Brother International MD-817 Service Manual - Page 19

Synchronizer, Model, DB2-B737

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Synchronizer Model DB2-B737 •B748 .B774 .B791 0 Higher Lower Il I® Needle up stop 0.5mm Thin, regular materials: 10-12mm Thick materials: 10-14mm Needle down stop Reference line 18-22mm * The synchronizer detects the needle position with two sensors. The thread trimming signal is timed to the needle down position signal and the treadle reverse signal. * When the power is turned on and the needle stopped in the down position, the distance between needle plate top and needle set screw bottom should be 18 to 22mm. When the needle is stopped in the up position and the pulley reference line is within the belt cover reference lines, the distance between needle plate top and needle tip should be 10 to 12mm with thin and regular materials, 10 to 14mm with thick materials. (With Model 6748 the needle up stop position is 10- 14mm.) Adjust as follows when necessary. * Turn the power off. Needle up position 1. Slightly loosen the two screws 0. Move the set screws 0 in the direction of normal pulley movement to raise the needle bare stop position. Turn the other way to lower the needle bar. Needle down position 1. Set the treadle to reverse and then release it to neutral. (This is the needle down stop position.) 2. The distance between the needle plate top and the needle screw bottom should be 18 - 22mm. 0 3. Loosen screw and move the synchronizer 0 to adjust. * Check the needle up stop position. * When the machine pulley is removed once, provide 0.5mm clearance between the pulley bottom and the synchronizer for installation. (Improper clearance causes improper machine operation.) When the synchronizer is out of order. . . * Turn off the power switch and disconnect the synchronizer cord. Use the machine with standard function (without thread trimming) until the synchronizer is replaced. - 15 -

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Synchronizer
Model
DB2-B737
•B748
.B774
.B791
0.5mm
Needle
up
stop
0
Higher
Il
I®
Lower
Thin,
regular
materials:
10-12mm
Thick
materials:
10-14mm
Needle
down
stop
18-22mm
Reference
line
*
The
synchronizer
detects
the
needle
position
with
two
sensors.
The
thread
trimming
signal
is
timed
to
the
needle
down
position
signal
and
the
treadle
reverse
signal.
*
When
the
power
is
turned
on
and
the
needle
stopped
in
the
down
position,
the
distance
between
needle
plate
top
and
needle
set
screw
bottom
should
be
18
to
22mm.
When
the
needle
is
stopped
in
the
up
position
and
the
pulley
reference
line
is
within
the
belt
cover
reference
lines,
the
dis-
tance
between
needle
plate
top
and
needle
tip
should
be
10
to
12mm
with
thin
and
regular
materials,
10
to
14mm
with
thick
materials.
(With
Model
6748
the
needle
up
stop
position
is
10—
14mm.)
Adjust
as
follows
when
necessary.
*
Turn
the
power
off.
Needle
up
position
1.
Slightly
loosen
the
two
screws
0.
Move
the
set
screws
0
in
the
direction
of
normal
pulley
movement
to
raise
the
needle
bare
stop
position.
Turn
the
other
way
to
lower
the
needle
bar.
Needle
down
position
1.
Set
the
treadle
to
reverse
and
then
release
it
to
neutral.
(This
is
the
needle
down
stop
position.)
2.
The
distance
between
the
needle
plate
top
and
the
needle
screw
bottom
should
be
18
—
22mm.
3.
Loosen
screw
0
and
move
the
synchronizer
0
to
adjust.
*
Check
the
needle
up
stop
position.
*
When
the
machine
pulley
is
removed
once,
provide
0.5mm
clearance
between
the
pulley
bottom
and
the
synchronizer
for
installation.
(Improper
clearance
causes
improper
machine
operation.)
When
the
synchronizer
is
out
of
order.
.
.
*
Turn
off
the
power
switch
and
disconnect
the
synchronizer
cord.
Use
the
machine
with
standard
function
(without
thread
trimming)
until
the
synchronizer
is
replaced.
-
15
-