Adjusting The Needle And Rotary Hook Timing; Adjusting The Hook Stopper Position - Brother LZ2-B855E Service Manual

6. ADJUSTMENTS

6-11. Adjusting the needle and rotary hook timing

1 2 3 4 5 6 7
PAT T ERN
TEST TEST
L
r
S E T
w
Zigzag width 0mm
y
0-0.05mm
Maximum
zigzag width
A
y
0.2-0.5mm
0604M

6-12. Adjusting the hook stopper position

q
e
6-09
8 9 9 1 2 3 4 5 6 7 8
PAT T ERN
ROM
L
r
TEST TEST
q
r
t
e
y
i
0-0.05mm
y
o
0606M
0-0.5mm
q
e
A
w
11. Turn on the power switch.
1019S
12. Press the TEST key q and check that the TEST indica-
tor w is illuminated.
9
(For safety purposes, be sure to carry out this step, as
it prevents the motor from operating even if the treadle
is depressed.)
13. Set both the zigzag width and the zigzag base line po-
sition to "0". (Refer to instruction manual pages 77-
79.)
14. Remove the presser foot, needle plate, auxiliary needle
TEST
plate, feed dog and spacer (B856E only). (Refer to 6-10
on page 6-08.)
15. Place the auxiliary needle plate e on the needle plate
installation surface of the machine bed.
16. Turn the machine pulley to move the needle bar r from
its lowest position, and check the following when the
distance from the top of the auxiliary needle plate e
to the bottom edge of the needle bar r is the same as
the height of accessory timing gauge t (No.2 side).
The tip of the rotary hook y should be aligned with
•
the center of the needle.
The distance from the tip of the rotary hook y to
•
the needle should be 0 to 0.05 mm.
Note:
The needle plate and the auxiliary needle plate e
are of different thicknesses, so be sure to use the
auxiliary needle plate e.
17. If the above are not correct, loosen the two screws u
1020S
and adjust the position of the rotary hook i.
After adjustment, securely tighten the two screws u.
18. Set the zigzag width to the maximum setting (8 mm).
19. Turn the machine pulley to move the needle to its fur-
u
thest left position so that the tip of the rotary hook y
is aligned with the center of the needle, and check that
the distance from the upper edge of the needle hole to
the tip of the rotary hook y is 0.2 to 0.5 mm at this
time.
* If the distance is not correct, adjust the height of the
needle bar. (Refer to page 6-08.)
0605M
10. If needle deflection occurs when sewing material with
joints, bend the needle guard o in the direction of the
arrow as shown in the illustration A so that it touches
the needle.
* After this, check that the clearance between the tip
of the rotary hook y and the needle is 0 to 0.05
mm.
11. Press the TEST key q so that the TEST indicator w
switches off.
Normal sewing will then be possible.
Turn off the power to continue adjustment.
Adjust so that the end of the rotary hook holder q is 0
0607M
to 0.5 mm back from end A of the inner rotary hook w.
* The end of the rotary hook holder q must never ex-
tend to the right of end A of the inner rotary hook w.
1. Loosen the screw e and adjust the position of the ro-
tary hook holder q.
2. Securely tighten the screw e.
0608M
LZ2-B855E,B856E