Nokia NSB-9 Service Manual page 240

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