Working on a Captain Fantastic. Mostly all working, but a few minor issues I could use help with. A buddy helped me yesterday to diagnose and resolve issues with 10 and 100 point relays locking on. All scoring is now working properly. Late yesterday I moved the pin to another room, and that required removing the head so had to pull the 3 Jones plugs in the backbox. Upon setup I notice the "Ball in Play" light wasn't working on the panel. Used the schematics to find the common pin for that on the Jones plug, and then cleaned all pins and receptacles on all 3 Jones plugs in the backbox - issue solved.

Remaining issues I haven't been able to solve using the schematics:

1 - Over the Top buzzer does not sound when 100,000 score is reached. I tested this on Player 1 and on Player 2. Both have the same problem, but on both players the 100,000 light on the back panel does come on when a score of 100,000 is reached. What might cause the buzzer to not sound even though the 100,000 display lamp comes on?

2 - The knocker works when it should work, but it is weak. Not the loud thwack it used to be. Plunger moves freely so I'm thinking not enough current is being delivered? Any thoughts on where to check for the cause?

Thanks for any advice you have to offer!

Using the schematic, how do I identify the switch on the score motor that is responsible for the knock? In other words, if I find the switch listed on the schematic, how can I identify what physical switch it is on the score motor? Yeah, a newbie question for sure.

Ok, I spent some time with the schematic and I'm catching on in terms of how to relate what is on the schematic to the physical components in the machine. Got both problems fixed. For the record, here is what I found:

1 - Over the Top buzzer does not sound when 100,000 score is reached. I cleaned the socket for the timing bulb by the Over the Top Relay and reinstalled the bulb. Bulb lights for about 2 seconds when 100,000 score is reached, so that is working properly. But no buzzer. Checked the buzzer by applying power directly to it, and it buzzes - so buzzer is functional. Cleaned the contacts on the Over the Top relay, all clean and working as expected, but still no buzzer. Jumpered in parallel with the red/white wire from the connection on the Over the Top relay directly to the buzzer - buzzer works when Over the Top relay is activated!! Metered for continuity on the red/white wire between the connection on the Over the Top relay and the male portion of the Jones plug - good continuity. Metered for continuity on the red/white wire between the male portion of the Jones plug and the female portion of the Jones plug - no continuity! Pulled that Jones plug, cleaned all the male pins with a wire wheel in a Dremel and cleaned the contacts in the female portion with a flexstone, reassembled and tested - buzzer now works properly!

2 - The knocker works when it should work, but it is weak. This was an improperly gapped contact pair on the credit unit. Closed up the gap a bit with a couple of adjust/test cycles until the knocker has a nice solid "thwack" sound.

Thanks Cash_Riprock for the help!