Just brought a stars project back from the dead and it has motivated me to take another crack at a -17 that has haunted me for a few years. I've had it up to 5 flashes but it's back to locked on. I have plenty of good chips from a working board so suspect the machine pin sockets. Is there a better test ROM than Leons for Bally?

Thanks

Thanks slochar for the insight into the state of the art with Bally test ROMs. I got it working on the bench through brute force continuity and logic probing.

This made it a half day job from start to in-game test including the repair jumpers.

https://www.pinwiki.com/wiki/images/5/59/Bally_MPU_Board.pdf

Wonder why I never noticed this but a must have for anyone and probably the reason I found all the problems in the board I have been fighting for a while. Be sure to bookmark it.

I drew out something per chip but the color coding and layout made this a breeze

Thanks Pinwiki.com

Kenny

cysnake lools great can you share what you did to polish the coin door I’m about to start that also

Hello,

I'm putting an eight ball deluxe project back together and ran into a CPU problem I haven't seen so wanted to see if anyone has any suggestions where to look.

Game arrived non-working with rectifier and SDB rebuilt now. I have 30+ feature lights out with my -35 CPU that work in lamp test with my test CPU (Centaur ROMs). It appears to have the original ROMS so 2 questions I could use help with

1 Can this be ROM related and if so who do you use to burn 2532 game ROMs ? I want to try EBD /32 from Oliver. I can burn 2732 but this board is clean so want to try 2532.

2 Anything else while I wait for ROMS to check out, I probed all the lamp lines at the CPU and lamp board input and cant find any obvious dead pins. Also same lamps are out with a known working Weebly lamp board. Any suggestions to try?

Thanks for any help,

Kenny

Thanks, this was it. I put the CPU back in to test displays and more lights worked. Since I had not removed the lamp board connectors. I just replaced the J1 male pins since I had already re-pinned the female connector. So far so good 100% of lamps working now.

Also glad for the advice on the ROMs, Good point on the test during the flash sequence. Didn't think about that.

Amen, I just finished up an EBD restore from the dead but had more water damage than I thought and ended up with a whole pile of new woodworking tools. Will never get back what I put in. But I really like the result and would do it again. Especially with all the new tools I have

Im looking for a diagram someone posted (on one of these bally or game specific threads) that shows the voltages at various parts of the high voltage circuit of a Bally SDB. I have searched this and the game specific threads I follow and just keep missing it.

I completely rebuilt the HV section on an AS 2518-16 over the summer that I use as a backup and it just burned up R52 so I'm trying to figure out what is broken to let the voltage get too high across it.

Thanks if anyone remembers that.

This is the post. Really helped me with the diagram reorganized to make the circuit easier to understand. Now to do some readings.

https://pinside.com/pinball/forum/topic/bally-as-2518-22-voltage-regulator-problem-with-high-voltage#post-6207406