Samsung SGH-S400I User manual

I-mode TELEPHONE
SGH-S400i
I-mode TELEPHONE CONTENTS
1. Specification
2. Flow Chart of Troubleshooting
3. Exploded View and Parts List
4. MAIN Electrical Parts List
5. PCB Diagrams
6. Block Diagrams

SAMSUNG Proprietary-Contents may change without notice
1. SGH-S400i Specification
1-1
This Document can not be used without Samsung's authorization
1-1. GSM General Specification
GSM 900 DCS1800 PCS1900
Freq. Band[MHz]
Uplink/Downlink
880~915
925~960
1710~1785
1805~1880
1850~1910
1930~1990
ARFCN range 0~124
&975~1023 512~885 512~810
Tx/Rx spacing 45MHz 95MHz 80MHz
Mod. Bit
rate/
Bit Period
GPRS 270.833Kbps
3.692us
270.833Kbps
3.692us
270.833Kbps
3.692us
EDGE 812.5Kbps
3.692us
812.5Kbps
3.692us
812.5Kbps
3.692us
Time Slot
Period/Frame Period
576.9us
4.615ms
576.9us
4.615ms
576.9us
4.615ms
Modulation
GPRS 0.3GMSK 0.3GMSK 0.3GMSK
EDGE 8PSK 8PSK 8PSK
MS Power
GPRS 33dBm~5dBm 30dBm~0dBm 30dBm~0dBm
EDGE 27~5dBm 26~0dBm 26~0dBm
Power
Level
GPRS 5pcl~19pcl 0pcl~15pcl 0pcl~15pcl
EDGE 8~19(class E2 ) 2~15(class E2) 2~15(class E2)
Sensitivity -102dBm -100dBm -102dBm
TDMA Mux 8 8 8
Cell Radius 35Km 2Km 2Km

SAMSUNG Proprietary-Contents may change without notice
SGH-S400i Specification
1-2
This Document can not be used without Samsung's authorization
1-2. GSM TX power class
TX Power
control
level
GSM900
5 33±2dBm
6 31±3dBm
7 29±3dBm
8 27±3dBm
9 25±3dBm
10 23±3dBm
11 21±3dBm
12 19±3dBm
13 17±3dBm
14 15±3dBm
15 13±3dBm
16 11±5dBm
17 9±5dBm
18 7±5dBm
19 5±5dBm
TX Power
control
level
DCS1800
0 30±2dBm
1 28±3dBm
2 26±3dBm
3 24±3dBm
4 22±3dBm
5 20±3dBm
6 18±3dBm
7 16±3dBm
8 14±3dBm
9 12±4dBm
10 10±4dBm
11 8±4dBm
12 6±4dBm
13 4±4dBm
14 2±5dBm
15 0±5dBm
TX Power
control
level
PCS1900
030±2dBm
128±3dBm
226±3dBm
324±3dBm
422±3dBm
520±3dBm
618±3dBm
716±3dBm
814±3dBm
912±4dBm
10 10±4dBm
11 8±4dBm
12 6±4dBm
13 4±4dBm
14 2±5dBm
15 0±5dBm

SAMSUNG Proprietary-Contents may change without notice
2. SGH-S400i Flow Chart of Troubleshooting
2-1
This Document can not be used without Samsung's authorization
2-1.Baseband
2-1-1. Power ON
'Power On' does not work
Battery Voltage
>= 3.3V
Download again
Charge the Battery
Pin#J12 >= 2.8V Check UCD307 and C332
Pin#A13 and
pin#A14 = 2.9V
Check UCD307 and C329
Freq = 13MHz
Vrms >=300mV
Vpp >= 800mV
Check the clock generation circuit
(related to OSC101)
Check the initial operation
END
No
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
pin#C12 = 1.8V No
Yes
Check the current consumption
Check the pin of UCD307
Checktheclocksignalatpin#3ofOSC101
Current consumption
>= 100mA
Check U311 and C347
pin#10 of U311 =
1.8V
No
Check U312 and C357
pin#10 of U312 =
1.6V
No
Yes
Yes
Check UCD307 and C328

SAMSUNG Proprietary-Contents may change without notice
SGH-S400i Flow Chart of Troubleshooting
2-2
This Document can not be used without Samsung's authorization

SAMSUNG Proprietary-Contents may change without notice
SGH-S400i Flow Chart of Troubleshooting
2-3
This Document can not be used without Samsung's authorization
C347
VCCD_1.6V
4NC
5NC
9
PGND
SW 10
VIN
1
VOUT 6
U312
7
AGND
2AVIN
EN
3
11
GND
MODE/SYNC 8
L303
VCCD_1.8_PSC
VBAT
R344
TA304
TA305
R337
VCCD_1.8_PSC
C357
8
4NC
5NC
9
PGND
SW 10
VIN
1
VOUT 6
U311
7
AGND
2AVIN
EN
3
11
GND
MODE/SYNC
VCCD_1.8V
VBAT
L302
C139
VRF_2.9V
C140
2GND 3
OUT
VCC 4
1
VCON
OSC101
R150
R148
R120
R123
C180
AFC
CLK13M_RF

SAMSUNG Proprietary-Contents may change without notice
SGH-S400i Flow Chart of Troubleshooting
2-4
This Document can not be used without Samsung's authorization
VCCD_1.8V
VRF_2.9V
R376
R317
TP303
VCCD_2.9V
C312C313
VRF_2.9V
VCCD_1.8V
VRTC_1.5V
C311
R336
TP305
C337
C328
R322
C332
4
4
3
C
TH300
3
4
3
C
R370
VCCD_2.9V
VPAC_2.8V
C310
C331
VCCA_2.9V
R323
R367
VBAT
R331
C333
C327
C339
VCCD_1.8_PSC
VSYN_2.8V
R335
C329
R368
R327
P
G
E
R
V
3
1
M
VRTCH11
VSIM K12
1
S
S
V5
G
2
S
S
V4
K
3
S
S
V2
R
4
S
S
V6
P
M
C
V
X
V
3
1
R
Q
A
N
E
O
X
1
D
C9
VL5S_B
VLDO_1G11
VLDO_2J12
VLDO_3A13
VLDO_4B12
VLDO_5B10
VLDO_6A14
VLDO_7C12
VREFA10
N
G
E
R
V
4
1
R
D
D
D
V1
1
N
V
D
D
V1
1
L
1
O
I
_
D
D
V5
N
2
O
I
_
D
D
V4
J
L
T
C
O
_
D
D
V4
C
VEXTE14
VIB_DRVF15
N
E
_
G
N
R
_
B
I
V
9
L
VL4S_AA12
VL4S_BB11
VL5S_AD10
R10
VACCF14
VBATE13
1
D
D
V3
J
VDD12J13
2
D
D
V3
M
3
D
D
V6
N
VDD34C11
5
D
D
V0
1
C
7
6
D
D
V3
1
B
B
D
D
V6
A
SERCK
C2
C1SERDA
B1SERLE1
SERLE2
A2
SIM_CLKK14
SIM_IOJ11
SIM_RSTK11
P
X
T
7
E
UP_CLKN9
UP_IOP10
UP_RST
RING_DRVF13
RTC_ALMNH10
K
L
C
_
C
T
R
4
N
RWN
L2
N
I
X
T
X
R
6
D
PI
X
T
X
R
7
D
N
Q
X
T
X
R
6
C
P
Q
X
T
X
R
7
C
SCLK_PSCL8
M7
SDI_PSC
SDO_PSCN7
OCTL5
OCTL6
B3
A3OCTL7
F
U
B
_
1
W
S
P
7
L
P
E
E
K
_
R
W
P
9
M
N
1
W
S
_
R
W
P
5
1
C
2
W
S
_
R
W
P
4
1
C
1
F
E
R
A
R
6
B
2
F
E
R
A
R
5
B
R3RESETN_CSP
O
_
T
E
S
E
R
9
K
N
T
U
O
CI
M
5
1
P
P
T
U
O
CI
M
5
1
N
E
D
O
M
0
1
N
1
5
C
N
6
C
N2
OCTL0
E6
C5OCTL1
OCTL2
F5
E5OCTL3
OCTL4
A4
G6
R
U
C
H
_
D
N
G1
1
F
L
T
C
O
_
D
N
G4
B
1
C
S
P
_
D
N
G5
1
B
2
C
S
P
_
D
N
G5
1
K
Q
R
T
NI
0
1
L
L3I|O
LED1_DRVG13
LED2_DRVG12
C
M
6
R
N
NI
CI
M
4
1
M
P
NI
CI
M
4
1
N
0
1
J
7
1
S
D
N
G0
1
K
2
S
D
N
G8
F
3
S
D
N
G9
F
4
S
D
N
G0
1
F
5
S
D
N
G7
G
6
S
D
N
G8
G
7
S
D
N
G9
G
8
S
D
N
G0
1
G
9
S
D
N
G6
H
V
D
N
G3
1
P
3
P
B
D
N
G6
F
D
D
N
G0
1
M
Q
D
N
G8
E
1
S
D
N
G7
F
0
1
S
D
N
G7
H
1
1
S
D
N
G8
H
9
H
2
1
S
D
N
G
3
1
S
D
N
G7
J
4
1
S
D
N
G8
J
5
1
S
D
N
G9
J
6
1
S
D
N
G
DB14
D3
DB15
D2
DB2
K3
J5DB3
DB4
J6
DB5
H5
DB6
G3
DB7
G4
DB8
F4
DB9
F1
R
T
N
I
D
CSN_PSC
K
C
I
A
D
4
R
I
D
I
A
D
6
L
O
DI
A
D
6
M
N
RI
A
D
4
P
DB0
K1
K2DB1
DB10
F2
DB11
F3
DB12
E2
DB13
E3
2
1
P
P
B
T
U
O
A
2
1
R
N
N
I
X
U
A
4
1
L
P
NI
X
U
A
5
1
M
N
T
U
O
X
U
A
3
1
L
P
T
U
O
X
U
A
3
1
K
3
C
D
A
_
X
U
A3
1
D
CH_BDRVE11
CH_ISENF12
CH_RESD14
E9
CREF
K8
M2AB5
AB6
M1
K7AB7
AB8
K5
ADC_AUX1E10
ADC_AUX2D15
4
X
U
A
_
C
D
A
5
P
C
F
A
9
D
N
A
T
U
O
A
2
1
N
P
A
T
U
O
A
1
1
P
N
B
T
U
O
A
UCD307
AB0
K6
P1AB1
AB2
L5
N1AB3
AB4
N2
VSYN_2.8V
C334
VCCA_2.9V
BAT300
1
2
R314
R329
C340
C335
R371
C316
TP302
VBAT
R325
TP301
VBAT
VCCD_2.9V
VCCD_2.9V
FLASH_RESET
VSIM
Q
A
N
E
O
X
NI
X
R
T
PI
X
R
T
N
Q
X
R
T
P
Q
X
R
T
UP_SCLK
UP_SDI
UP_SDO
SIM_CLK
SIM_IO
SIM_RST
C
P
A
V
SIMCLK
SIMDATA
SIMRST
GSM_TX_EN
DCS_TX_EN
INTRQ
KEY_BL1
SVC_EN
C
M
_
M
3
1
K
L
C
N
NI
CI
M
P
NI
CI
M
N
T
U
O
C
I
M
P
T
U
O
CI
M
F
U
B
_
1
W
S
P
PWR_KEEP
N
O
_
R
W
P
N
O
_
GI
J
RST
RTCALARM
K
2
3
K
L
C
PAC_EN
TX_EN
SX_EN
RX_EN
C
F
A
N
A
T
U
O
A
P
A
T
U
O
A
N
B
T
U
O
A
P
B
T
U
O
A
N
NI
X
U
A
P
NI
X
U
A
N
T
U
O
X
U
A
P
T
U
O
X
U
A
EAR_CHECK
ICHRG
UP_CS
T
N
I
_
P
S
D
SERDAT
SERCLK
DSP_RWN
DSP_IO
DSP_DB(9)
DSP_DB(8)
DSP_DB(7)
DSP_DB(6)
DSP_DB(5)
DSP_DB(4)
DSP_DB(3)
DSP_DB(2)
DSP_DB(15)
DSP_DB(14)
DSP_DB(13)
DSP_DB(12)
DSP_DB(11)
DSP_DB(10)
DSP_DB(1)
DSP_DB(0)
DSP_AB(8)
DSP_AB(7)
DSP_AB(6)
DSP_AB(5)
DSP_AB(4)
DSP_AB(3)
DSP_AB(2)
DSP_AB(1)
DSP_AB(0)
SERLEBP_VF
DSP_DB(0:15)
DSP_AB(0:8)

SAMSUNG Proprietary-Contents may change without notice
SGH-S400i Flow Chart of Troubleshooting
2-5
This Document can not be used without Samsung's authorization
2-1-2. Initial
Initial Failure
pin#C12 of UCD307 = 1.8V Check the UCD307
(if it has some problem, it is to be replaced.)
Yes
No
Is the pin #K9 of UCD307
"Low →High" ?
Yes
No Check the UCD307
(if it has some problem, it is to be replaced.)
There is 32.768kHz wave
forms at the C220 and
C221
Yes
No
Check the UCP201
The voltage is "High" at
the C328,C329,C332 Check the UCD307
LCD display is O.K
No
Yes
Yes
Yes
Check the LCD part
No
Sound is O.K
Yes
No
Check the Audio part
END
Yes
pin#10 of U311 = 1.8V Check the U311
(if it has some problem, it is to be replaced.)
No
pin#10 of U312 = 1.6V Check the U312
(if it has some problem, it is to be replaced.)
No
pin#J12 of UCD307 = 2.9V Check the UCD307
(if it has some problem, it is to be replaced.)
No
Yes
Yes

SAMSUNG Proprietary-Contents may change without notice
SGH-S400i Flow Chart of Troubleshooting
2-6
This Document can not be used without Samsung's authorization
V211
C203
VRTC_1.5V
4
S
S
V
5
S
S
V8
H
9
H
6
S
S
V
7
S
S
V0
1
H
1
1
H
8
S
S
V
9
S
S
V2
1
H
D
_
A
S
S
V1
1
R
U
_
A
S
S
V8
1
F
C
T
R
1
X
9
1
H
9
1
FC
T
R
2
X
0
1
S
S
V
1
1
S
S
V8
K
7
L
2
1
S
S
V
3
1
S
S
V8
L
8
M
4
1
S
S
V
5
1
S
S
V9
M
0
1
M
6
1
S
S
V
7
1
S
S
V1
1
M
2
1
M
8
1
S
S
V
8
1
A
2
S
S
V
3
S
S
V8
G
9
G
6
B
2
_
8
P
1
_
O
I
_
D
D
V
3
_
8
P
1
_
O
I
_
D
D
V2
1
B
6
1
B
4
_
8
P
1
_
O
I
_
D
D
V
5
_
8
P
1
_
O
I
_
D
D
V1
C
4
1
C
6
_
8
P
1
_
OI
_
D
D
V
7
_
8
P
1
_
O
I
_
D
D
V9
D
8
1
D
8
_
8
P
1
_
O
I
_
D
D
V
9
_
8
P
1
_
OI
_
D
D
V1
F
8
1
G
C
T
R
V
1
S
S
V2
A
2
1
J
8
E
R
O
C
_
D
D
V
1
_
8
P
1
_
OI
_
D
D
V4
B
4
L
0
1
_
8
P
1
_
O
I
_
D
D
V
1
1
_
8
P
1
_
O
I
_
D
D
V6
1
L
1
P
2
1
_
8
P
1
_
O
I
_
D
D
V
3
1
_
8
P
1
_
OI
_
D
D
V8
1
T
1
U
4
1
_
8
P
1
_
OI
_
D
D
V
5
1
_
8
P
1
_
OI
_
D
D
V5
U
2
1
U
6
1
_
8
P
1
_
O
I
_
D
D
V
7
1
_
8
P
1
_
OI
_
D
D
V8
W
8
1
W
8
1
_
8
P
1
_
O
I
_
D
D
V
3
M
1
X
T
7
K
1
1
T
D
_
A
D
D
V
7
1
F
U
_
A
D
D
V
1
E
R
O
C
_
D
D
V8
B
3
1
B
2
E
R
O
C
_
D
D
V
3
E
R
O
C
_
D
D
V2
G
8
1
H
4
E
R
O
C
_
D
D
V
5
E
R
O
C
_
D
D
V2
M
8
1
N
6
E
R
O
C
_
D
D
V
7
E
R
O
C
_
D
D
V7
V
3
1
V
D
S
2I
_
0
D
X
T
P
S
2
U
N16
SPTXD1_I2SD_PIO16
TCK U14
V14
TDI
TDO T12
TEST1 U15
T14
TEST2
TEST3 V16
S
M
T4
1
W
2
1
R
N
T
S
R
T
0
X
T
RWN
1
M8
2
Q
R
I
_
0
X
R
6
L8
2
Q
R
I
_
1
X
R
K
L
C
MI
S
4
P
2
TOI
MI
S
3
R0
K
L
C
P
S
M18
SPCLK1_PIO18
3
T0
S
F
P
S
SPFS1_PIO15 N15
0
D
X
R
P
S
4
R
SPRXD1_PIO17 M17
N
E
_
D
M
C
_
I
C
M
_
9
3
O
I
P
N
E
_
T
A
D
_I
C
M
_
0
4
OI
P
4
1
M
6
1
RX
T
A
D
RI
_
1
4
OI
P
X
R
A
D
RI
_
2
4
OI
P
7
1
R
4
1
NN
E
_
0
T
A
D
_
I
C
M
_
3
4
O
I
P
J16
PIO47
5
G6
4
O
I
P
_
1
M
W
P
N
T
S
E
R5
1
G
1
0
O
I
P
_
O
I
R
3
P
N
M
R
A
L
A
C
T
R
7
1
H
2
N4
0
O
I
P
_
0
S
T
R
V6
7
1
W8
2
O
I
P
E14 PIO30_WAITN
P12
PIO31_IRQ6
2
3
O
I
P
3
1
R
U18
PIO33
PIO34 R14
PIO35_A_A25_BOOTSEL
F2
6
1
FN
E
O
_
B
S
U
_
6
3
O
I
P
A
T
A
D
_
B
S
U
_
7
3
OI
P
7
1
E
5
1
JK
L
C
_
I
C
M
_
8
3
O
I
P
4
1
L
6
1
E
5
PT
S
R
M
I
S
_
4
1
O
I
P
5
1
PP
E
E
K
R
W
P
_
9
1
O
I
P
Q
E
R
K
L
C
S
Y
S
_
0
2
O
I
P
9
1
P
3
1
K0
T
A
D
_I
C
M
_
1
2
OI
P
1
T
A
D
_
I
C
M
_
2
2
O
I
P
2
1
L
3
1
L2
T
A
D
_
I
C
M
_
3
2
O
I
P
3
T
A
D
_
I
C
M
_
4
2
O
I
P
5
1
L
9
1
V5
2
OI
P
6
2
OI
P
6
1
U
7
2
OI
P
9
1
U
6
G
1
1
C
N
2
C
N2
6
1
GT
U
O
2
3
C
S
O
PIO00_IRQ5 P16
P
S
U
S
_
B
S
U
_
7
0
O
I
P
9
1
B
D
M
C
_
I
C
M
_
8
0
O
I
P
3
1
J
9
1
CI
P
V
_
B
S
U
_
9
0
OI
P
0
1
O
I
P
7
1
V
I
M
V
_
B
S
U
_
1
1
O
I
P
8
1
C
7
1
DO
P
V
_
B
S
U
_
2
1
OI
P
O
M
V
_
B
S
U
_
3
1
OI
P
1
D
R
B
Y
E
K
6
J
4
G0
1
D
R
B
Y
E
K
1
1
D
R
B
Y
E
K
2
H
5
J2
D
R
B
Y
E
K
3
D
R
B
Y
E
K
4
J
8
J4
D
R
B
Y
E
K
F
U
B
_
1
W
S
P
_
5
D
R
B
Y
E
K
6
H
4
H6
D
R
B
Y
E
K
7
D
R
B
Y
E
K
1
H
3
H8
D
R
B
Y
E
K
9
D
R
B
Y
E
K
R9
FLASHRSTN
H14
T15
INT0
IO W6
V12
IOBIT0_PIO05
IOBIT1_PIO06 N11
IRQ1 M16
M19
IRQ2
IRQ3 P17
P18
IRQ4
7
J0
D
R
B
Y
E
K
D_D12
D_D13 N9
N10
D_D14
D_D15 P11
R7
D_D2
D_D3 T7
R8
D_D4
D_D5 V8
U8
D_D6
D_D7 T8
T9
D_D8
D_D9
D_A3 V3
U4
D_A4
D_A5 T5
V4
D_A6
D_A7 N6
R6
D_A8
U6
D_D0
D_D1 T6
P8
D_D10
D_D11 P9
N8
A_WEN
2
1
W
I
K
C
N12
CKO_IACK
T17
CPTSTSTOP_CKO
9
2
O
I
P
_
0
S
T
C
6
M
5
N4
4
OI
P
_
0
D
C
D
2
P2
0
OI
P
_
0
R
S
D
3
0
OI
P
_
0
R
T
D
4
N
V1
D_A0
D_A1 W2
W3
D_A2
A_D14
A_D15
D13
F9 A_D2
A_D3
G10
G11 A_D4
A_D5
F11
E11 A_D6
A_D7
G12
D11 A_D8
A_D9
E12
A_OEN
B14
D14
D15 A_CS4N
A_CS5N
C16
F15 A_CS6N
A_CS7N
B17
A8 A_D0
A_D1
E9
C12 A_D10
A_D11
A12
F12 A_D12
A_D13
D12
E13
C5
D7 A_A6
A_A7
E7
C4 A_A8
A_A9
C2
H16 A_BE0N
A_BE1N
A17
A14 A_CS0N
A_CS1N
C15
G14 A_CS2N
A_CS3N
J14
F8
A_A18
E6
A_A19
D2
A_A2
D8
E4 A_A20
A_A21
E3
F5 A_A22
A_A23
F4
F3 A_A24
A_A3
A6
C6 A_A4
A_A5
ATMS_PIO45 K12
B7 A_A0
A_A1
C8
A3 A_A10
A_A11
B3
B1 A_A12
A_A13
D6
D5 A_A14
A_A15
D3
E8 A_A16
A_A17
UCP201
M4
ATCK_CTS1
ATDI_RTS1 L5
T13
ATDO_PWM2
C205 C208
VCCD_1.8V
C210
R203
10K
C204
VCCD_1.6V
C209 C211
C221
1
0
2
F
R206
C206
VCCD_1.6V
R221
C222 C223
OSC200
C207
C220
PCM_SYNC
UP_SDO
PCM_OUT
UP_SDI
PCM_IN
BT_TXD
SDS_TXD
USB_DATA
VCAM_EN
VDD_AC_ON
M_HOLD
BACKLIGHT_EN
TR_RST
RTCALARM
BT_RTS
DSP_RWN
BT_RXD
SDS_RXD
SIMCLK
SIMDATA
UP_SCLK
PCM_CLK
UP_CS
USB_SUSP
SPK_PHONE_EN
USB_DET
DACPW_ON
USB_VPO
USB_VMO
SIMRST
PWR_KEEP
XOENAQ
P_MODE
AMP_SHDN
EAR_SEL
CHG_DET
EAR_SWITCH
CHG_ON
LED_DATA
USB_CON
USB_OEN
DSP_IO
SPK_SEL
FLASH_EN
INTRQ
JACK_IN
YMU_IRQ
HERA_INT
KEY_COL(0)
KEY_COL(1)
KEY_ROW(4)
KEY_COL(2)
KEY_COL(3)
KEY_COL(4)
PSW1_BUF
KEY_ROW(0)
KEY_ROW(1)
KEY_ROW(2)
KEY_ROW(3)
CLK32K
HALL_SENSOR
DSP_DB(1)
DSP_DB(10)
DSP_DB(11)
DSP_DB(12)
DSP_DB(13)
DSP_DB(14)
DSP_DB(15)
DSP_DB(2)
DSP_DB(3)
DSP_DB(4)
DSP_DB(5)
DSP_DB(6)
DSP_DB(7)
DSP_DB(8)
DSP_DB(9)
DSP_INT
CLK13M_TR
BT_CTS
MIC_SEL
VBT_EN
DSP_AB(0)
DSP_AB(1)
DSP_AB(2)
DSP_AB(3)
DSP_AB(4)
DSP_AB(5)
DSP_AB(6)
DSP_AB(7)
DSP_AB(8)
DSP_DB(0)
KEY_ROW(0:4)
CP_TCK
CP_TDI
CP_TDO
CP_TMS
ROM2_CS
A(0)
D(0:15)
D(14)
D(13)
D(12)
D(11)
D(10)
D(9)
D(8)
D(7)
D(6)
D(5)
D(4)
D(3)
D(2)
D(1)
D(0)
DSP_DB(0:15)
DSP_AB(0:8)
KEY_COL(0:4)
LOWER_BYTE
YMU_CS
HERA_CS
RAM_CS
D(15)
CP_WEN
A(0:24)
A(24)
A(23)
A(22)
A(21)
A(20)
A(19)
A(18)
A(17)
A(16)
A(15)
A(14)
A(13)
A(12)
A(11)
A(10)
A(9)
A(8)
A(7)
A(6)
A(5)
A(4)
A(3)
A(2)
A(1)
CP_OEN
FLASH_RESET
ROM1_CS
UPPER_BYTE

SAMSUNG Proprietary-Contents may change without notice
SGH-S400i Flow Chart of Troubleshooting
2-7
This Document can not be used without Samsung's authorization
2-1-3. Sim Part
Check the voltage at
pin#1 of SIM301 >=
2.8V ?
"Insert SIM is displayed on the LCD
Check the SIM
connector's (SIM301)
connection to SIM card
Check the UCD307
Resolder or change SIM301
END
No
Yes
Yes
Yes
Yes
No
No
Is there any signals
pin#2,#3,#6 of SIM301 ? Check the UCP201
Check the SIM Card