Troubleshooting456 Service Instructions 755 A/756 A - 00.0 - 02/20192330 Step motor corner knife supportnot responding: Step motor carddefective• Perform software update p. 431• Replace step motor card• Replace control2353 Step motor tape feeder excessvoltage - mains voltage too highCheck mains voltage2355 Stroke position step motoroverload• blocked/sluggish• defective• Control defective• Eliminate seizing/stiff movement• Replace step motor• Replace control2356 Step motor tape feeder overtem-perature• seized up• defective• Control defective• Eliminate seizing• Replace step motor tape feeder• Replace control2401 Step motor error at corner knife,seam begin• Cable to reference switchdefective• Reference switch defectiveCheck cable to reference switch andreplace, if necessary2430 Step motor needle transport notresponding: Step motor carddefective• Perform software update p. 431• Replace step motor card• Replace control2501 Reference time out step motortransport clamp adjustment left• Eliminate blockage or seizing• Replace step motor, checkreference switch• Adjust transport clamp p. 3602505 Error step motor transport clampadjustment left• Eliminate blockage or seizing• Adjust transport clamp p. 3602506 Error step motor transport clampadjustment right at mechanicalstop• Adjust stop• Change correction values2522 Step motor transport clamp leftpulse-wheel search time out• Check connection cables motor /encoder• Check step motor for stiffmovement2530 Step motor quick clamp adjust-ment left not responding: Stepmotor card defective• Perform software update p. 431• Replace step motor card• Replace controlError code Symbol Meaning Remedial action
