Find the fault detecting PCB a short time
Making PCB is not just make the board according to the process, or drill a hole to assembling the components. PCB production is not difficult, the difficulty part is troubleshooting after the completion of production. Whether it's an individual enthusiast or an industry engineer, it's also a headache when debugging PCB, just like a programmer encounters bug. Some people have a intense interest in debugging PCB, just as programmers are solving bug, there are many common PCB problems, except for board design, damage of electronic components, circuit short circuit, quality of components, and disconnection fault of PCB.
The most common PCB circuit board fault concentrating on the components, such as capacitors, resistors, inductors, diodes, triodes, field-effect transistors, etc. The obvious damage of integrated chip and crystal oscillator can be observed by eyes. There are obvious burn marks on the surface of electronic components with obvious damage. Such faults can be solved by directly replacing the faulty components with new ones.
Of course, not all the damage of electronic components can be observed by the naked eye, such as the resistance, capacitance, diode and triode mentioned above. In some cases, the damage cannot be seen from the surface. It needs to be repaired with the help of professional inspection tools. The commonly used inspection methods include: multimeter, capacitance meter, etc. when detecting that the voltage or current of an electronic component is not normal Within the scope, it indicates that there is a problem with this component or the previous component. Replace it directly and check whether it is normal.
If the components are broken, they can be detected no matter by eyes or by instruments. But sometimes when we put the components on the PCB, we will encounter the situation that they can't be detected, but the PCB can't work normally. Many novices have no choice but to make a new board or buy one. In fact, in many cases, during the installation of components, due to the coordination of various components, the performance may be unstable.
In this case, the instrument is no longer help. You can try to judging fault according to current and voltage, and try to reduce it as much as possible. Experienced engineers may be able to quickly judge the fault area, but the specific components which are broken can not be determined 100%. The only way to do this is to try to replace the suspect component until the faulty component is found.
All of the above are the problems of electronic components. Of course, since PCB is the partner of components, then the circuit board fault cannot be avoided. The simplest example is the planting Tin part. Due to the manufacturing process, In the process of PCB corrosion, there may be line broken .If it can't be repair, it can only be solved with thin copper wire.
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