since I have 2 spinners if I swap them out, they both work on the wire that is hard wired to the board.
That confirms both spinners are good.
Connect the first spinner (master) to the hard-wired ribbon cable.
- That ribbon cable connects to the same encoder inputs as pins A and B. (X-axis)
- You can't have two spinners connected to the same pair of inputs, so if there is a spinner on the hard-wired ribbon cable, you can't have another spinner connected to pins A and B.
The second spinner (slave) cable has 4 wires:
- Red wire connects to 5v.
- Black wire connects to ground.
- The other two wires (data lines) connect to pins C and D. (Y-axis)
If that doesn't work, use your multimeter and check each data line to see if it can go both logic high (near 5v) and low. (near 0v)
You barely have to turn the spinner to change between high and low -- 1 full turn of the knob = 1200 phase steps with the TT2.
This quadrature waveform shows what you would see on the data lines (A and B) when you slowly turn the axis clockwise.
Scott