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Troubleshooting
Condition
The needle thread
breaks.
The bobbin thread
breaks.
The needle breaks.
Skipped stitches
Cause Reference
1. The needle thread is not threaded properly.
2. The needle thread tension is too tight.
3. The needle is bent or blunt.
4. The needle is incorrectly inserted.
5. The needle thread and the bobbin thread are not set
properly under (drawn to the rear of) the presser foot
when sewing is starting.
6. The fabric is not drawn to the rear when sewing is
finished.
7. The :thread is too heavy or too fine for the needle.
1. The bobbin thread is not threaded properly in the
bobbin holder.
2. Lint has collected in the bobbin holder.
3. The bobbin is damaged and doesn't turn smoothly.
1. The needle is incorrectly inserted.
2. The needle is bent or blunt.
3. The needle clamp screw is loose.
4. The needle thread tension is too tight.
5. The fabric is not drawn to the rear when sewing is
finished.
6. The needle is too fine for the fabric being sewn.
1. The needle is incorrectly inserted.
2. The needle is bent or blunt.
3. The needle and/or threads are not suitable for the work
being sewn.
4. A blue needle is not being used for sewing stretch, very
fine fabrics and synthetics.
5. The needle thread is not threaded properly.
6. The presser foot pressure is not strong enough.
7. The wrong needle is used.
Page 26
Pages28,30
Page10
Page10
Page 26
Page 38
Page 16
Page 24
Page 90, 92
Changethe bobbin
Page 10
Page10
Page10
Pages 28, 30
Page 38
Page16
Page10
Page10
Page16
Page16
Page 26
Page 8
Changethe needle
Seam puckering 1. The needle thread tension is too tight. Pages 28, 30
2. The needle thread is not threaded properly. Page 26
3. The needle is too heavy for the fabric being sewn. Page 16
4. The stitch length is too long for the fabric. Make stitch denser
5. The presser foot pressure is net correctly adjusted. Page 8
The cloth is not 1. The feed dog is packed with lint. Page 92
feeding smoothly. 2. The presser foot pressure is too weak. Page 8
3. The stitches are too fine. Make stitch coaser
4. The feed dog was not raised after "drop feed" was used. Page 46
The machine 1. The machine is not plugged in. Page 6
doesn't work. 2. A thread is caught in the hook race. Page 90, 92
3. Push-pull clutch is disengaged. Page 22
Patterns are dis- 1. The stitch is not balanced. Page 36
torted.
Noisy operation 1. There is thread caught in the hook race. Page 90, 92
2. Lint has built up in the bobbin holder or hook race. Page 90, 92
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94