Audio Failures - Nokia RH-21 Series Troubleshooting Manual

CCS Technical Documentation

Audio failures

In case of audio failures, there are three possibilities to check the audio lines.
1 Make a phone call against tester and check audios.
2 If the earpiece/XMIC fails: Feed a 1Khz signal to the XMIC line and measure the
signal from the earpiece line. The Audio test box JBA-8 is needed. The Audio loop
(Audio test/Ext In Hp Out) must be switched on by the Phoenix service software.
This loop will connect audios only through the UEM. In this case, the UPP is not
used.
If the internal microphone/XEAR fails: Feed the tone to the microphone and mea-
sure the signal from the XEAR line. The Audio test box JBA-8 is needed. The
Audio loop (Audio test/Hp In Ext Out) must be switched on by the Phoenix service
software. This loop will connect audios only through the UEM. In this case, the
Issue 1 05/2003 Confidential
Figure 3: Fault tree, charging
Nokia Corporation
RH-21
Troubleshooting
Page 13