Samsung SGH-X120 User manual

SGH-X120
SERVICE
Manual
GSM TELEPHONE CONTENTS
1. Specification
2. Flow Chart of Troubleshooting
3. Exploded Views and Parts Lis
4. Electrical Parts List
5. Block Diagram
6. PCB Diagrams
GSM TELEPHONE

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1. SGH-X120 Specification
1-1
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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

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SGH-X120 Specification
1-2
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2. GSM TX power class
TX Power
control level DCS1800
0 30±3dBm
1 28±3dBm
2 26±3dBm
3 24±3dBm
4 22±3dBm
5 20±3dBm
6 18±3dBm
7 16±3dBm
8 14±3dBm
9 12±4dBm
10 10±4dBm
11 8±4dBm
12 6±4dBm
13 4±4dBm
14 2±5dBm
15 0±5dBm
TX Power
control level GSM900
5 33±2dBm
6 31±2dBm
7 29±2dBm
8 27±2dBm
9 25±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

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2. SGH-X120 Flow Chart of Troubleshooting
2-1
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1. Power ON
'Power ON' Does not work
Check the current consumption
Current consumption
≥100mA ?
Check the V bat. voltage
Down load again
Voltage ≥ 3.3V ?
Check the pin of U300
pin #11 ≥ 2.8V ?
Pin #9=1.8V?
Check the Initial operation
END
pin #39 and #33 = 2.8V
Charge the Battery
Check the clock generation
circuit (OSC100, U105 pin#4)
Check the clock signal
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

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SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams
2-2
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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,
it has to be replaced.)

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SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams
2-3
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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

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SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams
2-4
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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(fullcharging)?
YES
YES
Solder again or change
R322
NO

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SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams
2-5
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C310
10UF
10V
VPAC
100NF
C305
C309
10UF
10V
1
3
2
TA_VEXT
VBAT
VCC_1.8A
CHG_ON
VRF VRTCVBAT
Q302 1
3
2
VCCD
100PF
C315
10K,1%
C313
C301
33PF
100NF
10V
C317
10UF
390K
R309
R323
47K,1%
VCCB
POWER
2
U301
DRIVE 6
GND
R319
VRTC
VBAT
C307
2.2UF
VOSC
10V
C329
33PF
4
CN300
1
1
22
3
3
4
C306
5
5
66
7
GG
89 GG 10
100NF
C303
C316
10UF
R316
33
VLDO_5
VLDO_6 42
VLDO_7 40
30
VREF
12
VRTC
48
VSIM
C304
100NF
2
5
6
3
1
4
1ISENSE
PROG 43 VCC
5
VSENSE
C312
2.2UF
$V
C325
1UF
C314
2.2UF
2.2UF
Q301
R322
Q303
R324
3K,1%
10K,1%
C302
33PF
Q300
3
1
2
5
6
4
VCCA
0
D300
VL4S_A 36
35
VL4S_B
VL5S_A 32
31
VL5S_B
9
VLDO_1
11
VLDO_2
VLDO_3 39
37
VLDO_4
3VACC
2VBAT
VDD12 10
38
VDD34
34
VDD5
41
VDD67
VEXT
1
4
VIB_DRV
15 SDI
16 SDO
50
SIM_CLK
SIM_IO
51
SIM_RST
49
UP_CLK
53
52 UP_IO
54 UP_RST
PWR_KEEP
21
46 PWR_SW1N
PWR_SW2
47
19
RESETN
RING_DRV
5
55 RING_PWM
RTC_ALMN
13
17 SCLK
GND
66
GNDD
60
6
GNDD1
GNDQ
28
INTRQ
14
LED1_DRV
78
LED2_DRV
20 PSW1_BUF
GND
68
GND
58
59 GND
GND
61
62GND
GND
63
64GND
65GND
EN_3
22
23 EN_4[0]
EN_4[1]
24
25 EN_5
EN_5A
26
27 EN_5B
57 GND
67GND
U300
44 ADC_AUX1
ADC_AUX2
45 ADC_TRIG
56
43 BTEMP
CREF
29
CSN
18
2
NEG
1POS
C326
R318
1.2K
M1
C300
33PF
2.2UF
C308
330K
2.2UF
470NF
C311
UP_SDI
UP_SCLK
UP_CS
ICHRG
TA_VEXT
VREF
SIMDATA
SIMRST
SIMCLK
CHG_DET
PWR_ON
JIG_ON
RTCALARM
EN_VRF
EN_VPAC
XOENA
KEY_ROW(0)
KEY_COL(2)
TA_VEXT
PWR_KEEP
RST

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SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams
2-6
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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

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SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams
2-7
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6. Speaker Part
Is the terminal of speaker
is O.K?
NO Replace the speaker
There is no sound from speaker
YES
Thetypeofsoundfrom
the speaker is Melody?
YES NO
Are there any signal
at the pin #5,7 of U401?
Are there any signal
at the pin #3,9 of U401?
Check
U201,
U401
NO NO
Pin #4 of U401
is Low?
Pin #4 of U401
is High?
Check U402 Check U200
NO NO
YES YES
YES
YES
END