Does this issue only surface with the original regulator, or with a modern replacement as well?
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Actually, I wasn't even thinking of the PSU5 replacement...but that does bring up another thing to check.
I was curious if there was a difference between an original LM323K and one that was new(er).
Quoted from r6emperor:Then it probably also applies to goldball as well. It uses the combo lamp/solenoid driver board as well
Goldball and Grand Slam use a combo driver board, but it's a different board. Those two games use an AS-2518-147. Baby Pacman and Gators use an AS-2518-107. Since I haven't had occasion to look too closely at a Goldball, I'm not sure what the actual differences are between the two combo driver boards.
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