Samsung SGH-X460 Service Manual
GSM TELEPHONE
SGH-X460
SERVICE
Manual
GSM TELEPHONE 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
ELECTRONICS
his Service Manual is a property of Samsung Electronics Co.,Ltd.
ny unauthorized use of Manual can be punished under applicable
nternational and/or domestic law.
ⓒ
Samsung Electronics Co.,Ltd. May. 2004
Printed in Korea.
Code No.: GH68-05344A
BASIC.
1. SGH-X460 Specification
1. GSM General Specification
GSM900
Phase 1
Freq. Band[MHz]
Uplink/Downlink
ARFCN range 1~124
Tx/Rx spacing 45MHz 45MHz 95MHz
Mod. Bit rate/
Bit Period
Time Slot
Period/Frame Period
Modulation 0.3GMSK 0.3GMSK 0.3GMSK
MS Power 33dBm~13dBm 33dBm~5dBm 30dBm~0dBm
890~915
935~960
270.833kbps
3.692us
576.9us
4.615ms
EGSM 900
Phase 2
880~915
925~960
0~124 &
975~1023
270.833kbps
3.692us
576.9us
4.615ms
DCS1800
1710~1785
1805~1880
270.833kbps
Phase 1
512~885
3.692us
576.9us
4.615ms
Power Class 5pcl ~ 15pcl 5pcl ~ 19pcl 0pcl ~ 15pcl
Sensitivity -102dBm -102dBm -100dBm
TDMA Mux 8 8 8
Cell Radius 35Km 35Km 2Km
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Specification
2. GSM TX power class
TX Power
control level
5 33±2 dBm
6 31±2 dBm
7 29±2 dBm
8 27±2 dBm
9 25±2 dBm
10 23±2 dBm
11 21±2 dBm
GSM900
TX Power
DCS1800
control level
0 30±3 dBm
1 28±3 dBm
2 26±3 dBm
3 24±3 dBm
4 22±3 dBm
5 20±3 dBm
6 18±3 dBm
12 19±2 dBm
13 17±2 dBm
14 15±2 dBm
15 13±2 dBm
16 11±3 dBm
17 9±3dBm
18 7±3 dBm
19 5±3 dBm
7 16±3 dBm
8 14±3 dBm
9 12±4 dBm
10 10±4 dBm
11 8±4dBm
12 6±4 dBm
13 4±4 dBm
14 2±5 dBm
15 0±5 dBm
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2. SGH-X460 Circuit Description
Ⅰ. SGH-X460 RF Circuit Description
A. RX PART
1. ASM(U102)
→
Switching Tx, Rx path for GSM900, DCS1800 by logic controlling.
2. ASM Control Logic
→
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 (F100)
- DCS FILTER (F101)
→
For filtering the frequency band between 925 ~ 960 MHz
→
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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Circuit Description
B. TX PART
Baseband IQ signal fed into offset PLL, this function is included inside of U100 chip.
UAA3536 chip generates modulator signal which power level is about 1.5dBm and fed into
Power Amplifier(U105).
The PA output power and power ramping are well controlled by Auto Power Control circuit.
We use offset PLL below table.
GSM -35dBc
DCS -35dBc
GSM -66dBc
DCS -65dBc
GSM -75dBc
DCS -68dBc
Modulation Spectrum
200kHz offset
30 kHz bandwidth
400kHz offset
30 kHz bandwidth
600kHz ~ 1.8MHz offset
30 kHz bandwidth
Ⅱ. Baseband Circuit description of SGH-X460
A. PCF50601
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).
2. Backlight Brightness Modulator
The Backlight Brightness Modulator (BBM) contains a programmable Pulse-width 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-X460) use PWM.
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Circuit Description
3. Clock Generator
The Clock Generator (CG) generates all clocks for internal and external usage. The 32768 Hz
crystal oscillator provides an accurate low clock frequency for the PCF50601 and other circuitry.
B. Connector
1. LCD Connector
LCD is consisted of main LCD(color 65K UFB LCD) and small LCD(B/W). Chip select
signals, LCD_MAIN_CS and LCD_SUB_CS, can enable Each LCD. Backlight signal enables
white LED of main LCD and small LCD. "RESET_2V8" signal initiates the Reset process of
the LCD.
16-bit data lines(HD(0)~HD(15)) transfers data and commands to LCD through by pass
capacitor.
"SPK_P" and "SPK_N" from OM6357 are used for audio speaker. And "VDD_VIB" from
PCF50601 enables the motor.
2. Key
This is consisted of key interface pins among OM6357, KBIO(0:7). These signals compose the
matrix. Result of matrix informs the key status to key interface in the OM6357. Power on/off
key is separated from the matrix. So power on/off signal is connected with PCF50601 to enable
PCF50601. twelve key LED use the "VBAT" supply voltage. "VDD_KEY" signal enables
LEDs with current control. "FLIP" informs the status of folder (open or closed) to the OM6357.
This uses the hall effect IC, A3210ELH. A magnet under main LCD enables A3210ELH.
3. EMI ESD Filter
This system uses the EMI ESD filter, EMIF09 to protect noise from IF CONNECTOR part.
4. IF connetor
It is 24-pin connector. They are designed to use VBAT, V_EXT_CHARGE, TXD0, RXD0,
RTS0, CTS0, JIG_REC, CHARGER_OK, RXD1, TXD1, AUX_MIC, AUX_SPK and GND.
They connected to power supply IC, microprocessor and signal processor IC.
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Circuit Description
C. Battery Charge Management
A complete constant-current/constant-voltage linear charger for single cell lithium-ion batteries.
If TA connected to phone, "CHARGER_OK" enable charger IC and supply current to battery.
when fault condition caused, "CHG_ON" signal level change low to high and charger IC stop
charging process.
D. Audio
EARP_P and EARP_N from OM6357 are connected to the main speaker. AUXSP is connected to
the Hands free kit. MIC_P and MIC_N are connected to the main MIC. And AUX_MIC_P and
AUX_MIC_N are connected to the Hands free kit.
YMU762C is a LSI for portable telephone that is capable of playing high quality music by
utilizing FM synthesizer and ADPCM decoder that are included in this device.
As a synthesis, YMU762MA3 is equipped 32 voices with different tones. Since the device is
capable of simultaneously generating up to synchronous with the play of the FM synthesizer,
various sampled voices can be used as sound effects.
Since the play data of YMU762MA3 are interpreted at anytime through FIFO, the length of the
data(playing period) is not limited, so the device can flexibly support application such as incoming
call melody music distribution service. The hardware sequencer built in this device allows playing
of the complex music without giving excessive load to the CPU of the portable telephones.
Moreover, the registers of the FM synthesizer can be operated directly for real time sound
generation, allowing, for example, utilization of various sound effects when using the game
software installed in the portable telephone.
YMU762 includes a speaker amplifier with high ripple removal rate whose maximum output is
550mW (SPVDD=3.6V). The device is also equipped with conventional function including a
vibrator synchronous with music.
For the headphone, it is provided with a stereophonic output terminal.
For the purpose of enabling YMU762MA3 to demonstrate its full capabilities, Yamaha purpose to
use "SMAF:Synthetic music Mobile Application Format" as a data distribution format that is
compatible with multimedia.
Since the SMAF takes a structure that sets importance on the synchronization between sound and
images, various contents can be written into it including incoming call melody with words that can
be used for training karaoke, and commercial channel that combines texts, images and sounds, and
others.
The hardware sequencer of YMU762MA3 directly interprets and plays blocks relevant to synthesis
(playing music and reproducing ADPCM with FM synthesizer) that are included in data distributed
in SMAF.
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Circuit Description
E. Memory
Signals in the OM6357 enable two memories. They use only one volt supply voltage, VDD3 in
the PCF50601. This system uses Samsung's memory, KBB06A300M-T402. It is consisted of 128M
bits flash NOR memory and 128M bits flash NAND memory and 32M bits UtRAM. It has 16 bit
data line, HD[0~15] which is connected to OM6357. It has 23 bit address lines, HA[1~23].
CS_NAND and NCSRAM signals is chip select.
Writing process, HWR_N is low and it enables writing process to flash memory and SRAM.
During reading process, HRD_N is low and it enables reading process to flash memory and
SRAM. Each chip select signals in the OM6357 select memory among 2 flash memory and
UtRAM.
Reading or writing procedure is processed after HWR_N or HRD_N is enabled. Memories use
reset, which is VDD3 delay from PCF50601. HA[22] signal enables lower byte of SRAM and
HA[22] signal enables higher byte of SRAM.
F. OM6357
OM6357 is consisted of ARM core and DSP core. It has 8x1Kword on-chip program/data RAM,
55 Kwords on-chip program ROM in the DSP. It has 4K*32bits ROM and 2K*32bits RAM in the
ARM core. DSP is consisted of KBS, JTAG, EMI and UART. ARM core is consisted of EMI,
PIC(Programmable Interrupt Controller), reset/power/clock unit, DMA controller, TIC(Test Interface
Controller), eripheral bridge, PPI, SSI(Synchronous Serial Interface), ACC(Asynchronous
communications controllers), timer, ADC, RTC(Real-Time Clock) and keyboard interface.
KBIO(0:7), address lines of DSP core and HD[0~15]. HA[1~23], address lines of ARM core and
HD[0~15], data lines of ARM core are connected to memory, YMU762. MV317S(Camera DSP
Chip) controls the communication between ARM core and DSP core.
CS_NAND, NCSRAM, NCSFLASH in the ARM core are connected to each memory. HWR_N
and HRD_N control the process of memory. External IRQ(Interrupt Request) signals from each
units, such as, PMU need the compatible process.
KBIO[0~7] receive the status from key and RXD0/TXD0/IrDA_DOWN are used for the
communications using IRDA and data link cable(DEBUG_DTR/RTS/TXD/RXD/CTS/DSR).
It has JTAG control pins(TDI/TDO/TCK) for ARM core and DSP core. It receives 13MHz clock
in CKI pin from external TCXO. ADC(Analog to Digital Convertor) part receives the status of
temperature, battery type and battery voltage.
G. VC_TCXO-214C6(26MHz)
This system uses the 26MHz TCXO, VC_TCXO-214C6. AFC control signal from OM6357
controls frequency from 26MHz X-tal. The clock output frequency of UAA3536HN is 13MHz.
This clock is connected to OM6357, YMU762.
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3. SGH-X460 Exploded View and its Parts list
QMW01
1. Cellular phone Exploded View-1
QFU01
QLC67
QMO02
QFR01
QKP01
QMP01
QME02
QAN02
QVK01
QVO01
QSP04
QFL01
QCR04
QSC11
QSC12
QIF01
QRE01
QRF01
QCR04
QBA18
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2. Cellular phone Parts list
Exploded view and its Part list
Location
Description SEC CODE Remark
NO.
QFU01 FOLDER UPPER GH75-04524A
QLC67 LCD GH07-00564A
QSP04 SPEAKER 3001-001574
QMO02 MOTOR 3101-001315
QFL01 FOLDER LOWER GH75-04525A
QMW01 MAIN WINDOW LCD GH75-04528A
QFR01 FRONT COVER GH75-04523A
QVO01 VOLUME KEY GH75-04529A
QKP01 KEYPAD GH75-04527A
QMP01 MAIN PBA GH92-01799A
QVK01 VOL KEY FPCB GH59-01419A
QAN02 INTENNA GH42-00425A
QME02 METAL DOME GH59-01418A
QRE01 REAR COVER GH75-04526A
QIF01 IF COVER GH72-13265A
QRF01 RF COVER GH72-15078A
QCR04 SCREW 6001-001479
QBA18 BATTERY GH43-01418A
QSC11 FOLDER SCREW CAP R GH74-09038A
QSC12 FOLDER SCREW CAP L GH74-09039A
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Exploded view and its Part list
3. Test Jig (GH80-01909A)
3-1. RF Test Cable
(GH39-00261A)
3-4. Power Supply Cable
3-2. Test Cable
(GH39-00217A)
3-5. DATA CABLE
(GH39-00143B)
3-3. Serial Cable
3-6. TA
(GH44-00482A)
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