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Hello, in that part of the circuit if it did not have a resistance of 0.2k or 200 ohm, at the time the monitor switch failed, the input fuse would immediately fly when it was short-circuited neutral and phase just after opening and closing the oven door, having that resistance the thermal input fuse will open more slowly due to heat or temperature, greetings.
This resistance has the function of melting the input fuse with a smaller spark than a frank short circuit, as in other microwaves.
The function of blowing the fuse is in case the door switch assembly does not act correctly and thus prevent the microwave from starting with the door incorrectly closed.
Regards.