
Developer's Board Manual Rev A
Page 28 of 28
SEM/CX-02:0061/MAN
4.3.1 Development System FAQ
1) The microphone does not work.
– Make sure that the S201 switch is in PRE-AMP position and that ATMS from the application is disconnected
from the header connector.
2) The earpiece volume is low.
– Increase the volume inside the module by sending “AT+CLVL=8” (8 = Highest volume, 0 = Mute).
– Change the developer’s board volume by rotating the R230 potentiometer.
3) Neither the microphone nor the earpiece works.
– Make sure the headset is properly inserted (J201).