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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 holder.
1. The bobbin thread is not threaded properly in the bobbin case.
2. Lint has collected in the bobbin case.
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. The wrong presser foot is used for a sewing technique.
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 ball point needle is not being used for sewing stretch, and
synthetic fabrics.
4. The needle thread is not threaded properly.
5. A poor quality needle is used.
1. The needle thread tension is too tight.
2. The needle thread is not threaded properly.
3. The incorrect presser foot is being used.
4. The needle is too heavy for the fabric being sewn.
5. The stitch length is too long for the fabric.
6. The foot pressure is not adjusted properly.
7. A stabilizer isn't used when sewing on light weight & very fine fabrics.
1. The feed dog is packed with lint.
2. The stitch length is to short.
3. The feed dog is not raised after ”drop feed” sewing.
1. The needle thread tension is too loose.
2. The needle is not compatible with the fabric being used.
1. The machine isn't plugged in. Foot control is not connected completely.
2. Thread has been caught in the bobbin case area.
3. The presser foot has not been lowered.
1. The stitch density is to dense for the fabric being sewn.
2. No interfacing or stabilizer is being used with unstable fabric.
3. The buttonhole lever has not been lowered.
1. Thread has been caught in the bobbin case area.
2. Lint has built up in the bobbin case area.
1. The foot pressure isn't suitable for fabrics being sewn.
1. The presser foot is raised before auto thread cutting is complete.
2. Threads are caught in the auto thread cutting mechanism.
Condition
The needle thread
breaks.
The bobbin thread
breaks.
The needle breaks.
Skipped stitches
Seam puckering
The cloth is not
feeding smoothly.
Thread loops on the
underside of fabric.
The machine does
not sew or run.
Problems when
sewing buttonholes.
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
Humming sound from motors
It is normal to hear a faint humming sound is coming from the internal motors.
The pattern selection key area may get warm when the machine has been used for hours.
Page 70
Page 21
Even feed / Walking
foot should be used.
Lower the presser
foot.
Page 70
Troubleshooting
75


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