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27 –
Troubles and Corrective Measures
If sewing difculties occur, make sure the instructions are correctly followed. If a problem still exists, the reminders below
help to solve it.
Troubles Case Corrective measures Page
Stitches are
skipped.
1. The needle is bent or the needle point
is blunted.
2. The needle has not been attached to
the needle bar properly.
· Replace the needle.
· Attach the needle properly to the needle bar.
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26
Needle thread
breaks.
1. The machine head has been threaded
incorrectly.
2. The needle thread tension is too high
or low.
3. The needle is bent or the needle point
is blunted.
4. The needle is not suited to the thread
used.
· Correct the threading.
· Properly adjust the thread tension.
· Replace the needle.
· Replace the needle by the one suited to the
thread used.
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24
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26
The bobbin
thread breaks.
1. The bobbin thread tension is too high.
2. The rubbing of the bobbin case spring
has produced a slot.
3. Scratches on the needle hole in the
throat plate.
· Decrease the tension.
· Replace the bobbin case.
· Replace the throat plate.
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The needle
breaks.
1. The needle is bent or has been
installed improperly.
2. The needle hits the throat plate or the
presser foot.
· Replace or correctly attach the needle.
· Correctly position the needle, throat plate, or
presser foot.
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Stitches are
puckered.
1. The tension of the needle thread is
not balanced with that of the bobbin
thread.
2. When the combination of the needle
and the thread is improper.
3. The needle is too thick for the material.
· Balance the tension.
· Properly correct the combination of needle
and the thread.
· Replace the needle by the one suited to the
material.
24
25
25
Stitch
performance
is bad.
1. The tension of the needle thread is
not balanced with that of the bobbin
thread.
· Balance the tensions. 24
The rotation noise
is too heavy or
too high.
1. Thread wastes accumulate in the
hook.
· Clean up the sewing machine. 27
The handwheel
does not rotate
smoothly or does
not turn.
1. The thread is entangled and caught in
the hook.
· Lubricate the hook, strongly turn the
handwheel clockwise and counterclockwise
several times, then remove the thread
caught in the hook.
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The sewing
machine cannot
perform sewing at
the beginning of
sewing.
1. Remaining length of thread is shorter.
2. Back tacking has not been carried out.
· Loosen the tension controller No. 1 (turn to
the left) to increase the remaining length of
thread after automatic thread trimming.
· Draw thread through the needle eyelet to
adjust the remaining length of thread to
approximately 5 cm.
· Be sure to carry out back tacking by several
stitches at the beginning of sewing.
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