Samsung SGH-S342i Service Manual
GSM TELEPHONE
SGH-S342i
GSM TELEPHONE |
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CONTENTS |
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1. |
Specification |
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2. |
Flow Chart of Troubleshooting |
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3. |
Exploded Views and Parts List |
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4. |
Electrical Parts List |
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5. |
PCB Diagrams |
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6. |
Block Diagrams |
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1.SGH-S342i Specification
1.GSM General Specification
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GSM900 |
EGSM 900 |
DCS1800 |
PCS1900 |
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Phase 1 |
Phase 2 |
Phase 1 |
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Freq. Band[MHz] |
890~915 |
880~915 |
1710~1785 |
1850~1910 |
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Uplink/Downlink |
935~960 |
925~960 |
1805~1880 |
1930~1990 |
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ARFCN range |
1~124 |
0~124 & |
512~885 |
512~810 |
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975~1023 |
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Tx/Rx spacing |
45MHz |
45MHz |
95MHz |
80MHz |
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Mod. Bit rate/ |
270.833kbps |
270.833kbps |
270.833kbps |
270.833kbps |
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Bit Period |
3.692us |
3.692us |
3.692us |
3.692us |
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Time Slot |
576.9us |
576.9us |
576.9us |
576.9us |
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Period/Frame |
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4.615ms |
4.615ms |
4.615ms |
4.615ms |
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Period |
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Modulation |
0.3GMSK |
0.3GMSK |
0.3GMSK |
0.3GMSK |
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MS Power |
33dBm~13dBm |
33dBm~5dBm |
30dBm~0dBm |
30dBm~0dBm |
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Power Class |
5pcl ~ 15pcl |
5pcl ~ 19pcl |
0pcl ~ 15pcl |
0pcl ~ 15pcl |
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Sensitivity |
-102dBm |
-102dBm |
-100dBm |
-100dBm |
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TDMA Mux |
8 |
8 |
8 |
8 |
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Cell Radius |
35Km |
35Km |
2Km |
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1-1
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
SGH-S342i Specification
2. GSM TX power class
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TX Power |
GSM900 |
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TX Power |
DCS1800 |
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TX Power |
PCS1900 |
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control level |
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control level |
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control level |
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5 |
33±2 dBm |
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0 |
30±3 dBm |
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0 |
30±3 dBm |
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6 |
31±2 dBm |
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1 |
28±3 dBm |
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1 |
28±3 dBm |
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7 |
29±2 dBm |
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2 |
26±3 dBm |
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2 |
26±3 dBm |
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8 |
27±2 dBm |
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3 |
24±3 dBm |
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3 |
24±3 dBm |
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9 |
25±2 dBm |
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4 |
22±3 dBm |
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4 |
22±3 dBm |
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10 |
23±2 dBm |
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5 |
20±3 dBm |
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5 |
20±3 dBm |
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11 |
21±2 dBm |
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6 |
18±3 dBm |
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6 |
18±3 dBm |
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12 |
19±2 dBm |
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7 |
16±3 dBm |
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7 |
16±3 dBm |
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13 |
17±2 dBm |
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8 |
± |
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8 |
± |
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14 3 dBm |
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14 3 dBm |
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15±2 dBm |
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14 |
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9 |
12±4 dBm |
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9 |
12±4 dBm |
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15 |
13±2 dBm |
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10 |
10±4 dBm |
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10 |
10±4 dBm |
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16 |
11±3 dBm |
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11 |
8±4 dBm |
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11 |
8±4 dBm |
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17 |
9± 3dBm |
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12 |
6±4 dBm |
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12 |
6±4 dBm |
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18 |
7±3 dBm |
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13 |
4±4 dBm |
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13 |
4±4 dBm |
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19 |
5±3 dBm |
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14 |
2±5 dBm |
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14 |
2±5 dBm |
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15 |
0±5 dBm |
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15 |
0±5 dBm |
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1-2 |
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SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
2. SGH-S342i Flow Chart of Troubleshooting
1.Baseband
1. Power ON
'Power On' does not work
Check the current consumption |
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Yes |
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Current consumption |
No |
Download again |
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>= 100mA |
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Yes
Check the Vbat Voltage
No
Voltage >=3.3V |
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Charge the Battery |
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Yes
Check the pin of U100
Pin#J12 >= 2.8V |
No |
Check U100 and C111 |
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Yes |
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Pin#A13 and |
No |
pin#G11 = |
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No |
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Check U100 and U114 |
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pin#A14 =2.8V |
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1.5V |
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Yes
Yes
Check the clock signal at pin#27 of U700
Freq = 13MHz |
No |
Check the clock generation circuit |
Vrms >=300mV |
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(related to OSC700) |
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Vpp 900mV |
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Yes
Check the initial operation
END
2-1
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
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
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
LCD display is O.K
Yes
Sound is O.K
Yes
END
No
Check the U100
(if it has some problem, it is to be replaced.)
No
Check the U100
(if it has some problem, it is to be replaced.)
No
Check the U200
No
Check the U700
No
Check the U100
No
Check the LCD part
No
Check the Audio part
2-2
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This Document can not be used without Samsung's authorization
SGH-S342i Flow Chart of Troubleshooting
3. Sim Part
"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
Resolder or change CN100
No
Check the U100
No
Check the U200
2-3
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
SGH-S342i Flow Chart of Troubleshooting
4. Microphone Part
Microphone does not work |
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Yes |
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No |
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Is the assembled status |
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Reassembled the microphone |
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of microphone O.K? |
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Yes
Check the reference voltage on mic path
Yes
Resolder or change
No
C406 2.0V ? 
R406,C416,R407,C405,R410,C413,
R421,C421,R420,R425,C427,C422
Yes
No
Is microphone ok? |
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Check U700 |
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Yes
END
2-4
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
SGH-S342i Flow Chart of Troubleshooting
5. Speaker Part
There is no sound from the Speaker
Is the terminal of Speaker
O.K ?
Yes
Are there any signals at the C502,C503
Yes
No
Replace the Speaker
No
Check LCD or Replace CN500
No
Check the
U401
Yes
Is there any signals at the pin#5 and pin#7 of U400 ?
Yes
The pin#4 of
U400 is "Low"
The type of sound from the Speaker is Melody
No No
No
Is there any signals at the pin#2 and pin#10 of U400 ?
Yes
The pin#4 of
U400 is "High"
Yes |
Yes |
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Check the U200 |
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Check the U400 |
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END |
No
Check the
U401
2-5
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
SGH-S342i Flow Chart of Troubleshooting
6. Camera Part
"Camera" function dose not work
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Yes |
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Check the connect |
No |
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Connect the camera module |
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CN500 |
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Yes |
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No |
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U302 PIN 5 = 2.8V? |
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Check U202 and C210 |
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Yes |
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No |
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R402 < 25MHz |
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C308, U301 |
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END |
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2-6
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
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 ?
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!!
CONTINUOUS RX ON
RF INPUT : 62CH
AMP : -50dBm
NO |
CHECK |
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ANT700,R708 contact ? |
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NO
C732,CN700 resolder or change
NO |
F700 |
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resolder or change |
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NO
resolder or change
NO |
U100 pinA13, C119 |
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change or resolder |
NO
OSC700 change or resolder
NO
U700 resolder or change
2-7
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This Document can not be used without Samsung's authorization
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