LG MG120a Manuel utilisateur

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Table of Contents

1. INTRODUCTION……………………………………………………………………………..P5

2. PERFORMANCE………………………………………………………………………….....P9

2.1 H/W Features…………………………………………………………………………......................P8

2.2 Technical Specification………………………………………………………………………….....P9

3. TECHNICAL BRIEF………………………………………………………….………….P15

3.1 MG120 Block Diagram………………………………………………………………………….....P15

3.2 RF Part Introductions………………………………………………………………………..........P16

3.3 Baseband Introductions……………………………………………………………………….….P21

4. TROUBLE SHOOTING………………………………………………….……………P33

4.1 RF Components…………………………………………………………………..…….................P34

4.2 RX Trouble………………………………………………………………………............................P35

4.3 TX Trouble………………………………………………………………………............................P41

4.4 Power On Trouble…………………………………………………………………………............P48

4.5 Charging Trouble………………………………………………………………………………..…P50

4.6 Vibrator Trouble………………………………………………………………………………........P52

4.7 LCD Trouble…………………………………………………………………………......................P54

4.8 Speaker Trouble…………………………………………………………………………...............P56

4.9 SIM Card Interface Trouble……………………………………………………………………….P58

4.10 Earphone Trouble……………………………………………………………………..…............P60

4.11 KEY backlight Trouble……………………………………………………………………….…..P62

4.12 Microphone Trouble…………………………………………………….………….………........P64

4.13 RTC Trouble……………………………………………………………….………......................P66

4.14 Folder on/off Trouble………………………………………………………………..……….......P68

5. Circuit and PCB Layout…………………………………………………………….P70

6. ENGINEERING MODE………………………………………….…………………….P77

7. STAND ALONE TEST……………………………………………………..…………..P78

8. CALIBRATION………………………………………………………………………………P81

9. Download…………………………………………………………….………………………...P89

10.Total ASSY……………………………………………………………………...…………….P94

11.Appendix

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1. INTRODUCTION

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1.1 Purpose

This manual provides the information necessary to repair, description and download the

features of this model.

1.2 Regulatory Information

A. Security

Toll fraud, the unauthorized use of telecommunications system by an unauthorized part (for example,

persons other than your company’s employees, agents, subcontractors, or person working on your

company’s behalf) can result in substantial additional charges for your telecommunications services.

System users are responsible for the security of own system. There are may be risks of toll fraud

associated with your telecommunications system. System users are responsible for programming and

configuring the equipment to prevent unauthorized use. The manufacturer does not warrant that this

product is immune from the above case but will prevent unauthorized use of common-carrier

telecommunication service of facilities accessed through or connected to it.

The manufacturer will not be responsible for any charges that result from such unauthorized use.

B. Incidence of Harm

If a telephone company determines that the equipment provided to customer is faulty and possibly

causing harm or interruption in service to the telephone network, it should disconnect telephone

service until repair can be done. A telephone company may temporarily disconnect service as long as

repair is not done.

C. Changes in Service

A local telephone company may make changes in its communications facilities or procedure. If these

changes could reasonably be expected to affect the use of the this phone or compatibility with the

network, the telephone company is required to give advanced written notice to the user, allowing the

user to take appropriate steps to maintain telephone service.

D. Maintenance Limitations

Maintenance limitations on this model must be performed only by the manufacturer or its authorized

agent. The user may not make any changes and/or repairs expect as specifically noted in this manual.

Therefore, note that unauthorized alternations or repair may affect the regulatory status of the system

and may void any remaining warranty.

1. INTRODUCTION

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1. INTRODUCTION

- 6-

E. Notice of Radiated Emissions

This model complies with rules regarding radiation and radio frequency emission as defined by local

regulatory agencies. In accordance with these agencies, you may be required to provide information

such as the following to the end user.

F. Pictures

The pictures in this manual are for illustrative purposes only; your actual hardware may look slightly

different.

G. Interference and Attenuation

Phone may interfere with sensitive laboratory equipment, medical equipment, etc.Interference from

unsuppressed engines or electric motors may cause problems.

H. Electrostatic Sensitive Devices

ATTENTION

Boards, which contain Electrostatic Sensitive Device (ESD), are indicated by the sign.

Following information is ESD handling:

• Service personnel should ground themselves by using a wrist strap when exchange system boards.

• When repairs are made to a system board, they should spread the floor with anti-static mat which is

also grounded.

• Use a suitable, grounded soldering iron.

• Keep sensitive parts in these protective packages until these are used.

• When returning system boards or parts like EEPROM to the factory, use the protective package as

described.

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1. INTRODUCTION

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1.3 Abbreviations

For the purposes of this manual, following abbreviations apply:

APC Automatic Power Control

BB Baseband

BER Bit Error Ratio

CC-CV Constant Current - Constant Voltage

DAC Digital to Analog Converter

DCS Digital Communication System

dBm dB relative to 1 milli watt

DSP Digital Signal Processing

EEPROM Electrical Erasable Programmable Read-Only Memory

ESD Electrostatic Discharge

FPCB Flexible Printed Circuit Board

GMSK Gaussian Minimum Shift Keying

GPIB General Purpose Interface Bus

GSM Global System for Mobile Communications

IPUI International Portable User Identity

IF Intermediate Frequency

LCD Liquid Crystal Display

LDO Low Drop Output

LED Light Emitting Diode

OPLL Offset Phase Locked Loop

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1. INTRODUCTION

- 8-

PAM Power Amplifier Module

PCB Printed Circuit Board

PGA Programmable Gain Amplifier

PLL Phase Locked Loop

PSTN Public Switched Telephone Network

RF Radio Frequency

RLR Receiving Loudness Rating

RMS Root Mean Square

RTC Real Time Clock

SAW Surface Acoustic Wave

SIM Subscriber Identity Module

SLR Sending Loudness Rating

SRAM Static Random Access Memory

PSRAM Pseudo SRAM

STMR Side Tone Masking Rating

TA Travel Adapter

TDD Time Division Duplex

TDMA Time Division Multiple Access

UART Universal Asynchronous Receiver/Transmitter

VCO Voltage Controlled Oscillator

VCTCXO Voltage Control Temperature Compensated Crystal Oscillator

WAP Wireless Application Protocol

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2. PERFORMANCE

2.1 H/W Features

Item Target Specification

Standard Battery Li-ion,830mAh

Stand by TIME Up to 200 hrs: Paging Period 9,RSSI 85dBm

Talk TIME Up to 200 min: GSM Tx Level 7()

Charging TIME Approx.2 hrs

RX Sensitivity GSM850: -109dBm,PCS: -109dBm

TX Output power GSM850:32.5dBm(Level 5),

PCS:29.5dBm(Level 0)

GPRS compatibility Class 10

SIM card type 3V

Display LCD:CSTN 128X128 65K,SubLCD 96X64

MONO

Status Indicator Hard Icons. Key Pad 0-9,#,*,Up/Down

Navigation Key, Menu Key, Clear Key Send

Key, END/PWR Key Soft Key (Left/Right)

ANT Internal

EAR Phone Jack Yes(MONO)

PC Synchronization No

Speech coding EFR/FR/HR

Data and Fax Yes

Vibrator Yes

Loud Speaker Yes

Voice Recoding No

Microphone Yes

Speaker/Receiver One way Speaker

Travel Adapter Yes

MIDI 40 Poly (Mono SPK)

Camera No

2. PERFORMANCE

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- 10 -

2.2 Technical Specification

Item Description Specification

Frequency Band

GSM850

TX:824.2MHz-848.8MHz

RX:869.2MHz-893.8MHz

CHN: 128-251

PCS

TX:1850.2MHz-1909.8MHz

RX:1930.2MHz-1989.8MHz

CHN: 512-810

2 Phase Error RMS<5 degrees

Peak<20 degrees

3 Frequency Error <0.1 ppm

GSM850

Level Power Toler Level Power Toler

5 33dBm ±2dB 13 17dBm

±3dB

6 31dBm ±3dB 14 15dBm

±3dB

7 29dBm ±3dB 15 13dBm

±3dB

8 27dBm ±3dB 16 11dBm

±5dB

9 25dBm ±3dB 17 9dBm

±5dB

10 23dBm ±3dB 18 7dBm

±5dB

11 21dBm ±3dB 19 5dBm

±5dB

12 19dBm ±3dB

PCS

Level Power Toler Level Power Toler

0 30dBm ±2dB 8 14dBm

±3dB

1 28dBm ±3dB 9 12dBm

±4dB

2 26dBm ±3dB 10 10dBm

±4dB

3 24dBm ±3dB 11 8dBm

±4dB

4 22dBm ±3dB 12 6dBm

±4dB

5 20dBm ±3dB 13 4dBm

±4dB

6 18dBm ±3dB 14 2dBm

±5dB

Power Level

7 16dBm ±3dB 15 0dBm

±5dB

2. PERFORMANCE

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