According to the fault analysis of phenomena, microwave control circuits may be faulty, the relevant circuit as shown in the drawings. Microwave oven door is closed at this time, the cooking program has been organized, press the start button after the microprocessor IC01 14 feet high output, Q13 via D11 that the high conductive collector goes low, Q14, Q6 saturated, Q4, Q5 is turned on, control of microwave relay RY3, grill control relay RY2 are turned on, the magnetron and grill heating MG H to electrical work, while, IC01 oven lamp control signal terminal ② pin output low, Q7 is turned on, the oven lamp control relay RY1 is also connected to the circuit, the furnace is lit the lamp L; Meanwhile, fan motor and turntable motor M1 M2 start running.gENservice manual download site
 gENservice manual download site
Off, check the microwave control circuits Q4, R14, R17, R42, D3, RY3 other components found R42 circuit, resulting in RY3 cause of the failure can not be connected to the circuit. Replace R42, troubleshooting.gENservice manual download site