Chroma Gain Adjustment - Hitachi VK-U174 Service Manual

Color video camera

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Table Of Contents

Table of Contents

Adjustment > Adjustment (Camera Adjustment)

6-5-3 Chroma gain adjustment (Figs. 6-5-1, 6-5-2, 6-5-3)

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 (PG3501-6)

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 For VK-U174

RED

BURST

240%

± 5%

100%

Fig. 6-5-2 For VK-U174E

Adjustment menu

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Input 3.