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47
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.
Cause
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.
Reference
See page 45.
Lower the presser foot.
See page 15.
Replace the needle.
Pull the fabric lightly.
See pages 21-31.
See pages 35-42.
See page 15.
Replace the needle.
Replace the needle.
See pages 21-31.
See page 15.
See pages 35-42.
See pages 21-31.
See pages 11-13.
See pages 23, 26, 28 and 31.
See pages 35-42.
See pages 21-31.
See page 14.
See page 6.
See page 6.
See page 44.
Replace the upper knife.
(See page 44.)
49


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