Goldstar MBM-2105GIA Composite Video Input And Horizontal/ Vertical Deflection, l VIDEO INPUT PIN

Vertical	F,B)
Oscillator	vcc 2

1 Oscillator 1

Frame-Synchro

Vetical Frame

Vcc 2 Generator

Generator

Vertical o u t p u t

P o w e r Amplifier Input

Horizontal output

Line	Fly Back Phase	Horizontal
Input	Detector	Oscillator

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 1.6V. When the voltage at emitter of the Transistor (pin 15) is

above	1.6V,	the	transistor is	cut	off. Voltage
lower than 1.6V enables the transistor to conduct
a n d	t h e internal		circuitry	i s	enabled for
synchronization		function.

3-4

3-2 COMPOSITE VIDEO INPUT (PIN 15)

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 C705, R705 and VR702 and is governed by this expres- sion To = 085 x C705 x R705 where To is the line oscillator free running frequency.

FRAME(V) OSCILLATOR (PIN 9)

Oscillator thresholds are internally fixed by resistor C601, R603 are used to determine the free-running frequency, the oscillator free-running frequency is given by To = 0.15 x C601 x R603.