MSAN UA5000 Cases Chapter 1 MA5600 Cases
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1
Chapter 1 MA5600 Cases
1.1 Fan Block Alarm Is Generated Because of the Fan Fault
Title:
Fan Block Alarm Is Generated Because of the Fan Fault
ID: SE0000352549
Information
Type :
Troubleshooting Cases Quality Level:
C
Product Family: Broadband Access Product: SmartAX MA5600
Fault Type: Backplane/Board Hardware
Keywords: Fan, block alarm, high temperature
Permission Level: Warranty Users Permission
Phenomenon Descr
iption:
1. The ADSL service boards in slots 13 and 14 of an MA5600 often restart automatically or the
ports of the service boards are dead locked.
2. Query the temperature inside the MA5600. It is found that the temperature even reaches 48°C,
and the fan block alarm is generated.
3. Pull out the fan tray. It is found that the fan responsible for slots 13 and 14 has stopped
working. When the device is powered, the fan does not work either. The fan type is: fan box｜
PDU, MA5300, H53E1FCBA, 6-fan 1U fan box.
Alarm Informatio
n:
ALARM 764355 fault alarm important 0x15411024 environment 2008-07-14 09:15:40
Alarm name: fan block alarm
Parameters:
Alarm description: fan block alarm
Alarm cause: Some subjects block the fan.
Troubleshooting suggestion: Check the fan.
Cause Analysis:
The temperature inside the device is too high, the fan block alarm is generated, and the ADSL
service boards in slots 13 and 14 cannot provide the internet service. After the analysis, it is
estimated that one of the six fans in the fan box of the MA5600 fails, and this faulty fan is
responsible for the heat dissipation of the ADSL boards in slots 13 and 14.
The prerequisite for generating the fan block alarm is the hardware failure of the fan.
Handling Proces
s:
According to the fault analysis, it is determined that the fan fails. After the fan is removed and
checked, we confirm that the hardware fault of the fan exists. That is, the fan responsible for the
heat dissipation of the slots 13 and 14 fails.
After a new fan is installed, in half an hour, query the temperature of the device. It is found that
the temperature falls, and thus the ADSL service boards in slots 13 and 14 no longer
automatically restart and the service ports are not dead locked.
Suggestions and
Summary:
The high temperature of the device usually results from the failure of the fan in the device. When
the fan fails, query the alarm and replace the fan in time to avoid burning the service board or the
backplane.
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