White Balance Adjustment; High Mode Of Input-A; Low Mode Of Input-A; High Mode Of Video - Sony VPL-CX70 Service Manual

2-5. White Balance Adjustment

Preparation before adjustment
1. Input the 100 IRE XGA 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

Input the XGA 10 STEP signal to the INPUT-A connector,
and see the chromaticity of each tone.
If the chromaticity of each mode deviates, perform the
following adjustment.
Before adjusting each mode, confirm that CONTRAST is
80, BRIGHT is 50, GAIN of R.G.B is 152, and BIAS is
127.
Select Computer for the Input-A signal type.
1. Input the 100 IRE XGA flat field signal to the INPUT-
A connector.
2. Measure the chromaticity (x, y). Set CONTRAST and
BRIGHT to MAX only during this measurement. After
the adjustment is completed, set CONTRAST to 80,
and BRIGHT to 50.
3. Input the 80 IRE XGA flat field signal to the INPUT-
A connector.
4. Adjust the chromaticity (x, y) to the one set in step 2
by GAIN R and GAIN B of the HIGH mode of W/B.
5. Input the 30 IRE XGA flat field signal to the INPUT-
A connector.
6. Adjust the chromaticity (x, y) to the one set in step 2
by GAIN R and GAIN B of the HIGH mode of W/B.
7. Repeat steps 3 to 6 above until the chromaticity (x
± 0.002, y ±0.003) with reference to the chromaticity
that is measured at step 2 is obtained.
8. Press the MEMORY key and save the adjustment value.
VPL-CX70/CX75

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

1. The target chromaticity of the adjustment is (0.327,
0.362).
2. Input the 80 IRE XGA flat field signal to the INPUT-
A connector.
3. Adjust the GAIN R and GAIN B in the LOW mode of
W/B until the chromaticity (x, y) that is measured at
step 1 is obtained.
4. Input the 30 IRE XGA flat field signal to the INPUT-
A connector.
5. Adjust the GAIN R and GAIN B in the LOW mode of
W/B until the chromaticity (x, y) that is measured at
step 1 is obtained.
6. Repeat steps 2 to 5 above until the chromaticity (x
±0.002, y ±0.003) with reference to the chromaticity
that is measured at step 1 is obtained.
7. Press the MEMORY key and save the adjustment value.

2-5-3. HIGH Mode of VIDEO

Set Component for the input A signal type.
1. The target chromaticity of the adjustment is (0.293,
0.295).
2. Input the 80 IRE Component flat field signal to the
INPUT-A connector.
3. Adjust the GAIN R and GAIN B in the LOW mode of
W/B until the chromaticity (x, y) that is measured at
step 1 is obtained.
4. Input the 30 IRE Component flat field signal to the
INPUT-A connector.
5. Adjust the GAIN R and GAIN B in the HIGH mode of
W/B until the chromaticity (x, y) that is measured at
step 1 is obtained.
6. Repeat steps 2 to 5 above until the chromaticity (x
± 0.002, y ± 0.003) with reference to the chromaticity
that is measured at step 1 is obtained.
7. Press the MEMORY key and save the adjustment value.

2-5-4. LOW Mode of VIDEO

1. The target chromaticity of the adjustment is (0.300,
0.310).
2. Input the 80 IRE Component flat field signal to the
INPUT-A connector.
3. Adjust the GAIN R and GAIN B in the LOW mode of
W/B until the chromaticity (x, y) that is measured at
step 1 is obtained.
4. Input the 30 IRE Component flat field signal to the
INPUT-A connector.
5. Adjust the GAIN R and GAIN B in the HIGH mode of
W/B until the chromaticity (x, y) that is measured at
step 1 is obtained.
6. Repeat steps 2 to 5 above until the chromaticity (x
±0.002, y ±0.003) with reference to the chromaticity
that is measured at step 1 is obtained.
7. Press the MEMORY key and save the adjustment value.
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