Brother 888-L91 Operation Manual page 93

Symptom
Needle is turned, bent or the point is dull.
No stitching
Bobbin is set incorrectly.
Upper threading is incorrect.
Pieces of thread are caught in the race.
High-pitched
sound while
Upper threading is incorrect.
sewing
A bobbin designed specifically for this machine
is not used.
There are needle holes or friction scratches in
the bobbin case.
The needle clamp screw is loose.
The needle
contacts the
needle plate.
Needle is turned, bent or the point is dull.
Thread is tangled in the bobbin case.
The handwheel
feels sluggish
when it is turned.
■ After embroidering
Symptom
Upper threading is incorrect.
Thread tension is
incorrect.
Bobbin is set incorrectly.
Using improper needle or thread for the
selected fabric.
Thread tension is set incorrectly.
Bobbin thread is incorrectly wound.
Needle is turned, bent or the point is dull.
A bobbin designed specifically for this machine
is not used.
Thread is twisted.
Embroidery pattern
does not sew out
correctly.
Thread tension is set incorrectly.
Fabric was not inserted into the frame correctly
(fabric was loose, etc.).
Stabilizing material was not attached.
There was an object placed near the machine,
and the carriage or embroidery frame hit the
object during sewing.
Probable Cause
Probable Cause
Remedy
Replace the needle.
Reset the bobbin correctly.
Check the steps for threading the machine and
rethread the machine.
Clean the race.
Check the steps for threading the machine and
rethread the machine.
Incorrect bobbins will not work properly. Only
use a bobbin designed specifically for this
machine.
Replace the bobbin case, or consult your
authorized Brother dealer.
Firmly tighten the needle clamp screw. If the
needle is bent or blunt, replace it with a new
one.
Replace the needle.
Remove the tangled thread from the bobbin
case. Re-install the bobbin case so it is
correctly positioned.
Remedy
Check the steps for threading the machine and
rethread the machine.
Reset the bobbin.
Check the information about the needle and
thread to be used.
Adjust the thread tension.
Use a correctly wound bobbin.
Replace the needle.
Incorrect bobbins will not work properly. Only
use a bobbin designed specifically for this
machine.
Use scissors, etc., to cut the twisted thread and
remove it from the bobbin case, etc.
Adjust the thread tension.
If the fabric is not taut in the frame, the pattern
may turn out poorly or there may be shrinkage
of the pattern. Set the fabric into the frame
correctly.
Always use stabilizing material, especially with
stretch fabrics, lightweight fabrics, fabrics with
a coarse weave, or fabrics that often cause
pattern shrinkage. See your authorized Brother
dealer for the proper stabilizer.
If the frame bumps something during sewing,
the pattern will turn out poorly. Do not place
anything in the area where the frame may bump
it during sewing.
Troubleshooting
Reference
B-23
B-17
B-19
A-2
B-19
B-14
A-2
B-23
B-23
A-2
A
Reference
B-19
B-17
B-23
E-26
B-17
B-23
B-14
–
E-26
B-30
B-29
B-28
Appendix A-9