CCS Technical Documentation
Baseband Troubleshooting Instructions
Issue 1 10/02
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Nokia Corporation
Page 47
Figure 53: Audio Faults
Audio
faults
Is earpiece working?
Change earpiece.
Is it working now?
No
Retest
Yes
Set phone in LOCAL mode.
Use Phoenix Audio Test.
Set EXT IN, HP OUT, LOOP ON.
No
Measure DC
offset voltage
from earpiece pads.
Is it ~ 1.38 V?
Check L151, C160,
R164, and line.
If OK ->
change UEM.
No
Audio
faults 2
Yes
Measure MICB2
voltage from XMICP
pads (L106).
Is it ~ 2.2 V?
Yes
Check L106, C112,
R161, C163, R166,
C165, R167,
and line.
If OK ->
change UEM.
No
Earpiece 2
Yes