Methods to judge the quality of FPC circuit board:
1： Distinguish the quality of the circuit board from the appearance
Generally, the appearance of FPC circuit board can be analyzed and judged from three aspects;
1. Standard rules for size and thickness.
The thickness of circuit board is different from that of standard circuit board. Customers can measure and check according to the thickness and specification of their products.
2. Light and color.
The external circuit board is covered with ink. The circuit board can play the role of insulation. If the color of the board is not bright and less ink is needed, the insulation board itself is not good.
3. Weld appearance.
Due to the large number of parts of the circuit board, if the welding is not good, the circuit board whose parts are easy to fall off will seriously affect the welding quality of the circuit board. Good appearance, careful identification and strong interface are often important.
2： High quality FPC circuit board needs to meet the following requirements
1. It is required that the telephone should be easy to use after the components are installed, that is, the electrical connection should meet the requirements;
2. The line width, line thickness and line distance of the line meet the requirements to avoid heating, open circuit and short circuit of the line;
3. The copper skin is not easy to fall off under high temperature;
4. The copper surface is not easy to oxidize, which affects the installation speed. It will be broken soon after oxidation;
5. No additional electromagnetic radiation;
6. The appearance is not deformed, so as to avoid deformation of the shell and dislocation of screw holes after installation. Now it is mechanized installation, and the hole position of the circuit board and the deformation error between the circuit and the design should be within the allowable range;
7. High temperature, high humidity and special resistance should also be considered;
8. The mechanical properties of the surface shall meet the installation requirements.
