Samsung SGH-C250 Service Manual
GSM TELEPHONE
SGH-C250
GSM TELEPHONE
CONTENTS
1. Specification
2. Exploded View and Parts list
3. Chart of Troubleshooting
4. Array course control
5. Block Diagrams
6. PCB Diagrams
7. MAIN Electrical Parts List
8. Reference data
9. Safety Precautions
10. Product Function
Contents
1. Specification
1-1. GSM General Specification .......................................................................................1-1
1-2. GSM TX power class ...............................................................................................1-2
2. Exploded View and Parts list
2-1. Cellular phone Exploded View ..................................................................................2-1
2-2. Cellular phone Parts list ............................................................................................2-2
2-3. Disassembly ...............................................................................................................2-9
2-4. Assembly ..................................................................................................................2-11
3. Chart of Troubleshooting
3-1. Baseband ............................................................................................................3-1
3-1-1. Power ON .....................................................................................................3-1
3-1-2. System Initial ................................................................................................3-5
3-1-3. SIM Part .......................................................................................................3-8
3-1-4. Charging Part .............................................................................................3-10
3-1-5. Microphone Part .........................................................................................3-12
3-1-6. Speaker Part ..............................................................................................3-15
3-1-7. Camera Part ..............................................................................................3-18
3-1-8. LCD .............................................................................................................3-21
3-2. RF ......................................................................................................................3-13
3-2-1. EGSM Rx ...................................................................................................3-23
3-2-2. DCS Rx ......................................................................................................3-24
3-2-3. PCS Rx ......................................................................................................3-25
3-2-4. EGSM Tx ...................................................................................................3-27
3-2-4. DCS & PCS Tx .........................................................................................3-28
3-2-6. BLUETOOTH ..............................................................................................3-30
Contents
4. Array course control
4-1. Downloading Binary Files ......................................................................................4-2
4-2. Pre-requsite for Downloading ................................................................................4-2
4-3. S/W Downloader Program .....................................................................................4-3
5. Block Diagrams
6. PCB Diagrams
7. MAIN Electrical Parts List
8. Reference data
8-1. Reference Abbreviate ..............................................................................................8-1
9. Safety Precautions
9-1. Repair Precaution ......................................................................................................9-1
9-2. ESD(Electrostaically Sensitive Devices) Precaution ................................................9-2
10. Product Function
1. Specification
1-1. GSM General Specification
EGSM 900
Phase 2
Freq. Band[MHz]
Uplink/Downlink
ARFCN range 0~124 & 975~1023 512~885
Tx/Rx spacing 45 MHz 95 MHz
Mod. Bit rate/
Bit Period
Time Slot Period/Frame
Period
Modulation 0.3 GMSK 0.3 GMSK
MSPower 33dBm~5dBm 30dBm~0dBm
880~915
925~960
270.833 kbps
3.692 us
576.9 us
4.615 ms
DCS1800
Phase 1
1710~1785
1805~1880
270.833 kbps
3.692 us
576.9 us
4.615 ms
Power Class 5pcl~19pcl 0pcl~15pcl
Sensitivity -102 dBm -100 dBm
TDMA Mux 8 8
Cell Radius 35 Km 2 Km
1-1
Speclflcation
1-2. GSM Tx Power Class
TX Power
control level
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±3 dBm
18 7±3 dBm
19 5±3 dBm
GSM900
TX Power
control level
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±4 dBm
12 6±4 dBm
13 4±4 dBm
14 2±5 dBm
DCS1800
15 0±5 dBm
1-2
2. Exploded View and Parts List
2-1. Cellular phone Exploded View
QFR01
QVO01
QKP01
QCR17
QMP01
QME01
QAN05
QBR01
QAN02
QRF03
QMI01
QCR12
QSC02
QSC01
QME03
QFU01
QMO01
QLC01
QSP01
QHI01
QFL01
QMW02
QRE01
QBA01
QCR05
QBA00
2-1
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Exploded View and Parts List
2-2. Cellular phone Parts list
Design LOC Discription SEC CODE
QAN02 INTENNA-SGH-C250 GH42-01088A
QAN05 ASSY MEC-INTENNA CONTACT GH75-08168A
QBA00 PMO-CASE BATT V2 GH72-37058B
QBA01 INNER BATTERY PACK-800MAH,MAIN GH43-02589A
QBR01 ASSY BRACKET-SHIELD GH98-03092A
QCR05 SCREW-MACHINE 6001-001478
QCR12 SCREW-MACHINE 6001-001530
QCR17 SCREW-MACHINE 6001-001460
QFU01 ASSY CASE-FOLDER UPPER GH98-03152B
QKP01 ASSY KEYPAD-(XEF/AGA) GH98-03726A
QLC01 LCD-MAIN MODULE (SGHC170) GH07-01044A
QME01 UNIT-DOME SHEET (SGHC250 F/K) GH59-03999A
QME03 UNIT-CON TO CON GH59-04016A
QMI01 MICROPHONE-ASSY GH30-00321A
QMO01 MOTOR DC-SGHZ130 GH31-00154D
QMP01 PBA MAIN-SGHC250 GH92-03287A
QMW02 PMO-COVER MAIN WINDOW GH72-36006A
QRE01 ASSY CASE-REAR GH98-03153B
QSC01 RMO-RUBBER SCREW L GH73-08668A
QSC02 RMO-RUBBER SCREW R GH73-08669A
QSP01 SPEAKER 3001-002097
QVO01 PMO-VOL KEY GH72-36007A
QFL01 ASSY CASE-FOLDER LOWER GH98-03093A
QHI01 ASSY MEC-HINGE GH75-07998A
QFR01 ASSY CASE-FRONT GH98-03094A
QRF03 PMO-COVER EAR GH72-36008A
2-2
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Exploded View and Parts List
Discription SEC CODE
BAG PE 6902-000297
ADAPTOR-SGHC140 DC JACK(EU_B GH44-01597A
UNIT-EARPHONE,10P,BLK(EU) GH59-04003A
LABEL(P)-WATER SOAK GH68-02026A
LABEL(P)-WATER SOAK GH68-02026A
LABEL(R)-MAIN(EU) GH68-13777A
MANUAL USERS-EU PORTUGUESE GH68-13787A
MANUAL USERS-EU ENGLISH GH68-13808A
BOX(P)-UNIT MAIN(EU) GH69-05022A
PMO-CASE FOLDER DUMMY GH72-36788A
MPR-VINYL BOHO WINDOW GH74-30029A
MPR-VINYL BOHO DUMMY GH74-30030A
MPR-TAPE LCD GH74-30032A
MPR-SPONGE GH74-30350A
MPR-SPONGE GH74-30350A
MPR-SPONGE GH74-30351A
MPR-TAPE KEY A GH74-30691A
MPR-TAPE KEY B GH74-30692A
MPR-TAPE LCD SOLD GH74-30693A
2-3
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Exploded View and Parts List
2-3. Disassembly
1
1) Unscrew the REAR at the
four points.
2) Uncover the EAR COVER
※
caution
1) Be careful not to make scratch and molding damage!
2
HOOK
1) Disassemble the Rear from the bottom side
to the upper side.
※
caution
1) Be careful not to make scratch and molding damage!
1) Disassemble the LCD CONNECTOR
2) Disassemble the PBA from the FRONT ASS'Y
3) Disassemble the Keypad.
※
caution
1) When PBA is separated from LCD Connector,
Be careful not to damage!
2) Be careful not to damage LCD FPCB!
43
1) Push the hinge between Folder Upper and lower,
And Disassemble Front from Folder.
※
caution
1) Be careful not to make scratch and molding damage!
2) Be careful not to damage LCD FPCB!
2-4
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Exploded View and Parts List
5
SCREW CAP POINTS
1) Remove screw caps.
2) Unscrew the FOLDER Upper.
※
caution
1) Be careful not to make scratch and molding damage!
2) Be careful not to damage LCD FPCB!
6
1) By using an assembly stick, Disassemble
Folder Upper from Folder lower
(Right and Left are the same process)
※
caution
1) Be careful not to make scratch and molding damage!
1) Disassemble the MOTOR and the SPEAKER
from FOLDER LOWER by using a pincette.
2) Melt the lead of motor and speaker's joint
※
caution
1) Be careful not to make scratch and molding damage!
87
1) Detach the insulation tape
2) Disassemble the LCD FPCB connector
3) Disassemble the LCD PANNEL from PBA
4) Melt the lead of LCD FPCB and detach the LCD
FPCB
※
caution
1) Be careful not to damage the LCD FPCB and LCD
PANNEL
2-5
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Exploded View and Parts List
2-4. Assembly
1
1)AttachthefixingtapeofLCDFPCB
2) Solder the LCD FPCB
3) Attach the insulation tape
4) Detach the cover of adhesive tape
5)AttachtheLCDPANNELtopba
※
caution
1) Arrange the lcd fpcb exactly
1) Be careful not to make scratch and molding
damage!
2) Be careful when soldering the FPCB
3) DO not overheat the FPCB
2
1) Soldering the motor and speaker
2) Assemble the LCD connector
※
caution
1) Be careful not to make scratch and molding
damage!
2) Be careful not to damage LCD FPCB!
Arrange Wires clearly on
SPEAKER and MOTOR !
1)InsertlcdintoFOLDERLOWER.
※
caution
1) When inserted FPCB, Arrange Wires clearly as
above picture is shown.
43
4
3
2
1
1) Assemble FOLDER UPPER with FOLDER
LOWER following the orders as below picture is
shown.
※
caution
1) Be careful not to make scratch and molding
damage!
2-6
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Exploded View and Parts List
5
1) Screw up the FOLDER UPPER at the above
two points.[M1.4*L2.5]
※
caution
1) Be careful not to make scratch and molding
damage!
2) Use 1.1 ± 0.2 Kgf.cm!
6
SCREW CAP
POINTS
1) Attach Screw rubber caps on the screws
by using a pincette.
※
caution
1) Be careful not to make scratch and molding
damage!
1) Insert LCD FPCB[which is connected to
FOLDER] into the bottom of FRONT Hinge.
2) The FOLDER's projection inserts the
FRONT'SholewhenProjectionispushed
3) Assemble FOLDER with FRONT
※
caution
1) Be careful not to make scratch and molding
damage!
87
1) Insert the KEYPAD.
2) Attach side volume key
2) Insert PBA into FRONT.
3) Connect LCD FPCB to PBA CONNECTOR.
※
caution
1) Be careful not to insert keypad into FRONT
incorrectly
Exploded View and Parts List
9
Rubber Attachment
Standard Line
1)AttachtheRubberfollowingRedLineas
the above picture is shown.
2) Connect LCD FPCB to PBA CONNECTOR.
3) Cover the ear cover
※
caution
1) Be careful not to make scratch and molding
damage!
10
1
2 3
1) Assemble rear with front
following the orders as below picture is shown.
11
1) Screw up the REAR at 4 Points. [M1.4*L3]
※
caution
1) Be careful not to make scratch and molding
damage!
2) Use 1.1 ± 0.2 Kgf.cm!
2-8
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Exploded View and Parts List
2-9
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
3. Flow Chart of Troubleshooting
3-1.Baseband
3-1-1. Power ON
'Power On' does not work
Check the current consumption
Yes
Current consumption
>= 100mA
Yes
Check the Vbat Voltage
Voltage >=3.3V
Yes
Check the pin of UCP101
Pin#J12 >= 2.8V
Yes
Pin#A13 and
pin#A14 =2.8V
Yes
Checktheclocksignalatpin#21ofU300
No
No
No
③
No
Download again
Charge the Battery
Check UCP101 and C116
pin#G11 =
1.8V
Yes
No
①
Check UCP101 and C117
②
Freq = 26MHz
Vpp >=400mV
Vpp≒600mV
Yes
Checktheclocksignalatpin#5,#6ofU303
Freq = 13MHz
Yes
Check the initial operation
END
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
⑤
No
No
Check the clock generation circuit
(related to OSC300)
Check U303
⑥
3-1
④
Flow Chart of Troubleshooting
③
④
⑥
⑤
②
①
DSP_DB(0:15)
DSP_AB(0:8)
DSP_IO
DSP_RWN
FLASH_RESET
XOENA
VMOD_EN
RF_EN
TX_EN
SERLE
SERDAT
SERCLK
DSP_DB(15)
DSP_DB(14)
DSP_DB(13)
DSP_DB(12)
DSP_DB(11)
DSP_DB(10)
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(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)
D2
D3
E3
E2
F3
F2
F1
F4
G4
G3
H5
J6
J5
K3
K2
K1
K5
K7
M1
M2
N2
N1
L5
P1
K6
L3
L2
R3
E6
C5
F5
E5
A4
G6
B3
A3
B1
A2
C1
C2
2
DB15
DB14
DB13
DB12
DB11
DB10
DB9
DB8
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
AB8
AB7
AB6
AB5
AB4
AB3
AB2
AB1
AB0
I|O
RWN
RESETN_CSP
NC4
OCTL1
OCTL2
NC
OCTL4
OCTL5
OCTL6
OCTL7
SERLE1
SERLE2
SERDA
SERCK
C
F
A
9
D
VCCD_2.9V
VCCA_2.9V
C100
0
1
K
1
7
5
6
1
C
C
S
N
N
D
N
G
0
3
3
0
8
9
7
1
J
J
J
J
6
4
5
3
1
1
1
1
S
S
S
S
D
D
D
D
N
N
N
N
G
G
G
G
0
7
8
9
1
6
9
7
8
1
F
G
G
G
G
H
H
H
H
4
5
6
7
8
9
2
0
1
1
1
1
S
S
S
S
S
S
S
S
S
D
D
D
D
D
D
D
D
D
N
N
N
N
N
N
N
N
N
G
G
G
G
G
G
G
G
G
1
4
1
6
4
1
8
9
F
3
S
D
N
G
6
7
1
F
P
B
D
F
A
F
C
L
2
8
1
L
L
V
V
B
S
D
N
G
B
T
S
T
C
D
D
D
D
C
D
C
N
N
D
N
D
N
O
O
V
V
G
G
_
_
G
D
D
N
D
V
G
UCP101
N
P
N
P
T
T
P
N
P
N
N
1
2
P
N
PI
F
F
I
Q
Q
E
E
X
X
X
X
R
R
T
T
T
T
P
X
X
X
A
A
X
X
R
R
T
R
R
R
R
6
7
7
6
6
7
5
E
D
D
C
B
C
B
P
PI
N
NI
C
C
F
P
Q
Q
X
X
A
A
X
X
T
T
T
T
V
R
R
C124
R
R
T
T
N
P
U
U
P
B
N
A
A
B
T
T
T
T
NI
NI
U
U
U
U
CI
CI
O
O
O
O
M
M
A
A
A
A
4
4
2
2
2
1
1
1
1
1
1
1
P
P
N
R
N
M
P
P
P
N
N
N
A
B
N
A
B
N
I
I
T
T
T
T
C
C
I
U
I
U
U
U
O
O
M
O
O
M
A
A
A
A
N
P
M
U
U
O
O
CI
CI
M
M
5
5
1
1
P
N
P
N
T
T
U
U
O
O
C
CI
I
M
M
N
K
N
NI
I
O
O
G
G
C
R
C
I
I
X
X
X
X
E
E
V
A
A
U
U
U
U
R
R
X
D
D
A
V
A
A
V
V
A
4
4
4
4
5
3
3
3
3
1
1
1
1
1
1
1
P
R
L
L
R
R
K
M
M
P
P
N
N
C123
T
T
NI
N
I
U
U
X
X
O
O
U
U
X
X
A
A
U
U
A
A
VCCD_2.9V
8
E
Q
D
N
G
P
E
E
K
_
R
W
P
9
M
0
3
1
1
C
B
7
6
D
D
V
LED2_DRV
LED1_DRV
RING_DRV
CSN_PSC
SCLK_PSC
SDO_PSC
CH_BDRV
RTC_ALMN
Q
D
R
V
T
S
NI
R
9
0
1
L
L
1
5
D
D
VDD34
V
VDD12
UP_CLK
UP_RST
UP_IO
SIM_IO
SIM_RST
SIM_CLK
VIB_DRV
VLDO_7
VLDO_6
VL5S_B
VL5S_A
VLDO_5
VL4S_B
VL4S_A
VLDO_4
VLDO_3
VLDO_2
VLDO_1
SDI_PSC
CH_ISEN
CH_RES
VBAT
C108
C11
J13
N9
R10
P10
J11
K11
K14
K12
VSIM
H11
VRTC
G12
G13
F13
F15
C12
A14
C9
D10
B10
B11
A12
B12
A13
J12
G11
F14
VACC
K8
L8
N7
M7
E14
VEXT
E13
VBAT
E11
F12
D14
D15
NC3
E10
NC9
A10
VREF
E9
CREF
H10
3
2
TR103
SIMCLK
SIMRST
SIMDATA
SIM_IO
SIM_RST
SIM_CLK
VSIM
KEY_BL1
VIB_DRV
BAND_SEL1
UP_CS
UP_SCLK
UP_SDO
UP_SDI
VREF
RTCALARM
VIB_EN
INTRQ
PWR_KEEP
RST
KEY_COL(2)
KEY_ROW(0)
VBAT
VCCA_2.9V VRF_2.9V
VCCB_2.9V
C112
C120
VRADIO_2.9V
C113 C115
C114
C109
VCCD_2.9V
C116
VCCD_1.8V
C117
VRTC_3V
C118
C101
0
1
1
5
2
4
1
6
R
P
G
K
M
N
3
4
2
D
D
S
S
S
D
D
S
S
S
N
D
V
V
V
V
G
K
Q
L
A
C
O
I
N
_
D
D
I
I
E
C
C
A
A
T
O
D
M
D
X
R
6
6
6
1
4
L
R
D
N
M
K
2
3
K
L
C
C102
5
5
1
3
6
1
1
5
1
3
4
M
J
N
F
K
B
N
J
1
1
1
2
3
2
1
2
R
S
C
D
D
D
C
O
O
U
I
I
S
S
S
D
D
D
C
_
_
V
P
P
V
V
V
H
D
D
_
_
_
D
D
D
D
D
V
V
N
N
N
G
G
G
N
F
1
2
U
O
W
W
B
_
S
S
_
2
T
R
_
_
1
E
D
T
R
R
7
S
V
W
N
I
E
C
S
S
W
W
D
P
P
R
N
R
P
3
0
7
5
9
5
4
1
1
1
L
P
P
K
N
C
C
T
C
N
N
N
O
O
M
I
_
_
_
_
R
P
GI
M
3
S
J
W
1
D
P
K
L
C
3-2
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
C300
C301
VRF_2.9V
1
HOT
GND2
4
OSC300
2
GND1
HOT
3
Flow Chart of Troubleshooting
DPCS_PAM_IN
GSM_PAM_IN
26M_OUT
AFC
VBAT
C313
C362
R304 15
L313
C306
R301 10K
C314
C318
C321
C324
C307
C326C325
SERCLK
SERDAT
SERLE
RTXIN
RTXIP
VCCD_2.9V
C323
VLDO2
6
1
VLDO1
5
1
VBAT
4
1
VDD
3
1
VCC_TXVCO
2
1
TXOP_HI
1
1
TXOP_LO
0
1
VLDO3
9
RTXQN
RTXQP
1
NI
F
E
R
U300
A
T
A
D
S
3
0
2
5
4
2
2
2
2
2
P
Q
B
Q
B
O
Q
_
B
F
_
RX1900B
E
C
R
I
B
B
_
C
C
B
V
I
I
3
4
5
C
2
V
RX1900
6
2
RX1800B
7
2
RX1800
8
2
RX900B
9
2
RX900
0
3
RX850B
1
3
RX850
2
3
E
F
GND
_
3
3
C
C
C
C
V
N
N
5
4
2
1
3
3
7
9
8
1
1
1
F
C
B
E
F
N
R
I
A
_
F
V
C
E
C
R
V
K
N
L
E
C
C
S
S
N
7
6
8
C308
DCS_LNA_IN_P
DCS_LNA_IN_N
GSM_LNA_IN_P
GSM_LNA_IN_N
26M_OUT
L309
C351
C347
C348
8
C346
R309
R311
VCC
GND
7
CK
6
D
5
_Q
4
U303
C352
1
_PR
2
_CLR
3
Q
R306
R307
3-3
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
C341
C344
CLK13M_TR
CLK13M_MC
CLK13M_YMU
Loading...