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Trouble Cause (1) Cause (2) Check and corrective measures
From the previous page
5-3) The thread take-up spring is
inappropriately adjusted.
3-A) The stroke of the thread take-up
spring is too long or too small.
Adjust the stroke of the thread take-up spring.
3-B) The tension of the thread take-
up spring is too high or too low.
Adjust the tension of the thread take-up spring.
3-C) The tension of the thread take-
up spring is too high or too low.
For the A-type thread tension, replace the cur-
rent thread take-up spring with a standard type
spring. (for a #60 or thicker thread)
5-4) The needle is defective. 4-A) The needle is bent. Replace the needle.
4-B) The needle has a aw. Replace the needle.
4-C) The needle tip is blunt. Replace the needle.
4-D) The needle mounting direction
is inappropriate.
Mount the needle appropriately. Defective sew-
ing is likely to occur when the needle recess
portion faces frontward.
4-E) The needle is too thin or thick
for the thread to be used.
Replace the needle.
4-F) The needle tip is too sharp. Use a ballpoint needle.
5-5) The matters related to the
hook are inappropriate.
5-A) The thread path of the hook has
a aw.
Replace the needle.
5-B) The blade top of the hook is
blunt or worn.
Sharpen the blade top of the hook or replace
the needle.
5-C) The clearance between the
hook and inner hook presser is
too small.
Increase the clearance to smooth the thread
passing.
5-D) Hook oil is insufcient. Adjust the hook oil volume to the appropriate
level.
5-E) The thread path of the hook has
a aw.
Replace the needle.
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