Introduction to Alignment Procedure
A. Very firstly, trap circuits should be aligned.
B. If stage should be aligned next.
C. Sound section should be aligned.
D. Tuner should be aligned.
PRECAUTIONS TO BE TAKEN BEFORE ALIGNING A TV RECEIVER:
A) Sweep generator, CRO, and TV receiver are connected by shielded cables.
B) Every equipment should be earthed correctly.
C) Non-magnetic screw devices should be employed to align the receivers.
VIDEO IF ALIGNMENT PROCEDURE:
Very firstly, horizontal oscillator, AGC stages should be dialled. Connections are ready as displayed in the diagram. The equipments and receiver should be tuned 'ON'.
1) Response curve displayed in the CRO screen should be made clear.
2) Trap circuits should be aligned in the specific frequencies to acquire correct response curve.
3) Frequency range of from 34 to 38MHz should be flat in the response curve. For every frequency, marker frequency should be changed and then aligned.
4) Alignment should be made to acquire 50 percent amplitude of 38.9 MHz
SOUND IFALIGNMENT PROCEDURE:
A) Connections should be made as displayed in diagram.
B) Tuner should be chosen to a blank channel.
C) Marker frequency has to be 5.5MHz.
D) 5.5 MHz frequency response has to be made maximum through adjusting sound trap and sound IFTs.
OBTAINING BETTER ASPECT RATIO, PIN CUSHION AND CENTERING ADJUSTMENTS CENTERING:
A) In the pattern generator Cross hatch pattern should be selected.
B) Adjust the centring magnet to acquire the picture at the center of the screen.
OBTAINING BETTER ASPECT RATIO:
A) To obtain horizontal linear pattern Adjust horizontal linearity control
Adjust vertical height, linearity preset to obtain vertical linearity and accurate height in the pattern.
PIN-CUSHION ADJUSTMENT:
Adjust ring magnets and pin-cushion to acquire bend less pattern
SERVICING OF TELEVISION RECEIVERS:
The process of correcting a defective receiver is termed as servicing. It contains two methods.
1. Locating the fault
2. Troubleshooting
LOCATING THE FAULT:
The method of recognizing the effectual stage in receiver is termed as' Locating the fault'. We can recognize it through observing symptoms in the TV receiver.
TROUBLE SHOOTING:
The technique of identification of defective components and replacing those defective components to operate a TV receiver in good condition like 'Trouble shooting'.
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