TM 9-6625-1753-14
C2
Figure 3-22. Delayed-armed mode, functional block diagram.
b. The POSITION control supplies a manually-adjustable dc voltage to the base of Q8301 for positioning the display on
the screen. The output from the emitter of Q8301 is applied directly to common emitter amplifier Q8302 and Q8303, which
converts the single-end input to a push-pull output. The signal progresses through emitter follower Q8305 and Q8306, and is
then applied to output amplifier Q8307 to Q8311. In this output amplifier stage, the signal develops the necessary power for
driving the horizontal deflection plates. Ten-times magnification of the sweep is accomplished by reducing the common
emitter amplifier feedback of Q8302 and Q8303, by a factor of 10 when the X10 control is pulled out. Consequently, the
sweep rate observed on the screen of the cathode-ray tube is effectively magnified ten times. The X10 REGISTRATION
potentiometer R8311 is provided to adjust the voltage level at the base of Q8303 so that the center of the trace is not
depositioned from CRT screen center when the PULL X10 switch is activated. For the Type 765 Series, a PATTERN
POSITIONING control is mounted on the front panel of the Main Frame, and it is electrically coupled to the POSITION control
of both the X and Y Plug-ins. This feature permits positioning the entire display in the horizontal and vertical directions on the
screen via use of the single joystick control.
Figure 3-21. Simplified timing diagram, delayed-armed strobe display.
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