SOURCE: R-4H84 Sharp Carousel II microwave oven stoped working
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
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SOURCE: Sharp Carousel Model R9H84B
I've attached the portion of the manual which shows how to lock & unlock this model.
If that doesn't work, unplug the oven for one minute, plug it back in aga9in, then try again.
If it still doesn;t work, then your keypad has failed, and they are no longer available for these model, so the oven would have to be retired.
Good luck.
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SOURCE: Sharp Carousel Microwave Convection Oven
The
first thing I would suggest is a hard reset. Unplug the unit for a
minute or so. Then plug it back in, set the clock and try again.
If that doesn't work, leave it unplugged for maybe an hour.
Then let us know if the hard reset does not fix it.
You may have a bad keypad.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
SOURCE: my Sharp carousel model R-306LW
We have the service manual for this model and have uploaded it to our site here to help you.
You will need the free Acrobat Reader to view or print it in case you don't have it already.
I would bet that the high voltage capacitor shorted and took out the fuse. It may possibly be the high voltage rectifier diode, but I bet it's not.
Here are some additional 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)
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.
SOURCE: How do I uninstall an
Try removing the filters beneath the microwave. Youll find a large screw at roughly a 45 degree angle on each side. These screws bolt the microwave to the mounting panel in the rear.
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