Brother 888-H72 Operating Manual page 134

Troubleshooting
Symptom
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.
The fabric feeds in
the opposite The feed mechanism is damaged.
direction.
The needle
The needle clamp screw is loose.
contacts the
needle plate.
Needle is turned, bent or the point is dull.
Fabric being sewn
with the machine
Thread is tangled below the needle plate.
cannot be
removed.
A broken needle
has fallen into the –
machine.
The handwheel
feels sluggish Thread is tangled in the bobbin case.
when it is turned.
A-16
Probable Cause Remedy
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.
Contact your authorized Brother dealer or the
nearest Brother authorized service center.
Firmly tighten the needle clamp screw. If the
needle is bent or blunt, replace it with a new
one.
Replace the needle.
Lift up the fabric and cut the threads below it,
and clean the race.
Turn off the machine, and then remove the
needle plate. If the needle that fell into the
machine can be seen, use tweezers to remove
it. After removing the needle, return the needle
plate to its original position and insert a new
needle.
Before turning on the machine, slowly turn the
handwheel toward you to check that it turns
smoothly and that the new needle enters
through the center of the needle plate opening.
If the handwheel does not turn smoothly or the
needle that fell into the machine cannot be
removed, contact your authorized Brother
dealer or the nearest Brother authorized service
center.
Remove the tangled thread from the bobbin
case. Re-install the bobbin case so it is
correctly positioned.
Reference
A-2
A-2
B-21
B-15
A-2
B-2
B-40
B-32
B-29
A-8
S-4
B-44
–
B-29
B-29
A-8
A-8
A-5, A-8