Troubleshooting - JUKI 3622 Manual De Instrucciones

Troubleshooting

Condition
The needle thread
breaks.
The bobbin thread
breaks.
The needle
breaks.
Skipped stitches
Seam puckering
The cloth is not
feeding smoothly.
The machine
doesn't work.
Patterns are
distorted.
Noisy operation
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
properly under the presser foot at the beginning of
sewing.
6. The fabric is not drawn to the rear when the sewing has
finished.
7. The thread is too heavy or too fine for the needle.
1. The bobbin thread is not threaded properly in the
bobbin case and shuttle.
2. Lint has collected in the shuttle area.
3. The bobbin is damaged and doesn't turn smoothly.
1. The needle is incorrectly inserted.
2. The needle is bent or blunt.
3. The needle clamp screw is loose.
4. The needle thread tension is too tight.
5. The fabric is not drawn to the rear when the sewing has
finished.
6. The needle is too fine for the fabric being sewn.
1. The needle is incorrectly inserted.
2. The needle is bent or blunt.
3. The needle and/or threads are not suitable for the work
being sewn.
4. A blue tipped needle is not being used for sewing
stretch, very fine fabrics and synthetics.
5. The needle thread is not threaded properly.
6. The wrong needle is being 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 machine is not plugged in.
2. A thread is caught in the shuttle race.
3. The clutch is disengaged.
1. The stitch is not balanced.
1. There is thread caught in the shuttle race.
2. Lint has built up in the shuttle or the shuttle race.
64
Reference
Page 22
Page 24
Page 16
Page 16
Page 24
Page 32
Page 16
Page 20
Page 60
Change the bobbin
Page 16
Page 16
Page 16
Page 24
Page 32
Page 16
Page 16
Page 16
Page 16
Page 16
Page 22
Change the needle
Page 24
Page 22
Page 16
Make stitch denser
Page 60
Make stitch coarser
Page 14
Page 10
Page 60
Page 20
Page 24
Page 60
Page 60