Control Data Corporation CDC CC63X Hardware Maintenance Manual page 112

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TABLE 6B-l. VIDEO ADJUSTMENT CONTROLS
CONTROL
V FREQ (Vertical
frequency
potentiometer)
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I PURPOSE
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I SYNC CONTROLS
I
Adjusts vertical
synchronization or
raster steadiness.
ADJUSTMENT
Adjust so screen
information is not
rolling or is stable
and locked in.
H HOLD (Horizontal Adjust horizontal
hold potentiometer) stability.
Adjust so that screen
information is stable
and locked in.
FOCUS (Potentio-
meter)
DYN (Dynamic focus
potentiometer)
G2 (Video gain
potentiometer)
CONT (Contrast
control
potentiometer)
FOCUS CONTROLS
Adjust clarity or
sharpness of center
screen area.
Adjusts clarity or
sharpness of screen
edges.
Adjusts screen
brightness (both
foreground and back-
ground) .
Adjust for best
resolution or sharp-
ness of character in
center of display.
Adjust for best
resolution or sharp-
ness of characters
on screen edges.
Adjust so that screen
is just dark enough
to lose all background
after turning BRIGHT-
NESS control on front
of terminal to maxi-
mum brightness.
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I
I
I
IAdjusts brightness Adjust for desired
I
Icharacters (fore- brightness with front
I
Iground) without panel CONTRAST control
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Ichanging background fully on. I
br ightness.
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V CTR (Vertical
centering poten-
tiometer)
6B-26
VERTICAL CONTROLS
Controls vertical
centering of raster
on screen; or moves
both vertical lines
of alignment raster
up or down.
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I
Adjust raster so that I
it is centered verti-
I
cally on screen or
I
vertical lines of
I
alignment raster align
I
with bezel notches.
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