Flow Chart of Troubleshooting
9-1-5. Microphone Part
Microphone does not work
Check the
assembled status of
microphone.
YES
Check the reference
voltage on mic path
R435=2.9V
YES
Is microphone ok?
YES
END
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NO
NO
NO
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Reassemblage microphone
resolder or change
( R 4 3 5 ,R 4 3 8 , R 4 3 9 , R 4 4 0 ,
R 4 4 3 , C 4 4 0 , C 44 3 , U 4 0 7 )
Check U300
9-8