CCS Technical Documentation
Troubleshooting Instructions
NSB-9
Issue 1 04/03
Nokia Corporation
Page 69
Audio
faults 5
Is external
microphone
working ?
Check system
connector X102. Is
it OK ?
Change defect part and
retest
END
Yes
No
No
Yes
Set phone in LOCAL mode. Use Phoenix
“Audio Routing and Test Signals” Test. Set
routing Ext in HP out
(4
Measure sine signal
from EARP and EARN
lines. Is it ~190mVpp?
Yes
No
Check if external
audio device is OK?
Retest with
undamaged ext. audio
device.
No
Yes
Measure MICB2 voltage
from XMICP (X102 / pin
10). Is it ~2.0V with
headset?
Check L103, R161, C163,
C162, R157, C158 and line. If
OK -> change UEM
Retest
Yes
Yes
No
Connect external 1kHz (sine 200mVpp)
audio signal in XMICP line and ground line
to XMICN line.
Measure signal
from C152. Is it
~110mVpp?
Check C159 If OK, change
UEM
Yes
Check L103, R161, C163, C162, R156,
R157, C158, C152, C159 and also
corresponding componenets from
XMICN line line. Change defect part.
No
4) If not working set “Loops Off” and after that “Ext in HP out” again
Содержание NSB-9
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