I am in the process of diagnosing and troubleshooting a 1954 United's Deluxe Mercury shuffle alley bowling machine. All the info below was in another thread but I have transferred it to its own thread so it may be of help tsomeone at a later date.
Just picked the machine up a few weeks ago and its currently not functioning. Looking for a schematic so I can start delving into it and bring it back to life. Currently it powers on and if I drop a dime in it starts the process and is in game mode however, none of the rollover switches register. Wmsfan suggested to double check the jones plugs between the alley and head. Make sure its a good connection and maybe clean the plugs a bit as well. I did clean the contacts of all connectors and reseated them as well with no change. Next per his advice I tried pushing a few of them from the underside of the alley to see if the gap was too large in the switches to make contact with no change. Mopar added this to try, if the Game Over Relay is resetting (which I now believe it is), and the Pin Relays
aren't energizing through the rollovers, I believe on your machine there's a set of switches in both the
Game Over Relay, and in the 1st Shot Relay that should be closed when those two relays are in the
reset position. Not any of the rollovers will activate any of the Pin Relays (in the Relay Bank) if either
of those switches aren't making true contact.
Mopar was spot on right. When you power the game on the arm comes down resets all the switches. When you drop a dime in the slot only the game over coil trips and opens. If you try to close it manually the coil just starts buzzing trying to close.
Also not sure this wiring is right it looks a bit sketchy to me. Also check out the right lug of the 2nd shot coil and both lugs of the game over coil they look pretty dark. Do these look like anything I should be concerned with?
Mopar added this advice..Yes, that jumper does look sketchy, but I wouldn't be concerned with it at this point.
We at least know the Game Over Relay energizes..
After start up, I'm thinking the Lock Relay isn't remaining energized. If not, that would point to a Slam
Switch or burned out Lock Relay coil..
This is now the point at which I am at so any more points or tips would be greatly appreciated.