Undo the Firepower 2732 change on a System 6 CPU board
Steps
- Take off the added A11 jumper (IC14 pin 21 to the interboard connector).
- Bridge IC14 pin 21 back to the wide +5 V trace at pin 24 with solder and a short wire.
- Set J3/J4 and fit the chips the target game needs.
Systems
Games
Related tips
- Run Firepower on a System 7 CPU board
- Firepower original ROM layout and jumpers
- What changed on the System 6A CPU board
- Firepower CPU ROM configuration and jumpers
- Installing a single-EPROM adapter in the CPU socket
- System 6 CPU board changes and ROM layout
- Lights up but dead after storage: leaked batteries on the board
- Number-of-players backglass lamps dead after playfield work: reseat the MPU plugs
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Two, Clay Harrell (pinrepair.com)