5. Deflection System
5-l.
Horizontal system
5-l-l. Horizontal synchronization circuit
AFC and Horizontal Oscillation are conduced by inputting Sync signal, Horizontal Output pulse and
Horizontal Oscillation Control current to IC5Al
(iA7850).
The output of horizontal phase circuit is input to
IC
(pin
0)
as the Sync signal via
C5A7.
Sync signal is triggered at the breaking edge by the Bias voltage
which is determined by
R5A7
and
R5A6.
Horizontal Output pulse is input to IC5Al
(
pin
@)
and the Saw
Tooth Wave is generated at IC5Al
(
pin
0).
AFC circuit is composed by
C5A3,
C5A2,
C5A1,
R5A3
and
R5A2.
Horizontal Oscillation Control current
f!ows
into the
C5C7
through
IC5A2
(pin
0).
When the voltage at IC5Al (pin
@I)
reaches
l/3
Vcc, Charge
and Discharge of C5C7 is switched by IC5Al and the Saw Tooth Wave is generated. Horizontal Oscillation
control current is controlled by H-F/V voltage.
Vcc(lZV)
‘;;r,
.._..........
~.
‘,,“cc
.._..
_
.
.
.
.
ILLI!._
.__........_.._____
_..1?
‘jaVcc
CND
.
IC5Al
LA7850
C5Al
C564
-t
._
(
Fig 5-l-l) Horizontal Synchronization Circuit
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