lg_b2070_service_manual.pdf

Service Manual

B2070

Date: October, 2005 / Issue 1.0

P/N : MMBD0047201

Date : March 2005 / Issue 1.0

Service Manual

B2000

Table Of Contents

1. INTRODUCTION..........................2

1.1 Purpose ...........................................2

1.2 Regulatory Information ....................2

1.3 Abbreviations ..................................4

5. DOWNLOAD AND

CALIBRATION .......................91

5.1 Download .......................................91

5.2 Calibration .......................................96

2. PERFORMANCE ........................ 6

2.1 H/W Feature ...................................6

2.2 Technical Specification ..................8

6. BLOCK DIAGRAM.....................99

7. CIRCUIT DIAGRAM .................101

3. TECHNICAL BRIEF ..................13

3.1 Transceiver ...................................13

3.2 Power Amplifier Module ..................19

3.3 13 MHz Clock ............................... 20

3.4 Power Supplies of RF circuits ........20

3.5 Digital Main Processor ...................22

3.6 Analog Main & Power

Management Processor ................28

3.7 Display Interface ............................. 38

3.8 Radio Interface ..............................40

3.9 Keypad Switches and Scanning .... 41

3.10 Microphone ..................................42

3.11 Main Speaker ............................. 42

3.12 Headset interface ........................43

3.13 Key Back-light Illumination .......... 44

3.14 Vibrator ........................................45

8. PCB LAYOUT .........................106

9. ENGINEERING MODE .............109

9.1 BB Test [MENU 1] .........................110

9.2 RF Test [MENU 2] .........................111

9.3 MF mode [MENU 3].......................112

9.4 Trace option [MENU 4] ..................113

9.5 Call timer [MENU 5] ......................113

9.6 Fact. Reset [MENU 6] ...................113

9.7 S/W version [MENU 7] ..................113

10. STAND ALONE TEST.............114

10.1 Introduction ...............................114

10.2 Setting Method............................114

10.3 Means of Test ............................115

4. TROUBLE SHOOTING ............. 46

4.1 RX Trouble ................................... 46

4.2 TX Trouble ................................... 53

4.3 Power On Trouble .........................61

4.4 Charging Trouble........................... 63

4.5 Vibrator Trouble..............................65

4.6 LCD Trouble.................................. 67

4.7 Radio Trouble ................................69

4.8 Speaker Trouble .............................71

4.9 SIM card interface trouble ............ 74

4.10 Earphone Trouble .........................76

4.11 Key Backlight Trouble ..................78

4.12 Receiver Trouble ..........................80

4.13 Microphone Trouble .................... 82

4.14 RTC Trouble .................................84

4.15 Indication LED Trouble..................86

4.16 PTT Trouble .................................88

4.17 Speakerphone Trouble ..................89

11. AUTO CALIBRATION ...........117

11.1 Overview.....................................117

11.2 Requirements..............................117

11.3 Menu and Settings ......................117

11.4 AGC............................................119

11.5 APC ............................................119

11.6 ADC............................................119

11.7 Setting ........................................119

11.8 How to do calibration...................119

12. EXPLODED VIEW &

REPLACEMENT PART LIST ..121

12.1 Exploded View ............................121

12.2 Replacement Parts

<Mechanic component>...............123

<Main component>......................125

12.3 Accessory ....................................138

1. INTRODUCTION

1.1 Purpose

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

features of this model.

1.2 Regulatory Information

A. Security

To ll fraud, the unauthorized use of telecommunications system byan 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

Alocal 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.

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1. INTRODUCTION

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

systemboards.

• 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

1.3 Abbreviations

For the purposes of this manual, following abbreviations apply:

APC

Automatic Power Control

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

Intermediate Frequency

LCD

Liquid Crystal Display

LDO

Low Drop Output

LED

Light Emitting Diode

OPLL

Offset Phase Locked Loop

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