Samsung SGH-X640 service manual, samsung service manuals schematy serwisowki
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SAMSUNG Anycall
SGH-X640
SAMSUNG Anycall
CONTENTS
1. Specification
2. Circuit Description
3. Exploded Views and Parts List
4. Electrical Parts List
5. Block Diagrams
6. PCB Diagrams
7. Flow Chart of Troubleshooting
This Service Manual is a property of Samsung Electronics Co.,Ltd.
Any unauthorized use of Manual can be punished under applicable
International and/or domestic law.
ⓒ
Samsung Electronics Co.,Ltd. March. 2005
PrintedinKorea.
Code No.: GH68-06819A
BASIC.
1. GSM General Specification
G S M 9 0 0
P h a s e 1
E G S M 9 0 0
P h a s e 2
D C S 1 8 0 0
P h a s e 1
P C 1 9 0 0
P h a s e 1
F r e q . B a n d [ M H z ]
U p l i n k / D o w n l i n k
8 9 0 ~ 9 1 5
9 3 5 ~ 9 6 0
8 8 0 ~ 9 1 5
9 2 5 ~ 9 6 0
1 7 1 0 ~ 1 7 8 5
1 8 0 5 ~ 1 8 8 0
1 8 5 0 ~ 1 9 1 0
1 9 3 0 ~ 1 9 9 0
A R F C N r a n g e
1 ~ 1 2 4
0 ~ 1 2 4 &
9 7 5 ~ 1 0 2 3
5 1 2 ~ 8 8 5
5 1 2 ~ 8 1 0
T x / R x s p a c i n g
4 5 M H z
4 5 M H z
9 5 M H z
8 0 M H z
M o d . B i t r a t e /
B i t P e r i o d
2 7 0 . 8 3 3 k b p s
3 . 6 9 2 u s
2 7 0 . 8 3 3 k b p s
3 . 6 9 2 u s
2 7 0 . 8 3 3 k b p s
3 . 6 9 2 u s
2 7 0 . 8 3 3 k b p s
3 . 6 9 2 u s
T i m e S l o t
P e r i o d / F r a m e P e r i o d
5 7 6 . 9 u s
4 . 6 1 5 m s
5 7 6 . 9 u s
4 . 6 1 5 m s
5 7 6 . 9 u s
4 . 6 1 5 m s
5 7 6 . 9 u s
4 . 6 1 5 m s
M o d u l a t i o n
0 . 3 G M S K
0 . 3 G M S K
0 . 3 G M S K
0 . 3 G M S K
M S P o w e r
3 3 d B m ~ 1 3 d B m
3 3 d B m ~ 5 d B m
3 0 d B m ~ 0 d B m
3 0 d B m ~ 0 d B m
P o w e r C l a s s
5 p c l ~ 1 5 p c l
5pcl ~ 19pcl
0pcl ~ 15pcl
0pcl ~ 15pcl
S e n s i t i v i t y
- 1 0 2 d B m
- 1 0 2 d B m
- 1 0 0 d B m
- 1 0 0 d B m
T D M A M u x
8
8
8
8
C e l l R a d i u s
3 5 K m
3 5 K m
2 K m
2 K m
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2. GSM TX power class
TX Power
control level
GSM900
TX Power
control level
DCS1800
TX Power
control level
PCS1900
5
33ꆾ2 dBm
0
30ꆾ3 dBm
0
30ꆾ3 dBm
6
31
ꆾ
2 dBm
1
28ꆾ3 dBm
1
28ꆾ3 dBm
7
29ꆾ2 dBm
2
26
ꆾ
3 dBm
2
26
ꆾ
3 dBm
8
27ꆾ2 dBm
3
24ꆾ3 dBm
3
24ꆾ3 dBm
9
25ꆾ2 dBm
4
22ꆾ3 dBm
4
22ꆾ3 dBm
10
23ꆾ2 dBm
5
20ꆾ3 dBm
5
20ꆾ3 dBm
11
21
ꆾ
2 dBm
6
18
ꆾ
3 dBm
6
18
ꆾ
3 dBm
12
19ꆾ2 dBm
7
16ꆾ3 dBm
7
16ꆾ3 dBm
13
17
ꆾ
2 dBm
8
14
ꆾ
3 dBm
8
14
ꆾ
3 dBm
14
15ꆾ2 dBm
9
12ꆾ4 dBm
9
12ꆾ4 dBm
15
13
ꆾ
2 dBm
10
10
ꆾ
4 dBm
10
10
ꆾ
4 dBm
16
11ꆾ3 dBm
11
8
ꆾ
4dBm
11
8ꆾ4dBm
17
9
ꆾ
3dBm
12
6ꆾ4 dBm
12
6ꆾ4 dBm
18
7ꆾ3 dBm
13
4
ꆾ
4 dBm
13
4ꆾ4 dBm
19
5ꆾ3 dBm
14
2ꆾ5 dBm
14
2ꆾ5 dBm
15
0
ꆾ
5 dBm
15
0
ꆾ
5 dBm
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X640
1) RX PART
1. ASM(U103) ꇦ Switching Tx, Rx path for GSM900, DCS1800, PCS1900 by logic controlling.
2. ASM Control Logic (U103) ꇦ Truth Table
VC1
VC2
VC3
GSM Tx Mode
H
L
L
DCS Tx Mode
L
H
L
PCS Tx Mode
H
L
L
GSM Rx Mode
L
L
L
DCS Rx Mode
L
L
L
PCS Rx Mode
L
L
H
3. FILTER
To convert Electromagnetic Field Wave to Acoustic Wave and then pass the specific frequency band.
- GSM FILTER (F100)
ꇦ
For filtering the frequency band between 925 and 960 MHz
- DCS FILTER (F102)
ꇦ
For filtering the frequency band between 1805 and 1880 MHz.
- PCS FILTER (F101)
ꇦ
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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