Video Adjustments - Mitsubishi VS-60609 Service Manual

MODELS: VS-45609 / VS-50609 / VS-55609 / VS-60609 / VS-60719 / VS-70709
[CRT Circuit]
9. White Balance
(Low Color Temperature)
Measuring
--------
Instrument
Test Point
--------
Ext. Trigger
------
Measuring
-------
Range
Input Signal
Full White Raster
Input Terminal
Video Input
SERVICE MODE
Activate ........ MENU-0-1-5-7
Function .................AUDIO
Item No. .................VIDEO
Adjus t Data ...........ADJUST
Save Data .... .........ENTER
Exit ..............MENU (twice)
[Video Circuit]
10. Black Level
Measuring
--------
Instrument
Test Point
--------
Ext. Trigger
------
Measuring
-------
Range
Input Signal Monoscope
Input Terminal
Video Input
SERVICE MODE
Activate ........ MENU-0-1-5-7
Function .................AUDIO
Item No. .................VIDEO
Adjust Data ...........ADJUST
Save Data .... .........ENTER
Exit ..............MENU (twice)
Purpose: To set the CRTs white level at Low Color Temperature.
Symptom: Monchrome has a color tint.
Note: This adjustment should be performed after the High temperature White
Balance Adjustment.
Low Color Temperature White Balance
1. Supply a Full White Raster signal to the Video Input.
2. Enter the Service Mode, VCJ Function.
3. Adjust Item "17 RDRL" and "18 BDRL" for optimum white at the center of the
picture.
Note: If the Cutoff level changes during the adjustment, use Items "14 CTRL"
and "16 CTBL" to touch up the Cutoff level. Then readjust "RFRL" and
"BDRL".
4. Save data and exit the Service Mode.
Purpose: To set black level of the picture.
Symptom:
Excessive or insufficient contrast.
Note: This adjustment should be performed after the Cutoff and White Balance
Adjustments.
1. Supply a Monoscope signal to the Video Input.
2. Enter the Service Mode, VCJ Function.
3. Adjust Item "7 BRTH" so the 0% and 10% gradation levels on the Mono-
scope pattern are the same. (Data should be within 31 ±4 range)
4. Save the data and exit the Service Mode.
40% 30% 20% 10%
50% 0% 0% 0%
60% 70% 80% 90%
GRADATION SCALE
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