CCS Technical Documentation
Troubleshooting Instructions
NSB-9
Issue 1 04/03
Nokia Corporation
Page 63
Earpiece
2
Connect external 1kHz (sine
200mVpp) audio signal in XMICP
line and ground line to XMICN
line.
Measure
differential sine
signal from
earpiece pads. Is
it ~190mVpp?
Measure signal
from C152,
(XMICP). Is it
~110mVpp?
Check L150,
R152, R153,
C180, C181 If
still fail, change
UEM
Check L103, L104, R161,
C163, C162, R156, R157,
C158, C152, C159 and
corresponding componenets
from XMICN line.
Retest
No
Yes
Yes
No