Still no progress. I don't think the problem is in the multiplier after all.
With just one coin in (on each side), when one cherry hits 3 different things have happened. It pays 25 coins then waits and times out, pays 25 coins and stops saying "winner paid", or continues to pay and does not stop.
When 2 stars hit and it should pay 4, nothing happens at all!
Oh, the fingers on the payout unit are always at the same position after a pay, as in the picture in the last post.
I have examined every wire, Beau plug, Molex plug, contact and coil. There is no grease, oil, sludge or dust. I keep my machines very clean.
There is something is wrong in that payout unit.