Information and Communication Mobile
Confidential 25 ICM MP CCQ GRM C
J. Junggebauer
Version 1.1 October 2003
7.10 Microphone faulty
Affected unit: Gigaset SL1
Diagnosis code IRIS:
73110 (ACOUSTICS / TRANSMITTING / MICROPHONE / NO FUNCTION)
73170 (ACOUSTICS / TRANSMITTING / MICROPHONE / LOW VOICE LEVEL)
Repair level: Level 1
Components: Microphone
Needed equipment: Tweezers
Working material: none
Diagnosis:
The diaphragm of the microphone is affected by humidity or nicotine with increasing
age or the microphone could be electrically faulty. There will be a higher attenuation
when measuring SLR (sending loudness rating). In most cases the microphone is
defective. The springs could be also bent and therefore cause contact problems.
Repair:
Take some tweezers and pick up the microphone.
Insert a new microphone and press it gently in the housing making sure that it is fixed
correctly.
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.
If there is a telephone tester with acoustic testhead make a SLR-test and check
whether the attenuation is o.k..
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