Brother NX-450 - Manual (Page 147)

APPENDIX
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146
The thread tension
is incorrect.
The upper thread was not threaded
correctly.
Correct the upper threading. page 28
The bobbin thread is incorrectly
installed. Correctly install the bobbin
thread.
page 26
The combination of fabric, thread
and needle is not correct.
Select a thread and needle that
are appropriate for the type of
fabric being sewn.
page 38
The presser foot holder is incorrectly
installed. Correctly install the presser foot
holder.
page 43
The thread tension is incorrect.
Adjust the tension of the upper
thread.
page 57
A bobbin designed specifically for
this machine is not used.
Incorrect bobbins will not work
properly. Only use a bobbin
designed specifically for this
machine.
page 22
The fabric is
wrinkled.
The upper thread was not threaded
correctly, or the bobbin is incorrectly
installed. Correctly thread the upper thread
and correctly install the bobbin
thread.
page 26,
page 28
The spool is incorrectly installed. Correctly install the spool. page 28
The combination of fabric, thread
and needle is not correct.
Select a thread and needle that
are appropriate for the type of
fabric being sewn.
page 38
The needle is bent or blunt. Replace the needle. page 39
If thin fabrics are being sewn, the
stitch is too long.
Shorten the stitch length or sew
with stabilizer material under the
fabric.
page 59
The thread tension is incorrect.
Adjust the tension of the upper
thread.
page 57
Stitches are
skipped.
The upper thread was not threaded
correctly.
Correct the upper threading. page 28
The combination of fabric, thread
and needle is not correct.
Select a thread and needle that
are appropriate for the type of
fabric being sewn.
page 38
The needle is bent or blunt. Replace the needle. page 39
The needle is incorrectly installed. Correctly install the needle. page 39
Dust has accumulated under the
needle plate or in the bobbin case. Remove the needle plate cover
and clean the race.
page 142
Symptom Probable Cause Remedy Reference