Siemens A50 Service Manual page 36

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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 a Echo Loop
Back test for checking the speech quality. Speak into the mobile phone when prompted and listen
the voice after appr. 1 second and check the speech quality. If not O.K, it may be microphone or
the earphone defective.
The last test is Disconnect Call from the mobile phone. Press the End Call key and the test
sequence will end.
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