Question about Tripp Lite Internet 750U (internet750u) UPS System

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UPS burned 4 internal components while idling

While it was idling during my vacation the UPS had a burnout: a pair of 1N5404 power diodes (they split open and scorched the board), an IRFZ44V power MOSFET (shorted gate to drain), and a circuit trace (melted through). The transformer appears perfect, and the battery remains good.

I replaced components and fixed those faults; the unit turns on and the buzzer sounds momentarily like normal but there's no voltage on the regulated outlets.

If I had a circuit diagram (with voltages marked) I might be able to fix it. Are they available?

Or is there somewhere to send the circuit board for refurb?

Thanks,
Kurt

Posted by on

  • kurtking May 09, 2009

    palaboy, that would have been the second test had it worked plugged in. Right now it's apart. FWIW, before plugging it in, when I connected the battery, there was no spark.

    P.S. Sorry about the double posting - didn't get a completion until the second.


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