This failure phenomenon shows that light can be heated , but the microwave heating system is not possible fault location are:wujservice manual download site

( 1 ) R42 , or microwave relay VPC damage resistance becomes large. Microwave relay coil with a multimeter to measure the resistance in lOOΩ-350Ω normal. If too small or 0Ω short- circuit or infinite , can be replaced with the specifications of the relay ; If the measuring coil is normal, check RY3 contacts are not energized ablation , microwave system does not work . Use a knife to scrape If ablative ablative place, the contacts can be a good conduction. Resistors R42 resistance becomes larger , resulting in the relay coil in series with VPC not suitable pull current, the relay station VPC does not suck , its contacts RY3 not closed microwave system does not work , use the same specification 15Ω resistor replacement troubleshooting .wujservice manual download site

( 2 ) transistor 04 open ; R17 resistance becomes larger ; D3 leakage can also cause this failure.wujservice manual download site

04 open, causing the pull VPC microwave relay path is cut off, their contacts RY3 not closed and blocked the microwave system circuit . R17 resistance becomes large, so that the base bias current decreases Q4 , Q4 is turned on and can not block the energization of the relay VPC . Freewheeling diode D3 leakage, lack of proper microwave relay pull-in voltage and not pull its contacts RY3 not closed , cutting off the microwave system circuit . The replacement of damaged components can troubleshooting.wujservice manual download site

( 3 ) the magnetron , high voltage diodes , capacitors , high voltage Insurance damage , can also cause this failure. If you can pull microwave relays and contacts RY3 conduction resistance is OΩ, can turn on microwave system circuit , compared to the high voltage circuit failure.wujservice manual download site