ELNA 6125QC Service Manual page 4

Condition
Needle
3. 1. Initial sewing speed is
thread
breaks
2. Thread path is incorrect.
3. Needle is bent or dull.
4. Upper thread tension is
5. Needle size is
6. Needle eye is worn.
7. Needle hole in needle
Bobbin
4. 1. Incorrectly threaded
thread
breaks
2. Too much thread is
3. Lint is stuck inside the
4. Thread quality is
5. Thread is jamming
5. Needle 1. Needle is hitting the
breaks
2. Needle is bent or worn.
3. Needle is hitting the
4. The fabric moves while
5. Fabric is being pulled too
Cause
too fast.
too strong.
inappropriate for fabric.
plate is worn or burred.
bobbin.
on the bobbin.
bobbin holder.
too low.
around the bobbin.
needle plate.
shuttle.
the needle is piercing
it, or the needle zigzags
while in fabric.
strongly while sewing.
How to fix
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 higher 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".
Guide the fabric gently
while sewing.
2
Reference
p.15
p.20
p.13