If pcba processing circuit boards are often used, failures will occur, so how do we need to repair these failures? Let's take a look at the maintenance principles of PCB circuit boards:
Analyze the maintenance methods of PCB circuit board manufacturers
1. Look first and then measure: The pcba processed circuit board to be repaired should first be visually inspected, and if necessary, it should be observed with the help of a magnifying glass.
2. Outside first and then inside: If the situation permits, it is better to have a good PCB circuit board as the board to be repaired as a reference, and then use the double-bang VI curve scanning function of the tester to compare the good and bad of the two boards. The initial comparison test point can start from the port of the PCB circuit board, and then from the table to the inside, especially the comparison test of the capacitor. This can make up for the shortcoming that it is difficult for the multimeter to detect the leakage of the capacitor online.
3. Easy first and difficult later: In order to improve the test effect, some technical processing should be done on the repaired board before the online function test of the PCB circuit board to minimize the impact of various interferences on the test process. The specific measures are as follows:
1) Preparation before test: For large-capacity electrolytic capacitors, solder a pin to make it open, because the charging and discharging of large-capacity capacitors will also bring interference.
2) Use the elimination 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 the test result of the device that has passed the test. If the test fails, you can test it again, if it still fails. The test result can be confirmed first.
I believe that after you understand the maintenance principles of PCB circuit boards, it will be more convenient to repair them in the future. This is a brief introduction to the above knowledge.
