LG KG330 Service Manual page 57

4. TROUBLE SHOOTING
Earphone Trouble (1)
Circuit Diagram
DC BLOCKING CAP.
HSO_R
HSO_L
NoRmally High, it goes Low during jack detect
Analog switch for
selecting midi sound or
voice sound for
earphone
HP_PATH_SEL
Mic-bias (the same as main mic)
HSBIAS
HSMIC
C805 100u
R805 4.7
C806 100u
R807 4.7
Close to EAR-JACK
JACK_DET
HOOK_DET
V_IO
C522
0.01u
U504
NLAS5223BMNR2G
1
VCC
2
HF_L
NO1
3
HSO_R
COM1
4
IN1
L506 100nH
5
HSOR
NC1
C524
NA
- 58 -
Close to EAR-JACK
R802
330
C801 C802 C803
47p 10u 10u
R803
2.2K
C804
0.1u
R804
C809 C810
47p 47p
V_IO V_IO
R813
1K
R814
120
HP_PATH_SEL
L
H
10
HF_R
NO2
9
HSO_L
COM2
8
IN2
100nH L504
7
HSOL
NC2
6
GND
C523
NA
INSTPAR
D800
100nH
C811
1000p
VOICE
MP3