Fruit Machine Chat

Hi,
Please help me, my girlfriend brought me austin powers as a xmas present and i`ve had alot of fun with it since. But yesterday when i switched it on i got the Alarm 54-28 No 24v Drive opto! And as im not very clued up on fruit machine electronics need some help as to what it is and how to fix it. Any help will be much appreciated. Thanks

try a fuse in the PSU (power suply) or on the left hand side of the cabinet there may be a PCB with a fuse holder on it