1. When you insert the charging gun, the display screen does not light up; 2. Press S1, S2 switch, then the display light up,according to the table data, judgeCharging pile motherboard is not good;
3. Resistance is to measure the resistance inside the charging gun, when the charging gun button is pressed and when the charging gun button is not pressed The resistance value of the stun gun button is different. Also refer to the table;
4. Voltmeter and ammeter are used to measure whether the charging line is short circuit and there is no power output.