White Balance (Hd); 10. Cb, Cr Offset - Mitsubishi Electric WS-48511 Service Manual

MODELS: WS-48511 / WS-55511 / WS-55711 / WS-65511 / WS-65611 / WS-65711 / WS-65712 / WS-73711 / WS-B55
[CRT Circuit]

9. White Balance (HD)

Measuring
-----
Instrument
Test Point
-----
Ext. Trigger ------
Measuring
-----
Range
Input Signal HD White Raster
Input Terminal
DTV Inputs
CIRCUIT ADJUST MODE
Activate ........ MENU-2-1-5-7
Function .................AUDIO
Item No. .................VIDEO
Adjust Data ...........ADJUST
Save Data .... .........ENTER
Exit ..............MENU (twice)
[CRT Circuit]

10. Cb, Cr Offset

Measuring
-----
Instrument
-----
Test Point
------
Ext. Trigger
Measuring
------
Range
Input Signal
White Raster (HD&NTSC)
Input Terminal Video & DTV Inputs
CIRCUIT ADJUST MODE
Activate ........ MENU-2-1-5-7
Function .................AUDIO
Item No. .................VIDEO
Adjust Data ...........ADJUST
Save Data .... .........ENTER
Exit ..............MENU (twice)
Purpose:
To set the CRTs white level in the HD mode.
Symptom:
Monchrome pictures have a color tint.
1. Supply an HD Full White Raster signal to the DTV Inputs.
2. Select the DTV Inputs (Input button)
3. Activate the Adjustment mode, VC Function.
4. Set Item "23 COL" to 0.
5. Adjust Items "6 RDRH" and "8 BDRH" for optimum white at the center of the
screen.
6. Reduce the input signal luminance to 25%.
7. Adjust Items "9 CTRH" and "11 CTBH" for optimum white.
8. Set the data for Item "23 COL" back to 31.
Purpose
To set Cb and Cr color signal level.
Incorrect colors.
Symptom:
1. Supply an NTSC White Raster (25% luminance) signal to a Video Input.
2. Activate the Adjust Mode, VC Function
3. Set Item "23 COL" data to 63.
4. Adjust Items "60 CRO1" and "61 CBO1" for optimum white.
5. Set Item "23 COL" data to 31.
6. Save data and Exit the Service Mode.
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