To repair a Panasonic microwave, reset any tripped circuit breakers, repair or replace any broken parts, and test the door switch, diode and capacitor with an ohmmeter. Common problems with Panasonic microwaves include power supply issues, defective magnetron tubes and malfunctioning door switches.
If a Panasonic microwave isn't working, check to make sure the device is switched on and the power cord is plugged into a working electrical outlet. Reset any tripped circuit breakers, and replace any blown fuses. Confirm that the microwave door is closed securely and that the clock on the microwave is set correctly.
If the microwave doesn't heat, the door switch, diode or capacitor might be defective. Use an ohmmeter to test these parts for continuity, and replace the defective ones. If the problem persists, check whether the magnetron tube has burned out. A magnetron uses high voltage current to generate the frequency used to cook food. A burned out magnetron tube must be replaced.
If a Panasonic microwave door doesn't open, its handle actuator, open lever or door latch might be broken. Replace any of the broken parts accordingly. If this does not fix the issue, check whether the door spring is broken, and replace it if necessary. The door spring is located inside the microwave and keeps downward pressure on the door hook.