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3.) Soldering CTR-30C circuit board, referred to as Board C
a.) Soldering 1 DC socket (matching the shape of the board)
b.) After the DC socket is soldered, the pins need to be cut as short as possible to prevent affecting the
installation of the battery box behind. (Reinforce the DC socket with the cut component pins) in a "U"
shape if you plan on using it instead of batteries.
c.) Soldering 1 key switch with the notch facing out. If you cannot find the notch, click the push button to
make the switch pop up.
Switch notch outward
5
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