Coil outputs available on System 3-7
The driver board has 16 regular solenoid drivers plus six special solenoids, 22 in all. System 3 to 6 use coils 9 to 13 to trigger sounds; on System 7 a sound PIA on the CPU frees 9 to 13 for coils. System 7 coil test also lists 23 and 24 (never used, no driver transistors) and 25 (the flipper relay).
Systems
Related tips
- The coin lockout coil is meant to be on
- Check the wire from the coil to its driver transistor
- Pop bumper or slingshot locked on
- A cracked coil diode keeps killing its driver transistor
- Solenoid driver test at 2J9 and 2J11 with Leon's code
- Special solenoid trigger test at 2J12/2J13
- CPU-controlled and special solenoids
- Pop or sling works in the game but not in test, or the reverse
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part One, Clay Harrell (pinrepair.com)