Service Know-How; When The Prism Block Is Replaced; When The C Board Is Replaced; White Balance Adjustment - Sony VPL-PX35 Service Manual

2-4. Service Know-How

2-4-1. When the Prism Block Is Replaced

1. Perform the V COM adjustment. (Refer to Section "2-
2. VCOM Adjustment".)
2. Write the GAMMA data of the prism block.
3. Perform the white balance adjustment. (Refer to
Section "2-5. White Balance Adjustment".)

2-4-2. When the C Board Is Replaced

n
If any board other than the C board is replaced, there is not
adjustment item.
1. Install IC706 of the C board before replacement, into
the new C board.
2. Enter the Factory Mode.
3. Perform the V COM adjustment. (Refer to Section "2-
2. VCOM Adjustment".)
4. If the white balance is significantly poor, perform the
white balance adjustment. . (Refer to Section "2-5.

White Balance Adjustment".)

VPL-PX35/PX40
2-5. White Balance Adjustment
Preparation before adjustment
1. Input the 100 IRE flat field signal to the INPUT-D
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?
Yes : ↑ No : ↓] appears.
Select [Yes : ↑].

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

Connect the10-step signal to the INPUT-D 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-D
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.
2-9