Samsung SGH-X640 service manual.pdf

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SAMSUNG Anycall
SGH-X640
SAMSUNG Anycall
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7.
CONTENTS
Specification
Circuit Description
Exploded Views and Parts List
Electrical Parts List
Block Diagrams
PCB Diagrams
Flow Chart of Troubleshooting
ⓒ
Samsung Electronics Co.,Ltd. March. 2005
This Service Manual is a property of Samsung Electronics Co.,Ltd.
Any unauthorized use of Manual can be punished under applicable
Printed in Korea.
International and/or domestic law.
Code No.: GH68-06819A
BASIC.
1 . 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
P C1 9 0 0
P h as e 1
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 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
TX Power
control level
PCS1900
33¡¾2 dBm
30¡¾3 dBm
0
30¡¾3 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 . C ir c u it
1 . SG H -
D e s c r ip t io n
X640 RF Circuit De s cription
1) RX PART
1. ASM(U103) ¡æ Switching Tx, Rx path for GSM900, DCS1800, PCS1900 by logic controlling.
2. ASM Control Logic (U103)
¡æ Truth Table
VC1
GSM Tx Mode
DCS Tx Mode
PCS Tx Mode
GSM Rx Mode
DCS Rx Mode
PCS Rx Mode
H
L
H
L
L
L
VC2
L
H
L
L
L
L
VC3
L
L
L
L
L
H
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 and 960 MHz
- DCS FILTER (F102) ¡æ For filtering the frequency band between 1805 and 1880 MHz.
- PCS FILTER (F101) ¡æ For filtering the frequency band between 1930 and 1990 MHz.
4. VC-TCXO (OSC100)
This module generates the 26MHz reference clock to drive the logic and RF. After division by two a reference clock of
13MHz is supplied to the other parts of the system through the pin CLKOUT. After additional process, the reference
clock applies to the U100 Rx IQ demodulator and Tx IQ modulator. And then, the oscillator is controlled by serial data
to select channel and use fast lock mode for GPRS high class operation.
5. Transceiver (U100)
The receiver front-end which amplifies the GSM, DCS aerial signal, converts the chosen channel down to a low IF signal
of 100 kHz. The first stages are symmetrical low noise amplifiers (LNAs). The LNAs are followed by an IQ down mixer.
It consists of two mixers in parallel but driven by quadrature out of phase LO signals. The In phase (I) and Quadrature
phase (Q) IF signals are low pass filtered to provide protection from high frequency offset interferes. The low IF I and Q
signals are then fed into the channel filter. The front-end low IF I and Q outputs enter the integrated bandpass channel
filter with provision for five 8 dB gain steps in front of the filter.
2) TX PART
I and Q baseband signals are applied to the IQ modulator that shifts the modulation spectrum up to the transmit IF. It is
designed for low harmonic distortion, low carrier leakage and high image rejection to keep the phase error as small as
possible.
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