Question about Sharp R-820bk 900-watt 0.9 Cubic Foot Convection Microwave, Black
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Posted on Jan 02, 2017
There are a couple of safety thermostats in the oven to shut down power if something overheats. One is on the magnetron tube (the microwave source), the other is on the cooking cavity. These sometimes go bad. There's also a power line fuse that may have failed, or become loose in its mounting clips. These can be tested with an ohmmeter; they should all measure very close to zero ohms if they're good.
Another possibility is that the control circuit board in the oven may have failed. I have worked on several Sharp ovens where the power transformer for the board has gone bad for no good reason. If the board goes bad the oven may appear to be dead as well.
Microwave servicing is best left to professionals. If you're thinking of keeping this one, take it to a service shop (or call for home service) and get an estimate. Then decide whether to repair or replace.
Hope this has helped a little. Thanks for using Fixya!
Posted on Feb 02, 2010
Testimonial: "Thank you. I will check it out and then decide whether to repair or replace."
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.
Posted on Sep 16, 2008
My sharp microwave convection oven (R-1870) runs for 59 seconds and stops. If I push start it runs for another 59 seconds and stops. How can this be fixedd?
Posted on Oct 22, 2009
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