Baby Lock BL9 Service Manual And Parts List page 4

PROBLEM
3. Breaking 1. Initial sewing speed is too fast. Start with medium speed.
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 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
race.
4. Thread quality is too low.
5. Thread is jamming around the Clear out the jamming thread.
bobbin.
6. Bobbin thread tension is too
strong.
5. NEEDLE 1. Needle is hitting the needle
BREAKS plate.
2. Needle is bent or worn.
3. Needle is hitting the hook race. See mechanical adjustment
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
2
REMEDY
Use the proper thread path.
Replace with a new needle.
Adjust upper thread tension
correctly.
Use appropriate needle and
thread for fabric in use.
Change the needle.
Repair the hole or replace the
needle plate.
Clean the hook race.
Change to a high quality sewing
thread.
Adjust bobbin thread tension
correctly.
See mechanical adjustment
"Needle drop ."
Change the needle.
"Clearance between needle and
hook ."
See mechanical adjustment
"Needle swing."
Guide the fabric gently while
sewing.
MODEL BL9
REFERENCE
P. 8
P. 9
P. 12
P. 13, 14
P. 11