The way to repair electronic products is to identify the faulty location and eliminate the fault. There are many kinds of faults in electronic equipment. Some faults can be judged superficially; some faults require a little inspection and some simple repairs can restore normal operation; some faults must be checked repeatedly; some faults need to be checked with special instruments. Generally, electronic products have dozens, hundreds, or even thousands of components. It is very difficult to find faults in each component by checking them. The following introduces the maintenance methods of tantalum capacitors .
1. The direct inspection method is a preliminary maintenance method. First inspect the tantalum capacitor according to the fault phenomenon. Sometimes the fault can be found. Use your eyes to observe that a certain tantalum capacitor of the device is burnt, a certain tantalum capacitor lead falls off, the solder joints are loose, cracked, etc. When the power is turned on and checked, there are flashovers, smoke, etc. In addition to seeing, some faults can also be repaired by hearing, smelling, touching and other auxiliary methods. For example: there are abnormal sounds, peculiar smells, trouble with tantalum capacitors, etc.
2. Voltage inspection method One of the important conditions for the normal operation of the circuit is that normal operating voltage is applied to the circuits at all levels, and if the operating voltage in the circuit is effective, it will not be able to operate normally and malfunction will occur. Therefore, many faults are related to whether the operating voltage is normal or not. The voltage checking method mainly uses a multimeter or transistor voltmeter to measure the power supply voltage, the voltage at all levels in the circuit, and the voltage of the emitter junction of the transistor in the circuit at all levels, collector-emitter The voltage between the electrodes and the voltage on the related resistor-capacitor components can be used to determine the operating status of the circuit and find the faulty tantalum capacitor.
3. Signal injection inspection method: In order to easily identify the faulty part when there is no signal, experienced maintenance personnel can stick their fingers to the metal part of the screwdriver and use the edge of a knife to touch all parts of the circuit except the ground or bypass ground. point, which is equivalent to injecting a jamming signal at that point. The interference method is used to detect faults. Generally, the final stage of the circuit injects interference signals into the forward stage several times.
