Samsung SGH-X300 User manual

GSM TELEPHONE
SGH-X300
GSM TELEPHONE CONTENTS
1. Specification
2. Flow Chart of Troubleshooting
3. Exploded Views and Parts List
4. Main Electrical Parts List
5. PCB Diagrams
6. Block Diagrams
※ Disassembling Manual
※ Assembling Manual

Samsung Electronics Co.,Ltd.
Code No.: GH68-09643A
2006. 03. Rev.1.0
ⓒ
This Service Manual is a property of Samsung Electronics Co.,Ltd.
Any unauthorized use of Manual can be punished under applicable
International and/or domestic law.

1. SGH-X300 Specification
1-1
1-1. GSM General Specification
GSM900
Phase 1
EGSM 900
Phase 2
DCS1800
Phase 1 PCS1900
Freq. Band[MHz]
Uplink/Downlink
890~915
935~960
880~915
925~960
1710~1785
1805~1880
1850~1910
1930~1990
ARFCN range 1~124 0~124 &
975~1023 512~885 512~810
Tx/Rx spacing 45MHz 45MHz 95MHz 80MHz
Mod. Bit rate/
Bit Period
270.833kbps
3.692us
270.833kbps
3.692us
270.833kbps
3.692us
270.833kbps
3.692us
Time Slot
Period/Frame
Period
576.9us
4.615ms
576.9us
4.615ms
576.9us
4.615ms
576.9us
4.615ms
Modulation 0.3GMSK 0.3GMSK 0.3GMSK 0.3GMSK
MS Power 33dBm~13dBm 33dBm~5dBm 30dBm~0dBm 30dBm~0dBm
Power Class 5pcl ~ 15pcl 5pcl ~ 19pcl 0pcl ~ 15pcl 0pcl ~ 15pcl
Sensitivity -102dBm -102dBm -100dBm -100dBm
TDMA Mux 8 8 8 8
Cell Radius 35Km 35Km 2Km -

SGH-X300 Speclflcation
1-2
1-2. GSM Tx Power Class
TX Power
control level GSM900
5 33±2 dBm
6 31±2 dBm
7 29±2 dBm
8 27±2 dBm
9 25±2 dBm
10 23±2 dBm
11 21±2 dBm
12 19±2 dBm
13 17±2 dBm
14 15±2 dBm
15 13±2 dBm
16 11±3 dBm
17 9±3dBm
18 7±3 dBm
19 5±3 dBm
TX Power
control level DCS1800
0 30±3 dBm
1 28±3 dBm
2 26±3 dBm
3 24±3 dBm
4 22±3 dBm
5 20±3 dBm
6 18±3 dBm
7 16±3 dBm
8 14±3 dBm
9 12±4 dBm
10 10±4 dBm
11 8±4dBm
12 6±4 dBm
13 4±4 dBm
14 2±5 dBm
15 0±5 dBm
TX Power
control level PCS1900
0 30±3 dBm
1 28±3 dBm
2 26±3 dBm
3 24±3 dBm
4 22±3 dBm
5 20±3 dBm
6 18±3 dBm
7 16±3 dBm
8 14±3 dBm
9 12±4 dBm
10 10±4 dBm
11 8±4dBm
12 6±4 dBm
13 4±4 dBm
14 2±5 dBm
15 0±5 dBm

2. SGH-X300 Flow Chart of Troubleshooting
2-1
2-1. Baseband
2-1-1. Power ON
check the current
consumption
>= 100mA Download again
'Power ON' does not work
No
Yes
Yes
END
Yes
Check the Initial Operation
Yes
Charge the battery
No
Check the Voltage
of the Battery
>= 3.3V
check keypad
No
Check the pin C152,
C153,C155,C168 of
U107 is
>=2.8V
Check
"Power On"
key?
No
check U200 and C200
Yes 1
Checktheclocksignalat
pin #4 of OSC100
Freq=26Mhz,
Vrms >=300mV
No Check the clock generation
circuit OSC100
Yes
2

SGH-X300 Flow Chart of Troubleshooting
2-2
1
2
C201
G5
VSS1
K4
VSS2
R2
VSS3
P6
VSS4
A6
VDDB
VDDDN11
L11
VDDV
N5
VDD_IO1
J4
VDD_IO2
C4
VDD_OCTL
M3
N6
VDD3
B4
GND_OCTL
F8
GNDS2
F9
GNDS3
F10
GNDS4
G7
GNDS5
GNDS6G8
G9
GNDS7
G10
GNDS8
H6
GNDS9
P13
GNDV
F6
GNDB
M10
GNDD
F7
GNDS1
H7
GNDS10
GNDS11H8
D13
AUX_ADC3
C200
VCCD VCCA

SGH-X300 Flow Chart of Troubleshooting
2-3
2-1-2. Initial
Initial Failure
check the pin
RSTB of U300 is
LOW? Check U300
No
Yes
Yes
END
Yes
Check the Initial Operation
Yes
Check
R103,R107,R200,C130
No
check the pin CKI
of U300 is 13Mhz?
Check the clock signal
at pin #3 of OSC100
Freq=26Mhz?
No check OSC100
1
Check the pin #9 of U300
is HIGH and pin #11,
#13 is 2.9V?
No Check U200
Yes
2
3
4

SGH-X300 Flow Chart of Troubleshooting
2-4
VRTC
C305
VCC_1.8A
C306 C307 C308
VCCD
VCC_1.8A
F10
XVREF
E15
VSS_DPLL
E10
VSSA
U15
VDDE
VDDEU16
N16
VDDE
VDDEE16
E17
VDDE
VDD_DPLLG16
VRTCD8
VSS
A5
VDD
VDDC16
VDDAC11
B1
VDDE
VDDEB14
VDDEM1
U2
VDDE
VDDEP8
E2
G1
VDD
VDDR1
R4
VDD
VDDT13
R16
VDD
VDDR17
RSTBC12
F12
TDO F15
VDD
F17
CKI
VCCD
VREF
CLK13M_TR
DSP_TDO
TR_RST
R106
R107
C130
R103
C131
R104
13MHZ_BB CLK13M_TR
CLK13M_MC
CLK13M_YMU
2
3
1
4

SGH-X300 Flow Chart of Troubleshooting
2-5
2-1-3. Sim Part
"Insert SIM" is displayed on the LCD
Is there any signal
pin #2,3,4 of CN200?
Check the U200
Check the U200 & U300
END
No
Yes
No
Yes
1
2
Check the SIM Card
The voltage is 2.8V
at the pin#1 of CN200
C206 C208
7
GG 89 GG 10
C207
CN200
11 22
33
44
55
66
UP_IO
R10
UP_RST
J13
VDD12
C11
VDD34
C10
VDD5
B13
VDD67
K14
SIM_CLK
J11
SIM_IO K11
SIM_RST
N9
UP_CLK
P10
C205
C203
VBAT
C204
SIMDATA
SIMCLK
SIMRST

SGH-X300 Flow Chart of Troubleshooting
2-6

SGH-X300 Flow Chart of Troubleshooting
2-7
2-1-4.Microphone Part
* Call with Sim before testing.
Check the soldered
status of microphone
MicroPhone does not work
Resolder microphone
END
No
Yes
Yes
Check the reference
voltage on mic path
R414 ≒2.0V
Yes
Resolder or change
No
Is microphone OK?
Yes
Check U200
No
1
2

SGH-X300 Flow Chart of Troubleshooting
2-8
V411
R414
C412
C405
VCCA
R412
C406
R408
R413
R415
R409
C401
C404
L400
C409
L401
R402
R410
C407
MIC1
C411
R406
C400 V410
R404
C402
C408
R401
C403
MICINP
MICOUTP
MIC+
MIC+
MICMICOUTN
MICINN
1
2

SGH-X300 Flow Chart of Troubleshooting
2-9
2-1-5. Speaker Part
Check the connection
status of LCD connector
CN800
There is no sound from speaker
Are there any signal at
the speaker pad on LCD
PCB?
reconnect CN800
Replace the speaker module
END
No
Yes
No
No
Yes
Check R403, R405 of
U400. Voltage is ≥1V?
1
Yes
Check U600 2

SGH-X300 Flow Chart of Troubleshooting
2-10
1
2

SGH-X300 Flow Chart of Troubleshooting
2-11
2-1-6. LCD backlight
Backlight ON "TIME"
mode in the menu?
Backlight does not work
Check conecting
between PBA and LCD
conector
Select backlight "15 sec" mode
Check FPCB
END
No
Yes
No
Check U701 pin #8 =
10V ? Check the LCD
Yes
Yes
No
L701
R716
Q700
3D
1G 2S
VIN 3
VFB
4
TEST
5
GND
6
SW
7
VOUT
8
GND
9
U702
EN 1
GNDA
2
R717 R719
V717
C704
C705
VBAT
LED-
LED+
BL_DIM
LED_EN

SGH-X300 Flow Chart of Troubleshooting
2-12
2-2. RF
2-2-1. GSM Rx
Normal condition
catch the
channel ?
Check U102
pin 12 ≥-65
dbm ?
Check U101
pin 21,22 ≥-
65dBm ?
Yes
No
No
Check U102
pin 16 ≥-65
dbm ?
Yes
No
Yes
Check ANT, R101,R102,C104,L102
Resolder or change
CN100, L101, L102, C100, C105, C106
Resolder or change
U102
Resolder or change
F100
Resolder or change
U300
CONTINOUS RX ON
RF INPUT : 62CH
AMP : -50dbm
Check U101
pin 13 = 2.9V
Yes
Resolder or change
U200
Yes
No
No
1
2
3
4
5

SGH-X300 Flow Chart of Troubleshooting
2-13
1
2
3
4
5

SGH-X300 Flow Chart of Troubleshooting
2-14
2-2-2. DCS Rx
Normal condition
catch the
channel ?
Check U102
pin 12 ≥-65
dbm ?
Check U101
pin 19,20 ≥-
65dBm ?
Yes
No
No
Check U102
pin 18 ≥-65
dbm ?
Yes
No
Yes
Check ANT,R101,R102,C104,L102
Resolder or change
CN100, L101, L102, C100, C105, C106
Resolder or change
U102
Resolder or change
F100
Resolder or change
U300
CONTINOUS RX ON
RF INPUT : 698CH
AMP : -50dbm
Check U101
pin 13 = 2.9V
Yes
Resolder or change
U200
Yes
No
No
1
2
3
4
5

SGH-X300 Flow Chart of Troubleshooting
2-15
1
2
3
4
5

SGH-X300 Flow Chart of Troubleshooting
2-16
2-2-3. PCS Rx
CONTINOUS RX ON
RF INPUT : 660CH
AMP : -50dbm
Normal condition
catch the
channel ? Check ANT,R101,R102,C104,L102
No 1
Yes
Check U102
pin 12 ≥-65
dbm ? 2
Resolder or change
CN100, L101, L102, C100, C105, C106
No
Yes
Check U102
pin 18 ≥-65
dbm ? Resolder or change
U102
No 3
Yes
Check U101
pin 19,20 ≥-
65dBm ? 4
No Resolder or change
F100
Yes
Check U101
pin 13 = 2.9V No Resolder or change
U200 5
Yes
Resolder or change
U300