Chroma Gain Adjustment - Hitachi DIGITAL 8 VM-D965LE Service Manual

(3) Chroma Gain Adjustment (Figs. 7-1, 7-2, 7-3)
Purpose:
To set the color saturation under the reference color temperature.
Incompleted Phenomenon:
Color of the picture is denser than that of the subject.
Color of the picture Is lighter than that of the subject.
Equipment/Jig:
Oscilloscope (Vectorscope)
Test Point:
Video Out Jack
Condition:
Attach a C12 filter.
Point at a color bar chart.
Procedure:
1) Refer to display 3-1.
2) Press 3 key.
3) Rerer to dispaly 3-5.
4) WhenUsing an Oscilloscope:
Press the U and D keys to set the red level to around 470mVp-p.
Press the [Ctrl] key and hold it down, then press the U and D keys so the red level is 470mV + 20mVp-p.
(Fig. 7-1)
When Using a Vectorscope:
Press the U and D keys to set the red vector to around 170% of the burst.
Press the [Ctrl] key and hold it down, then press the U and D keys so the red vector is 170% + 5%.
(Figs. 7-2, 7-3)
5) Press [Enter] key, and the display changes as 3-6 and 3-7.
6) Press any key to return to ADJUSTMENT MENU display.
~—— _ Display & Figs
Display 3-1 Display 3-7
ADJUSTMENT MENU « ADJUSTMENT OF CHROMA GAIN »
(GEODESIC RIOD III ISI IOI IOI Ie ADJUSTMENT FINISHED.
ADJUSTMENT PRESS ANY KEY.
RIK RK RARER ER IRIN IRE III III IRIS I IRIS IIA.
[1] | AUTO IRIS CONTROL
[2] | WHITE BALANCE
[3] | CHROMA GAIN
RED
+ 20mV
[U] CHROMA GAIN UP
[D] CHROMA GAIN DOWN
FINE ADJUSTMENT
[Ctrl] + [U] CHROMA GAIN UP
[Ctrl] + [D] CHROMA GAIN DOWN
[ENTER] SAVE & RETURN TO MENU
[ESC] QUIT
Display 3-6
« ADJUSTMENT OF CHROMA GAIN >» ) 1007
E3-9