Samsung SGH-C120 service manual, samsung service manuals schematy serwisowki
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GSM TELEPHONE
SGH-C120
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
This Service Manual is a property of Samsung Electronics Co.,Ltd.
Any unauthorized use of Manual can be punished under applicable
International and/or domestic law.
ⓒ
Samsung Electronics Co.,Ltd.
Code No.: GH68-08501A
2005. 11. Rev.1.0
1. SGH-C120 Specification
1-1. 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 ~ 15pcl 5pcl ~ 19pcl
0pcl ~ 15pcl
Sensitivity
-102dBm -102dBm -100dBm
TDMA Mux
8
8
8
Cell Radius
35Km
35Km
2Km
1-
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SGH-C120 Specification
1-2. 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-
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2. SGH-C120 Flow Chart of Troubleshooting
2-1.Baseband
2-1-1. Power ON
'Power On' does not work
Check the current consumption
Yes
Current consumption
>= 100mA
No
Download again
Yes
Check the Vbat Voltage
Voltage >=3.3V
No
Charge the Battery
Yes
Check the pin of U300
Pin#J12 >= 2.8V
No
Check U300 and C315
①
Yes
Pin#A13 and
pin#A14 =2.8V
No
pin#G11 =
1.8V
No
Check U300 and C316
②
Yes
Yes
Checktheclocksignalatpin#8ofU100
③
Freq = 13MHz
Vrms >=300mV
Vpp
≒
900mV
No
Check the clock generation circuit
(related to OSC100)
④
Yes
Check the initial operation
END
2-
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