Question about GE Spacemaker JVM1640SJ Microwave Oven

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1800XL microwave hums

Hi there,

I saw you suggested putting a microwave on a test bench and disconnecting the lamp - how do I do that ?
Also you mentioned something about a stuck stirrer - how can I check that ?

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  • Will Beames
    Will Beames Dec 16, 2008

    Would either fault cause the HV transformer to make a humming sound and get hot ? I know it's not the transformer as I have already switched it out for a replacement. The humming stops if I open the door and starts as soon as I close it - the microwave does not need to be running for the transformer to hum but will hum when running also. The problem started when I closed the door after retrieving cooked food which leads me to a problem on the door closure circuit perhaps causing a dead short in the transformer ??? - however, I am no expert !

    If I am understanding you correctly, I should be able to detect changes in the lighting caused by the movement of the stirrer (in normal circumstances) but if I don't see any changes it could be a stuck stirrer ? Would I be looking through the glass in the door to see the changes or from another angle ? I still have the cover off.

    Thanks for your help with this.


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A test bench will have known-good power, but disconnectable and on a breaker and metered, for example.  The lamp will be disconnected by opening the thing up (hence, the workbench setting) and removing the lamp circuit connections in whatever way is most convenient.

The stirrer is often integrated with the output from the magnetron to the oven cavity; it's a microwave component that literally spins as the thing runs, and since the oven light is commonly on the same side easy to see moving or evidenced by changes in the back reflections from its vicinity.  That is, you would notice some periodic change in the internal oven illumination from the stirrer's motion, which might have stopped around the same time the hum started....

Posted on Dec 16, 2008

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