Nokia RH-13 Series Troubleshooting Manual page 17

CCS Technical Documentation
3 In case of internal microphone/XEAR fail: Feed tone to microphone and measure
signal from XEAR line. Audio test box JBA-8 is needed. Audio loop (Audio test/Hp
In Ext Out) must be switched on by Phoenix service software. This loop will con-
nect audios only through UEM. In this case UPP is not used.
4 Run audio- loop selftest with Phoenix (BB Self tests/ST_EAR_DATA_LOOP_TEST).
This loop will test the eardata/micdata lines between UPP and UEM.
Issue 1 11/02 ãNokia Corporation
RH-13
Troubleshooting
Page 17