Microwave Diode

The microwave diode converts the alternating current (AC) power output of the transformer to direct current (DC), doubling the voltage to nearly 5,000 volts. This high voltage powers the magnetron to heat the food or beverage placed in the oven cavity. If the diode is burned out, the magnetron will not receive enough voltage to operate and the microwave oven will fail to heat

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On some models, you can reach the diode by first opening the microwave oven door and unthreading the screws to release the venting. Next, you can unthread the mounting screw or screws securing the control panel and lift the panel up to detach. Behind the control panel may be an access panel that, when removed, will allow you to access the diode to test or replace. Other models will require you to fully remove the appliance shroud or cover before you can reach the diode. On stand-alone models, this can be as straight-forward as unthreading the mounting screws securing the cover from the side, top, or rear of the appliance. However, if the microwave if mounted to the wall under a cabinet, you will need to completely uninstall the appliance in order to remove the cover. While this process can differ depending on the model, here are 25 typical steps you can follow to successfully replace the diode: