Question about Sharp Microwave Ovens

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Sharp model R-4A54

Purchased 06/20/04. While operating there was a loud snap and then the unit went totally dead. No clock, no light inside, nothing. Outlet power OK.

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Chances are your high voltage diode blew or the high voltage capacitor shorted, and your fuse is out too.

If you or someone you know 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.

You can probably find exploded views and order parts by entering your model number here at the Sears parts site. The best place to order Sharp parts is Tritronics.

Here are some links you or someone you know can use for test help, but read their safety warnings first:

http://www.gallawa.com/microtech/cap_test.html
http://www.gallawa.com/microtech/diode.html

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

Posted on Jul 28, 2008

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oh,, by the way,,,
your very lucky to still be alive right now!!!
tinkering inside of a microwave could kill you,,,
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The lights went out for my clock, how do I fix


You have a two part board. The control and the display. They're hooked together with a 12 wire connector soldered at each end. You might be able to find a weak solder joint. Check for one that is a little off-color, or you might see a crack if you use a magnifier. If so reheat with a gun. Otherwise forget it, the board, if available, would cost more than a new unit.
TWO ANDS. And know what you're getting into before you take the top off. See how to discharge a capacitor on many tech sites. Capacitors have killed people!!! The second AND, is be sure you stay by your MW while cooking. If you mistakenly enter the wrong cook time, well, fire and like that.

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My sharp microwave made a loud humming sound for a few seconds and quit working. The clock and light are also not working.Sharp model R-1461-A, serial 121279, May 1997


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 (or GFI) 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 someone you know 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.

Here are some links you or someone you know can use (in order given) for test help, but read the safety warnings first:
http://www.gallawa.com/microtech/cap_test.html
http://www.gallawa.com/microtech/diode.html (if it is NOT shorted, it's probably fine)
http://www.gallawa.com/microtech/xformer.html

You can usually find exploded views Sears parts site.

BUT Once you have the part numbers, the best place to order Sharp parts is Tritronics.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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Most of these have internal line fuses inside of the casing. Once you remove the housing that covers the top and sides, follow the wires from the cord and they should lead you to the fuse. They are usually on the front rh side looking at it from the front. Be careful, even though unplugged, this unit still stores alot of electriacal energy in the capacitor.

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1 Answer

Nothing happens..


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.

I would suspect it needs a new high-voltage capacitor and a fuse.

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

Actually, we also have the full service manual for this model on our site, linked above.

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

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No Power at all after loud short buzzing sound


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