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  Fault in an AM Receiver

Troubleshooting and Recitation of the Fault in an Am Receiver

To identify and rectify the faults in a AM receiver.

Components Needed:

S.No

Name of Components/Apparatus

Quantity

1.

2.

3.

AM receiver under fault condition

Multi meter

RF/AF Singal Generator

1

1

1

Fault Detection:

Usually two types of faults are occurred in radio receiver. They are

1. Live fault

2. Dead fault

First we have to locate that, which type of fault is exists in the receiver.

1. Live fault:

Switch on the receiver, and tune the receiver to a specific channel programme.

The fault while there is no programme and on hearing only distortion sound is live fault.

Type of Live faults:

1. Low volume,

2. Hum sound / noisy sound,

3. Motor boating sound,

4. Whistling sound,

5. Intermittent fault

2. Dead fault:

On switching the power supply of receiver, if there is no sound in the speaker of radio receiver;

the fault is termed as dead fault.

Process:

1.  While there is no sound in the speaker, while switching on the power supply, the fault is confirmed as dead fault.

2.  Set the input voltage like 6v

3.  And measure the voltage at audio amplifier and output of the receiver check for the correct reference voltages.

4.  Check the speaker, there is an open fault made at voice coil of the speaker, it is conformed.

5.  So, faulty speaker is removed, and new speaker is connected through soldering process.

6.  Now switch on the receiver, it is working accurately.

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