Points needing attention in PCB template testing

PCB is also called “PCB Printed Circuit Board”. PCB can be divided into single-sided, double-sided and multi-layered boards according to the hierarchy. It has the characteristics of high density, good security, thin thickness and good flexibility, and is widely used in the fields of communication, automotive electronics, consumer electronics, aerospace and so on. The manufacturing quality of PCB not only directly affects the reliability of electronic products, but also affects the integrity of signals transmitted between chips.
With the rapid development of electronics, communications, aerospace and aviation, the demand for PCB boards is constantly increasing. Many manufacturers monopolize the market with low prices in order to enhance their core competitiveness. However, behind the low prices, they choose to reduce the cost of materials and technology, which leads to mixed PCB boards on the market. Facing the defective PCB printed circuit boards on the market, we can distinguish them from the appearance of PCB boards and the quality of PCB boards themselves. In appearance discrimination, we can observe PCB thickness, welding appearance, light and color, etc.
PCB is the key electronic interconnection of electronic products and the substrate on which all electronic parts are loaded. All electronic equipment can’t be separated from PCB, so a high-quality PCB should have the characteristics that the copper skin can’t fall off easily under high temperature. The line width, line thickness and line spacing of PCB lines meet the requirements; The electrical connection of PCB should meet the requirements, the shape of PCB should not be deformed, and it should also have high temperature, high humidity and special environment resistance.
The welding quality of PCB components directly affects the performance of products. Therefore, the quality inspection and testing of PCB is a necessary link in the quality control of PCB manufacturers. Pay attention to the following points when testing PCB:
1. Insulation performance of electric soldering iron: Do not use electric soldering iron for welding. Make sure that the soldering iron is not charged.
2. Don’t cause short circuit between pins: When measuring voltage or testing waveform with oscilloscope probe, don’t cause short circuit between pins of integrated circuit due to sliding of probe or probe.
3. Pay attention to the heat dissipation of the power integrated circuit: do not work when the radiator is in a high power state.
4. Reasonable detection of PCB leads: If it is necessary to add peripheral components to replace the damaged parts inside the integrated circuit, small components should be selected, and the wiring should be reasonable to avoid unnecessary parasitic coupling.
5. Guarantee the welding quality: carefully check the welded integrated circuits, and then turn on the power supply after confirming that there is no solder adhesion.
The demand for terminal electronic products to be thin, short and multifunctional has changed, which has prompted the rapid improvement of product performance and integration of electronic components, which also puts forward higher and finer requirements for PCB processing and materials.