Panasonic TH-50PC77U, Service Manual, Page: 35 / 112

12 Adjustment
12.1. White balance adjustment
Name of measuring instrument Connection Remarks
· · · · W/B pattern
· · · · Color analyzer
(Minolta CA-100 or equivalent)
Component input
Panel surface
Procedure Remarks
· · · · Ensure aging is adequate.
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Make sure the front panel to be used on the final set is fitted.
· · · · Make sure a color signal is not being shown before adjustment.
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Put the color analyzer where there is little color variation.
1. Output a white balance pattern.
2. Check that the color temperature is “Cool”.
3. Set to serviceman mode, WB-ADJ.
4. Set “R-CUT” “G-CUT” “B-CUT” the values written in table 1.
5. Attach the sensor of color analyzer to he center of highlight window.
6. Fix G drive at C0h and adjust “B-DRV” and “R-DRV” so x, y value of color analyzer
become the “Color temperature High” in table 2.
7. Increase RGB together so the maximum drive value in RGB becomes FCh. That is,
set “ALL DRIVE” to FCh.
8. Set color temperature to “Normal”.
9. Set “R-CUT” “G-CUT” “B-CUT” the values written in table 1.
10. Attach the sensor of color analyzer to the center of highlight window.
11. Fix G drive at C0h and adjust “B-DRV” and “R-DRV” so x, y value of color analyzer
become the “Color temperature Mid” in table 2.
12. Increase RGB together so the maximum drive value in RGB becomes FCh. That is,
set “ALL DRIVE” to FCh.
13. Set color temperature to “Warm”.
14. Set “R-CUT” “G-CUT” “B-CUT” the values written in table 1.
15. Attach the sensor of color analyzer to the center of highlight window.
16. Fix G drive at C0h and adjust “B-DRV” and “R-DRV” so x, y value of color analyzer
become the “Color temperature Low” in table 2.
17. Increase RGB together so the maximum drive value in RGB becomes FCh. That is,
set “ALL DRIVE” to FCh.
18. Set color temperature to “Cool”.
[ adjustment of “Normal” “Warm” by data shift from “Cool” adjust. ]
For “Normal” “Warm” adjustment, set values that the adjusted value of “Cool”
plus the figures wrote below.
19. Copy values adjusted by HD pattern to the NTSC data area of EEPROM.
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TH-50PX77U / TH-50PE77U