Fruit Machine Chat

I have Funny Money fruit machine, it works fine on free play, also works fine when putting money in BUT wont pay out. The hopper works in an other machine , i have tried a new main board still wont work, tried the small board which the hopper plugs into still nothing and ive tried the loom between the hopper and the samll board but still nothing.
All i get is a strim alarm.
ANY HELP ??
PS i can hear the pay out meter counting when it is trying to pay out

ANYBODY GOT ANY IDEAS ????