Janome HD718 Service Manual page 4

CONDITION
3. Breaking 1. Initial sewing speed is
upper too fast.
thread 2. Thread path is incorrect.
3. Needle is bent or worn.
4. Upper thread tension is
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 1. Needle is hitting the
breaks 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
too strong.
HOW TO FIX
Start with medium speed.
Use the proper thread path.
Replace with a new needle.
Adjust the upper 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
bobbin winder stopper.
Clean the shuttle.
Change to a high quality
sewing thread.
Remove the jamming
thread.
See mechanical
adjustment "Needle
position."
Change the needle.
See mechanical
adjustment "Needle
clearance to shuttle."
See mechanical
adjustment "Needle swing."
Guide the fabric gently
while sewing.
2
REFERENCE
P.13
P.17
P.11