Nokia NPC-1 Series Troubleshooting Instructions page 14

NPC-1
Troubleshooting Instructions
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
UPP is not used.
3 Run
ST_EAR_DATA_LOOP_TEST). This loop will test the ear-data/mic-data lines
between the UPP and the UEM.
Earpiece or external microphone line does not work
Earpiece doesn't
work
Run audio-loop
selftest with
phoenix
Check R157
Check
earpiece
Change UEM
Page 14
the audio-loop self-test
Fault tree, earpiece fail
Figure 4:
Fail
OK
OK
OK
ãNokia Corporation
PAMS Technical Documentation
with Phoenix
Feed 1KHz to Xmic
by JBA-8 and
measure from
earpiece
Fail
(BB Self Tests /
OK
Change UPP
Issue 1 10/01