The CA3081 on the driver board is a transistor array
The CA3081 (NTE916) pre-driver on the solenoid driver board looks like a chip but holds several transistors in one package. It feeds the coil driver transistors.
Systems
Related tips
- Test the CA3081 pre-driver array
- Test solenoid driver transistors with the game off
- Test the 1N4004 diode behind a driver transistor
- Fire a coil by grounding its driver transistor tab (game on)
- Solenoid driver board: transistor, diode, resistor and connector for each driver
- Kickout coil burns up in attract mode: driver transistor, resistor and the CA3081 at U3
- AS-2518-16 and AS-2518-22 solenoid driver boards interchange
- TIP102 is a good substitute for SE9302 coil drivers
Source: Repairing Bally Electronic Pinball Games from 1977 to 1985, Part One, Clay Harrell (pinrepair.com)