Philips 20PT643F Service Manual page 72

Service manual
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The following alignments can be performed in the GEOMETRY sub menu:
Horizontal Amplitude and Phase:
Figure: Horizontal alignment menu
Horizontal Shift (HSH). Select Horizontal Shift to center the picture on the screen.
Horizontal Parallelogram (HP). Set Horizontal Parallelogram to prevent the
picture from slanting to one side.
Horizontal Bow (HB). Set Horizontal Bow to prevent the top and bottom of picture
from bending to the sides.
East West Width (EWW). Select East-West Width and align the picture width until
the complete test pattern is visible.
East West Parabola (EWP). Select East-West Parabola and align the vertical
sides until the sides are straightened.
Upper Corner Parabola (UCP). Select Upper Corner Parabola to straighten the
top of the vertical lines at the sides.
Lower Corner Parabola (LCP). Select Lower Corner Parabola to straighten the
bottom of the vertical lines at the sides.
East West Trapezium (EWT). Align straight vertical lines in the middle of the
screen.

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