White Balance Adjustment - Durabrand DCF2003 Service Manual

16. 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
after zero point calibration, bring the optical recep-
tor 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," "LANGUAGE," "AC-
CESS CODE," "SOUND TYPE," "VIDEO TONE,"
"FM MODE," "V-OUT," "VIDEO," "AV MEMO,"
"STABLE SOUND," "FILTER," "500," and "YUV
MEMORY" cyclically when "VOL p" button is
pressed.) then Press No. 8 button on the service re-
mote control Unit.
6. Press No. 4 button on the service remote control
unit for Red adjustment. Press N0. 5 button on the
service remote control unit for Blue adjustment.
7. In each color mode, Press "CH o/p" button to adjust
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 Hori-
zontal 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%.
Note: Confirm that Cut Off Adj. is correct after this
adjustment, and attempt Cut Off Adj. if needed.
Mode Input
White
Raster
RF
(APL
100%)
Spec.
See below
Figure
Color Analyzer
Fig. 3
17. 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 5-8)
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," "C-CLR," "TNT," "V-
TNT," "S-TNT," "C-TNT," "SHARP," "S-SRP," and
"C-SRP" 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 but-
ton on the TV unit.)
18. Focus Adjustment
Purpose: Set the optimum Focus.
Symptom of Misadjustment: If Focus Adjustment is
incorrect, blurred images are shown on the display.
Test Point Adj. Point
--- Focus Control
Tape
---
Generator
Note: Focus VR (FBT) - Main CBA,
FBT=Fly Back Transformer
1. Operate the unit more than 30 minutes.
2. Face the unit to the East and Degauss the CRT
using Degaussing Coil.
3. Input the Monoscope Pattern.
4. Adjust the Focus Control on the FBT to obtain
clear picture.
5-14
Mode
RF
buttons
M. EQ. Spec.
Pattern
See below
Figure
Black
This bar
just
visible
Fig. 4
Mode
---
M. EQ. Spec.
Pattern
See below
Input
IQW
Input
Mono-
scope
L6625EA