Color Balance Adjustment - Hitachi CMP5000WXJ Service Manual

Input Signal Step
AD B LOW adjustment
Measure the black level (0IRE) of Blue signal at K4604, and adjust so that the level of AD B LOW to match the black
level (0IRE) of Green signal which measured with step 10 of video signal.
7
Adjustment error: ± 0.05V
OFFSET mode: Select the RGB 1 mode by top and bottom keys
AD B LOW : 11 key
Adjust by right and left keys.
AD B HIGH adjustment
Measure the signal amplitude of Blue signal at K4604, and adjust so that the level of AD B HIGH to match the signal
amplitude of Green signal which measured with step 10 of video signal.
8
Adjustment error: ± 0.05V
OFFSET mode: Select the RGB 1 mode by top and bottom keys
AD R LOW : 8 key
Adjust by right and left keys.
RGB (PC)
signal
Adjust the black level of Red and Blue
signals to reference with black level
of Green signal
Black level of
Green signal
Black level of
Red or Blue signal

Color Balance Adjustment

Adjusting Point
Input Signal
REFERENCE1 mode
in Factory mode
Fresh color
COLOR : key 3
TINT
108
Color Balance Adjustment
After adjusting the white balance, check the flesh color of figures in LD still pictures. If the color
is not natural, adjust it with the keys on the remote control unit.
: key 4
Reference : Adjustment values using the Media color-difference meter (A-100)
20% window-step signal
White
Balance
80% window-step signal
Flesh
Color
Adjusting Method
Adjust the signal amplitude of Red and Blue
signals to reference with signal amplitude
of Green signal
Green signal
waveform
Red or Blue
signal
Signal amplitude
waveform
of Green signal
Adjusting Method
x
y
(-3dB)
Y
x
y
(-3dB)
Y
x
Window chroma signal
y
Green signal
waveform
Red or Blue
signal
waveform
NTSC HD PC
298 299 302
307 315 308
6.6 5.7 2.9
293 292 297
309 312 319
135 148 66.2
−
430 427
−
365 362