[Misc] Riso GR3750 from GR3770

[PositiveBuddy]

I had a old GR3770 machine that had an external Controller. An SC7700.
The machine was damaged and disposed of. But before juncking the machine I salvage the SC7700 and parts needed for a future machine. These parts worked fine. I recently acquired a GR3750. Not exactly what I had, but I thought close enough. My salvaged parts from the 3770 fit fine and I adjusted the settings the SC7700 external card showed I had to do. But when I start everything up, the SC7700 has the blinking light that says no communication is possible with the Riso?
Does anybody know if I need to flip any of the dip switches or have any idea why this is happening?
Thanks

[mikadonovan]

I work on these machines also, but I don't have an answer for you. Try posting this on the digital duplicator forum. Those guys are pretty slick and will probably be able to help.