Brother International DB2-B791 Service Manual - Page 42

Nedle, Posit

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13. Sensor position adjustment The photo-cell position needs to be adjusted when the reflection sensor position is changed. 0 0 0 0 0 qt„r, NEDgyLPmOESIT S%E "g" Distance indication 0 2 PLY SENSOR A B C D CORRECTION Lni] 0 0 481 Oy 14 TACK STITCHES 0 0 (1) Turn off the power. (2) Seta material under the presser foot 0 (on the sensor). X The photo-cell position might not be properly adjusted without materials. (3) Disconnect the synchronizer cord @. (4) Set the correction switch 0 to ON. (5) Set the sensitivity control switch() to THIN. (6) Turn on the power. The ply sensor indicator @ should blink. Adjust the position of the photo-cell O so that the number indicated on the display is at its maximum. The number should be at least 1260 (1260 is indicated when no material is on the presser foot). [Adjustment] (1) Move the photo-cell CI slightly right and left or back and forth by loosening the screw O. (2) Secure the photo-cell 0 with the screw @when the indicated number is at its maximum. X It takes about 5 seconds to indicate the number. [Cautions for installing the sensor guard] 0 rtst..A.I.~1-4) 0.5-1.0 mm The sensor guard 0 is used to prevent fingers from getting into the plate (R) @and to prevent materials from getting uneven. When the feed dog is under the needle plate, adjust the gap between the upper surface needle plate 0 and the bottom of the sensor guard 0 to 0.5-1 mm, using the screw 0. The machine may not stop if fingers are put in the sensor. -41 -

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13.
Sensor
position
adjustment
The
photo
-cell
position
needs
to
be
adjusted
when
the
reflection
sensor
position
is
changed.
0
0
0
0 0
Distance
indication
0
2
PLY
SENSOR
A
B
C
D
CORRECTION
Li
n
]
0
0
481
14
O
y
TACK
STITCHES
„
gym
g
qtr,
NEDLE
POSIT
SE
%
""
0
0
(1)
Turn
off
the
power.
(2)
Seta
material
under
the
presser
foot
0
(on
the
sensor).
X
The
photo
-cell
position
might
not
be
properly
adjusted
without
materials.
(3)
Disconnect
the
synchronizer
cord
@
.
(4)
Set
the
correction
switch
0
to
ON.
(5)
Set
the
sensitivity
control
switch()
to
THIN.
(6)
Turn
on
the
power.
The
ply
sensor
indicator
@
should
blink.
Adjust
the
position
of
the
photo
-cell
O
so
that
the
number
indicated
on
the
display
is
at
its
maximum.
The
number
should
be
at
least
1260
(1260
is
indicated
when
no
material
is
on
the
presser
foot).
[Adjustment]
(1)
Move
the
photo
-cell
CI
slightly
right
and
left
or
back
and
forth
by
loosening
the
screw
O.
(2)
Secure
the
photo
-cell
0
with
the
screw
@when
the
indicated
number
is
at
its
maximum.
X
It
takes
about
5
seconds
to
indicate
the
number.
[Cautions
for
installing
the
sensor
guard]
0
rtst..A.I.~1-4)
The
sensor
guard
0
is
used
to
prevent
fingers
from
getting
into
the
plate
(R)
@and
to
prevent
materials
from
getting
uneven.
When
the
feed
dog
is
under
the
needle
plate,
0.5-1.0
mm
adjust
the
gap
between
the
upper
surface
needle
plate
0
and
the
bottom
of
the
sensor
guard
0
to
0.5-1
mm,
using
the
screw
0.
The
machine
may
not
stop
if
fingers
are
put
in
the
sensor.
—41
—