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15. 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
Figure
Note: Use service remote control unit
1. Operate the unit more than 20 minutes.
2. Face the unit to east. Degauss the CRT using
Degaussing Coil.
3. Input the White Raster (APL 100%).
4. Set the color analyzer to the CHROMA mode and
after zero point calibration, bring the optical
receptor to the center on the tube surface (CRT).
5. Enter the Service mode. (See page 5-1.) Press
[VOL p] button on the service remote control unit
and select "C/D" mode. (Display changes "C/D,"
"7F," "LANGUAGE," "ACCESS CODE," "SOUND
TYPE," "VIDEO TONE," "FM-MODE," "V-OUT,"
"VIDEO," "AV MEMO," "STABLE SOUND,"
"FILTER," "500," "YUV MEMORY," "NO SIG BRT,"
"A-MUTE POL," and "V-MENU" cyclically when
[VOL p] button is pressed.) then Press [8] button
on the service remote control Unit.
6. Press [4] button on the service remote control unit
for Red adjustment. Press [5] button on the
service remote control unit for Blue adjustment.
7. In each color mode, Press [CH o / p] buttons to
adjust the values of color.
8. Adjusting Red and Blue color so that the
temperature becomes 9200K (x: 286 / y: 294)±3%.
Downloaded Free from http://www.free-service-manuals.com
Mode
Input
White
Raster
RF
(APL
100%)
Spec.
See below
Color Analyzer
Fig. 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.
Receive APL 100% white signal and Check
Chroma temperatures become 9200K (x: 286 / y:
294)±3%.
Note: Confirm that Cut Off Adj. is correct after this
adjustment, and attempt Cut Off Adj. if
needed.
16. 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]
---
buttons
Tape
M. EQ.
Pattern
---
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," "S-CLR," "TNT," "V-
TNT," "S-TNT," "SHARP," and "S-SHARP"
cyclically when [MENU] button is pressed). Press
[CH o / p] buttons so that the bar is just visible
(See above figure).
3. Turn the power off and on again. (Main power
button on the TV unit.)
5-6
Mode
Input
RF
IQW
Spec.
See below
Figure
Black
This bar
just
visible
Fig. 4
L3401EA
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