Brother LK3-B448E - Manual (Page 75)

LK3-B448E MARK II /BA-16
18. Troubleshooting
68
18. Troubleshooting
Check Remedy Problem Cause Page
Presser is contacting
thread wiper.
Thread wiper standby
position
Distance between
button clamp and top
of needle plate
Button clamp lifter
amount is too great.
48
Adjust the position of
the thread wiper.
Adjust the height of the
button clamp to within
13 mm.
Button clamp does not
rise.
46
Button clamp does not
drop.
Link return spring is
unhooked.
Presser lifter link is not
moving back.
Hook the link return
spring properly.
Button clamp lift
amount is incorrect.
Distance between
button clamp and top
of needle plate Incorrect position of
button clamp holder
hook assembly
Adjust the button
clamp lift amount.
46
Thread wiper position
is incorrect.
Thread wiper position
Clearance between
thread wiper and
needle tip
The thread wiper is
obstructing the needle.
48
Adjust the operating
distance of the thread
wiper.
Adjust the height of the
thread wiper.
Thread wiper does not
operate correctly.
48
Lower thread winds to
one side.
Bobbin winder thread
tension stud height
Bobbin winder thread
tension stud height is
incorrect.
Adjust the height of the
thread tension stud.
29
Lower thread winding
amount is incorrect.
Thread winding
amount
Bobbin presser
position is incorrect.
Adjust the position of
the bobbin presser.
29
Uneven upper thread
length.
Upper thread length
Refer to "Skipped
stitches occur".
Stitches being skipped
at the sewing start.
29 Adjust the sub-tension.
Refer to "Skipped
stitches occur".
Threads comes
unthreaded.