Brother LB6770 PRW Operation Manual page 158

Computerized embroidery and sewing machine
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APPENDIX
Symptom
The lower thread is
A bobbin designed specifically for
this machine is not used.
tangled or breaks.
The thread is
tangled on the
The upper thread was not
wrong side of the
threaded correctly.
fabric.
The upper thread was not
threaded correctly.
The bobbin thread is incorrectly
installed.
The combination of fabric, thread
and needle is not correct.
The thread tension
is incorrect.
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 is
The bobbin thread is incorrectly
too tight.
installed.
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 fabric is
wrinkled.
The needle is bent or blunt.
If thin fabrics are being sewn, the
stitch is too coarse.
The thread tension is incorrect.
The upper thread was not
threaded correctly.
Stitches are
The combination of fabric, thread
skipped.
and needle is not correct.
The needle is bent or blunt.
156
Probable Cause
Remedy
Incorrect bobbins will not work
properly. Only use a bobbin
designed specifically for this
machine.
Correct the upper threading.
Correct the upper threading.
Make sure that the thread is hanged
on the thread guide spring which is
on the left side of the thread guide
cover.
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 install the bobbin thread.
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.
Correct the upper threading.
Select a thread and needle that are
appropriate for the type of fabric
being sewn.
Replace the needle.
Reference
page 22
page 32
page 32,
page 33
page 27
page 39
page 45
page 59
page 22
page 27
page 22,
page 31
page 31
page 39
page 41
page 59,
page 66
page 59
page 32
page 39
page 41

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