Samsung X300 Service 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

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.

ⓒ

Samsung Electronics Co.,Ltd.

Code No.: GH68-09643A

2006. 03. Rev.1.0

1. SGH-X300 Specification

1-1. GSM General Specification

GSM900
Phase 1

Freq. Band[MHz]

Uplink/Downlink

ARFCN range 1~124

Tx/Rx spacing 45MHz 45MHz 95MHz 80MHz

Mod. Bit rate/

Bit Period

Time Slot

Period/Frame

Period

Modulation 0.3GMSK 0.3GMSK 0.3GMSK 0.3GMSK

MS Power 33dBm~13dBm 33dBm~5dBm 30dBm~0dBm 30dBm~0dBm

890~915
935~960

270.833kbps

3.692us

576.9us

4.615ms

EGSM 900

Phase 2

880~915
925~960

0~124 &

975~1023

270.833kbps

3.692us

576.9us

4.615ms

DCS1800

Phase 1

1710~1785
1805~1880

512~885 512~810

270.833kbps

3.692us

576.9us

4.615ms

PCS1900

1850~1910
1930~1990

270.833kbps

3.692us

576.9us

4.615ms

Power Class 5 p cl ~ 1 5 p cl 5pcl ~ 19pcl 0pcl ~ 15pcl 0pcl ~ 15pcl

Sensitivity -102dBm -102dBm -100dBm -100dBm

TDMA Mux 8 8 8 8

Cell Radius 35Km 35Km 2Km -

1-1

SGH-X300 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±3dBm

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±4dBm

12 6±4 dBm

13 4±4 dBm

14 2±5 dBm

DCS1800

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±4dBm

12 6±4 dBm

13 4±4 dBm

14 2±5 dBm

PCS1900

15 0±5 dBm

1-2

15 0±5 dBm

2. SGH-X300

1. Baseband

2-

2-1-1. Power ON

'Power ON' does not work

Flow Chart of Troubleshooting

check the current

consumption

>= 100mA

Yes

Check the Voltage

of the Battery

>= 3.3V

Yes

Check the pin C152,

C153,C155,C168 of

U107 is

>=2.8V

Yes

Checktheclocksignalat

pin #4 of OSC100

Freq=26Mhz,

Vrms >=300mV

No

No

No

No

Download again

Charge the battery

Check

"Power On"

key?

Check the clock generation

circuit OSC100

Yes

No

check keypad

1

check U200 and C200

2

Yes

Check the Initial Operation

Yes

END

2-1

SGH-X300 Flow Chart of Troubleshooting

VCCD VCCA

C200

C201

0
1

7

8

6

H

H

H

G

0

1

9

8

1

1

S

S

S

S

D

D

D

D

N

N

N

N

G

G

G

G

0

9

8

7

1

G

G

G

F

6

5

7

4

S

S

S

S

D

D

D

D

N

N

N

N

G

G

G

G

3
1

7

9

8

F

D

F

F

3

1

2

3

S

S

S

C

D

D

D

D

N

N

N

A
_

G

G

G

X
U
A

3

4

4

1
P

C

B

L

L

V

T

T

D

C

C

N

O

O

G

_

_

D

D

D

N

V

G

0

1
1
L

V
D
D
V

1

1

1

6

6

M

F

N

A

D

B

D

B

D

D

D

D

N

N

D

D

V

V

G

G

5

4

2

6

G

K

R

P

1

2

3

4

S

S

S

S

S

S

S

S

V

V

V

V

3

6

5

4

M

N

J

N

2

1

3
D

O

O

I

I

D

_

_

V

D

D

D

D

V

V

2

1

2-2

2-1-2. Initial

SGH-X300 Flow Chart of Troubleshoo ting

Initial Failure

check the pin

RSTB of U300 is

LOW?

Yes

check the pin CKI

of U300 is 13Mhz?

Yes

Check the clock signal
at pin #3 of OSC100

Freq=26Mhz?

Yes

Check the pin #9 of U300

is HIGH and pin #11,

#13 is 2.9V?

No

No

No

No

Check U300

Check

R103,R107,R200,C130

check OSC100

Check U200

1

2

3

4

Yes

Check the Initial Operation

Yes

END

2-3

SGH-X300 Flow Chart of Troubleshooting

R103

13MHZ_BB CLK13M_TR

R104

C130

R106

R107

C131

CLK13M_MC

CLK13M_YMU

VCC_1.8A

C306 C307 C308

VCC_1.8A

6

6

7

3

5

1

1

1

1

A

C

R

T

R

S

D

D

D

D

S

D

D

D

D

V

V

V

V

V

VCCD

5

6

6

4

7

1

4

1

G

R

R

D

D

D

D

D

D

V

V

V

6

1

1

1

1

1

1

2

E

E

B

E

E

E

D

D

D

D

D

D

V

D

D

V

V

V

2

8

U

U

N

U

P

E

E

E

E

E

D

D

D

D

D

D

D

D

D

D

V

V

V

V

V

6

5

0

1
M

E
D
D
V

0

1

1

1

1

1
F

E

E

G

B

L

L

F

E

E

L

L

E

D

D

P

P

R

D

D

D

D

V

V

V

_

_

X

S

D

S

D

V

V

VCCD

1

1
C

A
S
S
V

A
D
D
V

C305

8
D

VRTC

2

7

1

1
F

C

I

C

B

K

T

T

C

S

R
V

R

F12

TDO

F15

DSP_TDO

VREF
CLK13M_TR
TR_RST

3

2

4

1

2-4

2-1-3. Sim Part

"Insert SIM" is displayed on the LCD

SGH-X300 Flow Chart of Troubleshoo ting

The voltage is 2.8V

at the pin#1 of CN200

Yes

Is there any signal

pin #2,3,4 of CN200?

Yes

Check the SIM Card

END

VBAT

No

No

Check the U200

Check the U200 & U300

1

2

3
1
B

7
6
D
D
V

0
1
C

5
D

VDD34

D
V

VDD12

UP_CLK
UP_RST

UP_IO

SIM_IO
SIM_RST
SIM_CLK

C11
J13

N9
R10
P10
J11
K11
K14

C203

SIMCLK
SIMRST
SIMDATA

C204

2-5

6
5
4

CN200

6
5
4

7GG89GG10

11

22

33

C205

C206

C207

C208

SGH-X300 Flow Chart of Troubleshooting

2-6

2-1-4.Microphone Part

* Call with Sim before testing.

MicroPhone does not work

SGH-X300 Flow Chart of Troubleshoo ting

Yes

Check the soldered

status of microphone

Yes

Check the reference

voltage on mic path

R414≒2.0V

Yes

Is microphone OK?

Yes

END

No

No

No

Resolder microphone

Resolder or change

Check U200

1

2

2-7

SGH-X300 Flow Chart of Troubleshooting

MICOUTP

MICINP

MICINN

R401

R408

R402

R406

C400

C404

C412

C408

VCCA

R404

R412

C411

C402

C407

R409

R414

L400

L401

C403

R410

R415

R413

C405

C409

C401

C406

V410

V411

MIC+

MIC+

MIC1

MICMICOUTN

1

2

2-8

2-1-5. Speaker Part

There is no sound from speaker

SGH-X300 Flow Chart of Troubleshoo ting

Check the connection

status of LCD connector

CN800

Yes

Are there any signal at

the speaker pad on LCD

PCB?

No

Check R403, R405 of

U400. Voltage is≥1V?

Yes

END

No

Yes

No

1

reconnect CN800

Replace the speaker module

2

Check U600

2-9

SGH-X300 Flow Chart of Troubleshooting

1

2

2-10