The following are the main causes of common failures in the maintenance of electric chargers。
The fuse pipe is melted to see whether the outer surface of the element on the circuit board is burned, electrolytic fluid spills and odors, to measure the end-to-end electrical resistance value of the power input to see whether there is a local short circuit, to detect whether the power filter is properly charged, whether the switch power tube is damaged, and whether the components of the uc 3842 and their surroundings are burned, and to replace the element damage。
The dispersing fan does not turn, the triode of the fan is controlled with a large-scale meter, which, if it is not broken, may be broken, but may be connected to the 12v direct current power test, as well as to see if the alien is stuck, swinging the fan's wire fan, indicating that there is a broken wire or bad contact within the wire, and exchange the element as appropriate。
Lightning, first welding the circuit board, then checking the output end for sample resistance, replacing the electrical resistance with 0. 1 euro, 3w power。
The output voltage is high, with more than 70 voltage voltages higher than 70 v, the charger does not turn the light, the welding circuit board is filled, and the pv coupling, the 431 baseline pressurizer, cannot be replaced。
Squeeze, heat, charge inadequate, electrocution of large capacity voltages below 300 v, usually failure of the capacitation。
Electro-injection-free, electro-referral, large cap 2 end with 300 v voltage and slowly declining, to detect whether the large diode at the end of the output is punctured and welded。
Electro-lighting, welding transformers, each of which leads, cannot check whether 431, the pv coupling, the output part of the diode is short, the transformer's magnetic core is loose, and the power input part 10 ee small resistance is open or replaced 3842。
The output is low and hot, and if the output voltage is less than 40 v and the power tubes, transformers are hot, it is generally the transformer。
Electro-lighted 2 red lights, tester, empty voltage normal, exchange 358 or 324 for a new test。
Electronization is non-outputable, it can be activated normally, the lights are normal, the output lines are replaced, and the chargers with relays are directly short circuit relays。
The power is not activated and the plug-in large cap has 300 v voltage, the pull-out of the power is another measure of the large cap 2 end or 300 v voltage does not drop, and when the capacitor is discharged, it is replaced by the start-up resistance。
The power is not activated, the plugged large cap 2 ends with 300 v voltage, the pullout of the power large captivated voltage is slowly decreasing, the circuit boards are checked for welding and welding is replaced by the 3842 test machine。
Serious heat, change fan。
The output voltage is unstable and welded circuit boards are filled and the output end is replaced by 63v470uf capacitors。
Charging does not turn lights, monitors data and replaces 358 or 324 test machines。
Charges are unstable, test instruments are used to detect data and then input the output power lines and welding panels。
The electric burn insurance, checking whether the power tube was punctured, replaced all 4 whole-stream diodes with a new test machine。
Charges do not turn lamps, new batteries are charged at no greater than 59. 5 and batteries are charged at no more than 58. 8 for about six months。
The output voltage is low, the welding circuit board is used to replace the input and the output with a large capacitor。
For the maintenance of common malfunctions, due to the high voltage and current state of electrical chargers entering circuits, the failure rate is high in the high voltage large current contour triodes, filter wave capacity, switch power tubes, etc. The second most vulnerable are current diodes in the whole flow segment of the output, the protection of the diodes, filtering capacitation, restricted current resistance, etc. And then the feedback part of the pulse modem controller and the protection of the circuits。
The breakout of the fuse tube usually indicates short circuits or overflow failures on the charger's internal circuit, which may be due to prolonged high voltage, high failure rate of the large current working inner parts, or voltage fluctuations and surges in the electrical grid。
The circuit board components are first examined for maintenance, relevant electrical resistance, capacitors, diodes, power tubes, etc. The lossable elements are whole-stream diodes, power filters, switches, etc。
No direct current or voltage output is unstable, and if the fuse is intact but is loaded without output, the reason may be overpressure, overflow protection circuit openings, short circuits, shock circuits are not working, power loads are overweight, high frequency filtration filter wave circuits are full-stream diode plugged, filter capacity leaks, etc. Hf pulse transformer units are first measured during maintenance, and direct current voltage at the output end is measured at zero, excluding diode piercing, load short circuits, and also to detect damage to components of high frequency filter circuits. Watch out that welding, welding and welding also cause such failure。
