The Main Cause Of Low Output Voltage

    4.1. The performance of the switch tube is degraded, which causes the switch tube to fail to conduct normally, which increases the internal resistance of the power supply and reduces the load capacity.

    4.2, 300V filter capacitor is bad, resulting in poor power supply load capacity, the load output voltage will drop when connected.

    4.3, switching power supply load short-circuit fault (especially DC / DC converter short circuit or poor performance, etc.), at this time, first disconnect all the load of the switching power supply circuit, check whether the switching power supply circuit fault or the load circuit is faulty. If the load circuit is disconnected and the voltage output is normal, it means that the load is too heavy; or it is still abnormal, indicating that the switching power supply circuit is faulty.

    4.4. Defective switching transformer not only causes the output voltage to drop, but also causes insufficient excitation of the switching tube to damage the switching tube.

    4.5, output voltage terminal filter capacitor or rectifier diode failure, etc., can be judged by the replacement method.