There's a good link on the Coinco page, here:
http://www.coinco.com/coin/faq/faq.asp#s75 (with a couple of photos)
1. Remove the acceptor from the changer and place in an area free of dirt and foreign material.
2. The S75-9800B has one switch module with five rocker switches located on the upper portion of the printed circuit board. These switches correspond to prices as follows:
1=$.05
2=$.10
3=$.20
4=$.40
5=$.80
When the top of the rocker switch is pushed in, the switch is in the ON position. Vend price is set by adding the value of all rocker switches in the ON position. EXAMPLE: Switches #2 and #3 in the ON position=30¢ vend price.
3. The S75-9800A has four price select slide switches (2 black and 2 white) located on the upper portion of the printed circuit board. These switches are ON when in the up position.
Set the vend price by sliding sufficient price select slide switches into the up position to total the desired price. Example: $.10 and $.40 in the up position=50¢