Brother xl 3750 Manual De Instrucciones página 75

APPENDIX / ANEXO —————————————————————————————————————————————————
Symptom
You have not threaded the upper
thread properly.
You have not used the right combi-
nation of fabric, thread and needle.
Stitches are
The needle is bent or blunt.
skipped.
You have not inserted the needle
properly.
Dust has accumulated under the
needle plate or in the bobbin case.
Dust has built up in the feed dogs or
in the bobbin case.
You have not threaded the upper
thread properly.
There is a high-
pitched noise
The bobbin case is scratched.
while sewing.
You have not used a bobbin that has
been designed for this machine.
You have not moved the needle
The needle
holder to its highest position.
threader can not
be used.
You have not inserted the needle
properly.
The presser foot that you are using is
not correct for the type of stitch.
The stitch is not
The thread tension is incorrect.
sewn correctly.
The thread is tangled.
The stitch is too fine.
The darning plate is fitted on the
needle plate.
The fabric does
You have not used the right combi-
not feed.
nation of fabric, thread and needle.
The thread is tangled.
The sewing light
bulb does not The sewing light bulb is damaged.
come on.
74
Possible cause How to put it right
Correct the upper threading.
Choose a thread and needle that are
appropriate for the type of fabric.
Replace the needle.
Insert the needle properly.
Remove the needle plate cover and
clean the plate and the bobbin case.
Clean the bobbin case.
Correct the upper threading.
Replace the bobbin case.
Contact your retailer or the nearest
authorized service center.
Incorrect bobbins will not work
properly. Only use a bobbin that has
been designed for this machine.
Turn the handwheel toward you
(counterclockwise) to raise the nee-
dle holder to the highest position.
Insert the needle properly.
Attach the presser foot that is correct
for the type of stitch that you want to
sew.
Adjust the tension of the upper
thread.
Remove the tangled thread. If the
thread is tangled in the bobbin case,
clean the bobbin case.
Lengthen the stitch length.
Remove the darning plate.
Choose a thread and needle that are
appropriate for the type of fabric.
Remove the tangled thread. If the
thread is tangled in the bobbin case,
clean the bobbin case.
Replace the sewing light bulb.
Reference
page 32
page 39
page 16
page 16
page 70
page 70
page 32
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page 26
page 34
page 17
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page 38
page 70
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page 39
page 70
page 69