Nokia 7600 - Audio Fault

NMM-3 Company Confidential
6-Troubleshooting CCS Technical Documentation
Page 6-14 Copyright  2003 Nokia Corporation Issue 1 (11/2003)
Company Confidential
Audio Fault
Start
Is the problem with the
Uplink or Downlink?
Does hands free
work?
U
p
linkDownlink
No
TIKU or UEME
Fault
Check contacts and
solder joints of UI
connector X400 and
earpiece connector,
replace earpiece if
necessary. OK?
Y
es
No
Y
es
Is the DC bias
voltage at R405
and R406 ~1.35V?
No
Replace
UEME
End
Measure MIC
Bias voltage
across R104, is it
~2.1V?
Check Microphone and
contacts, R103, R104, R105,
C103, C104 and L102
replace defective part.
No
Y
es
Replace
defective
part