Diagnostic information 2-113Paper feed service checkIf you have a 936 Transport Motor Error go to “Main drive service check” on page 2-106.Autocompensator fails to feed paper. Failures occur randomly throughout the stackof paperPaper feed failures occur only near the top of the stack of paperThe most common cause of this problem is paper curl. Remove the paper from tray x and check for the naturalcurvature in the paper. Reinstall the paper in the correct manner. If the problem persists, it may be necessary toreduce the stack height. Replace both pick rolls if the paper appears to be flat in the tray but there is still aproblem.Failures occur mainly near the bottom of the stack of paperThe autocompensator pick arm may not be coming down far enough to allow the pick rolls to properly contactthe paper. Also the autocompensator motor may be failing. If this problem continues replace theautocompensator assembly.Double feeding paperNote: If double feeding paper occurs mostly from the bottom of the stack, check for missing or damagedrestraint pads in the tray.FRU Action1 Alignment assembly Check to ensure the alignment assembly is correctly attached to theleft side frame and the mounting screws are tight. Check thealignment assembly for worn rollers, contaminated rollers, or binds.Replace the alignment assembly if any problem is found.2 Inner deflector Check the inner paper deflector for correct installation. If the deflectoris bowed or not fitting correctly, replace the deflector.FRU Action1 Pass thru sensor Check the pass thru sensor for correct installation and operation.2 Autocompensatorassembly The autocompensator pick roll shaft assembly is not providingenough torque if the pick rollers are not picking the paper correctly.Replace the autocompensator assembly.3 Wear strips in tray xproblem is found. Check the wear strips for excessive wear, scratches, or rough spots.Replace the wear strips if a problem is found.FRU Action1 Paper Paper is usually the primary cause of a double feeding paperproblem. Flex the paper before placing the paper in the tray. Edge-welded paper is the most common cause of double feeding. Loadingthe paper in the tray in different locations and directions and usingrough paper and short grain paper also causes double feeding.2 Autocompensator Make sure the counterbalance spring is not missing, loose, or brokenat the top of the autocompensator arm assembly. If you find aproblem, replace the autocompensator assembly.
