System 11 backbox boards at a glance
The System 11 "CPU board" is a combined logic and driver board holding all the TIP122/102 solenoid drivers. From Big Guns on, an auxiliary power driver board adds eight TIP36c high-power drivers, each pre-driven by a TIP122/102 on the CPU board. Earlier games have a smaller flipper power supply board in that spot. Board numbers ending in xxx carry the game number.
Systems
Related tips
- System 11 backbox boards and supplies
- Later System 11 moved relay and diode boards to the backbox
- How the System 11 A/C bank select works
- Which System 11 CPU boards fit which games
- How System 11 A/C switched solenoids work
- System 11 CPU board connectors
- What the System 11 auxiliary power driver board does
- Where the coil diodes are on System 11
Source: Repairing Williams System 11 Pinball 1986 to 1990, Deel 1, Clay Harrell (pinrepair.com)