Hello; joined the club myself in the last week and thought I'd post something curious.
I noticed the game has a knocker but its never actuated. The manual shows the knocker, the knocker is coil 11 in the coil chart and self test menu and the wiring diagram shows knocker wiring, plug position etc.
When you receive a credit, the machine makes an electronic noise. So my first thought was there is a setting for the noise or knocker. Nope! So now my curiosity is really aroused. In the coil test menu, #11 fires nothing. I was going to get my meter out and test for a pulse at the coil but thought I'd merely ground the transistor at the solenoid board to fire the knocker.
As indicated by the manual, Q16 is for the knocker... and its not there. I'm assuming this was done deliberately by Bally to save a few pennies since the machine makes and electronic noise when a credit is one, so therefore it has been programmed to do so.
Anyone else notice this? For fun I'm going to add the missing driver to the board when I pull it for new caps and see if the knocker fires. cf5382988aa38a5a1b615617c0e579d5129fc9bd (resized).jpg