If the above test results are normal, we should then test the four rectifier diodes of the power supply (Test Point 2). In the normal state, the forward resistance of the diode is a few k (tested with a multimeter x 1k block), and the reverse resistance is close to infinity. If you find that the test result is abnormal, you need to replace it. After checking down, the next thing to do is to test the DC resistance of the power supply (test point 3). The normal resistance is also several k. If the resistance is zero, there is a DC short circuit. There are many causes of DC short-circuit, such as the short-circuit of the filter capacitor, the damage of the power oscillating tube, and the damage of the oscillation integrated block and peripheral circuit may cause short circuit. Here, it should be noted that before replacing the power oscillating tube, it must be determined that the oscillating integrated block and the peripheral circuit are normal, otherwise the power supply tube will be damaged again.
Excluding the above-mentioned problems of switching power supply , it shows that most of the faults exist in the oscillation control circuit, sampling feedback circuit or load. At this time, we should check whether the power supply circuit of the oscillating manifold is normal (test point 4). The normal voltage should be around 10V (special remind: Because the test voltage should be conducted under power, and the power board has high voltage Mains electricity, so pay special attention to personal safety, do not try to directly touch any part of the power supply). If there is no voltage or low voltage at this point, first check whether the buck resistor is damaged; secondly, check whether the oscillation integrated block and its external power supply circuit are normal. If no fault is found in the peripheral circuit, it is recommended to replace the oscillation manifold. Of course, sometimes the power supply cannot output the voltage normally, and it may also be caused by the short circuit of the load to cause power protection. For this power supply, we only need to remove the output line and check the output voltage is normal (Test Point 5) to determine the fault location. After the previous troubleshooting, the feedback circuit part should also be checked in the end. Generally speaking, this part of the fault is mainly concentrated on the optocoupler and its amplifier circuit, and special attention should be paid.
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