circuit board welding defects: 1. The weldability of circuit board holes affects the welding quality Circuit board hole weldability is not good, will produce virtual welding defects, affect the parameters of components in the circuit, lead to the multi-layer board components and inner line conduction instability, cause the whole circuit function failure. The so-called weldability [...]
There are many common welding defects on circuit boards, as shown in the figure below. The following is a detailed description of the common welding defects, appearance characteristics, hazards and causes. A, virtual welding 1. Appearance characteristics There is a clear black boundary between solder and component leads or copper foil, solder to the boundary [...]
After wave soldering and lead wave soldering, the defective circuit board pinhole and porosity are different, from the appearance, the diameter of the pinhole is small, now on the surface, you can see the bottom. Pinhole and the porosity represents in the solder joints have bubbles, but has not yet been expanding surface, most have [...]
Touch dimming circuit board is a touch switch, touch adjustment LED light size touch dimming circuit board solution. The induction mode of this circuit is light touch switch, there are two LED lights, light touch the first light for 1 light cold light, light touch the second light for 2 light warm light, touch the [...]
You know what? In PCB proofing, what are the components of a small circuit board? How is the circuit board maintained? 1. Circuit board composition Circuit board is mainly composed of welding pad, through hole, installation hole, wire, components, connector, filling, electrical boundary and so on. The main functions of each component are as follows: [...]
The main factor directly determining the quality and positioning of a board is the surface treatment process. Such as osp spray tin, gold, gold. Relative to sink gold is the face of high-end board. As a result of the quality of shen jin, relative to the cost is also relatively high. So many customers use [...]
PI refers to a polyimide resin material, which is now widely used in various fields, is a very good performance of the material, some people say that PI is a landmark material to promote the reform of electronic products. We mainly explain the position and function of FPC circuit board and PI. PI is a [...]
PCB substrate selection from the electrical performance, reliability, processing process requirements, economic indicators, etc. There are many substrates used for PCB, mainly including two categories: organic and inorganic. Organic substrates are made of reinforced materials such as glass fiber cloth impregnated with resin binder, then coated with Copper foil after drying, through high temperature and [...]
In PCB industry, there are many ion pollution tests for ion concentration, and more testing methods. There are many cleaning agents to clean residual ions. With the rapid development of the electronic industry, the integration of electronic products is getting higher and higher, the density of components on the circuit board is getting higher and [...]
The circuit graphics on PCB board are completed by PCB manufacturers using exposure imaging and development etching technology. Both PCB multi-layer board and flexible circuit board need exposure imaging and development technology when making circuit graphics. The following is a detailed introduction of the processing characteristics and principles of the two processes. (1) exposure. Due [...]