First detection of transformer high side components, found magnetron , high voltage capacitors, high voltage diodes are intact, there was no inter-turn short circuit transformer . Replaced with a 100W light bulb fuse , plug in the power , microwave issued a " Hello , thank you cards using Heygey electrical" tone , shiny screen can display , indicating that the phenomenon of temporary hard not short circuit occurs . Then replace the fuse , microwave cooking operation , normal. Burning fuse did not find the cause . During repeated operation , once when you open the door , because the action is not simply, I saw a flash of fire oven cavity , the display is off, I knew it was a blown fuse . Short-circuit failure occurs when the door is certainly related with the door switch , along this line of thought to check, finally found fault element is a door monitoring switch ( circuit icon K4. Door has three switches on the lower is the central a poor , good times and bad , which is a single-pole double -throw switch , "knife" connected to the firing line , throw the door open when the zero line , throw one end of the high voltage transformer primary coil when the door is closed ( see photo ) .

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