Samsung_SGH-X450_service_manual.pdf

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GS M
T ELEP H O N E
SERVICE
GSM TELEPHONE
1.
2.
3.
4.
5.
6.
7.
Manual
CONTENTS
Specification
Circuit Description
E
xploded Views and Parts L
ist
E
lectrical Parts L
ist
Block Diagrams
PCB Diagrams
Flow Chart of Troubleshooting
ELECTRONICS
1 . SGH - x 4 5 0
S p e c if ic a t io n
1. GSM General Specif ication
GS M9 0 0
Ph a se 1
F r eq . B a n d [M Hz ]
Up l in k / Do w n li n k
A RF C N r a n g e
8 9 0 ~9 1 5
9 3 5 ~9 6 0
1 ~1 2 4
E GS M 9 0 0
Ph a se 2
8 8 0 ~9 1 5
9 2 5 ~9 6 0
0~124 &
9 7 5 ~1 0 2 3
4 5 MHz
2 7 0 .8 3 3 k b p s
3 .6 9 2 u s
5 7 6 .9 u s
4 .6 1 5 m s
0 .3 G MS K
3 3 d Bm ~5 d B m
5pcl ~ 19pcl
- 1 0 2 d Bm
8
3 5 Km
DC S 1 8 0 0
P h as e 1
1 7 1 0 ~1 7 8 5
1 8 0 5 ~1 8 8 0
5 1 2 ~8 8 5
PC S1 9 0 0
1 8 5 0 ~1 9 1 0
1 9 3 0 ~1 9 9 0
5 1 2 ~8 1 0
T x /R x s p ac in g
Mo d . B i t r at e/
Bi t Pe r i o d
Ti me Sl o t
P er io d / F r am e P er i o d
Mo d u l a ti o n
M S P o we r
Po w er C l as s
Se n si t iv i t y
TDM A M u x
C el l Ra d iu s
4 5 MHz
270.833kbps
3.692us
576.9us
4 .6 1 5 m s
0 .3 G MS K
3 3 d Bm ~1 3 d B m
5 p cl ~ 1 5 p c l
-102dBm
8
3 5 Km
9 5 M Hz
270.833kbps
3.692us
576.9us
4 .6 1 5 m s
0 .3 GM SK
3 0 d B m ~0 d B m
0pcl ~ 15pcl
-100dBm
8
2 Km
8 0 MH z
2 7 0 .8 3 3 k b p s
3 .6 9 2 u s
5 7 6 .9 u s
4 .6 1 5 ms
0 .3 GM SK
3 0 d B m~0 d B m
0pcl ~ 15pcl
-100dBm
8
-
1- 1
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This Document can not be used without Samsung's authorization
SG X450 Specification
H-
2. GSM TX power class
TX Power
control level
5
GSM900
TX Power
control level
0
DCS1800
TX Power
control level
0
PCS1900
33¡¾2 dBm
30¡¾2 dBm
30¡¾2 dBm
6
31¡¾2 dBm
1
28¡¾3 dBm
1
28¡¾3 dBm
7
29¡¾2 dBm
2
26¡¾3 dBm
2
26¡¾3 dBm
8
27¡¾2 dBm
3
24¡¾3 dBm
3
24¡¾3 dBm
9
25¡¾2 dBm
4
22¡¾3 dBm
4
22¡¾3 dBm
10
23¡¾2 dBm
5
20¡¾3 dBm
5
20¡¾3 dBm
11
21¡¾2 dBm
6
18¡¾3 dBm
6
18¡¾3 dBm
12
19¡¾2 dBm
7
16¡¾3 dBm
7
16¡¾3 dBm
13
17¡¾2 dBm
8
14¡¾3 dBm
8
14¡¾3 dBm
14
15¡¾2 dBm
9
12¡¾4 dBm
9
12¡¾4 dBm
15
13¡¾2 dBm
10
10¡¾4 dBm
10
10¡¾4 dBm
16
11¡¾3 dBm
11
8¡¾4dBm
11
8¡¾4dBm
17
9¡¾3dBm
12
6¡¾4 dBm
12
6¡¾4 dBm
18
7¡¾ dBm
3
13
4¡¾4 dBm
13
4¡¾4 dBm
19
5¡¾ dBm
3
14
2¡¾5 dBm
14
2¡¾5 dBm
15
0¡¾5 dBm
15
0¡¾5 dBm
1- 2
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2 . SGH - X4 5 0
C ir c u it
D e s c r ip t io n
1. SGH- X450 RF Circuit Description
1) RX PART
1. ASM(U201) ¡æ
Switching Tx, Rx path for E`GSM900, DCS1800 and PCS1900 by logic controlling.
2. ASM Control Logic (U501, U502, U503) ¡æ Truth Table
VC1
GSM Tx Mode
DCS / PCS Tx Mode
PCS Rx Mode
GSM / DCS Rx Mode
H
L
L
L
VC2
L
H
L
L
VC3
L
L
H
L
3. FILTER
To convert Electromagnetic Field Wave to Acoustic Wave and then pass the specific frequency band.
- GSM FILTER (C220,C221,L204) ¡æ For filtering the frequency band between 925 ~ 960 MHz
- DCS FILTER (C218,C219,L203) ¡æ For filtering the frequency band 1805 and 1880 MHz.
- PCS SAW FILTER (F200) ¡æ For filtering the frequency band between 1930 and 1990 MHz
4. TC-VCXO (OSC100)
To generate the 13MHz reference clock to drive the logic and RF.
After additional process, the reference clock applies to the U100 Rx IQ demodulator and Tx IQ modulator.
The oscillator for RX IQ demodulator and Tx modulator are controlled by serial data to select channel and use fast lock
mode for GPRS high class operation.
5. SI 4205 (U100)
This chip integrates three differential-input LNAs.
The GSM input supports the E-GSM, DCS input supports the DCS1800, PCS input supports the PCS1900. The LNA
inputs are matched to the 200 ohm differential output SAW filters through eternal LC matching network.
Image-reject mixer downconverts the RF signal to a 100 KHz intermediate frequency(IF) with the RFLO from frequency
synthesizer. The RFLO frequency is between 1737.8 ~ 1989.9 MHz.
The Mixer output is amplified with an analog programmable gain amplifier(PGA), which is controlled by AGAIN.
The quadrature IF signal is digitized with high resolution A/D converts (ADC).
Also, this chip down-converts the ADC output to baseband with a digital 100 KHz quadrature LO signal. Digital
decimation and IIR filters perform channel selection to remove blocking and reference interface signals.
After channel selection, the digital output is scaled with a digital PGA, which is controlled with the DGAIN. DACs drive
a differential analog signal onto the RXIP, RXIN, RXQP, RXQN pins to interface to standard analog-input baseband IC.
2- 1
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