ALM-9734 Temperature Sensor Fault

Description

This alarm is reported when communication between the NFCB and the temperature sensors on the NFCB and air intake vent is interrupted.

Attribute

Alarm ID	Alarm Severity	Alarm Type
9734	Major	Fault

Parameters

ID	Name	Meaning
1	Site No.	Number of the site where the faulty board or module is located Value range: 0-2047
2	Board Type	Number of the type which the faulty board belongs to. 69:NFCB 93:FMU 94:FMUA
3	Board No.	Number of the fault board 0-5:NFCB/FMU/FMUA
4	PassNo	Number of the passage where the faulty board is located.
5	SubLink No.	Alarm sub-category number 0:The temperature sensor in the air inlet is faulty. 1:The temperature sensor in the fan box is faulty.
6	Cell Index	Index of the cell where the board or module is located 0-2047: Cell index of the faulty cell in the data configuration 65535: None
7	Site Type	Type of the site where the faulty board is located. 12:BTS3012; 13:BTS3006C; 14:BTS3002E; 15:BTS3012AE; 16:BTS3012 II; 18:BTS3900 GSM; 19:BTS3900A GSM;
8	RackNo	Number of the rack where the faulty board is located.
9	BoxNo	Number of the subrack where the faulty board is located.
10	SlotNo	Number of the slot where the faulty board is located.
11	Site Name	Site Name
12	Alarm Attribute	Alarm Character 0:Normal 1:Transient Count

Impact on the System

The fan box cannot communicate with the DTMU, report the alarm or adjust the speed through the main control unit. The fan is automatically set to full speed after the alarm.

System Actions

None.

Possible Causes

The temperature sensor in the air inlet is faulty.
The cables of the temperature sensor in the air inlet are faulty.
The fan box is faulty.

Procedure

Check the temperature sensor cable.
1. Disconnect the power cable and the serial cable of the fan. Remove the fan, and then reconnect the cable of the temperature sensor where the alarm is generated. Reinstall the fan, and reconnect the power cable and the serial cable of the fan.
2. Check whether the alarm is cleared:
  Y => The alarm is cleared. The alarm handling ends.
  
  N => The alarm is not cleared. Go to procedure 2.
Replace the temperature sensor.
1. Disconnect the power cable and the serial cable of the fan. Remove the fan, and then replace the temperature sensor where the alarm is generated. Reinstall the fan, and then reconnect the power cable and the serial cable of the fan.
2. Check whether the alarm is cleared:
  Y => The alarm is cleared. The alarm handling ends.
  
  N => The alarm is not cleared. Go to procedure 3.
Replace the fan.
1. Replace the fan.
2. Check whether the alarm is cleared:
  Y => The alarm is cleared. The alarm handling ends.
  
  N => The alarm is not cleared. Contact Huawei Customer Service Center.