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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
From the previous page
4-6) Finish of the needle hole is rough. Replace the needle.
4-7)
Thread take-up spring is maladjusted.
7-A) Stroke of the thread take-up spring is too large. Properly adjust the thread take-up spring.
7-B) Thread take-up spring tension is too high. Properly adjust the thread take-up spring.
4-8) Rotation of the inner hook is defective. 8-A) Race face of the shuttle is clogged with thread
waste.
Remove the inner hook and remove the thread
waste.
8-B) Oil amount is insufcient. Supply oil to the shuttle components.
4-9) Needle thread clamp OFF 9-A) Needle thread length is inadequate. Adjust the needle thread length and turn the
needle thread clamp ON.
5. Thread breakage at the
time of thread trimming
5-1) Thread release timing is defective. 1-A) Floating amount of the thread tension disk No. 2 is
small.
Adjust the amount of thread tension No. 2 oat-
ing.
5-2) Thread spreading section of the mov-
ing knife has scratches.
Paying attention to the blade section, polish with
polishing powder.
5-3) Shuttle upper spring has scratches. Remove the scratches.
5-4) Level difference between the needle
hole guide and the counter knife is too
high.
4-A) Thread is cut before trimming with the blade section
of the moving knife.
Properly adjust the position of counter knife.
5-5) Clearance between the needle hole
guide and the counter knife is too
small.
5-A) Thread is cut before trimming with the blade section
of the moving knife.
Properly adjust the position of counter knife.
5-6) Lower face of the needle hole guide
has scratches.
6-A) Thread is cut with the needle hole guide. Remove the scratches and polish with buff, or
replace the needle hole guide.
5-7) Thread spreading timing of the moving
knife is defective.
Adjust initial positions of the thread trimmer/
work clamp foot origin sensor and the moving
knife.
5-8) Thread take-up spring tension is too
low.
Adjust the thread take-up spring.
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