Vertical
Oscillator
vcc 2
Frame
Vcc 2 Generator
Oscillator
Frame-Synchro
Generator
Line Fly Back Phase
Input
Detector
Horizontal
Oscillator
Vertical
o u t p u t
P o w e r
Amplifier
Input
Horizontal
o u t p u t
Figure 4, BLOCK DIAGRAM OF THE TEA 2037A
3. COMPOSITE VIDEO INPUT AND HORIZONTAL/
VERTICAL DEFLECTION
3-l VIDEO INPUT (PIN 15)
3-3
The detection level for negative sync pulse at the
sync separation input (pin 15) is set at
When
the voltage at emitter of the Transistor (pin 15) is
above
the transistor is cut off. Voltage
lower than
enables the transistor to conduct
a n d t h e
internal
circuitry
i s
enabled for
synchronization function.
3-4
LINE (H) OSCILLATOR (PIN 9)
The line oscillator is of the type which charges and
discharges a capacitor, since a perfectly linear
sawtooth wave form is not required.
The free running frequency is dependent on
R705 and VR702 and is governed by this expres-
sion To = 085 x
x
where To is the line
oscillator free running frequency.
FRAME(V) OSCILLATOR (PIN 9)
Oscillator thresholds are internally fixed by
resistor
R603 are used to determine the
free-running frequency, the oscillator
free-running frequency is given by To
0.15 x
x R603.
3-2 COMPOSITE VIDEO INPUT (PIN 15)
