Let's do some more soldering. We'll proceed
to LED soldering. An LED is a "light
emitting diode". It lights up like a
light bulb. Of course, the LED has fixed polarities
since it is a kind of diode. Look, you can
see a hole printed with an "A" above
it. A longer lead wire should be inserted
into this hole.
Photo 8
Hikaru
:
It is interesting that some components have
fixed polarities and others do not.
Next, we can solder the IC. (Photo 8)
Mr. Fusamura
:
Yes. Be careful
not to touch the soldering tip to the IC for
too long.
Hikaru
:
Sure. I position the soldering tip and feed
the solder. Position the soldering tip and
feed the solder.
OK, I've finished them all. Let's connect
the battery now.
Mr.
Fusamura
:
Just a moment. I'll check if the soldering
is complete.
Hikaru
:
Well? No, this isn't good enough.
Mr. Fusamura
:
What's wrong?
Not enough solder has been applied to this
part and another part. The through holes are
exposed. (Photo 9) Then, there is a bridge
between this IC lead wire and the adjacent
one. (Photo 10)
Photo 9
Photo 10
Hikaru
:
I see. What should I do in this case?
Mr. Fusamura
:
Heat up the
part with too little solder again and apply
additional solder to it. Be careful not to
add too much solder. As for the bridged parts,
suck up the solder with the desoldering wire.
