Nokia NSB-9 Service Manual page 237

CCS Technical Documentation
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?
Yes
Retest
Issue 1 04/03
Measure signal
No
from C152,
(XMICP). Is it
~110mVpp?
Nokia Corporation
Troubleshooting Instructions
Check L150,
R152, R153,
Yes
C180, C181 If
still fail, change
No
Check L103, L104, R161,
C163, C162, R156, R157,
C158, C152, C159 and
corresponding componenets
from XMICN line.
NSB-9
UEM
Page 63