Mitsubishi MEDALLION WS-55615, Service Manual

Page: 42 / 81

Page 42
Purpose:
Measuring
Instrument
Test Point
Measuring
Range
Input Signal
Ext. Trigger
Input Terminal
Symptom:
Purpose
Measuring
Instrument
Test Point
Measuring
Range
Input Signal
Ext. Trigger
Input Terminal
Symptom:
MODELS: WS-48515 / WS-55515 / WS-55615 / WS-55815 / WS-65515 / WS-65615 /WS-65815 / WS-73615
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NTSC White Raster
RF or Video
[CRT Circuit]
5. White Balance (NTSC)
To set the CRTs white level in the NTSC mode.
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 CTR L” and “ 15 CTBL ” for optimum white.
10. Set the data for Item “ 19 COL ” back to 31 .
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)
To set the CRTs white level in the HD mode.
Monchrome pictures have a color tint.
[CRT Circuit]
6. White Balance (HD)
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HD White Raster
Component
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)
Ma x im um CRT Curre nt
CRT
W S-48515 W S-55615 W S-65615
W S-55815 W S-55515 W S-65515
W S-65815
W S-73615
RED
580ua 900ua
GREEN 580ua 900ua
BLUE
580ua 900ua