Check the end of stroke switch.

Just saw you started two threads on it. When I read your first thread you saw they are doing it on their own. I was thinking you were doing nothing. Are you actually holding the button and this happens during a press of the button? If so, it could be your low power is not there when the high power is shut off by the EOS switch.

Go into switch edge test and hold the flipper button. Does it stay lit or flutter? If it stays lit then I'd suspect the end of stroke.

I don't think EOS would cause this. Sounds like an opto or opto power supply issue. Be sure the flipper optos are clean and working properly in test as markmon suggests.

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Rob Anthony
Pinball Classics
http://LockWhenLit.com
Quality Board Work - In Home Service
314-766-4587

Sorry. Watching tv and typing so didnt properly explain. I'd suspect the end of stroke was triggering. The problem could be the hold power. As hold engages but if its not working eos triggers and causes another full power pulse. This repeats and looks like the flipper is jumping.

So i have a machine with one of the 'magnet' style flipper boards from GLM. It flips when the auto plunger fires.. maybe some EMF triggering it or something?

I see this machine doesnt have an auto plunger but if you do have these same flipper boards, consider adjusting.