White Balance (Ntsc) & White Balance (Hd) - Mitsubishi WS-48515 Service Manual

MODELS: WS-48515 / WS-55515 / WS-55615 / WS-55815 / WS-65515 / WS-65615 /WS-65815 / WS-73615
[CRT Circuit]
5. White Balance (NTSC)
Measuring
Instrument
Test Point
------
------
Ext. Trigger
Measuring
------
Range
Input Signal
NTSC White Raster
Input Terminal
RF or Video
CIRCUIT ADJUST MODE
Activate ........ MEN U-2-4-5-7
Function ... ......... .....AUD IO
Item No. ...... ...........VIDEO
Adjus t Data ...........AD JU ST
Save Data .... ......... ENTER
Exit ......... .....MEN U (twice)
[CRT Circuit]
6. White Balance (HD)
Measuring
-----
Instrument
Test Point
-----
Ext. Trigger ------
Measuring
-----
Range
Input Signal
HD White Raster
Input Terminal
Component
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.
Ma x im um CRT Curre nt
W S-48515 W S-55615 W S-65615
CRT
W S-55815 W S-55515 W S-65515
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 Component Inputs.
2. Select the Component 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 original value.
CIRCUIT ADJUST MODE
Activate ........ MEN U-2-4-5-7
Function ... ......... .....AUD IO
Item No. ...... ...........VIDEO
Adjus t Data ...........AD JU ST
Save Data .... ......... ENTER
Exit ......... .....MEN U (twice)
Page 42
580ua
580ua
580ua
W S-65815
W S-73615
900ua
900ua
900ua