GE 4PE350A3 Instructions Manual page 24

EBI-6351
COLOR CAMERA
and produce
a more crisp and pleasing
black and white picture.
Chrominance Video Amplifier Board,
PL -7674505
The chrominance video amplifier is lo-
cated on the right side of the Camera. It
accepts red, blue, and green video from the
three color preamplifiers and amplifies it in
three separate, though identical, video am-
plifiers. Black levels are clamped using the
squash pulse from the timing and calibration
generator, PL -7674517. Both input level and
bandwidth adjustments are provided. A peak
voltage detector is furnished for each video
output to
permit d -c metering of video
levels.
Timing and Calibration Generator
Board, PL -7674517
The timing and calibration generator board
is located on the right side of the Camera.
It
accepts the 15 -kHz horizontal rate sine
wave from
the drive
converter board,
PL -7674581, and a horizontal blanking pulse
from the Camera sweep board. The outputs
include a buffered sine wave (for the Cam-
era sweep board, the viewfinder sweep board,
and the high -voltage power supply), a hori-
zontal rate squash pulse (for the chrominance
and luminance video amplifier boards) and
a power supply trigger pulse (for the Cam-
era power supply board). In addition this
board contains the calibration sawtooth gen-
erator and the tally light control circuitry.
Camera Sweep Board, PL -7674641
The
Camera sweep
board furnishes
the vertical sweep, the horizontal sweep,
the blanking pulses and sweep protection,
and the focus regulation for the Camera
Plumbicon tubes. A vertical rate sawtooth
is
also provided for the skew generator,
PL -7781890, and horizontal blanking is pro-
vided for the timing and calibration gen-
erator, PL -7674517.
10
Skew Generator Board, PL -7781890
The skew generator is used to provide
an electrical correction voltage to the hori-
zontal sweep windings of the four Plumbicon
tube yokes to compensate for any skew that
may be present.
Camera Power Supply Board,
PL -7674504G2
The Camera power supply operates as a
d -c to d -c converter from a regulated source
which
is controlled by series regulation,
drawing
its
power from a nonregulated
source. The power supply furnishes high,
intermediate, and low voltages at nominal
currents to the various boards. A 30 -hertz
square wave used for the alignment of the
Plumbicon tubes is also generated by this
power supply.
Registration Control Panel,
PL -7672688G3
This panel contains the WIDTH, H CENT,
H LIN, HEIGHT, V CENT, and V LIN con-
trol potentiometers with color keyed knobs.
An access door to the chrominance Plumbi-
con tube sockets is located on the left side.
The back
of
the panel houses the com-
ponents, wiring, and the registration printed
circuit board.
Local Camera Control Panel,
PL -7674510
This panel contains the Camera POWER
switch, BEAM, FOCUS, H ALIGN, V ALIGN,
and SKEW potentiometers on the right cen-
ter section. The EXP SELECT switch, iris
control potentiometer, ALIGN, and CALIB
switches
are located at the bottom. The
left section contains the METER SELECT
switch and the meter. The meter board,
resistors, wiring, and the skew generator
are located on the back of the panel. The
Camera
sweep board is located at the
top.