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The Problem you Having is dirty Door Switches,Get some Electronic Contack cleaner from the Hardware Store,Make sure it has the little straw to Extend the Spray,Open the Door of the Microwave Look at where the Door Closes youll see Tiny Micro switches,*Note UNPLUG POWER FIRST
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Microwaves do normally 'turn on', in that the light comes on and the fan starts running. If the turntable starts turning and it is emitting microwave energy, then you need to take it for service or replace it. To me, it sounds fine.
Key clue is table does not move---All microwaves with a table have a lever switch that is engaged when door closes--only can get at from inside the unit----it prevents the unit from operation if door not closed.
What happens from closing door a lot is the switch with a lever arm can come loose or even if snapped into a plastic holder break out of the holder.
some switches are normally closed "short position" press switch "open" it will be labeled NC on the one side, "stands for normally closed" and others will be NO "stands for normally open" press switch "short" if there is no change in readings when you press switch it is defective.
What's happening is you are activating one door switch a little before the other, and that is causing your light, fan, and turntable to come on.
The plastic parts are not perfectly rigid, so they flex a little when you press the button, and that causes the lag to be more apparent.
Even if you press the door open faster and look really close, you may notice the light, fan, and turntable coming on for a split second.
That's perfectly normal.
The relay on the control board must also be turned on before it will actually be cooking.