Firepower
Williams, 1980You're currently viewing posts by Pinsider slochar.
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Here is how that circuit works:
https://pinside.com/pinball/forum/topic/alien-poker-pop-bumper-not-working#post-6534239
(the highlight wouldn't necessarily be for your pop). Likely the activation switch is stuck or something else that feeds the circuit.
The switch test does not show the special solenoid activation switches (they are not part of the switch matrix).
Ignore the schematics didn't realize you have a RD in there.
It's still going to have activation chips etc. but if you measured the coil and it's 3.5-6 ohms it's fine. There's 2 chips in the circuit before the predriver/driver (at least on original williams setup) that can be blown and cause the lockon too, so they need to be tested as well.
I seriously doubt that the coil is the issue.
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Hawesville, KY