Question about Microwave Ovens
Most likely the cavity temp fuse is open. Sharp mounts theirs typically near the back of the unit, on the top center.
Posted on Oct 28, 2013
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Posted on Jan 02, 2017
at highvoltage section wiring may bae problem, check wiring and connectrors of magnetron and capacitor and transformer.
Posted on Dec 12, 2007
A microwave can be dead for many reasons.
The fuse is normally located on the floor of the chassis behind the control panel or between the door switches.
If the 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 / body of the oven.
If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open.
Then when it cools, it closes the circuit and allows power through again.
When checking thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.
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 it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.
You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.
If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.
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: http://tinyurl.com/yzjozk
We're happy to help and we appreciate your thoughtful rating of our answer.
Posted on Jun 23, 2008
GE JES 1358 WK 01 microwave:
I recently had the same problem with a "flame sensor, " aka "thermal switch." My microwave is a "throwaway" model, very few repair parts available. I didn't want to replace it, so I did a little bit of research into thermal switches. I actually found one that would replace it for about $5 (plus $5 shipping).
Mine uses a "bimetal" thermal switch. There are three kinds of bimetal thermal switches: automatic reset, manual reset, and "one time use." The really interesting thing is this: the "one time use" resets (!!!) if the ambient temperature is below 0 degrees C, or 32 F (freezing); or, in some cases, -31 C, or about -22 F.
I put my "dead" flame sensor in the -10 F part of the freezer for about 20 minutes...
Checked it with my multimeter, and the once-dead sensor now read continuity (zero ohms)!!!
Reinstalled it in the microwave, and now it works fine.
So if you have a dead sensor- try freezing it...
Posted on Jan 23, 2009
Is it dead, meaning no
display, no light when you open the door and no beeps when you press a
pad on the keypad?
We have the relevant service / repair manuals for this model and have uploaded it to our site here and here to help you.
They will give you safety info, step by step help in disassembly, troubleshooting tips, and part numbers.
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I would suspect the 20A ceramic line fuse or the magnetron temperature fuse.
You can order parts from Encompass here or you can call them toll-free at 866-779-5835.
20A ceramic fuses are available at local appliance part stores or places like Wal-Mart and Lowe's.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
Posted on Jun 04, 2009
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