I have two Square Head machines; one working, one won't start. I figured I could use the working one for comparison of switch positions, but that hasn't worked for me. Score motor and relay switch positions appear identical between machines, but apparently they are not. Also some are buried and hard to see so I'm not sure if they are the same.
The score motor runs nonstop when I push the added-on door switch button. The S relay kicks on and the R (hold) relay locks on. That's it. The score reels and ball count unit don't try to reset. T and D (tilt and reset) units don't activate. The 20 bank relay unit does not try to reset.
IF i manually move the ball count unit to 5 balls the score motor stops running and the game plays - flippers, bumpers, all scoring/score reels works properly. But if a free ball should be earned by 1,000 points or going down a lit side alley or gobble hole, the ball count unit does not add a ball. When the ball drains a ball is not subtracted.
The 9th position and 0 switches open and close properly in the score reels. Setting the ball count unit to 0 balls opens its zero switch.
The tilt switch under the playfield had been rigged always open by a previous owner. I don't think that's a problem since it's locked open and should be open anyway. I'll put that back to original later.
I've checked the white-blue-red wire from motor switch 2C to the D relay and B relay and the solder connections are solid.
I have a very limited ability to read schematics and am a bit hazy on how to jumper connections, so please keep that in mind if you have suggestions. I'll include the bottom part of the schematics. I've looked in all forum posts for all 1963 Gottlieb games and couldn't find a post addressing the problem. Let me know what other information or pictures are needed - I'm stuck home now like everybody else an have lots of lots of free time!