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4-3-4. Adjustment of the white balance.
Use Minolta CL-100 at measurement and adjustment.
1. Low brightness white balance.
a. Input gray pattern at 0.21Vp-p with a timing signal
of XGA VESA(60).
b. Adjust DAC_P - SUB BRIGHT - R and DAC_P -
SUB BRIGHT - B so that the chromaticity at the
center of the picture is
x=0.28
0.005,y=0.34
white balance)
2. Medium brightness white balance.
a. Input gray pattern at 0.52Vpp with a timing signal
of XGA VESA(60).
b. Adjust DAC_P - SUB CONTRAST - R and DAC_P
- SUB CONTRAST - B so that the chromaticity at
the center of the picture is
x=0.28
0.005,y=0.345
white balance)
3. Return to 1 to check low-brightness white balance,
and repeat 1 to 2 until both middle-brightness and
low-brightness white balance are adjusted within
their target at the same time.
4. Black white balance.
a. Input gray pattern at 0.07Vpp with a timing signal
of XGA VESA(60).
4 - 4 Ghost adjustment
Preparations for adjustment
1. Input a 0.7Vpp cross-hatch pattern with a timing
signal of XGA VESA(60).
2. Adjust "H.PHASE" in the picture menu so that the
vertical lines of cross-hatch pattern are seen
clearest.
0.005(low-brightness
0.005(middle-brightness
b. Adjust DAC_P - BLACK POSI - R and DAC_P -
BLACK POSI - B so that the chromaticity at the
center of the picture is
x=0.27
0.005,y=0.34
5. Compare the brightness between the darkest
stepsand the 2nd darkest one visually. Unless the
difference is visible, go to the procedure a - d below.
a. Input a 0.7Vpp 16 steps primary blue signal with a
timing signal of XGA VESA(60).
b. Adjust DAC_P - BLACK2 POSI - B so that the
brightness between 1st and 2nd step is different
slightly. (See Fig. 4-5.)
c. Input a 0.7Vpp 16 steps primary red signal with a
timing signal of XGA VESA(60).
d. Adjust DAC_P - BLACK2 POSI - R so that the
brightness between 1st and 2nd step is different
slightly. (See Fig. 4-5.)
6. Repeat the procedure 1 to 4 so that the low-
brightness white balance, the medium-brightness
white balance and the black white balance are
within their targets at the same time.
Remark; You don't need to take care of the target
of the black white balance, when it has
been adjusted visually in the procedure 5.
Adjustment procedure
1. Position the cursor on S/H - GHOST in the
ADJUSTMENT menu and push the RESET button
to initialize this parameter.
2. Decrease the value of the S/H - GHOST in the
ADJUSTMENT menu until the ghost image
appears. Suppose this figure "B". (See the example
below.)
3. Set the parameter to "B + 2".
Example:
Adjusted value
6
5
4
In this case, S/H - GHOST is set to 7 (=5+2).
– 12 –
0.005.
Image
No ghost
Faint ghost
B=5
Ghost
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