Question about Sharp R-1490 Microwave Oven

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Powerless microwave My microwave quit working. I changed the power fuse, which brought power back to the unit, but as soon as I turn it on, it blows again. Any suggestions as to what is blowing the fuse

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  • Anonymous Jun 29, 2008

    I have exactly the same problem. replaced the fuse behind the control panel, plugged it in to power, saw the panel light up (i.e. the clock was blinking as when the power goes out), pressed the start button and it blew the fuse again.
    the model is R-4H84.


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A microwave can be dead for many reasons.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder.

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

If you or a friend decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

We're happy to help and we appreciate your thoughtful rating of our answer.

Posted on Feb 27, 2008

The HV capacitor or the HV diode may be in short, check these parts, discharge the capacitor before touching anything.
Maybe something is shorted to ground.

Posted on Feb 17, 2008

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