This microwave is sometimes just plug in the power supply , the bright lights and the furnace turntable rotation immediately , but not heat , press the " Cancel" button on the front panel is invalid. Sometimes in the normal heating process can also occur suddenly show time suspended , but the microwave oven is still at work and can not be heated .CHrservice manual download site

According to the symptoms , suspected faulty computer board . Then , remove the computer control panel , the second door interlock switch two leads shorted S2 , and then to the computer board is energized, after many trials board computer button operation and heating functions are normal , indicating that the PC board should be good. In the case of electricity , the short point S2 inadvertently disconnect between the two lines , along with a suction hear the chorus board relay , tested for the oven light control relay RY1 pull, then microwave on a careful analysis of the circuit diagram ( see figure ) . When the door is normally open , S2 is disconnected , the furnace control board computer lights relay , RY1 normally open contact closure so that the furnace bright lights , computer boards prohibit heating starts, the first time due to the door interlock switch Sl is disconnected , the fan motor and turntable motor will not work without electricity . However, when the microwave oven door switch S2 and the presence of undesirable closed , RY1 is closed at this time the furnace bright lights , and a first door interlock switch S1 is closed , the fan motor and turntable motor will work if Microwave has entered into a heated state the same. But this time the computer board undetectable S2 is closed and the heating operation is prohibited , namely microwave control relay RY2 not pull , it will not be heated , which appeared timed display does not change and by eliminating key invalid fault illusion. In fact, a closer look reveals that when such a failure occurs in the lower right of the screen there is no microwave cooking red symbol appears .

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