User Guide

CCS Technical Documentation
NHM-4
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Audio troubleshooting 3
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Audio troubleshooting 3
Audio
faults 3
Is BUZZER working?
Measure VBATT
voltage from B301.
Is it OK?
No
Check VBATT
line
No
Set phone in LOCAL mode.
Use Phoenix Audio Test.
Set Buzzer volume ON.
Yes
buzzer control
signal from
BUZZER (C326)
Is it 1kHz
Change
BUZZER
(B301)
Yes
Check C306,
C307, C308
and line.
IF OK –>
Change UEM
No
END
Yes
Measure
pulses?