Brother Simplicity SB7050E Operation Manual page 85

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Symptom
The upper thread
breaks.
Bobbin thread
does not wind
neatly on the
bobbin.
The lower thread is
tangled or breaks.
The thread is
tangled on the
wrong side of the
fabric.
The thread tension
is incorrect.
Probable Cause
There are knots or tangles in the
thread.
The upper thread tension is too
tight.
The thread is tangled, for example,
in the bobbin case.
The needle is bent or blunt.
The needle is incorrectly installed. Correctly install the needle.
The area around the hole in the
embroidery foot is scratched, or
has a burr on it.
The bobbin case is scratched, or
has a burr on it.
A bobbin designed specifically for
this machine is not used.
The thread is not passed through
the bobbin-winding thread guide
correctly.
The thread that was pulled out
was not wound onto the bobbin
correctly.
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 upper thread was not
threaded correctly.
The bobbin thread is incorrectly
installed.
Remedy
Remove any knots or tangles.
Loosen the upper thread tension.
Remove the tangled thread. If the
thread is tangled in the bobbin case,
clean the race.
Replace the needle.
Replace the embroidery foot.
Contact your dealer or the nearest
authorized service center.
Replace the bobbin case.
Contact your dealer or the nearest
authorized service center.
Incorrect bobbins will not work
properly. Only use a bobbin
designed specifically for this
machine.
Correctly pass the thread through the
bobbin-winding thread guide.
Wind the thread that was pulled off
around the bobbin five or six times
clockwise.
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.
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.
Reference
-
page 64
page 78
page 28
-
-
page 29
page 31
page 32
page 34
-
page 78
page 29
page 38
page 38,
page 39
page 34
Troubleshooting 83
3