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11-2. Adjustment of White Balance
After finishing adjustment of cut off (back raster),
approve "Color(15.0) Full white pattern".
Adjust BDRV Data = 85
SCON=127.
Adjust RDRV and GDRV to set chromaticity diagram at :
x: 0.283 0.005
y: 0.298 0.005
Approve "Window pattern (70x70mm)" to adjust
S-CON to Y : 50 1FL.
Approve "Color (15.0) Full white pattern" again and
adjust ABL Data to Y : 32 1FL
12. Focus Adjustment
CONDITIONS
Scanning frequency : All Mode (Mode 1~4)
Display image: "H" character pattern
Brightness: Cut off point
Contrast: Maximum
PROCEDURE
1. Adjust the Focus VR on the FBT to display the
sharpest image possible.
2. Use Locktite to seal the Focus VR in position.
13. Color Purity Adjustment
Color purity is the absence of undesired color.
Conspicuous mislanding (unexpected color in a uniform
field) within the display area shall not be visible at a
distance of 50 cm from the CRT surface.
CONDITIONS
Orientation: Monitor facing east
Scanning Frequency: 1024 x 768@85Hz(69kHz/85Hz)
Display image: White flat field
Luminance: Cut off point at the center of the
display area
Note: Color purity adjustments should only be
attempted by qualified personnel.
PROCEDURE
For trained and experienced service technicians only.
Use the following procedure to correct minor color
purity problems:
1. Make sure the display is not affected by external
magnetic fields.
2. Very carefully break the glue seal between the 2-pole
purity convergence magnets (PCM), the band and
the spacer.
3. Make sure the spacing between the PCM assembly
and the CRT stem is 29 mm
1 mm.
4. Display a green pattern over the entire display area.
5. Adjust the purity magnet rings on the PCM assembly
to display a pure green pattern.
(Optimum setting: x = 0.295
0.015,
y = 0.594 0.015)
6. Repeat steps 4 and 5 using a red pattern and then
again, using a blue pattern.
Table 4-6. Color Purity Tolerances
(For 9300K color adjustment: x = 0.283 0.02,
y = 0.298 0.02)
7. When you have the PCMs properly adjusted,
carefully glue them together to prevent their
movement during shipping.
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Red: x=0.620 0.015 y=0.334 0.015
Green: x=0.620 0.015 y=0.334 0.015
Blue: x=0.620 0.015 y=0.334 0.015