Samsung SGH-X461 User manual

GSM TELEPHONE
SGH-X461
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. Exploded and assembling View

1. SGH-X461 Specification
1-1
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. GSM General Specification

SGH-X461 Specification
1-2
1-2. GSM Tx Power Class
TX Power
control level GSM900
5 33±2 dBm
6 31±2 dBm
7 29±2 dBm
8 27±2 dBm
9 25±2 dBm
10 23±2 dBm
11 21±2 dBm
12 19±2 dBm
13 17±2 dBm
14 15±2 dBm
15 13±2 dBm
16 11±3 dBm
17 9±3dBm
18 7±3 dBm
19 5±3 dBm
TX Power
control level DCS1800
0 30±3 dBm
1 28±3 dBm
2 26±3 dBm
3 24±3 dBm
4 22±3 dBm
5 20±3 dBm
6 18±3 dBm
7 16±3 dBm
8 14±3 dBm
9 12±4 dBm
10 10±4 dBm
11 8±4dBm
12 6±4 dBm
13 4±4 dBm
14 2±5 dBm
15 0±5 dBm
TX Power
control level PCS1900
0 30±3 dBm
1 28±3 dBm
2 26±3 dBm
3 24±3 dBm
4 22±3 dBm
5 20±3 dBm
6 18±3 dBm
7 16±3 dBm
8 14±3 dBm
9 12±4 dBm
10 10±4 dBm
11 8±4dBm
12 6±4 dBm
13 4±4 dBm
14 2±5 dBm
15 0±5 dBm

2. SGH-X461 Flow Chart of Troubleshooting
2-1
2-1. Baseband
2-1-1. Power ON
check the current
consumption
>= 100mA Download again
'Power ON' does not work
No
Yes
Yes
END
Yes
Check the Initial Operation
Yes
Charge the battery
No
Check the Voltage
of the Battery
>= 3.3V
check keypad
No
Check the pin C212,
C213,C214, C215
of U200 is
>=2.8V
Check
"Power On"
key?
No
check U100 and C100
Yes 1
Checktheclocksignalat
pin #1 of U802
Freq=26Mhz,
Vrms >=300mV
No Check the clock generation
circuit U802
Yes
2

SGH-X461 Flow Chart of Troubleshooting
2-2

SGH-X461 Flow Chart of Troubleshooting
2-3
2-1-2. Initial
Initial Failure
check the pin
RSTB of U600 is
LOW?
Check U600
No
Yes
Yes
END
Yes
Check the Initial Operation
Yes
Check
R801,R802,C813,C815
No
check the pin CKI
of U600 is 13Mhz?
Check the clock signal
at pin #3 of U802
Freq=26Mhz?
No check U802
1
Check the pin #9 of U600
is HIGH and pin #11,
#13 is 2.9V?
No Check U100
Yes
2
3
4

SGH-X461 Flow Chart of Troubleshooting
2-4

SGH-X461 Flow Chart of Troubleshooting
2-5
2-1-3. Sim Part
"Insert SIM" is displayed on the LCD
Is there any signal
pin #2,3,4 of CN100?
Check the U100
Check the U100 & U600
END
No
Yes
No
Yes
1
2
Check the SIM Card
The voltage is 2.8V
at the pin#1 of CN100

SGH-X461 Flow Chart of Troubleshooting
2-6

SGH-X461 Flow Chart of Troubleshooting
2-7
2-1-4.Microphone Part
* Call with Sim before testing.
Check the soldered
status of microphone
MicroPhone does not work
Resolder microphone
END
No
Yes
Yes
Check the reference
voltage on mic path
R420 ≒2.0V
Yes
Resolder or change C423
No
Is microphone OK?
Yes
Check U100
No
1
2

SGH-X461 Flow Chart of Troubleshooting
2-8

SGH-X461 Flow Chart of Troubleshooting
2-9
2-1-5. Speaker Part
Check the connection
status of LCD connector
HDC800
There is no sound from speaker
Are there any signal at
the speaker pad on LCD
PCB?
reconnect HDC800
Replace the speaker module
END
No
Yes
No
No
Yes
Check R401, R402 of
U402. Voltage is ≥1V?
1
Yes
Check U500
2

SGH-X461 Flow Chart of Troubleshooting
2-10

SGH-X461 Flow Chart of Troubleshooting
2-11
2-1-6. LCD backlight
Backlight ON "TIME"
mode in the menu?
Backlight does not work
Check conecting
between PBA and LCD
conector
Select backlight "15 sec" mode
Check FPCB
END
No
Yes
No
Check U300 pin #8 =
10V ? Check the LCD
Yes
Yes
No

SGH-X461 Flow Chart of Troubleshooting
2-12
2-2. RF
2-2-1. GSM Rx
Normal condition
catch the
channel ?
Check U102
pin 12 ≥-65
dbm ?
Check U801
pin 21,22 ≥-
65dBm ?
Yes
No
No
Check U102
pin 16 ≥-65
dbm ?
Yes
No
Yes
Check ANT, R101,R102,U909,L103
Resolder or change
CON900, L903, C902, C901, C903, L904
Resolder or change
U102
Resolder or change
F900
Resolder or change
U600
CONTINOUS RX ON
RF INPUT : 62CH
AMP : -50dbm
Check U101
pin 13 = 2.8V
Yes
Resolder or change
U100
Yes
No
No
1
2
3
4
5

SGH-X461 Flow Chart of Troubleshooting
2-13

SGH-X461 Flow Chart of Troubleshooting
2-14
2-2-2. DCS Rx
Normal condition
catch the
channel ?
Check U102
pin 12 ≥-65
dbm ?
Check U101
pin 19,20 ≥-
65dBm ?
Yes
No
No
Check U102
pin 16 ≥-65
dbm ?
Yes
No
Yes
Check ANT,R101,R102,U909,L103
Resolder or change
CON900, L903, C902, C901, C903, L904
Resolder or change
U102
Resolder or change
F900
Resolder or change
U600
CONTINOUS RX ON
RF INPUT : 698CH
AMP : -50dbm
Check U801
pin 13 = 2.8V
Yes
Resolder or change
U100
Yes
No
No
1
2
3
4
5

SGH-X461 Flow Chart of Troubleshooting
2-15

SGH-X461 Flow Chart of Troubleshooting
2-16
2-2-3. PCS Rx
CONTINOUS RX ON
RF INPUT : 660CH
AMP : -50dbm
Normal condition
catch the
channel ?
Check ANT,R101,R102,U909,L103
No 1
Yes
Check U102
pin 12 ≥-65
dbm ? 2
Resolder or change
CON900, L903, C902, C901, C903, L904
No
Yes
Check U102
pin 16 ≥-65
dbm ?
Resolder or change
U102
No 3
Yes
Check U801
pin 19,20 ≥-
65dBm ?
4
No Resolder or change
F900
Yes
Check U801
pin 13 = 2.8V
No Resolder or change
U100 5
Yes
Resolder or change
U600

SGH-X461 Flow Chart of Troubleshooting
2-17