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
No
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
pin#G11 =
1.5V
No
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
No
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
No
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
No
No
Yes
Yes
Yes
Check the LCD part
No
Sound is O.K
Yes
No
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
No
Yes
Yes
Yes
Yes
No
No
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
No
Yes
Yes
Yes
Yes
No
Is microphone ok?
No
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 ?
No
Replace the Speaker
Yes
Are there any signals at
the C502,C503
No
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
No
No
No
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
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 ?
NO
YES
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES