Janome HD-5050 Service Manual page 4

Condition
3. Breaking 1. Initial sewing speed is
upper
thread.
2. Thread path is incorrect.
3. Needle is bent or dull.
4. Top tension is too strong.
5. Needle size is inappropriate for
6. Needle eye is worn.
7. Needle hole in needle plate is
4. Breaking 1. Bobbin holder is incorrectly
bobbin
thread.
2. Too much thread is wound
3. Lint is stuck inside the bobbin
4. Thread quality is too low.
5. Thread is jamming around the
5. Needle 1. Needle is hitting the needle plate.
breaks
2. Needle is bent or worn.
3. Needle is hitting the hook.
4. Fabric is being pulled too strongly
WHAT TO DO WHEN
Cause
too fast.
fabric.
worn or burred.
threaded.
on the bobbin.
holder.
bobbin holder.
while sewing.
How to Fix
Start with medium speed.
Use the proper thread path.
Replace with a new needle.
Adjust top tension correctly.
Use appropriate needle for fabric and
thread in use.
Change the needle.
Repair the hole or replace the needle
plate.
Set the bobbin thread correctly.
Adjust the position of bobbin winder
stopper.
Clean the bobbin holder.
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 tip of the rotary
hook".
Guide the fabric gently while sewing.
2
Reference
P. 9
P. 12