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Electric Scooter Charger Common Fault
May 15, 2018

1: high-pressure fault 2; low-voltage fault 3: high pressure, low pressure are faulty. The main phenomenon of high-voltage fault is that the indicator light is off. Its characteristic is that the fuse blows, the rectifier diode D1 breaks down, and the capacitor C11 bulges or bursts. Q1 breakdown, R25 open. U1's pin 7 is shorted to ground. R5 is open and U1 has no starting voltage. Replace the above components to repair. If U1's pin 7 has voltage above 11V and pin 8 has voltage 5V, U1 is almost normal. Should focus on detecting the Q1 and T1 pins for soldering. If Q1 is continuously punctured and Q1 is not hot, it is generally D2 and C4 is ineffective. If Q1 is punctured and hot, there is usually a leakage or short circuit in the low voltage part. If the Q1 is too large, the output pulse waveform of the UC3842 is not normal. The switching loss and heat increase greatly, causing Q1 to overheat and burn. Other phenomena of high-voltage faults include indicator light flashing, low and unstable output voltage. Generally, the pins of T1 are soldered, or D3 and R12 are open, and the TL3842 and its peripheral circuits have no working power supply. Another rare high-voltage fault is that the output voltage is higher than 120V, which is generally U2 failure. R13 is open or U3 breakdown causes U1's 2 pin voltage to be pulled low, and 6-pin gives an ultra-wide pulse. At this time can not be a long time power, otherwise it will seriously burn the low-voltage circuit. Most of the low-voltage faults are caused by the charger being connected with the positive and negative poles of the battery, causing the R27 to blow and the LM358 to break down. The phenomenon is that the red light is always on, the green light is off, the output voltage is low, or the output voltage is close to 0V. Replace the above components to repair. In addition W2 due to jitter, the output voltage drift, if the output voltage is high, the battery will be overcharged, serious water loss, hot, and ultimately lead to thermal runaway, rechargeable batteries. If the output voltage is low, the battery will be undercharged. When the high and low voltage circuits are faulty, all diodes, transistors, optocoupler 4N35, FET, electrolytic capacitor, integrated circuit, R25, R5, R12, R27, especially D4 (16A60V, fast) should be fully tested before power on. Recovery diode), C10 (63V, 470UF). Avoid blind energization to further extend the scope of the fault. Some charger output terminals have special functions such as reverse connection and short circuit protection. In fact, the output is more than a relay, in the reverse connection, the case of short-circuit relay does not work, the charger no voltage output. Some chargers also have anti-reverse and short-circuit protection functions. The principle of this is different from that described earlier. The low-voltage circuit's starting voltage is provided by the rechargeable battery, and a diode is connected (anti-reverse). After the power supply is normally started, a low-voltage power supply is provided by the charger.

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