Samsung SGH-X120 User manual

SGH-X120
GSM TELEPHONE
1. Specification
2. Flow Chart of Troubleshooting
3. ExplodedViewsandPartsLis
4. Electrical Parts List
5. Block Diagram
6. PCB Diagrams
GSM TELEPHONE CONTENTS

SAM SUNG Proprietary-C ontents maychange withoutnotice
1. SGH-X120 Specification
1-1
This Document can not be used without Samsung's authorization
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

SAM SUNG Proprietary-C ontents maychange withoutnotice
SGH-X120 Specification
1-2
This Document can not be used without Samsung's authorization
2. GSM TX power class
TX Power
control level DCS1800
030±3dBm
128±3dBm
226±3dBm
324±3dBm
422±3dBm
520±3dBm
618±3dBm
716±3dBm
814±3dBm
912±4dBm
10 10±4dBm
11 8±4dBm
12 6±4dBm
13 4±4dBm
14 2±5dBm
15 0±5dBm
TX Power
control level GSM900
533±2dBm
631±2dBm
729±2dBm
827±2dBm
925±2dBm
10 23±2dBm
11 21±2dBm
12 19±2dBm
13 17±2dBm
14 15±2dBm
15 13±2dBm
16 11±3dBm
17 9±3dBm
18 7±3dBm
19 5±3dBm

2. SGH-X120 Flow Chart of Troubleshooting
2-1
1. Power ON
'Power ON' Does not work
Check the current consumption
Current consumption
≥100mA ?
Check the V bat. voltage
Down load again
Check the pin of U300
Pin #9=1.8V?
Check the Initial operation
END
pin #39 and #33 = 2.8V
Charge the Battery
Checktheclockgeneration
circuit (OSC100, U105 pin#4)
Checktheclocksignal
at pin #3 of OSC100
Freq.=13MHz,Vrms 300mV
Check U300 and C312
Check U300 and C313
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
Voltage ≥3.3V ?
pin #11 ≥2.8V ?

SAM SUNG Proprietary-C ontents maychange withoutnotice
SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams
2-2
This Document can not be used without Samsung's authorization
2. System Initial
The pin #9 of U300 = 1.8V
and pin #11 of U300=2.8V?
Initial Failure
Is the pin #19 of U300
"Low-->High"?
There is 32.768KHz wave
form at the C225, C226 ?
Is the pin #25 of U300
is High ?
The voltage is "High"
at the C306,C308,C309 ?
LCD Display OK ?
Sound operation OK ?
END
Check the U201
Check the U200
Check the U300
Check the LCD part
Check the Audio part
YES
NO
NO
NO
NO
YES
YES
YES
YES
YES
NO
NO
NO
YES
Check the U300
(If it has some problem,
it has to be replaced.)
Check the U300
(If it has some problem,
ithastobereplaced.)

SAM SUNG Proprietary-C ontents maychange withoutnotice
SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams
2-3
This Document can not be used without Samsung's authorization
3. SIM Part
Is there any signal
pin #52,53,54 of U300 ? Check the U201
"Insert SIM" is displayed on the LCD
END
Check the SIM Card
YES
NO
NO
YES
Is there any signal
pin #1,2,3,6 of CN300 ? Check the U300

SAM SUNG Proprietary-C ontents maychange withoutnotice
SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams
2-4
This Document can not be used without Samsung's authorization
4. Charging Part
The pin #17,18 of CN301
(VEXT) is 5V ? Replace TA or check CN301
Abnormal charging operation
END
Check the U302
YES
NO
NO
The pin#6 OF U302 LOW?
YES
The pin#2 of U302 is Low?
YES
Check the U302
NO
The pin#5 of U301 is
3.2~4.2V? Check the U301
NO
The ICHRG =1V(during charging)
& 180mV(full charging)?
YES
YES
Solder again or change
R322
NO

SAM SUNG Proprietary-C ontents maychange withoutnotice
SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams
2-5
This Document can not be used without Samsung's authorization
5. Microphone Part
Micro-phone does not work
Is the assembled status of
Microphone O.K?
YES
Reassemble the microphone
NO
Check the DC bias voltage on
Mic path.
The voltage of C476 is
2.2V±10%? NO Solder the microphone again
or Replace
C434,C476,R416,R415,R440
Is microphone OK? NO Check U300
END
YES
YES

SAM SUNG Proprietary-C ontents maychange withoutnotice
SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams
2-6
This Document can not be used without Samsung's authorization
6. Speaker Part
Is the terminal of speaker
is O.K? NO Replace the speaker
There is no sound from speaker
YES
The type of sound from
the speaker is Melody?
YES NO
Check
U201,
U401
NO NO
Pin #4 of U401
is Low? Pin #4 of U401
is High?
Check U402
NO NO
YES YES
YES
YES
END
Are there any signal
at the pin #5,7 of U401? Are there any signal
at the pin #3,9 of U401?
Check U200

SAM SUNG Proprietary-C ontents maychange withoutnotice
SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams
2-7
This Document can not be used without Samsung's authorization
7. EGSM Receiver
Continuous RX ON
RF Input : 62 CH
AMP : -50dBm
NORMAL CONDITION
Catch the channel ?
YES
NO
U100 Check
Pin #6 ≥-65dBm ?
U100 Check
Pin #11 ≥-65dBm ?
U103 Check
Pin#20,21 ≥-65dBm ?
Check soldered status of
C102
CON101
Resolder or Change
U100 Resolder or Change
U103 Check
Pin#9,32=Clean 2.8V?
U103 Check
Pin#28,1,2,3=100mV?
U300, C306, C308
Check or resolder
Check U200
NO
NO
YES
YES
YES
YES
NO
YES
U103 Check
Pin #8 : 13MHz ?
Vpp : 860mV?
OSC100 Check
Pin #8 : 13MHz ?
Vpp : 950mV?
OSC100 Check
Pin #4 = 2.8V ?
U103
Change or resolder
NO
NO NO
C129, R114
resolder OSC100 Change or resolder
YES YES YES
NO
Check soldered status of
C117, 118, L103, U104
U104 Check
Pin #1 ≥-65dBm ?
Check soldered status of
C114 &
U100 Resolder or Change
NO
YES
NO