Preparamos la pista sensor multicarril para soldar los cables de alimentación.
We will now prepare the track for the power supply cable soldering.

Fíjate que has colocado correctamente la pista en el sentido de giro original.
Take a look into the track position in order to be sure that is the same position that it was
originally.
Soldamos los cables de alimentación manteniendo la polaridad de los mismos.
Weld the power supply cables taking care about the polarity.