Bally and Stern solenoid driver boards interchange
The solenoid driver/voltage regulator smooths and regulates the supply and drives the coils. Bally and Stern versions swap, and Bally's AS2518-16 and AS2518-22 are interchangeable; the -22 adds an 8AG 3/16 A fuse in the high-voltage section.
Systems
Related tips
- AS-2518-16 and AS-2518-22 solenoid driver boards interchange
- Test solenoid driver transistors with the game off
- Solenoid driver/regulator board test point voltages
- Jumper TP1 to TP3 on the solenoid driver
- Solenoid driver/voltage regulator board test points
- Solenoid driver board: how the MPU selects a coil
- Solenoid driver board: test points and regulators on the layout aid
- Solenoid driver board: transistor, diode, resistor and connector for each driver
Source: Repairing Bally Electronic Pinball Games from 1977 to 1985, Part One, Clay Harrell (pinrepair.com)