36
LK3-B438E Mark II
2
±
0.5mm
q
w
e
(Approx.
30mm)
Approx.
20mm
r
t
10-11. Adjusting the needle up stop position
The needle up stop position is adjusted so that the
index mark
w
on the machine pulley
q
is inside the
mark
r
on the belt cover
e
.
If adjustment is necessary, loosen the screw
t
at the
“U” mark of the machine pulley
q
and adjust the po-
sition of the machine pulley
q
. The machine pulley
q
stops later if it is turned clockwise, and it stops earlier
if it is turned counterclockwise.
NOTE:
The screw
y
at the “D” mark is an adjusting screw for
the needle down detection function and is adjusted to
match the feed timing, so it should not be loosened.
The screw
u
is a screw for detecting the machine stop
position, and should not be loosened.
* If the index mark
w
is not inside the mark
r
when
the sewing machine is started, error code “E-50”
will be displayed. Turn the machine pulley to move
the index mark
w
to the correct position and then
start the sewing machine.
10-12. Adjusting the thread wiper
1. Loosen the set screw
w
and move the wiper arm support
e
up or down to adjust so that the clearance
between the top of the thread wiper and the needle point
q
is 2
±
0.5 mm when the thread wiper is aligned
with the center of the needle.
* Before carrying out this adjustment, check that the needle bar is lowered 3.5 to 4 mm from the needle up
stop position when the sewing machine stops.
2. Loosen the screw
r
and move the thread guide connecting plate
t
up or down so that the thread wiper
is approximately 20 mm from the needle when it is at the standby position.
10 . STANDARD ADJUSTMENTS
u
w
q
e
r
t
y
