Baseband Troubleshooting Instructions
CCS Technical Documentation
Page 50
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Nokia Corporation
Issue 1 10/02
Audio
faults 3
Is buzzer
(B301) working?
Measure VBAT
voltage from B301.
Is it OK?
No
Check VBAT
line.
No
Set phone in LOCAL mode. Use
Phoenix Audio Test. Set buzzer
frequency 3100 Hz and strength e.g. 5.
Then set volume on.
Yes
Measure
buzzer control
signal from (C307).
Is it 3.1 kHz
pulses?
Change
buzzer
(B301).
Yes
Check C306,
C307, C308,
and line.
If OK ->
change UEM.
No
END
Yes