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it seems that the microwave needs a new mag tube and diode.

Model Number
jvm1430wa001
What have you tried so far?

I replace the mag tube and diode. i checked power coming out of the relay board 120 v and turned it on and drops.

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Hi. Did you already replace the magnetron? How many amps is the microwave pulling? IF you get over 3 amps the issue is on the high voltage side and I would replace the magnetron and diode. If you get under 3 amps you have a low voltage issue, but with the readings you are getting at your relay it would appear your door switches and control are good. If you already replaced the magnetron you could have an issue with the transformer, or a faulty magnetron.

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