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Look first and then test: The repaired PCB circuit board should be visually inspected first, and if necessary, use a magnifying glass to observe..
2. From the outside to the inside: If the situation permits, it is best to have a good PCB circuit board as a reference, and then use the double vi curve scanning function of the tester to test the two boards. The starting point of the comparison test can start from the port of the PCB circuit board, and then from the instrument and the inside, especially the capacitor. Equipment comparison test. This can make up for the defect that it is difficult to measure the leakage of capacitance on the multimeter online.
3. Easy first and difficult later: In order to improve the test effect, some technical processing should be carried out on the repaired PCB before the online function test, so as to minimize the impact of various interferences on the test process. The specific measures are as follows:
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.
Exclusion method is used to test devices: During the online test or comparison test of devices, all devices that pass the test should directly confirm the test results and record them. If the test fails, the test result can be tested again, if it fails, the test result can be confirmed first.
As for the maintenance principle of PCB circuit board, I believe that after you understand it, it will be more convenient to maintain in the future. I will give you a brief introduction to the above knowledge.
