ELNA Star Edition Service Manual page 4

Condition
3. Breaking 1. Initial sewing speed is too fast.
upper thread.
2. Thread path is incorrect.
3. Needle is bent or dull.
4. Top tension is too strong.
5. Needle size is inappropriate for
fabric.
6. Needle eye is worn.
7. Needle hole in needle plate is
worn or burred.
4. Breaking 1. Bobbin holder is incorrectly
bobbin thread. threaded.
2. Too much thread is wound on
the bobbin,
3. Lint is stuck inside the bobbin
holder.
4. Thread quality is too low.
5. Thread is jamming around the
bobbin holder.
5. Needle 1. Needle is hitting the needle plate.
breaks
2. Needle is bent or worn.
3. Needle is hitting the hook.
4. The fabric moves while the needle
is piercing it, or the needle zigzags
while in fabric.
5. Fabric is being pulled too strongly
while sewing.
Cause
Start with medium speed.
Use the proper thread path.
Replace with a new needle.
Adjust top tension correctly.
Use appropriate needle for fabric and
thread in use.
Change the needle.
Repair the hole or replace the needle
plate.
Set the bobbin thread correctly.
Adjust the position of bobbin winder
stopper.
Clean the bobbin holder.
Change to a high quality sewing thread.
Clear out the jamming thread.
See mechanical adjustment " Needle
drop position ".
Change the needle.
See mechanical adjustment " Clearance
between needle and hook ".
See mechanical adjustment " Needle
swing timing ".
Guide the fabric gently while sewing.
How to Fix
2
Reference
P. 17
P. 10
P. 13
P. 16