ELNA eXperience 520 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. Upper thread 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. Incorrectly threaded bobbin.
bobbin
thread 2. Too much thread is around on
the bobbin.
3. Lint is stuck inside the bobbin
holder.
4. Thread quality is too low.
5. Thread is jamming around the
bobbin.
5. Needle breaks 1. Needle is hitting the needle plate.
2. Needle is bent or worn.
3. Needle is hitting the shuttle.
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 needle thread tension correctly.
Use appropriate needle for fabric
and thread in use.
Change the needle.
Repair the hole or replace the needle
plate.
Thread bobbin correctly.
Adjust the position of stopper.
Clean the shuttle.
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 "Zigzag
synchronization".
Guide the fabric gently while sewing.
HOW TO FIX
2
MODEL 520
REFERENCE
P. 17
P. 10
P. 13
P. 16