Ok, I'll probably get scolded here as I actually have similar issues on two separate machines (and yes, different manufactures) so I may need to split these up to get the correct answers, but the issues are so similar, hoping possibly same fix?
1976 Bally Hang Glider
1976 Williams Space Mission
For some reason, both play great in single player mode. But when I hit the credit button again for multi-player, they both add players - buttt:
Hang Glider - Plays Ball # 1 for each player, but then sticks on Ball # 1 for player # 4 - never advancing after that.
Space Mission - Once I hit the credit button for more players, it stays on Ball # 1, Player # 1..never advancing after that.
Are these similar issues, or different fixes?
Is it the ball count unit, or the player unit? Thinking just a cleaning on the contacts?
Any & all help is appreciated, thanks !