Solder is a metal alloy made from materials such as tin-lead or tin-lead-silver. It may also have rosin if it is rosin core. One popular use is to help form circuits on PC boards. The components are usually soldered to copper tracks or strips. It is sometimes necessary to desolder PC boards. This may be due to poor soldering joints that need to be replaced or to remove damaged components such as capacitors.
Desolder PC boards using a low-wattage soldering iron. This should be 30 watts or less. To remove the solder, use a desoldering pump.
Instructions
1 Select a component on the PC board. Place the tip of the soldering iron against the joint. Be careful not to touch the tip to the copper connections on the board.
2 Hold the pump against the other side of the joint. Depress the pump with the plunger or button and then turn the soldering iron on. As the solder melts, suck it up by releasing the plunger on the pump. Do not hold the iron against the joint too long; use it to remelt as needed.
3 Remove the component from the board when it is loose enough. Do this by lifting it up with your fingers, but do not yank it. You may need to use a tiny screwdriver or probe to loosen the leads.
4 Wipe excess solder away from the circuit board using a brush or probe. You may wish to purchase PC board cleaning solutions.
