Brother JA1450NT Operation Manual page 45

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Symptom
Stitches are
skipped.
The needle
threader can
not be used.
The stitch is
not sewn
correctly.
The fabric
does not feed.
Possible cause
You have not threaded the upper thread
properly.
You have not used the right combination of
fabric, thread and needle.
The needle is bent or blunt.
The needle is incorrectly installed.
Dust has accumulated under the needle
plate or in the bobbin case.
The needle has not been raised to the
correct position.
You have not inserted the needle properly.
The presser foot that you are using is not
correct for the type of stitch.
The thread tension is incorrect.
The thread is tangled.
The darning plate is fitted on the needle
plate.
You have not used the right combination of
fabric, thread and needle.
The thread is tangled, for example, in the
race.
The presser foot you are using is not
appropriate for the type of stitch that you
want to sew.
How to put it right
Correct the upper threading.
Choose a thread and needle that are
appropriate for the type of fabric.
Replace the needle.
Correctly install the needle.
Remove the needle plate and clean the
plate and the bobbin case.
Raise the needle by turning the
handwheel toward you
(counterclockwise) so that the mark on
the wheel points up.
Insert the needle properly.
Attach the presser foot that is correct
for the type of stitch that you want to
sew.
Adjust the tension of the upper thread.
Remove the tangled thread. If the
thread is tangled in the bobbin case,
clean the bobbin case.
Remove the darning plate.
Choose a thread and needle that are
appropriate for the type of fabric.
Remove the tangle thread. If the thread
is tangled in the race, clean the race.
Attach the presser foot that is correct
for the type of stitch that you want to
sew.
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