Troubleshooting - Brother NS-40 Operation Manual

Troubleshooting

If the machine stops operating correctly, check for the following possible causes before requesting service.
If the problem persists, contact your dealer or the nearest authorized service center.
Symptom
The plug of the power cord is not
inserted into an electrical outlet.
The machine is not turned on.
The bobbin winder shaft is moved to
the right.
The presser foot lever is raised.
A stitch other than the buttonhole or
The sewing
bar tack stitch was selected and the
machine does
start/stop button was pressed while
not operate. the buttonhole lever is lowered.
The buttonhole or bar tack stitch was
selected and the start/stop button was
pressed while the buttonhole lever is
raised.
The start/stop button was pressed,
even though the foot controller is
connected.
The needle is incorrectly installed.
The needle clamp screw is loose.
The needle is bent or blunt.
The combination of fabric, thread and
needle is incorrect.
The appropriate presser foot for the
type of stitch that you wish to sew is
not used.
The upper thread tension is too tight. Loosen the upper thread tension.
The fabric is pulled too much.
The needle
breaks.
The area around the hole in the
needle plate is scratched.
The area around the hole in the
presser foot is scratched.
The bobbin case is scratched.
A bobbin designed specifically for
this machine is not used.
Probable Cause Remedy
Insert the plug of the power cord into
a household electrical outlet.
Turn on the machine.
Slide the bobbin winder shaft to the
left.
Lower the presser foot lever.
Raise the buttonhole lever.
Pull down the buttonhole lever.
Do not use the start/stop button when
the foot controller is connected. To
use the start/stop button, disconnect
the foot controller.
Correctly install the needle.
Use the screwdriver to firmly tighten
the screw.
Replace the needle with a new one.
Select a thread and needle that are
appropriate for the type of fabric
being sewn.
Attach the presser foot that is
appropriate for the type of stitch that
you wish to sew.
Lightly guide the fabric.
Replace the needle plate.
Contact your dealer or the nearest
authorized service center.
Replace the presser foot.
Contact your dealer or the nearest
authorized service center.
Replace the bobbin case.
Contact your dealer or the nearest
authorized service center.
Bobbins from older models, which
have a different thickness, will not
work properly. Only use a bobbin
designed specifically for this
machine.
Reference
page 14
page 14
page 17
page 44
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page 61
4
page 44
page 31
page 32
page 31
page 30
page 89
page 49
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