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8.
Deflection
section.
(1)
The internal block diagram only for the deflection is shown in Fig. 18.
Gate Pulse
Generation
RAMP
dee E
Xray
Port.
12V
'f
ver
=
Sa ik a an ss ce
+
R317
T0353
C403
CR
(6)
Nna02
is
INT
§
ync sep.
;
H
R409
Time constant
Vertical output
Height
DRIVE
c206 C254
i
+eg— R226
VERT
bw
SYNC
R227
D202 R218
INT
16.5V
eres
NFE
+
+ R407 | p40
V. HOLD 3*> Wc352
VERTICAL
R C453
12V FROM PWR SUPPLY
VR301
7
osc.
9
D820
12V Vcc
Fig. 18. DEFLECTION SECTION
The deflection section of the TA7698AP (KA2154) includes a sync seperator, a sawtooth type horizontal
AFC, @ horizontal oscillator, a horizontal pre—driver, a vertical oscillator and a vertical pre—driver.
The GND line of this section is seperated to the-other, but the Vcc line except the AFC and the hori—
zontal section is common
to the other sections.
SYNC seperator.
Pin 37 is an input terminal of the base-time constant type sync seperator. The positive—going video
signal from Pin 40 (inverter output) is applied to Pin 37 through a sync seperator time constant cir—
cuit. The slice levels of the horizontal sync and the vertical sync can be set independenty as described
in Fig. 19.
37
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