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On this game, I'm pretty sure that the game over relay is continuous duty, so the coil is energized the entire time the game is sitting in game over. If that is the case, I suspect that this additional coil was added to serve as a current-limiting resistor for the game over relay coil, so that coil would not run so hot.
It's an interesting idea, but the execution seems less than professional. As Spinal Tap would say, there's such a fine line between stupid and clever.
- TimMe
Quoted from Geofflove:I’m not sure it is. I think it’s energised during game play.
I just checked my schematic for Jet Spin, and confirmed that the game over relay is indeed constantly energized when the game is over. This is consistent with all other multi-player GTB EMs of this era.
It may seem counter-intuitive, but that's how they did it.
- TimMe
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