Analysis of the maintenance methods of PCBA circuit board manufacturers

If the PCBA processing circuit board is often used, there will be failures, so how do we need to repair these failures? Let's take a look at the maintenance principles of PCBA circuit boards together :

　　Analysis of the maintenance methods of PCBA circuit board manufacturers

　　First, look first and then measure: the PCBA processing circuit board to be repaired should first be visually inspected, and if necessary, it should be inspected with the help of a magnifying glass.

　　2. First outside and then inside: If the situation allows, it is best to have a good PCBA circuit board that is the same as the board to be repaired as a reference, and then use the dual-bang VI curve scanning function of the tester to perform a good and bad comparison test on the two boards. The initial comparison test point can start from the port of the PCBA circuit board, and then from the outside to the inside, especially for the comparison test of the capacitor. This can compensate for the shortcoming that it is difficult for the multimeter to measure whether the capacitor leaks or not.

　　3. Easy first and then difficult: In order to improve the test effect, some technical treatment should be done on the repaired board before the online function test of the PCBA circuit board to minimize the impact of various interferences on the test process. The detailed measures are as follows:

　　1. Preparation before the test: For large-capacity electrolytic capacitors, one foot should be soldered to make it open, because the charging and discharging of large-capacity capacitors will also cause interference.

　　2. Use the sweeping method to test the device: in the process of online test or comparison test of the device, please directly confirm the test result and record it for the device that has been tested. Test results can be confirmed first.

I believe that after everyone understands the maintenance principles 　　of PCBA circuit boards , it will be more convenient to maintain them in the future. The above knowledge is briefly introduced here.