There are two phenomena ignition cavity. First, due to the poor maintenance, the magnetron power output device (waveguide) serious the contamination, when the work of the first microwave oven heating oil, natural formation of high temperature ignition. The furnace chamber, the energy output device, clean vents, usually regular cleaning and maintenance, namely the elimination of ignition. Second, high-voltage wire and voltage doubler rectifier chassis too close or touching the shell, or if the high-voltage wire insulation poor play in case of occurrence of moist air that arc. Adjust voltage wires away from the chassis, add if necessary insulation board insulation board insulation.k5xservice manual download site