NSB-9
Troubleshooting Instructions
CCS Technical Documentation
Page 66
Nokia Corporation
Issue 1 04/03
Audio
faults 3
Is the
External
Audio out
working?
Audio
faults 4
Yes
No
Measure DC offset
voltage from
HSEAR P&N and
HSEAR R P&N
lines. Is it ~2.0V?
Check data
communication of
audio pa control lines
J152, J153, J154. Is
it OK?
Ext. audio
out 2
Yes
No
Set phone in LOCAL mode. Use Phoenix
“Audio Routing and Test Signals” test. Set
output path as HP speaker. Insert headset to
route audio to HSEAR
(2
Check X102
L103 - L106, C108 -
C111, C115 - C118,
R111 - R114, C165,
C167, R164 - R167
and line. OK?
No
Change defected
parts
No
Check lines if OK
change UPP.
If NOK change
radio module
TB9
Yes
Yes
Change N150
Check system
connector and
soldering. Are
they OK?
No
Change defected
part and retest
2) If not working set first “All outputs off” and after that “HP speaker”, after that insert headset again