Emerson LC320EM8, Service Manual

Page: 21 / 69

5-3 A71F0EA
The following adjustment normally are not attempted in
the field. Only when replacing the LCD Panel then adjust
as a preparation.
3. White Balance Adjustment
*This adjustment is required when reparing T-CON
CBA.
Purpose: To mix red, green and blue beams correctly
for pure white.
Symptom of Misadjustment: White becomes bluish
or reddish.
1. Operate the unit for more than 20 minutes.
2. Input the White Purity.
3. Set the color analyzer to the CHROMA mode and
bring the optical receptor to the center on the
LCD-Panel surface after zero point calibration as
shown above.
Note: The optical receptor must be set
perpendicularly to the LCD Panel surface.
4. Enter the Service mode. Press [VOL.
n
] button on
the remote control unit and select “C/D” mode.
5. [CUTOFF]
Press [3] button to select “COB” for Blue Cutoff
adjustment. Press [1] button to select “COR” for
Red Cutoff adjustment.
[DRIVE]
Press [6] button to select “DB” for Blue Drive
adjustment. Press [4] button to select “DR” for Red
Drive adjustment.
6. In each color mode, press [CH.
o
/
p
] buttons to
adjust the values of color.
7. Adjust Cutoff and Drive so that the color
temperature becomes 12000K (x= 0.272 / y=
0.278 ±0.005).
Test Point Adj. Point Mode Input
Screen
[CH.
o
/
p
]
buttons
[RF/VIDEO1, 2]
C/D
White Purity
(APL 70%)
or
(APL 25%)
M. EQ. Spec.
Pattern Generator,
Color analyzer
x= 0.272 ± 0.005
y= 0.278 ± 0.005
Figure
Color Analyzer
It carries out in a darkroom.
L = 3 cm
Perpendicularity
INPUT: WHITE 70%, 25%
25%=25IRE 70%=70IRE
INPUT SIGNAL