Well the way I fix things, is to take it appart and see what's inside. Check what they have it there for encoders, is it glass circle with lines or some soft of a magnetic deal. I don't think they made the encoders so you will see a brand on them, if so then yo can get a wirring diagram if the company is still around. Then you will be able to test each encoder one by one with a o'scope or maybe a regular tester. If the encoders work them move to the interface card. Look over the wires in the joins the connectors any other electrical things that move.
__________________
Dennis |