Unused CPU connector at the upper right on CPU-controlled special coil games

On The Who's Tommy (and other games whose special solenoids are run by the CPU) the connector at the top right corner of the CPU board is left empty. That is normal and not a missing plug.

Systems

• Data East/Sega CPU Version 3b

Games

• The Who's Tommy Pinball Wizard

Related tips

• Logic probe readings on the matrix connectors of a booted CPU
• Flippers and special coils all dead
• Random coils fire instead of flashers with a new driver board: relay has the wrong coil
• Other CPU jumpers and what they set
• Bench-testing a CPU board on +5 V
• CPU boards are only downward compatible
• CPU EPROM jumpers J4 and J5
• Where the TIP122 drivers are on the CPU board

Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part One, Clay Harrell (pinrepair.com)