Troubleshooting
452 Service Instructions 755 A/756 A - 00.0 - 02/2019
1002 Sewing motor insulation fault • Check motor phase and PE for
low-impedance connection
• Replace sewing motor encoder
• Replace sewing motor
1004 Sewing motor error: Incorrect
direction of rotation
• Replace encoder
• Check plug assignment and
change, if necessary
• Check wiring in machine
distributor and change it, if
necessary
• Test motor phases and check for
correct value
1005 • Sewing motor blocked
• Encoder cable not connected
• Encoder cable defective
• Encoder defective
• Remove blockage
• Check encoder cable and replace,
if necessary
• Replace sewing motor
1006 • Sewing motor error: Maximum
speed exceeded
• Sewing motor cable defective
• Sewing motor defective
• Switch off and on the machine
again
•Check class
• Replace encoder
• Replace sewing motor
1007 Error in the reference run • Replace encoder
• Eliminate stiff movement in the
sewing machine
1008 Fault in sewing motor encoder Replace encoder
1010 • Cable to sewing motor refer-
ence switch defective
• Reference switch defective
• Replace cable
• Replace reference switch
(part number 9815 935006)
1011 Sewing motor synchronization
error (encoder Z pulse missing)
Switch off the control, use hand-
wheel to turn, and switch on the
control again.
If error is not corrected, check
encoder
1012 Sewing motor synchronization
error
Replace synchronizer
1051 Sewing motor timeout
• Cable to sewing motor refer-
ence switch defective
• Machine head not moving
freely
• excessively high toothed belt
tension
• Replace cable
• Replace reference switch
• Eliminate seizing
• Check toothed belt tension
1052 Sewing motor excess current,
internal current increase to over
25 A
• Replace sewing motor cable
• Replace encoder
• Replace sewing motor
• Replace control
Error code Symbol Meaning Remedial action
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