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Troubleshooting
Condition Cause Reference
The needle 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 is not set under the presser foot when start sewing.
6. The fabric is moved too fast when stitching free motion quilting.
7. The thread is tangled around the spool.
Page 22-23
Page 27
Change the needle.
Page 17
Page 37
Page 78
Use the spool holder.
The bobbin thread
breaks
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.
Page 21
Page 99
Change the bobbin.
The needle breaks 1. The needle is incorrectly inserted.
2. The needle is bent.
3. The needle clamp screw is loose.
4. The fabric is pulled forward when using the open-toe foot.
5. The needle is too fine for the fabric being used.
6. An inappropriate presser foot is used.
Page 17
Change the needle.
Page 17
Page 77
Page 17
Use the correct foot.
Skipped stitches 1. The needle is incorrectly inserted, bent or blunt.
2. The needle and/or threads are not suitable for the work being sewn.
3. A blue tip needle is not being used for sewing stretch, very fine fabrics
and synthetics.
4. The needle thread is not threaded properly.
5. A poor quality needle is used.
6. A purple tip needle is not being used for sewing thick fabrics, denims
and across the hem.
Page 17
Page 17
Use the stretch stitch
needle.
Page 22-23
Change the needle.
Page 17
Seam puckering 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.
5. The foot pressure is not adjusted properly.
6. A stabilizer is not used when sewing very fine fabrics.
Page 27
Page 22-23
Page 17
Make stitch shorter.
Page 15
Apply a stabilizer.
The fabric is not
feeding smoothly
1. The feed dog is packed with lint.
2. The stitches are too fine.
3. The feed dog is not raised after ”drop feed” sewing.
Page 99
Make stitch longer.
Page 28
Loops on the seams 1. The needle thread tension is too loose.
2. The needle is too thick or too fine for the fabric.
Page 27
Page 17
The machine does
not run
1. The machine is not plugged in.
2. Thread has been caught in the hook race.
3. The start/stop key is used for ordinary sewing with the foot control
plugged in.
Page 8
Page 99
Page 8
Buttonhole sewing
is not sewn properly
1. The stitch density is not suitable for the fabric being sewn.
2. The interfacing has not been used for the stretch or synthetic fabric.
3. The buttonhole lever is not lowered.
Page 61
Apply an interfacing.
Page 59
The machine is
noisy
1. Thread has been caught in the hook race.
2. Lint has built up in the hook race or bobbin holder.
Page 99
Page 99
Auto thread cutting
failed
1. Thread is too thick for the auto thread cutting.
2. Threads have been caught in the thread cutter mechanism.
Page 10
Page 99
The needle thread
appears on the
wrong side of the
fabric when the
stitch width value
is larger than “7.0”.
1. Thread tension is not balanced. Page 27
It is not abnormal for a faint humming sound to be heard from the internal motors.
The LCD screen and function key area may become warm after several hours of continuous use.
104


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