Siemens C55/2128 Service Manual page 27

SIEMENS Pte Ltd
C55/2128 Level 2 Service Manual
Next, the GSM test set will end the call to the mobile phone and the screen will
prompt for Dialing from the mobile phone. At this test step, please move the
mobile phone to the Antenna Cradle and switch the RF switch to EXT ANT
position. Once the mobile phone logs onto the GSM test set, dial 1234 and the
Send key.
The GSM test set will make Tx Power measurements, Rx BER measurement,
Echo Loop test on the GSM and GSM1800 channel specified by the
configuration setting. There will be an Echo Loop Back test for checking the
speech quality. Speak into the mobile phone when prompted and listen the voice
after approx 1 second and check the speech quality. If not O.K, it may be
microphone or the earphone defective.
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