Cannot set time on sharp microwave model R395F(S)

SOURCE: sharps microwave

The door switches go bad...little micro-switches. Check them for switching on and off. Some are closed when the door is open, some are open when the door is open. It could even be that the catch has moved out of adjustment. If that isn't the problem, you have to consider the brain board which is usually so expensive that the microwave is not worth fixing.