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Troubleshooting 293
7
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The upper thread
breaks.
Sliding surface on hook is not
smooth. There are burns on it.
1 Hook race area
Consult your nearest Brother
dealer.
The thread is loose in the hook
area.
Remove the loose thread. If the
thread is tangled in the hook,
clean the hook.
p.282
The play between the hook and
the race is too much.
Consult your nearest Brother
dealer.
The hook does not rotate
smoothly.
Remove lint, clean and apply
oil.
p.282, 287
The space between the hook
stopper and the hook cannot be
adjusted.
Consult your nearest Brother
dealer.
The upper thread is not
threaded correctly.
Pull the upper thread by hand
from below the presser foot,
and check that the thread
moves smoothly. If the thread
does not move smoothly, it is
not correctly threaded.
Un-thread the machine and
re-thread the machine.
Make sure the thread is
correctly positioned in the
needle bar thread guide.
p.56-59
Upper thread is not positioned
in upper or middle thread guide.
Make sure thread passes
completely under upper and
middle thread guide.
p.56-59
There are knots or tangles in the
thread.
Remove any knots or tangles.
The upper thread tension is too
high.
Decrease the upper thread
tension.
p.123
The lower thread tension is
incorrect.
The thread does not roll out of
the bobbin case smoothly.
Adjust the lower thread
tension.
p.122
The bobbin case is damaged.
Replace the bobbin case with a
new one.
p.35
The bobbin thread is not wound
correctly.
Check that the bobbin is
wound so that it is about 80%
full and that the thread is
evenly wound. If the bobbin is
not correctly wound, replace
the bobbin with one that is
correctly wound or rewind the
bobbin.
p.35
A bobbin designed specifically
for this machine is not used.
Use the correct bobbin. p.35
The automatic needle-threading
mechanism is broken.
Consult your nearest Brother
dealer.
Symptom Probable Cause Remedy Reference Page
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