Electrical Adjustments; Preparations; Equipment Required; Factory Mode Setting - Sony VPL-HS20 Service Manual

2-1. Preparations

2-1-1. 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)
VG854 or equivalent
. Digital voltmeter
Advantest TR6845 or equivalent
. Luminance meter
. Chrominance difference gauge
n
Perform the following adjustments at least 5 minutes after
turning on the power.

2-1-2. Factory Mode Setting

1. Make sure that the MENU is indicated.
2. Exit the menu.
3. Press the keys in the following order:
"ENTER" → "ENTER" → "LEFT" → "ENTER"
4. The message "Do you wish to enter into the
FACTORY MODE? Yes:↑ No:↓ " will be displayed.
5. Select "Yes:↑".
n
. When leaving the FACTORY MODE, perform item 3.
"Do you wish to return to the USER MODE? Yes:↑ No:↓
" will be displayed. Select "Yes:↑".
. Cannot enter FACTORY MODE by MS channel.
VPL-HS20
Section 2

Electrical Adjustments

2-2. V COM Adjustment
1. Input the green-only XGA 1 Lime ON/OFF signal to
INPUT-A, and set the CONTRAST to 70.
2. Set the screen to G VCOM adjustment of "Device
Adjust."
3. Adjust the G VCOM so that the flicker on the screen is
minimum.
4. Change the input signal to the red-only and blue-only
1 line ON/OFF signal respectively and adjust R
VCOM and B VCOM respectively so that the flicker
becomes minimum as described in step 3.
5. Save the value adjusted.
6. Set the "Image Flip" to either "V" or "HV".
7. Input the R/G/B value adjusted as above step 5.
8. Save the value adjusted.
9. Set the "Image Flip" to "OFF".
2-1