Wide Zoom Mode Geometry Adjustment - Sony TRINITRON KD-34XBR2 Service Manual

4-4. WIDE ZOOM MODE GEOMETRY
ADJUSTMENT
NOTE: The WIDE ZOOM mode deliberately compresses the picture areas near the top
and bottom of the screen, and stretches the picture areas at the sides of the screen.
Images in the center area of the screen are neither stretched nor compressed, so they
appear natural. The WIDE ZOOM mode allows the viewer to see natural images in the
center of the screen where the viewer's attention is usually focused, while at the same
time allowing the images to fi ll the entire screen area.
A properly adjusted WIDE ZOOM mode will look similar to the drawing below.
Center area aspect ratio is
preserved.
SET-UP CONDITION:
Display Mode: WIDE ZOOM
Picture mode: STANDARD (select the STANDARD mode from the user
menu, then press the RESET button on the remote control to set the
STANDARD settings to the factory settings).
TILT CORRECTION: set to zero (from the user menu).
VERTICAL CORRECTION: set to zero (from the user menu).
NOTE: The WIDE ZOOM mode shares a few of the adjustments made in the FULL mode.
As a rule you should not have to make any of the shared adjustments in WIDE ZOOM
mode. Only the adjustments listed below are necessary.
PROCEDURE:
1. Enter the service mode.
2. Display the monoscope or cross-hatch pattern.
3. Adjust the vertical s-correction and the horizontal linearity so that the
boxes in the general center area of the screen have the same height
and width.
Device Name Adj. Item #
2150D-1 4
2150D-2 3
Top and bottom
compressed.
Name Data
VSCO 9 -11 *
SLIN 9 -11 *
— 21 —
* Adjust so that the top and bottom boxes are the same height. The data
must be between 9 and 11!
No good.
OK. A = B
4. Distort the vertical linearity.
Device Name Adj. Item #
2150D-1 3
* Adjust so that the height of the top and bottom boxes are about 90% of
the height of the center boxes
Center Boxes
5. Write the data to memory.
6. Adjust the horizontal size.
Device Name Adj. Item #
2150D-2 2
* Adjust to meet the following spec.:
Monoscope pattern: 15.6 boxes.
Cross-hatch pattern: 92% of the full pattern width.
Monoscope Pattern
15.6 boxes
(monoscope pattern only!)
7. Write the data to memory.
8. Adjust the pattern so that it is centered on the screen vertically.
A
No good.
B
Name Data
VLIN *
0.9A
A
Top and Bottom
Boxes
Name Data
HSIZ *
KD-34XBR2