Necchi L234A, Instruction Manual

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41
Problem Cause Correction Reference
Stitches
Skipping
3. Needle may not be the correct
size for the fabric being sewn.
3. Use a needle size that is
compatible for the fabric.
10
4. Machine may not be threaded
correctly or threads were
threaded in the incorrect
sequence.
4. Check that machine is
threaded in correct order as
shown in machine manual.
10
5. Using thread that is poor
quality or has uneven filament.
5. Use good quality thread with a
smooth, even filament.
-
Irregular
Stitches
1. Stitches are not balanced. 1. Adjust thread tensions and
possibly cutting width.
16/19
2. Thread is not unreeling
smoothly off the thread spool.
2. Check the thread spool to
ensure thread is not getting
caught.
-
3. Machine may not be threaded
correctly or threads threaded
in the incorrect sequence.
3. Check that machine is
threaded in correct order as
shown on.
10
Fabric
Puckers
1. Thread tensions are set too
tightly.
1. Loosen thread tensions.
16
2. Thread is not unreeling
smoothly off the thread spool.
2. Check the thread spool to
ensure thread is not getting
caught.
-
3. Using thread that is poor
quality or has uneven filament.
3. Use good quality thread with a
smooth, even filament.
-
4. Stitch length is set too short. 4. Adjust stitch length to a longer
setting.
20
5. Differential Feed is not set in
the correct position for the
fabric being sewn.
5. Adjust the differential feed.
18
Irregular
Trimming
1. Upper and lower fabric cutters
are not in proper position.
1. Check alignment of cutters.
37/38
2. Cutter(s) are damaged or worn
out.
2. Replace one or both cutters.
37/38
Fabric Jams
1. Upper and lower fabric cutters
are not in proper position.
1. Check alignment of cutters.
37/38
2. Thread is not unreeling
smoothly off the thread spool.
2. Check the thread spool to
ensure thread is not getting
caught.
-
3. Too much fabric thickness. 3. Compress thick layers with
conventional sewing machine
before sewing on your overlock
machine.
-