I picked up a “non-working” Macy continental 3 slot machine.

I quickly discovered the fuse on the motherboard was bad. Of course, nothing is that easy and after a while, i finally won and it wouldn’t eject any coins. I found the hopper was spinning the wrong way. After many hours of checking over the cable and board. I found the dc ground pin had a cracked solder joint and after reflowing that it worked perfectly every time ejecting the correct amount of coins. I then I got everything working I replaced all the light bulbs with LEDs.