From：CTECHI GROUP Limited Release time：2019-09-04
Overview：The fuse tube is blown: carefully check the components on the circuit board to see if the appearance of these components is burnt or there is electrolyte overflow, smelling or smelling
48V lithium battery charger common faults and maintenance methods
1. The fuse tube is blown: carefully check the components on the circuit board to see if the appearance of these components is burnt or there is electrolyte overflow, smelling or smelling; then measuring the resistance value of the power input terminal to see the partial short circuit phenomenon; Then measure whether the power supply filter capacitor can be normally charged and discharged, whether the switching power tube is broken, whether the surrounding components are broken down, burned, etc., if the components are damaged or replaced.
2, no DC voltage output or voltage output instability: First, use a multimeter to measure the damage of each component of the high-frequency pulse transformer, eliminate the high-frequency rectifier diode breakdown, load short-circuit situation; then measure the DC voltage of each output Is the power supply control circuit faulty; then use a multimeter to statically measure whether the rectifier diode and the low-voltage filter capacitor in the high-frequency filter circuit are damaged. If the above components are damaged, replace the new components to eliminate them.
3, no DC voltage output, but the fuse is intact: first determine whether the charger's variable control chip is in the state of Wang Zuo or has been damaged. If these feet are not broken, and the charger still does not start normally, it means that it is damaged and should be replaced directly.
4, the cooling fan does not turn: first use a multimeter to measure - under the control of the fan's triode is damaged, if the tube is not damaged, it may be the fan itself is damaged, you can pull the fan off the board, and then connect A 12V DC (note the positive and negative poles), to see if it is rotating, but also to see if there is any foreign matter stuck; if you swing the wires of the fan, the fan will rotate, indicating that there is a broken wire or poor contact of the connector inside the wire. Replace the components according to the above situation.
5, the power does not start: plug in the power supply, the large capacitor has 300V voltage, unplug the power supply and measure the large capacitor 2 end or 300V voltage does not drop. After discharging the capacitor, replace the starting resistor. The starting resistor is in the power input section, with a resistance of 150K and a power of 2W.
6, the output voltage is unstable: first repair the circuit board once, after the test machine, and then the output capacitors and capacitors can be replaced by a new test machine.