Question about APC Back-UPS 400EI (BK400EI) UPS System

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Inverter 12V to 230v not working

Hello,
I have an APC ups 400 EI and I've found the 5A link blown on the battery negative and the all four mosfet transistors with a nearly zero resistance between drain and source - I 've done the measurements with the transformer disconnected from the PCB.
I can't get a schematic to fix this Ups.
Could you please help me.
Thanks,
Adrian.

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  • 169 Answers

Could be the devices, the inverter, the up converter,or the micro.

Throw it away and buy a new one, as this will be cheaper and easier.

UPS devices are very complicated with lots of related circuits logic etc.

These units are not made to last, recover the batteries or recyle the whole thing.

Posted on Sep 21, 2009

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Posted on Jan 02, 2017

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