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8.3.5
Geometry
The geometry alignments menu contains several items to align
the set, in order to obtain correct picture geometry.
Geometry
1
2
3
4
5
6
7
Figure 8-5
Connect an external video pattern generator to the aerial input
of the TV-set and input a crosshatch test pattern. Set the
generator amplitude to at least 1 mV and set frequency to
475.25 MHz (PAL/SECAM) or 61.25 MHz (NTSC).
1. Activate the SDAM menu (see chapter 5).
2. Go to the GEOMETRY sub menu.
Now you can perform the following alignments:
•
Horizontal Parallelogram (HP)
Align straight vertical lines in the top and the bottom;
vertical rotation around the centre.
•
Horizontal Bow (HB)
Align straight horizontal lines in the top and the bottom;
horizontal rotation around the centre.
•
Horizontal Shift (HS)
Align the horizontal centre of the picture to the horizontal
centre of the CRT.
•
Vertical Slope (VS)
Align the vertical centre of the picture to the vertical centre
of the CRT. This is the first of the vertical alignments to
perform. For an easy alignment, set SBL to ON.
•
Vertical Amplitude (VA)
Align the vertical amplitude so that the complete test
pattern is visible.
•
Vertical S-Correction (SC)
Align the vertical linearity, meaning that vertical intervals of
a grid pattern must be equal over the entire screen height.
•
Vertical Shift (VSH)
Align the vertical centring so that the test pattern is located
vertically in the middle. Repeat the 'vertical amplitude'
alignment if necessary.
•
Service Blanking (SBL)
Switch the blanking of the lower half of the screen ON or
OFF (to be used in combination with the vertical slope
alignment).
For EW versions
•
Set Horizontal Parallelogram to prevent the picture from
slanting to one side.
•
Set Horizontal Bow to prevent the top and bottom of
picture from bending to the sides.
Alignments
VERT. SLOPE
VERT. SHIFT
VERT. AMPLITUDE
V.S-CORRECTION
HOR. SHIFT
HOR. PARALLELOGRAM
HOR. BOW
CL 16532108_015.eps
310801
L01H.2E
•
Select Vertical Zoom to align the vertical linearity over the
entire screen height (for 16 : 9 applications only).
•
Set Trapezium Correction to align the lines at the vertical
sides.
•
Select East-West Width and align the picture width until
the side castellations disappear.
•
Select East-West Parabola / width and align the vertical
sides until the sides are straightened.
•
Select Upper Corner Parabola to straighten the top of the
vertical lines at the sides.
•
Select Lower Corner Parabola to straighten the bottom of
the vertical lines at the sides.
•
Repeat the last 5 steps if necessary.
Geometry alignments menu
Table 8-5
SC
SBL
VS
VSH
VA
HS
HP
HB
8.
EN 49
S
XX
ON/OFF
XX
XX
XX
XX
XX
XX
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