Condition Cause How to fix Reference
3. Breaking 1. Initial sewing speed is too Start with medium speed.
upper fast.
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 too Adjust upper thread tension p.10
strong. correctly.
5. Needle size is inappropriate Use appropriate needle for
for fabric. fabric and thread in use.
6. Needle eye is worn. Change the needle.
7. Needle hole in needle plate repair the hole or
is worn or burred. Replace the needle plate.
4. Breaking 1. Incorrectly threaded bobbin. Thread bobbin correctly.
bobbin 2. Too much thread is on the Adjust the position of stopper.
thread bobbin.
3. Lint is stuck inside the Clean the shuttle.
bobbin holder.
4. Thread quality is too low. Change to a high quality
sewing thread.
5. Thread is jamming around Clear out the jamming thread.
the bobbin.
5. Needle 1. Needle is hitting the needle See mechanical adjustment p.12
breaks plate. “needle position”.
2. Needle is bent or worn. Change the needle.
3. Needle is hitting the shuttle. See mechanical adjustment p.17
“needle clearance to shuttle”.
4. The fabric moves while the See mechanical adjustment p.27
needle is piercing it, or the “zigzag synchronization”.
needle zigzags while in
fabric.
5. Fabric is being pulled too Guide the fabric gently while
strongly while sewing. sewing.
2
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