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6-2) The timing of the hook is too late. 2-A) Late hook timing excessively Conduct hook adjustment 0.2 to 0.5 mm earlier than the
enlarges and deforms the needle lower marker line of the needle bar.
thread loop, and accordingly,
the thread is caught twice with Wind the thread around the needle.
the blade top resulting in thread
breakage.
6-3) The thread take-up spring is 3-A) The stroke of the thread take-up Adjust the stroke of the thread take-up spring.
inappropriately adjusted. spring is too long or too small.
3-B) The tension of the thread take-up Adjust the tension of the thread take-up spring.
spring is too high or too low.
3-C) Spring selection for the thread For the A-type thread tension, replace the current thread
to be used is inappropriate. take-up spring with a standard type spring.
(for a #60 or thicker thread)
7. Thread breakage at needle entry or idle 7-1) Same as [6. Thread breakage at 1-A) Same as [6. Thread breakage Same as [6. Thread breakage at back or back-tuck sewing].
stitching back or back-tuck sewing] at back or back-tuck sewing]
7-2) The position of the knife thread Make an adjustment so that the needle comes to the hole center.
guide is inappropriate.
7-3) The position of the needle bar is Lift the position of the needle bar.
too low.
8. Seam swinging 8-1) The tension of the needle thread Reduce the tension of the needle thread.
is too high.
8-2) The needle is defective. 2-A) The needle is bent. Replace the needle.
2-B) The needle tip is blunt. Replace the needle.
2-C) Needle is too thin. Use a thicker needle. For a KN needle (single needle), use
a double needle.
2-D) The needle is too long. Use a shorter needle or a needle with longer shank (DA x 1)
8-3) The sewing speed is too high. Reduce the sewing speed.
Trouble Case (1) Case (2) Check and Corrective measures
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