Brother International SB3150 Operation Manual - Page 132

Check the Fabric/Thread/Needle

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Troubleshooting Symptom Needle breaks. Upper thread breaks. Probable Cause Remedy Reference Needle is defective. Replace the needle. B-29 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. B-15 Upper threading is incorrect. Check the steps for threading the machine and rethread the machine. B-21 Bobbin is set incorrectly. Presser foot is attached incorrectly. Screw of the presser foot holder is loose. Fabric is too thick. Reset the bobbin thread correctly. B-18 Attach the presser foot correctly. B-31 Securely tighten the screw of the presser foot. B-32 Use fabric that the needle can pierce when the handwheel is turned. B-28, S-4 Fabric is fed forcefully when sewing thick fabric Allow the fabric to be fed without being or thick seams. forcefully pushed. Stitch length is too short. Adjust the stitch length. S-4 B-40 Bobbin thread is incorrectly wound. Use a correctly wound bobbin. Machine is not threaded correctly (used the wrong spool cap, spool cap is loose, the thread Rethread the machine correctly. did not catch the needle bar threader, etc). Knotted or tangled thread is being used. Remove any knots or tangles. B-15 B-21 - The selected needle is not appropriate for the thread being used. Upper thread tension is too tight. Select a needle that is appropriate for the type of thread being used. B-28 Adjust the thread tension. B-41 Thread is tangled. Use scissors, etc., to cut the tangled thread and remove it from the race, etc. A-5 Needle is turned, bent or the point is dull. Needle is installed incorrectly. There are scratches around the opening in the needle plate. Replace the needle. Reinstall the needle correctly. B-29 B-29 * There is a notch on the left side of the opening in the needle plate. This is not a scratch. a Replace the needle plate, or consult your authorized Brother dealer. A-8 1 Notch There are scratches around the opening in the Replace the presser foot, or consult your presser foot. authorized Brother dealer. There are scratches on the bobbin case. Replace the bobbin case, or consult your authorized Brother dealer. Using improper needle or thread for the selected fabric. Check the "Fabric/Thread/Needle Combinations" chart. While sewing, the thread became knotted or tangled. Rethread upper and lower thread. 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. B-31 A-2 B-28 B-15, B-21 B-15 A-14

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Troubleshooting
A-14
Needle breaks.
Needle is defective.
Replace the needle.
B-29
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.
B-15
Upper threading is incorrect.
Check the steps for threading the machine and
rethread the machine.
B-21
Bobbin is set incorrectly.
Reset the bobbin thread correctly.
B-18
Presser foot is attached incorrectly.
Attach the presser foot correctly.
B-31
Screw of the presser foot holder is loose.
Securely tighten the screw of the presser foot.
B-32
Fabric is too thick.
Use fabric that the needle can pierce when the
handwheel is turned.
B-28, S-4
Fabric is fed forcefully when sewing thick fabric
or thick seams.
Allow the fabric to be fed without being
forcefully pushed.
S-4
Stitch length is too short.
Adjust the stitch length.
B-40
Bobbin thread is incorrectly wound.
Use a correctly wound bobbin.
B-15
Upper thread
breaks.
Machine is not threaded correctly (used the
wrong spool cap, spool cap is loose, the thread
did not catch the needle bar threader, etc).
Rethread the machine correctly.
B-21
Knotted or tangled thread is being used.
Remove any knots or tangles.
–
The selected needle is not appropriate for the
thread being used.
Select a needle that is appropriate for the type
of thread being used.
B-28
Upper thread tension is too tight.
Adjust the thread tension.
B-41
Thread is tangled.
Use scissors, etc., to cut the tangled thread and
remove it from the race, etc.
A-5
Needle is turned, bent or the point is dull.
Replace the needle.
B-29
Needle is installed incorrectly.
Reinstall the needle correctly.
B-29
There are scratches around the opening in the
needle plate.
*
There is a notch on the left side of the
opening in the needle plate. This is not a
scratch.
1
Notch
Replace the needle plate, or consult your
authorized Brother dealer.
A-8
There are scratches around the opening in the
presser foot.
Replace the presser foot, or consult your
authorized Brother dealer.
B-31
There are scratches on the bobbin case.
Replace the bobbin case, or consult your
authorized Brother dealer.
A-2
Using improper needle or thread for the
selected fabric.
Check the “Fabric/Thread/Needle
Combinations” chart.
B-28
While sewing, the thread became knotted or
tangled.
Rethread upper and lower thread.
B-15, B-21
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.
B-15
Symptom
Probable Cause
Remedy
Reference
a