Power connection
You need to extend the wires of the power connector by about 20cm.
To do so take some stranded wire with different colors, strip and solder
to the power connector wires. Use shrinking tube to cover the joints.
Then guide the wires under the keyboard to the power supply board.
Then solder the wires to the power supply board.
The yellow wire gets soldered to the -14V terminal, the black wire to the
ground (GND) terminal and the red wire to the +14V terminal.
