Resistance welding flux is printed on PCB components before they are coated on plates. Its main function is to prevent "wiring" and short circuit during wave soldering and protect the PCB permanently. In addition, printing plants can also save solder, reduce the weight of printed circuit boards, reduce costs. The soldering flux has the following [...]
In the electronic product processing industry, the circuit board has three branches: hard and soft. The traditional circuit board is generally rigid circuit board, while flexible circuit board is a kind of printed circuit board with special functions, which is mainly used in mobile phone, notebook computer, PDA, digital camera, liquid crystal display and other [...]
Using X - ray can effectively detect the defects of PCB, such as soldering, adhesion, copper foil falling off. In order to meet the needs of our customers, UFJ has introduced a new X-ray examination system with high capacity, high resolution and high magnification. In BGA, CSP, flip chip inspection, semiconductor, package components, electronic connector [...]
Photo taken on Dec. 2, 2018 shows the International Electronic Circuits (Shenzhen) Exhibition 2020, with the theme of "5G Era and Smart Future", at the Shenzhen Convention and Exhibition Center in southern China's Guangdong Province. Joinly organised by the Hong Kong Circuit Board Association and the China Electronic Circuit Industry Association, the exhibition covers an [...]
PCB circuit boards, chip bracket, power supply circuit chips in our life, although not often meet directly, but generally exists in every aspect of our daily life, from chips, memory, power supply, switch machine, server, scientific instruments, such as special products to mobile phones, computers, televisions, air conditioners, refrigerators and other household appliances, literally open [...]
Principle of sound-light control delay switch circuit board: Acousto-optic control delay switch is mainly composed of sound control switch, light control switch and delay circuit. Voice control is to collect sound through the pole microphone, and generate pulse signal. The light-controlled circuit is controlled by photosensitive resistors. The resistance value of photosensitive resistors varies greatly [...]
The production process of circuit board is more complex, which involves a wide range of processes, from simple mechanical processing to complex mechanical processing, common chemical reaction, photochemistry, electrochemical thermochemistry and other processes, computer-aided design CAM and other knowledge. And in the process of production process problems and will always meet new problems and some [...]
As the PCB line production of fine line open circuit in the making problem become the important factor of affecting the product percent of pass, usually for line qualification rate of improvement action will consider the dry film adhesion, factors such as exposure energy, from the point of view of the whole system production, flatness [...]
Types of FPC reinforcement, we usually only use three types of reinforcement. PI polyimide, FR4 and steel sheet. 1. PI reinforcement: tolerance can be controlled in +/ -0.03mm, high precision, high temperature resistance (130-280 degrees Celsius) 2. Steel sheet reinforcement: manual assembly is required, the process is more complex and the cost will be higher. [...]
Testing whether the IC is burned out or short circuit requires professional knowledge. Generally, people without such knowledge and skills can make some simple judgments by carefully observing the appearance of IC: whether the IC surface has burned marks, such as blobs, cracks, discoloration and so on. IC pin break, unsolder. Does IC have burnt [...]