Question about Sharp R-820B Convection/Microwave Oven
If it blew as soon as you hit Start or another pad which would make it start, then I would suspect you have a shorted high voltage capacitor.
In some cases a loose fuse holder will cause the fuse to melt open after so long.
With the microwave unplugged, if you can easily turn the fuse with your thumb & forefinger while it's in the holder, it has overheated and fatigued and the holder should be replaced.
Simply squeezing the holder's terminals together with pliers is not really a good or long-term solution. Metal fatigue is fatal.
When a connection is loose, heat results, which eventually melts the fuse internally.
This is usually evidenced by a very tiny ball of solder at the point where the end cap meets the body of the fuse.
You can use a generic holder - it's a lot cheaper than ordering one. The connectors should be 1/4" tabs and it should be rated at 20 amps or better.
You should be able to get one from a home center or local appliance parts store.
Assuming you have a model R-820B, We have the service / repair manual for this model and have uploaded it to our site here to help you.
It will give you safety info, step by step help in disassembly, troubleshooting tips, and part numbers.
Most computers will open this document automatically, but you may need the free Adobe Reader.
You can order parts from Encompass here or you can call them toll-free at 866-779-5835.
Bulbs and 20A ceramic fuses can be had locally in most grocery stores, hardware stores, home improvement centers, and big box or department stores.
Reply back if you have a different model number or need more help.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
Posted on Jun 30, 2009
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Posted on Jan 02, 2017
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