I feel robbed when I win a free play and dont hear the knocker.
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Would this possibly be a connection problem between master display board and cpu board?
I feel your pain at being robbed!
Don't reckon it can be a connector issue. Much more likely to be game settings and I'd be looking hard at these. To me they should be
14, 15, 16 & 17 = a non zero number and ascending in value
25 = a non zero number for number of credits awarded for Hi
27 = 00 for special awards credits
28 = 00 for award credits at replay score
This stuff is straight from the Instruction manual which I assume you've got?