To start, focus on the zero position switch on the credit unit. Make sure the unit is greater than “0” and that switch is closed. Then focus on switches on the “y” and “s” relays.
If all is right, pressing the coin door button will energize the “y” relay. The “y” relay has a switch that will energize the “s” relay. The “s” relay has a switch that will start the score motor.
Clean and adjust all the switches in this post. Credit unit and “y” and “s” relay switches