. This indicates that the problem is not in this SP Switch.

1.Return all cables to their original positions.

2.Return to ªStep 0620-034º on page 1-33.

Step 0620-040

The clock settings on the problem switch appear to be okay and the problem switch is mounted in a frame that also contains processor nodes. The ground straps appeared to be okay so you set up a test processor node and went through the ªcss0º advanced diagnostics. The diagnostics passed on the first run through so you disconnected the switch data cable and ran the diagnostics a second time. On the second run, the diagnostics failed. This indicated that the problem was not in the SP Switch.

1.Make certain that you replaced the switch data cable corresponding to the selected clock at both SP Switches.

2.Run advanced diagnostics on ªcss0º on the ªtestº processor node and its associated switch port. v Do not perform cable wrap test.

vRefer 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 ªExternal clockº being listed as one of the failing components.

4.Do the ªcss0º diagnostics fail with indication of a clock problem?

vIf yes, go to ªStep 0620-041º.

± Replace the ªmaster-clockº SP Switch.

vIf no:

a.Interframe clock problem resolved.

b.Go to ªStep 0620-043º on page 1-36 to verify fix.

Step 0620-041

You have determined that there is a problem in the SP Switch and that you need to replace the switch assembly.

1.Put the SP Switch's circuit breaker into the Off (`0') position.

2.Disconnect all switch data cables (also clock cables and data cable interposers, if present) from the bulkhead of the switch assembly.

3.Replace the switch inner chassis.

4.Replace the switch planar.

5.Reinstall all cables inside the switch assembly.

6.Reinstall the top cover.

7.Reinstall the switch assembly.

8.Go to ªStep 0620-042º.

Step 0620-042

You have replaced switch components and need to complete a final check before verifying the fix.

1.Be careful to reconnect all cables according to the appropriate wiring chart or labels, and put wrap plugs on any unused data ports (S00-BH-J3 through S00-BH-J34).

Chapter 1. Maintenance Analysis Procedures (MAPs) 1-35