(Topic ID: 246986)

Eight Ball Freezes

By Pin_Bob

4 years ago



Topic Stats

  • 6 posts
  • 4 Pinsiders participating
  • Latest reply 4 years ago by barakandl
  • Topic is favorited by 1 Pinsider

You

Linked Games

You're currently viewing posts by Pinsider pin_bob.
Click here to go back to viewing the entire thread.

#1 4 years ago

Hi Everyone!

I have a 1977 Bally Eight Ball that I just bought. It was missing the MPU when I bought it and appeared to have been sitting around for many years. I purchased an AllTek ultimate MPU and I installed it according to the instructions. The game will turn on and I can enter the self diagnostics mode with no problems. I was able to get all the feature lamps fixed and I ran it through the solenoid tests. All solenoids work with the exception of the knocker and one chime. The coils on these two are bad and the wires have been cut. I have ordered the coils and transistors for these. I ran the stuck switch test and it shows that switch #2 is stuck. I inspected the switch and it is not out of adjustment. I removed the wires to that switch and the machine still shows that switch is stuck. Figuring this would not stop the game from running (?) I finished the game adjustments and book keeping and attempted to start the game. The intro chimes play fine, the flippers work (switches held closed) but when it gets to about the point where the ball ejects, some spotted lamps light just as the relay on the solenoid driver clicks and the game freezes and the flippers fall. From this point the general illumination lights are lit, some feature lamps are lit (spotted) but nothing else seems to work. Points cannot be scored and solenoids will not work. I try to enter self diagnostics from here but that will not work either. I turn the game off and back on and I get back to where I was with attract mode working (racked balls light up in sequence as normal) but as soon as I try to start a game it freezes again. While frozen, I checked the voltages at all test points on the power supply and solenoid driver and they all seem to be fine. I can also enter self diagnostic mode again.

The switch that diagnostics shows as stuck (#2) has a diode and also a cap across it (I do not see it on the playfield diagram). I was wondering if this switch problem could have something to do with the game freezing?

I did plug the MPU into another game and it works fine in that game. I also tried the memory clear feature but that did not change anything.

Any ideas?

I have also ordered all the pins and connectors to replace all the female connectors going to every board. I have also reflowed the header pins on the solenoid driver board but not the power supply board yet.

Bob

#5 4 years ago

First of all I want to thank everyone who replied here. I am fairly new to pinside and what a great group of people with willingness to help. BarakandI, I failed to remember that when troubleshooting any problem always look at the obvious first. Yes, the tilt plumb bob was off the hook and shorting out causing the game to freeze. I had the backglass off so I never saw the tilt light come on. My bad.......

On the switch error, I clipped the cap off and now the error is gone and the switch works fine. Should I replace that cap or just leave it off? The game seems to now play fine.

On a side note and off topic for this sub group, the playfield paint is in good general condition but the surface looks rough. I have not cleaned or waxed it yet. All the rubbers need replacing so I was going to strip everything off of it and maybe clear coat it. What are the thoughts and/or suggestions in regards to sealing and old playfield?

Promoted items from the Pinside Marketplace
$ 99.00
$ 29.99
Cabinet - Shooter Rods
Pinball Shark
Shooter rods
$ 44.99
Cabinet - Shooter Rods
Pinball Shark
Shooter rods

You're currently viewing posts by Pinsider pin_bob.
Click here to go back to viewing the entire thread.

Reply

Wanna join the discussion? Please sign in to reply to this topic.

Hey there! Welcome to Pinside!

Donate to Pinside

Great to see you're enjoying Pinside! Did you know Pinside is able to run without any 3rd-party banners or ads, thanks to the support from our visitors? Please consider a donation to Pinside and get anext to your username to show for it! Or better yet, subscribe to Pinside+!


This page was printed from https://pinside.com/pinball/forum/topic/eight-ball-freezes?tu=pin_bob and we tried optimising it for printing. Some page elements may have been deliberately hidden.

Scan the QR code on the left to jump to the URL this document was printed from.