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how can i fix noise on my microwave ?

I have a Hitachi MCB30 that has developed a continuous loud humming whilst switched on. Every thing appears to be working but the humming only stops when the door is opened or the power turned off. It sounds like a motor trying to drive something that is stuck although when using the microwave facility the table turns ok and the humming can still be heard above the sound of the microwaving.
Les, February 2011
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