Brother International Innov-is NQ550PRW Operation Manual - Page 120

Check the Fabric/Thread/Needle

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Troubleshooting Symptom Bobbin thread breaks. Fabric puckers. Skipped stitches No stitching High-pitched sound while sewing Probable Cause Remedy Reference Bobbin is set incorrectly. Reset the bobbin correctly. B-16 Bobbin thread is incorrectly wound. Use a correctly wound bobbin. B-13 There are scratches on the bobbin or it doesn't Replace the bobbin. rotate properly. B-16 Thread is tangled. Use scissors, etc. to cut the tangled thread and A-8 remove it from the race, etc. A bobbin designed specifically for this machine Incorrect bobbins will not work properly. Only is not used. use a bobbin designed specifically for this machine. B-13 There is a mistake in the upper or bobbin threading. Spool cap is set incorrectly. Using improper needle or thread for the selected fabric. Check the steps for threading the machine and B-19 rethread it correctly. Check the method for attaching the spool cap, B-19 then reattach the spool cap. Check the "Fabric/Thread/Needle Combinations" chart. B-26 Needle is turned, bent or the point is dull. Replace the needle. Stitches are too long when sewing thin fabrics. Shorten the stitch length. B-27 B-38 Thread tension is set incorrectly. Wrong presser foot. Adjust the thread tension. Use the correct presser foot. B-39 B-30 Machine is threaded incorrectly. Using improper needle or thread for the selected fabric. Needle is turned, bent or the point is dull. Check the steps for threading the machine and B-19 rethread it correctly. Check the "Fabric/Thread/Needle Combinations" chart. B-26 Replace the needle. B-27 Needle is installed incorrectly. The needle is worn/damaged. Dust or lint has collected under the needle plate. Thin or stretch fabrics are being sewn. Reinstall the needle correctly. Replace the needle. Remove the dust or lint with the brush. Sew with one sheet of thin paper under the fabric. B-27 B-27 A-2 S-4, D-3 Needle is turned, bent or the point is dull. Bobbin is set incorrectly. Replace the needle. Reset the bobbin thread correctly. B-27 B-16 Upper threading is incorrect. Check the steps for threading the machine and B-19 rethread the machine. Dust or lint is caught in the feed dogs. Remove the dust or lint. A-2 Pieces of thread are caught in the race. Clean the race. A-2 Upper threading is incorrect. Check the steps for threading the machine and B-19 rethread the machine. A bobbin designed specifically for this machine Incorrect bobbins will not work properly. Only is not used. use a bobbin designed specifically for this machine. B-13 There are needle holes or friction scratches in Replace the bobbin case, or consult your A-2 the bobbin case. authorized Brother dealer. A-18

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Troubleshooting
A-18
Bobbin thread
breaks.
Bobbin is set incorrectly.
Reset the bobbin correctly.
B-16
Bobbin thread is incorrectly wound.
Use a correctly wound bobbin.
B-13
There are scratches on the bobbin or it doesn’t
rotate properly.
Replace the bobbin.
B-16
Thread is tangled.
Use scissors, etc. to cut the tangled thread and
remove it from the race, etc.
A-8
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-13
Fabric puckers.
There is a mistake in the upper or bobbin
threading.
Check the steps for threading the machine and
rethread it correctly.
B-19
Spool cap is set incorrectly.
Check the method for attaching the spool cap,
then reattach the spool cap.
B-19
Using improper needle or thread for the
selected fabric.
Check the “Fabric/Thread/Needle
Combinations” chart.
B-26
Needle is turned, bent or the point is dull.
Replace the needle.
B-27
Stitches are too long when sewing thin fabrics.
Shorten the stitch length.
B-38
Thread tension is set incorrectly.
Adjust the thread tension.
B-39
Wrong presser foot.
Use the correct presser foot.
B-30
Skipped stitches
Machine is threaded incorrectly.
Check the steps for threading the machine and
rethread it correctly.
B-19
Using improper needle or thread for the
selected fabric.
Check the “Fabric/Thread/Needle
Combinations” chart.
B-26
Needle is turned, bent or the point is dull.
Replace the needle.
B-27
Needle is installed incorrectly.
Reinstall the needle correctly.
B-27
The needle is worn/damaged.
Replace the needle.
B-27
Dust or lint has collected under the needle
plate.
Remove the dust or lint with the brush.
A-2
Thin or stretch fabrics are being sewn.
Sew with one sheet of thin paper under the
fabric.
S-4, D-3
No stitching
Needle is turned, bent or the point is dull.
Replace the needle.
B-27
Bobbin is set incorrectly.
Reset the bobbin thread correctly.
B-16
Upper threading is incorrect.
Check the steps for threading the machine and
rethread the machine.
B-19
High-pitched
sound while
sewing
Dust or lint is caught in the feed dogs.
Remove the dust or lint.
A-2
Pieces of thread are caught in the race.
Clean the race.
A-2
Upper threading is incorrect.
Check the steps for threading the machine and
rethread the machine.
B-19
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-13
There are needle holes or friction scratches in
the bobbin case.
Replace the bobbin case, or consult your
authorized Brother dealer.
A-2
Symptom
Probable Cause
Remedy
Reference