Follow this tutorial to know how to connect the photocells on a CA2B9 electronic board
If you connect a photocell while it is powered up, remember to restart it electrically once the terminal block has been repositioned on the board.
Disconnect the transformer for 30 seconds and then reconnect it.
When the card is switched on, it will light up all its red lights and then switch them off if the photocells are correctly recognized.
