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Problem
The
lower
thread
breaks.
Skipped stitches
occur.
The upper thread
does not tighten.
The lower
thread
does not tighten.
The seam is
puckered.
Possible
Cause
The lower thread tension is too strong.
The bobbin is not turning smoothly.
Too much thread is wound around the
bobbin.
The needle is installed incorrectly.
The needle is bent, or the needle tip is
broken.
The needle size is incorrect.
The presserfoot pressure is too weak.
• The upper thread tension is too weak.
• The lower
thread
tension
• The upper thread tension is too strong.
• The lower
thread
tension
The upper and lower thread tensions are too
Strong.
The presser foot pressure is too strong.
The needle tip is broken.
The needle
is too thick.
Decrease
Replace the bobbin or the bobbin case.
Do not wind on more than 80% of the
bobbin capacity.
Install the needle correctly.
Replace the needle.
Use a needle that is suitable for the thread.
Increase the presser foot pressure.
Adjust the thread tension.
is too strong.
Adjust the thread tension.
is too weak.
Loosen the upper and lower thread
tensions.
Decrease the presser foot pressure.
Replace the needle.
Use as thin a needle as possible.
Remedy
the thread
tension.
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DB2-B736
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