I am a newbie at em repair and could use some help. Bought Chicago Coin's Casino and am in the process of restoring it. I have cleaned all the scoring wheels and step units, checked all relays and silenoids and switches. Everything works mechanically. However, for a while, the first 3 balls worked fine. You start a game, the ball is ejected and you play. Then the ball returns, totals, then ejects for the next ball. But from ball 3 on up, it would not eject / advance the ball. Now it does not eject the ball at any time.
Any input would be greatly appreciated

Thank you. Yes I have a schematic. I will look into those things.

I looked at the outhole switch, outhole relay and the score motor contacts. Everything seems to be ok from my inspection, but as I said I am a newbie. Last night I put my DDM on the outhole relay and it checked out. In fact, today I played a game, and for the 4th and 5th balls, it worked perfectly: totallying the score then ejecting the ball - so I know physically it all works. It's just a bug somewhere and I don't know enough to figure it out. I have been looking and studying the schematic until I get a headache. I inspect and re-inspect all related items. I check for wires. I checked all the fuses. Why would it work once in a while and not all the time? My thought was it must be some kind of loose connection, or maybe a stepper not returning properly. All the wires are intact and soldered solid. I have cleaned and adjusted all step switches so they all return properly.

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I have inspected the player control relay and it all looks good. I do not know where to find the ball count unit or game over contact. Most everything is labeled except for a few steppers inside the cabinet. I am assuming the ball count unit is one of them. My schematic is too big to get a good pic, so I took pics of inside the cabinet and under the playfield instead. Hopefully you can point me in the right direction.
Thank You Pin-it for your help. I have been reading other posts in this forum and you clearly know your stuff. I am assuming you do this for a living?9-17-14a-334.jpg9-17-14a 002-942.jpg9-17-14a 001-909.jpg

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Sorry for the delay - been having trouble logging in.
I have cleaned the contacts for the out hole switch, and the switch in the ball shoot. I have cleaned the switches on the out hole relay. I have cleaned the switches on the scoring motor. I lifted the playfield and simulated some scoring. Then held down the out hole switch to watch what happens inside the cabinet when it totals. I was able to locate the ball count unit and quickly labeled it.
I have attached snips of the schematic and scoring motor diagram, if that helps.
Thank You

The game is currently set up for 5 balls. I have tried 3 ball setup, but no difference. Also tried difference high score settings: replay, extra ball, and nothing. No difference. Thank you for making it clearer to me the sequence of things. I thought I already cleaned all the appropriate contacts, etc., but I will go back in there and double, triple check.
Thank You

Well, I'm at a loss. I thought I checked / cleaned everything involved but still nothing works. Wish you were here in Tucson, I would pay you to come take a look.

Thank you. I will try that. Thanks for all your help!

I have not tried the continuity test yet, but I have revisited the schematic. Was trying to pinpoint what step is between catching the ball, totaling it and ejecting it. Looks like I need to find the Bonus Unit Post Switch, but I don't know where that is. I have located the bonus collect relay, and bonus relay, but not the switch. I have engaged the outhole relay manually, and it works. I have engaged the bonus relays manually, and they work. I have engaged the score motor and it works (except for tripping the outhole relay). On the schematic, the Bonus Unit Post Switch is between the outhole switch and score motor.