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Old 07-28-2012, 08:07 PM   #3
Join Date: Jul 2006
City & State: southern california
Posts: 28
Default Re: Need tips in fixing APC 1500VA UPS having buzzing noise

Originally Posted by budm View Post
Is this UPS a true sine wave inverter or step sine wave type? Do you have full model number?
UPS is a true sine wave inverter; model number being SUA1000VA. I never use step sine wave types :-)

The noise seems to be from the EPCOS cap, but also could be from the chicklet brown cap to its left:
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