LG KF690 Service Manual page 51

Handset main MIC
SPM0204LE5-QB
MIC100
Speaker Amp
C504
LINE_ON
C505
LINE_OP
SPK_AMP_EN
LGE Internal Use Only
G4
6
PWR
5
G3
4
G2
3
G1
2
OUT
1
MIC
47n R505 10K
47n R507 10K
TP504
C507
220n
SPEAKER AMP
[Fig. 3.23] MIC & Speaker amp schematic
- 52 -
C103 C104
10u 47p
C105 0.1u
C106 0.1u
+VPWR
R501 62K
R502 62K
U504 TPA6205A1ZQVR
C3 A3
IN- VDD
C2 B3
IN+ VO+
B1 A1
_SHUTDOWN VO-
C1 B2
BYPASS GND
EUSY0335701
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
MICBIAS
MIC1N
MIC1P
FB501
C502 C500
1u 10u
SPK-
SPK+