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Hikaru's diary on learning to solder Hikaru's diary on learning to solder
STORY 4: "How does the soldering iron work?"
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Mr. Fusamura : Now, let's start the repair.
Hikaru : First, I should remove the plastic insulation of the lead wire. (Photo 1) What do I do next?
Mr. Fusamura : You should suck up the solder from the motor terminal. Put the desoldering wire onto the terminal and press it with the soldering iron on the wire. (Photo 2) Be careful not to hold the soldering iron down for too long. Otherwise, the motor's plastic parts will melt.

Peel the lead wire coating. Peel the lead wire coating. Put the desoldering wire onto the terminal and press it with the soldering iron.
Photo 1 Photo 2

Hikaru : This makes me nervous. Am I doing it right?
Mr. Fusamura : You're doing a good job Hikaru
Hikaru : Thanks! Now, I'll wind the lead wire around the terminal (Photo 3) and solder the wire to the terminal (Photo 4). How is that?

Wind the lead wire around the terminal.
Photo 3
Solder the lead wire to the terminal.
Photo 4

Mr. Fusamura : I'm afraid there's a problem with this. Example of failure condition : Cold-Joint
Photo 5
Hikaru : What's wrong?
Mr. Fusamura : This type of soldering condition is called "Cold-Joint", an example of unacceptable soldering. (Photo 5) The surface is rough and has no brightness.


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