How System 11 special solenoids work
The six special solenoids are slingshots and pop bumpers. On earlier System 11 games their playfield switch fires the coil through logic on the CPU board without the processor, and the coil stays on as long as the switch is closed; the processor only enables them in play and fires them in the solenoid test.
Systems
Related tips
- Sling or bumper locks on at power-up (System 11)
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Source: Pinball Machines: How They Work & Troubleshooting, Norbert Snicer