Communications
Confidential 21 COM MD CC GRM T
J. Junggebauer
Version 1.0 July 2005
6.8 Loudspeaker faulty
Affected unit: Handset
Diagnosis code IRIS: 72200 (ACOUSTICS / RECEIVING / LOUDSPEAKER)
Repair level: Level 1
Components: Loudspeaker
Needed equipment: Multimeter
Working material: None
Diagnosis:
The diaphragm of the loudspeaker could be affected by dust or humidity or the
loudspeaker could be electrically faulty.
Make a sidetone check (service-menu) in order to check the sound of the speaker.
If there is no sound, check the resistance of the coil with a multimeter.
The typical resistance is appr. 15-16 ohms. In other cases replace it.
Repair:
Replace loudspeaker.
Test:
Put the repaired board in a testhousing.
Make a sidetone check by blowing into the microphone and checking the volume
of the noise on the loudspeaker.
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