After the circuit board design is completed, it needs to be output to the board factory for processing production, patching, and assembly.In the face of fierce competition in the market, the cost of PCB circuit board materials is also rising. More and more manufacturers are monopolizing the market at low prices in order to improve their core competitiveness. However, behind these ultra-low prices, they are obtained by reducing material costs and process manufacturing costs. However, devices are often prone to cracks (cracks), easy scratches (or scratches), and their comprehensive factors such as precision and performance have not reached the standard. , Which seriously affects the solderability and reliability of the product used.In the face of a variety of PCB circuit boards on the market, distinguishing the quality of the PCB circuit board can be started from two aspects; the first method is to judge from the appearance, and the other is to judge from the quality requirements of the PCB itself.The method to judge the quality of the PCB circuit board: First: distinguish the quality of the circuit board from the appearance. Generally, the appearance of the PCB circuit board can be analyzed and judged through three aspects; 1. Light and color. The external circuit board is covered with ink, and the circuit board can play the role of insulation. If the color of the board is not bright, and less ink is used, the insulation board itself is not good.2. Standard rules for size and thickness. The thickness of the circuit board is different from that of the standard circuit board. Customers can measure and check according to the thickness and specifications of their products.3. Weld appearance. Because the circuit board has many parts, if the welding is not good, the circuit board with the parts easy to fall off will seriously affect the welding quality of the circuit board, the appearance is good, and the interface is stronger, which is very important.Second: High-quality PCB circuit boards need to meet the following requirements 1. The copper surface is not easy to oxidize, which affects the installation speed. It will be damaged soon after oxidation;2. It is required that the phone be easy to use after the components are installed, that is, the electrical connection must meet the requirements;3.The copper skin is not easy to fall off under high temperature;4. The line width, thickness, and spacing of the line meet the requirements to prevent the line from heating, opening, and shorting;5.No additional electromagnetic radiation;6.High temperature, high humidity and special environment resistance should also be considered;7, the shape is not deformed, so as not to deform the shell after installation, the screw holes are misaligned. Now it is all mechanized installation, the hole position of the circuit board and the deformation error of the circuit and the design should be within the allowed range;8.The mechanical properties of the surface must meet the installation requirements;The above is the method of judging the quality of the PCB circuit board. When choosing a PCB circuit board, be careful.