Precautions for maintenance of PCBA circuit board manufacturers

PCB manufacturers, PCB designers and PCBA manufacturers explain the maintenance precautions of PCBA PCB manufacturers

If the PCBA circuit board is often used, it will also have faults. How do we repair these faults? Let's learn about the maintenance principles of PCBA circuit board:

Maintenance methods of PCBA circuit board manufacturers

1、 First look, then measure: the PCBA circuit board to be repaired shall be visually inspected first, and with the aid of a magnifying glass when necessary.

2、 Outside before inside: If the situation allows, it is better to have a good PCBA circuit board as the same as the board to be repaired as a reference, and then use the dual port VI curve scanning function of the tester to perform a good and bad comparison test on the two boards. The first comparison test point can start from the port of the PCBA circuit board, and then from the table to the inside, especially for the capacitor. This can make up for the defect that the multimeter is diffICult to detect whether the capacitance is leaking on line.

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

1. Preparation before test: For electrolytic capacitors with large capacity, the next leg should also be welded to open circuit, because the charging and discharging of large capacity capacitors will also cause interference.

2. 
   

2. Use the exclusion method to test the device: During the online test or comparative test of the device, please directly confirm the test results of all devices that pass the test and record them. For those that fail the test, you can test again. If they still fail, you can confirm the test results first.

I believe that after you understand the maintenance principles of PCBA circuit boards, it will be more convenient for you to repair them in the future. This is a brief introduction to the above knowLEDge.

PCB manufacturers, PCB designers and PCBA processors will explain the maintenance precautions of PCBA PCB manufacturers.