Brother Sewing Machine Operation Manual page 200

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APPENDIX
Symptom
The upper thread was not
threaded correctly.
The combination of fabric, thread
and needle is not correct.
Stitches are
skipped.
The needle is bent or blunt.
The needle is incorrectly installed. Correctly install the needle.
Dust has accumulated under the
needle plate or in the bobbin case.
Dust has accumulated in the feed
dogs or in the bobbin case.
The upper thread was not
threaded correctly.
A high-pitched
The bobbin case is scratched, or
noise is made
has a burr on it.
while sewing.
A bobbin designed specifically for
this machine is not used.
The thread does The needle has not been raised to
not pass through the correct position.
the eye of the
The needle is incorrectly installed. Correctly install the needle.
needle.
The presser foot that is used is not
appropriate for the type of stitch
that you wish to sew.
The stitch is not
The thread tension is incorrect.
sewn correctly.
The thread is tangled, for example,
in the bobbin case.
The feed dogs are lowered.
The stitch is too short.
The presser foot that is used is not
appropriate for the type of stitch
that you wish to sew.
The fabric does
not feed.
The thread is tangled, for example,
in the bobbin case.
Zigzag foot "J" is slanted on a
thick seam at the beginning of
stitching.
198
Probable Cause Remedy
Correct the upper threading.
Select a thread and needle that are
appropriate for the type of fabric
being sewn.
Replace the needle.
Remove the needle plate cover and
clean the race.
Clean the race.
Correct the upper threading.
Replace the bobbin case. Contact
your retailer or the nearest authorized
service center.
Incorrect bobbins will not work
properly. Only use a bobbin
designed specifically for this
machine.
Press the "Needle Position" button.
Attach the presser foot that is
appropriate for the type of stitch that
you wish to sew.
Adjust the tension of the upper
thread.
Remove the tangle thread. If the
thread is tangled in the bobbin case,
clean the race.
Slide the drop feed lever to the right
(as seen from the rear of machine).
Lengthen the stitch length.
Attach the presser foot that is
appropriate for the type of stitch that
you wish to sew.
Remove the tangled thread. If the
thread is tangled in the bobbin case,
clean the race.
Use the presser foot locking pin
(black button on the left side) on
zigzag foot "J" to keep the presser
foot level while sewing.
Reference
page 31
page 41
page 42
page 42
page 184
page 184
page 31
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page 25
page 34
page 42
page 70
page 59
page 184
page 110
page 59
page 70
page 184
page 65