Interesting, I just spent the last week off and on sorting out my Bally schematics but they are all in large hard copies but I'm not sure which exact model number your looking for!
The best place for Bally schematics, reel wiper assemblies, counter discs, wiring diagrams, Etc. is at this link below;
http://bingo.cdyn.com/slots/bally_manuals/If it's not there I don't know what to tell you!
A good friend of mine just donated everything he had to a fella from NLG and he may be able to help!
Wolftalk on NLG, New Life Games!
Bona Fortuna!
MONTI
P.S.
I may have mislead you as you may be speaking of the early BALLY DRAW BELL CONSOLES like this photo of one I used to have years ago here below!
The site I gave you a link to would probably not help you but possibly this one would!
http://rwatts.cdyn.com/Machines/download_area.htmlCIAO!
MONTI