Quoted from Nfmsuprar1:I'll reach out to JJP. Thanks for your help!
Move the opto plug on the opto control board to another spot on the opto control board - see if the opto pair starts reading in that spot on the grid. Then take a known good opto from another position and plug it into that spot on the control board. See if it still works there. This way you will find out if the opto pair itself is okay and if there might be a problem with that position on the control board.