Brother 888-H72 Operating Manual page 133

Symptom
The thread is
Upper threading is incorrect.
tangled on the
wrong side of the
fabric.
Using improper needle or thread for the
selected fabric.
The upper thread is
The bobbin thread is incorrectly installed.
too tight.
Bobbin is set incorrectly.
Bobbin thread is incorrectly wound.
There are scratches on the bobbin or it doesn't
rotate properly.
Bobbin thread
breaks.
Thread is tangled.
A bobbin designed specifically for this machine
is not used.
There is a mistake in the upper or bobbin
threading.
Spool cap is set incorrectly.
Using improper needle or thread for the
selected fabric.
Fabric puckers.
Needle is turned, bent or the point is dull.
Stitches are too long when sewing thin fabrics.
Thread tension is set incorrectly.
Wrong presser foot.
Machine is threaded incorrectly.
Using improper needle or thread for the
selected fabric.
Needle is turned, bent or the point is dull.
Skipped stitches 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.
Needle is turned, bent or the point is dull.
Bobbin is set incorrectly.
No stitching
Upper threading is incorrect.
Probable Cause Remedy
Check the steps for threading the machine and
rethread the machine.
Be sure that the presser foot is in the raised
position when threading the machine so that the
upper thread sets properly in the upper tension.
Check the "Fabric/Thread/Needle
Combinations" chart.
Correctly install the bobbin thread.
Reset the bobbin correctly.
Use a correctly wound bobbin.
Replace the bobbin.
Use scissors, etc. to cut the tangled thread and
remove it from the race, etc.
Incorrect bobbins will not work properly. Only
use a bobbin designed specifically for this
machine.
Check the steps for threading the machine and
rethread it correctly.
Check the method for attaching the spool cap,
then reattach the spool cap.
Check the "Fabric/Thread/Needle
Combinations" chart.
Replace the needle.
Shorten the stitch length.
Adjust the thread tension.
Use the correct presser foot.
Check the steps for threading the machine and
rethread it correctly.
Check the "Fabric/Thread/Needle
Combinations" chart.
Replace the needle.
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.
Replace the needle.
Reset the bobbin thread correctly.
Check the steps for threading the machine and
rethread the machine.
Troubleshooting
Reference
B-21, A-5
B-28
B-18, A-4
B-18
B-15
B-18
A-8
A
B-15
B-21
B-21
B-28
B-29
B-40
B-41
B-32
B-21
B-28
B-29
B-29
B-29
A-2
S-4, D-3
B-29
B-18
B-21
Appendix A-15