Samsung SGH-B300 Service Manual page 34

ANT
GSM_RX
GSM_TX
DCS_RX
DCS_TX
FM_RADIO
SPK
MAIN_MIC
EAR_SPK
EAR_MIC
POWER_ON
SIM
CHARGING
LCD
MOT
CLK
DPCS_PAM_IN
GSM_PAM_IN
ANT
C109
ANT_PAD1
C137
C136
ANT_PAD2
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26M_OUT
R101
AFC
VCCD_2.9V
C102
C103
VBAT
C105
C106
R102 C107
R103
C110
L101 C115 C117 C114
L106
L105
SERLE
SERCLK
SERDAT
RTXIN
RTXIP
RFS100
C108
L102
L103 L104
PAM100
2
VLOGIC
VMOD_EN
3
R104
VAPC VRAMP
4
TX_EN TX_EN
27
GSM_PAM_IN GSM_IN
29
DPCS_PAM_IN
DCS|PCS_IN
C125 C127 C126
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VRF_2.9V
OSC101
4
3
1
2
C100 C101
RX1900B
VLDO2
RX1900
VLDO1
RX1800B
U100
VBAT
RX1800
VDD
RX900B
VCC_TXVCO
RX900
TXOP_HI
RX850B
TXOP_LO
RX850
VLDO3
GND
C116
C118
C111
VBAT
C119
C120
5
BS1
6
BS2
12
RX1
RX2 13
C128 C129
10-22
Flow Chart of Troubleshooting
RTXQN
RTXQP
C104
PCS1900_LNA_IN_P
PCS1900_LNA_IN_N
DCS1800_LNA_IN_P
DCS1800_LNA_IN_N
GSM900_LNA_IN_P
GSM900_LNA_IN_N
GSM850_LNA_IN_P
GSM850_LNA_IN_N
C121
GSM900_OUT1
BAND_SEL1
5
C122
GSM900_OUT2
BAND_SEL2
GSM900_IN 6
GSM1800_OUT1
7
C123 GSM1800_OUT1
8
GSM1800_IN
C124
F100
GSM850_LNA_IN_P
GSM850_LNA_IN_N
GSM900_LNA_IN_P
GSM900_LNA_IN_N
DCS1800_LNA_IN_P
DCS1800_LNA_IN_N
PCS1900_LNA_IN_P
PCS1900_LNA_IN_N