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Troubleshooting
Condition
The fabric is not
being fed
smoothly.
The needle
breaks.
The thread
breaks.
Skipped stitches
The seam is not
sewn neatly.
Seam puckering
The machine
does
not operate.
The fabric is not
cut neatly.
1. The feed dog is packed with lint.
2. The presser foot has been raised.
1. The needle is incorrectly inserted.
2. The needle is bent or blunt.
3. The fabric is pulled strongly.
1. The machine is not correctly threaded.
2. The needle or looper thread tension is too tight.
3. The needle is incorrectly inserted.
4. The needle is bent or blunt.
1. The needle is bent or blunt.
2. The machine is not correctly threaded.
3. The needle is incorrectly inserted.
1. The needle and/or looper thread tensions are
not correctly adjusted.
2. The machine is not correctly threaded.
3. The stitch is not suitable for the fabric being
sewn.
4. The thread is not between the tension discs.
1. The needle or looper thread tension is too tight.
2. The machine is not correctly threaded.
3. The differential feed dial is not correctly
adjusted.
1. The machine has not been plugged in firmly.
2. The power switch is turned off.
1. The position of the upper knife is not adjusted
properly.
2. The upper knife is dull.
Cause
80
Reference
See page 74.
Lower the presser foot.
See page 20.
Replace the needle.
Pull the fabric lightly.
See pages 34-56.
See pages 64-70.
See page 20.
Replace the needle.
Replace the needle.
See pages 34-56.
See page 20.
See pages 62-70.
See pages 34-56.
See pages 22-24.
See pages 38, 44, 48 and 54.
See pages 64-70.
See pages 34-56.
See page 26.
See page 12.
See page 12.
See page 74.
Replace the upper knife.
(See page 74.)
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