Common Methods of Circuit Board Maintenance
1.Visual inspection method
By observing whether there is burnt place on the circuit board, whether there is a broken place in the copper, whether there is any smell on the circuit board, whether there is a bad soldering place, whether the interface or the gold finger is moldy and black.
2. Passing method
Test all the components until the faulty component is found and achieve the purpose of repair. If you encounter a component that cannot be detected by the instrument, replace it with a new one, and finally ensure that all the components on the board are good. The purpose of the repair. This method is simple and effective, but it is powerless for problems such as through holes, copper breakage, and improper adjustment of potentiometers.
3. Comparison method
Contrast method is one of the most commonly used methods for repairing circuit boards without drawings. Practice has proved that it has very good effect. By comparing the state of the good board with the purpose of detecting the fault, the abnormality is found by comparing the curves of the nodes of the two boards.
4. State method
The state method is to check the state of the normal operation of each component. If the state of a component does not match the normal state, the device or its affected component has a problem. The state method is the most accurate method for all maintenance methods. The operation difficulty is not as high as that of the average engineer. It requires a wealth of theoretical knowledge and practical experience.
5. Circuit circuit method
The circuit method is to create a circuit that can work after being mounted with an integrated circuit to verify the quality of the integrated circuit under test. The method can judge 100% accuracy, but the number of integrated circuits to be tested is numerous, the package is complicated, and it is difficult to set up a circuit for all integrated circuits.
6. Principle analysis (High Temperature PCB supplier china )
This method is to analyze the working principle of a board. Some boards, such as switching power supplies, can understand the working principle and details of the engineer without the need of drawings. For engineers, it is very simple to know the schematic diagram.