Audio Faults - Nokia NSB-9 Service Manual

NSB-9
Troubleshooting Instructions

Audio faults

Audio
faults 1
Is the earpiece
working ?
Yes
Audio
faults 2
Page 62
No
Try to change the
earpiece. Is it
working now?
No
Set phone to LOCAL mode. Set routing
EXT IN, HP OUT by using phoenix
"Audio Routing and Test Signals" test
Measure DC offset
voltage from earpiece
pads (against GND).
Is it ~1.36V ?
Yes
Measure MICB2 voltage
from XMICP (X102 /
pin10). Is it ~1.9V with
headset?
Yes
Earpiece 2
Nokia Corporation
CCS Technical Documentation
Yes
Retest
Check L150, C180,
No
C181, R152, R153
and line. If OK ->
change UEM
Check L103, R161,
No
C163, C162, R156,
R157, C158, C152,
C159 and line. If OK
-> change UEM
Issue 1 04/03