1) Check PLC input light inside cabinet. Light #1 should be flashing when the blade is cycling. When the blade is up, the LED should be on. 2) The blade up sensor that signals to the PLC may need adjustment. Verify 15 mm (0.060”) clearance between sensor and the cam. (Section 7.12) 3) Blade up sensor may need replacement.4) If Blade motor shaft has excessive play, replace motor.