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The monitor is designed to accept composite sync signals
on the green video input, or from the mixed sync input.
This selection is made automatically by sync switch
circuit.
A sync separator circuit strips the sync
information from the composite green video.
The separated composite sync is applied to the horizontal
and vertical sync generators.
The clamp pulse generator
circuit extracts and forms a backporch pulse, which is
provided to the video amplifiers for the de restoration.
A negative horizontal and vertical sync signals from the
PCB-VIDEO-SUB drive the horizontal sync regenerator and
vertical oscillator.
The vertical oscillator generates the vertical sweep
waveform.
Current feedback is provided to the vertical driver
amplifier for operational stability and linearity
correction.
Vertical deflection current flows through
the vertical yoke coil and feedback resistor {Rf) •
A vertical sawtooth voltage which developed across the
feedback resistor (Rf) is supplied to the vertical driver
amplifier and T/B PCC (Top and Bottom Pincushion Correc-
tion) modulator.
The modulated output signal is applied
to the vertical driver amplifier.
Horizontal sync signal drives the horizontal sync re-
generator.
The regenerated horizontal sync signal is
supplied the horizontal AFC phase detector which also
receives a comparison voltage from the HOT (Horizontal
Output Transformer) .
The output of the phase detector
is proportional to the difference in phase between the
two signals.
The phase detector output is used to
control the horizontal oscillator frequency resulting in
horizontal phase-lock.
The horizontal deflection output
stage, located on the PCB-DEFL, drives the horizontal
yoke.
3-2
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