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My microwave is making a grinding sound, and I’ve replaced the turntable motor, but the noise has not gone away.

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Deann
You could have a magnatron or transformer going bad.

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IF GRINDING NOISE IS CONSTANT YOU MAY HAVE A SEPERATE STIRROR MOTOR IN UNIT LOCATED IN THE TOP OF THE CAVITY OR YOUR COOLING FAN MOTOR BEARING MAY BE BAD IF THE NOISE IS INTERMITTANT THEN YOU MAY HAVE MAGNETRON OR HIGH VOLTAGE SUPPLY ISSUE

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