UPS making distracting humming noise

donjasjit

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Jun 29, 2012
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Hi friends, just a query. I have been using the Optoma 141 projector for the past year without problems.

I have a issue however, my UPS APC BR1100CI Projector makes constant hum. It is distracting .Any suggestions.
 
Hi

Check the electric point and try plugging in another socket...if same issue, check if the cables connected to it are in proper order....humming indicates a grounding issue..
 
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