Brother PR-650 Operation Manual page 261

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Symptom
There are loops in
the upper thread.
The machine is
noisy.
The needle
threader cannot
be used.
The thread
tension is
incorrect.
The upper thread
comes out of the
needle when
embroidering
begins.
The upper thread
does not reach
the bobbin thread
when
embroidering
begins.
Probable Cause
The thread tension does not
correspond to the amount that
the thread tension knob was
tightened.
Thread is not correctly threaded
around upper thread tension
discs.
The thread quality is poor.
Lint may be wound in the hook.
The upper thread is not
threaded correctly.
The hook is damaged.
Not enough oil was applied.
The needle is not at the correct
position.
Recommended needles are not
used on this machine.
The needle is not installed
correctly.
The hook on the automatic
needle-threading mechanism is
bent.
The upper thread is not
threaded correctly.
The bobbin thread is not
correctly threaded.
The lower thread tension is
incorrect.
If a short length of thread
remains after the thread is
trimmed, the needle may
become unthreaded when
embroidering begins again.
There is no more thread in the
bobbin, the thread does not
feed from the bobbin, or the
thread that is fed from the
bobbin is too short.
Remedy
If the thread tension cannot be
adjusted, thread wax and dust
may have collected in the
upper or middle thread guide
plates, causing the thread
tension guide plates to rise.
Clean the thread tension guide
plates.
Clean upper thread tension
disc. Rethread and make sure
tension disc rotates when
pulling on thread.
Try sewing with different
thread. If the problem no
longer occurs after the thread is
changed, the thread quality is
the problem. Replace the
thread with one of good
quality.
Clean the hook.
Check the thread path, and
then thread the upper thread
again.
Replace the hook.
Consult your nearest
authorized dealer.
Oil recommended parts.
Touch the key to move the
desired needle bar to be
threaded into embroidering
position.
Replace and use recommended
needle.
Correctly install the needle.
Consult your nearest
authorized dealer.
Check the thread path, and
then thread the upper thread
again.
Correctly thread the bobbin
thread.
Adjust the tension of the
bobbin thread.
Set the remaining length of
thread to "LONG TAIL" on the
second page of the settings
screen.
Correctly thread the lower
thread.
Reference Page
p.248
p.249
p.245
p.55
p.250
p.62
p.33, 86
p.33, 86
p.33, 86
p.55
p.36
p.112
p.201
p.36
Troubleshooting 259
7