On Polar 76 EM (LMS system) when we turn on device and says to backgauge to front or rear it just goes to front and the lms value comes to display. When we give a command to the go to rear it try to comes to front. If we remove the lms cable from daughter (DB9 male connector) board or on lms black box (6 pin female jack) and we turn on the machine. without lms value the backgauge can be go front or rear in normal speed. What is the problem at here?