29
Troubles and Corrective Measures
If sewing difficulties 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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24
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.
17-19
22
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24
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.
22
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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.
24
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Stitches are
puckered.
1. The presser foot applies too much pressure
to the material.
2. The tension of the needle thread is not
balanced with that of the bobbin thread.
3. When the combination of the needle and the
thread is improper.
4. The needle is too thick for the material.
· Decrease the pressure of the presser foot.
· Balance the tension.
· Properly correct the combination of needle and
the thread.
· Replace the needle by the one suited to the
material.
12
22
23
23
Stitch performance
is bad.
1. The tension of the needle thread is not
balanced with that of the bobbin thread.
· Balance the tensions.
22
The rotation noise
is too heavy or too
high.
1. Dust accumulates in the feed dog
2. The oil in the machine has run out due to a
long period of usage.
3. The oil other than the exclusive sewing
machine oil is used.
4. Thread wastes accumulate in the hook.
· Carry out maintenance of your sewing machine.
· Carry out maintenance of your sewing machine.
· Apply the proper sewing machine oil.
· Clean up the sewing machine.
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27
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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 material
cannot be fed.
1. The stitch length is set “0”.
2. Drop-feed knob is set to “NOT FEED”.
3. The pressure of the presser foot is too low.
· Set the stitch length to an appropriate amount.
· Set the drop-feed knob to “FEED”.
· Turn the presser foot pressure regulator to in
crease the pressure properly.
11
12
12
Needle threading
cannot be
performed.
1. When the needle has not been raised.
2. When the needle has not been inserted until
it can go no further at the time of attaching
the needle.
3. When the sewing machine has been turned
with the needle threader lever lowered (during
threading) by mistake.
· Turn the handwheel or press the needle
up/down switch to bring the needle to its
highest position.
· Attach the needle properly.
· Slightly turn the handwheel by hand to the
opposite side (opposite to the direction at the
time of sewing).
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