User Guide

NSB-9
Troubleshooting Instructions CCS Technical Documentation
Page 64 Nokia Corporation Issue 1 04/03
Audio
faults 2
Is the IHF
speaker
working?
Audio
faults 3
Yes
N
o
Measure DC
offset voltage
from speaker
pads (J150 / J151
to GND). Is it
~1.9V?
Check data
communication of
audio amp. control
lines J152, J153,
J154. Is it OK?
IHF 2
Yes
N
o
Set phone in LOCAL mode. Use
Phoenix “Audio Routing and Test
Signals” test. Set output path as IHF
speaker
(1
Check L151,
L152, R162,
C172 and
line. OK?
N
o
Change defected
parts
N
o
Check lines if OK
change UPP.
If NOK change
radio module TB9
Yes
Yes
Change N150
Try to change
IHF speaker.
Is it working
now?
Retest
Yes
N
o
Check IHF
speaker
connections.
Is it OK?
N
o
Change
defected part
and retest
Yes
1) If not working set first “All outputs off” and after that “IHF speaker”