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c. Adjustment steps
1. Input signal
Input a window signal (100%).
2. CONTRAST adjustment
Measure the brightness value of the window portion with a
measuring apparatus for brightness and adjust the
CONTRAST until 120 cd/m
(3) White balance adjustment
a. White balance
Four types of files for white balance data are available.
• REFERENCE (6500 K)
• FILE1 (6500 K)
• FILE2 (9300 K)
• FILE3 (USER)
For four types of files, color temperature can be set individually.
However, a person who is unfamiliar with a color temperature
adjustment must make this adjustment using the FILE3 (USER).
An optional ASP-80 for automatic adjustments is available.
b. Caution
This monitor employs a beam feedback clamp system that
detects and clamps the beam current to stabilize the black level
for a long time. Three lines of RGB are therefore displayed in
the upper part of CRT (A-portion in Fig. 4-4-2).
If BACKGROUND is decreased excessively to the extent that
the B-portion in Fig. 4-4-2 becomes invisible, the line in the A-
portion will disappear, disabling the detection of the beam
current. As a result, only the video image of a reduced color
d i s a p p e a r s .
E x e r c i s e g r e a t c a r e w h e n a d j u s t i n g
BACKGROUND.
c. Adjustment procedure 1 (visual adjustment)
1. Input signal
Input a color bar signal.
2. File setting
Select a file whose white balance is to be changed.
Adjust BRIGHTNESS and CONTRAST before white
balance adjustments.
3. Setting before BACKGROUND adjustment
For a color bar signal, place the MONO switch on the front
panel in the "ON" position to display the monochrome screen.
Then, place the SET UP switch in the "ON" position to display
as follows.
Fig. 4-4-2 SET UP ON-State
2
(nit) is obtained.
A-portion
Beam
feedback line
B-portion
Vertical deflection-
compressed
SET UP line
4. Initial adjustment of low light
Produce the screen output of the R (red) signal only using
the SCREEN switch on the front panel. Adjust the
R.BACKGROUND data to the extent that the red line in the
B-portion in the figure shines slightly.
Similarly, adjust the BACKGROUND data of G (green) and
B (blue).
5. Adjustment of high light portion
Return the SET UP, SCREEN switch to "OFF".
While looking at the high light portion of the staircase wave,
adjust the G.GAIN and B.GAIN until the desired color
temperature is obtained.
6. Adjustment of low light portion
While looking at the low light portion of the staircase wave,
adjust the R/G/B BACKGROUND until the desired color
temperature is obtained.
7. Since the steps 5 and 6 above interfere with each other, repeat
the steps 5 and 6 until the desired color temperature spreads
from the low light portion to the high light portion.
d. Adjustment procedure 2
(adjustment with color analyzer)
When adjusting the color temperature of the monitor using a
commercially available color analyzer, adjust the GAIN and
BACKGROUND of the monitor in such a way that the
chromaticity coordinates (x, y) measured with the color analyzer
take the values shown in the table below.
CIE chromatic coordinates (x, y) vs. color temperature
Color temperature
6500K
9300K
1. Input signal
Input a window signal.
2. File setting
Select a file whose white balance is to be changed.
Adjust BRIGHTNESS and CONTRAST before white
balance adjustments.
3. R.BACKGROUND adjustment
The white balance adjustment is made with respect to red.
Therefore, set R.BACKGROUND as follows.
• Place the SET UP switch on the front panel in the "ON"
position to display as shown in Fig. 4-4-2.
• Turn "ON" R (red) only using the SCREEN switch and
adjust the R.BACKGROUND data to the extent that the
red line in the B-portion in the figure shines slightly.
• Return the SET UP/SCREEN switch to "OFF". Do not
move the R.BACKGROUND hereafter.
24
x
y
0.313
0.329
0.283
0.297
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