Troubleshoot the charger
Sep 16, 2019| Troubleshoot the charger
1. After the battery and power supply are connected, the power indicator and test indicator light are on, while the charging and full indicator lights are off, no voltage is output, and the battery cannot be charged.
Analysis and repair: This kind of fault is mostly caused by the charger switching oscillator circuit not working. During the actual maintenance process, it was found that the switch tube VT2 and the resistor R6 were the most damaged. Under normal circumstances, the charging circuit of the battery E has a low operating voltage, and the probability of component damage is not very large, that is, the probability of damage of the circuit after the secondary of the switching transformer T1 is not large.
2. After the battery and power supply are connected, the status indicators are normal, but the charging is not charged or the charging time is long.
Analysis and overhaul: This kind of fault is mostly the damage of the triode VT3 (8550). After replacing it with a normal pipe, the fault can be eliminated. If the triode VT3 is normal, use the meter to measure the voltage across the capacitor C3 (100μF/16V), which is normally about 8.5V DC. If the voltage is normal, the resistor R7 or the integrated block IC1 should be checked. The normal parameters of the pins of the integrated block IC1 are shown in the attached table. If the voltage is low, then measure the secondary output voltage of the switching transformer T1, which is normally about 5.5V AC. If the voltage is normal, the capacitor C3 or rectifier diode VD3 is damaged. If the voltage is low, check the switching transformer T1 and its pre-stage components.
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