LG U300 Service Manual page 61

3. TECHNICAL BRIEF
Handset main MIC BLK
U502
Audio Amp for loud Speaker
RCV-
RCV+
R621
MID_SPK-
0
VREG_5V
C540 1uF
SPK_AMP_EN
R622
MID_SPK+
0
C519 C526
10u
47p
SP0102BE3
5
G3
4
PWR
3
G2
2
G1
1
OUT
C534
NA
R624 10
R623 10
NA NA
R524 R525
C537 0.1uF C538 NA
R527 3.9K
NA C606 R533 33K
U504 LM4898ITLX-NOPB
B1 C3
VDD VO2
C1 A3
IN- VO1
A1 A2
IN+ BYPASS
C2 B2
SD_SEL SD_MODE
B3
GND
R532 100K
R535 33K
C543 0.1uF
R534 3.9K
C544 NA
NA C607
- 62 -
MICBIAS
MIC
C527 22n
MIC1N
C528 22n
MIC1P
C535
NA
Audio AMP
NC2
A1
NC1
C1
R530 0
NO2
A4
R531 0
NO1
C4
NLAS4684FCT1G
C542
U503
0.1u
C539
L500 22p
COM2 SPK+
A3
L501
COM1 SPK-
C3
C541
IN2 22p
A2
R620 0
SW_EN
IN1
C2
=> Speaker