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WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.
Trouble Cause (1) Cause (2) Check and corrective measures
7. Poorly tense stitches 7-1) Tension controller No. 2 is maladjust-
ed.
1-A) Tension of the tension controller No. 2 is low. Properly adjust the tension of tension controller
No. 2.
7-2) Tension controller No. 2 is oating.
Adjust the thread tension releasing mechanism.
7-3)
Thread take-up spring is maladjusted.
Adjust thread take-up spring tension and stroke.
7-4) Clearance between the inner hook
and the shuttle driver is defective.
4-A) The clearance between the inner hook and the
shuttle driver is too small.
Properly adjust the clearance of inner hook and
shuttle driver.
7-5) Selection of the needle to be used is
improper.
5-A) Needle to be used is thin. Replace the needle with a thicker one.
7-6) Selection of the needle hole guide is
improper.
6-A) Hole diameter of the needle hole guide to the nee-
dle to be used and thread is small.
Replace the needle hole guide with a new one
having a larger needle hole.
7-7) Shape of the feed plate is defective. 7-A) Material to be sewn is stiff and closely contacted
with the throat plate, and there is no clearance be-
tween them to pass the thread.
Raise the material to be sewn by means of the
feed plate.
7-B) Material to be sewn is highly elastic and closely
contacted with the throat plate, and there is no
clearance between them to pass the thread.
Raise the material to be sewn by means of the
feed plate.
7-8) Feed timing is defective. 8-A) Feed timing is too fast.
Use the memory switch to change the feed timing.
8. Defective stitches with
the synthetic thread
8-1) Thread breakage due to heat 1-A) The sewing speed is too fast. Slow down the maximum speed.
1-B) The needle used is too thick. Use a thin needle or a super needle for the
synthetic thread.
Use silicon.
Use a needle cooler.
8-2) Hangnail of thread 2-A) Thread path is defective. Polish the thread path of each component with
polishing powder.
2-B) Finish of the needle hole is defective. Replace the needle.
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