Re-jumper a System 7 CPU from Defender/Hyperball/Star Light to a standard game
Steps
- Fit jumpers 3, 10 and 26.
- Remove jumpers 5, 27 and 28.
- Fit jumper 6 and remove jumper 24.
- Fit the standard System 7 EPROM set (2532 at IC17, 2716s at IC14, IC20 and IC26). Reverse the changes to go the other way.
Systems
Games
Related tips
- System 7 CPU jumpers differ for Hyperball, Defender and Star Light
- System 7 CPU ROM sockets
- Solenoid fuse F2 blows at power-up as every coil fires: CPU blanking circuit
- CPU LEDs flash once, then come back on and stay on
- Identifying a System 3 to 7 CPU board
- System 7 CPU board test points
- A System 7 CPU board can run any System 3 to 7 game
- Run a System 6/7 CPU board on +5 V only
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Two, Clay Harrell (pinrepair.com)