Emerson LD200EM8 Service Manual page 26

3. White Balance Adjustment
Purpose: To mix red, green and blue beams correctly
for pure white.
Symptom of Misadjustment: White becomes bluish
or reddish.
Test Point Adj. Point
[RF/VIDEO1]
VOL. n
Screen
[VIDEO2]
buttons
M. EQ.
(at White APL 80%)
x= 0.276 ± 0.03 (0.246 to 0.306)
y= 0.282 ± 0.03 (0.252 to 0.312)
Pattern Generator,
Color analyzer
(at White APL 20%)
x= 0.276 ± 0.01 (0.266 to 0.286)
y= 0.282 ± 0.01 (0.272 to 0.292)
Figure
It carries out in a darkroom.
Perpendicularity
L = 3 cm
INPUT: WHITE 80%, 20%
Note: Use the service remote control unit
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. [RF/VIDEO1]
Enter the Service mode. Press [VOL n] button on
the remote control unit and select "C/D1" mode.
[VIDEO2]
Enter the Service mode. Press [VOL n] button on
the remote control unit and select "C/D2" mode.
5. [RF/VIDEO1]----(APL 80%)
Press [6] button to select "DB(C/D1)" for Blue
adjustment. Press [4] button to select "DR(C/D1)"
for Red adjustment. When "x" value and "y" value
are not within specification, adjust "DB (C/D1)" or
"DR (C/D1)". Refer to "1. Initial Setting."
[RF/VIDEO1]----(APL 20%)
Press [3] button to select "COB(C/D1)" for Blue
Mode Input
White Purity
C/D1 (APL 80%)
or
C/D2
(APL 20%)
Spec.
Color Analyzer
adjustment. Press [1] button to select "COR(C/
D1)" for Red adjustment. When "x" value and "y"
value are not within specification, adjust "COB (C/
D1)" or "COR (C/D1)". Refer to "1. Initial Setting."
6. [VIDEO2]----(APL 80%)
Press [6] button to select "C-DB(C/D2)" for Blue
adjustment. Press [4] button to select "C-DR(C/
D2)" for Red adjustment.When "x" value and "y"
value are not within specification, adjust "C-DB(C/
D2)" or "C-DR(C/D2)". Refer to "1. Initial Setting."
[VIDEO2]----(APL 20%)
Press [3] button to select "C-COB(C/D2)" for Blue
adjustment. Press [1] button to select "C-COR(C/
D2)" for Red adjustment.When "x" value and "y"
value are not within specification, adjust "C-
COB(C/D2)" or "C-COR(C/D2)".
Refer to "1. Initial Setting."
7. Turn the power off and on again. (Main power
button on the TV unit.)
4. Sub-Brightness Adjustment
Purpose: To get proper brightness.
Symptom of Misadjustment: If Sub-Brightness is
incorrect, proper brightness cannot be obtained by
adjusting the Brightness Control.
Adj. Point
Ant. input, Any channel,
SMPTE pattern,
[SETUP]
[RF/VIDEO1]: CG-931 (KENWOOD),
button
[VIDEO2]: CG-931 (KENWOOD),
w/SETUP 7.5IRE
M. EQ.
Pattern
Generator
White
A position
B position
1. Enter the Service mode. Then input above signal.
2. [RF/VIDEO1]
Press [SETUP] button on the service remote
control unit and press [1] on the service remote
control (selecting "BRT" mode).
[VIDEO2]
Press [SETUP] button on the service remote
control unit and press [3] on the service remote
control (selecting "C-BRT" mode).
6-3
Input
Spec.
See below
Figure
Black
C position
A7440EA