Sylvania 6620LE Service Manual page 17

4. Flicker Adjustment
Adjustment Point: VR201 (LCD Main CBA Unit)
LCD Main CBA Unit
Note: Use service remote control unit
1. Enter the Service mode. (See page 5-1.)
2. Press [2] button on the remote control unit.
The following screen appears.
3. If Flicker Adjustment is not fit, the screen become
the following.
FLASH
(Go and Off)
4. Adjust VR201 so that flash stops.
VR201
The following adjustment normally are not
attempted in the field. Only when replacing the
LCD Panel then adjust as a preparation.
5. 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
[CH o / p]
Screen
buttons
M. EQ.
Pattern Generator,
Color analyzer
L = 50 cm
INPUT: WHITE 80%
Note: Use service remote control unit
1. Operate the unit for more than 20 minutes.
2. Input the White Purity (APL 80%).
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 p] button on
the service remote control unit and select "C/D"
mode.
5-1.When "x" value and "y" value are not within
specification, adjust "DB(C/D1)" or "DR(C/D1)".
Refer to "1. Initial Setting."
Note: "DB(C/D1)" or "DR(C/D1)" must be adjusted
within ±10.
5-2.When "x" value and "y" value are not within
specification, adjust "DB(C/D2)" or "DR(C/D2)".
Refer to "1. Initial Setting."
Note: "DB(C/D2)" or "DR(C/D2)" must be adjusted
within ±10.
5-3
Mode Input
VIDEO1 White Purity
VIDEO2 (APL 80%)
Spec.
x (0.256 to 0.316),
y (0.264 to 0.324)
Figure
It carries out in a darkroom.
Perpendicularity
Color Analyzer
Fig. 2
L0306EA