Pantech GF200 Service Manual
GF200 Service Manual GF200
GF200 Service Manual
(GSM Cellular Phone)
Pantech Co., Ltd., Korea
June 28, 2004
1st Edition
For Use by Authorized Service/Maintenance Personal Only
Documents to Receive This Addendum:
GF200 Maintenance/Repair/Operating Manual
GF200 Service Manual
CONTENTS
SECTION 1 INTRODUCTION .............................................................................................................3
1.1 INTRODUCTION..............................................................................................................................3
1.2 FREQUENCY ALLOCATION AND ITS USE ...........................................................................................3
1.3 ITEM NAME AND USE ..................................................................................................................... 4
1.4 CHARACTERISTICS ........................................................................................................................4
SECTION 2 ELECTRICAL SPECIFICATIONS....................................................................................5
2.1 GENERAL ......................................................................................................................................5
2.2 TRANSMITTER…………………………………………………………………………………………….5
2.3 RECEIVER…………………………………………………………………………………………………5
SECTION 3 OPERATION....................................................................................................................6
3.1 NAME OF EACH PART…..……………………………….…………………………………………………6
3.2.DISPLAY ..………………….…………………………….………………………………………………..7
3.3 KEYPAD …………………………………….………….………………………………………………..7
SECTION 4 THEORY OF OPERATION..............................................................................................8
4.1 LOGIC SECTION........................................................................................................................8
4.1.1 DC DISTRIBUTION AND REGULATION PART…………………………………………………………….8
4.1.2 LOGIC PART…………………………………………………………………………………………….8
4.1.2.1 SUMMARY…………………………………………………………………………………………….9
4.1.2.2 BASEBAND DIGITAL SIGNAL PROCESSING………………………………………………………….10
4.1.3 MEMORY PART………………………………………………………………………………………..12
4.1.4 NOTIFICATION PART..................................................................................................................13
4.1.5 KEY PAD PART .........................................................................................................................13
4.1.6 LCD MODULE(DISPLAY PART) ..................................................................................................13
4.2 RADIO TRANSCEIVER SECTION.....................................................................................................14
4.2.1 DC DISTRIBUTION AND REGULATION PART.................................................................................15
4.2.2 TRANSCEIVER PIN DESCRIPTION…………………………………………………….……….15
4.2.3 RECEIVE SECTION………………………………………………………………………………….…17
4.2.3.1 AN OVERVIEW OF RECEIVE SECTION ......................................................................................17
4.2.3.2 RECEIVER PART……………………………………………………………………………….……18
4.2.4 TRANSMIT SECTION ..................................................................................................................19
4.2.4.1 AN OVERVIEW OF TRANSMIT SECTION ....................................................................................19
4.2.4.2 TRANSMITTER PART...............................................................................................................20
4.2.5 OFFSET PLL……………………………………………………………………………….…………..22
4.2.5.1 AN OVERVIEW OF OFFSET PLL............................................................................................22
4.2.5.2 VCTCXO(VOLTAGE CONTROLLED TEMPERATURE COMPENSATED CRYSTAL OSCILLATOR):V801….23
SECTION 5 ALIGNMENT PROCEDURE..........................................................................................24
5.1 RECOMMENDED TEST EQUIPMENT ...............................................................................................24
5.2 CONNECTION OF TEST EQUIPMENT ..............................................................................................24
SECTION 6 EQUIPMENT REPAIR PROCEDURE ...........................................................................25
6.1 NO POWER ON WITH BATTERY APPLIED ..........................................................................................25
6.1.1 POWER CHECK.........................................................................................................................25
6.1.2 OSCILLATION CHECK ...............................................................................................................28
6.1.3 KEYPAD LED NOT IN OPERATION ...............................................................................................29
6.1.4 STATUS LED ..…………………………………………………………………………..……… …30
6.2 AUDIO PART(EARPIECE, HANDS FREE EARPHONE, MICROPHONE, HANDS FREE MIC)..................31
6.2.1 NO RECEIVING TONE HEARD (EARPIECE) .................................................................................31
6.2.2 SIDETONE NOT TRANSMITTED (MIC) ........................................................................................33
6.2.3 SIDETONE NOT TRANSMITTED (HANDS FREE MIC).....................................................................33
6.2.4 HOOK SWITCH NOT WORKING .................................................................................................34
6.2.5 MELODY NOT RINGING ............................................................................................................35
6.2.6 VIBRATOR NOT WORKING …………………………………………………………………...…37
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6.3 SIM CARD PART ……………………………………...…………………………………………….38
6.3.1 SIM ERROR ………………………………………………………………………………………….38
6.4 CHARGER PART……………………………………………………………………………………..39
6.4.1 CHARGING ERROR ………………………………..…………………………………………………39
6.5 CAMERA SENSOR PART… ………………………………………………………………………..41
6.5.1 CAMERA PREVIEW ERROR………..……………… …………..…………………….…………41
6.6 RF PART…………….………………………………………………………………………………… 43
6.6.1 TEST CONDITIONS………………………………………………………………… …………………43
6.6.2 POWER SUPPLY CHECK POINT……………………………………………………………………….44
6.6.3 POWER AMPLIFIER MODULE ………………………………………………………………………...46
6.6.4 VCTCXO...…………...………………………………………………………………………………..48
6.6.5 ANTENNA SWITCH MODULE……………………………………………………….…………………..49
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SECTION 1. Introduction
1.1 An Introduction of GSM Digital Cellular Mobile Communication System
GSM (Global System for Mobile communication) concluded that digital technology working in
the Time Division Multiple Access (TDMA) mode would provide the optimum solution for the
future system. Specifically , a TDMA system has the following advantage
► Offers a possibility of channel splitting and advanced speech cGF200g ,resulting in improved
spectrum efficiency.
► Allows considerable improvements to be made with regards to the protection of information.
The GSM system is basically designed as a combination of three major subsystem;
The network subsystem, the radio subsystem, and the operation support system.
The functional architecture of a GSM system can be divided into the Mobile Station (MS), the Base
Station (BS), and the Network Subsystem (NS). The MS is carried by the subscriber, the BS
subsystem controls the radio link with the MS and the NS performs the switching of calls between
the mobile and other fixed or mobile network users as well as mobility management. The MS and
the BS subsystem communicate across the Um interface also known as radio link
The specifications relating to MS are as follows:
TS 100 607-1 : Digital cellular telecommunication system(Phase2+)Mobile Station (MS) con
Formance specification Part1:Conformance specification
1.2 Frequency Allocation and Its Use
Transmit frequency band : 880 MHz ~ 915 MHz(For EGSM) , 1710 MHz ~ 1785 MHz(For DCS)
1850 MHz ~ 1910 MHz(For PCS1900)
Receive frequency band: 925 MHz ~ 960 MHz(For EGSM) , 1805 MHz ~ 1880 MHz(For DCS)
1930 MHz ~ 1990 MHz(For PCS1900)
Channel spacing : 200 KHz
ARFCN(Absolute Radio Frequency Channel Number) : 1~124 and 975~1023 (For EGSM),
512~885 (For DCS), 512~810 (For PCS1900).
Separation between Transmit and Receive channels [MHz] : EGSM ;45 MHz, DCS ;95 MHz,
PCS ;80
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1.3 Item Name and Usage
GF200, GSM digital cell phone, is supercompact, superlight mobile communication terminal for
personal use. It has a GSM 900MHz and DCS 1800MHz/PCS 1900MHz frequency band and
adopts GSM and DCS/PCS mode having excellent spectrum efficiency, economy, and portability.
This product is GSM Cellular type portable phone, adopting 1-cell Li-ion battery and power saving
circuit to maximize its operation time. Also, it is equipped with a fixed antenna and its color LCD with
font built in enables both Chinese and English text service. And power control(basic feature of GSM),
security feature, voice symbol feature, and variable data rate feature are used appropriately to
ensure its best performance. This product consists of a handset, battery pack, and Travel charger.
1.4 Characteristics
1) All the active devices of GF200 are made of semiconductors to ensure excellent performance
and semi-permanent use.
2) Surface mounting device (SMD) is used to ensure high reliability, compactness and lightness.
3) GF200 adopts the Silabs’s AERO RF transceiver, which is CMOS RF front-end for multi-band
GSM digital cellular handsets. The Aero's highly-integrated architecture eliminates the IF SAW
filter, low noise amplifiers (LNAs) for three bands, transmit and RF voltage-controlled oscillator
(VCO) modules, and more than 60 other discrete components found in conventional GSM
handsets to deliver smaller, more cost effective GSM solutions that are easier to design and
manufacture.
4) GF200 is designed to perform excellently even in the worst environment
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Section 2. Electrical Specifications
2.1 General E-GSM / DCS 1800/PCS1900
Mobile Transmit Frequency[MHz] 880 ~ 915 /1710 ~ 1785/ 1850 ~ 1910
Mobile Receive Frequency[MHz] 925 ~ 960 /1805 ~ 1880/ 1930 ~ 1990
Multiplex number 8
The Number of Channels 174 / 375 / 299
Channel Spacing 200 kHz
Power Supply Rechargeable Li-Ion Battery 3.7V/680mAh
Operating Temperature -10℃ ∼ +55℃
Dimension 81(H) ×41(W) ×22(D) mm
Weight 85 g
2.2 Transmitter E-GSM / DCS 1800/PCS1900
Maximum Output Power 33±2 / 30±2 dBm/30±2 dBm
Frequency Error ±90Hz/±180Hz/±190Hz
Phase Error RMS < 5°, PEAK < 20°
Minimum Output Power 5±5 / 0±5 dBm /0±5 dBm
Power Control 5~19(2 dB Step)/0~15(2 dB Step)/ 0~15(2 dB Step)/
Output RF Spectrum TS 100 910V6.2.0
Switching Transient TS 100 910V6.2.0
Intermodulation attenuation
Idle Mode
-57dBm 9KHz~880M/915MHz~1GHz
-59dBm 880MHz~915MHz
Conducted Spurious Emissions
-53dBm 1.7~1.785GHz
-47dBm 1~1.715GHz/1.785GHz~12.75GHz
Allocated Channel
-36dBm 9KHz~ 1GHz
-30dBm 1GHz~ 12.75GHz
2.3 Receiver
Reference Sensitivity
For Adjacent interference
For Adjacent(200KHz) interference
For Adjacent(400KHz) interference
For Adjacent(600KHz) interference
For GSM900 small MS :-102dBm
For DCS1800 class3 MS : -102dBm
C/Ic 9 dB
C/Ia1 -9 dB
C/Ia2 -41 dB
C/Ia3 -49 dB
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y
Section 3 Operation
3.1 Name of each part
Antenna
3D Sound
Speaker
Sub Display
Screen
Camera
Flash
CCD
Camera
Main Displa
Screen
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3.2 Display(Dual LCD)
Parameter Projected Actual (MAIN LCD)
Display Color TFT LCD with white LED back lighting
260k colors
European Character : (font size : 16×16) 6 lines x 16
characters
Chinese Character : (font size : 16×16) 6 lines × 7
characters
Driver TP020 (Topploy)
Module Dimen. 34(H) x 47.8(V) x 5.3(D)
View size 28.03(H) x 35.04(V)
Active Area 28.03(H) x 35.04(V)
Number of dots 128(H) x RGB(H) x 160(V)
Dot pitch 0.073mm(H) x 0.219mm(V)
Parameter Projected Actual (SUB LCD)
Display Color TFT LCD with white LED back lighting
Driver TP020 (Topploy)
Module Dimen. 34(H) x 47.8(V) x 5.3(D)
View size 19.01(W) x 23.76(H)
Active Area 19.01(W) x 23.76(H)
Number of dots 128(H) x RGB(H) x 160(V)
Dot pitch 0.0495mm(H) x 0.1485mm(V)
3.3 Keypad
Market Goal Projected Actual Comments
English
Keypad
260k colors
European Character : (font size : 7×15) 1 lines x 12
characters
Chinese Character : (font size : 16×16) 1 lines × 6
characters
0-9, *,#
Send (Color)
End/Pwr (Color)
Up (Melody), Down
(Phonebook), Left
(Organizer), Right
(SMS),CENTER(WA
P),
MENU, OK, CLR
Accessary,
* Key: Vib. Mode
# Key: Auto Lock
0/+Key: International
2 Volume Keys
1 Camera key
0-9, *,#
Send (Color)
End/Pwr (Color)
Up (Melody), Down
(Phonebook), Left
(Organizer), Right
(SMS),CENTER(WA
P),
MENU, OK, CLR
Accessary,
* Key: Vib. Mode
Meets Goal.
(Industrial design
sample required)
Meets Goal
Keys for VR and
Lock
International
Volume up/down
# Key: Auto Lock
0/+Key: International
2 Volume Keys
1 Camera key
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Section 4. Theory of Operation
4.1 Logic Section
4.1.1 DC Distribution and Regulation Part
Applying battery voltage and pressing “END” key on the key pad short-circuits “Ground” and “_
PowerON”. AD6535(U2) control that power manage regarding power on/off in handset
Pressing POWERKEY on the key pad is active on the handset.
This will turn on all the LDOs, when POWERKEY is held low. The power of RF Tx power amplifier is
supplied directly by the battery.
4.1.2 Logic part
UNIVERSAL
SYSTEM CONN.
INTERF ACE
JTAG
SIM
INTERF ACE
MEMORY
INTERF ACE
ACCESSORY
INTERF ACE
AD6526( GSM Processor )
USCRI
USCRX
USCRTX
USCCTS
USCRTS
TEST
INTERF ACE
SIMCARD
SIMDATA
SIMCLK
SIMRESET
SIMSUPPLY
FLASHPWD
ROMCS
RAMCS
GPCS
ADD[0: 23 ]
DATA[0 :1 5]
GPIO[0:9]
GPPWRCTL
DSP
CHANNEL
EQUALIZER
CHANNEL
EQUALIZER
SPEECH
CODEC
MCU
CONTROL
PROCESSOR
SYSTEM
SRAM
KEYPAD/
BACKLIGHT
INTERF ACE
LCDCTL
LCDRESET
DISPL AYCS
ADD0
DATA[8 :1 5]
RD
WR
VOICEBAND/
BASEBAND
CODEC
INTERF ACE
RADIO
INTERF ACE
AD6535( Anal og Baseband Codec)
FILTER
VOICEBAND
SERIAL
PORT
AUXILI ARY
SERIAL
PORT
BASEBAND
SERIAL
PORT
FILTER
FILTER
BURST
STORE
DAC
ADC
VOICEBAND
SECTION
POWER
RAMPING RAM
AUXILI ARY
SECTION
BASEBAND SECTI ON
FILTER
FILTER
GMSK
MODULATOR
I TRANSMIT
DAC
Q TRANSMI T
DAC
AFC
DAC
RAMP
DAC
AGC
DAC
AUX
DAC
I RECEI VE
Q RECEI VE
ADC
ADC
FILTER
FILTER
QRXP
QRXN
ITXP
ITXN
QTXP
QTXN
IRXP
IRXN
SPEAKER
MI C
RADIO INTERFACE
RADIO
DISPL AY
LSI
Image Capture
Device
CAMERA SENSOR
INTERFACE
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4.1.2.1 Summary
The logic part consists of AD6526 ARM7 microprocessor-combined GSM-ASIC, COMBO(flash
ROM & SRAM), AD6535 VBC Chip. AD6526 is GSM-ASIC chipset implemented for GSM terminal’s
system control and baseband digital signal processing.
Major parts used in the logic part are as follows:
1) AD6526 : U1, [ARM7 Processor Core + GSM Signal Processing] ASIC
2) AD6535 : U2, Analog Baseband Codec
3) COMBO MEMORY(Flash ROM : U3, 256Mbit Flash Memory + 64Mbit SRAM )
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4.1.2.2 Baseband Digital Signal Processing
AD6526 is a GSM core device containing ARM7 CPU core. AD6535 is 148 pin BGA package,
consisting of terminal chips. The function and characteristics of clock are as follows:
1) Complete single chip GSM Processor
2) Channel codec sub-system
• Channel coder and decoder
• Interleaver and Deinterleaver
• Encryption and Decryption
3) Control Processor Subsystem including
• Parallel and serial Display interface
• Keypad Interface
• SIM Interface
• Control of RADIO subsystem
• Real Time Clock with Alarm
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☞ Configuration by Function of AD6526
1 Microprocessor Core
AD6526 has a built-in ARM7 microprocessor core, including microprocessor interrupt controller,
timer/counter, and DMA controller. And besides, 32bit data path is included, and up to 8Mbyte
addressing is enabled and can be extended up to 16Mbyte. Although external clock should be
provided to operate the microprocessor, this core uses 13MHz VCTCXO to provide clock.
2 Input Clock
1) Main Clock(13 MHz):
This is the clock needed for the microprocessor built in AD6526 to operate.
2) VC-TCXO(13 MHz) , 32.768KHz Clock:
This is the system reference clock to control SLEEP mode.
This is the clock derived from 13MHz VC-TCXO clock, provided by RF part. It is the timing
reference clock for GSM signal processing.
3 DSP Subsystem
This is a GSM signal processing part in GSM mode, consisting of speech transcGF200g and
Channel equalization as follows:
1) Speech transcGF200g
In full rate, the DSP receives the speech data stream from VBC and encodes data from 104kbps to
13kbps. Using algorithm is Regular Pulse Excitation with Long Term Prediction (RPE-LTP).
2) Equalization
The Equalizer recovers and demodulates the received signal
The Equalizer establishes local timing and frequency references for mobile terminal as well as
RSSI calculation.
The equlization algorithm is a version of Maximum Likelihood Sequency Estimation(MLSI)
using Viterbi Algorithm.
☞ GSM Core and RF Interface
1) Transmitter:
AD6535 VBC receive data at 270kbps and use an on chip lock-up table to perform GMSK
modulation. A pair of 10bit matched differential DACs convert the modulated data and pass
I and Q analog data to the transmit section of the radio system.
2) Receiver:
The receiver I and Q signals are sampled by a pair of ADCs at 270kbps.
The I and Q samples are transferred to the EGSMP through a dedicated receive path serial port.
4 RF Interface
This interfaces the RF part to control power amplifier, Tx LO buffer amplifier, VC-TCXO, and
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AGC-end on transmit/receive paths in the RF part.
1) Transmitter Interface:
This transmits TX_AGC signal to Tx AGC amplifier to adjust transmit power level and sends
Ramp_DAC signal to the RF part to control power amplifier.
2) Receiver Interface:
This transmits RX_AGC signal to Rx AGC amp. to adjust receive path gain.
5 General Purpose ADC Support
The AD6535 includes a general purpose 10bit auxiliary ADC with four multiplexed input channel
These are used for measurment of battery voltage ID , temperature and accessory ID.
6 USC(Universal System Connector) Interface
A Typical GSM handset requires serial connections to provide data during normal phone operation
manufacturing,testing and debugging.
7 General Purpose Interface
The AD6526 provides 32 interface pin for control of peripheral devices.
All GPIO pins start up as inputs. Additional purpose inputs and outputs are available under SW
control.
8 Speech TranscGF200g
In full rate mode, the DSP receive the speech data stream from the VBC and encodes data from
104kbps to 13kbps.Using algorithm is Regular Pulse Exitation with Long Term Prediction as
specified GSM Recommandation
9 Power Down Control Section
1) Idle Mode Control:
If IDLE/ signal turns ‘Low’, transmitter section becomes disabled.
2) Sleep Mode Control:
If IDLE/ and SLEEP/ signals turn ‘Low’, all the sections except for VC-TCXO circuit become
disabled.
3) Receiver & Transmitter Mode Control:
If IDLE/ and SLEEP/ signals turn ‘High’, all the sections become enabled to perform
transmit/receive operation.
4.1.3 Memory Part
Memory consists of COMBO (flash ROM & SRAM).
1 Flash ROM
Flash ROM has a capacity of 256Mbit(32MByte). The main programs of the terminal(call processing,
user interface, and diagnostic task) and supplemental programs (NAM program and test program)
are stored in the flash ROM. Even if the program version may be changed in the future, customers
can download the program.
2 Static RAM
SRAM has a capacity of 64Mbit(8MByte) and stores system parameters, data buffer, and stack of
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each task in it.
3 Key Tone Generation
All alert signals are generated by the DSP and output to the EVBC.
These alert can be used for the earpiece.
4.1.4 Notification Part
The notification of incoming call is given by melody, vibrator, and 7-Color LED.
1) Melody:
This is a device sounding alert/melody tones.
The melody datas are stored in flash memory (U3) And generated by Melody IC(U4).
2) Vibrator:
This is a device enabling vibration. The vibrator data is stored in flash memory(U3)
And generated by 19pin of Melody IC(U4).
3) 7-color LED:
This is a device to indicate a notification mode.
Q4,Q5 drives the lamp to flash.
4.1.5 Key Pad Part
To enable key operation to input information, the key matrix is configured using strobe signal of
KEYPADROW(0-4) and 5 input ports of KEYPADCOL(0-4). Also, to use the key even at light, the
backlight circuit is provided for LED 16s.
4.1.6 LCD Module(Display Part)
LCD module consists of LCD, controller, LED-Backlight, and LCD reflector.using dual LCD
Main LCD: 1S/W Icon x 1 lines[(128x3)x160] can be displayed on the LCD panel. 6 icons could be
provided by S/W. Controller with English font built in has been used.
Sub LCD: 1S/W Icon x 1 lines[(128x3)x160] can be displayed on the LCD panel. 6 icons are
provided. Controller with English font built in has been used.
LED-backlight Using illuminates the LCD panel, and LCD reflector enhances LCD display effect.
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4.2 Radio Transceiver Section
Fig.4-1. RF Transceiver block diagram
The GF200’s RF Transceiver, which is AEROI(SI4205) transceiver is the industry’s most
integrated
RF front end for multi-band GSM/GPRS digital cellular handsets and wireless data modems.
The highly integrated solution eliminates the IF SAW filter, external low noise amplifiers (LNAs)
for three bands, transmit and RF voltage controlled oscillator (VCO) modules, and more than 70
other discrete components found in conventional designs. The receive section uses a digital low-IF
architecture that avoids the difficulties associated with direct conversion while delivering lower
solution cost and reduced complexity. The baseband interface is compatible with any supplier’s
baseband subsystem. The transmit section is a complete up-conversion path from the baseband
subsystem to the power amplifier, and uses an offset phase-locked loop (PLL) with a fully integrated
transmit VCO. The frequency synthesizer uses Silicon Laboratories’ proven technology, which
includes integrated RF and IF VCOs, varactors, and loop filters.The unique integer-N PLL
architecture produces a transient response that is superior in speed to fractional-N architectures
without suffering the high phase noise or spurious modulation effects often associated with those
designs. This fast transient response makes the AEROI(SI4205) transceiver well suited to GPRS
multi-slot applications where channel switching and settling times are critical.
The following Figure shows of RF Transceiver PCB Layout
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