2
Condition Cause How to fix Reference
3. 1. Initial sewing speed is Start with medium speed.
too fast.
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 needle thread
too strong. tension correctly.
5. Needle size is Use appropriate needle
inappropriate for fabric. for fabric and thread in use.
6. Needle eye is worn. Change the needle.
7. Needle hole in needle Repair the hole or
plate is worn or burred. replace the needle plate.
4. 1. Incorrectly threaded Thread bobbin correctly.
bobbin.
2. Too much thread is Adjust the position of
on the bobbin. stopper.
3. Lint is stuck inside the Clean the shuttle.
bobbin holder.
4. Thread quality is Change to a higher quality
too low. sewing thread.
5. Thread is jamming Clear out the jamming
around the bobbin. thread.
5. Needle 1. Needle is hitting the See mechanical p.10
breaks needle plate. adjustment “Needle Drop
Position”.
2. Needle is bent or worn. Change the needle.
3. Needle is hitting the See mechanical adjustment p.13
Hook. “Clearance between
Needle and Hook Point”.
4. The fabric moves while See mechanical p.9
the needle is piercing adjustment “Needle
it, or the needle zigzags Swing”.
while in fabric.
5. Fabric is being pulled too Guide the fabric gently
strongly while sewing. while sewing.
Needle
thread
breaks
Bobbin
thread
breaks
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