Compared with the common microwave circuit, microcomputer microwave oven is with micro processing several relay chip circuit control instead of the figure of the timer and the power controller etc.. Because the computer board failure is relatively rare, so maintenance is mostly are still the main circuit. In fact, a microwave oven repair is not more than the ordinary type microwave oven to much, as long as the microcomputer board as the repair of a "parts", many of the problems will be smoothly done or easily solved. This "parts" easier to part and component failure is: relay, membrane switch, keyboard control panel power supply circuit, judge and repair are not difficult to. The power control relay contact damage or poor contact can not heating fault time control relay contact damage or poor contact can lead to not start power fault circuit damage often caused not start fault function of the microwave oven control failure is mostly film to open the key disc leakage, broken or poor contact caused by.YBbservice manual download site