Troubleshooting - Janome MB-4 Instruction Book

Troubleshooting

Problem
The machine does not run.
The machine is noisy.
The needle thread breaks.
The bobbin thread breaks.
The needle breaks.
Skipped stitches
Embroidery pattern is
distorted or not aligned.
The tread forms loops.
Cause
1. The machine is not plugged in correctly.
2. The threads are jammed in the hook or
around the take-up lever.
3. A confirmation message or an error message
is displayed.
4. The control system does not work correctly.
1. Lint has accumulated in the hook.
2. The machine runs out of oil.
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 not inserted properly.
5. Stitch density is too dense.
6. Poor quality threads are used.
7. The bobbin thread is not threaded properly.
1. The bobbin thread is not threaded properly.
2. Lint has accumulated in the hook.
3. The bobbin is not inserted into the bobbin
case properly.
4. The bobbin or bobbin case has a scratch or
nick.
1. The needle is not inserted properly.
2. The needle is bent or blunt.
3. The needle clamp screw is loose.
4. The needle thread tension is too tight.
5. Stitch density is too dense.
7. The needle thread is not threaded properly.
1. The needle is not inserted properly.
2. The needle is bent or blunt.
3. The needle thread is not threaded properly.
4. The fabric is not stretched tight enough in the
hoop.
1. The needle thread tension is too tight.
2. The fabric is not stretched tight enough in the
hoop.
3. A stabilizer is not used.
4. The fabric is caught or trapped while stitching.
5. The threads are tangled on the bottom side of
the fabric.
6. Short stitches are eliminated with the "Ignore
short stitches" setting.
1. The needle thread tension is too loose.
2. The bobbin is not inserted properly.
3. A poor quality thread is used.
81
Reference
See page 13.
Remove jamming threads.
Follow the message to turn
it off.
Turn the power off and turn
it on again.
See page 76.
See page 78.
See page 19.
See page 30.
See page 31.
See page 31.
Modify the pattern by using
an embroidery software.
Use a high quality threads.
See page 17.
See page 17.
See page 76.
See page 17.
Replace the bobbin or
bobbin case.
See page 31.
See page 31.
See page 31.
See page 30.
Modify the pattern by using
an embroidery software.
See page 19.
See page 31.
See page 31.
See page 19.
See page 22.
See page 30.
See page 22.
See page 15.
See page 27.
Cut off and remove the
tangled threads.
See pages 59, 67.
See page 30.
See page 17.
Use a high quality thread.