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Flow Chart of Troubleshooting
3-1-5. Microphone Part
Microphone does not work
assembled status of
microphone.
Check the reference
voltage on mic path
Is microphone ok?
MONO1_IN_P
R412
22K
C415
1000nF
10V
MONO1_IN_N
C418
NC
Check the
NO
YES
NO
R408=2.4V
YES
NO
YES
END
C409
R409
68NF 10V
0
C412
NC
C414
120PF
50V
R414
0
C416
R418
68NF
2.2K,1%
10V
R407
2.2K,1%
MIC+
C413
120PF
50V
MIC-
C419
120PF
50V
3-13
Reassemblage microphone
①
resolder or change
(R408, C408)
Check
UCD300
R408
680
6.3V
33uF
C408
VAMICREF
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