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S9303 temperature mistake report lead to fan was disable for speed-regulation

Publication Date:  2012-10-16 Views:  46 Downloads:  0
Issue Description
S9303 (version V100R001C02B118) fan run by 100% speed, it reported alarm lead failure when manual speed-regulating. Wiew system alarm information, find the temperature alarm on main control board.
Alarm Information
[S9303]set fan-speed slot 6 percent 30                                         
ERROR: Can not Set Fan Speed Because of Alarm, error code: 0x70d9!
[S9303-hidecmd]dis alarm all                                                   
----------------------------------------------------------------------------   
Level          Date        Time                Info                            
Warning      2009-04-10  14:04:31    PWR board[7] is absent.
Warning      2009-04-10  14:04:14    The "2.5V" voltage sensor of MCU  board[5](entity) exceed lower minor limit.
Warning      2009-04-10  14:04:14    The "1.8V" voltage sensor of MCU board[5](entity) exceed lower minor limit. 
Warning      2009-04-10  14:04:14    The "1.25V_A" voltage sensor of MCU board[5](entity) exceed upper minor limit.
Warning      2009-04-10  14:04:14    The "1.2V" voltage sensor of MCU board[5](entity) exceed upper minor limit.       
Warning      2009-04-10  14:04:14    The "3.3V" voltage sensor of MCU board[5 ](entity) exceed upper minor limit. 
Warning      2009-04-10  14:04:14    The "CLK_DET_125M" sensor12 of MCU board5] detect clock signal fault.            
----------------------------------------------------------------------------

Handling Process

1. Board type BoardExtType was 3 by disp cdev slot 5 command in hide view, this command is for viewing right board type.
2. BoardExtType was 7 by dis dsms variable slot 5 in hide view, which needed to modify.
3. Modify main control board type, set boardid <slot-id> <type-id>
[S9303-hidecmd]set boardid 5 3
Reset CBUS on board, CBUS reset cbus slot <slot-id> cold
[S9303-hidecmd]reset cbus slot  5 cold
After main control board reset complete, view the alarm, if it disappeared, come to step 5, if the alarm remain, come to step 4.
4. Update CBUS software and SDR files by command line.
<S9303>upgrade slavempu jtag startup canbus_app
<S9303>upgrade slavempu jtag startup canbus_sdr
5. Alrm disappear at the moment, fan can regulate speed automatically, speed auto regulated to 27%.
Root Cause

1. Backup main control board (slot 5) type configuration failure, which lead CBUS configuration files failure, it appeared temperature alarm.
2. Because the temperature alarm, the fan would run by full speed. And it cannot regulate manually.
3. Modify right board type, reset CBUS, it can clear up the temperature alarm, make the fan for auto speed-regulation.
Suggestions
The fan will run by full speed when device had temperature alarm, when the alarm is caused by other reasons, it must be handled, clear up the abnormal alarm, make the fan speed to normal.

END