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Set the lens to infinity and adjust electrical
FOCUS,
at the rear panel, for the sharpest
possible
focus.
It is important
to have
electrical
focus
set correctly
before
the
following adjustments are attempted.
Loosen the four Phillips-head screws
at the
bottom-front
of the camera.
Do not loosen
these screws too much,
just enough to allow
the vidicon mount to move.
Insert a thin
screwdriver into the hole just below the lens
mount and adjust the screw for best optical
focus.
LOOSEN
THESE
SCREWS
ADJUSTING
SCREW
Fig. 3-4.
OPTICAL
FOCUS ADJUSTMENT.
Carefully tighten the four screws that lock the
vidicon mount in place.
Check optical focus
after all screws have been tightened to make
sure that focus has not changed.
Repeat Steps
ce and d if necessary.
Point the camera at a test card 2-1/2 ft from
the lens.
Check to see that focus occurs at
the 2.5 ft mark on the focus ring.
Reset the
vidicon mount,
if necessary.
Note:
the following items should be checked
whenever optical and electrical focus has
been adjusted.
Tilted Picture.
If the picture is tilted (not
upright) the deflection yoke must be rotated
about its axis.
Loosen the two screws that
secure the white plastic vidicon clamp to the
rear of the yoke assembly.
Rotate the yoke
until the picture is upright,
and tighten the
two screws.
Flicker and Horizontal Bars.
Occasionally,
the bright parts of the picture may flicker
or narrow horizontal bars may appear in
the picture at or near the correct focus
setting.
These symptoms can usually be
remedied by rotating the vidicon to a new
position inside the yoke.
:
Loosen the vidicon clamp and turn the vidi-
con (do not apply torque to the socket) 90 or
180 degrees.
Usually, best results are ob-
tained when the index pin (short pin) is at
the 3 o'clock position.
Tighten the vidicon
clamp at the best vidicon position.
3-6.
VIDEO ADJUSTMENTS
Five adjustments determine the characteristics of
the video output signal.
These are:
Set-Up Level
(VR-5)
Target Voltage
(R215)
Sync Level
(VR-4)
White Clip
(VR-3)
Aperture (Freq.
Adj)(VR~1)
Correct target voltage settings are important as
they determine overall sensitivity, video-output
level,
and image persistance.
It is recommended
that video adjustments be made in the following
sequence.
Preliminary Setup .
Terminate the video output
circuits of the camera in 75 ohms.
This may be
done by connecting the camera to the Videocord-
er in the usual way and placing the output selector
in the VTR position.
As an alternative,
connect
a 75-ohm terminator to the- VIDEO and RF OUT
jack on the rear of the camera.
A 75~ohm re-
sistor connected between the center pin and the
body of a PL 259 connector will serve as the
terminator.
If the VTR is used as the terminator,
connect the vertical input of the scope to the video
output conductor on the V board.
If a terminator
is used, connect the scope across the 75-ohm re-
sistor.
Set-up Level Adj.
a.
Unsolder the target lead (yellow) where
it
connects to the extreme lower left of the
video board.
b.
Turn on the camera and set the power switch
to STANDBY.
ce.
Adjust the scope controls to display two
vertical sync signals.
(Use LINE SYNC
if the output selector is in the VIDEO pos-
ition. )
d.
Turn VR-5 (Set-up level) counterclockwise until
the set-up level and the blanking level are the
same,
as shown in Fig. 3-5a.
Then turn VR-5
clockwise until the set-up level is 0.1 volts, as
shown in Fig. 3~5b.
e.
Turn off the camera and resolder the target lead
to the video board.
3-3
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