Brother SB4138 - Manual (Page 165)

Troubleshooting 163
4
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A high-pitched
noise is made while
sewing.
Dust has accumulated in the feed
dogs or in the bobbin case.
Clean the race. page 149
The upper thread was not threaded
correctly.
Correct the upper threading. page 28
The bobbin case is scratched, or has
a burr on it.
Replace the bobbin case. Contact
your dealer or the nearest
authorized service center.
–
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 needle threader
cannot be used.
The needle has not been raised to the
correct position. Press the “Needle Position”
button.
page 31
The needle is incorrectly installed. Correctly install the needle. page 39
The stitch is not
sewn correctly.
The presser foot that is used is not
appropriate for the type of stitch that
you wish to sew. Attach the presser foot that is
appropriate for the type of stitch
that you wish to sew.
page 138
The thread tension is incorrect.
Adjust the tension of the upper
thread.
page 57
The thread is tangled, for example, in
the bobbin case.
Remove the tangle thread. If the
thread is tangled in the bobbin
case, clean the race.
page 149
The fabric does not
feed.
The feed dogs are lowered.
Slide the drop feed lever to the
right. (as seen from the rear of the
machine)
page 105
The stitch is too short. Lengthen the stitch length. page 60
The presser foot that is used is not
appropriate for the type of stitch that
you wish to sew. Attach the presser foot that is
appropriate for the type of stitch
that you wish to sew.
page 138
The pressure of the presser foot is
weak.
Turn the presser foot pressure dial
to the left to increase the pressure
of the presser foot.
page 43
The thread is tangled, for example, in
the bobbin case.
Remove the tangle thread. If the
thread is tangled in the bobbin
case, clean the race.
page 149
Zigzag foot “J” is slanted on a thick
seam at the beginning of stitching.
Use the presser foot locking pin
(black button on the left side) on
zigzag foot “J” to keep the presser
foot level while sewing.
page 67
Nothing appears in
the LCD.
The brightness of the LCD is either
too light or too dark.
Adjust the brightness of the LCD. page 166
Symptom Probable Cause Remedy Reference