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Frequent skip stitching
happens.
Trimming is not
functioned.
Needle thread is
pulled from needle
hole after trimming
Stitch forming is loose.
Clearance between needle
and hook is too big.
Timing of needle and hook is
not proper.
Contact between needle and
driver is too tight.
Needle is bent.
Needle is at wrong position.
Presser foot position is not
proper.
Presser foot up and down
timing is not proper.
Fixed knife is dull.
Movable knife is dull.
Movable knife home position
is not proper.
Skip stitching happens in
trimming.
Setting of trimming timing is
not proper
Trimming setting is off.
Thread release timing is not
proper.
Threading way of the needle
thread is not proper.
Pre-tensioner spring is too
tight. (Thread tail is short.)
Upper thread tension is too
loose.
Bobbin thread tension is too
loose.
Strength of thread take up
spring is inadequate.
Adjust clearance between
needle and hook properly.
Adjust position of needle and
hook properly.
Adjust clearance between
needle and driver properly.
Change needle.
Fix position properly.
Adjust presser foot position.
Adjust presser foot up and
down properly.
Sharpen fixed knife or change
fixed knife.
Sharpen Movable knife or
change fixed knife.
Adjust movable knife home
position.
Refer to the condition
"Frequent skip stitching
happens".
Adjust the trimming timing.
Turn trimming setting on.
Adjust the thread release
timing.
Thread the needle thread
properly.
Adjust the intensity of the pre-
tensioner spring.
Adjust upper thread tension.
Adjust bobbin thread tension.
Adjust strength of thread take
up spring.
- 51 -
6-2-3
6-2-6
6-2-4
5-1
5-1
6-4
6-4
-
-
7-5-1
-
Operation
panel
section
Operation
panel
section
Operation
panel
section
5-2
6-7
5-10
5-9
6-6-2
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