JUKI LK-1900AN, Руководство инженера, Страница: 117 / 140

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Trouble Cause (1) Cause (2) Check and corrective measures
From the previous page
8-4) Stitch skipping due to the
heat
4-A) Sewing speed is too fast. Change the maximum speed (electrical
components.)
4-B) Needle is too thin. Use a thicker needle. (Raise the number of
needle to be used.)
4-C) Loop of the needle thread falls
down.
Attach the needle with the long groove ori-
enting slightly to the right (approximately 20°).
Use a needle cooler.
8-5) Uneven stitch tightness
due to the stretch of thread
5-A) Sewing speed is too fast. Reduce the speed by means of the speed
variable resistor.
5-B) Tension of the thread tension No.
2 asm. is excessive.
Decrease the tension of tension controller
No. 2.
9. Thread chips generated in the
shuttle
9-1) Long needle thread at the
beginning of stitches
1-A) The thread trimmer is used for
cutting.
Needle thread clamp OFF
Adjust the needle thread length to 32 to 36
mm.
Increase the sewing length to more than 10
mm.
10. Roll-in malfunction of remaining
thread at underside material.
10-1) Protrusion of needle thread 1-A) Material does not keep close
contact with the needle plate.
Change the feed plate.
1-B) Stitch size is short. Increase the sewing size to more than 10
mm.
1-C) The needle thread is long. Adjust the needle thread length to 32 to 36
mm.