Charger broken general repair method
1, the most common charger is the power indicator light is not bright, no reaction. Open the shell will find that the safety tube burst, no safety tube will see the narrow copper foil on the back of the circuit board burned, that is insurance.
3, then measure the field effect tube 5N60C, you will find that all three feet breakdown short circuit. Replace all the rectifier diodes, weld the copper wire as thin as possible to the safety, and then replace the original oscillation tube with 10N60C, if there is no insurance resistance of the same resistance value, replace the original insurance resistance with a fine copper wire, anyway, the original insurance resistance is very small.
4, at this time to power on the test machine, will think that the fault has been eliminated, of course, there are also can be eliminated. But most of the time there is no response. Because there is also a power supply IC UC3842 in the power circuit, if the field effect tube is damaged, if the current is very large, UC3842 is also easy to burn out, which is easier to buy on the market, directly replace the test machine fault will be eliminated.