Troubleshooting452 Service Instructions 755 A/756 A - 00.0 - 02/20191002 Sewing motor insulation fault • Check motor phase and PE forlow-impedance connection• Replace sewing motor encoder• Replace sewing motor1004 Sewing motor error: Incorrectdirection of rotation• Replace encoder• Check plug assignment andchange, if necessary• Check wiring in machinedistributor and change it, ifnecessary• Test motor phases and check forcorrect value1005 • Sewing motor blocked• Encoder cable not connected• Encoder cable defective• Encoder defective• Remove blockage• Check encoder cable and replace,if necessary• Replace sewing motor1006 • Sewing motor error: Maximumspeed exceeded• Sewing motor cable defective• Sewing motor defective• Switch off and on the machineagain• Check class• Replace encoder• Replace sewing motor1007 Error in the reference run • Replace encoder• Eliminate stiff movement in thesewing machine1008 Fault in sewing motor encoder Replace encoder1010 • Cable to sewing motor refer-ence switch defective• Reference switch defective• Replace cable• Replace reference switch(part number 9815 935006)1011 Sewing motor synchronizationerror (encoder Z pulse missing)Switch off the control, use hand-wheel to turn, and switch on thecontrol again.If error is not corrected, checkencoder1012 Sewing motor synchronizationerrorReplace synchronizer1051 Sewing motor timeout• Cable to sewing motor refer-ence switch defective• Machine head not movingfreely• excessively high toothed belttension• Replace cable• Replace reference switch• Eliminate seizing• Check toothed belt tension1052 Sewing motor excess current,internal current increase to over25 A• Replace sewing motor cable• Replace encoder• Replace sewing motor• Replace controlError code Symbol Meaning Remedial action
