Brother 884-639 Manuel D'instructions page 28

Hand Wheel
Thread is getting tangled.
Doesn't Rotate
Rethread machine.
Clean bobbin case and under
needle plate. Oil the machine.
Thread Gets
Upper threading is not
threaded correctly.
Tangled on Wrong
Re-thread machine
Side of Fabric
properly.
If you find it difficult to turn the hand wheel, you may also see "Sewing Machine Doesn't Run" in "Trouble Shooting".
✽
26
Needle is not attached
correctly.
Reattach.
13-15.24 10
Upper thread tension is
too low.
Increase tension.
14
16
Needle is bent, or tip is
dulled.
Change needles.
10
Bobbin case is scratched.
Remove needle plate and
check bobbin case.