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  Fault Occurred in AM Radio Receiver

Identify the Fault Occurred in AM Radio Receiver (50 Hz Hum Sound) and Rectified It:

To identify and repair the fault (50 Hz Hum sound) occurred in AM radio receiver.

Components Needed:

S. No

Name of Component / Apparatus

Quantity

1.

2.

AM radio receiver

AVO or Multimeter

1

1

Test the receiver:

1. Switch on the receiver.

2. Hear the programmes along with 50 Hz hum sound.

3. Thus confirm the fault must be 50 Hz hum sound.

Stages where the fault take place:

1. Power supply

2. Audio amplifier and output

3. IF Amplifier

Test:

1. Receiver should be switched on to hear the hum sound.

2. Very firstly testing the power supply part, the transformer gets heated.

3. After that switch OFF the receiver and test the Transformer.

4. On seeing the centre of the transformer coiled loosely.

5. Decided the fault is exists in the transformer.

6. After that changed the new transformer instead of faulted one.

7. After that switch ON the receiver and hear the programme without hum sound.

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