In the PCB assembly and soldering process, SMT chip processing manufacturers have many employees or customers involved in operations, such as plug-in insertion, ICT testing, PCB splitting, manual PCB soldering operations, screw mounting, rivet mounting, crimp connector manual pressing, PCB cycling, etc., the most common operation is one person picking up the board with one hand, which is a major factor in the failure of BGA and chip capacitors. So why does this cause a malfunction? Let our editor explain it to you today!
The hazards of holding the PCB board with one hand:
(1) Holding the PCB board with one hand is generally allowed for those circuit boards with small size, light weight, no BGA and no chip capacity; but for those circuits with large size, heavy weight, BGA and chip capacitors on the side boards, which should definitely be avoided. Because this kind of behavior can easily cause the solder joints of BGA, chip capacitance and even chip resistance to fail. Therefore, in the process document, the requirements for how to take the circuit board should be indicated.
The easiest part of holding a PCB with one hand is the circuit board cycle process. Whether removing a board from a conveyor belt or placing a board, most people unconsciously adopt the practice of holding the PCB with one hand because it is the most convenient. When hand soldering, paste the radiator and install the screws. To complete an operation, you will naturally use one hand to operate other work items on the board. These seemingly normal operations often hide huge quality risks.
(2) Install screws. In many SMT chip processing factories, in order to save costs, tooling is omitted. When screws are installed on the PCBA, the components on the back of the PCBA are often deformed due to the unevenness, and it is easy to crack the stress-sensitive solder joints.
(3) Inserting through-hole components
Through-hole components, especially transformers with thick leads, are often difficult to accurately insert into the mounting holes due to the large position tolerance of the leads. Operators will not try to find a way to be accurate, usually using a rigid press-in operation, which will cause bending and deformation of the PCB board, and will also cause damage to the surrounding chip capacitors, resistors, and BGA.