Nokia RH-66 Troubleshooting Manual page 44

2115i/2116/2116i (RH-66)
Baseband Description and Troubleshooting
Audio
Faults
Page 2
Is the
microphone
working?
YES
Audio
Faults
Page 3
Page 44
Change the
microphone. Is it
NO
working now?
NO
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?
YES
Is the signal going
to the UEM at MICP
and MICN at R2101?
YES
Is the signal going
out of the UEM at
XEAR, pin 11 and 12
on the bottom
connector (X2001)?
©2005 Nokia Corporation
Retest
YES
connections at
NO
C2105, R2104. If
OK, change UEM.
Check connections
at R2101, R2102,
C2102, C2105,
NO
R2103, C2104, and
R2104. If OK, change
the microphone.
Check L2001, R2003,
and R2002. If OK,
NO
change the UEM.
YES
Company Confidential
Check
Retest
Issue 1 03/2005