Hi linwood
& Welcome to
What you have there is an IGT S+
It is a very solid & versatile machine
To change payout requires changing an eprom (reel chip) on the main board at the back of the machine
behind the hopper. There should be a black knob on the casing which you pull up on to remove the board.
You will have a Game eprom and a Reel eprom on the board. The Game chip runs various "types" of games
and the Reel chip is specific to the Theme or Title of game you have installed.
TONS of info can be found on this site about the IGT S+ but your BEST FRIEND is the "Rick's FAQ Files" button
at the top of the screen. There you can find set-up instructions, common errors, and the all important
"Game Bible" that is a tremendous resource in identifying Game Titles and Corresponding Chips.
Here is the link to YOUR game which shows the various chips & payout % ....match yours up to see what you have
2cm Black TieHappy Gaming!!!
tjkeller Docs