Samsung SGH-E720 Bedienungsanleitung

GSM TELEPHONE

SGH-E720

GSM TELEPHONE CONTENTS

1. Specification

2. Flow Chart of Troubleshooting

3. Exploded Views and Parts List

4. Electrical Parts List

5. PCB Diagrams

6. Block Diagrams

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1. SGH-E720 Specification

1-1

This Document can not be used without Samsung's authorization

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 -

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SGH-E720 Specification

1-2

This Document can not be used without Samsung's authorization

1-2. GSM TX power class

TX Power

control level GSM900

533±2dBm

631±2dBm

729±2dBm

827±2dBm

925±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

TX Power

control level DCS1800

030±3dBm

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

TX Power

control level PCS1900

030±3dBm

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

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2. SGH-E720 Flow Chart of Troubleshooting

2-1

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2-1.Baseband

2-1-1. 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 pins of U401

C415 ≥1.8V ?

Check the Initial operation

END

C418 and C419 = 2.8V?

Charge the Battery

Checktheclockgeneration

circuit (OSC101, F100 pin#4)

Checktheclocksignal

at pin #3 of OSC101

Freq.=13MHz,Vrms ≥300mV

Check U401 and C420

Check U401 and C415

YES

C420=1.5V?

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SGH-E720 Flow Chart of Troubleshooting

2-2

This Document can not be used without Samsung's authorization

BOARD_HOLE

G2G3

JTAG

TRIDENTHP

G1G4

RST

DSP_TDO

DSP_TDI

DSP_TMS

DSP_TCK

DSP_RWN

VBAT

JIG_ON

SDS_RXD

SDS_TXD

ANT

USB_5V

USB_D+

USB_D-

SPK1P

SPK1N

MIC+

MOT

MIC-

C205

R207

V201

CN506

1515

VCCD

Q200

2929

3131

ANT

D+9

D-

F-WE

GND7

GND

25HP/POWER

MIC+13

MOT+

RXD

SPK+11

SPK-

21TCK

C207

19TDI

TDO

TMS

17TRST

27TXD

C217

23V_BATT

C211

V_BUS

C221

VCCD_1_8

C220

F200

VCCD

U204

GND

VCC

C223

C222

OSC201

VCCD_1_5

C206

100K

R241

VCCD_1_8

R243

R209

R208

C202

R242

C208

C201

C204

C216

VRTC

H11

VSS8

H12

VSS9

R11

VSSA_D

VSSA_U F18

X1RTC

H19

X2RTC

F19

VSS14

VSS15

VSS16 M10

VSS17 M11

M12

VSS18

VSS2 A18

VSS3 G8

VSS4 G9

VSS5 H8

VSS6

H10

VSS7

C14

VDD_IO_1P8_6

VDD_IO_1P8_7

D18

VDD_IO_1P8_8

VDD_IO_1P8_9 F1

VRTC G18

VSS1

J12

VSS10

VSS11 K8

VSS12

VSS13 L8

VDD_IO_1P8_12

T18

VDD_IO_1P8_13

VDD_IO_1P8_14 U1

VDD_IO_1P8_15 U5

U12

VDD_IO_1P8_16

VDD_IO_1P8_17

W18

VDD_IO_1P8_18

VDD_IO_1P8_2 B6

VDD_IO_1P8_3 B12

B16

VDD_IO_1P8_4

VDD_IO_1P8_5

VDD_CORE2 B13

VDD_CORE3

H18

VDD_CORE4

VDD_CORE5 M2

VDD_CORE6 N18

VDD_CORE7 V7

VDD_CORE8 V13

VDD_IO_1P8_1 B4

VDD_IO_1P8_10

L16

VDD_IO_1P8_11

V14

TDOT12

TEST1U15

T14

TEST2

TEST3V16

W14

TMS

TRSTN R12

TX0

K7 TX1

T11

VDDA_D

F17

VDDA_U

VDD_CORE1

T2 SIMIO

SPCLK0

M18

SPCLK1_PIO18

T3 SPFS0

N15

SPFS1_PIO15

R4 SPRXD0

SPRXD1_PIO17M17

U2 SPTXD0_I2SD

N16

SPTXD1_I2SD_PIO16

TCKU14

TDI

PIO43_MCI_DAT0_EN

J16

PIO47

PWM1_PIO46

RESTN G15

RIO_PIO01

RTCALARMN

H17

N2 RTS0_PIO04

RWNV6

M1 RX0_IRQ28

L6 RX1_IRQ28

SIMCLK

R13

U18

PIO33

PIO34R14

PIO35_A_A25_BOOTSEL

F16 PIO36_USB_OEN

E17 PIO37_USB_DATA

PIO38_MCI_CLK

J15

L14 PIO39_MCI_CMD_EN

PIO40_MCI_DAT_EN

M14

R16 PIO41_IRDATX

PIO42_IRDARX

R17

N14

K13 PIO21_MCI_DAT0

PIO22_MCI_DAT1

L12

L13 PIO23_MCI_DAT2

L15 PIO24_MCI_DAT3

V19 PIO25

U16 PIO26

PIO27

U19

PIO28

W17

E14PIO30_WAITN

P12

PIO31_IRQ6

PIO32

P16

PIO07_USB_SUSP

B19

PIO08_MCI_CMD

J13

C19 PIO09_USB_VPI

PIO10

V17

PIO11_USB_VMI

C18

D17 PIO12_USB_VPO

E16 PIO13_USB_VMO

P5 PIO14_SIMRST

P15 PIO19_PWRKEEP

PIO20_SYSCLKREQ

P19

KEYBRD3

J8 KEYBRD4

KEYBRD5

H4 KEYBRD6

KEYBRD7

KEYBRD8

G6 KEYBRD9

NC1

NC2

G16 OSC32OUT

PIO00_IRQ5

IOBIT0_PIO05V12

N11

IOBIT1_PIO06

IRQ1M16

M19

IRQ2

IRQ3P17

IRQ4P18

J7 KEYBRD0

KEYBRD1

KEYBRD10

KEYBRD11_PSW1_BUF

KEYBRD2

D_D2

D_D3T7

D_D4

D_D5

D_D6

D_D7T8

D_D8

D_D9R9

FLASHRSTN

H14

T15

INT0

IOW6

D_A6

D_A7

D_A8

D_D0U6

D_D1T6

D_D10

D_D11

D_D12

D_D13

D_D14N10

D_D15P11

M6 CTS0_PIO29

N5 DCD0_PIO44

P2 DSR0_PIO02

DTR0_PIO03

D_A0

D_A1

D_A2

D_A3

D_A4U4

D_A5T5

A_D4

F11A_D5

E11A_D6

A_D7

G12

A_D8

D11

A_D9

E12

A_OEN

B14

D14A_WEN

W12

CKI

N12

CKO_IACK

T17

CPTSTSTOP_CKO

B17

A8A_D0

A_D1

C12A_D10

A_D11

A12

F12A_D12

D12A_D13

E13A_D14

D13A_D15

A_D2

A_D3

G10

G11

A_A9

H16A_BE0N

A_BE1N

A17

A14A_CS0N

C15A_CS1N

A_CS2N

G14

A_CS3N

J14

A_CS4N

D15

C16A_CS5N

F15A_CS6N

A_CS7N

A_A20

A_A21

A_A22

A_A23

A_A24

A_A3

C6A_A4

A_A5

D7A_A6

A_A7

C4A_A8

A_A10

A_A11

B1A_A12

D6A_A13

D5A_A14

A_A15

A_A16

A_A17

A_A18

D2A_A19

A_A2

U201

ATCK_CTS1M4

ATDI_RTS1

T13

ATDO_PWM2

K12

ATMS_PIO45

A_A0

A_A1

VCCD

C210

C209

C203

VCCD_1_8

GND

OUT

VCC

U203

RST

USB_VPI

USB_SUSP

CLK32K

KEY_ROW(3)

KEY_ROW(2)

KEY_ROW(1)

KEY_ROW(0)

PSW1_BUF

KEY_ROW(4)

KEY_COL(0)

DEBUG_CTS

CLK13M_TR

CP_WEN

D(15)

CP_TDO

RAM1_CS

SIMDATA

SIMCLK

SDS_RXD

DEBUG_RXD

DEBUG_RTS

RTCALARM

USB_DATA

USB_OEN

EAR_SWITCH

HALL_SENSOR

XOENAQ

PWR_KEEP

SIMRST

USB_VMO

USB_VPO

USB_VMI

A(5)

A(6)

A(7)

A(8)

A(9)

A(10)

A(11)

A(12)

A(13)

A(14)

A(15)

A(16)

A(17)

A(18)

A(19)

A(20)

A(21)

A(22)

A(23)

A(24)

A(1:24)

SDS_TXD

DEBUG_TXD

DSP_TMS

DSP_TDO

UP_SCLK

D(3)

D(4)

D(5)

D(6)

D(7)

D(8)

D(9)

D(10)

D(11)

D(12)

D(13)

D(14)

D(0:15)

UPPER_BYTE

ONENAND_CS

ROM1_CS

FLASH_RESET

CP_OEN

A(0)

A(1)

A(2)

A(3)

A(4)

DSP_DB(8)

DSP_DB(9)

DSP_DB(10)

DSP_DB(11)

DSP_DB(12)

DSP_DB(13)

DSP_DB(14)

DSP_DB(0:15)

DSP_DB(15)

KEY_COL(4)

KEY_COL(3)

KEY_COL(2)

KEY_COL(1)

UP_CS

D(0)

D(1)

D(2)

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_AB(0:8)

DSP_DB(0)

DSP_DB(1)

DSP_DB(2)

DSP_DB(3)

DSP_DB(4)

DSP_DB(5)

DSP_DB(6)

DSP_DB(7)

LCDC_CS

YMU_CS

LOWER_BYTE

KEY_COL(0:4)

DSP_RWN

DSP_IO

DSP_INT

USB_CON

INTRQ

JACK_INT

YMU_IRQ

LCDC_INT

CP_TMS

CP_TCK

CP_TDI

DSP_AB(0)

PCM_IN

PCM_SYNC

HALL_SENSOR

DSP_TCK

DSP_TDI

OLED_BACK_EN

FLASH_EN1

AUDIO_OUT_SEL

UP_SDI

UP_SDO

M_HOLD

EAR_OUT_SEL

VBT_EN

KEY_ROW(0:5)

DLC_DETECT

BT_SLEEP

DIM_EN

VCAM_EN

JIG_ON

BP_VF

AMP_SHDN

BRIGHTNESS

P_MODE

USB_DET

NAND_INT

PCM_CLK

PCM_OUT

KEY_ROW(5)

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SGH-E720 Flow Chart of Troubleshooting

2-3

This Document can not be used without Samsung's authorization

2-1-2. Initial

The voltage at the C415=1.8V?

The voltage at the C419=2.8V?

Initial Failure

ThevoltageattheZD405

" Low --> High" ?

There is 32.768KHz wave

form at the C216, C217 ?

The voltage on R412 is

"Low --> High" ?

The voltage is 2.8V

at the C416,C418,C419 ?

LCD Display OK ?

Sound operation OK ?

END

Check the U201

Check the U401

Check the LCD part

Check the Audio part

YES

Check the U401

(If it has some problem,

it has to be replaced.)

Check the U401

(If it has some problem,

it has to be replaced.)

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SGH-E720 Flow Chart of Troubleshooting

2-4

This Document can not be used without Samsung's authorization

VCCB

VCCD_1_5

C421

C426

TH101

VCCD

EAR_CHECK

RST

PCS_RX_EN

AUXOUTN

RTXIN

SERDAT

FLASH_RESET

VCCA

C418

C403

C402

VCCD_1_8

VBAT

R413

C409

C428

VCCD

R407

ZD405

M400

NEG POS

VRF

VBAT

C408

VSS3 R2

VSS4

VXVCM

R13

XOENAQ

C405

VCCA

VCCB

VRF

C458

DSP_DB(0:15)

DSP_AB(0:8)

SIM_RST

BP_VF

SIM_CLK

MICOUTP

MICOUTN

MICINP

MICINN

DSP_DB(0)

KEY_BL2

KEY_BL1

DSP_IO

INTRQ

DSP_INT

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)

C400

R412

C417

VRTC

C419

VCCB

C414

VCCD_1_8

R414

PSW1_BUF

C401

C416

C404

VBAT

UP_CS

AUXOUTP

AUXINP

AUXINN

AOUTBP

AOUTBN

AOUTAP

AOUTAN

AFC

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)

B12

VLDO_5B10

VLDO_6A14

VLDO_7C12

VREFA10

VREGN

R14 VREGP

M13

VRTCH11

VSIMK12

VSS1 G5

VSS2 K4

VEXTE14

VIB_DRVF15

VIB_RNG_EN

VL4S_AA12

VL4S_BB11

VL5S_AD10

VL5S_B

VLDO_1G11

VLDO_2J12

VLDO_3A13

VLDO_4

VDD2 M3

VDD3 N6

C11

VDD34

VDD5 C10

VDD67 B13

VDDB A6

VDDD N11

VDDV L11

VDD_IO1 N5

VDD_IO2 J4

VDD_OCTL C4

K14

SIM_IOJ11

SIM_RSTK11

TXP

UP_CLKN9

UP_IOP10

UP_RSTR10

VACCF14

VBATE13

VDD1 J3

VDD12J13

D6 RXTXIP

RXTXQN

C6 RXTXQP

SCLK_PSCL8

SDI_PSC

SDO_PSCN7

SERCK

C1SERDA

B1SERLE1

SERLE2

SIM_CLK

PWR_SW1N

C15 PWR_SW2

C14

RAREF1

B6 RAREF2

R3RESETN_CSP

RESET_O

RING_DRVF13

RTC_ALMN

H10

RTC_CLK

RWN

RXTXIN

OCTL0

C5OCTL1

OCTL2

E5OCTL3

OCTL4

G6OCTL5

OCTL6

A3OCTL7

PSW1_BUF

PWR_KEEP

I|O

LED1_DRVG13

LED2_DRVG12

MICINN

M14 MICINP

N14

MICOUTN

P15 MICOUTP

N15

MODE

N10

NC5

NC6 2

NC7

GNDS6 G8

GNDS7 G9

GNDS8 G10

GNDS9 H6

GNDV P13

GND_HCUR F11

GND_OCTL B4

GND_PSC1 B15

GND_PSC2 K15

INTRQ

L10

GNDS11 H8

GNDS12

GNDS13 J7

GNDS14 J8

GNDS15 J9

GNDS16 J10

GNDS17 K10

GNDS2 F8

GNDS3 F9

GNDS4 F10

GNDS5 G7

H5DB6

G3DB7

G4DB8

F4DB9

DINTR

GNDB F6

M10

GNDD

GNDQ E8

GNDS1 F7

GNDS10 H7

K2DB1

DB10

F2DB11

F3DB12

E2DB13

E3DB14

D2DB15

DB2

J5DB3

DB4

DB5

D13

CH_BDRVE11

CH_ISENF12

CH_RESD14

CREF

CSN_PSC

DAICK

DAIDI

DAIDO

DAIRN

DB0

E10

ADC_AUX2D15

AFC

AOUTAN

N12 AOUTAP

P11

AOUTBN

P12 AOUTBP

R12

AUXINN

L14 AUXINP

M15

AUXOUTN

L13 AUXOUTP

K13 AUX_ADC3

U401

AB0

P1AB1

AB2

N1AB3

AB4

M2AB5

AB6

K7AB7

AB8

ADC_AUX1

C456

C407

R405

CN401

C406

R406

C420

C427

C415

C457

SIMCLK

VAPC

SIM_RST

SIM_IO

SIM_CLK

SERLE

SERCLK

UP_SDO

UP_SDI

UP_SCLK

RTXQP

RTXQN

RTXIP

DSP_RWN

CLK32K

RTCALARM

JIG_ON

PWR_ON

PWR_KEEP

PAC_EN

RF_EN

TX_BAND_SEL

VSIM

SIM_IO

XOENAQ

VSIM

DCS_TX_EN

GSM_TX_EN

VIB_EN

MOT

SIMRST

SIMDATA

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SGH-E720 Flow Chart of Troubleshooting

2-5

This Document can not be used without Samsung's authorization

2-1-3. Sim Part

The voltage is 2.8V

at the pin #1 of CN401? Check the U401

"Insert SIM" is displayed on the LCD

END

Check the SIM Card

YES

Is there any signal

pin #2,3,4 of CN401 ? Check the U401 & U201

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SGH-E720 Flow Chart of Troubleshooting

2-6

This Document can not be used without Samsung's authorization

2-1-4. 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 C437 is

about 2.2V±10%?

NO Solder the microphone again

or Replace

C437,C438,R428,R430,R433

Is microphone OK? NO Check U401

END

YES

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SGH-E720 Flow Chart of Troubleshooting

2-7

This Document can not be used without Samsung's authorization

MSPK+

MSPK-

R422

ZD402

R424

R404

R455

C445

AOUTBP

MELODY+

SPK1N

AUDIO_OUT_SEL

AOUTBN

AOUTAP

AOUTAN

VREF

VSS

/CS

/IRQ

/RD

/RST

/WR

R401

C465

R430

C463

C413

C440

MICOUTP

MICINP

MICOUTN

MICINN

C435

R433

200

VCCD_1_8

C422

C423

C450

VCCA

V404

ZD406

C447

L402

R428

R457

C466

R402

C451

V400

CP_OEN

A(0)

YMU_CS

VIB_EN

HPOUT-L

HPOUT-R

CP_WEN

LOUT

SPK1P

EAR_R

EAR_L

MIC+

EAR_R

EAR_L

MIC-

HPOUT-R

HPOUT-L

ROUT

EAR_CHECK

EAR_SWITCH

MELODY-

EAR_OUT_SEL

C433

C453

GND

22NC

V+

VBAT

C441

C436

VCCD

R423

C452

C446

VCCD_1_8

3.3V_SW_AK

C462

R464

1314

G15

G18

R429

C411

C437

R471

R436

V401

C449

C425

C448

MIC400

3.3V_SW_AK

U403

CN400

1010

R458

C444

C430

R453

C467

3S2

4S1

4S2

4D2

D412

GND

21-2IN

1S1

11S2

2S1

2S2

3-4IN10

3S1

C4741UF

C434

C472

MTR

PLLC

SPOUT1

SPOUT2

SPVDD

SPVSS

VDD

3435

HPOUT-L/MONO

HPOUT-R

IOVDD

LED

2423

2221

EQ1

EQ2

EQ3

U402

CLKI

C438

C439

C412

C432

C461

C464

L401

R403

R473

1UF

C475

R421

R410

R472

C424

C468

C469

V403

C410

R434

F400

R454

JACK_INT

AUXINP

AUXOUTP

AUXINN

AUXOUTN

CLK13M_YMU

D(2)

YMU_IRQ

RST

D(5)

D(6)

D(7)

D(4)

D(3)

D(1)

D(0)

Andere Handbücher für SGH-E720

Inhaltsverzeichnis

Andere Samsung Handy Handbücher

Samsung

Samsung Sway Bedienungsanleitung

Samsung

Samsung GT-S3830U Bedienungsanleitung

Samsung

Samsung GT-S6812B Bedienungsanleitung

Samsung

Samsung GTE3210O Bedienungsanleitung

Samsung

Samsung GH68-07973A Bedienungsanleitung

Samsung

Samsung SM-G970N Bedienungsanleitung

Samsung

Samsung GT-S5050 Bedienungsanleitung

Samsung

Samsung SGH-T746 Bedienungsanleitung

Samsung

Samsung E1125 Bedienungsanleitung

Samsung

Samsung GALAXY J7 V Bedienungsanleitung

Samsung

Samsung SGH-T249 Bedienungsanleitung

Samsung

Samsung Galaxy S4 Bedienungsanleitung

Samsung

Samsung SM-N930X Bedienungsanleitung

Samsung

Samsung SGH-A500 Bedienungsanleitung

Samsung

Samsung SM-T817P Bedienungsanleitung

Samsung

Samsung SM-G5510 Bedienungsanleitung

Samsung

Samsung SM-E700H/DS Bedienungsanleitung

Samsung

Samsung Attain SCH-R920 Bedienungsanleitung

Samsung

Samsung SGH-T159 Series Bedienungsanleitung

Samsung

Samsung Galaxy J2 Pure Bedienungsanleitung

Samsung

Samsung SGH-Z110V Bedienungsanleitung

Samsung

Samsung Galaxy S III Bedienungsanleitung

Samsung

Samsung SM-N981W Bedienungsanleitung

Samsung

Samsung SGH-A500 Bedienungsanleitung

Beliebte Handy Handbücher anderer Marken

Zte

Zte BLADE A520 Bedienungsanleitung

Nokia

Nokia Lumia 620 Bedienungsanleitung

Blackbe;rry

Blackbe;rry KEYone Bedienungsanleitung

Bea-fon

Bea-fon X5 Premium Bedienungsanleitung

Blackbe;rry

Blackbe;rry 8707 Series Bedienungsanleitung

Blackbe;rry

Blackbe;rry Storm Betriebsanleitung

LG LM-X420QN Bedienungsanleitung

LifeWatch

LifeWatch V Bedienungsanleitung

Bea-fon

Bea-fon SILVER LINE SL860 Bedienungsanleitung

IKI Mobile

IKI Mobile KF4.5i Bedienungsanleitung

Hitech

Hitech HT-850 Bedienungsanleitung

Yezz

Yezz Fashion F10 Bedienungsanleitung

Point Mobile

Point Mobile PM60 Bedienungsanleitung

Blackbe;rry

Blackbe;rry Q10 Bedienungsanleitung

Blackbe;rry

Blackbe;rry Bold 9900 Bedienungsanleitung

Blackbe;rry

Blackbe;rry STORM 9500 - VERSION 5.0 Bedienungsanleitung

LG LM-K420EMW Bedienungsanleitung

ISAFE MOBILE

ISAFE MOBILE IS655.2 Bedienungsanleitung