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