White Balance Adjustment; Signal Level Adjustment - Sony VPL-PX11 Service Manual

2-5. White Balance Adjustment

2-5-1. Signal Level Adjustment

1. Warm up the unit at least 10 minutes.
2. Connect the 2-step signal that consists of 95 IRE and
100 IRE amplitude, to the INPUT-A connector.
Then enter the Service mode.
Press the keys in the following order.
"ENTER"→"ENTER"→"↑"→"↓"→"ENTER"
The message "Do you wish to enter into the SERVICE
MODE? Yes : ↑ No : ↓ "will be displayed.
Select "Yes : ↑".
n
When leaving the SERVICE MODE, perform the key
operations of item 2, "Do you wish to return to the
USER MODE? Yes : ↑ No : ↓ "will be displayed.
Select "Yes : ↑".
3. Set the unit in G-only mode.
4. Enter the P.DRV on the MENU screen by the DEV.
ADJ.
5. Discriminate the 95 IRE and 100 IRE by the V-AMP/
CONT controls of the P.DRV.
6. Set the unit in R-only mode.
7. Discriminate the 95 IRE and 100 IRE by the V-AMP/
SUB CONT R controls of the P.DRV.
8. Set the unit in B-only mode.
9. Discriminate the 95 IRE and 100 IRE by the V-AMP/
SUB CONT B controls of the P.DRV.
2-8
2-5-2. White Balance Adjustment
1) HIGH Mode of INPUT-A
Input the 10 STEP signal to INPUT-A, and observe the
chromaticity of each luminance.
When varying the chromaticity of each luminance, perform
the following adjustments.
1. Input the 100 IRE FLAT FIELD signal to INPUT-A.
2. Measure the chromaticity (x, y).
3. Input the 50 IRE FLAT FIELD signal to INPUT-A.
4. Adjust the chromaticity (x, y) to the values measured
in step 2 by the V-AMP/SUB CONT R and B of the P.
DRV.
2) LOW Mode of INPUT-A
1. Input the 50 IRE FLAT FIELD signal to INPUT-A.
2. Select BIAS 123 using the LOW mode of W/B.
3. Adjust GAIN G so that chromacity becomes 0.322 ±
0.003.
3) LOW Mode of VIDEO
1. Input the 50 IRE 15k COMPONENT FLAT FIELD
signal to INPUT-A.
2. Select BIAS 123 using the LOW mode of W/B.
3. Adjust GAIN G so that chromacity becomes 0.322 ±
0.003.
VPL-PX11