Question about GE Profile Spacemaker Over-the-Range Microwave

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Microwave GE MD JVM140K Spacemaker yr= 1994 NOHEAT, DISP/TIMER OK

Microwave GE MD JVM140K Spacemaker yr= 1994
No heat, but display,timer,etc all work. Problem has gradually got worse over last several days.
If you enter time cook, only the timer counts down, then you cancel, and the oven light flashes briefly. Also it seems that whenever the oven light is off or out, the oven will DEFINITELY, not heat, and most of the time when it is on, oven will heat. If you slam the door, or tap up where the lite is, the lite will come back on, and then the oven may heat. I just tried it again, and after a few hours of no attempts, it worked, for several entries, eg: time cook 10s OK time cook 22S OK. Then finally no work again. I was thinking door switch for a while or at least a switch. But when it does not heat, and is just timing down, and I open the door, the timer stops it's count, indicating the switch is being read. I took the bulb out, and observed visually good filaments, then read about 50 ohms, so the bulb itself is OK. Maybe the bulb connector. Just what is the relationship between lite on and power on. Bulb on w/door open bulb on w/pwr,heating on.
I repaired an older Hotpoint about 20 years ago. I tracked it down to the power transisto or FET, that was connected to the bottom or 120V side of the HV xfmr primary winding. It had opened or shorted, I don't recall which.
Any help would be appreciated, as my wife just informed me, I don't eat til its fixed!!
Good time to start a diet I guess!
Thanx,
Robin Unruh
robin_unruh@hotmail.com

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Call GE answer center 1-800-626-2000
ask for tech help
Have you model # off your data plate ready.

Posted on May 10, 2009

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