Hi @ron_co
The noise could be due to a faulty HV diode in the HV (high voltage) section of the circuit but it could just as easily be any one of the other components in the HV section of the oven
There are 4 main components in the HV section of the oven, the HV capacitor, the HV transformer, the HV diode and the magnetron.
The first 3 produce the high voltage supply that drives the magnetron to produce the microwaves that heat up the food.
Open up the oven and check what the components look like.
With a lot of ovens the greasy air created during cooking is sucked in by the fan and ends up on the components which isn't too good considering the high voltages involved, e.g. arcing etc due to resistive connections created by the grease covering that shouldn't be there
Here's the mini manual for the oven that may also help, as long as you have a clamp ammeter and a high voltage DMM that is. See the flowchart for how to test and find out what component may be faulty.
Be safety aware when working in microwave ovens. The HV capacitor can store >5000V DC for months, even if the power to the oven has been disconnected for this length of time. This amount of voltage can seriously injure you. The HV capacitor needs to be correctly discharged as soon as it can be accessed after the cover has been removed from the oven and before any further work is commenced.
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