The six special solenoids (pops, slings, kickbacks)
Six special solenoid circuits drive the pop bumpers, slingshots, kickbacks and sometimes other coils. On Fire! and earlier, a playfield switch fires the driver directly, without the CPU, and a second switch on the matrix does the scoring. Each has its own fuse. From Big Guns on, the CPU fires them, so a stuck switch only fires the coil once.
Systems
Related tips
- Special solenoid signal path, chip by chip
- No plug at CPU 1J18 means CPU-controlled special solenoids
- Special solenoids dead after fitting an early System 11 CPU in a later game
- How System 11 A/C switched solenoids work
- Whole groups of coils or all flashers dead: A/C select relay stuck
- One pop bumper weak and sluggish though coil and switches are fine: replace Q77
- Lizard eye flashers locked on, then not flashing: bad drive parts and a missing resistor
- Which transistor drives the A/C select relay
Source: Repairing Williams System 11 Pinball 1986 to 1990, Deel 1, Clay Harrell (pinrepair.com)