LG G5300 Service Manual page 97

4. TROUBLE SHOOTING
HEADSET_MIC_P
The direction of the audio
signal from the ear-mic.
AUXIP
HFK_EAR
HEADSET_SPK_P
HEADSET_MIC_P
Ear-mic detection part
3V0_VLCD
C225
C224 10uF
NC
(2012)
3V0_VLCD
U205
MAX4695EGC
10 6
N_C2 N_C1
GOM1 GOM2
11 5
IN1 IN2
12 4
HFK_EAR CONNECTION
0 HEADSET
1 HFK
(2012)
C234 10uF
JACK_DETECT
L201
100nH
C235
47p
This part makes
the mic bias of the ear-mic.
R220
The reference voltage for
2.2K
3V0_VLCD
the hook-detect of ear-mic.
3V0_VLCD
R221
3.3K
R222
1M
U206 MAX9075EXK-T
5
VIN-
4
VCC 1
VIN+ 3 OUT
GND
2
R233
510K
C232
0.1u
C233
R235
0.1u
0
R237
2.2K
HFK_AUXIN
HFK_AUXIP
R240
4.7
C236 C237
R241
47p 47p
1M
- 96 -
HOOK_DETECT
AUXIN
Headset jack
5
1
3
4 J201