Maintenance method: first look at the circuit board above the various components to see whether the appearance of these components were burned or electrolyte overflow, smell - smell or not ignorant. And then measure the power supply input resistance, if less than 20OkΩ, then the rear side of the local short circuit phenomenon, and then were measured 4 rectifier diodes positive and negative resistance and resistance of the two current limiting resistor to see whether the short circuit or burn ; And finally measure the power supply filter capacitor can carry out the normal charge and discharge, switching power tube is damaged, UC3842 and the surrounding components are breakdown, burning and so on. It should be noted that, because the road is measured, it may make the measurement results are wrong or cause misjudgment, so if necessary, the components can be measured down welding. If this is still the case, measure whether the input power cord and the output power cord are internally shorted. In general, in the fuse fuse failure, rectifier diodes, power supply filter capacitor, switching power tube, UC3842 is a wearing parts, the probability of damage up to 95% or more, to focus on checking these components, it is easy to troubleshoot.
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