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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GF200 Service Manual

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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GF200 Service Manual

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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GF200 Service Manual

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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GF200 Service Manual

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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GF200 Service Manual

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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GF200 Service Manual

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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GF200 Service Manual

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

BURST STORE

DAC

ADC

VOICEBAND

SECTION

POWER

RAMPING RAM

AUXILI ARY

SECTION

BASEBAND SECTI ON

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

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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GF200 Service Manual

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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GF200 Service Manual

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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GF200 Service Manual

☞ 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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GF200 Service Manual

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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GF200 Service Manual

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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GF200 Service Manual

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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