User Guide

NHM-4
CCS Technical Documentation
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Audio troubleshooting 2
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Audio
faults 2
Is microphone OK ?
Try change grip.
Is it working now ?
Retest
No
Yes
Set phone in LOCAL mode.
Use Phoenix Audio Test.
Set HP IN, EXT OUT, LOOP ON.
No
Measure MICB1
voltage from MICP
Is it ~2.1V ?
Check L104
C107, C152,
R152, R153,
C168, C166,
C215 and line.
If OK –>
Change UEM
No
Check C151,
R157 and line.
If OK –>
Change UEM,
Yes
Audio
faults 3
Yes
pads (C107)
retest..
If fail, change UPP