AM-180 Wiring Diagram

Hi - electrical engineer at BIC Graphic in Clearwater FL.

We have several variations of the AM-180 Style" of printers here in the plant.
I have been tasked with adding a speed control pot to a couple of the machines. the vintage of the machine is making it difficult to find any sort of wiring diagram. ill try and post a pic of the specific DC control board I'm trying to find info on.
Help? Anyone?

Brian

Location: 
United States