Mainboard Low voltage of RTC battery on the mainboard.

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Mainboard        Low voltage of RTC battery on the mainboard.

官网的解决办法：
Procedure

• Power off the server, and remove the power cables from the server.
• Check whether the RTC battery has been installed on the mainboard.
  
  • If yes, go to Step 4.
  • If no, go to Step 3.
    
  
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• Install an RTC battery on the mainboard. Then check whether the alarm is cleared.
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  • If yes, no further action is required.
  • If no, go to Step 4.
    
  
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• Replace the RTC battery, connect the power cables, and power on the server. Then check whether the alarm is cleared.
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  For details about how to replace an RTC battery, see the KunLun 90xx V100R001 User Guide.
  • If yes, no further action is required.
  • If no, go to Step 5.
    
  
  
• Contact Huawei technical support.
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