Samsung Service Manual SGH-X600, Service Manual do Tel.komórkowych, Samsung - Service Manual
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SERVICE
Manual
1. GSM General Specification
G S M 9 0 0
P h as e 1
E G S M 9 0 0
P h as e 2
D C S 1 8 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 in 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
A R F C N r an g e
1 ~ 1 2 4
0 ~ 1 2 4 &
9 7 5 ~ 1 0 2 3
5 1 2 ~ 8 8 5
Tx / R x s p a c i n g
4 5 M H z
4 5 M H z
9 5 M H z
M o d . B it r a t e /
B i t P er io 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
Ti me S l o t
P e r i o d / F r a me P e r i o d
5 7 6 . 9 u s
4 .6 1 5 ms
5 7 6 . 9 u s
4 .6 1 5 ms
5 7 6 .9 u s
4 . 6 1 5 ms
M o d u l a t io n
0 .3 G M S K
0 .3 G M S K
0 .3 G M S K
M S P o w er
3 3 d B m~ 1 3 d Bm
3 3 d B m~ 5 d B m
3 0 d B m~ 0 d Bm
P o w e r C la s s
5 p c l ~ 1 5 p c l
5pcl ~ 19pcl
0pcl ~ 15pcl
S e n s i t i v i ty
- 1 0 2 d B m
- 1 0 2 d B m
- 1 0 0 d B m
T D M A M u x
8
8
8
C e ll R a d i u s
3 5 K m
3 5 K m
2 K m
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2. GSM TX power class
TX Power
control level
GSM900
TX Power
control level
DCS1800
5
33ꆾ2 dBm
0
30ꆾ3 dBm
6
31
ꆾ
2 dBm
1
28ꆾ3 dBm
7
29ꆾ2 dBm
2
26ꆾ3 dBm
8
27
ꆾ
2 dBm
3
24ꆾ3 dBm
9
25ꆾ2 dBm
4
22ꆾ3 dBm
10
23ꆾ2 dBm
5
20ꆾ3 dBm
11
21
ꆾ
2 dBm
6
18ꆾ3 dBm
12
19ꆾ2 dBm
7
16ꆾ3 dBm
13
17
ꆾ
2 dBm
8
14
ꆾ
3 dBm
14
15ꆾ2 dBm
9
12ꆾ4 dBm
15
13
ꆾ
2 dBm
10
10ꆾ4 dBm
16
11ꆾ3 dBm
11
8ꆾ4dBm
17
9ꆾ3dBm
12
6ꆾ4 dBm
18
7ꆾ3 dBm
13
4ꆾ4 dBm
19
5ꆾ3 dBm
14
2ꆾ5 dBm
15
0ꆾ5 dBm
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1. SGH-X600 RF Circuit Description
1) RX PART
1. ASM(U102) ꇦ Switching Tx, Rx path for GSM900, DCS1800 by logic controlling.
2. ASM Control Logic (Q100, Q101) ꇦ Truth Table
VC_1
VC_2
GSM Tx Mode
H
L
DCS Tx Mode
L
H
GSM Rx Mode
L
L
DCS Rx Mode
L
L
3. FILTER
To convert Electromagnetic Field Wave to Acoustic Wave and then pass the specific frequency band.
- GSM FILTER (F101)
ꇦ
For filtering the frequency band between 925 ~ 960 MHz
- DCS FILTER (F102)
ꇦ
For filtering the frequency band 1805 ~ 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 U103 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. Transceiver (U103)
The receiver front-end converts the aerial RF signal from EGSM, DCS bands down to a low intermediate frequency (IF)
of 100 kHz. The first stages are symmetrical low noise amplifiers (LNAs). They are matched to 50 ohm. The LNAs are
followed by an I,Q 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 interferers. 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 8dB gain steps in front of the filters.
2) TX PART
Baseband IQ signal fed into offset PLL, this function is included inside of U103 chip.
OSC100 chip generates modulator signal which power level is about 6.5dBm and fed into Power Amplifier(U101).
The PA output power and power ramping are well controlled by Auto Power Control circuit.
We use offset PLL below .
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GSM
-35dBc
200kHz offset
30 kHz bandwidth
DCS
-35dBc
PCS
-35dBc
GSM
-66dBc
Modulation Spectrum
400kHz offset
30 kHz bandwidth
DCS
-65dBc
PCS
-66dBc
GSM
-75dBc
600kHz ~ 1.8MHz offset
30 kHz bandwidth
DCS
-68dBc
PCS
-75dBc
2. Baseband Circuit description of SGH-X600
1. PCF50601
1.1. Power Management
Ten low-dropout regulators designed specifically for GSM applications power the terminal and help ensure optimal system
performance and long battery life. A programmable boost converter provides support for 1.8V, 3.0V, and 5.0V SIMs,
while a self-resetting, electronically fused switch supplies power to external accessories. Ancillary support functions, such
as RTC module and High Voltage Charge pump, Clock generator, aid in reducing both board area and system complexity.
I2C BUS serial interface provides access to control and configuration registers. This interface gives a microprocessor full
control of the PCF50601 and enables system designers to maximize both standby and talk times.
Supervisory functions. including a reset generator, an input voltage monitor, and a temperature sensor, support reliable
system design. These functions work together to ensure proper system behavior during start-up or in the event of a fault
condition(low microprocessor voltage, insufficient battery energy, or excessive die temperature).
1.2.
modulator (PWM) and FET
to modulate the intensity of a series of LED’s or to control a DC/DC converter that drives LCD backlight.
This phone (SGH-X600) is not use PWM, but use DC CONTROL (COLOR_LCD_BL)
So "COLOR_LCD_BL" voltage is high value, backlight brightness is bright and "COLOR_LCD_BL" voltage is low value,
backlight is gloomy .
1.3.
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