As an integral part of the whole machine, a PCB generally cannot constitute an electronic product, and there must be an external connection problem. For example, electrical connections are required between PCBs, PCBs and external components, PCBs and equipment panels. It is one of the important contents of PCB design to choose the connection with the best coordination of reliability, manufacturability and economy. Today, we will discuss how to connect PCB connectors. In more complicated instruments and equipment, connector connections are often used. This “building block” structure not only ensures the quality of mass production of products, reduces the cost of the system, but also provides convenience for debugging and maintenance.
When the equipment fails, the maintenance personnel do not need to check the component level (that is, check the cause of the failure, and trace the source to the specific component.
This work takes a lot of time). As long as it is judged which board is abnormal, it can be replaced immediately, troubleshooting in the shortest time, shortening downtime, and improving equipment utilization. The replaced circuit board can be repaired within ample time and used as a spare part after repair.

1. Standard pin connection This method can be used for the external connection of the PCB, especially in small instruments. The two PCBs are connected through standard pins. The two PCBs are generally parallel or vertical, which is easy to achieve mass production.
2. PCB socket This method is to make a printed plug from the edge of the PCB. The plug part is designed according to the size of the socket, the number of contacts, the distance of the contacts, the position of the positioning hole, etc., to match the special PCB socket. When making the board, the plug part needs to be gold-plated to improve the wear resistance and reduce the contact resistance. This method is simple to assemble, has good interchangeability and maintenance performance, and is suitable for standardized mass production. The disadvantage is that the cost of PCB is increased, and the requirements for PCB manufacturing precision and process are higher; the reliability is slightly worse, and the contact is often poor due to the oxidation of the plug part or the aging of the socket reed. In order to improve the reliability of external connections, the same lead wire is often led out in parallel through the contacts on the same side or on both sides of the circuit board. The PCB socket connection method is often used for products with multi-board structure. There are two types of reed type and pin type for the socket and PCB or bottom plate.