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Troubleshooting
Condition
Cause
The needle thread
1. The needle thread is not threaded properly.
breaks
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.
The bobbin thread
1. The bobbin thread is not threaded properly in the bobbin holder.
breaks
2. Lint has collected in the bobbin holder.
3. The bobbin is damaged and does not turn smoothly.
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 fine for the fabric being used.
5. An inappropriate presser foot is used.
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
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
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.
The fabric is not
1. The feed dog is packed with lint.
feeding smoothly
2. The stitches are too fine.
3. The feed dog is not raised after "drop feed" sewing.
Loops on the seams 1. The needle thread tension is too loose.
2. The needle is too thick or too fine for the fabric.
The machine does
1. The machine is not plugged in.
not run
2. Thread has been caught in the hook race.
3. The start/stop button is used for ordinary sewing with the foot control
Buttonhole sewing
1. The stitch density is not suitable for the fabric being sewn.
is not sewn properly
2. The interfacing has not been used for the stretch or synthetic fabric.
3. The buttonhole lever is not lowered.
The machine is
1. Thread has been caught in the hook race.
noisy
2. Lint has built up in the hook race or bobbin holder.
Auto thread cutting
1. Thread is too thick for the auto thread cutting.
failed
2. Threads have been caught in the thread cutter mechanism.
Pattern selection
1. The needle plate for straight stitch is attached to the machine.
keys are grayed out.
2. Dual feed key is on.
3. Twin needle key is on.
Pattern selection
1. The key position is out of alignment.
keys do not work
The needle thread
1. Thread tension is not balanced.
appears on the
wrong side of the
fabric when the
stitch width value
is larger than "7.0".
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.
and synthetics.
and across the hem.
plugged in.
96
Reference
Page 13
Page 33
Change the needle.
Page 16
Page 26
Page 84
Use the spool holder.
Page 12
Page 93
Change the bobbin.
Page 16
Change the needle.
Page 16
Page 16
Use the correct foot.
Page 16
Page 16
Use the stretch stitch
needle.
Page 13
Change the needle.
Page 16
Page 33
Page 13
Page 16
Make stitch shorter.
Page 33
Apply a stabilizer.
Page 93
Make stitch longer.
Page 22
Page 33
Page 16
Page 6
Page 93
Page 6
Page 40
Apply an interfacing.
Page 38
Page 93
Page 93
Page 14
Page 93
Page 20
Page 29
Page 57
Page 87
Page 33
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