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Flow Chart of Troubleshooting
9-7
9-1-4.Microphone Part
* Call with Sim before testing.
Check the soldered status
of microphone
MicroPhone does not work
Resolder microphone
END
No
Yes
Yes
Check the reference
voltage on mic path
R337
≒
2.0V
Yes
Check
R339,R341,R338,R340,C380,C381,R337,
C363,TA304,R332,C362
No
Is microphone OK?
Yes
Check
U100
No
1
2
R337
VCCA_2.9V
R338
R332
C380
C381
R340
R336
C317
C362
2
03
R
V
R341
0
03
CI
M
R339
1
03
R
V
C363
TA304
MICOUTP
MICINP
MICINN
MICOUTN