This rectifier assembly (diode) is part of the microwave's high-voltage circuit, converting alternating current to direct current to power the magnetron. It works in conjunction with the high-voltage capacitor to double the transformer's output voltage. Replace this part if the microwave runs but does not heat, or if testing reveals the diode has shorted or opened.
Do-It-Yourself Stories from Customers like You
Everything seemed to work but it did not heat anything and made a loud buzzing noise Hugh H. • Duluth , GA • February 18, 2017
The rectifier (a high-voltage diode) connected to the magnetron that supplies the RF energy that does the heating in the microwave was shorted. The shorted rectifier was found by using a multimeter to measure resistance which should be very high in this type of diode. After replacing the rectifier the Frigidaire microwave oven heated food normally. I thank AppliancePartsPros for sending the part so promptly.
The real problem with this repair was getting this over the stove microwave oven out of...
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