When you repair the power supply part and repeatedly damage it after replacement, the switch tube burst as soon as the power is turned on. Don' worry, of course, the maintenance expert has experience, it is not a problem, but the long-term use of this tester can bring you high efficiency when repairing the power supply. Save working time! You should first test whether the switching former is short-circuited between turns. The test is very simple! Connect the instrument to the 5v power supply, and the tester has been upgraded to use the USB interface of the 5v charger for Android phones, so this test The instrument is not equipped with a power supply when it is sold. The customer should prepare it by himself. Please be aware that the two fish plagues are connected to the winding ends of the former coil with a large number of turns. Because all the windings of the former are on the same pair of magnetic cores! So as long as there is a group of green lights, it proves that the whole former is not short-circuited! It is not necessary to test each group. Note, this tester can only test high-frequency with magnetic cores! It can also test step-up with magnetic cores, and can not test power frequency with steel sheets! It can also be tested online, (but the power board is not live! It can be reflected Check whether the output load of the former is normal or there is a short circuit. Finally, remove the former again and make sure again. If it is still short, you can carefully disassemble the former and use the same No. rewinding. High-voltage package can also be tested! Test 110v winding Note, this tester can only measure short-circuit between coils! Most high-voltage packages are short-circuited coils, but there are also poor insulation or high-voltage rectifier diode breakdown. This instrument is insulated Faults and rectifier diode breakdown cannot be detected. Please be aware of this. The tester uses a normal