By the failure phenomenon , oven lights, rotating turntable and fan , microwave oven should be heated state . Thus in the case of a microwave oven door open work that will cause a lot of microwave leakage , and that is no joke ! So , dare test machine. First open the housing , disconnect the high voltage transformer primary one end , then power test machine , measuring high voltage transformer primary gateway between two lead voltage is zero , indicating that although the surface microwave oven in a heated state , and in fact did not energized high voltage transformers , magnetic control did not have a microwave , So this is just an illusion.Zr5service manual download site
But why have the above symptoms , does the door switch dislocation caused dysfunction ? Check the relevant micro-switch no exception. Remove analyze the supplied circuit diagram , the part of the circuit shown in Figure 1. Which is the first door switch S1 , S3 as door monitoring switch , RY1 for the oven light control relay make contact switch , RY2 microwave control relay make contact switch. S4 magnetron self-resetting circuit breakers, usually in the ON position .

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