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Glanz WD900B Microwave Oven Defect Circuit

2014-11-21 01:34  
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Glanz WD900B Microwave Oven Defect Circuit
By detailed analysis according to the circuit (shown in the picture), its is tested to know that the S1 would be disconnected when openning the oven door and it would be connected when closing the oven door. The S3 would connect the ac when openning the oven door and it would connect ab when closing the oven door. Which means the S1 is changed to be connected and the S3 is changed from connecting the a to c to from connecting the a to b when closing the oven door. Obviously, the wire connecting to the S3's C port is unnecessary. So if the S3 has been used for a long time and its switching performance has reduced, the S1 may has been connected before closing the oven door. Because the S3 has not changed its mode which is from connecting a to c to connecting a to b. So it could cause the short circuit. So it should remove the wire which connecting to S3 switch's C port (the practical object is a red wire and a blue wire are twisted together and then they are inserted to the switch's C port). That means it should disconnect the position of x in the picture. Then it would be normally used when it is electrified again.