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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 under the
presser foot when start sewing.
6. The threads were not drawn to the rear after sewing.
7. The thread is too heavy or too fine for the needle.
8. The thread is tangled around a spool.
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.
1. The needle is incorrectly inserted.
2. The needle clamp screw is loose.
3. The threads were not drawn to the rear after sewing.
4. The needle is too fine for the fabric being used.
5. A wrong presser foot is used.
1. The needle is incorrectly inserted, bent or blunt.
2. The needle and/or threads are not suitable for the work being sewn.
3. The blue tipped needle is not being used for sewing stretch, very
fine fabrics and synthetics.
4. The needle thread is not threaded properly.
5. The poor quality 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.
5. The foot pressure is not adjusted properly.
A stabilizer is not used when sewing very fine fabrics.
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.
1. The needle thread tension is too loose.
2. The needle is too thick or too fine for the fabric.
1. The machine is not plugged in or foot control is not connected.
2. Thread has been caught in the hook race.
3. The presser foot is not lowered.
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
1. Thread has been caught in the hook race.
2. Lint has built up in the hook race or bobbin holder.
1. The foot pressure is not suitable for fabrics being sewn.
1. The presser foot is raised before auto thread cutting is complete.
2. Threads have been caught in the tread cutter mechanism.
Condition
The needle thread
breaks.
The bobbin thread
breaks.
The needle breaks.
Skipped stitches
Seam puckering
The cloth is not
feeding smoothly.
Loops on the
seams
The machine does
not work.
Buttonhole sewing
is not sewn
properly.
The machine is
noisy.
Layers shift.
Thread cutter LED
blinks.
Reference
Page 15
Page 20
Page 19
Page 19
Page 25
Page 25
Page 19
Page 12
Page 14
Page 70
Change the bobbin.
Page 19
Page 19
Page 25
Page 19
Use the correct foot.
Page 19
Page 19
Page 19
Page 15
Change the needle.
Page 20
Page 15
Page 19
Make stitch shorter.
Page 21
Apply a stabilizer.
Page 70
Make stitch longer.
Page 21
Page 20
Page 19
Page 5
Page 70
Page 72
Page 47
Apply an interfacing.
Page 43
Page 70
It is not abnormal that a faint humming sound is coming out from the internal motors.
The pattern selection key area may get warm when the machine has been used for hours.
Page 70
Page 21
Lower the presser
foot.
Page 70
Troubleshooting