LG KM500 Service Manual page 110

7. CIRCUIT DIAGRAM
1 2
3.5phi HEADSET
A
JACK_DETECT_3.5 L300
HS_LOUT
L301
HS_ROUT
C300
82p C301
82p
B
ANALOG SWITCH
(UART3 <=> Bluetooth)
VBAT
C
U302 NLAST9431MT
1 12
UART_RXD NC_A1 COM_D
2 11
BT_NRST SAB NO_D0
3 10
BT_TX NO_B0 SCD
4 9
UART3_TX
COM_B NC_C1
TP301
D
USB BOOT SELECT
VRIO
VRIO
R317
10K
BOOT_SEL
USB_BOOT_SEL
3
R320
Q300
2
VBUS
2SC5585
20K
1
E
1 2
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3 4 5
VRIO
3.5phi
HOOK_DETECT
J300
2
100nH
4
5
6
100nH 3
1
7610-3.5G-SB1-A
C302 C303
47p 47p
OVP
VBAT VCHG_IN
U303 NCP348MTR2G
1 10
IN1 _EN
4 9
IN2 GATE_OUT
5 8 VCHG
UART3_RTS IN3 GATE
BT_RTS
3 7
_FLAG OUT2
UART_CTS
2 6
GND OUT1
11
NC1
12
NC2
BATTERY TEMP & ID
R318
BATT_TEMPS BATT_TEMP
20K
33K C318
R321
47pF
3 4 5
6 7
LAST CALL
VRIO
VRIO
U301 FSA4157L6X
R300
1 6
U300 HOOK_EN S B1
220K
2 5
VCC GND
R301
5
VIN- 3 4
4
A B0
1 VCC
1K
OUT 3 VIN+
GND
2
LMV7291MGX-NOPB
L302
100nH
HSOUTL
HSOUTR
R307
HSMICBIAS
L303
3K
100nH
C308
R308
C304 C305
2.4K 82p
120p 10u
C306
82p
C310
0.1u
HSMICIP
L305
C312
100nH
120p
JACK_TYPE
JACK_DETECT
RPWON
UART3_DSR
MM_USB_EN
VBAT
U305 FSA2268TUMX
10 8
UART_RXD 1B0 1A
1 7
TR_USB_DM
1B1 S1 MM_USB_DM
2 5
UART_TXD 2B0 2A
3 6
TR_USB_DP
2B1 S2
4 9
GND VCC
0.1u MM_USB_DP
C317
- 111 -
8 9 10
VRIO
VRIO VBAT VCHG_IN
18Pin IO Connector
C309
C307
47p
47p
270nH
L304 C311
FB302
FM_ANT
VA300
EVLC14S02050
CN300
R309
21
19
47
1
2
3
FB303 4
5
FB304 6
7
FB305
8
9
10
VBUS
11
FB300 12
13
C313 C314 FB301 14
10u 680n 15
16
UART2_TX
C315
17
UART2_RX
VBAT
1 uF FB306 18
20
22
FSUSB30UMX U304
10 1
SEL HSD1+
9 2
VCC HSD2+
8 3
_OE D+
7 4
HSD1- GND
6 5
HSD2- D-
ZD300 ZD301
LGE Internal Use Only
A
B
10p
C
D