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GE Spacemaker shuts off after 15-30sec

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Hi everyone! I have a 7yr old ge spacemaker JVM1861SF001 that was off for a couple of months (was out

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Old 08-04-2009, 07:00 PM
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Question GE Spacemaker shuts off after 15-30sec
Model Number: JVM1861   Brand: GE   Age: 5 - 10 years   

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Hi everyone! I have a 7yr old ge spacemaker JVM1861SF001 that was off for a couple of months (was out of the country) and when I came back the first time I tried it on it shut off about 20seconds into running. When it shut off it was as if the breaker blew. It went completely dead, but would come back if I unplugged and plugged it back in.

The interesting thing is that it will run no problem if I don't put anything inside it. It only shuts off when there's a "load" on it - a glass of water, for example.

I started doing some research and it seems that the magnetron is one of the most commonly failing parts. I called GE and since the microwave is less than 10yrs old, they sent me a replacement magnetron. I replaced it, but the symptoms did not change at all.

I then borrowed a nice Fluke multimeter from work with a capacitance meter. The main magnetron capacitor measures exactly what the spec on it says - 0.91uF. It also doesn't show any physical damage.

I then moved to measure the high voltage diode, which also didn't show any physical damage, and I measured 11 meg-ohms in one direction and an open in the other direction. Is this what I should expect? From what I read online, the reading across the diode should be between 50k-200kohm.

I tried measuring the motor capacitor with opens on both ends, but it doesn't show any damage and the fan works just fine - I assume that is what the motor cap is for.

So I think I'm left with either a bad transformer, a bad sensor on one of these parts or a bad control circuit board. Is there an easy way I can test the transformer and the sensors? Seems that the sensors for the most part would just have some spec resistance over them, but I can't seem to find this info.

I would greatly appreciate any pointers/advice. Thanks in advance!


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