Page 40 - Electronic Mechanic - TP - Volume - 2

ELECTRONICS MECHANIC - CITS

EXERCISE 125: Find out the fault of basic cell phone

system recetify the fault in ringer section
and check the performance

Objectives

At the end of this exercise you shall be able to:
• check for any visible damage to the speaker, speaker connections, or related components
• properly functioning ringer ensures that users are promptly alerted to incoming calls and notifications, leading
to increased satisfaction with the device’s overall performance.

Requirements

Tools/Materials
• Multimeter - 1 No. • Anti- static wrist strap - 1 No.
• Screw drivers - 1 No. • Cleaning tools - 1 No.
• Test signal generator - 1 No. • Voltage/ current source - 1 No.
• Soldering iron - 1 No.

Procedure

1 Ringer Components:
Speaker: The speaker produces sound when activated by the ringer circuit.
Ringer Circuit: This circuit includes components such as capacitors, resistors, and transistors that control the
activation and modulation of the speaker.
2 Common Faults:
Speaker Damage: Physical damage to the speaker can result in no sound output or distorted sound.
Loose Connections: Loose or corroded connections between the speaker and the circuit board can cause
intermittent or no sound output.
Faulty Components*: Capacitors or resistors within the ringer circuit may degrade over time or fail, leading to
issues with sound quality or volume.

Software Glitches*: Software bugs or incorrect settings may prevent the ringer from activating or producing
sound.
3 Testing and Performance Check:

Functional Test: Verify if the ringer produces any sound when a call or notification is received. If not, check for
faults in the speaker, connections, or circuitry.
Audio Quality Test: Listen to the sound produced by the ringer to ensure it is clear and free from distortion.
Volume Test: Adjust the ringer volume settings to ensure it meets the desired level of loudness.

Consistency Test: Ensure that the ringer reliably produces sound for all incoming calls and notifications.
Software Check: Verify that the phone’s software settings related to the ringer are configured correctly and reset
to default settings if necessary.

4 Troubleshooting Steps:
Visual Inspection: Examine the speaker, connections, and circuitry for any visible damage or abnormalities.
Component Testing: Use a multi meter to check the continuity and resistance of components within the ringer
circuit.

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CITS : E & H - Electronics Mechanic - Exercise 124