Nokia NSB-9 Service Manual page 238

NSB-9
Troubleshooting Instructions
Audio
faults 2
Is the IHF
speaker
working?
Yes
pads (J150 / J151
Audio
faults 3
1) If not working set first "All outputs off" and after that "IHF speaker"
Page 64
Change
defected part
and retest
No
Check IHF
No
speaker
connections.
Is it OK?
Set phone in LOCAL mode. Use
Phoenix "Audio Routing and Test
Signals" test. Set output path as IHF
(1
speaker
Measure DC
No
offset voltage
from speaker
to GND). Is it
~1.9V?
Yes
IHF 2
Nokia Corporation
CCS Technical Documentation
Try to change
Yes
IHF speaker.
Is it working
now?
No
Check L151,
L152, R162,
C172 and
line. OK?
Yes
Check data
communication of
audio amp. control
lines J152, J153,
J154. Is it OK?
Yes
Change N150
Yes
Retest
No Change defected
parts
Check lines if OK
No
change UPP.
If NOK change
radio module TB9
Issue 1 04/03