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

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SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams
2-8
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VCCA
R418
ZD406
AUXOUT
JACK_IN
AUXIN
MICIN
MICOUT
MIC_M
R417
10K
39PF
R425
NC
VCCA
1NF
NC
R435
C448
180PF
1.2K
C437
39PF
39PF
C439
100nH
L403
1UF
C434
CN401
1
2
3
4
0
R422
10K
C442
33UF
R423
0
1K
R430
33PF
C449
1K
NC
C436
82PF
33PF
R431
R426
C453
C451
39PF
MIC_P
82K,1%
R416
R433
51K
62K,1%
C452
EAR_SWITCH
AOUTBN
AOUTBP
82K,1%
R432
NC
R420
100nH
L404
F400
1
23
4
0
33UF
C476
R427
VCCA
ZD407
100K
R419
1UFJACK_IN
EAR_SPK_N
EAR_MIC_N
EAR_MIC_P
AUDIO
EAR_SPK_P
R429
1K
23
1
R434NC
VCCD
Q401
R424
NC
R421
4.7K
33PF
C447
C455
33PF
ZD409
6.3V
C445
33UF
C441
33UF
6.3V
VCCA
C443
470nF
1NF
C456
C440
C444
R428
5
6
ZD408
R415L401
100nH
C435
1NF
C457
8PF
C438
820PF
1.2K
R440
4.7K
C450
470nF
C477100nH
L402
C446
560PF
1NF
C454

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SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams
2-9
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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

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SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams
2-10
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8. EGSM Transmitter
Continuous TX ON condition
TX Power Code : 500 code Applied
CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF. Level : 10dBm
ATT. : 20dB
C103
=3.7V?
Change U101
NO
YES
U100 Pin#6
About 2~3 dBm? U100
Pin#10 = High? U200, Q202
Check & Change
NO
U102, CON101
Check & Change
YES
U100
Check & Change
YES
Check the
Battery Block
Level of
U101 Pin #6 is
1.2V?
Check
&ChangeR107
OK ?
U200
Check & Change
YES
YES
NO
NO NO
NO
U101 pin#7
About -5 dBm?
U101 pin#3
High ? Check U200
YES
NO
YES
U103 Check
Pin#9,32 ≥ 2.8V ?
U103 Check
Pin #8 : 13MHz ?
Vpp : 860mV?
OSC100 Check
Pin #8 : 13MHz ?
Vpp : 950mV?
OSC100 Check
Pin #4 = 2.8V ?
NO
YES
NO
NO NO
R114, C129
resolder
OSC100
Change or resolder
YES YES YES
NO
U300, C306, C308
Check or resolder
U401 Pin
#4,5,6,7 = 1.7V?
YES
Change U101Check U200
NO
YES
Level of
U100 Pin#7 is
4~5dBm ?

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SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams
2-11
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9. DCS Receiver
Continuous RX ON
RF Input : 660 CH
AMP : -50dBm
NORMAL CONDITION
Catch the channel ?
YES
NO
U100 Check
Pin #6 ≥ -65dBm ?
U100 Check
Pin #3 ≥ -65dBm ?
U103 Check
Pin#18,19 ≥ -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
R129, 114
resolder
OSC100
Change or resolder
YES YES YES
NO
Check soldered status of
C107, 115, ,L102, U102
U102 Check
Pin #1 ≥ -65dBm ? Check soldered status of
C114, 116
NO
YES
NO

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SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams
2-12
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10. DCS Transmitter
Continuous TX ON condition
TX Power Code : 350 code Applied
CH : 660
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF. Level : 10dBm
ATT. : 20dB
C104
=3.7V?
Change U101
NO
YES
U100 Pin#6
About 2~3 dBm? U100
Pin#4 = High? U200,Q203
Check & Change
NO
C102, CON101
Check & Change Level of
U100 Pin#5 is
4~5dBm ?
YES
U100, L100, C106, C114
Check & Change
YES
Check the
Battery Block
Level of
U101 Pin #6 is
1.2V?
Check
&ChangeR107
OK ?
U200
Check & Change
YES
YES
NO
NO NO
NO
U101 pin#1
About -5 dBm?
U101 pin#3
High ? Check U200
YES
NO
YES
U103 Check
Pin#9,32 ≥ 2.8V ?
U103 Check
Pin #8 : 13MHz ?
Vpp : 860mV?
OSC100 Check
Pin #8 : 13MHz ?
Vpp : 950mV?
OSC100 Check
Pin #4 = 2.8V ?
NO
YES
NO
NO NO
R129, 114
resolder OSC100
Change or resolder
YES YES YES
NO
U300, C306, 308
Check or resolder
U103 Pin
#4,5,6,7 = 1.7V?
YES
Change U101
Check U200
NO
YES

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SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams
2-13
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C121
1UF
DCS_TX_EN
GSM_TX_EN
8
XOUT
27
10
_PDN
_SEN
12
VPAC
R101
10
0
100K
R107
1PF
C110
820
VRF
VRF
GSM_LNA_IN_P
GSM_LNA_IN_N
DCS_LNA_IN_N
DCS_LNA_IN_P
2
BAND
U101
L100
3.9nH
C112
1NF
R102
4
C107
3PF
TXQP
GSM_LNA_IN_N
GSM_LNA_IN_P
DCS_LNA_IN_N
GSM_PAM_IN
DCS_PAM_IN
SERCLK
SERDAT
SI_EN
SERLE
EGSM_RX
U100ANT
8
DCS_RX
1
DCS_TX
3
10
TRANSMITTER&RECEIVER
VBAT
NC
C100
NC
C116
R100
2
47PF
C102
CN100
1
12
11
VC1
2
VC2
C119
NC
5EGSM_TX
G
4
6
G
7
G
9
G
G
12
13
G
G
14
18PF
C114
56nH
L105
$V
VCC2
812
VCC2
6
VRAMP
VREG
5
33PF
C111
DCSIN
1
13
GND
GSM850/900IN
7
GSM850/900OUT
9
11
PCSOUT
3
TXEN
4
VBATT
10
VCC
U102
2
G
5
G
IN
13
OUT
OUT
270
R106
R103
820
0.5PF
C106
C115
3PF
18NH
L102
3.9nH
C118L103
100PF
1PF
C131
NC
C120
C104
100UF
6.3V
G14
G2
IN
1OUT2
CON101
3
IN
13
OUT
OUT4
C103
100NF
U104
2
GG
5
22NF
C122
220
R105
11
TXIN5
TXIP4
TXQN7
6
TXQP
9
VDD
32
VDD
XEN
26
XIN
22
RFOG
23
RXIN3
2
RXIP
1
RXQN
28
RXQP
SCLK
13
SDI
14
SDO
NC
NC38
RFIDN
19
RFIDP
18
RFIGN
21
20RFIGP
RFIPN
17
RFIPP
16
RFOD
15
GND
2930
GND
31
GND
GND
33
GND
34
35
GND
GND36
37
U103
DIAG1
24
DIAG2
25
GND
20PF
C113
NC
C101
C105
10NF
0
15
R104
0.5PF
C109
R108
270PF
C108
C117
1PF
RXIP
RXIN
RXQP
RXQN
CLK13M_RF
DCS_LNA_IN_P
TXIN
TXIP
TXQN
TXPOWER
TX_BAND_SEL
GSM_PAM_IN
DCS_PAM_IN
TX_EN

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3. SGH-X120 Exploded View and its Parts list
3-1
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1. Cellular phone Exploded View

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SGH-X120 Exploded view and its Part list
3-3
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2. Cellular phone Parts list
Location
NO. Description SEC CODE Remark
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27

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SGH- X120 Exploded view and its Part list
3-3
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3. Test Jig (GH80-00865A)
3-1. RF Test Cable
(GH39-00182A)
3-2. Test Cable
(GH39-00127A)
3-3. Serial Cable
3-4. Power Supply Cable 3-5. DATA CABLE
(GH39-00159A)
3-6. TA
(GH44-00482A)

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4. SGH-X120 MAIN Electrical Parts List
4-1
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  
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 
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 
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 
 
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  
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