Sharp Convectional microwave oven model R990K (R980J) working but convection not working only getting to 70 degrees what are the common problems causing this?
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definately dont use the standard glass plate for convectional 'oven' cooking, as it will shatter. i have had TWO plates shatter so far before realising they should only be used for microwave cooking.
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The manuals have a safety info, disassembly info, troubleshooting chart, test procedures, part numbers, etc.
I would first suspect a bad thermistor, but it should be checked, as well as the line voltage at the outlet, etc.
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it could be the magnatron or the high voltage fuse, they are the common problems of a microwave not heating. ALWAYS GET A QUALIFIED TECHNICIAN OR SOMEONE WHO KNOWS HOW TO DISCHARGE A HIGHVOLTAGE CAPACITOR BEFORE ANYTHING INSIDE A MICROWAVE IS TOUCHED, ALWAYS UNPLUG FROM WALL ALSO!!!!
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