The machine has a 24 volt mars dollar validator ( 2500 series) and a Coinco mdb coin mech.
Vend price is .75.
If, I insert change the machine will dispense the product. with no issues.
If, I insert 1 dollar bill the machine will dispense the product, but it will not drop the .25 cents in change. Also, the LED will reflect the .25 cents credit.
if I push the coin return, then it will drop the change/credit.
I have already swapped out the DBV, the coin mech, the harness and check the three fuses on the mother board. I am stumped.