Page 100 - Electronic Mechanic - TP - Volume - 2

ELECTRONICS MECHANIC - CITS

7 Soldering a connection should take just a few seconds.
8 Inspect the joint closely. It should look shiny.
• If you are soldering a wire (called the lead) onto a PC board (on the track), it should have a volcano shape.
• If the connection looks bad, reheat it and try again.

Desoldering Basics
Materials Needed for Desoldering
a Solder Sucker/ Desoldering Pump

The most commonly used and convenient equipment needed for desoldering is the desoldering pump. A good
manual solder sucker like this one works pretty well for selectively removing through holes parts from a PCB.
Cheaper and smaller units do not work as well. They’re marketed as compact but they don’t works as well due to
the limited stroke length and smaller cylinders.
Desoldering Process
One of the nicest ways to desolder a component involves using a desoldering pump. A desoldering pump is
essentially a small, high pressure vacuum. After heating up the solder, you can use the desoldering pump to suck
the solder up and out of the way. Here are the basic steps for using a hand-powered desoldering pump. 1. Heat
up the solder you want to remove with a soldering iron (some desoldering pumps also come with attached irons).
2 Press down on the plunger (If your pump has a bulb, just squeeze the bulb).
3 Once the solder is molten, place the tip of the desoldering pump against the solder that you want to remove.
soldering iron use:- A soldering iron is a hand tool used in soldering. A quality soldering iron is one of the most
important tools you’ll need in almost every soldering projects. It supplies heat to melt Solder which acts as a sort
of metallic glue that joins elements together. Soldering irons have many applications. It is very helpful for repairing
small holes in metal items, use by jewellers, metal workers, roofers and electronics technicians.

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CITS : E & H - Electronics Mechanic - Exercise 141