SECTION
5. PERFORMANCE
PROBLEMS
CHART
Troubleshooting
Condition
Cause
Reference
The fabric is not
1 The feed dog is packed with lint
Page 86,
being fed smoothly.
2 The presser foot has been raised
Lower the presser foot,
The needle breaks.
1 The needle is incorrectly inserted
Page 60_
2 The needle is bent or blunt
Page 60.
3 The fabric is forcefully
pulled,
Pull the fabric lightly
The thread breaks.
1 The machine is not correctly threaded
Pages 20-36 and 50.
2 The needle or looper thread tension is too tight
Pages 44-54 and 68-84
3 The needle is incorrectly
inserted
Page 60
4 The needle is bent or blunt.
Page 60
Skipped
stitches,
1 The machine is not correctly threaded
Pages 20-36 and 50.
2 The needle is bent or blunt
Page 60,
The seam is not
1 The needle and/or looper thread tensions are not correctly
F_ages44-54 and 68-84
sewn neatly,
ajusted
2 The machine is not correctly threaded
Pages 20-36 and 50
3_ The needle and/or the thread are not suitable for the fabric
being sewn.
Page 66
4, The thread ls not between
the tension discs,
Pages 22-36,
Seam puckering.
1, The needle or looper thread tension is too tight
Pages 44-54 and 68-84
2, The machine is net correctly threaded,
Pages 20-36 and 50
3 The needle plate is not suitable for the use
Page 64
4 The differential feed dial is not set at the proper position,
Page 56
The machine
does
1. The machine has not been plugged in firmly
Page !4
not operate,
2, The power switch is turned off
Page 14
J
94
