Re: APC Back-UPS RS 800 VA (BR800I) overload LED

By the way, I was thinking ESD, not ESR. At the frequencies in play in the UPS, I don't think really low ESR is necessary.

Re: APC Back-UPS RS 800 VA (BR800I) overload LED

Thanks for your reply Behemot! While I certainly agree with your rationale of simply replacing all the SMD caps, I do not have an inventory of components with which to make such a change. I must admit to having a bias for repair over replacement in general, even though it may not be economically sound -- I intensely disliked the notion of sending my UPS to a garbage dump. Considering only the replacement cost of batteries, after two replacement cycles, it is probably more cost effective to buy a new UPS than a third set -- nevertheless...

Re: APC Back-UPS RS 800 VA (BR800I) overload LED

I recently repaired my RS 800 which showed a variety of fault symptoms including overload until I finally was able to have it help me track down the fault (C60 in the -8V charge pump). Yup, a bad cap. I'll get to the details shortly.

The first APC overload issues I had were with XS 1500 and XS 1000 models. In both cases, it was the FET 'modified' sine wave switchers (34N20 or similar 20NQ20). I wrote an amazon.com review of these units years ago, link here: [url]https://www.amazon.com/review/R26OF4E1QBAOUF[/url]
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