Question about GE Spacemaker JVM1640SJ Microwave Oven

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Microwave seems to turn on when door latch is opened

Question for microwavesvc and others: I have a ge jw740 microwave with a push button door opener. By accident, I noticed that if I push the button halfway (before the door actually swings open), the microwave light, fan, and turntable come on suddenly. I can't tell if the microwave is actually heating, or if it's just the light, turntable, and fan that are working. I don't exactly understand the physical relationship between the door switch and the door latches, but why would this happen? As I depress the button to open the door, shouldn't all functions except for the interior light be automatically shut down? I'm just trying to find out of this is normal or not, or whether there is some malfunction that I should be concerned about (I don't want the microwave accidentally turning on in the future as the door is completely opened). Thanks in advance.

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Re: microwave seems to turn on when door latch is opened

What's happening is you are activating one door switch a little before the other, and that is causing your light, fan, and turntable to come on. The plastic parts are not perfectly rigid, so they flex a little when you press the button, and that causes the lag to be more apparent. Even if you press the door open faster and look really close, you may notice the light, fan, and turntable coming on for a split second. That's perfectly normal. The relay on the control board must also be turned on before it will actually be cooking.

Posted on Feb 23, 2007

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If it is working but not heating, then test the high voltage capacitor,the rectifier diode.or the magnetron. If all this are fine, test the control board.If turntable is not running check also the door switch.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, contact the seller here to purchase parts.

You can also order from MicrowaveSvc , they also provide parts.

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