White Balance Adjustment - Panasonic PT-60LCX64-K Service Manual

PT-60LCX64-K

WHITE BALANCE ADJUSTMENT

Note:
1. Be sure to perform the White Balance Adjustment
after turning on the power for more than 10 minutes so that
color temperature is stable.
2. This adjustment should be done in a darkroom.
Purpose:
To set the standard white level for each color temperature.
Symptom of Misadjustment:
The white color of picture will become bluish or reddish.
ADJ.
TP
White Balance
R-Level 100
White Balance
B-Level 100
EQUIPMENT
PC(1)/(2), Test Pattern Signal,
NTSC Video Pattern Generator
Test Pattern Signal:
· Gray Scale Pattern Signal (16 scales): "1 White 16 grade
(Horiz)" in "Bar Reverse"
Rough Adjustment:
(Rough adjustment by PC signal : Judged by eye)
1. Connect the PC(2) to the RGB Input 1 Terminal with the
RGB Cable.
2. Set to RGB 1 mode by pressing TV/VIDEO key on the
remote.
3. Supply Gray Scale Pattern Signal (16 scales) from PC(2).
4. Select "White Balance R-Level 100" or "White Balance B-
Level 100" on menu by 2( ), 8( ) key on the 10-key keyboard.
5. Adjust "White Balance R-Level 100" and "White Balance B-
Level 100" by pressing 4(
keyboard so that the area around 14th and 16th scale (A)
becomes pure gray with no red or blue tint.
Gray Scale Pattern Signal (16 scales)
(A)
White
16th gray scale
Note:
Adjust it with viewing in scale(A) though, the white color
of whole screen changes.
INPUT
(RGB Input 1 Terminal)
Gray Scale Pattern Signal (16 scales)
or
(VIDEO Input 1 Terminal)
Gray Scale Pattern Signal (10 scales)
SPECIFICATION
Refer to Description below
), 6( ) key on the 10-key
Black
1st gray scale
Fig. E8-1
(Rough adjustment by video signal : Judged by eye)
1. Connect the NTSC Video Pattern Generator to the VIDEO
Input 1 Terminal.
2. Set to VIDEO 1 mode by pressing TV/VIDEO key on the
remote.
3. Supply Gray Scale Pattern Signal (10 scales).
4. Select "White Balance R-Level 100" or "White Balance B-
Level 100" on menu by 2( ), 8( ) key on the 10-key keyboard.
5. Adjust "White Balance R-Level 100" and "White Balance B-
Level 100" by pressing 4(
so that the area around 9th and 10th scale (B) becomes
pure gray with no red or blue tint.
Gray Scale Pattern Signal (10 scales)
(B)
White
10th gray scale
Note:
Adjust it with viewing in scale(B) though, the white color
of whole screen changes.
104
), 6( ) key on the 10- keyboard
Black
1st gray scale
Fig. E8-2