Certain boards report the TF alarm transiently because the FAN speed is low and the board temperature reaches 60°C centigrade.
Symptom
The LWF board in the BWS 1600G reports the TF alarm transiently. Reseat the board and the alarm is cleared. The alarm, however, is generated again several days later. Query the board performance by using the T2000. It is found that the temperature of slots 1, 2, 11, and 12 is extremely high and reaches 60°C centigrade. Then, check the fan status. The fan is working normally. Check the PMU performance. The ambient temperature is 35°C centigrade.
Cause Analysis
- The NE temperature is very high because the ambient temperature is extremely high.
- The laser of the board is aged.
- The fan speed is very low and thus the temperature in certain areas in the NE is very high.
Procedure
- Measure the ambient temperature. The ambient temperature is 25°C centigrade, which is normal.
- Measure the NE temperature. The temperature in the two sides of the NE is very high and the temperature in the middle area is normal.
- Check the fan speed. It is found that the air distribution on the right and left sides is inadequate.
- Replace the fan board. The board temperature becomes normal and the TF alarm is cleared.
Reference Information
None.
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