work report

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Mar 28, 2011 10:26
Customer reported problem summary: single parity error occurred suddenly

Inspection & review results: (0) Defects detected: no scratch, broken issues

Fault duplication results: switch can’t boot up normally, it can’t run diagnose test.Same error messages were displayed after power on the switch

Fault isolation results:
1.We check the power and clock, all the power and clock were normal
2. The CPU (U20- MPC8548P) input signal was normal, but there was no output signal.
3. Replace the CPU, power on the switch, the system boot to IOS.
4. There is console output from the supervisor with no error messages.
5. External diags test pass the items
6. Leave system run for more than 50 hours, it works normally
7. Due to the CPU was fail, so the switch can’t boot up normally

Failure Analysis Conclusion: Due to the CPU was fail, so the switch can’t boot up normally


There is my work report,please help me to check
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