Adjustment Procedures; Main & Sub Y Level Adjustments; Main & Sub Color Level Adjustments - Mitsubishi Electric WD-52327 Service Manual

[Video Circuit]
1. Main/Sub Y Level
Measuring
Oscilloscope
Instrument
JA-22 & JB-3
Test Point
------
Ext. Trigger
Measuring
------
Range
Input Signal Color Bars
Input Terminal
Video Input
CIRCUIT ADJUST MODE
Activate ........ MEN U-5-7-5-7
Function ... ......... .....AUD IO
Item No. ...... ...........VIDEO
Adjus t Data ...........AD JU ST
Save Data .... ......... ENTER
Exit ......... .....MEN U (twice)
[Video Circuit]
2. Main/Sub Color Level
Measuring
Oscilloscope
Instrument
JA-20 & JB-5
Test Point
Ext. Trigger
------
Measuring
200mV/div
Range
20usec/div
Input Signal
Color Bars
Input Terminal
Video Input
MODEL: WD-52327 / WD-62327
Purpose:
To set picture luminance
Symptom:
Excess or insufficient brightness.
1. Supply a color bar signal to a Video Input (not an RF input).
2. Select the color bar signal for both the main and sub pictures.
3. Connect the oscilloscope to connector JA pin 22. (Main-Y)
4. Activate the Adjustment Mode (MENU-5-7-5-7)
5. Select the "MAIN MTRX" function. (AUDIO button)
6. Select adjustment Item "39 SCNT". (VIDEO button)
7. Adjust the data for 0.71 ~ 0.76 Vp-p at JA pin 22.
(If it cannot be adjusted within this range, set to the lower value)
8. Move the oscilloscope to connector JB pin 3. (Sub-y)
9. Select the "SUB MTRX" function. (AUDIO button)
10. Select adjustment Item "39 SCNT". (VIDEO button)
11. Adjust the data to equal the MAIN-Y Gain (+0.0V -0.05V).
12. Press "ENTER" to save data changes.
Purpose:
To set the sub picture color level.
Symptom:
Main and sub pictures color levels differs.
1. Supply a color bar signal to a Video Input.
2. Select the color bar signal as the source for both the main and sub picture.
3. Connect an oscilloscope to connector JA pin 20 (main Cr).
3. Activate the Adjustment mode (MENU-5-7-5-7)
4. Select the "MAIN MTRX" function (AUDIO button).
5. Select adjustment item "41 SCLR" (VIDEO button)
6. Adjust the data for 0.81 ~ 0.86 Vp-p min. at JA pin 20.
(If it cannot be adjusted within this range, set to the lower value).
7. Move the oscilloscope to connector JB pin 5 (sub Cr).
8. Select the "SUB MTRX" function (AUDIO button).
9. Select adjustment item "41 SCLR" (VIDEO button).
10. Adjust data so the Sub Cr amplitude equals that of the Main Cr.
11. Press "ENTER to save data changes.
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