Brother SL-7360 Instruction Manual page 56

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 presser foot pressure is too weak.
¡The upper thread tension is too weak.
¡The lower thread tension is too strong.
¡The upper thread tension is too strong.
¡The lower thread tension is too weak.
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 the thread tension.
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.
Adjust the thread tension.
Loosen the upper and lower thread
tensions.
Decrease the presser foot pressure.
Replace the needle.
Use as thin a needle as possible.
– 44 –
Remedy
SL-7360
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