Telefon - Samsung SGH-X481

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GSM TELEPHONE
SGH-X481
GSM TELEPHONE
CONTENTS
1. Specification
2. Flow Chart of Troubleshooting
3. Exploded View and Parts List
4. Electrical Parts List
5. PCB Diagrams
6. Block Diagrams
7. Disassembly and
Assembly instructions
1. SGH-X481 Specification
1-1. GSM General Specification
GSM900
Phase 1
EGSM 900
Phase 2
DCS1800
Phase 1
PCS1900
Freq. Band[MHz]
Uplink/Downlink
890~915
935~960
880~915
925~960
1710~1785
1805~1880
1850~1910
1930~1990
ARFCN range
1~124
0~124 &
975~1023
512~885
512~810
Tx/Rx spacing
45MHz
45MHz
95MHz
80MHz
Mod. Bit rate/
Bit Period
270.833kbps
3.692us
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
576.9us
4.615ms
Modulation
0.3GMSK
0.3GMSK
0.3GMSK
0.3GMSK
MS Power 33dBm~13dBm 33dBm~5dBm 30dBm~0dBm 30dBm~0dBm
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
SGH-X481 Speclflcation
1-2. GSM Tx Power Class
TX Power
control level
GSM900
TX Power
control level
DCS1800
TX Power
control level
PCS1900
5
33±2 dBm
0
30±3 dBm
0
30±3 dBm
6
31±2 dBm
1
28±3 dBm
1
28±3 dBm
7
29±2 dBm
2
26±3 dBm
2
26±3 dBm
8
27±2 dBm
3
24±3 dBm
3
24±3 dBm
9
25±2 dBm
4
22±3 dBm
4
22±3 dBm
10
23±2 dBm
5
20±3 dBm
5
20±3 dBm
11
21±2 dBm
6
18±3 dBm
6
18±3 dBm
12
19±2 dBm
7
16±3 dBm
7
16±3 dBm
13
17±2 dBm
8
14±3 dBm
8
14±3 dBm
14
15±2 dBm
9
12±4 dBm
9
12±4 dBm
15
13±2 dBm
10
10±4 dBm
10
10±4 dBm
16
11±3 dBm
11
8±4dBm
11
8±4dBm
17
9±3dBm
12
6±4 dBm
12
6±4 dBm
18
7±3 dBm
19
5±3 dBm
13
4±4 dBm
13
4±4 dBm
14
2±5 dBm
14
2±5 dBm
15
0±5 dBm
15
0±5 dBm
1-2
2. SGH-X481
Flow Chart of Troubleshooting
2-
1. Baseband
2-1-1. Power ON
'Power ON' does not work
check the current
consumption
>= 100mA
No
Download again
Yes
Check the Voltage
of the Battery
>= 3.3V
No
Charge the battery
Yes
Check the pin C101,
C102,C103 of U100
is
>=2.8V
No
Check
"Power On"
key?
No
check keypad
Yes
1
check
U100
and
C101
Yes
Check the clock
signal at pin #4 of
OSC600
No Check the clock generation
circuit OSC600
2
Yes
Check the Initial Operation
Yes
END
2-1
SGH-X481 Flow Chart of Troubleshooting
2-2
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