Brother International SE-400 Users Manual - English - Page 157

Symptom, Probable Cause, Remedy, Reference - troubleshooting tension

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Symptom Probable Cause Remedy Reference The needle breaks. The upper thread was not threaded correctly. Correct the upper threading. page 32 The upper thread was not threaded correctly (for example, the spool is not installed correctly, the spool cap is too big for the spool being used, or the thread has come out of the needle bar thread guide.) Correct the upper threading. Use the spool cap that best fits the size of the spool being used. page 31 There are knots or tangles in the thread. Remove any knots or tangles. - The selected needle is not appropriate for the thread being used. Select a needle that is appropriate for the type of thread being used. page 39 The upper thread tension is too tight. Loosen the upper thread tension. page 59 The upper thread breaks. The thread is tangled, for example, in the bobbin case. Remove the tangled thread. If the thread is tangled in the bobbin case, clean the race. page 152 The needle is bent or blunt. Replace the needle. The needle is incorrectly installed. Correctly install the needle. page 41 The area around the hole in the Replace the presser foot. presser foot is scratched, or has a Contact your dealer or the nearest - burr on it. authorized service center. 5 The bobbin case is scratched, or has a burr on it. Replace the bobbin case. Contact your dealer or the nearest authorized service center. - A bobbin designed specifically for this machine is not used. Incorrect bobbins will not work properly. Only use a bobbin designed specifically for this machine. page 22 Bobbin thread does not wind neatly on the bobbin. The thread is not passed through the bobbin-winding thread guide correctly. Bobbin spins slowly. The thread that was pulled out was not wound onto the bobbin correctly. Correctly pass the thread through the bobbin-winding thread guide. Move the sewing speed controller to the right (so that the speed will be fast). Wind the thread that was pulled off around the bobbin five or six times clockwise. page 24 page 25 page 25 The bobbin thread is incorrectly installed. Correctly install the bobbin thread. page 27 The lower thread is tangled or breaks. The bobbin is scratched or does not rotate smoothly, or has a burr on it. Replace the bobbin. - The thread is tangled. Remove the tangled thread and clean the race. page 152 Troubleshooting 155

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Troubleshooting
155
5
— — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
The needle breaks.
The upper thread was not
threaded correctly.
Correct the upper threading.
page 32
The upper thread
breaks.
The upper thread was not
threaded correctly (for example,
the spool is not installed correctly,
the spool cap is too big for the
spool being used, or the thread
has come out of the needle bar
thread guide.)
Correct the upper threading.
Use the spool cap that best fits the
size of the spool being used.
page 31
There are knots or tangles in the
thread.
Remove any knots or tangles.
-
The selected needle is not
appropriate for the thread being
used.
Select a needle that is appropriate for
the type of thread being used.
page 39
The upper thread tension is too
tight.
Loosen the upper thread tension.
page 59
The thread is tangled, for example,
in the bobbin case.
Remove the tangled thread. If the
thread is tangled in the bobbin case,
clean the race.
page 152
The needle is bent or blunt.
Replace the needle.
page 41
The needle is incorrectly installed.
Correctly install the needle.
The area around the hole in the
presser foot is scratched, or has a
burr on it.
Replace the presser foot.
Contact your dealer or the nearest
authorized service center.
-
The bobbin case is scratched, or
has a burr on it.
Replace the bobbin case.
Contact your dealer or the nearest
authorized service center.
-
A bobbin designed specifically for
this machine is not used.
Incorrect bobbins will not work
properly. Only use a bobbin
designed specifically for this
machine.
page 22
Bobbin thread
does not wind
neatly on the
bobbin.
The thread is not passed through
the bobbin-winding thread guide
correctly.
Correctly pass the thread through the
bobbin-winding thread guide.
page 24
Bobbin spins slowly.
Move the sewing speed controller to
the right (so that the speed will be
fast).
page 25
The thread that was pulled out
was not wound onto the bobbin
correctly.
Wind the thread that was pulled off
around the bobbin five or six times
clockwise.
page 25
The lower thread is
tangled or breaks.
The bobbin thread is incorrectly
installed.
Correctly install the bobbin thread.
page 27
The bobbin is scratched or does
not rotate smoothly, or has a burr
on it.
Replace the bobbin.
-
The thread is tangled.
Remove the tangled thread and clean
the race.
page 152
Symptom
Probable Cause
Remedy
Reference