We know that in the process of assembling and soldering PCB circuit boards, it is inevitable that there will be manual participation, such as plug-in component insertion, ICT testing, PCB sub-boarding, manual soldering, mounting screws/rivets, and manual press-in connectors And PCBA circulation, etc., during this series of operations, one of the most common actions is to hold the circuit board with one hand. Today, Sanjing mainly takes you to understand the impact of holding the PCB with one hand on the circuit board. I hope it can be helpful to everyone!

Under normal circumstances, it is allowed to hold the PCB board with one hand for small size, light weight, no BGA and chip capacitors, but for large size, heavy weight, and BGA and chip capacitors on the side of the circuit board, Should try to avoid holding the circuit board with one hand, because this will easily cause the solder joints of BGA, chip capacitors and resistors to fail.

Generally, transformers with relatively thick leads are often difficult to accurately insert into the mounting hole due to the relatively large lead position tolerance, and some manual operations generally use one-handed force to insert the mounting hole, which can easily cause the PCB board to bend and deform. At the same time, it is easy to damage the surrounding chip capacitors, resistors and BGA.

In order to save costs, many SMT chip processing factories have omitted the step of tooling, and the PCB board is often deformed due to the unevenness of the components on the back of the PCBA. Once the PCB board is deformed, it is easy to make some sensitive to stress. The solder joints formed a crack.

However, the easiest link to hold the circuit board with one hand is the circuit board circulation process. Why do you say that, because most people will unconsciously use the method of holding the circuit board with one hand, regardless of whether it is taking the board from the belt line or placing the board. After all, according to human behavior and operating habits, this is more convenient. When manually welding, attaching heat sinks, and installing screws, due to the completion of an operation, the circuit board is generally held in one hand and other work items are operated in the other. This seemingly normal operation often involves great quality risks.

For the circuit board, as long as there is a problem with one of its parts, it will affect the normal operation of the entire board. Therefore, it is extremely necessary for us to follow the instructions of the relevant process documents in our daily production and processing, so that it is possible to avoid some unnecessary troubles.