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DIDS-402-2AM13
4-29.2 Vertical Deflection Amplifier
The vertical deflection amplifier develops a skew-corrected vertical
deflecti on voltage from a V Drive digital level coupled from the line counter on
the timing and discrete board (A14).
The V Drive signal, which is positive for
. 13 horizontal line times and negative for one line time, is converted to a saw-
tooth voltage by a ramp generator formed by transistors Q1 and
Q2.
At the base of 03, the vertical sawtooth is combined with a horizontal skew
voltage which produces a stepped sawtooth voltage.
This stepped voltage adjusts
the vertical deflection sawtooth so that the CRT scan is not moved vertically
until the completion of each horizontal line.
In
the absence of the horizontal
correction voltage, the trace resulting from combined horizontal and vertical
deflection voltage s would produce the raster shown in figure 4-22. part A.
When
the correction voltage is applied, however, the wave form shown in part B of
figure 4-22 produces perfectly horizontal scan lines.
The stepped sawtooth output of Q3 is applied to push-pull amplifiers Q4 and
07 to develop opposite phase signals.
These signals are applied to a push-pull
current amplifier formed by transistors 05, 06, Q8 and 09 before being coupled
to the vertical deflection coil.
Gain control R27 limits the amount of signal in the feedback loop and
thereby controls the amplification of the amplifier.
SECTION IV
INTEGRATED CIRCUITS
4-30 GENERAL DESCRIPTION OF SECTION CONTENTS
This section contains detailed explanations of the individual integrated
circuits (I-Cis) used in the Display Terminal and the operation of the various
logic elements contained in each I-C.
The purpose of this section is to provide
logic diagrams and reference material for each I-C.
In
addition, basic logic
explanations are provided herein for the maintenance technician who is not
familiar with digital logic techniques.
For the most part, I-CiS are concentrated on digital logic boards Al2,
A13, and A14.
The remaining I-Cis are located on the various analog boards.
The I- C
t
S
employed in the Display Terminal utilize transistor-transistor-logic
(TTL or T2L).
.
4-31 INTEGRATED CIRCUITS
Table 4-4 lists the types of I-CIs used in the Display Terminal.
All manu-
facturer
IS
part numbers are cross-referenced to Raytheon part numbers to assist
in ordering replacement parts.
4-163
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