Hitachi VM-8480LE Service Manual page 17

(2) Matrix Adjustment (Fig. 3-3)
Purpose:
To compensate for uneveness in the chroma signal.
incompleted Phenomenon:
Color reproduction becomes defective.
Equipment/Jig:
Oscilloscope
Test Point:
Video Out (AV OUT)
Condition:
Point at a color bar chart.
Procedure:
ADJUSTMENT MENU
ADJUSTMENT
FEO a OIG AGO ICIS AG IGIAC ICI a III I i ROKK ACH 8 ACC ek He
(2) MATRIX
Please select [1}- {4] or [ESC]
Press 2 key.
« ADJUSTMENT OF BLUE MATRIX »
ROUGH ADJUSTMENT
{U] UP
ID]
DOWN
FINE ADJUSTMENT
[Ctrl] + (U] UP
(Ctrl] + [D] DOWN
{ENTER] RETURN TO MENU
[ESC] QUIT
levels is 1:2.
DATA WRITING TO EEPROM
« ADJUSTMENT OF BLUM MATRIX »
« ADJUSTMENT OF BLUE MATRIX »
ADJUSTMENT FINISHED
PRESS ANY KEY
Press any key to return to ADJUSTMENT MENU display.
YEL BLU
YLE: BLU
1:2
Fig. 3-3
-~
(3) White Balance Adjustment
Purpose:
To set white balance under the color temperature which
becomes a reference for the auto white balance circuit.
incompleted Phenomenon:
Color of the subject is different from that of the picture.
A white subject is not seen as white.
Test Point:
Video Out (AV OUT)
Condition:
Attach a C12 filter.
Point at a gray scale chart (at wide-angle).
Procedure:
ADJUSTMENT MENU
ADJUSTMENT
[3] WHITE BALANCE
Please select. [1]- [4] or [ESC]
Press 3 key.
Press 0(ZERO) 0(ZERO) to input the data.
« WHITE BALANCE ADJUSTMENT »
INPUT DATA OF OFFSET
FOR Mg-G --> 00
(4) Chroma Gain Adjustment (Figs. 3-4, 3-5)
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.
Equipmeni/Jig:
Oscilloscope (Vectorscope)
Test Point:
Video Out (AV OUT)
Condition:
Attach a C12 filter.
Point at a color bar chart.
Procedure:
ADJUSTMENT MENU'
RS Ee SOR CII
OR ACA OK 9 so 2 oS 2 2 Ce oo
fe fe a i a IC ak OR Oo a
ADJUSTMENT
[4] CHROMA GAIN
[ESC]
RETURN TO MAIN MENU
Please select [1]- [4] or [ESC]
Press 4 key.
ROUGH ADJUSTMENT
{U]
CHROMA GAIN UP
[D}
CHROMA GAIN DOWN
FINE ADJUSTMENT
WhenUsing an Oscilloscope:
(Fig. 3-4)
When Using a Vectorscope;