Slr (Microphone-Path Faulty) - Siemens Gigaset 4010 Micro Service Manual

5.1.6.3 SLR (microphone-path faulty)

Fault code: D 19
Affected unit: Gigaset 4000 Micro handset
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 or the connection via contact springs is poor.
Repair by component exchange:
Remove the microphone and replace it by a new one. Do not bend the springs when
inserting the microphone.
Test:
Put the repaired board in a housing.
Make a sidetone check by blowing into the microphone and checking the volume
of the noise on the earphone.