Samsung SGH-S342i User manual

GSM TELEPHONE

SGH-S342i

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-S342i Specification

1-1

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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-S342i Specification

1-2

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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-S342i Flow Chart of Troubleshooting

2-1

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1.Baseband

1. Power ON

'Power On' does not work

Voltage >=3.3V

Download again

Charge the Battery

Pin#J12 >= 2.8V Check U100 and C111

Check U100 and U114

Freq = 13MHz

Vrms >=300mV

Vpp≒900mV

Check the clock generation circuit

(related to OSC700)

Check the initial operation

END

Yes

pin#G11 =

1.5V

Yes

Check the current consumption

Check the Vbat Voltage

Check the pin of U100

Checktheclocksignalatpin#27ofU700

Current consumption

>= 100mA

Pin#A13 and

pin#A14 =2.8V

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SGH-S342i Flow Chart of Troubleshooting

2-2

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2. Initial

Initial Failure

The pin #G11 of U100 =

1.5V and

the pin #J12 of U100 =

2.825V ?

Check the U100

(if it has some problem, it is to be replaced.)

Yes

Is the pin #K9 of U100

"Low →High" ?

Yes

No Check the U100

(if it has some problem, it is to be replaced.)

There is 32.768kHz wave

forms at the C214 and

C215

Yes

Check the U200

Is the pin #A4 of U100

is "High"

The voltage is "High" at

the C113,C110,C119 Check the U100

Check the U700

LCD display is O.K

Yes

Check the LCD part

Sound is O.K

Yes

Check the Audio part

END

Yes

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SGH-S342i Flow Chart of Troubleshooting

2-3

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3. Sim Part

Check the voltage at

pin#1 of CN100 >=

2.8V ?

"Insert SIM is displayed on the LCD

Check the SIM

connector's (CN100)

connection to SIM card

Check the U100

Resolder or change CN100

END

Yes

Is there any signals

pin#2,#3,#4 of CN100 ? Check the U200

Check the SIM Card

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SGH-S342i Flow Chart of Troubleshooting

2-4

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4. Microphone Part

Is the assembled status

of microphone O.K?

Microphone does not work

Reassembled the microphone

Resolder or change

R406,C416,R407,C405,R410,C413,

R421,C421,R420,R425,C427,C422

END

Yes

Is microphone ok?

Check U700

Check the reference voltage on mic path

C406 ≒2.0V ?

Yes

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SGH-S342i Flow Chart of Troubleshooting

2-5

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5. Speaker Part

There is no sound from the Speaker

Is the terminal of Speaker

O.K ?

Replace the Speaker

Yes

Are there any signals at

the C502,C503

Yes

Check LCD or Replace CN500

Thetypeofsound

from the Speaker is

Melody

Is there any signals

at the pin#5 and

pin#7 of U400 ?

Is there any signals

at the pin#2 and

pin#10 of U400 ?

Yes No

The pin#4 of

U400 is "Low"

The pin#4 of

U400 is "High"

Check the

U401

Check the

U401

Yes Yes

NoNo

Check the U200

Check the U400

Yes Yes

No No

END

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SGH-S342i Flow Chart of Troubleshooting

2-6

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6. Camera Part

"Camera" function dose not work

Yes

Check the connect

CN500

Yes

U302 PIN 5 = 2.8V?

Yes

R402 < 25MHz

Connect the camera module

Check U202 and C210

C308, U301

END

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SGH-S342i Flow Chart of Troubleshooting

2-7

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F700 CHECK

pin13 ≥-65dBm ?

2.RF

1. EGSM RX

CONTINUOUS RX ON

RF INPUT : 62CH

AMP : -50dBm

NORMAL CONDITION

catch the channel?

CHECK

ANT700,R708 contact ?

U700

pin 9,31: 2.8V ?

F700 CHECK

pin1,2 ≥-65dBm ?

U700 CHECK

pin20,21 ≥-65dBm ?

C732,CN700

resolder or change

F700

resolder or change

U100 pinA13, C119

change or resolder

U700 CHECK

pin 8 : 13MHz ?

Vp-p : 950mV?

OSC700

change or resolder

U700

resolder or change

U100 CHECK!!

U700

pin1,2,3,28 Vp-p

: 120mV ?

YES

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