In the process of repairing my Pepsi machine, I needed to figure out how the Vari-Price 50 changer actually worked. There are no decent circuit diagrams for how the changer works.

Common Wires

Wire	Location
Black-J-24	5 INV
Black-J-12	C
Black-J-28	10 INV
Black-J-30	Unlabeled (Above Credit)
Yellow	CREDIT

Coin Setting Wires

	10	15	20	25	30	35	40	45	50
	Setting
White-J-28	10	15	20	25	30	35	40	45	50
Blue-J-27	20	25	30	35	40	45	50	50	S3
Yellow-J-23	30	35	40	45	50	50	S1	S1	S1
Red-J-25	S2	S1	S1	S1	S1	S2	50	S2	S2
Black-J-26	10 20 30 40	15 25 35 45	10 20 30 40	15 25 35 45	10 20 30 40	15 25 35 45	10 20 30 40	15 25 35 45	10 20 30 40

Board Images

(Click on image to zoom in)

Anticipated Change

		10	15	20	25	30	35	40	45	50
		Amount Inserted
Price Setting	10	None	Nickle	Dime	Dime+Nickle	2 Dimes	Not Possible
	15	Not Enough	None	Nickle	Dime	Dime+Nickle	2 Dimes	Not Possible
	20	Not Enough		None	Nickle	Dime	Dime+Nickle	2 Dimes	Not Possible
	25	Not Enough			None	Nickle	Dime	Dime+Nickle	2 Dimes	Not Possible
	30	Not Enough				None	Nickle	Dime	Dime+Nickle	2 Dimes
	35	Not Enough					None	Nickle	Dime	Dime+Nickle
	40	Not Enough						None	Nickle	Dime
	45	Not Enough							None	Nickle
	50	Not Enough								None

Connections to C at Dispense State

		10	15	20	25	30	35	40	45	50
		Amount Inserted
Price Setting	10	W- - - -K	W- - - -	W-B- - -K	W-B- - -	W-B-Y- -K	Not Possible
	15	Not Enough	W- - - -K	W- - - -	W-B- - -K	W-B- - -	W-B-Y- -K	Not Possible
	20	Not Enough		W- - - -K	W- - - -	W-B- - -K	W-B- - -	W-B-Y- -K	Not Possible
	25	Not Enough			W- - - -K	W- - - -	W-B- - -K	W-B- - -	W-B-Y- -K	Not Possible
	30	Not Enough				W- - - -K	W- - - -	W-B- - -K	W-B- - -	W-B-Y- -K
	35	Not Enough					W- - - -K	W- - - -	W-B- - -K	W-B-Y- -
	40	Not Enough						W- - - -K	W- - - -	W-B- -R-K
	45	Not Enough							W- - - -K	W-B- - -
	50	Not Enough								W- - - -