Electrical Adjustments; Equipment Required; Preparations; Turning On The Power - Sony VPL-PX20 Service Manual

4-1. Equipment Required

. Oscilloscope
Tektronix 2465 or equivalent
(bandwidth: 350 MHz or more)
. NTSC, PAL, SECAM component signal generator
Tektronix TG2000 + AVG1 (optional module)
+AWVG1 (optional module) or equivalent
. VG (Programmable video signal generator)
VG814 or equivalent
. Digital voltmeter
Advantest TR6845 or equivalent
. Luminance meter
Note: Perform the following adjustments at least 5
minutes after turning on the power.

4-2. Preparations

4-2-1. Turning on the Power

1. Connect the power cord and supply the power to the
unit.
2. Check that the STANDBY LED of the control panel
lights up in red.

4-2-2. Setting the Factory Mode

1. Check that the STATUS in the menu is ON.
2. Exit the Menu.
3. Press the keys in the following order:
"ENTER" → "ENTER" → "LEFT" → "ENTER".
The message "Do you with to enter into the FACTORY
MODE?" will be displayed.
Select YES on the menu to set the unit into the factory
mode.
VPL-PX20/PX30
Section 4

Electrical Adjustments

4-3. C Board Adjustments

4-3-1. R VCOM Adjustments

Turn off the menu using the STATUS OFF during adjustments.
(No shield is required.)
1. Enter the R DRV of the device adjust by the factory
mode and check the 1 line ON/OFF signal.
2. Adjust the ← and → keys to minimize the flicker.

4-3-2. G VCOM Adjustments

1. Enter the G DRV of the device adjust by the factory
mode and check the 1 line ON/OFF signal.
2. Adjust the ← and → keys to minimize the flicker.

4-3-3. B VCOM Adjustments

1. Enter the B DRV of the device adjust by the factory
mode and check the 1 line ON/OFF signal.
2. Adjust the ← and → keys to minimize the flicker.

4-4. Signal Level Adjustments

4-4-1. Component Level Adjustments

1. Connect the component signal to INPUT-A (5BNC),
and select COMPONENT with SIGNAL SELECT.
(15K Component color bar Chroma ON)
2. Set the COLOR to 40.
3. Connect the oscilloscope to TP612 (B OUT) on the C
board.
4. Enter the OTHER of the device adjust of the menu.
5. Set 06 3D GAMMA/THROUGH: 0 to 06 3D
GAMMA/THROUGH: 1.
6. Set 07 3D GAMMA/SW: 1 to 07 3D GAMMA/SW: 0
7. Adjust the cursor at the top of the oscilloscope to the
bar on the left side (white section).
8. Adjust GND level to the bottom edge in the DC 0.5 V
range.
9. Set the input signal to component color bar.
10. Select 12 YUV COL. Adjust the ← and → keys so
that the levels of the right bar and the left bar become
the same.
11. Select 05 SUB HUE. Adjust the ← and → keys so that
the two bars at the center become flat.
4-1