Microphone Part - Samsung SGH-D520 Service Manual

9-1-4. Microphone Part

Microphone does not work
Is the assembled status
Check the reference voltage on mic path
MICINP
MICOUTP
C414
MICINN
MICOUTN
C419
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Yes
of microphone O.K?
Yes
Yes
C101 ≒ 2.8V ?
Yes
Is microphone ok?
Yes
END
VCCA_2.9V
R411
V400
TA404
C413
R412
R415 C415
R414
C420
R417
R416
No
Reassembled the microphone
Resolder or change
No
R411,R413,R414,R415,R416,R417,
C414,C415
No
Check
R413
C416 C417
C421
9-7
Flow Chart of Troubleshooting
U100
AK_MIC+
C418
VR401
MAIN_MIC_P
MAIN_MIC_N
VR402 VR403
AK_MIC-
C422
VR404