At this point microwave oven door is closed, the cooking time is preset, touch the button a mixed grill or mixed grill key 2 and the start button are not working. Inspection FU, S4 and power connectors are normal, then check RY1, RY2, RY3 no exception, microprocessor IC01 suspect there is a problem associated circuitry such as drawings.Nwvservice manual download site

First, measure the 5V power supply is normal, then measure IC01 voltage supply terminal 42 feet 2.4V, normal to 5V. Disconnect power 42 feet, 42 feet on the ground resistance measurement is small, normally when 6.8kΩ, no leakage phenomenon detection C3 , judging IC01 internal damage may be caused by a fault after the test changed IC01, power test, the mixed grill microwave normal troubleshooting.Nwvservice manual download site