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DP-4X CHASSIS BEAM ALIGNMENT ADJUSTMENT
Preparation for adjustment:
• Pre Heat, Pre-optical focus,
DCU Phase Data, H. POSI
Course and Raster Tilt adjust-
ment should be completed.
• Brightness: 90%
• Contrast Max.
• Receive cross hatch signals,
or dot pattern
• RASTER TILT adjustment
should be finished.
• SCREEN FORMAT should
• be NORMAL mode.
Adjustment procedure:
1) Green (G) tube beam align-
ment adjustment:
Short-circuit 2P subminiature
connector plug pins of Red
(R) and Blue (B) on the CRT
boards and project only
Green (G).
Figure 1
The figure shows that the long and
short knobs of the 2P magnet are
aligned, this is the cancel state.
NOTE: This is the Centering Magnet not
the Beam Alignment Magnets.
This is just shown for reference, but the
principle remains the same.
2) Put Green (G) tube beam
alignment magnet to the can-
cel state as shown in Figure
1.
3) Turn the Green (G) static fo-
cus VR counterclockwise all
the way and make sure of
position of cross hatch center
on screen.
4) Turn Green (G) static focus
VR clockwise all the way.
5) Turn two Beam alignment
magnet in any desired direc-
tion and move cross hatch
center to position found in
step (3). (See Figure 2 be-
low).
6) If image position does not
shift when Green static focus
VR is turned, adjustment
complete.
7) If image position does
PICTURE TUBE SIDE
move, repeat steps [2]
through [6].
8) Conduct beam alignment for
Red and Blue in the same
way.
9) Red (R) focus on focus
pack.
10) Blue (B) focus on focus
pack.
11) Upon completion of adjust-
ment, place a small amount
of white paint on the beam
alignment magnets, to as-
sure they don't move.
(If available).
ADJUSTMENT
BEAM SHAPE &
TABS
ALIGNMENT MAGNET
4-POLE BEAM SHAPE
CORRECTION MAGNET
ZERO FIELD SPACER
(NO ADJUSTMENT)
2-POLE BEAM
ALIGNMENT MAGNET
Figure 2
PAGE 08-09
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