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  Fault in FM Radio Receiver

How to Find the Fault in FM Radio Receiver and Repair It:

To find the fault in FM radio receiver and rectify it.

Components Needed:

S. No

Name of Components/ Apparatus

Quantity

1.

2.

3.

Faulted FM radio receiver

Multimeter

RF/AF signal generator

1

1

1

To find the fault that occurred in Radio receiver:

There are two type of fault in radio receiver.

1. Live fault

2. Dead fault

We have to find which one of the above faults take place in radio receiver.

Live fault:

We have to switch on the radio and to choose a program channel. In this, there in just noisy sound in the speaker with no any programme, this fault in radio receiver is called live fault.

There are 5 Types of live fault in FM receiver:

1. Low volume

2. Hum sound noisy sound

3. Intermittent fault

4. Whistling sound

5. Motor boating sound

Dead fault:

If there is no sound while we switch on the radio receiver, then the fault is termed as dead fault.

Test:

1. Switch on the radio receiver and choose the programme, when hearing the programme, the volume is low from the speaker.

2. The volume is low; though we increase the volume control. So there in low volume fault.

3. After that calculate the voltage of the power supply, but it is showing correct value.

4. After that calculate the voltage in TBA810 IC when seeing the voltage is being low.

5. After that decided that the fault is in TBA810IC, so replace the IC with new one.

6. After that switch on the receiver, it works normally.

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