White Balance Adjustment; High Mode Of Input-A; Low Mode Of Input-A; High Mode Of Video - Sony VPL-CS5A Service Manual

2-5. White Balance Adjustment

Preparation before adjustment
1. Input the 100 IRE flat field signal to the INPUT-A
connector and allow the warm-up of 10 minutes aging
at a minimum.
2. Enter the Service Mode.
Press the keys in the following order.
[ENTER] → [ENTER] → ↑ → ↓ → [ENTER].
The message [Do you want to enter the Service Mode?
Yes : ↑ No : ↓] appears.
Select [Yes : ↑].
[Supplementary information: How to Exit the
Service Mode]
Perform the step 2 KEY operation.
The message [Do you want to return to the User Mode?]
appears.
Select [Yes : ↑].

2-5-1. HIGH Mode of INPUT-A

Connect the10-step signal to the INPUT-A connector and
measure the chromaticities at each brightness.
If chromaticities are different at each brightness, perform
the following adjustment.
1. Input the 100 IRE flat field signal to the INPUT-A
connector.
2. Measure the chromaticity (x, y).
3. Input the 80 IRE flat field signal.
4. Adjust the GAIN R and GAIN B in the HIGH mode of
W/B until the chromaticity (x, y) that is measured at
step 2 is obtained.
5. Input the 30 IRE flat field signal.
6. Adjust the BIAS R and BIAS B in the HIGH mode of
W/B until the chromaticity (x, y) that is measured at
step 2 is obtained.
7. Repeat steps 3 to 6 until the chromaticity (x ± 0.002, y
± 0.004) with reference to the chromaticity (x, y) that
is measured at step 2 is obtained.

2-5-2. LOW Mode of INPUT-A

1. Input the 80 IRE flat field signal to the INPUT-A
connector.
2-12
2. In the LOW mode of W/B, adjust the GAIN R for +15
higher than the value in the HIGH mode, adjust the
GAIN G for _ _ _ _ _ 25 lower than the value in the HIGH
mode and adjust GAIN B that is the same as the value
in the HIGH mode.
3. Adjust BIAS R, BIAS B and BIAS G for the same
value as those of the HIGH mode.
4. Measure the chromaticity (x, y).
5. Input the 30 IRE flat field signal.
6. Adjust the BIAS R and BIAS B in the LOW mode of
W/B until the chromaticity (x, y) that is measured at
step 4 is obtained.
7. Input the 80 IRE flat field signal.
8. Adjust the GAIN R and GAIN B in the LOW mode of
W/B until the chromaticity (x, y) that is measured at
step 4 is obtained.
9. Repeat steps 5 to 8 until the chromaticity (x ± 0.002, y
± 0.004) with reference to the chromaticity (x, y) that
is measured at step 4 is obtained.

2-5-3. HIGH Mode of VIDEO

1. Input the NTSC or PAL video signal to the input
connector.
2. In the HIGH mode of W/B, adjust the GAIN R for
_ _ _ _ _ 20 lower than the value in the INPUT-A HIGH
mode, adjust the GAIN G for _ _ _ _ _ 35 lower than the value
in the INPUT-A HIGH mode and adjust GAIN B that
is the _ _ _ _ _ 20 lower than the value in the INPUT-A HIGH
mode.
3. Adjust BIAS G for _ _ _ _ _ 5 lower than the value in the
INPUT-A HIGH mode, adjust the BIAS R and BIAS
B for the same value as those of the INPUT-A HIGH
mode.

2-5-4. LOW Mode of VIDEO

1. Input the NTSC or PAL video signal to the input
connector.
2. In the LOW mode of W/B, adjust the GAIN R for _ _ _ _ _ 20
lower than the value in the INPUT-A LOW mode,
adjust the GAIN G for _ _ _ _ _ 35 lower than the value in the
INPUT-A LOW mode and adjust GAIN B that is the
_ _ _ _ _ 20 lower than the value in the INPUT-A LOW mode.
3. Adjust BIAS G for _ _ _ _ _ 5 lower than the value in the
INPUT-A LOW mode, adjust the BIAS R and BIAS B
for the same value as those of the INPUT-A HIGH
mode.
VPL-CS5A/CS6/CX6/EX1