Problem
Possible cause
Page
Large degree of puckering
(Thread is too tight)
• Is the upper thread tension too strong?
Make the upper thread tension as weak as possible.
• Is the lower thread tension too strong?
Make the lower thread tension as weak as possible.
• Is the needle tip blunt?
Replace the needle if it is blunt.
• Is the needle too thick?
Replace with as thin a needle as possible.
• Is the thread take-up spring tension too strong?
Make the thread take-up spring tension as weak as
possible.
• Is the thread take-up spring operating range too
large?
Lower the position of the thread take-up spring to as
low a position as possible.
• Is the presser foot pressure too strong?
Adjust the presser foot pressure.
• Is the sewing speed too fast?
Use the sewing speed key to gradually reduce the
sewing speed.
See Using the operation
panel (Basic operations)
on page 14.
• Is the angle of the feed dog correct?
Tilt the front of the feed dog down slightly.
See Adjusting the feed dog
angle on page 59.
Lower thread is tangled at
the sewing start.
Bobbin is spinning during
thread trimming.
• Is the bobbin spinning direction correct when the
lower thread is being pulled?
Set the bobbin so that it turns in the opposite
direction to the rotary hook.
• Is there too much thread wound onto the bobbin?
The bobbin winding amount should not be more than
80%.
• Is the anti-spin spring attached?
Attach the anti-spin spring.
• Is the bobbin turning smoothly?
If the bobbin is not turning smoothly, replace the
bobbin.
• Is a bobbin other than the light-alloy bobbin specified
by Brother being used?
Use only bobbins which are specified by Brother.
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