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- Starting to stitch too fast.
- Improper threading.
- Top thread tension too high.
- Incorrect setting of needle.
- Wrong needles and thread for the fabric.
Breaking upper
thread
- Set thread pool and the position
indentation at left side.
- Incorrect setting of bobbin case.
- Needle eye is sharp.
- Burrs on bobbin.
- Burrs on needle hole.
Breaking bobbin
- Down thread improper threading.
thread
- Down thread tension too high.
- Lint in bobbin or shuttle.
- Stitch length in "O" position.
Fabric not
- Scraps seize-up with feet-dog
moving
- Sewing thread integral convexity
- Didn't use the special-purpose bobbin.
Machine
jamming
- Thread caught in shuttle.
knocking noise
Sewing machine
- The machine is not plugged in.
doesn't operate
- Machine is not turned on.
Down thread is
- Top thread tension too high.
pulled above the
- Upper thread improper threading.
cloth.
- Down thread improper threading.
- Start to stitch at a medium speed.
- Re-thread. See page 12
- Adjust top thread tension. See page 15
- Re-set needle. See page 6
- Choose correct needle and thread to suit the
fabric. See page 17
- Adjust position of the indentation to right side.
See page 8、 、 、 、 9
- Re-set bobbin case. See page 34
- Replace new needle.
- Sand or change bobbin case.
- Sand or change needle plate.
- Re-thread. See page 10、 、 、 、 11
- Adjust down thread tension. See page 15
- Clean bobbin case and shuttle. See page 34
- Adjust stitch length.
- Clean feed dog. See page 34
- Pull back upper and down threads under of
presser foot.
- Replace special-purpose bobbin.
- Remove and clean shuttle. See page 34
- See page 5
- See page 5
- Adjust top thread tension. See page 15
- Re-thread. See page 12
- Re-thread. See page 10、 、 、 、 11
- 37 -
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