User Guide

NHM-4
CCS Technical Documentation
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Earpiece troubleshooting
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Page 27
Nokia Corporation
Connect EXT audio signal 1kHz
(sine) (¨200mVp–p) in XMICP pads (C105)
and Ground in XMICN (C103)
sine signal
from earpiece pads.
Is it ~880mVp–p ?
Earpiece
from UEM (R156)
Is it ~130mVp–p ?
No
Retest
Yes
Change UEM.
Yes
Check R156, C153,
C155, R166, R167,
C163, R161 and
line.
No
Measure Measure
sine signal