LG G5200 Service Manual page 89

4. TROUBLE SHOOTING
To U103(AD6521)
The voltage input of
ear-mic hook-detect
The voltage input of
ear-mic detect
Ear-mic detection part
Refer to the page 2 of the complete
circuit diagram for detail.
The circuit diagram of the ear-mic jack
Refer to the page 2 of the complete circuit diagram for detail.
The direction of the audio
The reference voltage
for the hook-detect of
U204 selects the path of audio
signal for the ear-mic or the HFK.
Refer to the page 2 of the complete circuit diagram
for detail.
- 88 -
This part makes the
mic bias of the ear-mic.
Mic bias and path for the ear-mic
Refer to the page 1 of the complete
circuit diagram for detail.
These resistors make
the reference voltage.
The reference voltage
for the detect of ear-
mic.
The signal flow when the
ear-mic is activated.