Hi Chuck, This could be a number of things that might cause this issue,try out some of these suggestions below.
1. Make sure the coins are stacked correctly and not jammed at the bottom of coin tube
2.Remove the mechanism and make a line on the inside support A frame reel arm to simulate a payout as if it's in the case, cycle and look to see if the coin slides reset back when you line up a win.
3.If the slides don't reset look for a coin that's jammed in the slides, or something is preventing the horizontal levers from moving freely.
4. Look for missing screws and broken/missing springs in the mechanism.
5.Check safety slide, slide hold lever and payout slide lock to make sure they are in the correct positions
