Audio Troubleshooting; Microphone - Nokia NHL-10 Baseband Troubleshooting And Manual Tuning Manual

NHL-10
Baseband Troubleshooting

Audio troubleshooting

Microphone

START
Check Mic module and PWB
contacts. Are they OK?
Ye s
Set Phone Audio Routing from MIC1
(Hand Portable) to know n w orking
audio output (I.e. EAR [HP] or
HF/HFCM [Ext]). Ensure MIC Bias
[MICB1] is ON.
Is MIC Bias 2.1V non
present at R330 or at
the MIC?
Ye s
Are the audio signals to
UEM OK?
Ye s
Does the audio w ork in
a call?
Ye s
END
ISSUE 2 01/2004
Figure 20: Internal MIC troubleshooting
No
Clean contacts /
replace MIC module
No
Check R330, R332 and
other passive components
in MIC Bias path.
Check audio path through
C330, C331 and associated
passive components. Check
No
for shorts / low impedance to
GND & opens in series
components. Change
passives w here necessary.
No
Change UPP_
WD2
COMPANY CONFIDENTIAL
Copyright © 2003 Nokia. All Rights Reserved.
CCS Technical Documentation
Audio Troubleshooting
Internal MIC
Is MIC Bias 2.1V non No
present at R330 or at
the MIC?
Ye s
Are the audio signals to
No
UEM OK?
Ye s
Change UEM
Change UEM
27