30
LK3-B438E Mark II
Maintenance and inspection of the sewing
machine should only be carried out by a quali-
fied technician.
Ask your Brother dealer or a qualified electri-
cian to carry out any maintenance and inspec-
tion of the electrical system.
Turn off the power switch and disconnect the
power cord from the wall outlet at the follow-
ing times, otherwise the machine may oper-
ate if the foot switch is depressed by mistake,
which could result in injury.
· When carring out inspection, adjustment and
maintenance
· When replacing consumable parts such as
the rotary hook and knife
Hold the machine head with both hands
when tilting it back or returning it to its origi-
nal position. Furthermore, after tilting back
the machine head, do not push the face
plate side or the pulley side from above, as
this could cause the machine head to topple
over, which may result in personal injury or
damage to the machine.
If the power switch needs to be left on when
carrying out some adjustment, be extremely
careful to observe all safety precautions.
If any safety devices have been removed,
be absolutely sure to re-install them to their
original positions and check that they op-
erate correctly before using the machine.
10 . STANDARD ADJUSTMENTS
10 . STANDARD ADJUSTMENTS
w
e
e
CAUTION
10-1 . Adjusting the needle bar height
Turn the machine pulley to move the needle bar to the lowest position. Then remove the rubber plug
w
,
loosen the set screw
e
and then move the needle bar up or down to adjust so that the highest reference line
(reference line
A
) is aligned with the lower edge of the needle bar bush
q
.
10-2 . Adjusting the needle bar lift amount
Adjust the needle bar lift amount as described below so that the tip of the rotary hook is aligned with the
center of the needle when the machine pulley is turned to raise the needle bar from its lowest position until
the second reference line from the top of the needle (reference line
B
) is aligned with the lower edge of the
needle bar bush
q
.
1. Open the support
w
in the direction of the arrow, and remove the felt support
e
.
2. Loosen the screw
r
, and move the driver to adjust so that the tip of the rotary hook is aligned with the
needle center line.
* When returning the felt support
e
, place it as shown in the illustration so as not to clamp the felt
t
, and
then gently press the felt
t
and the wick
y
until they are at the same height as the rotary hook race.
* Return the support
w
to its original position.
t
r
w
e
y
t
t
q
q
A
TQ
×
1
B
TQ
×
1
