LG_VS750 SVC_Manual_100405.pdf

VS750

1. Introduction

1.1. Purpose

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

features of this model.

1.2. RegulatoryInformation

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 phones or compatibility with the net

work, 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 the phones 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.

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

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

VS750

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.

VS750 Product SPEC

VS750

Product Requirement SPEC.

Feb., 26, 2010

(RevA.0)

LG Electronics Inc.

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Table of Contents

VS750

VS750 Product SPEC........................ 1

Calibration & RF Auto Test

Program (Tachyon)......................... 85

2. Supporting Standard................................. 3

3. Functions of Major Semi-Conductors ....... 3

4. HW Features ............................................ 4

1. Configuration of Tachyon ....................... 86

1.1 Configuration of directory............... 86

5. SW Features............................................. 6

6. VS750 Figures.......................................... 9

1.2 Description of basic folders............ 87

1.3 Description of configuration files .... 87

2. How to use Tachyon............................... 88

GSM/ UMTS TECHNICAL BRIEF.... 10

2.1 Model selection .............................. 88

1.1. GENERAL DESCRIPTION.................. 10

2.2 Start cal & auto .............................. 90

1.2. GSM MODE......................................... 11

1.3. UMTS MODE....................................... 13

1.4. LO GENERATION and DISTRIBUTION

Main PCB Component List............. 92

FPCB Main Component List ........ 113

CIRCUIT .............................................. 16

1.5. OFF-CHIP RF COMPONENTS ........... 17

3 Key Component List.................. 114

TROUBLE SHOOTING .................... 21

1.1 RF Component ..................................... 21

1.2 SIGNAL PATH...................................... 23

1.3 Checking TCXO Block.......................... 26

1.4 Checking FEM Block ............................ 28

1.5 Checking WCDMA Block...................... 31

1.6 Checking GSM Block............................ 43

System HW Block Diagram............ 52

System RF Block Diagram ............. 53

System HW Block Diagram............ 54

VS750 REV 1.0 Schematic.............. 57

BGA Pin Map ................................... 77

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VS750 Product SPEC

VS750 : WCDMA1900/850/2100 + EGSM/GSM850/DCS/PCS +

US Cellular/US PCS + GPS

(HSDPA / GPRS / EDGE) (EVDO Rev_0 / EVDO Rev_A)

2. Supporting Standard

Supporting

Standard

WCDMA(FDD1,2,5)

EGSM/GSM850/DCS1800/PCS1900

US Cellular / US PCS

GPS

Frequency Range

WCDMA(FDD1) TX : 1920 – 1980 MHz

WCDMA(FDD1) RX : 2110 – 2170 MHz

WCDMA(FDD2) TX : 1850 – 1910 MHz

WCDMA(FDD2) RX : 1930 – 1990 MHz

WCDMA(FDD5) TX : 824 – 849 MHz

WCDMA(FDD5) RX : 849 – 894 MHz

EGSM TX : 880 – 915 MHz

EGSM RX : 925 – 960 MHz

GSM850 TX : 824 – 849 MHz

GSM850 RX : 869 – 894 MHz

DCS1800 TX : 1710 – 1785 MHz

DCS1800 RX : 1805 – 1880 MHz

PCS1900 TX : 1850 – 1910 MHz

PCS1900 RX : 1930 – 1990 MHz

US Cellular TX : 824.82 ~ 848.19 MHz

US Cellular RX : 869.82~893.19 MHz

US PCS TX : 1850~1910 MHz

US PCS RX : 1930~1990 MHz

GPS : 1575.42 MHz

3. Functions of Major Semi-Conductors

QSD8650

Terminal operation control and digital signal processing

Memory

(H8BES0UQ0MCR-46M)

NAND Flash Memory (4G) + SDRAM (2G)

Storing of terminal operation program

RTR6500/ RTR6285

Converts Rx and Tx RF signal to baseband signal

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