3 - 8
(3) Chroma Gain Adjustment (Figs. 5-1, 5-2, 5-3)
Incompleted Phenomenon:
Color of the picture is denser than that of the subjuct.
Color of the picture is lighter than that of the subject.
Equipment:
Oscilloscope or Vectorscope
Test Point:
Video Out (PG1601-6)
Condition:
Atach a C12 filter
Point the at a color bar chart.
Procedure:
1)
Input 3 to PC on the adjustment menu screen.
2)
The chroma gain adjustment screen will appear.
3)
When using an oscilloscope (Fig. 5-1):
Press the D or U key to set the red level on waveform to approx. 620 mVp-p.
Then, while holding down the [Ctrl] key, press the D or U key to set the red level on waveform to approx.
620 mV ± 20 mVp-p.
When using a vectorscope (Figs. 5-2, 5-3):
Press the D or U key to set the red vector to approx. 220% of burst vector.
Then, while holding down the [Ctrl] key, press the D or U key to set the red vector to approx. 220% ± 5% of
burst vector.
4)
Press the [Enter] key: The PC display will switch from the chroma gain data write screen to chroma gain
adjustment complete screen.
5)
Press any key to restore the adjustment menu screen.
Chroma gain adjustment
PC Display & Figs
***********************************************************
ADJUSTMENT
***********************************************************
[1]
AUTO IRIS CONTROL
[2]
WHITE BALANCE
[3]
CHROMA GAIN
[ESC] RETURN TO MAIN MENU
Please select [1] - [3] or [ESC]
Adjustment menu
<< ADJUSTMENT OF CHROMA GAIN >>
ROUGH ADJUSTMENT
FINE ADJUSTMENT
[Crt] + [U]
CHROMA GAIN UP
[Crt] + [D]
CHROMA GAIN DOWN
[ENTER]
SAVE & RETURN TO MENU
[ESC]
QUIT
[U]
CHROMA GAIN UP
[D]
CHROMA GAIN DOWN
<< ADJUSTMENT OF CHROMA GAIN >>
DATA WRITING INTO EEPROM
Chroma gain data write
<< ADJUSTMENT OF CHROMA GAIN >>
ADJUSTMENT FINISHED
PRESS ANY KEY
Chroma gain adjustment complete
RED
620 mV
± 20 mV
Fig. 5-1
Fig. 5-2
Fig. 5-3
RED
220 %
± 5 %
BURST
100 %
RED
220 %
± 5 %
BURST
100 %
