Essential procedures for desoldering a circuit board
Desoldering usually involves two key processes. Understanding these processes is key to grasping all the procedures involved in desoldering. One method utilizes a desoldering pump, just as explained above, while the second method employs a blast of hot air combined with a vacuum pump. In the latter method, the hot air blast is used to melt the solder away. The molten solder is then sucked by a vacuum pump, or if the bits are large enough, a pair of tweezers can also be used to collect the bits.
So, what are the essential procedures for desoldering, regardless of the method used? We learn that next- just hang in.
1) Choose a good soldering rod
If you are using a desolder pump that has inbuilt ironing heads, you may not need to select the soldering iron- it’s already installed. The only thing you can do here is to ensure you buy a pump that has good soldering iron.
If you have to use a soldering iron separately, you must go for a high-quality one that has a temperature display. Ensure the cable is also flexible to accommodate movements, and finally, check if the tip is clear and clean. This way, the iron will remain conductive throughout the process.
High-quality soldering irons will cost more and last longer. It’s certainly the way to go.
2) Get a suitable holder for the PCB
You’ll want to ensure that your board is properly secured before you can begin work. For that, go for a good-quality holder, or build one that is sufficient for that need. Either way, ensure the grip is firm to stop any movements but not too tight as to crush the board.
3) Use sufficient solder
Molten solder aids at removing any desoldered components rather easily. More solder would ideally be good for removing components because the large molten spool can stay at higher temperatures long, thus remaining molted. However, the large molten spool takes longer to solidify and may not be the best for closely packed connections. You should thus choose the amount of solder depending on the task at hand.
4) Solder quickly
Lead vapors are not the best thing to inhale. You should work as fast as you can to minimize the exposure, but remember that speed is dependent on your experience and expertise.
5) Detach the circuit board
Some boards are usually connected to heat sinks for heat dissipation. This makes it harder to melt the solder as the heat keeps on getting conducted away. For easy, you should consider detaching the board before you can work on it.