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4.12.3 Checking Flow
Does the audio profile
of the phone change to
the earphone mode ?
YES
YES
Check voltage level of
R304 (TP30)VMIC =
YES
Check component status
around VMIC
Check the signal level
and R300,R302(TP28) .
Is it about 1.2~1.5VDC
with a few tens mV
NO
Replace U100 (BB) or Change
another Ear-Mic and Try again .
Start
MIC
2.2V?
YES
AC ?
NO
NO
Check U100(EGV)
NO
Re-solder or replace the
component
YES
Re-solder cause
component (J300)
-67-
Earphone
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