IGT S vs S+?

[Midcoastsurf]

Can someone please shed some more light on the differences between these two?  I have two IGT S games I believe, but not sure.  The MPU board sits to the left of the hopper, not behind it.

[Shaggy]

Here's a pic of an early S+ machine. Under the third plug on the board is the test switch.

Dave

[Shaggy]

Also as I remember S games do not have door optics on them. The insides look a lot different than the S+.

Dave

[Yoeddy1]

I think the MPU is on the back wall on an S as well.

Thanks,
Jason

[mvco]

Yes indeed, the older S games did have the computer on the back wall behind the hopper.  Early S-Plus had them to the left of the hopper.  About mid 1993, they started offering embedded bill acceptors and moved the board to the back wall like the old S games were.

[knagl]

I just posted this in a different thread about a different machine, but the answer is the same, so I'll post it here, too! 

From my understanding, the main difference between an "S" and an S+ is in the MPU board.  The MPU board on an S used wire harnesses that had to be plugged and unplugged by hand to remove the board, while the S+ design used the fixed motherboard in the bottom of the machine with the connector that the S+ MPU board would just plug directly into.  No need to plug in wire harnesses by hand -- just remove and insert the board, with the power off of course, and it would be disconnected or connected.

In a nutshell, if your MPU tray has a black knob on it and all you have to do to remove the board is lift the tray out of the machine, you have an S+.  If you have to disconnect wire harnesses from the board to remove it, S (non-plus).

[asgard]

Can someone please shed some more light on the differences between these two?  I have two IGT S games I believe, but not sure.  The MPU board sits to the left of the hopper, not behind it.

I operate both models and the main differences are the power supply and MPU board. The S model doesn't have a mother board or door optics but otherwise from that all parts are interchangeable.