Troubleshooting
468 Service Instructions 755 A/756 A - 00.0 - 02/2019
9720 Error during flap scanning with
light barrier
• Check reflecting foil
• Check alignment of the light
barriers
9721 Flap has been positioned in front
of the front positioning point
Insert the flap correctly
9722 Flap projects beyond the maxi-
mum sewing area (behind the
rear positioning point)
• Check flap size
• Insert the flap correctly
9723 Fluff at the flap beginning • Insert flaps with smooth edges
• Check reflecting foil
9725 • Flap angle too great
• Flap too small
• Check flap angle
• Check alignment of the light
barriers
• Adjust seam parameters (seam
securement possibly too long for
small flaps)
9726 • Flap too large
• Reflecting foil dirty/damaged
• Check flap size
• Check reflecting foil
9727 Stop section insufficient for the
flap angle
Reduce the insertion speed
 p. 330
9728 Flap too small Check the flap size; insert a larger
flap
9730 Corner knife cut impossible • Increase seam length
• Change positioning point
9800 Middle knife not ready for use Check cable
9810 Outfeed roller not ready for use Check cable
9900 Defective machine parameters
(Checksum error)
• Initialize machine parameters
again
9901 Defective pocket sequence
(checksum error)
• Initialize pocket sequences again
9902 Defective pocket programs
(Checksum error)
• Initialize pocket programs again
9920 Serial number active
9921 Serial number not accepted Re-enter serial number
9999 Machine configuration has been
changed
Switch off and on the machine again
Error code Symbol Meaning Remedial action
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