Good morning comrades, in the end I found the fault: it was a window that has a transparent glass where it illuminates the lamp to see inside the microwave room which activates a microswitch, which was why it was stopped to stop a minute. This window is driven by a geared motor (5 to 6 rpm) which makes a considerable force and the cam that drives the micro, the edge that drives the key is very pronounced and in turn the piston that has the micro, also ends the part a straight line that joins the radius for the other side in a line that would force this flap and therefore broke where this window is attached to the engine.