Sharp MW won't shut off

Sharp Carousel II MW, 16 years old, keeps on heating unless door is open. When opening the door it shuts off like it should, light comes on, turntable stops- upon closing door I get a buzzing sound (magnetron?) but no light or turntable rotation, and it boils water as if it was on highest setting. Put in time and a reduced power setting, close door and it seems to operate normally, but it ignores the reduced power setting and heats at full power.
Short version- the magnetron is on full blast any time the door is closed.
Suggestion?

Sounds like it needs a new electronic board or PCB. Although I would consider a new microwave as your microwave is getting on in age and can be a danger to health or dangerous if something blows up.

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