I have APC 900 UPS for about 4 to 6 years now and works very good except the cooling fan goes into high speed for no real good reason and sometimes does this for hours
Anyone have any idea what could be be the problem with it and what it will take to fix it
I have noticed is that it has two temperature sensors one on the two LM317 heat sinks and one in the battery compartment but I have not figured out how the fan is controlled ( yet )
I am going to recap this board before I put it back in service
Anyone have any idea what could be be the problem with it and what it will take to fix it
I have noticed is that it has two temperature sensors one on the two LM317 heat sinks and one in the battery compartment but I have not figured out how the fan is controlled ( yet )
I am going to recap this board before I put it back in service
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