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Litecontrols t o
correct bright areas of the picture.
Note:
If the PTV is older or has m. u ch 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 adjusted for
a screen display that is as distortion free and geometrically correct
as possible before going on to the convergence procedure.
3.
After the green screen
is adjusted
for correct
geometry
and
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.
3.
To prevent customer controls from affecting adjustments,
connect
jumpers
from the bottom
of the following
resistors
to ground:
ground). Also, tie the lower Pin of the Setup terminal to ground
(this is to temporally disable the Convergence Panel adjustments).
Screen Centering
1.
Adjust Centering Tabs to center each color at the center of the
screen (point of string crossing).
Note:
Be sure strings are installed correctly or the Skew adjustment
will have a major affect on Centering.
Green Screen Geometry Adjustments
1.
Cover the Red and Blue CRT Output Lenses with 7 inch square
pieces of cardboard, blocking the light output from these lenses.
2.
Loosen the Yoke clamp on the Green CRT.
3.
By rotating the Yoke, visually adjust the vertical Skew.
19
4.
Re-tighten the Yoke clamp.
5.
Remove
ONLY
the lower
Setup
Pin jumper,
enabling
the
Convergence Panel controls. Do not remove the other jumpers at
this time (keep Customer Controls disabled).
6.
Select the crosshatch pattern.
7.
Adjust the Vertical Size (R551) on the Signal/Deflection
Module for
approximately 3/4" overscan at the top and bottom of the screen
(viewed from the back side of the screen).
8.
Adjust the Horizontal Size (R46g) on the Signal/Deflection Module
for approximately 3/4" overscan at the left and right back side of
screen.
9.
Repeat steps 7 and 8 as needed to produce true squares (height =
width) throughout the crosshatch pattern. Use a ruler to check
these results.
Note: Approximately 3/4" overscan should be maintained.
10. Adjust the Green Controls on the Convergence
Panel to achieve
the best possible Green Geometry.
Blue Screen Convergence Procedure
1.
Uncover the Blue Output
Lens (leave
the Red Output
Lens
covered).
2.
Re-connect
the
Setup
Terminal
Jumper
(to disable
the
Convergence
Panel Adjustments).
3.
Loosen the Yoke clamp on the Blue CRT.
4.
By rotating the Yoke, visually adjust the Blue horizontal Skew at
the center portion of the screen (the upper and lower portions may
not be properly aligned).
5.
Re-tighten the Yoke clamp.
6.
Remove
ONLY
the lower
Setup
Pin Jumper,
enabling
the
Convergence
Panel Controls. Do not remove the other jumpers at
this time (keep Customer Controls disabled).
7.
Adjust ONLY the Blue Controls (size, keystone, trapezoid, etc.) on
Layout And Alignment
Guide (included
in your In-Home Service
Guide) to aid in selecting the needed controls.
CAUTION:
It would be a time-consuming
mistake to adjust any of th
green convergence
controls. Remember, the green geometry must be
preserved to obtain proper centering and convergence.
Red Screen Convergence
Procedure
1.
Uncover the Red Output Lens and re-cover the Blue CRT Output
Lens.
2.
Re-connect
the
Setup
Terminal
Jumper
(to disable
the
Convergence
Panel Adjustments).
3.
Loosen the Yoke clamp on the Red CRT.
4.
By rotating the Yoke, visually adjust the Red Horizontal Skew at
the center portion of the screen (the upper and lower portions may
2O
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