If anyone has a schematic for this board please let me know.
I did some more testing.
On the board there are a few test points. One for each axis, I assume these are the signal to the amps. And one that comes off a clock that gets sent to each amp.
When powered up I get a clean clock signal on the one test point on my scope.
But whatever voltage I give to the signal inputs I get nothing on each axis test point.
I am suspecting either my input signal is incorrect somehow or there is something on the board that is bad and stopping the signal from getting to the amps.
Anyone have any insight?