Samsung SGH-X120 service manual, SCHEMATY SERWISOWE, SAMSUNG, SERIA X, SGH-X120
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GSM TELEPHONE
SGH-X120
GSM TELEPHONE
CONTENTS
1. Specification
2. Flow Chart of Troubleshooting
3. ExplodedViewsandPartsLis
4. Electrical Parts List
5. Block Diagram
6. PCB Diagrams
1. SGH-X120 Specification
1. GSM General Specification
GSM900
Phase 1
EGSM 900
Phase 2
DCS1800
Phase 1
Freq. Band[MHz]
Uplink/Downlink
890~915
935~960
880~915
925~960
1710~1785
1805~1880
ARFCN range
1~124
0~124 &
975~1023
512~885
Tx/Rx spacing
45MHz
45MHz
95MHz
Mod. Bit rate/
Bit Period
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
Modulation
0.3GMSK
0.3GMSK
0.3GMSK
MS Power
33dBm~13dBm 33dBm~5dBm 30dBm~0dBm
Power Class
5pcl ~ 19pcl
5pcl ~ 19pcl
0pcl ~ 15pcl
Sensitivity
-102dBm
-102dBm
-100dBm
TDMA Mux
8
8
8
Cell Radius
35Km
35Km
2Km
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SGH-X120 Specification
2. GSM TX power class
TX Power
control level
GSM900
TX Power
control level
DCS1800
5
33
±
2dBm
0
30
±
3dBm
6
31
±
2dBm
1
28
±
3dBm
7
29
±
2dBm
2
26
±
3dBm
8
27
±
2dBm
3
24
±
3dBm
9
25
±
2dBm
4
22
±
3dBm
10
23
±
2dBm
5
20
±
3dBm
11
21
±
2dBm
6
18
±
3dBm
12
19
±
2dBm
7
16
±
3dBm
13
17
±
2dBm
8
14
±
3dBm
14
15
±
2dBm
9
12
±
4dBm
15
13
±
2dBm
10
10
±
4dBm
16
11
±
3dBm
11
8
±
4dBm
17
9
±
3dBm
12
6
±
4dBm
18
7
±
3dBm
13
4
±
4dBm
19
5
±
3dBm
14
2
±
5dBm
15
0
±
5dBm
1-
2
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2. SGH-X120 Flow Chart of Troubleshooting
1. Power ON
'Power ON' Does not work
Check the current consumption
Current consumption
≥
100mA ?
NO
Down load again
YES
Check the V bat. voltage
Voltage
≥
3.3V ?
NO
Charge the Battery
YES
Check the pin of U300
pin #11
≥
2.8V ?
NO
Check U300 and C313
YES
pin #39 and #33 = 2.8V
NO
YES
Pin #9=1.8V?
NO
Check U300 and C312
YES
Checktheclocksignal
at pin #3 of OSC100
Freq.=13MHz,Vrms 300mV
NO
Checktheclockgeneration
circuit (OSC100, U105 pin#4)
YES
Check the Initial operation
END
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SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams
2. System Initial
Initial Failure
The pin #9 of U300 = 1.8V
and pin #11 of U300=2.8V?
NO
Check the U300
(If it has some problem,
it has to be replaced.)
YES
Is the pin #19 of U300
"Low-->High"?
NO
Check the U300
(If it has some problem,
ithastobereplaced.)
YES
There is 32.768KHz wave
form at the C225, C226 ?
NO
Check the U201
YES
Is the pin #25 of U300
is High ?
NO
Check the U200
YES
The voltage is "High"
at the C306,C308,C309 ?
NO
Check the U300
YES
LCD Display OK ?
NO
Check the LCD part
YES
Sound operation OK ?
NO
Check the Audio part
YES
END
2-
2
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