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7.
Horizontal Output
The horizontal oscillator signal is output from pin 25 of IC201 and used for switching the
-
drive transistor Q431. This switching signal is current amplified by the drive transformer
T431 and drives the output transistor Q432. When Q432 turns ON, an increasing current
flows directly to the DY through
C441/C442
+ L441 /R441 +
DY +
Q432-C +
Q432-E
and the deflection occurs during the last half of the scanning period. When Q432 turns OFF,
the magnetic field stored in the DY up to that point causes a resonant current to flow into
the capacitors C435 and charges them. The current stored in C435 then flows back to the
DY causing an opposite magnetic field to be stored in the DY. This field then collapses
increasing a current which switches the dumper diode in Q432 ON. The resonance state is
completed,
and an increasing current then flows again directly to the DY through the
dumper diode.
By this means, the deflection in the first half of the scanning period is performed. When
Q432 turns ON at the end of the first half of the scanning period, the deflection during the
last half is begun, thus completing
one cycle.
IC201
lF/VIDEO/DEF.
I Mrl!i I L'.--?c-?c
! : L ' p ",=
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .' . . . . . . . . L44.~
. . . . . . . . . . . . . ..".
':
25 ~
R441
JL
=12oovp-p
DY
Q432r-—-—-—-—-—
-—-—-—-—-—.,:""
I
T431
................... .......... ... ..... .. .. ..
...................... :
~.:.
] :
::
—,
I H-DRIvE
>
—
I [' ........l............<..~
I 1
H COIL
J
'-\
h
b
1
C441
C442
Q431
R435
C437
------------
C urrent flow
of first half of
scanning period
m
—-—
Current
flow of Iaat half of scanning period
.
-26-
Training
Manuaf
AC1 Chassis
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