Troubleshooting - Necchi EX30 Instruction Book

Troubleshooting

Condition
The needle thread
breaks.
The bobbin thread
breaks.
The needle breaks.
Skipped stitches
Seam puckering
The cloth is not
feeding smoothly.
Stitches form loops
below the works.
The machine does not
work.
Buttonhole is not
sewn properly.
The machine does not
run smoothly and is
noisy.
Auto thread cutting
fails.
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 sewing is
started.
6. The thread is either too heavy or too fine for the needle.
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 doesn't turn smoothly.
4. The thread is wound loosely on the bobbin.
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 presser foot is not appropriate for the stitch pattern being sewn.
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 Tipped 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.
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.
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 either too heavy or too fine for the thread.
1. The machine is not plugged in.
2. Thread has been caught in the hook race.
3. The bobbin winder spindle is not returned to the left after bobbin
winding.
1. The stitch density is not suitable for the fabric being sewn.
2. Suitable interface material has not been used for the stretch or
synthetic fabric.
3. Buttonhole lever is not pulled down.
1. Thread has been caught in the hook race.
2. Lint has built up in the hook race or bobbin holder.
1. Thread being used is too thick.
2. Threads are tangled in auto thread cutter mechanism.
Cause
51
Reference
See page 16
See page 9, 10
See page 12
See page 12
See page 19
See page 12
See page 15
See page 49
Replace the bobbin.
See page 14
See page 12
See page 12
See page 20
See page 12
Change the presser foot.
See page 12
See page 12
See page 12
See page 16
Replace the needle.
See page 9, 10
See page 16
See page 12
Make the stitches shorter.
See page 49
Make the stitches longer.
See page 11
See page 9, 10
See page 12
See page 4
See page 49
See page 14
See page 31
Use an interfacing.
See page 29
See page 49
See page 49
See page 20
See page 49