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Janome 521 Sewist Manual

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72
Condition
Cause
Reference
The needle breaks.
Skipped stitches
Seam puckering
The cloth is not fed
smoothly.
The needle thread
breaks.
The bobbin thread
breaks.
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
drawn to the rear and set properly under the presser
foot when starting sewing.
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 does not turn smoothly.
4. The thread is wound loosely on the bobbin.
1. Needle is incorrectly inserted.
2. The needle is bent or blunt.
3. The needle clamp screw is loose.
4. A proper foot is not used.
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 thread are not suitable for the
fabric being sewn.
4. A blue tip needle is not used for sewing stretch, very
fine fabrics and synthetics.
5. The needle thread is not threaded properly.
6. A poor quality needle is used.
1. The needle thread tension is too tight.
2. The needle thread is not threaded properly.
3. The needle is too heavy for the fabric being sewn.
4. The stitch length is too long for the fabric.
* Use a stabilizer for very fine fabrics.
1. The feed dog is packed with lint.
2. The stitches are too fine.
3. The feed dog was not raised after being lowered.
4. The foot pressure is not adjusted properly.
Page 26
Page 34
Page 16
Page 16
Page 36
Page 36
Page 16
Page 24
Page 68
Replace the bobbin
Re-wind the bobbin.
Page 16
Page 16
Page 16
Use proper foot.
Page 36
Page 16
Page 16
Page 16
Page 16
Page 16
Page 26
Replace the needle
Page 34
Page 24
Page 16
Make stitch shorter
Page 68
Make stitch longer
Page 12
Page 12
The buttonhole is not
sewn well.
The machine does not
work.
Patterns are distorted.
1. The machine is not plugged in.
2. Thread is caught in the hook race.
3. The handwheel is pulled for bobbin winding.
1. The stitch is not balanced.
1. The stitch density is not suitable for the fabric being
sewn.
Page 10
Page 68
Page 22
Page 32
Page 48
Troubleshooting
The needle thread
loops.
1. The needle thread tension is too loose.
2. The needle size is not suitable for the thread.
Page 13
Page 16
Noisy operation
1. The feed dog is packed with lint.
2. Lint has collected in the bobbin holder.
Page 68
Page 68
Layer slippage
1. The foot pressure is not adjusted properly. Page 12
… 76 …


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