1. The needle is bent or the needle point is blunted.
2. The needle has not been attached to the needle
bar properly.
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.
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.
1. The needle is bent or has been installed
improperly.
2. The needle hits the throat plate or the presser foot.
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.
1. The tension of the needle thread is not balanced
with that of the bobbin thread.
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.
1. The thread is entangled and caught in the hook.
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.
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.
30
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.
Needle thread
breaks.
The bobbin thread
breaks.
The needle breaks.
Stitches are
puckered.
Stitch performance
is bad.
The rotation noise
is too heavy or too
high.
The handwheel
does not rotate
smoothly or does
not turn.
The material
cannot be fed.
Needle threading
cannot be
performed.
· Replace the needle.
· Attach the needle properly to the needle bar.
· Correct the threading.
· Properly adjust the thread tension.
· Replace the needle.
· Replace the needle by the one suited to the thread
used.
· Decrease the tension.
· Replace the bobbin case.
· Replace the throat plate.
· Replace or correctly attach the needle.
· Correctly position the needle, throat plate, or
presser foot.
· 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.
· Balance the tensions.
· 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.
· Lubricate the hook, strongly turn the handwheel
clockwise and counterclockwise several times,
then remove the thread caught in the hook.
· Set the stitch length to an appropriate amount.
· Set the drop-feed knob to “FEED”.
· Turn the presser foot pressure regulator to increase
the pressure properly.
· 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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