Samsung SGH-X140 service manual, GSM, Service Manual, Samsung, Seria X, Samsung SGH-X140
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GSM TELEPHONE
SGH-X140
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
ⓒ
Samsung Electronics Co.,Ltd. Feb. 2005
Printed in Korea.
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.
Code No.: GH68-06385A
BASIC.
1. SGH-X140 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-
1
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SGH-X140 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-
2
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2. SGH-X140 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 U101
Pin#J12 >= 2.8V
No
Check U101 and C112
Yes
Pin#A13 and
pin#A14 =2.8V
No
pin#G11 =
1.8V
No
Check U101 and C115
Yes
Yes
Checktheclocksignalatpin#27ofU404
Freq = 13MHz
Vrms >=300mV
Vpp
≒
900mV
No
Check the clock generation circuit
(related to OSC401)
Yes
Check the initial operation
END
2-
1
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