Samsung Service Manual SGH-X460.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 - X4 6 0
S p e c if ic a t io n
1. GSM General Specification
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
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
1- 1
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Specification
2. GSM TX power class
TX Power
control level
5
GSM900
TX Power
control level
0
DCS1800
33¡¾2 dBm
30¡¾3 dBm
6
31¡¾2 dBm
1
28¡¾3 dBm
7
29¡¾2 dBm
2
26¡¾3 dBm
8
27¡¾2 dBm
3
24¡¾3 dBm
9
25¡¾2 dBm
4
22¡¾3 dBm
10
23¡¾2 dBm
5
20¡¾3 dBm
11
21¡¾2 dBm
6
18¡¾3 dBm
12
19¡¾2 dBm
7
16¡¾3 dBm
13
17¡¾2 dBm
8
14¡¾3 dBm
14
15¡¾2 dBm
9
12¡¾4 dBm
15
13¡¾2 dBm
10
10¡¾4 dBm
16
11¡¾3 dBm
11
8¡¾4dBm
17
9¡¾3dBm
12
6¡¾4 dBm
18
7¡¾ dBm
3
13
4¡¾4 dBm
19
5¡¾ dBm
3
14
2¡¾5 dBm
15
0¡¾5 dBm
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2 . SGH - X4 6 0
C ir c u it
D e s c r ip t io n
¥° . S G H - X 4 6 0 R F C i r c u i t D e s c r i p t i o n
A. RX PART
1. ASM(U102)
¡æ
Switching Tx, Rx path for GSM900, DCS1800 by logic controlling.
2. ASM Control Logic
¡æ
Truth Table
VC_1
GSM Tx Mode
DCS Tx Mode
GSM Rx Mode
DCS Rx Mode
H
L
L
L
VC_2
L
H
L
L
3. FILTER
To convert Electromagnetic Field Wave to Acoustic Wave and then pass the specific frequency
band.
- GSM FILTER (F100) ¡æ For filtering the frequency band between 925 ~ 960 MHz
- DCS FILTER (F101) ¡æ For filtering the frequency band 1805 and 1880 MHz.
4. VC-TCXO (OSC101)
To generate the 26MHz 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. UAA3536(U100)
This chip integrates two differential-input LNAs.
The GSM input supports the E-GSM, DCS input supports the DCS1800. The LNA inputs are
matched to the 150 ohm differential output SAW filters through external LC matching network.
Image-reject mixer downconverts the RF signal to a 100 KHz intermediate frequency(IF) with
the RFLO from OSC100 voltage-controlled oscillator. The RFLO frequency is between 1801 ~
1921 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).
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