White Balance (Ntsc) & White Balance (Hd) - Mitsubishi Electric WS-73513 Service Manual

MODELS: WS-48513 / WS-48613 / WS-55513 / WS-55613 / WS-55813 / WS-65513 / WS-65613 / WS-65713 /
WS-65813 / WS-73513 / WS-73713
[CRT Circuit]
5. White Balance (NTSC)
Measuring
DC ma meter
Instrument
Test Point
------
Ext. Trigger ------
Measuring
------
Range
Input Signal
NTSC White Raster
Input Terminal
RF or Video
CIRCUIT ADJUST MODE
Activate ........ MENU-0-3-5-7
Function .................AUDIO
Ite m N o . .................VIDEO
Adjus t Data ...........ADJUST
Save Data .... .........ENTER
Exit ..............MENU (twice)
[CRT Circuit]
6. 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-0-3-5-7
Function .................AUDIO
Ite m N o . .................VIDEO
Adjus t Data ...........ADJUST
Save Data .... .........ENTER
Exit ..............MENU (twice)
Purpose:
To set the CRTs white level in the NTSC mode.
Symptom:
Monochrome has a color tint.
Note: Use the "FORMAT" button to activate the Expand mode (full screen).
1. Supply a full White Raster Signal
2. Activate the Service Mode, VC function.
3. Adjust Items "4 RDRH" and "6 BDRH" for optimum white at the center of
the screen.
4. Reduce the input luminance level to 25%.
5. Adjust Items "7 CTRH" and "9 CTBH" for optimum white.
6. Insert a Milliammeter in series with each CRT Cathode. The maximum
allowable current for each CRT is given in the table below.
7. Set the white raster to 100% and adjust Items "10 RDRL" and "12 BDRL" for
optimum white at the center of the screen.
8. Reduce the luminance level to 25%.
9. Adjust Item "13 CTRL" and "15 CTBL" for optimum white.
10. Set the data for Item "19 COL" back to 31.
Maximum CRT Current
WS-48513 WS-55613 WS-65613
CRT WS-48613 WS-55813 WS-65713
WS-55513 WS-65513
RED
GREEN
BLUE
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 "19 COL" to 0.
5. Adjust Items "4 RDRH" and "6 BDRH" for optimum white at the center of the
screen.
6. Reduce the input signal luminance to 25%.
7. Adjust Items "7 CTRH" and "9 CTBH" for optimum white.
8. Set the data for Item "19 COL" back to 31.
Page 44
580ua
580ua
580ua
WS-65813
WS-73513
WS-73713
900ua
900ua
900ua