Sharp LC-R60HDU Service Manual page 27

3. Adjusting the chromaticity (white-to-white voltage)
(1) Attach the CL100 measuring probe at the center of the screen (using mild-adhesive tape or the like).
(2) Get the adjustment program started. Select [Measure (M)] first and then White Balance (W) (on Screen 1).
(3) On the adjustment program screen, set the output level to 100%.
(4) Select GAMMA on the process adjust menu.
(5) Select G3 (Red linear γ). Select VIDEO2 on the process adjust menu.
(6) Set the R-GAIN data to 255.
(7) Measure the illuminance and enter it in the RED lx box on Screen 1. The 93% illuminance is automatically
calculated.
(8) Adjust the R-GAIN data to achieve the displayed 93% illuminance.
(9) Enter the adjusted gain level in the 1RED box onscreen.
(10) Select GAMMA on the process adjust menu.
(11) Select G2 (Green linear γ).
(12) Select VIDEO2 on the process adjust menu.
(13) Set the G-GAIN data to 255.
(14) Measure the illuminance and enter it in the GREEN lx box on Screen 1. The 93% illuminance is automatically
calculated.
(15) Adjust the G-GAIN data to get the brightness as high as 93% of the measured illuminance.
(16) Enter the adjusted gain level in the 1GREEN box onscreen.
(17) Select GAMMA on the process adjust menu.
(18) Select G1 (Blue linear γ).
(19) Select VIDEO2 on the process adjust menu.
(20) Set the B-GAIN data to 255.
(21) Gradually turn down the gain level to find the peak illuminance.
(22) Enter the gain level of the peak illuminance in the GAIN box.
(23) Measure the illuminance and enter it in the BLUE lx box on Screen 1. The 93% illuminance is automatically
calculated.
(24) Adjust the B-GAIN data to get the brightness as high as 93% of the measured peak illuminance.
(25) Select GAMMA on the process adjust menu.
(26) Select G4 (White linear γ).
(27) Measure the illuminance and chromaticity, and enter them in the WHITE box.
(28) At each gain level, reach the target chromaticity of x = 0.281±0.005 and y = 0.309±0.005.
[Chromaticity adjustment procedure]
The adjustment starts with the 93% gain level and goes on toward lower levels.
Judging the measured chromaticity and the target one, the gain level of one color is fixed first and those of
other two colors are then adjusted.
As the R-GAIN setting is stepped down, the "x" value goes down too.
As the G-GAIN setting is stepped down, the "y" value goes down too.
As the B-GAIN setting is stepped down, both the "x" and "y" values go up.
As shown in the chromaticity adjustment chart, let's suppose the relation between the measured chromatic-
ity and the target chromaticity:
1 If only the "y" value is too high→Turn down the G-GAIN setting with the R-GAIN and B-GAIN settings
fixed.
2 If both the "x" and "y" values are too high→Turn down the R-GAIN and G-GAIN settings with the B-GAIN
setting fixed.
3 If only the "x" value is too high→Turn down the R-GAIN setting with the B-GAIN and G-GAIN settings
fixed.
4 If the "x" value is too high and "y" too low→Turn down the B-GAIN and R-GAIN settings with the G-GAIN
setting fixed.
5 If only the "y" value is too low→Turn down the B-GAIN and R-GAIN settings with the G-GAIN setting
fixed.
6 If both the "x" and "y" values are too low→Turn down the B-GAIN and G-GAIN settings with the R-GAIN
setting fixed.
7 If only the "x" value is too low→Turn down the B-GAIN and G-GAIN settings with the R-GAIN setting
fixed.
8 If the "x" value is too low and "y" too high→Turn down the B-GAIN and G-GAIN settings with the R-GAIN
setting fixed.
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LC-R60HDU