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Chroma Gain Adjustment - Hitachi VK-S274R Service Manual

Color & b/w video camera
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Adjustment > Adjustment (Camera Adjustment)
6-5-3 Chroma gain adjustment (Figs. 6-5-1, 6-5-2, 6-5-3)
[For VK-S274R/S274ER]
Incompleted Phenomenon
1) Color of the picture is denser than that of the subject.
2) Color of the picture is lighter than that of the subject.
Test Point
Video Out (PG1601-6)
Equipment/Jig
1) Vectorscope or Oscilloscope (It is recommended that you
use a vectorscope when performing this adjustment.You
can use an oscilloscope instead: Note, however, that the
adjustment accuracy will be lower.)
2) C12 light balance filter
Condition
1) Attach a C12 light balance filter to lens.
2) Point 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 a vectorscope (Figs. 6-5-1, 6-5-2):
Press the D or U key to set the red vector to approx. 240%
of burst vector. Then, while holding down the Ctrl key,
press the D or U key to set the red vector to approx. 240%
± 5% of burst vector.
When using an oscilloscope (Fig. 6-5-3):
Press the D or U key to set the red level on waveform to
approx. 686 mVp-p.
Then, while holding down the Ctrl key, press the D or U
key to set the red level on waveform to approx. 686 mV ±
20 mVp-p.
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.
RED
BURST
100%
Fig. 6-5-1 Chroma Gain
(For VK-S274R)
RED
BURST
240%
± 5%
100%
Fig. 6-5-2 Chroma Gain
(For VK-S274ER)
Adjustment menu
***********************************************************
***********************************************************
Input 3.

Chroma gain adjustment

<< ADJUSTMENT OF CHROMA GAIN >>
[U]
[D]
[Crt] + [U]
[Crt] + [D]
[ENTER]
[ESC]
Press the D or U,
and Cont key to set
the red vector to
240 % ± 5 % of
burst vector, and
press Enter key.
Chroma gain data write
<< ADJUSTMENT OF CHROMA GAIN >>
Chroma gain adjustment complete
<< ADJUSTMENT OF CHROMA GAIN >>
Press any key.
240%
± 5%
6 - 10
ADJUSTMENT
[1]
AUTO IRIS CONTROL
[2]
WHITE BALANCE
[3]
CHROMA GAIN
[ESC] RETURN TO MAIN MENU
Please select [1] - [3] or [ESC]
ROUGH ADJUSTMENT
CHROMA GAIN UP
CHROMA GAIN DOWN
FINE ADJUSTMENT
CHROMA GAIN UP
CHROMA GAIN DOWN
SAVE & RETURN TO MENU
QUIT
DATA WRITING INTO EEPROM
ADJUSTMENT FINISHED
PRESS ANY KEY
Adjustment menu
RED
686mV
± 20mVp-p
Fig. 6-5-3 Chroma Gain

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Vk-k274rVk-s274erVk-k274er