Replace SE9302 drivers with TIP102, and renew the parts around them
Whenever an SE9302 solenoid driver fails, fit a TIP102, which handles more current. After any locked-on coil, also replace the coil diode (band to the power lug, the one with two wires), the 1N4004 CR diode on the board behind that transistor, and its 330 ohm 1/4 W resistor, since they are often damaged too.
Systems
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- TIP102 is a good substitute for SE9302 coil drivers
- Rebuild the solenoid driver board high-voltage section
Source: Repairing Bally Electronic Pinball Games from 1977 to 1985, Part Three, Clay Harrell (pinrepair.com)