Once you know how to solder, you are sooner or later going to need to know how to desolder (more likely sooner than later). Desoldering helps you undo all of those terrible soul-crushing soldering mistakes.
Desoldering becomes an important skill to possess, because you will need to be able to do it to remove the servo controller boards. Removing these boards is necessary in order to build most of the bots.
Fortunately, this is an easy skill to learn!
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Go get some desoldering braid and unwind a few inches from the packaging.
Place the exposed desoldering braid over the solder joint on the circuit board that you want to desolder.
Press down on top of the desoldering braid with your soldering iron until you see and/or feel the solder beneath the braid start to liquify and flow.
Place the exposed desoldering braid over the solder joint on the circuit board that you want to desolder.
Press down on top of the desoldering braid with your soldering iron until you see and/or feel the solder beneath the braid start to liquify and flow.
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-1st: Hold the board with the pieces to desolder with a object like this (I do not know it's name in english) http://tinyurl.com/cw2kgzm with the piece to desolder upwards.
-2nd: apply the hot air jet to the solder joint
-3rd after 15 to 40 seconds, the soder joint has been liquidify and with a pliers pull of the piece you want to recycle.
This technique is really useful for industrial soldered parts with this leadfree soder material, and for boards with SMD components.
Hope is a clear explanation!