White Balance Adjustment In Service; Input-A - Sony VPL-HS3 Service Manual

2-4. White Balance Adjustment in
Service

2-4-1. INPUT-A

Preparation
1. Check that the initial value of each GAIN and BIAS of
RGB is as follows.
GAIN: 136
BIAS: 85
2. Set the color/color-difference meter as follows.
. Standard
. Lamp Control: LOW
. Iris Control:
ON
Adjustment
1. MID mode of INPUT-A
1. Input WVGA 80IRE Window white (3 colors: RGB)
to INPUT-A.
2. Adjust the GAIN of G of white balance so that the
chromaticity (y80) is within the following
specification.
y80 : 0.310 ± 0.003
3. Set the reference of x80 and y80 as follows.
x80>0.294 : B reference
y80<0.294 : R reference
4. Adjust the GAIN of colors other than the reference
color of white balance so that the chromaticity (x80
and y80) is within the following specification.
x80 : 0.294 ± 0.002
y80 : 0.310 ± 0.003
5. Input WVGA 20IRE Window white (3 colors: RGB)
to INPUT-A.
6. Adjust the BIAS of colors other than G of white
balance so that the chromaticity (x20 and y20) is
within the following specification.
x20 : 0.294 ± 0.002
y20 : 0.310 ± 0.003
7. Repeat steps 1 to 5 and adjust each GAIN and BIAS of
RGB so that x and y are within the following
specification.
x : 0.294 ± 0.002
y : 0.310 ± 0.003
2-10
2. HIGH mode of INPUT-A
1. Input WVGA 80IRE Window white (3 colors: RGB)
to INPUT-A.
2. Set the value of B GAIN as follows.
B GAIN = 140
3. Input WVGA 20IRE Window white (3 colors: RGB)
to INPUT-A.
4. Adjust the BIAS of colors other than G of white
balance so that the chromaticity (x20 and y20) is
within the following specification.
x20 : 0.283 ± 0.002
y20 : 0.297 ± 0.003
5. Input WVGA 80IRE Window white (3 colors: RGB)
to INPUT-A.
6. Adjust the GAIN of colors other than B of white
balance so that the chromaticity (x80 and y80) is
within the following specification.
x80 : 0.283 ± 0.002
y80 : 0.297 ± 0.003
7. Repeat steps 1 to 6 and adjust each GAIN and BIAS of
RGB so that x and y are within the following
specification.
x : 0.283 ± 0.002
y : 0.297 ± 0.003
3. LOW mode of INPUT-A
1. Input WVGA 20IRE Window white (3 colors: RGB)
to INPUT-A.
2. Adjust the BIAS of colors other than G of white
balance so that the chromaticity (x20 and y20) is
within the following specification.
x20 : 0.313 ± 0.002
y20 : 0.329 ± 0.003
3. Input WVGA 80IRE Window white (3 colors: RGB)
to INPUT-A.
Adjust the GAIN of colors other than R of white
balance so that the chromaticity (x80 and y80) is
within the following specification.
x80 : 0.313 ± 0.002
y80 : 0.329 ± 0.003
4. Repeat steps 1 to 3 and adjust each GAIN and BIAS of
RGB so that x and y are within the following
specification.
x : 0.313 ± 0.002
y : 0.329 ± 0.003
VPL-HS3