_____________________________________________________ ________
28
Mastering the Art of Soldering
10. Lifted Pad
This frequently happens when attempting to desolder the components from the circuit board.
Oftentimes, it can be caused by overworking the joint causing the adhesive bond on the
board is ruined.
How to Repair:
For the example above, you can solder the lifted pad to the leg of the
nearest component. For other cases, fold the lead over towards a copper trace and solder. If
the board has a solder-mask, carefully scrape off enough to expose the bare copper.
11. Stray Solder Spatters
Bits of solder can often cause a short circuit on the board. They are there because of the
sticky flux used.
How to Repair:
Remove the bits of solder using the tip of the knife or tweezers
Problems encountered when soldering can be repaired with patience, here are the tips
that you will bear in mind if soldering goes wrong:
1. Do not panic, relax and take as much time as necessary.
2. Stop what you are doing and let the joint cool.
3. Clean the soldering iron and its tip with the appropriate cleaning materials (brass
wire, sponge)
4. Get rid of any burn flux from the joint.
5. Prepare the soldering iron by letting it heat up to desired temperature.
6. Reheat the joint and try again
4.7. Soldering Surface Mount Technology (SMT) Components
From the previous topic, we’ve introduced to you soldering through-hole components. We’ve
shown you guides on how to solder through-hole components including what to prepare
before the process and what the finish product would look like. In this chapter, we’ll discuss
what surface mount technology is and how to solder surface mount parts onto the surface of
PCB.
4.7.1 Surface-Mount Technology
Surface-mount technology is the process when you build your electronic circuits by mounting
electronic components directly onto the surface of printed circuit boards or PCB. This is
different from the previous method discussed wherein components are mounted onto the
holes of the circuit board.
