To check the status of the fan as well as the status of the turntable motor you can do it as follows disconnect the terminals or wires that connect the fan motor and turntable motor to the oven and instead you will connect a cable with 60w or 100w bulb in series and plug and you can connect directly to the ac line if in case the motors are short or stuck the spotlight will turn on its intense brightness but if the motors are fine you will see them work and also the bulb will turn on At a dim brightness with this test you can check its status, now in the oven with a voltmeter (before disconnecting the primary of the HV transformer) you will connect the tips of the voltmeter on the wires that you disconnected from each motor and you will start working the oven is working when you have to mark the voltage of the line of your country with which it feeds the engines if there is absence of that voltage check in the blades of the oven there should bring you a diagram and specify if there is any fuse for the motors or a thermal in series to the motors that may have been damaged and that part would only be replaced and the fan will return to work as well as the turntable motor and another check the condition of the door swich that mark continuity and no resistance since they also contribute to these motors work and being these switches altered the motors do not work properly or flat do not work I hope I could help you with your team