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9_
10.
Keep all Hi-Lite Controls
as near clockwise
as possible.
At
least one Hi-Lite
Control
must remain
in it's full clockwise
position.
Repeat steps 7 through
9 as needed to achieve
gray in the
darkest
areas of the picture
and white in the bright areas.
Always
adjust
Lo-Lite controls
to correct dark areas of the
picture and Hi-Lite controls to correct bright areas of the pic-
ture.
Note:
If the PTV is older or has much use, other adjustments
may be required
to optimize
the performance,
such as focus
and G2 Screen
Control)
settings.
These
adjustments
were
described
in the previous
procedures.
Also, any dust should
be
cleaned
from the output lenses,
mirror, and back of the screen
with a soft cloth.
Screen
Geometric
And Centering
Adjustments
Notes:
1.
The set should be warmed
up for at least 20 minutes before
making screen setup adjustments.
2.
The raster of the GREEN CRT must be centered
and adjust-
ed for a screen display that is as distortion free and geomet-
rically
correct
as
possible
before
going
on
to the
convergence
procedure.
3.
After the green screen is adjusted
for correct geometry
and
centering,
its controls will not be used for convergence.
The
red and blue screen
displays
will individually
be made to
conform
to the green.
Thereby,
centering
and geometry
will
be preserved
and convergence
more easily accomplished.
Setup
1.
To locate the center of the screen,
place strings
diagonally
across the viewing area.
DO NOT TAPE TO THE SCREEN.
Use low-tack
type masking
tape and tape to the cabinet to
hold the strings in place.
2.
Connect
Pattern Generator
(with crosshair
and crosshatch
available)
to Antenna
Terminal
and tune
the set to the
Generator.
21
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