Mitsubishi C-6919 Service Manual page 28

The horizontal sync signal stripped from the green
video signal is shaped by sync processor on the PCB-
VIDEO-SUB and applied to the Horizontal Regenerator,
IC501, pin number 13. Two gates of this IC501 are
used as monostable multivibrator which equalizes
horizontal sync pulse width.
The regenerated sync signal is applied to pin 16 of
IC503 through sync amplifier, Q507.
The comparison voltage is applied to pin 14 of IC503.
This comparison voltage is formed by integrator,
R507 and C507 from the horizontal retrace pulse from
the horizontal output transformer, TS02.
Output pulse from IC503, Pin 10 is converted to saw-
tooth wave signal in Miller Integrator QSOl. QSOl
turned on and off at the zero-cross level of the
sawtooth waveform.
The square wave signal with duty cycle (1 : 1) is
generated IC502
~nd
this
s~uare
wave is applied to
Q502 through ICSOl, pin 4/5 and 6.
Transistor Q502 drives interstage transformer T501,
which ir. turn couples the drive signal to the base of
horizontal output transistor QSSl. Capacitor C514 and
resistor R522 provide wave-shaping.
Horizontal output transistor QSSl is driven into
conduction for approximately
15
microsec0nds at the
end of each horizontal sweep and turns off at the
beginning of the retrace period.
Retrace time is determined by the resonant frequency
·of the parallel circuit formed by the inductance of
the horizontal deflection yoke, the inductance
of
horizontal transformer T502, C519 and C521.
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