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when the door opened , K3 off , K4. both switches should be synchronized theory thrown by the transformer coil redirecting the zero line, if K3 K4 before had thrown off the zero line ( even if it is early zero seconds ) , a short circuit can cause severe burn insurance. Similarly, in a closed door . K3 is turned on, the lag time from the zero line K4 , will cause a short circuit burned Insurance this insurance is easy to burn a door switch reasons.4bHservice manual download site
4bHservice manual download site
Micro switch connected to the top of the key pressed by the door hook a mechanical wear and tear , it will cause a timing error ( Remove both switches off the electricity meter to measure the situation well without exception , unlike some article describes a switch leakage of a serious kind of situation because it is good or bad ( and some randomness ) switch , so when the check fails, the moment would check it out. seems to be burning the insurance did not identify the real reason , simply replace one Insurance tube , due to lack of parts on hand , to not affect the use , as an emergency repair , only the zero line connected K4 lug ( white and yellow wire twisted together, yeah root thread ) can be pulled out ( unplug
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