Teach you how to judge the quality of the circuit board

With the rapid development of the mobile phone, electronics, and communication industries, it also promotes the continuous growth and rapid growth of the PCB circuit board industry. People have more and more requirements for the number of layers, weight, precision, materials, colors, and reliability of components. Higher. However, due to fierce market price competition, the cost of PCB board materials is also on a rising trend, and more and more manufacturers are monopolizing the market with low prices in order to enhance their core competitiveness. However, behind these ultra-low prices are obtained by reducing material costs and process manufacturing costs, but devices are usually prone to cracks (cracks), scratches, (or scratches), and their precision, performance and other comprehensive factors have not reached the standard. , Which seriously affects the solderability and reliability of the product. Faced with a wide variety of PCB circuit boards on the market, there are two ways to distinguish the quality of PCB circuit boards; the first method is to judge from the appearance, and the other is to judge from the quality specification requirements of the PCB board itself. The method to judge the quality of PCB circuit board: First: distinguish the quality of the circuit board from the appearance (under normal circumstances, the appearance of the PCB circuit board can be analyzed and judged through three aspects; 1. The standard rule line of size and thickness The thickness of the board to the standard circuit board is different. Customers can measure and check the thickness and specifications of their own products. 2. Light and color The external circuit board is covered with ink, and the circuit board can play a role in insulation. If the color of the board It is not bright, less ink, and the insulation board itself is not good. 3. The appearance of the welded seam The circuit board has many parts, if the welding is not good, the parts are easy to fall off the circuit board, which seriously affects the welding quality of the circuit board and has a good appearance. It is very important to identify carefully and a stronger interface. Second: A high-quality PCB circuit board needs to meet the following requirements: 1. After the components are installed, the phone must be easy to use, that is, the electrical connection must meet the requirements; 2. The line of the line The width, line thickness, and line spacing meet the requirements to avoid line heating, open circuit, and short circuit; 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, and it will be broken soon after oxidation; 5 There is no additional electromagnetic radiation; 6. The shape is not deformed, so as to avoid the deformation of the housing after installation, and the screw holes are dislocated. Now it is mechanized installation. The hole position of the circuit board and the deformation error of the circuit and the design should be within the allowable range; 7 , And high temperature, high humidity and special environment resistance should also be considered; 8. The mechanical properties of the surface should meet the installation requirements;