Hitachi 61HDX98B Service Manual page 41

BEAM ALIGNMENT for DP-85 CHASSIS
WARNING: Remove all rin
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.,,
Preparation for adjustment: 4) Turn Green (G) static focus
Adjust at least 30 minutes
VR clockwise all the way.
after turning on power 51 Turn two Beam alignment
switch. magnet in any desired di-
Raster inclination, center-
rection and move cross
ing, horizontal and vertical hatch center to position
amplitudes and optical fo- found in step (3). (See Fig-
cus adjustment should be we 2).
completed. 6) If image position does not
Brightness: 90% shift when Green static fo-
Contrast Max. cus VR is turned, adjust-
Receive cross hatch signals, ment complete.
or dot pattern
7) If image position does
RASTER TILT adjustment move, repeat steps [21
shoutd be finished. through 161..
ments should have been
completed.
3) Brightness: 90%, Contrast:
Max..
4) Input a NTSC DOT signal.
Adjustments procedure:
1) Green CRT beam shape ad-
justment.
2) Short-circuit 2P sub-mini
connectors on Red and Blue
CRT PWB to project only
the Green beam.
3) Turn the green static focus
VR fully clockwise.
5) SCREEN FORMAT should 8) Conduct beam alignment 4) Make the dot at the screen
-
be FULL mode.
Adjustment procedure:
1) Green (G) tube beam align-
ment adjustment:
Short-circuit 2P subminia-
ture connector plug pins of
Red (R) and Blue (B) on the
CRT boards and project
only Green (G).
for Red and Blue in the
same way.
9) Red (R) focus on focus
pack.
IO) Blue (B) focus on focus
pack.
5
1 1) Upon completion of adjust-
ment, place a small
amount of white paint on
2 ) Put Green
(G) tube beam
the beam alignment mag- 6)
alignment magnet to the
cancel state as shown in
Figure I.
nets, to assure they don't
move. (If available).
cus point.
center a true circle as
shown in Figure 2 on page
07-79, using the 4-Pole
magnet shown in Figure 2
below.
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-
The figure shows that the
long and short knobs of the
2P magnet are aligned, this is
the cancel state.
3) Turn the Green (G) static
focus VR countercfockwise
all the way and make sure
of position of cross hatch
center on screen.
ALJJUS I MtN I
BEAM SHAPE &
ALIGNMENT
4-POLE BEAM SHAPE
CORRECTION MAGNET
ZERO FIELD SPACER
(NO ADJUSTMENT)
Z-POLE BEAM
Figure 2
ALIGNMENT MAGNET
BEAM SHAPE
Preparation for adjustment
1) IMPORTANT: Screen for-
mat should be ziNORMAL ".
2) The beam alignment should
have been completed.
2) The Yoke Tilt, centering,
horizontal/vertical amplitude
and optical focus adjust-
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