Lexmark X644E Service Manual - Page 195

7002-xxx Autocompensator fails to feed paper. Failures occur randomly throughout the stack of paper FRU 1 Pass thru sensor 2 Autocompensator assembly 3 Wear strips in tray x problem is found. Action Check the pass thru sensor for correct installation and operation. The autocompensator pick roll shaft assembly is not providing enough torque if the pick rollers are not picking the paper correctly. Replace the autocompensator assembly. Check the wear strips for excessive wear, scratches, or rough spots. Replace the wear strips if a problem is found. Paper feed failures occur only near the top of the stack of paper The most common cause of this problem is paper curl. Remove the paper from tray x and check for the natural curvature in the paper. Reinstall the paper in the correct manner. If the problem persists, it may be necessary to reduce the stack height. Replace both pick rolls if the paper appears to be flat in the tray but there is still a problem. Failures occur mainly near the bottom of the stack of paper The autocompensator pick arm may not be coming down far enough to allow the pick rolls to properly contact the paper. Also the autocompensator motor may be failing. If this problem continues replace the autocompensator assembly. Double feeding paper Note: If double feeding paper occurs mostly from the bottom of the stack, check for missing or damaged restraint pads in the tray. FRU 1 Paper 2 Autocompensator Action Paper is usually the primary cause of a double feeding paper problem. Flex the paper before placing the paper in the tray. Edgewelded paper is the most common cause of double feeding. Loading the paper in the tray in different locations and directions and using rough paper and short grain paper also causes double feeding. Make sure the counterbalance spring is not missing, loose, or broken at the top of the autocompensator arm assembly. If you find a problem, replace the autocompensator assembly. Paper fails to feed from the multipurpose tray The pick roll should make one complete revolution and stop with the flat side down. If the pick roll turns but does not pick paper, check the roll for signs of wear, oil or grease on the surface of the pick roll or slick spots. If you find a problem, replace the pick roll assembly. Check to ensure the media that is being fed through the multipurpose tray assembly meets recommended paper specifications. Diagnostic information 2-157