Surface mounted devices (SMDs) are electronic components that are soldered to the PCB surface by their miniscule metallic surface
terminals. Common examples of SMDs are passive parts such as resistors are
capacitors, or active parts such as ICs.
Through-hole components have leads that are inserted through padded holes and are then soldered to the pads
on the bottom side of the PCB. Common examples of through-hole components are
resistors, capacitors Cheap Raptors Jerseys , relays, inductors, transformers and more.
To remove SMDs and through-hole components from a PCB, use the following
procedure:
Preparation
1. Don personnel protective equipment (PPE) such as safety glasses and gloves.
2. Set the PCB on a work surface that is both horizontal and dry. It is important that the PCB is set on a truly
horizontal surface; when the PCB is heated, molten solder will be created and
may move to adjacent pads or tracing when set on a non-horizontal
surface Vince Carter Raptors Jersey , which may cause short circuits on the PCB.
Removing SMDs
3. Use a heat gun to remove the SMDs. After turning on the heat gun, position it approximately 15 centimeters above the PCB
with its nozzle pointed down. In short order, the heat will melt the solder flux
of the SMDs that are beneath the nozzle of the heat gun. Quickly remove these
components by utilizing a tweezers. Collect them in a tray. Repeat this
procedure until all the SMDs are removed from the top side of the PCB.
4. After you have removed all the SMDs, allow the PCB to cool for up to three
minutes. Power down the heat gun and properly stow it away in a safe place.
Removing Through-Hole Components
5. Energize a soldering iron and sets its temperature to 450oC. Obtain a 6-inch length of copper desoldering
braid.
6. Select a desoldering starting point at the far edge of the board. Then touch the copper braid on top of a pad that as you place the tip of
the soldering iron on the solder joint pad. In a matter of seconds, the solder
flux should melt and flow into the copper braid. Follow this procedure for all
pads.
7. After you have completed desoldering on the pads on the reverse side of the board Tracy Mcgrady Raptors Jersey , flip the PCB over and repeat the process again using both the heat gun and the soldering iron to remove any other
components and residual solder.
8. When all SMD and through-hole components are removed, de-energize the soldering iron and properly secure it in
a safe location.
Clean Up
9. Inspect the PCB and using swabs doused in alcohol, clean the pads on both sides of the PCB. After you have
cleaned the pads, you should have removed all the components from the PCB.
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