White Balance Adjustment - Sylvania SRT2227X Service Manual

11. 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
Tape M. EQ.
Pattern
Generator,
Color analyzer
Note: Use Service remote control unit
1. Operate the unit more than 20 minutes.
2. Face the unit to east. Degauss the CRT using De-
gaussing Coil.
3. Input the White Raster (APL 100%).
4. Set the color analyzer to the CHROMA mode and af-
ter zero point calibration, bring the optical receptor to
the center on the tube surface (CRT).
5. Enter the Service mode. Press " VOL p " button on
the Service remote control unit and select " C/D "
mode. (Display changes " C/D ", " 7F ", " FRENCH ",
" ACCESS CODE ", " STEREO ", " VIDEO TONE
", " FM-MODE ", and " V-OUT " cyclically when "
VOL p " button is pressed.) then Press No. 8 button
on the Service remote control Unit.
6. Press No. 4 button on the service remote control unit
for Red adjustment. Press N0. 5 button on the Ser-
vice remote control unit for Blue adjustment.
7. In each color mode, Press " CH o / p " button to ad-
just the values of color.
8. Adjusting Red and Blue color so that the temperature
becomes 9200K (x : 286 / y : 294)±3%.
9. At this time, Re-check that Horizontal line is white. If
not, Re-adjust Cut-off Adjustment until the Horizontal
Line becomes pure white.
10. Turn off and on again to return to normal mode. Re-
ceive APL 100% white signal and Check Chroma
temperatures become 9200K (x : 286 / y : 294)±3%.
Mode Input
White
Raster
RF
(APL
100%)
Spec.
See below
Figure
Color Analyzer
Fig. 3
Note: Confirm that Cut Off Adj. is correct after this
adjustment, and attempt Cut Off Adj. if needed.
12. 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.
Test Point Adj. Point
CH o / p
---
Tape
---
Generator
White
Note: IQW Setup level --- 7.5 IRE
Use Service remote control unit
1. Enter the Service mode. (See page 5-1)
Then input IQW signal from RF Input.
2. Press " MENU " button on the Service remote control
unit and Select " BRT " mode. (Display changes
" BRT ", " CNT ", " CLR ", " TNT ", " V-TINT ", and
" SHRAP " cyclically when MENU button is pressed).
Press " CH o / p " buttons so that the bar is just vis-
ible (See above figure).
3. Turn the power off and on again. (Main power but-
ton on the TV unit.)
5-5
Mode
RF
buttons
M. EQ. Spec.
Pattern
See below
Figure
Black
This bar
just
visible
Fig. 4
Input
IQW
L6600EA