GE microwave JTP90SP3SS. It also won't heat food. We just replaced the turntable motor, but that didn't fix the problem. Does anyone have follow-up steps.
It's the top (connected) part of a microwave-oven combo, so would like to repair if possible.
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@scastle275, have you checked the door switches? I've had a lot of microwaves over the years and whenever I have problems with them, 90% of the time it's a faulty door switch. There are usually two or three of the little micro switches that tell the microwave when the door is open and closed. If one of them isn't working, the control circuits could easily think the door is still open and refuse to turn on power to the turntable and klystron tube.
Although you can usually tell if they're working by examining them, I've had a couple that looked okay but an ohmmeter confirmed that it wasn't actually working. There are often both Normally Open (NO) and Normally Closed) NC switches; you can tell which by the position of one of the terminals.
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Hi,
Here's the mini manual for the microwave oven that may help.
It describes how to test all of the components in the microwave section of the oven. It may be that one of the door interlock switches is the problem but you may have to do further testing if they all test OK as it could also be the control board for example
Be safety aware when working in microwave ovens. Even though this model has a feature where the HV capacitor is discharged after the oven is turned off, ensure that you manually discharge it again anyway, just in case. The mini manual describes how to do this.
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