In SMT surface mount processing, PCB board pre-processing inspection includes appearance, solder pad pins, component silk screen inspection, cleanliness and anti-static treatment, and advanced testing technology.
1、 Preliminary appearance inspection
Firstly, conduct a preliminary visual inspection of the PCB board, including whether the surface is flat, and whether there is any obvious deformation or damage. Pay special attention to surface defects such as scratches, cracks, and oxidation, which may affect circuit performance.
2、 Pad and pin inspection
Next, carefully inspect whether the solder pad coating is uniform and whether there is corrosion, oxidation, or other damage. At the same time, check the quality of pin soldering to ensure that there are no issues such as virtual soldering, cold soldering, or excessive soldering. This step is an important indicator for evaluating the reliability of PCB boards.
3、 Component and silk screen inspection
Then, check if the position, orientation, and welding of all components are correct. Pay special attention to whether there are any issues such as misalignment, inversion, solder leakage, or short circuit in the components. At the same time, check whether the silk screen markings are clear and readable, without blurring or missing, to ensure compliance with design requirements.
4、 Cleanliness and anti-static treatment
In the pre-processing stage, it is also necessary to check the cleanliness of the PCB board to ensure that the surface is free of impurities such as dust and oil stains. At the same time, necessary anti-static measures should be taken to avoid damage to sensitive components caused by static electricity. This step is an important part of improving the overall quality of the PCB board.
5、 Application of advanced detection technology
Finally, advanced testing techniques such as High Acceleration Life Test (HALT) and High Acceleration Stress Screening (HASS) can be used to conduct a more comprehensive inspection and evaluation of PCB boards. These technologies help identify potential design, process, and material issues, thereby enhancing product reliability.
The pre-processing inspection of PCB boards involves multiple key steps, each of which requires strict supervision. By mastering and executing these steps, we can ensure that the quality of the PCB board meets the design requirements and production standards, laying a solid foundation for subsequent SMT surface mount processing.
