Samsung SGH-X120 Manual de usuario

SGH-X120

SERVICE

Manual

GSM TELEPHONE CONTENTS

1. Specification

2. Flow Chart of Troubleshooting

3. Exploded Views and Parts Lis

4. Electrical Parts List

5. Block Diagram

6. PCB Diagrams

GSM TELEPHONE

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1. SGH-X120 Specification

1-1

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1. GSM General Specification

GSM900

Phase 1 EGSM 900

Phase 2 DCS1800

Phase 1

Freq. Band[MHz]

Uplink/Downlink 890~915

935~960 880~915

925~960 1710~1785

1805~1880

ARFCN range 1~124 0~124 & 975~1023 512~885

Tx/Rx spacing 45MHz 45MHz 95MHz

Mod. Bit rate/

Bit Period 270.833kbps

3.692us 270.833kbps

3.692us

Time Slot Period/Frame

Period 576.9us

4.615ms 576.9us

4.615ms

Modulation 0.3GMSK 0.3GMSK 0.3GMSK

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

Power Class 5pcl ~ 19pcl 5pcl ~ 19pcl 0pcl ~ 15pcl

Sensitivity -102dBm -102dBm -100dBm

TDMA Mux 8 8 8

Cell Radius 35Km 35Km 2Km

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SGH-X120 Specification

1-2

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2. GSM TX power class

TX Power

control level DCS1800

0 30±3dBm

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 GSM900

5 33±2dBm

6 31±2dBm

7 29±2dBm

8 27±2dBm

9 25±2dBm

10 23±2dBm

11 21±2dBm

12 19±2dBm

13 17±2dBm

14 15±2dBm

15 13±2dBm

16 11±3dBm

17 9±3dBm

18 7±3dBm

19 5±3dBm

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2. SGH-X120 Flow Chart of Troubleshooting

2-1

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1. Power ON

'Power ON' Does not work

Check the current consumption

Current consumption

≥100mA ?

Check the V bat. voltage

Down load again

Voltage ≥ 3.3V ?

Check the pin of U300

pin #11 ≥ 2.8V ?

Pin #9=1.8V?

Check the Initial operation

END

pin #39 and #33 = 2.8V

Charge the Battery

Check the clock generation

circuit (OSC100, U105 pin#4)

Check the clock signal

at pin #3 of OSC100

Freq.=13MHz,Vrms 300mV

Check U300 and C312

Check U300 and C313

YES

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SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams

2-2

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2. System Initial

The pin #9 of U300 = 1.8V

and pin #11 of U300=2.8V?

Initial Failure

Is the pin #19 of U300

" Low --> High" ?

There is 32.768KHz wave

form at the C225, C226 ?

Is the pin #25 of U300

is High ?

The voltage is "High"

at the C306,C308,C309 ?

LCD Display OK ?

Sound operation OK ?

END

Check the U201

Check the U200

Check the U300

Check the LCD part

Check the Audio part

YES

Check the U300

(If it has some problem,

it has to be replaced.)

Check the U300

(If it has some problem,

it has to be replaced.)

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SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams

2-3

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3. SIM Part

Is there any signal

pin #52,53,54 of U300 ? Check the U201

"Insert SIM" is displayed on the LCD

END

Check the SIM Card

YES

Is there any signal

pin #1,2,3,6 of CN300 ? Check the U300

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SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams

2-4

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4. Charging Part

The pin #17,18 of CN301

(VEXT) is 5V ? Replace TA or check CN301

Abnormal charging operation

END

Check the U302

YES

The pin#6 OF U302 LOW?

YES

The pin#2 of U302 is Low?

YES

Check the U302

The pin#5 of U301 is

3.2~4.2V? Check the U301

The ICHRG =1V(during charging)

&180mV(fullcharging)?

YES

Solder again or change

R322

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SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams

2-5

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C310

10UF

10V

VPAC

100NF

C305

C309

10UF

10V

TA_VEXT

VBAT

VCC_1.8A

CHG_ON

VRF VRTCVBAT

Q302 1

VCCD

100PF

C315

10K,1%

C313

C301

33PF

100NF

10V

C317

10UF

390K

R309

R323

47K,1%

VCCB

POWER

U301

DRIVE 6

GND

R319

VRTC

VBAT

C307

2.2UF

VOSC

10V

C329

33PF

CN300

C306

89 GG

100NF

C303

C316

10UF

R316

VLDO_5

VLDO_6 42

VLDO_7 40

VREF

VRTC

VSIM

C304

100NF

1ISENSE

PROG 43 VCC

VSENSE

C312

2.2UF

C325

1UF

C314

2.2UF

Q301

R322

Q303

R324

3K,1%

10K,1%

C302

33PF

Q300

VCCA

D300

VL4S_A 36

VL4S_B

VL5S_A 32

VL5S_B

VLDO_1

VLDO_2

VLDO_3 39

VLDO_4

3VACC

2VBAT

VDD12 10

VDD34

VDD5

VDD67

VEXT

VIB_DRV

15 SDI

16 SDO

SIM_CLK

SIM_IO

SIM_RST

UP_CLK

52 UP_IO

54 UP_RST

PWR_KEEP

46 PWR_SW1N

PWR_SW2

RESETN

RING_DRV

55 RING_PWM

RTC_ALMN

17 SCLK

GND

GNDD

GNDD1

GNDQ

INTRQ

LED1_DRV

LED2_DRV

20 PSW1_BUF

GND

59 GND

GND

62GND

GND

64GND

65GND

EN_3

23 EN_4[0]

EN_4[1]

25 EN_5

EN_5A

27 EN_5B

57 GND

67GND

U300

44 ADC_AUX1

ADC_AUX2

45 ADC_TRIG

43 BTEMP

CREF

CSN

NEG

1POS

C326

R318

1.2K

C300

33PF

2.2UF

C308

330K

2.2UF

470NF

C311

UP_SDI

UP_SCLK

UP_CS

ICHRG

TA_VEXT

VREF

SIMDATA

SIMRST

SIMCLK

CHG_DET

PWR_ON

JIG_ON

RTCALARM

EN_VRF

EN_VPAC

XOENA

KEY_ROW(0)

KEY_COL(2)

TA_VEXT

PWR_KEEP

RST

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SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams

2-6

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5. Microphone Part

Micro-phone does not work

Is the assembled status of

Microphone O.K?

YES

Reassemble the microphone

Check the DC bias voltage on

Mic path.

The voltage of C476 is

2.2V±10%?

NO Solder the microphone again

or Replace

C434,C476,R416,R415,R440

Is microphone OK? NO Check U300

END

YES

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SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams

2-7

This Document can not be used without Samsung's authorization

6. Speaker Part

Is the terminal of speaker

is O.K?

NO Replace the speaker

There is no sound from speaker

YES

Thetypeofsoundfrom

the speaker is Melody?

YES NO

Are there any signal

at the pin #5,7 of U401?

Are there any signal

at the pin #3,9 of U401?

Check

U201,

U401

NO NO

Pin #4 of U401

is Low?

Pin #4 of U401

is High?

Check U402 Check U200

NO NO

YES YES

YES

END

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