Let's continue learning how to remove components from multi-layer PCB.
Removing components from multi-layer printed circuit boards: If you use the methods mentioned in the previous article (except for the solder flow soldering machine method), it will be difficult to remove and can easily cause connection failures between layers. Generally, the soldering pin method is used, which cuts the component off at the root of its pins, leaving the pins on the printed circuit board, and then the pins of the new component are soldered onto the pins left on the printed circuit board. However, this is not easy for multi-pin integrated components. The solder flow soldering machine (also known as the secondary soldering machine) can solve this problem and is currently the most advanced tool for removing integrated components from double and multi-layer printed circuit boards. However, the cost is relatively high. The solder flow soldering machine is essentially a special type of small wave soldering machine that uses a solder flow pump to extract molten solder that has not been oxidized from the solder pot, and then it emerges through a selectable specification of solder spraying nozzle, forming a local small wave peak, acting on the bottom of the printed circuit board. The solder on the pins of the components to be removed and the solder holes on the printed circuit board will melt immediately within 1-2 seconds, at which point the component can be easily removed. Then, use compressed air to blow through the solder holes of the component area, insert a new component, and then solder the finished product on the wave peak of the solder spraying nozzle.
In daily life, most of the household appliances we use are single-sided boards. Although various simple methods have their characteristics, it is recommended to use a solder sucker. For double and multi-layer boards, the simple methods mentioned above can be used, and it is better to use a solder flow soldering machine if conditions permit.
The above are the methods for removing components from multi-layer PCB. If you are interested in multi-layer PCB, you can contact our sales staff to place an order.
