Goldstar MBM-2105GIA service manual Composite Video Input and HORIZONTAL/ Vertical Deflection

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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.

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Contents Before Servicing the CHASSIS, Read the Safety GolclStarFeatures Power PUSH-ONPower Supply Circuit DescriptionVideo Amplifier To CRT CA.THODEComposite Video Input PIN Line H Oscillator PIN Composite Video Input and HORIZONTAL/ Vertical DeflectionFramev Oscillator PIN Adjustment Centering AdjustmentVertical Size VR601 Horizontal Size L703Aibic OeflCapacitors are Shown Tolerance Unless Otherwise NotedDiagram 01G.h R719Troubleshooting Guide REG Circuit ~Printed Circuit Board Main PCBMain PCB Solder Side Line Filter PCB Solder Side Exploded View Replacement Parts List Mechanical PartsIE if Replacement Parts List 20-0040 Neon Lamp

MBM-2105GIA specifications

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