Question about Tappan Microwave Ovens

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I have a Tappan Model # 56-5472-10/91. I started the microwave and it worked for about 3 seconds and I heard some sizzling and cracking and the turn table stop. When I opened the door I could smell what I thought to be wire insulation that had burned. I tried it one more time and got the sizzling and cracking. I unplugged the microwave.

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The turntable is operated by a motor under the bottom of the cooking cavity. A plastic coupling that slides over the motor shaft, and that's what turns the turntable. In some ovens the coupling is a separate small piece that the glass tray sits on. Other models use a large wheeled plastic ring that rotates the tray.
The usual reason the turntable stops is that the coupling breaks or wears out. The motor shaft is D-shaped, and sometimes the plastic coupling cracks so it doesn't grip properly. Or the plastic wears so that the opening gets rounded and won't grip the shaft. Then even though the motor is running, the coupler doesn't turn. You can usually lift the coupling off the shaft to check it. In some ovens the coupler can only be removed by taking out the turntable motor.

Another probability is that the turntable motor has failed. In most ovens there is an access panel on the bottom that comes off to get at the motor. You can check the motor with an ohmmeter across its terminals to see if it's good. If the motor checks OK ,you can check for power at the motor when the oven is running. This is a little more difficult because it means there will be AC line voltage present, so caution is to the control circuit board.

Please get back to us if you have further query else please accept the suggestion.

Posted on Mar 24, 2011


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