Sony VPH-G90E, Service Manual

Page: 88 / 546

1-78
VPH-G90E/G90U/G90M
94
Adjustments
Adjustments
Adjusting the Registration
Notes
• The center of the screen and the center of the CROSS HAIR pattern can
be aligned by performing the centering adjustment.
For details, see “Green CENT (centering) adjustment” on page 95.
• When the optical axis angle is smaller, the HATCH pattern becomes
trapezoidal. Perform the KEY (keystone) adjustment to correct the
distortion.
For details, see “Green KEY and PIN adjustments for the whole screen” on
page 100.
Keys for Adjusting
Indications on the REGISTRATION keys and the adjustment
items
REGISTRATION
(CENT/SIZE/LIN/SKEW/BOW/KEY/
PIN/ZONE) keys
PATTERN key
NORMAL key
BLKG key
RESET key
Arrow ( B / b / V / v ) keys
PO/– keys
CUT OFF R/G/B keys
ADJ R/G/B keys
PO/– keys
Indicated on the commander Adjustment Items
CENT Centering
SIZE Size
LIN Linearity
SKEW Skew
BOW Bow
KEY Keystone
PIN Pincushion
ZONE Zone
SELECT
VIDEO MEMORY
SWITCHER INDEX
PIC ON AUDIO OFF
PATTERN FOCUS ZOOM SHIFT
NORMAL
MUTING STATUS
LCD LENS CONTROL
ON
COMMAND
OFF
SIZE DOT PHASE
APA
SHIFT
RGB
R
B
CENT
ON STANDBY
MEMORY MENU
VIDEO
INPUT SELECT
A D B C
BLKG SYS SET RESET FUNCTION
1 4 2 3
5 8 6 7
9 10/0(ALL)
SW NO/
OFF/GROUP
SWITCHER/VIDEO MEMORY/INDEX
ENTER
POSITION BRIGHT CONTR
PICTURE CONTROL
HUE COLOR SHARP VOL
VIDEO/S VIDEO
LIGHT
R G
CENT SIZE
CUT OFF
B
LIN
R G
ADJ
B BIAS GAIN
W/B
MG FOCUS LENS
FOCUS
SKEW BOW
REGISTRATION
KEY PIN ZONE
POSITION
Adjustments
95
Adjustments
Adjusting the Green Registration
Be sure to adjust the green registration first.
1
Green CENT (centering) adjustment
Adjust so that the center of the test pattern is aligned with the center of the
screen.
1
Press the CENT key.
The CROSS HAIR pattern and the cursor appear.
2
Press the ADJ G key.
3
Press the CUT OFF R and B keys to display green only.
4
Reset the FINE centering data.
See “Resetting the Data” on page 138.
5
Press the arrow keys to align the center of the CROSS HAIR pattern
with the center of the screen.
C E N T A D J
- G - C O A R S E
H c : [ 1 2 8 ]
H f : 1 2 8
V c : 1 2 8
V f : 1 2 8
ADJ:
6
If the test pattern is not aligned with the center, press the CENT key
again.
The projector enters the FINE centering mode for fine adjustment.
Each time you press the CENT key, the COARSE mode and FINE
mode are selected alternately, and you can use the two modes
appropriately. The adjustment data is stored for each mode separately.
While you hold down the arrow key in the FINE mode, “f” is displayed
around the adjustment position.
7
Press the arrow keys to align the center precisely.
Notes
• If the test pattern is off-centered by a large amount, check if the projector
is installed or adjusted correctly.
• If the upper, lower, left or right part of the screen is de-focused, check if
the scheimpflug is adjusted correctly.
For details, see “Adjusting the green scheimpflug” on page 83.