How Fliptronic flipper drive works
The flipper board can drive four flippers. A button press makes the CPU switch on both the TIP36C power transistor and the TIP102 hold transistor. When the end-of-stroke switch closes at full travel the CPU drops the TIP36C and keeps the TIP102 on, so only the thin hold winding stays powered.
Systems
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Source: Pinball Machines: How They Work & Troubleshooting, Norbert Snicer