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  Alignment Techniques

Introduction to Alignment Techniques:

Alignment of TV Receivers:

To align and service a TV receiver the following equipments are employed

A. Multimeter (20,000 Q/V AC & DC)

B. Marker generator

C. Wobbuloscope

D. Video Pattern Generator

E. Cathode Ray Oscilloscope (CRO)

F. Sweep generator or Wobbulator

G. Vector scope

Multimeter:

We should employ a multimeter with great sensitivity for align a TV Receiver. The sensitivity of it should be 20,000Q/V AC & DC. That is to compute II V ac or dc, the input impedance of the meter have to be 20,000fL I because of the high impedance of meter, it does not form voltage drop in I circuits when measuring. A low input impedance meter might damage [Cs when measuring pin voltages.

EHT Voltmeter:

EHT voltmeter is employed to calculate EHT voltage that is applied to final anode lor ultor of a TV receiver. The ranges of it are from 0 to 30,000 V AC/DC. We should use a lot insulated probes to calculate EHT voltage.

These | probes are termed as EHT probes. An extremely high resistance is connected in series with the probes to calculate this voltage.

Video Pattern Generator:

Video pattern generator is extensively used to align and service TV receivers. Due to this purpose, it generates several patterns and sound.

USES:

A. It is employed to align vertical linearity, horizontal linearity and vertical height.

B. It is employed to adjust pin cushion adjustment, centenary of picture, and linear aspect ratio.

C. It is employed to get brightness, perfect contrast, and focusing levels.

D. It is employed to align RF, IF and sound sections.

E. It is employed to get adjust purity, and to natural colour and convergence in dolour receivers.

F. It is employed to align a TV receiver while the program transmission is absent.

FRONT PANEL LAYOUT OFAVIDEO PATTERN GENERATOR AND METHOD OF USING IT:

Very firstly, output is obtained from RF out and is connected to the TV receiver. Alternator is given to control the gain of the RF signal.

1) We can adjust linearity and vertical size by using horizontal bar pattern.

2) We can adjust horizontal line rarity by using vertical bar pattern.

3) Through using cross hatch pattern, we can adjust both horizontal and vertical adjustments and also focusing.

4) By Using 7 bar colour pattern, we cal align the chrome stages of a colour TV receiver to get better colour.

5) We can align convergence adjustment using Dot pattern In colour receivers,.

6) We can adjust black level and white level using pure white pattern in colour receivers.

7) By using the sound form the generator, we can align sound section

CATHODE RAY OSCILLOSCOPE:

Cathode ray oscilloscope is abbreviated as CRO. By using this equipment, we can observe the wave forms in the screen

USES OF CRO

1) It is employed to see the time varying signals

2) It is employed to align RF, IF, Deflection and sound sections of a TV receiver.

3) It is employed to measure signal voltage

4) It is employed to service TV receivers

5) It is employed to service VCR and VCP

6) It is employed to measure frequency of a signal

7) It is employed to measure phase shift

SWEEP GENERATOR:

Sweep generator generates sweep frequency to align RF, IF and sound sections to acquired response curve in CRO.

MARKER GENERATOR:

Marker generator is employed to get peak response of a specific frequency in TV receivers.

WOBBULOSCOPE:

Wobbuloscope is equipment that consists of a Wobbulator, CRO and a marker generator.

VECTORSCOPE:

Vector scope consists of a colour bar generator and a CRQ.

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