White Balance Adjustment - Sony BVM-D14H1E Maintenance Manual

[White Balance Adjustment]

1. Outline of the white balance adjustment and calibra-
tion of the color analyzer that is used for the white
balance adjustment are described first.
1,1 The parameter that converts the RGB drive voltage of
a CRT to the chromaticity coordinate is acquired.
This monitor has the copy function of the color temperature
data between two or more monitors.
However, the CRT drive voltage are unique in every
monitor because it is different depending on each CRT.
Therefore, the same color temperature cannot be obtained in
multiple monitors even though the same drive voltage is
given to them. It means that the data that is used to copy the
color temperature, must be the xyY chromaticity coordinate
or similar data that does not depend on each CRT, unlike the
CRT drive that depends on each CRT.
When the D93 MANUAL adjustment is implemented using
the MAINTENANCE/SYSTEM/COLOR TEMP menu of
the SYSTEM CONFIG menu, the parameter that converts
the CRT drive voltage to the chromaticity coordinate is
created while the adjustment is implemented. This parame-
ter is used when copying the color temperature data to other
monitors as shown.
CRT drive voltage
Chromaticity coordinate
Data transmission
Fig. 1-17
1.2 D65 color temperature adjustment
1.3 Copying the color temperature data to the STD color
temperature, COLOR1 color temperature and COL-
OR2 color temperature.
. . . . . On calibration of the color analyzer
When color temperature of any monitor is measured by
two or more color analyzers, these color analyzers show
different measurement values even though the object of
measurement is the same. Also the measurement value
of color analyzer changes as time elapses.
Therefore, any color analyzer must be calibrated so that
it shows the correct measurement value of the following
chromaticity coordinate before using the analyzer.
x
D65 0.313
0.313
D93 0.283
0.283
3-12
CRT drive voltage
Chromaticity coordinate
2
y y (cd/m )
0.329 2.7
0.329 120
0.297 2.7
0.297 120
2. Preparation for Adjustment
2.1 Connect the 480/60i (525) WINDOW signal to the
ANALOG Y/G input connector.
2.2 Connect the RS-232C connector of a color analyzer
CA-100 with the OPTION connector of a monitor
using the cable that is shown by section "3-1. Set-Up
Adjustment When CRT is Replaced - Required tools
and measuring instruments, item 8".
2.3 Set up the CA-100 as described below. Attach the
measurement probe of the CA-100 to the center of the
CRT screen.
Display mode
Baud rate
3. White Balance Adjustment
3.1 White Balance Adjustment (1)
1. Press the SHIFT ON button [to turn on the LED (orange)
on top of the SHIFT button]. Press the 16:9 ON button
[to turn on the LED (orange)] to select the 16:9 mode.
2. Press the MONO ON button to select the B/W mode.
[The green LED turns on.]
3. Select MAINTENANCE menu of the SYSTEM
CONFIG menu.
4. Select VIDEO menu of the MAINTENANCE menu.
5. Take note of the SUB CONTRAST data. Then set 100
to the SUB CONTRAST data.
6. Select SYSTEM/COLOR TEMP menu of the MAIN-
TENANCE menu.
7. Select D93 of the SYSTEM/COLOR TEMP menu. Then
cover the entire CRT screen surface with a black blind cloth.
Select the MANUAL adjustment item and adjust the white
balance until the following value is obtained.
x = 0.283
y = 0.297
8. Select D65 of the SYSTEM/COLOR TEMP menu.
Then cover the entire CRT screen surface with a thick
black blind cloth. Select the MANUAL adjustment
item and adjust the white balance until the following
value is obtained.
x = 0.313
y = 0.329
9. Select the SYSTEM/COLOR TEMP/COPY/OTHER
VALUE menu.
10. After selecting the STD item of the COLOR TEMP menu,
select D93. Copy the D93 color temperature data to STD.
11. After selecting the COLOR1 item of the COLOR
TEMP menu, select D65. Copy the D65 color temper-
ature data to COLOR1.
12. After selecting the COLOR2 item of the COLOR
TEMP menu, select D93. Copy the D93 color temper-
ature data to COLOR2.
13. Select VIDEO menu of the MAINTENANCE menu.
14. Return the SUB CONTRAST data to the original data.
15. Press the MONO button to the OFF position to cancel
the B/W mode. [The green LED turns off.]
BVM-D14H1U/D14H5U/D14H1E/D14H5E/D14H1A/D14H5A
xyY mode
9600