User Guide

5-9 Flow chart of trouble shooting and Circuit Diagram
5-5 Microphone Part
Microphone does not work
Resolder CN503 pin 10, 11 and
ZD109, ZD112
Check
the connection
from CN503 pin 10, 11
U113, U115 pin 2 (AVCC) 2.9V?
Check the circuit
from U108 to U113, U115
Check the circuit related to U463
END
Resolder the R174, R175, R176,
R177, C187, C188 and C204
Yes
No
Yes
Yes
Yes
No
No
Check the Key PCB Replace the Key PCB
No
Yes