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JVC AV-27BM3

JVC AV-27BM3
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*STATIC
CONVERGENCE
&
DYNAMIC
CONVER-
GENCE
1.
Connect
a
crosshatch
generator
to
the
input
terminals
and
ad-
just
BRIGHTNESS
and
CONTRAST
contral
for
a
distinct
pat-
tem
.
Adjust
the
convergence
around
the
edges
of
the
picture
tube
by
tilling
the
yoke,
up-down
and
left-right,
and
temporarily
in-
stall
one
wedge
at
the
top
of
the
yoke.
(
Fig.
B-7,
8,
9)
.
Rotate
the
front
pair
of
tabs
(
tour
pole
convergence
magnet
)
as
a
unit
to
minimize
the
separation
of
the
red
and
bive
lines
around
the
center
of
the
screen,
To
adjust
the
convergence
of
red
and
blue,
vary
the
angle
between
the
tabs
{
Fig.
B-5
)
Rotate
the
rear
pair
of
tabs
(
six
pole
convergence
magnets
}
as
a
unit
to
minimize
the
separation
of
the
magenta
(
R/B
}
and
green
lines.
(
Fig.
8-6
)
Adjust
the
spacing
of
the
rear
tabs
te
converge
the
magenta
and
green
lines.
.
Apply
paint
to
fix
six
magnets.
(As
lo
modeis
equipped
with
a
magnet
locking
ring,
lighten
it)
.
Remove
the
wedge
installed
temporarily
on
the
yoke.
.
Tiking
the
angle
of
the
yoke
up,
down
and
sideways,
and
ad-
just
the
yoke
so as
to
obtain
the
circumference
convergence.
(Fig.
B-8,
9)
.
Insert
wedges
to
the
position
as
shown
in
Fig.
B-10
to
oblain
the
best
circumference
convergence.
|.
Wedge
has
a
backing
of
double
sided
adhesive
tape.
There-
Jor,
tear
off
one
side
of
adhesive
tape,
and
fix
the
wedges.
.
White
balance
adjustment
{
Black
&
While
tracking
}
can
now
be
performed.
eWHITE
BALANCE
ADJUSTMENT
(
Black
and
White
Tracking
)
L
z.
Display
a
monochrome
pattern.
Set
the
RED
and
GREEN
ORIVE
VRs
for
their
mechanical
center.
.
Turn
the
RED,
GREEN
and
BLUE
CUT-OFF
VRs
and
the
SCREEN
VR
lully
counterclockwise,
.
Display
a
horizontal
line.
(
Select
the
CUT-OFF
SERVICE
SWITCH
from
N
to
S
and
a
HORIZONTAL
LINE
will
appear.)
.
Turn
SCREEN
VR
slowly
clockwise
until
a
very
faint
horizontal
line
appears.
Tur
the
CUT-OFF
VR
of
the
color
which
has
appeared
first,
clockwise
by
about
10°and
then
adjust
the
SCREEN
VR
again
so
that
the
color
may
shine
faintly.
.
Turn
the
other
color
CUT-OFF
VRs
slowly
clockwise
until
a
reasonable
while
line
appears.
.
Return
the
monochrome
pattern.
(
When
returning
a
monochrome
pattern
select
the
CUT-OFF
SERVICE
SWITCH
from
&
to
N
and
@
monochrome
pattern
will
appear.
}
.
Adjust
the
RED
and
GREEN
DRIVE
VAs
for
best
while
highlights
AV-27BM3
AV-27CM3
(FRONT
VIEW)
AROUND
CENTER
AROUND.
CENTER
(FRONT
VIEW)
Fig.B-5 Fig.B-6
{REAR
VIEW)
an
DEF.
YOKE
Fig.
B7
(FRONT
VIEW)
Reg
SREEN
piye
Ae
NEE
BLU
x,
|RED
GREEN
*-|GREEN,
ReD{
BLUE
BtueE
GREEN
Rep
Tilting
the
yoke
upward
will
move
the
lines
as
tf
Fig.B-8
(FRONT
VIEW)
@REEN
GREEN
BLUE_BLUE
;
RED
RE
BK)
RED
GREEN
BLUE
BLUE
GREEN
RED
Tilting
the
yoke
to
the
right
will
move
the
lines
2s
shown
with
the
arrows.
Fig.B-9
(EXAMPLE)
(REAR
VIEW)
ANODE
GAP
ANODE
GAP
Fix the
wedges
at
the
originat
position.
Fig.5-10
(No.50718)
13

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