Controlled solenoids 9-16
Solenoids 9 to 16 are "controlled" solenoids: each driver runs one device only, with no bank switching. On games that do not multiplex (High Speed and Grand Lizard), every solenoid is a controlled solenoid.
Systems
Related tips
- No plug at CPU 1J18 means CPU-controlled special solenoids
- Special solenoid signal path, chip by chip
- Whole groups of coils or all flashers dead: A/C select relay stuck
- Special solenoids dead after fitting an early System 11 CPU in a later game
- Lizard eye flashers locked on, then not flashing: bad drive parts and a missing resistor
- One pop bumper weak and sluggish though coil and switches are fine: replace Q77
- Pop bumper or slingshot machine-guns or locks on (Fire! and earlier)
- Which transistor drives the A/C select relay
Source: Repairing Williams System 11 Pinball 1986 to 1990, Deel 1, Clay Harrell (pinrepair.com)