Flow Chart of Troubleshooting and Circuit Diagrams
5-9
5-5 Microphone Part
Microphone does not work
Resolder U400
U400 pin 4, 5 = short?
U619 pin 3 (AVCC) 2.5V?
Check the circuit
from U618 to MIC1
Check the circuit related to U619
END
Resolder the
R444,R445,R446,R447,
C446,C450,C451
Yes
No
Yes
Yes
Yes
No
No
Check the tension of MIC Module
Replace the Mic or Mic Holder
No
Yes