After fitting a replacement CPU board, turning match off makes it match nearly every game, and changing balls per game to 5 gives a one-ball game.
Settings behave strangely on a replacement CPU: use the later adjustment sheet
Cause: The manual's adjustment list is for the earlier ('yellow') Flash code; the replacement board runs the later ('green') version, which numbers the adjustments differently.
Checks
- Find the service bulletin with the later adjustment sheet and compare it to what the board shows.
Fix
- Set the adjustments using the later adjustment sheet, then put back any settings changed by mistake.
Systems
Games
Related tips
- How a good System 3 to 7 CPU behaves at power-on
- Fitting the combined 2764 to a System 3/4 CPU board
- Identifying a System 3 to 7 CPU board
- A System 7 CPU board can run any System 3 to 7 game
- Which CPU boards can run which system firmware
- Williams CPU boards only self-test when asked
- Separating and refitting the CPU and driver boards
- Choosing and mounting replacement sockets
Source: Pinball Repair help group!! (Facebook group)