I'm trying to repair my first pachinko machine. When a ball goes into one of the bottom three catchers it starts playing a tune and the arms open in the middle to catch balls which then causes a digital counter to go up by one.
After a while the music stops but it then goes into making a continuous error beep.

What is supposed to happen with a jackpot on this machine?
Is it supposed to pay out one set of balls for every count on the counter after the music stops?

Until I can figure out what it's supposed to be doing it's hard to see where it's going wrong.