Samsung SGH-S342i Service 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
1. SGH-S342i Specification
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 5pcl ~ 15pcl 5pcl ~ 19pcl 0pcl ~ 15pcl 0pcl ~ 15pcl
Sensitivity -102dBm -102dBm -100dBm -100dBm
TDMA Mux 8 8 8 8
Cell Radius 35Km 35Km 2Km -
1-1
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SGH-S342i Specification
2. GSM TX power class
TX Power
control level
5 33±2dBm
6 31±2dBm
7 29±2dBm
8 27±2dBm
9 25±2dBm
10 23±2dBm
11 21±2dBm
GSM900
TX Power
control level
0 30±3dBm
1 28±3dBm
2 26±3dBm
3 24±3dBm
4 22±3dBm
5 20±3dBm
6 18±3dBm
DCS1800
TX Power
control level
0 30±3dBm
1 28±3dBm
2 26±3dBm
3 24±3dBm
4 22±3dBm
5 20±3dBm
6 18±3dBm
PCS1900
12 19±2dBm
13 17±2dBm
14 15±2dBm
15 13±2dBm
16 11±3dBm
17 9±3dBm
18 7±3dBm
19 5±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
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
1-2
15 0±5dBm
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2. SGH-S342i Flow Chart of Troubleshooting
1.Baseband
1. Power ON
'Power On' does not work
Check the current consumption
Yes
Current consumption
>= 100mA
Yes
Check the Vbat Voltage
Voltage >=3.3V
Yes
Check the pin of U100
Pin#J12 >= 2.8V
Yes
Pin#A13 and
pin#A14 =2.8V
Yes
No
No
No
No
Yes
Download again
Charge the Battery
Check U100 and C111
pin#G11 =
1.5V
No
Check U100 and U114
Checktheclocksignalatpin#27ofU700
Freq = 13MHz
Vrms >=300mV
Vpp≒900mV
Yes
Check the initial operation
END
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No
Check the clock generation circuit
(related to OSC700)
2-1
SGH-S342i Flow Chart of Troubleshooting
2. Initial
Initial Failure
Yes
The pin #G11 of U100 =
1.5V and
the pin #J12 of U100 =
2.825V ?
Yes
No
(if it has some problem, it is to be replaced.)
Check the U100
Is the pin #K9 of U100
"Low→High" ?
Yes
There is 32.768kHz wave
forms at the C214 and
C215
Yes
Is the pin #A4 of U100
is "High"
Yes
The voltage is "High" at
the C113,C110,C119
Yes
No
No
No
No
(if it has some problem, it is to be replaced.)
Check the U100
Check the U200
Check the U700
Check the U100
No
LCD display is O.K
Yes
No
Sound is O.K
Yes
END
Check the LCD part
Check the Audio part
2-2
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3. Sim P art
SGH-S342i Flow Chart of Troubleshooting
"Insert SIM is displayed on the LCD
Yes
Check the SIM
connector's (CN100)
connection to SIM card
Yes
Check the voltage at
pin#1 of CN100 >=
2.8V ?
Yes
Is there any signals
pin#2,#3,#4 of CN100 ?
Yes
Check the SIM Card
END
No
No
No
Resolder or change CN100
Check the U100
Check the U200
2-3
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SGH-S342i Flow Chart of Troubleshooting
4. Microphone Part
Microphone does not work
Yes
Is the assembled status
of microphone O.K?
Yes
Check the reference voltage on mic path
Yes
C406≒2.0V ?
Yes
Is microphone ok?
Yes
END
No
No
No
Reassembled the microphone
Resolder or change
R406,C416,R407,C405,R410,C413,
R421,C421,R420,R425,C427,C422
Check U700
2-4
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5. Speaker Part
There is no sound from the Speaker
SGH-S342i Flow Chart of Troubleshooting
Check the
U401
Is the terminal of Speaker
Are there any signals at
O.K ?
Yes
the C502,C503
Yes
Is there any signals
at the pin#5 and
pin#7 of U400 ?
Yes
The pin#4 of
U400 is "Low"
No
No
Yes
Thetypeofsound
from the Speaker is
Melody
No No
Replace the Speaker
Check LCD or Replace CN500
No
Is there any signals
at the pin#2 and
pin#10 of U400 ?
Yes
The pin#4 of
U400 is "High"
NoNo
Check the
U401
Yes
Check the U200
Check the U400
END
Yes
2-5
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SGH-S342i Flow Chart of Troubleshooting
6. Camera Part
"Camera" function dose not work
Yes
Check the connect
CN500
Yes
U302 PIN 5 = 2.8V?
Yes
R402 < 25MHz
END
No
No
No
Connect the camera module
Check U202 and C210
C308, U301
2-6
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SGH-S342i Flow Chart of Troubleshooting
2.RF
1. EGSM RX
NORMAL CONDITION
catch the channel?
YES
F700 CHECK
pin13≥-65dBm ?
YES
F700 CHECK
pin1,2≥-65dBm ?
YES
U700 CHECK
pin20,21≥-65dBm ?
NO
NO
NO
NO
resolder or change
resolder or change
resolder or change
ANT700,R708 contact ?
CHECK
C732,CN700
F700
CONTINUOUS RX ON
RF INPUT : 62CH
AMP : -50dBm
YES
U700
pin 9,31: 2.8V ?
YES
U700 CHECK
pin 8 : 13MHz ?
Vp-p : 950mV?
YES
U700
pin1,2,3,28 Vp-p
: 120mV ?
YES
U100 CHECK!!
NO
NO
NO
U100 pinA13, C119
change or resolder
OSC700
change or resolder
U700
resolder or change
2-7
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SGH-S342i Flow Chart of Troubleshooting
2. DCS RX
CONTINUOUS RX ON
RF INPUT : 698CH
AMP : -50dBm
NORMAL CONDITION
catch the channel?
YES
F700 CHECK
pin13≥-65dBm ?
YES
F700 CHECK
pin3,4≥-65dBm ?
YES
U700 CHECK
pin18, 19≥-65dBm ?
YES
U700
pin 9, 31: 2.8V ?
YES
U700 CHECK
pin 8 : 13MHz ?
Vp-p : 950mV?
NO
NO
NO
NO
NO
NO
ANT501,R708 contact ?
CHECK
C732,CN700
resolder or change
F700
resolder or change
C734,C735,L707
resolder or change
U100 pinA13, C119
change or resolder
OSC700
change or resolder
YES
U700
pin1,2,3,28 Vp-p
YES
U100 CHECK!!
NO
U700
resolder or change
2-8
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