Need help with a Sigma Blackjack Machine, won't coin up

[azgamingslots]

you can check the infrared optics with your cell phone camera -they will light up on the camera screen.

coin in and coin out optics are different, they can't be swapped,  in a pinch,  i have soldered in extra senders/emitters to a coin drop optic to make it work for coin in.

with older sigmas check connections at the board and the optics/comparitor, usually one is dirty or a pin has pulled out, maybe a broken wire from door being opened a zillion times in its life,  -pull on each wire around hinge, one at a time -you may find a stretchy one.

[Amachanic]

I've replaced both coin optic with known good ones. I'll check the pins on the door board. If I had to guess there's a problem with a hopper board, but I'm not sure if it has one or if it does what one is it ??