2
MODEL BL9
PROBLEM
CAUSE
REMEDY
REFERENCE
3. Breaking
1. Initial sewing speed is too fast. Start with medium speed.
upper thread
2. Thread path is incorrect.
Use the proper thread path.
3. Needle is bent or dull.
Replace with a new needle.
4. Upper thread tension is
Adjust upper thread tension
P. 8
too strong.
correctly.
5. Needle size is inappropriate
Use appropriate needle and
for fabric.
thread for fabric in use.
6. Needle eye is worn.
Change the needle.
7. Needle hole in needle plate is Repair the hole or replace the
worn or burred.
needle plate.
4. Breaking
1. Incorrectly thread bobbin case. Thread bobbin case correctly.
bobbin thread
2. Too much thread is around on Adjust the position of stopper.
the bobbin.
3. Lint is stuck inside the hook
Clean the hook race.
race.
4. Thread quality is too low.
Change to a high quality sewing
thread.
5. Thread is jamming around the Clear out the jamming thread.
bobbin.
6. Bobbin thread tension is too
Adjust bobbin thread tension
P. 9
strong.
correctly.
5. NEEDLE
1. Needle is hitting the needle
See mechanical adjustment
P. 12
BREAKS
plate.
“Needle drop .”
2. Needle is bent or worn.
Change the needle.
3. Needle is hitting the hook race. See mechanical adjustment
P. 13, 14
“Clearance between needle and
hook .”
4. The fabric moves while the
See mechanical adjustment
P. 11
needle is piercing it, or the
“Needle swing.”
needle zigzags while in fabric.
5. Fabric is being pulled too
Guide the fabric gently while
strongly while sewing.
sewing.
