Troubleshooting - Janome MY LOCK 644D Manuel D'instructions

Troubleshooting

Condition
The fabric is not
being fed
smoothly.
The needle
breaks.
The thread
breaks.
Skipped stitches
The seam is not
sewn neatly.
Seam puckering
The machine
does
not operate.
The fabric is not
cut neatly.
94
1. The feed dog is packed with lint.
2. The presser foot has been raised.
1. The needle is incorrectly inserted.
2. The needle is bent or blunt.
3. The fabric is forcedly pulled.
1. The machine is not correctly threaded.
2. The needle or looper thread tension is too tight.
3. The needle is incorrectly inserted.
4. The needle is bent or blunt.
1. The needle is bent or blunt.
2. The machine is not correctly threaded.
3. The needle is incorrectly inserted.
1. The needle and/or looper thread tensions are
not correctly adjusted.
2. The machine is not correctly threaded.
3. The needle and/or the thread are not suitable
for the fabric being sewn.
4. The thread is not between the tension discs.
1. The needle or looper thread tension is too tight.
2. The machine is not correctly threaded.
3. The differential feed dial is not correctly
adjusted.
1. The machine has not been plugged in firmly.
2. The power switch is turned off.
1. The position of the upper knife is not adjusted
properly.
2. The upper knife is dull.
Cause Reference
See page 90.
Lower the presser foot.
See page 18.
See page 18.
Pull the fabric lightly.
See pages 34 ~ 54, 64 and 68.
See pages 60, 62, 66, 70, 72 and 80.
See page 18.
See page 18.
See page 18.
See pages 34 ~ 54, 64 and 68.
See page 18.
See pages 60, 62, 66, 70, 72 and 80.
See pages 34 ~ 54 and 64.
See pages 74, 76, 84 and 86.
See pages 38, 44, 48 and 52.
See pages 60, 62, 66, 70, 72 and 80.
See pages 34 ~ 54, 64 and 68.
See page 22.
See page 12.
See page 12.
See page 88.
Replace the upper knife.
(See page 88.)