Philips 20PT643F Service Manual page 73

Vertical Amplitude and Position:
Figure: Vertical alignment menu
Vertical Amplitude (VAM). Aligns the height of the picture (other vertical
alignments are NOT compensated).
Vertical slope (VSL). Aligns the picture so the proportions are the same at the top
and bottom of the screen. This alignment must be performed first, before all other
vertical alignments. Turning SBL 'on' will assist in performing this alignment.
Service blanking (SBL). Turns the blanking of the lower half of the screen 'on' or
'off' (to be used in combination with the vertical slope alignment).
Vertical S-Correction (VSC). Aligns the vertical linearity, so that the vertical
intervals of the grid-patterns are the same over the entire height of the screen.
Vertical Shift (VSH). Aligns the vertical center of the picture to the vertical center
of the CRT. After performing this alignment, it may be necessary to perform the
VAM alignment again.
Vertical Zoom (VX). Adjusts the picture height.
Delta Horizontal Shift 60 Hz (H60).
Delta Vertical Amplitude 60 Hz (V60).