Question about Sunbeam SBM1000 Microwave Oven

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Microwave will not stop

My Sunbeam won't turn off. I can set the clock and set the timer to heat something up and it is ok, the timer rings when the time is up but as long as the door is closed, the light stays on and the glass tray turns with a fan going. This only stops when I unplug the machine. Help?

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Sounds like you have a bad door switch.  Will have to take control panel off and test switches resistance to see if they are opening and closing properly.  If a switch is stuck in or bad the microwave thinks the door is closed.  This is where I would start.  Let me know what you find.

Posted on Oct 13, 2007


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Place a glass pie plate in the oven with about 1/8" deep water in it. Turn the oven on high for about 30 seconds. If you get one small spot with intense boiling, the stirring antenna at the top of the oven is not rotating. It's usually driven by a small 60 RPM synchronous motor. To get at it, look for a pull-out plastic locking pin that holds the plastic dome or plate to the tope of the oven cavity. You may need to rotate the cover counter-clockwise a fraction of a turn to unlatch it. Sometimes greasy food vapor gets in there and gums up the bearings. Clean very thoroughly, but be careful not to bend the antenna blades. When you reassemble, make sure the antenna is properly seated in its bushing and engaged on its drive shaft. Repeat the test to see if you have even heating.

If you see no evidence of heating anywhere in the oven, check to see if the door switch in series with the transformer is malfunctioning. If the door switch is OK, you'll need a high-voltage measurement probe to determine whether the magnetron has failed, or (more likely) the high-voltage capacitor or diode is bad.

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