Question about Microwave Ovens
It may be a thermal fuse. There is a thermal fuse in most modern microwaves that will kill the unit if something gets too hot in the cavity. Sometimes the magnetron thermal protector can shut down the unit. check them both for continuity.
Posted on Nov 22, 2014
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Posted on Jan 02, 2017
SOURCE: My Sharp over the range
Itmay be the fuse, which is usually located behind the grille or on thefloor of the oven behind the control panel or between the door switches.
Ifthe fuse is good, it may be an open thermostat or thermal cutout (TCO)/ thermal fuse on or near the magnetron or on top of the cavity / bodyof the oven.
If it goes dead for a while during or after cookingthen comes back on, the magnetron is probably overheating and causingthe magnetron thermostat to open.
Then when it cools, it closes the circuit and allows power through again.
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.
Ifit goes dead or blows the breaker (or GFI) when you plug it in or open or closethe door, then there's a problem with a door switch or door switchmount.
If it's intermittent or random, it may be a badconnection, usually on the control board or a loose fuse holder, oreven an intermittent fuse.
While we don't have that exact manual, we do have a similar service manual here which should be close enough to help you or someone you know troubleshoot these basics.
Once you know what's wrong, 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.
Posted on Oct 20, 2008
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Dead appliance, power on wall outlet.
SAFETY IS PARAMOUNT!
this only if you are competent.
your appliance has absolutely no functions at all, remove it from the
mains supply, remove the case and see where the mains lead goes in to
the appliance and follow the cable until you find the main fuse.
ONLY USE THE SAME TYPE AND RATING OF FUSE TO REPLACE IT.
The usual cause of this fuse failure is the door switches are contaminated or sticking. Check the door switches before putting power back on to the appliance.
Hope this helps.
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