Publicidad
Troubleshooting
f
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 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
case and shuttle.
2. Lint has collected in the shuttle area.
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. The needle thread is not threaded properly.
5. The wrong needle is used.
Page 28
Pages 30, 32
Page 18
Page 18
Page 28
Page 36
Page 77
Page 26
Page 70
Changethe
bobbin
Page 18
Page 18
Page 18
Pages 30, 32
Page 36
Page 77
Page 18
Page 18
Page 77
Page 28
Changethe
needle
Seam puckering
1. The needle thread tension is too tight.
Pages 30, 32
2. The needle thread is not threaded properly.
Page 28
3. The needle is too heavy for the fabric being sewn.
Page 77
4. The stitch length is too long for the fabric.
Make stitch denser
The cloth is not
1. The feed dog is packed with lint.
Page 68
feeding
smoothly.
2. The stitches are too fine.
Make stitch coarser
3. The feed dog is not raised after "drop feed" sewing.
Page 42
The machine
1. The machine is not plugged in.
Page 14
doesn't work.
2. A thread is caught in the shuttle race.
Page 70
3. Push-clutch is disengaged.
Pages 22, 24
Patterns are
1. The stitch is not balanced.
Page 34
distorted.
Noisy operation
1. There is thread caught in the hook race.
2. Lint has built up in the shuttle or the shuttle race.
Page 70
Page 70
74
Publicidad
