The 19 solenoid driver transistors

Coils are not multiplexed. The 19 solenoid drivers form a row along the top edge of the board: Q7, the right-most, runs the flipper relay and the other 18 run playfield coils. The originals are SE9302, 2N6045, TIP122 or NTE263 types; TIP102 is a sturdier replacement.

Systems

• Bally 6803

Related tips

• Solenoid driver transistor types
• CPU and driver board transistors by position
• Test a TIP120/TIP102 solenoid driver with a meter
• 20-second test for shorted coil driver transistors
• Solenoid driver test at 2J9 and 2J11 with Leon's code
• Which transistor drives which WPC solenoid and lamp circuits
• Testing the 2N6043 coil drivers
• Replace failed TIP122 drivers with TIP102

Source: Repairing Bally 6803 Pinball Games from 1985 to 1989, Clay Harrell (pinrepair.com)