– 138 –
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
11.
Long needle thread at the
start of sewing remains
on the wrong side of ma-
terial. (LK-1900BB/BNB
)
11-1)
Sharpness of the knife is defective. 1-A) Worn-out of the counter knife. Replace the counter knife.
11-2)
Stitch length of sewing start is long.
Make stitch length of sewing start (up to three
stitches) shorter. (Refer to handling of a needle
of bird's nest and shorter thread remaining.)
12. Long needle thread
at the end of sewing
remains. (LK-1900BB/
BNB, 1903BB/BNB)
12-1
) Sharpness of the knife is defective. 1-A) Worn-out of the moving and counter knives. Replace the moving and counter knives.
1-B) Engagement of the moving and counter knives is
defective.
Properly adjust the height and position of the
moving and counter knives.
13. Thread waste remains
around the hook. (LK-
1900BB/BNB, 1903BB/
BNB)
13-1)
Position of the suction nozzle is inap-
propriate.
Adjust the position of the suction nozzle.
13-2)
Thread waste is jammed in the dust
back or in its route.
Cleaning the dust back, carry out air-blow to
the tube in the pathway.
14. Many needle threads
protrudes on the wrong
side of material at button
sewing. (LK-1903BB/
BNB)
14-1)
The height of the cloth presser bar of
the button clamp unit is too low.
Increase the height of the cloth presser bar. (Fix
the cloth presser bar in the state of pressing it
against the button guide foot.)
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