Microphone - Nokia NPD-1 Series Troubleshooting - Bb

CCS Technical Documentation

Microphone

Audio
faults 2
Is the m icrophone
working?
Audio
faults 3
Issue 1 11/2002
No
Is it working now?
Yes
Set phone in LOCAL m ode.
Use Phoenix "Baseband Audio
Control" and set the following: Enable
Tx, Enable Rx, Select MIC1, Enable
HF only (differential ended).
Talk throug the m ichrophone.
For AM S, set voice loopback on the
call box and m ake a phone call
Measure MICB1
at C195 is it~2.1V?
Is the signal going
to the UEM at MICP
and MICN at L122
Is the signal going
out of the UEM at
XEAR, pin 10 on the
bottom connector ?
Nokia Corporation
Yes
Change the
m ichropone.
No
No
Yes
No
and C174?
Yes
No
Yes
Confidential
NPD-1
Troubleshooting — BB
Retest
Check C195, R176,
R178, .
If OK change UEM.
If connection is OK
at C175, C174, and
L122, then change
m icrophone.
Check R160 if it is
shorted to GND.
If OK change UEM.
Retest
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