Adjusting The Needle And Feed Mechanism Timing - Brother LZ2-B850 Service Manual

5. ADJUSTMENTS
u
o

5-7. Adjusting the needle and feed mechanism timing

q
w
5-05
i
1049S
0599M
B
r
e
0600M
LZ2-B850,B851
<Backtacking and condensed stitches>
The feed amount for backtacking and condensed stitches
is set by means of the condensed stitch adjustment dial
u.
The scale is a guide only; if the length of the finished
stitches differs greatly from the scale value, make the fol-
lowing adjustment.
In addition, carry out the following adjustment when ad-
justing the forward feed amount and reverse feed amount
so that they are the same.
1. Set the condensed stitch adjustment dial u to the "0"
position.
2. While keeping the backtack lever i pressed down, turn
the machine pulley about 10 times and check that the
material feed amount is zero.
If the material feed amount is not zero, make the fol-
lowing adjustment.
3. Turn the condensed stitch adjustment dial u so that it
is slightly to the left or the right of the "0" position.
Repeat steps 2. and 3. until the zero position for the
material feed amount is located.
4. When the zero position for the material feed amount
has been located, loosen the screw o, turn only the dial
section of the condense stitch adjustment dial u to the
"0" position, and then re-tighten the screw o.
The ⁄ mark on the level feed eccentric wheel w should
be aligned with the ⁄ mark on the connecting rod e when
the reference line on the thread take-up lever q is aligned
with the B mark on the face plate.
1. Tilt back the machine head.
2. Align the reference line on the thread take-up lever q
with the B mark on the face plate.
3. Loosen the four screws r.
4. Turn the level feed eccentric wheel w to align the ⁄
mark with the ⁄ mark on the connecting rod e.
5. Securely tighten the four screws r.
* If the needle and feed timing has been adjusted, you
should also adjust "5-15. Adjusting the needle and ro-
tary hook timing". (Refer to page 5-12.)