White Balance Adjustment; Sub-Tin Adjustment; Sub-Brightness Adjustment - Hitachi C21-FL21F Service Manual

WHITE BALANCE ADJUSTMENT

PREPARATION
1.
Switch on the TV set for at least 20 mins.
2.
Adjust this adjustment after the Purity adjustment.
3.
Ensure the vertical incident illumination on CRT surface
to be 20 lux or less.
4.
Receive the white balance raster.
5.
Turns the low bright adjustment VRs R830, R831 &
R832 fully counterclockwise.
6. Select the IIC control address No. 01 (White point red),
No. 02 (White point green), No. 03 (White point bule)
and set all data to 1FH
7.
Turns the screen VR of FBT fully counterclockwise.
8. Select the IIC control address No. 10 (Sub-contrast)
and set the data to 1FH.
9.
Select the IIC control address No. 09 (Sub-brightness)
and set the data to 26H.
SUB-TINT ADJUSTMENT
PREPARATION
1.
Receive the color bar signal (NTSC).
2.
Set the user control to Contrast: Max, Other: Center.

SUB-BRIGHTNESS ADJUSTMENT

PREPARATION
1.
Switch on the TV set for at least 20 min.
2.
Ensure the vertical incident illumination on CRT surface
to be 20 lux or less.
3.
Receive the color bar pattern.
4.
Set the following setting by remote control handset.
Contrast
Color
Brightness
: min
: min
: Center
1.
Set black stretch (IIC service no. 58) to "0".
2.
Set to lateral line mode (IIC service no. 80) from
"0" to "1".
3. Turns the Screen VR of FBT clockwise and set it to
the position where the bright color line starts to appear.
4.
Takes the first appeared color as the reference,
adjust R830(Green), R831(Blue) & R832(Red) till all
appear to the same level as the reference color.
Note : Don't turn the VR of the reference color.
5.
Adjusts the Screen VR of FBT until the white raster
line is just slightly seen.
6. Release the lateral line mode by changing IIC service
no. 80 from "1" to "0".
7.
Set black stretch (IIC service no. 58) to "1".
8.
Set the White Balance meter probe at the center of
the screen.
9.
Adjusts the following keys of IIC and R830/R831/R832
to the desired W/B color temperature.
R Drive
B Drive
Notes :
a. Fix the G Drive at 1FH(IIC Address No. 02),
do not adjust.
b. To obtain the low brightness and high
brightness conditions, adjust the brightness
control of remote control handset.
1.
Select the IIC control address No. 08.
2.
Set IIC address No. 08 to 1E.
1.
Select the IIc control address No. 09
2.
Adjust the data until A2 portion becomes black and A3
portion becomes lighter black.
A7 A6 A5A4 A3 A2 A1
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PROCEDURES
IIC Address No
01
03
PROCEDURES
PROCEDURES
complete black
lighter black