Magnavox 26MF301B Manuel de service télécharger pdf (Page 19)

5-3 FL11.3EA

The White Balance Adjustment should be

performed when replacing the LCD Panel

or Digital Main CBA.

3. White Balance Adjustment

Purpose: To mix red and blue beams correctly for

pure white.

Symptom of Misadjustment: White becomes bluish

or reddish.

1. Operate the unit for more than 60 minutes.

2. Input the White Raster(70%=70IRE, 40%=40IRE).

3. Set the color analyzer at the CHROMA mode and

zero point calibration. Bring the optical receptor

pointing at the center of the LCD-Panel at a

distance of 1.18 inches(3cm) away from the LCD-

Panel surface.

Note: The optical receptor must be set

perpendicularly to the LCD Panel surface.

4. Enter the Service mode. Press [VOL Y] button on the

remote control unit and select “C/D” mode.

5. [CUTOFF]

Press [1] button to select “COR” for Red Cutoff

adjustment. Press [3] button to select “COB” for

Blue Cutoff adjustment.

[DRIVE]

Press [4] button to select “DR” for Red Drive

adjustment. Press [6] button to select “DB” for Blue

Drive adjustment.

6. In each color mode, press [CH X/Y] buttons to

adjust the values of color.

7. Adjust Cutoff and Drive so that the color

temperature becomes 12000°K (x

0.272 / y

0.278 ±0.005).

8. To cancel or to exit from the White Balance

Adjustment, press [CH RETURN] or [PREV CH]

button.

Test Point

Adj. Point Mode Input

Screen

[VOL Y]

button

[VIDEO1]

C/D

White Raster

(APL 70%)

(APL 40%)

M. EQ. Spec.

Pattern Generator,

Color analyzer

x= 0.272 ± 0.005

y= 0.278 ± 0.005

Figure

Color Analyzer

Perpendicularity

INPUT: WHITE 70%, 40%

To avoid interference from ambient

light, this adjustment should be

performed in a dark room.

L = 1.18 inches

40%=40IRE

70%=70IRE

100IRE

0IRE 0IRE

INPUT SIGNAL

Low

Light

Hight

Light

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 69 70

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Magnavox 26MF301B Manuel de service Page 19

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