I have a Panasonic NN-GS597M microwave. When using its microwave heating fu nction, it stops after 4 seconds regardless of the setting is H/M/L. In thi s 4 seconds, there is a slight "tic tic" sound near the a/c rectifier and t he large transformer of the inverter (they seat close to each other). I man aged to find an inverter board and replaced it, but didn't solve the proble m. So it must be something else that cause the problem.
The rectifier board is just simple R, C, varistor and self recovering fuse, which are unlikely to have any problem. For magnetron, I've measured the r esistance of the 2 leads. With my DMM at 200ohm it reads 0.3. Each lead is open to the case of the ovan. So I think the magnetron is ok. So what else can I check to resolve the problem. Please help.
NB.