Making Bally and Stern 7-digit displays swap between makes
Six-digit Bally and Stern displays interchange; 7-digit ones do not unless pins 11 and 12 on the display are wired together. The Stern board is deeper, so the mounting tray must be moved to the other side of the backbox door, and a Bally board in a Stern bracket can touch metal since it does not reach the rubber supports. Stern 7-digit boards cannot drive the commas, so they show none in a Bally game.
Systems
Related tips
- Bally and Stern score display boards
- How a Bally display board drives its glass
- One digit missing on a score display
- Score display digit parts by position
- One segment always lit on a display
- First checks before repairing Bally score displays
- Display test counts out of order (0,1,0,1,4,5...)
- Same digit missing or stuck on every display
Source: Repairing Bally Electronic Pinball Games from 1977 to 1985, Part Three, Clay Harrell (pinrepair.com)