GE JVM1650 When microwave energizes after approx 2 seconds pitch of device change and does not heat at all, believe it to be magnatron. This is a model that falls under service bulletin RA-08-02 and magnatron has been replaced 2 times. Is there a way to ensure it is the magnatron and is it still under warranty??

there are two censors inside one high heat one low heat they can be checked with a meter if both are good its a bad magnatron and exceeds its worth

one of the internal door switches, the high voltage circuitry or the circut board may have a problem to resolve this you need a qualified appliance technician

sounds like possible magnatron or diode thats the case its not worth repairing. but if your handy then google model nuber and get the part be extreamly careful because of the power capacitor holds extream volts. turn off and allow to sit 15min before working on

Saw something like this happen when a magnetron gasket was bad and Rf energy was interfering with the control board. Could also be a connection problem in the power circuit, acting like it was unplugged momentarily. Heavy draw from the High Voltage circuit when in cook mde. Eric

sounds more to me like a control bd issue or power flucation magnatron or element wont affect the display

My magnatron went out on my 2003 model ge replaced the part but I had to pay the labor.

If it's been arcing for years, I would suspect your waveguide is damaged and cannot be repaired in addition to the magnetron.

You would have to pay labor. It's generally about $75 to visit you and $90 to do the work.

GE Customer Service is here in case you want to see if they will cover labor or replace the oven, but I doubt it.

Good luck.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

My magnatron went out on my 2003 model ge replaced the part but I had to pay the labor.Mine had a ten year warranty on parts.

one of the internal door switches, the high voltage circuitry or the circut board may have a problem to resolve this you need a qualified appliance technician

Magnatron is suspect. Need to put a voltmeter on the input (primary) side to the high-voltage transformer (big heavy iron thing in there) Should be getting 120Vac when it goes to cook cycle. Don't touch the other (high voltage) side of this transformer. If the power is there, you are looking at replacing either the magnatron or the high-voltage capacitor and diode. Its affordable if you do it yourself - buy the part on EBAY - lookup "universal magnatron"
Hope ya fix it!