Information and Communication Mobile
Confidential 22 ICM MP CCQ GRM C
J. Junggebauer
Version 1.1 October 2003
7.7 Earphone capsule/ receiver faulty
Affected unit: Gigaset SL1
Diagnosis code IRIS: 72100 (ACOUSTICS / RECEIVING / EARCAP)
Repair level:
Level 1
Components:
Earphone capsule/ receiver
Needed equipment: Multimeter
Working material: None
Diagnosis:
The diaphragm of the earphone could be affected by deposits with increasing age.
There will be a higher attenuation when measuring RLR (receiving loudness rating).
In most cases the earphone capsule is defective.
If there is no noise audible on the earphone when making a sidetone check it’s also
possible that the wire of the coil is broken.
Check the resistance of the coil with a multimeter.
The typical impedance is appr. 32 ohms. In other cases replace it.
Repair:
Replace earphone capsule.
Test:
Put the repaired board in a testhousing and check the correct function.
If there is a telephone tester with acoustic testhead make a RLR-test and check
whether the attenuation is o.k..
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