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Hitachi Manuals
Projection TV
61HDX98B
Service manual
Hitachi 61HDX98B Service Manual page 48
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User manual
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User manual
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Manual
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BEAM
FORM
ADJUSTMENT
for the DP-85
CHASSIS
BEAM
FORM
Preparation
for adjustment
Adjustments
procedure:
7) IMPORTANT:
Screen
for-
I) Green
CRT beam
shape
ad-
4
mat should
be WORMAL
".
justment.
2) The beam
alignment
should
2) Short-circuit
2P sub-mini
have
been
completed.
connectors
on Red and Blue
2) The Yoke
Tilt,
centering,
CRT PWB
to project
only
3
4
horizontal/vertical
amplitude
the Green
beam.
5)
and optical
focus
adjust-
3) Turn
the green
static
focus
ments
should
have
been
VR fully
clockwise.
completed.
Brightness:
90%,
Contrast:
6)
Max..
Input
a NTSC
DOT signal.
Make
the dot at the screen
center
a true
circle
as
shown
in Figure
2, using
the 4-Pole
magnet
shown
in
Figure
7.
Also
adjust
the Red and
Blue
CRT beam
shapes
ac-
cording
to the steps
(1) to
(3).
After
the adjustment
is
completed,
return
R, G and
B static
VRs to the Best
Fo-
cus point.
BEAM
ALIGNMENT
AND FORM
MAGNETS
ADJUSTMENT
PICTURE
TUBE
SIDE
TABS
,
4-POLE
BEAM SHAPE
CORRECTION
MAGNET
ZERO
FIELD
SPACER
(NO ADJUSTMENT)
2-POLE
BEAM
ALIGNMENT
MAGNET
TRUE
CIRCLE
DEGREE
a/b
SPECIFICATION
a: 0.9
b: 1.1
Figure
2
Figure
1
PAGE
01-19
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