Use a multimeter to detect faulty circuits and locate faulty components
Capacitance detection
Step 1: Set the multimeter to the capacitance range and select the appropriate range
Step 2: Place the multimeter probes at both ends of the two component pins
After testing with a multimeter, we can clearly see that the small capacitance was measured by the reading. Read the reading on the multimeter, and then compare the actual values marked on the capacitance. If these two values are close, it indicates that the capacitance is normal. Our capacitance is labeled as 10uf, and the measured value is 13.8uf, which can be said to be close.
Looking at the second picture again, it is clear that the reading of the multimeter is directly zero, which is enough to indicate that the capacitor of this drum has indeed burned. If you want to repair it, you can replace it with a capacitor with the same parameters.
Diode detection
After discussing capacitance, let's move on to diode detection. The diode detection method is a bit simpler than capacitance detection because our multimeter comes with a diode stop and only has one position, so we don't need to consider the range. We set it to the diode stop and then connect the positive pole of the multimeter to the anode of the diode, while the negative pole of the multimeter is connected to the positive pole of the diode, If you see a reading on the multimeter display screen, it indicates that the diode in the circuit is normal (some multimeter will sound) and has not been broken down.
Inductance detection
Inductance is a very important component in mobile phone chargers, and almost every charger cannot do without it. Therefore, it is necessary for us to learn a method to detect inductance. "Inductance", which we learned in high school, is equivalent to a short circuit to direct current. We can make good use of this and combine it with the diode block on a multimeter.
We all know that if the diode block red and black probe is directly connected to a multimeter, it will make a sound, and if it is not connected to a multimeter, it will not make a sound. Similarly, if it is connected to an inductor, it is the same. Try it out, everyone should note that before connecting, except for the buzzer, there is only one diode symbol in the upper right corner of the multimeter display screen.
