Troubleshooting
Condition
The needle thread breaks.
The bobbin thread breaks.
The needle breaks.
Skipped stitches
Seam puckering
The cloth is not feeding smoothly.
The machine doesn't work.
Patterns are distorted.
Noisy operation
Cause
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 at the start of sewing.
6.The threads were not drawn to the rear after the previous use.
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 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 threads were not drawn to the rear after the previous use.
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.A blue needle is not being used for sewing stretch, very fine fabrics and synthetics.
5.The needle thread is not threaded properly.
6.The wrong 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.
1.The stitches are too fine.
2.The feed dog is not raised after “drop feed” sewing.
3.The feed dog is packed with lint.
1.The machine is not plugged in.
2.A thread is caught in the shuttle race.
3.The
1. The stitch is not balanced.
1.There is thread caught in the hook race.
2.Lint has built up in the shuttle or the shuttle race.
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Reference
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Pages 28, 30
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Page 84
Change the bobbin
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Pages 28, 30
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Page 26
Page 10
Pages 28, 30
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Pages 28, 30
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Page 84
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