I presume you checked where the board sensor cable plugs in to the small board on the back of the Y truck and the 3/4' wide cable that also plugs into that board. the wider cable goes down to the controller board. Do youget any reading from the bit sensor it is on the some circuit board as the board sensor. Be carful with plugging in the cables it is easy to peal back the metalic contact when pushing the cable into the plug. Some times the glue gets into the plug and insulate the connection.
Ron Baird Ottawa, Ontario (summer)
Rockport, Texas (winter)
Beta Tester since Jan. 2005