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Microwave Ovens Master
Re: panasonic microwave model NN740BAW F
You probably have a shorted door switch or a shorted relay on the control circuit board.
you or someone you know decide to look into it, we have critical safety
information, info on door switch diagnosis and replacement, and
disassembly information at our site, and our link is at our listing here on FixYa.
If you think the problem is on the control panel, we repair these nationwide by mail for $39.95 postpaid in most cases.
Feel free to contact me directly (and include your model number) for more information & help.
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You didn't say what model microwave you have, but most that I have seen have two separate circuits inside. One operates the magnetron (which makes the microwaves) and the other operates the other things like the turntable or the inside light etc.. It is quite possible that you have a problem in that second circuit. This allows the heating without the turning. To fix this type of problem, if indeed that is the case, requires some skillful trouble shooting inside the microwave which I don't recommend your try unless you are a skilled technician, because of dangerous voltages. Go ahead and post the brand and model number and I can be more specific as to what action to take.
If the microwave comes with a roller ring to rotate the glass turntable then I would recommend that it needs to be used when the microwave is operating, as the turntable rotates the food so it can be heated evenly.
I would recommend checking with your local Panasonic repairer he may have access to a new roller or even a second hand one to tide you over.