Brother 888-F50 Operation Manual page 135

Symptom
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.
Dust or lint is caught in the feed dogs.
Pieces of thread are caught in the race.
Upper threading is incorrect.
High-pitched
sound while
sewing
A bobbin designed specifically for this machine
is not used.
There are needle holes or friction scratches in
the bobbin case.
Feed dogs are set in the down position.
Stitches are too close together.
Wrong presser foot was used.
Needle is turned, bent or the point is dull.
Fabric does not
feed through the
Thread is entangled.
machine.
Zigzag foot "J" is slanted on a thick seam at the
beginning of stitching.
Presser foot pressure is set incorrectly for
fabric.
Probable Cause Remedy
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 Combination"
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 Combination"
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.
Remove the dust or lint.
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.
Slide the feed dog position switch to the right
.
Lengthen the stitch length setting.
Use the correct presser foot.
Replace the needle.
Cut the entangled thread and remove it from the
race.
Use the presser foot locking pin (black button
on the left side) on zigzag foot "J" to keep the
presser foot level while sewing.
Adjust the presser foot pressure
within the settings screen.
Troubleshooting
Reference
B-21
B-21
B-28
B-29
B-39
B-40
B-32
B-21
B-28
A
B-29
B-29
B-29
A-2
S-4, D-3
B-29
B-18
B-21
A-2
A-2
B-21
B-15
A-2
B-2
B-39
B-32
B-29
A-8
S-4
B-43
Appendix A-15