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Output device
Headphone right
Speaker left
Speaker right
Internal microphone can be tested by subjective testing. When using internal mic to headphone out loop
connect known working headset (Nokia HS-48) to the device and test if you can hear the sound through the
headsets.
External microphone is tested by feeding test signal to the X4120's pin 3 and gnd.
In this case use input signal presented a table below and check also supposed output.
Fastest and easiest way to test external microphone functionality is to insert known working (HS-48) headset
to the audio connector, enable Ext microphone in Ext earpiece out test audio loop by the Phoenix and just
speak and listen.
Note:
Before testing any microphone path test the headphone output functionality as described on
previous page.
Input terminals
X4120 pin 3 and gnd
Page 6 –38
Output terminals
X4120 pin 4 and gnd
L4150 and L4151 pads
L4144 and L4145 pads
Output terminals
X4120 pin 5 and gnd or X4120
pin 4 and gnd
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Copyright © 2007 Nokia. All rights reserved.
BB Troubleshooting and Manual Tuning Guide
Output voltage (mVrms)
~43mVrms
~300mVrms
~300mVrms
Input signal
Sine 1kHz/10mVrms
RX-34
Output signa
Sine 1kHz/
~65mVrms (without
load)
Issue 2
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