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An uninterruptible power supply, also uninterruptible power source, UPS or battery/flywheel backup, is an electrical apparatus that provides emergency power to a load when the input power source, typically mains power, fails.

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APC Back-UPS CS 500 does not power up?

Hi All,

The above device wasn't holding a charge, so I swapped out the battery, and it appeared to be fine for about a week.

Next thing I know, the "power" and "battery" lights were both on, but VERY dim indeed.

The device has now totally gone off and is unresponsive. I verified that the replacement battery isn't faulty as well.

Can anyone offer any assistance with this please? Thanks!

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push the circuit breaker, check the power switch and on board fuses. if all else remain ok then power mosfet maybe busted!


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try to push the circuit breaker, verify the condition of the power switch, check the fuses on-board

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Ajoy Chundee será eternamente grato(a).
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