Adjusting The Home Position; Adjusting The Needle Up Stop Position - Brother LK3-B430E Mark II Service Manual

6. ADJUSTMENT

6-16. Adjusting the home position

o
e
1. Following the instruction manual, turn on the power, set the program number to 00, and press the foot
switch to set the home position of X and Y axes.
2. Turn off the power. Loosen the screw r and the bolt t, and move the feed plate e and the presser arm y
so that the needle plate q comes to the center of the feed plate e and the presser arm y.
* After that, turn on the power again to check the alignment.
3. If this adjustment does not make the alignment correct, loosen the screw u after turning off the power,
and remove bed covers R i and L o.
Loosen the screws !0 and !1 , rotate the feed home position dogs !2 and !3 gradually, tighten screws again,
and repeat step 1.
4. Turn off the power.
* If oil or grease is adhered to the home position sensors ! 4 and ! 5 , or a wire is broken, error E-A0 may
occur.

6-17. Adjusting the needle up stop position

e
r
w
1. Loosen the screw t (at the U side on the pulley q), and turn the pulley q so that the mark w on the pulley
is inside the mark r of the belt cover e.
The pulley q stops later if it is turned clockwise; it stops earlier if it is turned counterclockwise.
The standard needle up stop position is 6 mm below the needle bar dead point.
Timing between the needle and the feed mechanism is adjusted so that the feed mechanism starts operat-
ing after the needle comes out of the material sewn, and stops before the needle penetrates the material.
* The screw y at the "D" mark is an adjusting screw for the needle down detection function and is ad-
justed 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.
49
y
u
i
t
r
y
!2
w
!0
e
q
q
t
u
LK3-B430E Mark II
!4
X direction Y direction
Feed mechanism operates.
Material
Feed mechanism stops.
!3
!5
!1