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Brother Sewing Machine Operation Manual Page 199

Computerized embroidery and sewing machine.
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Symptom
The lower thread
is tangled or
breaks.
The thread tension
is incorrect.
The fabric is
wrinkled.
Probable Cause
The bobbin thread is incorrectly
installed.
The bobbin is scratched or does
not rotate smoothly, or has a burr
on it.
The thread is tangled.
A bobbin designed specifically for
this machine is not used.
The upper thread was not
threaded correctly.
The bobbin thread is incorrectly
installed.
The combination of fabric, thread
and needle is not correct.
The presser foot holder is
incorrectly installed.
The thread tension is incorrect.
A bobbin designed specifically for
this machine is not used.
The upper thread was not
threaded correctly, or the bobbin
is incorrectly installed.
The spool is incorrectly installed.
The combination of fabric, thread
and needle is not correct.
The needle is bent or blunt.
If thin fabrics are being sewn, the
stitch is too long.
The thread tension is incorrect.
Remedy
Correctly install the bobbin thread.
Replace the bobbin.
Remove the tangled thread and clean
the race.
Incorrect bobbins will not work
properly. Only use a bobbin
designed specifically for this
machine.
Correct the upper threading.
Correctly install the bobbin thread.
Select a thread and needle that are
appropriate for the type of fabric
being sewn.
Correctly install the presser foot
holder.
Adjust the tension of the upper
thread.
Incorrect bobbins will not work
properly. Only use a bobbin
designed specifically for this
machine.
Correctly thread the upper thread and
correctly install the bobbin thread.
Correctly install the spool.
Select a thread and needle that are
appropriate for the type of fabric
being sewn.
Replace the needle.
Shorten the stitch length or sew with
stabilizer material under the fabric.
Adjust the tension of the upper
thread.
Reference
page 29
page 184
page 25
page 31
page 29
page 41
page 46
page 59
page 25
page 29,
page 31
page 31
page 41
page 42
page 59,
page 66
page 59
Troubleshooting 197
5

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