User Guide

2115i/2116/2116i (RH-66)
Baseband Description and Troubleshooting
Page 44 ©2005 Nokia Corporation Company Confidential Issue 1 03/2005
Audio
Faults
Page 2
Audio
Faults
Page 3
Is the
microphone
working?
Change the
microphone. Is it
working now?
Retest
Set the mobile terminal in Local
Mode. Use Phoenix
Troubleshooting > Phone
Control > Phone State Tab >
Select Local Mode > Execute.
Then use Audio Test > HP
microphone in/HP speaker out >
Loop On to enable earpiece.
Talk through the microphone.
Measure MICB1
voltage from MICP
pads. Is it ~2.1 V?
Is the signal going
to the UEM at MICP
and MICN at R2101?
Is the signal going
out of the UEM at
XEAR, pin 11 and 12
on the bottom
connector (X2001)?
Check
connections at
C2105, R2104. If
OK, change UEM.
Check connections
at R2101, R2102,
C2102, C2105,
R2103, C2104, and
R2104. If OK, change
the microphone.
Check L2001, R2003,
and R2002. If OK,
change the UEM.
Retest
NO YES
NO
YES
NO
YES
NO
YES
NO
YES