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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 20
Page 43
Change the needle.
Page 23
Page 34
Page 102
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 19
Pa ge 112
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 needle is too ne for the fabric being used.
5. An inappropriate presser foot is used.
Page 23
Change the needle.
Page 23
Page 24
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 ne 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 23
Page 24
Use the stretch stitch
needle.
Page 20
Change the needle.
Page 24
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 ne fabrics.
Page 43
Page 20
Page 24
Make stitch shorter.
Page 43
Apply a stabilizer.
The fabric is not
feeding smoothly
1. The feed dog is packed with lint.
2. The stitches are too ne.
3. The feed dog is not raised after ”drop feed” sewing.
Pa ge 112
Make stitch longer.
Page 29
Loops on the seams 1. The needle thread tension is too loose.
2. The needle is too thick or too ne for the fabric.
Page 43
Page 24
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 button is used for ordinary sewing with the foot control
plugged in.
Pa ge 11-12
Pa ge 112
Page 12
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 51
Apply an interfacing.
Page 49
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.
Pa ge 112
Pa ge 112
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 15
Pa ge 112
Pattern selection
keys are grayed out.
1. The needle plate for straight stitch or the professional grade needle
plate is attached to the machine.
2. Dual feed key is on.
3. Twin needle key is on.
Page 28
Page 37
Page 70
Pattern selection
keys do not work
1. The key position is out of alignment. Page 106
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 43
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.
117


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