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I too have Sharp microwave that constantly beeps at approximately one minute intervals if the food you have been heating isn't removed. It is loud, persistent and extremely annoying. I've opened the machine to try and find the loud speaker but cannot find it (it could be built in to the circuitry?). Any help on this would be appreciated. It's a very unfortunate design flaw on what is otherwise a very good and easy to use microwave.
Something has failed in the high voltage supply to the magnetron. There are no user serviceable parts inside, but there are INSTANTLY LETHAL voltages present. Scrap the oven & get a new one, they are generally not worth reparing.