Hyperball driver board is unique

Hyperball uses standard System 7 CPU, power supply and display boards (the CPU needs its ROM jumpers changed to move to another game), but its driver board is special to that game and cannot be converted for any other Williams game, nor can another driver board be used in it.

Systems

• Williams System 7

Related tips

• System 6 and System 7 driver boards can be swapped for testing
• Driver board transistors and what they drive
• Test a 2N4401 pre-driver with a meter
• Leon's code with the driver board attached
• Add a blanking LED to a driver board
• Spare transistors for driver board and power supply
• Test a TIP120/TIP102 solenoid driver with a meter
• A low resistance coil points to a bad driver transistor

Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part One, Clay Harrell (pinrepair.com)