Brother xl 3750 Manual De Instrucciones página 74

Symptom
The area around the hole in the nee-
dle plate is scratched.
The area around the hole in the
presser foot is scratched.
The upper
thread breaks.
The bobbin case is scratched, or has
a burr on it.
You have not used a bobbin that has
been designed for this machine.
You have not wound the bobbin
thread properly.
The bobbin is scratched or does not
turn smoothly.
The lower
The thread is tangled.
thread is tangled
or breaks.
You have not used a bobbin that has
been designed for this machine.
Bobbin is set incorrectly.
You have not threaded the upper
thread properly.
You have not wound the bobbin
thread properly.
You have not threaded the right
combination of thread and needle
for the fabric you are using.
The thread ten-
sion is incorrect. You have not attached the presser
foot holder properly.
The thread tension is incorrect.
You have not used a bobbin that has
been designed for this machine.
Bobbin is set incorrectly.
You have not threaded the upper
thread properly or fitted the bobbin
properly.
You have not fitted the spool prop-
erly.
You have not used the right
The fabric is
combination of fabric, thread and
wrinkled.
needle.
The needle is bent or blunt.
If you are sewing thin fabric, the
stitch is too thick.
The thread tension is incorrect.
Possible cause How to put it right
Replace the needle plate.
Contact your retailer or the nearest
authorized service center.
Replace the presser foot.
Contact your retailer or the nearest
authorized service center.
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.
Wind the bobbin properly.
Replace the bobbin.
Remove the tangled thread and
clean the bobbin case.
Incorrect bobbins will not work
properly. Only use a bobbin that has
been designed for this machine.
Reset the bobbin thread correctly.
Correct the upper threading.
Wind the bobbin thread properly.
Choose a thread and needle that are
appropriate for the type of fabric.
Attach the presser foot holder prop-
erly.
Adjust the tension of the upper thread.
Incorrect bobbins will not work
properly. Only use a bobbin that has
been designed for this machine.
Reset the bobbin thread correctly.
Thread the upper thread and wind
the bobbin thread properly.
Fit the spool properly.
Choose a thread and needle that are
appropriate for the type of fabric.
Replace the needle.
Sew with stabiliser material under
the fabric.
Adjust the tension of the upper
thread.
Reference
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page 26
page 26
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page 70
page 26
page 28-31
page 32
page 26
page 39
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6
page 38
page 26
page 28-31
page 28-33
page 32, 37
page 39
page 16
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page 38
73