Quoted from TXT11:Could anyone enlighten me as to exactly what an opto looks like? This is my first pin and the manual I got with my Kiss Pro is just a parts and service manual produced by Stern.
They look like this. There are 2 for each switch. One transmits light and one receives the light. When the ball passes between them, it breaks the been of light and the machine registers it.
These optos plug into a small board under the playfield. It could be the connector is loose to the board. As someone mentioned above, one of the wires may have fallen off at the opto and needs to be resoldered.
Minneapolis, MN
