LG LG-510W User manual

GSM Phone
SERVICE MANUAL
MODEL : LG - 510W
SERVICE MANUAL MODEL : 510W

- 1 -
1. Introduction .............................................. 2
1.1 Purpose ................................................... 2
1.2 Regulatory Information ............................ 2
1.3 Abbreviations ........................................... 4
2. PERFORMANCE ..................................... 6
2.1 H/W Features .......................................... 6
2.2 Technical Specification ............................ 7
3. TECHNICAL BRIEF ............................. 11
3.1 Receiver ................................................ 11
3.2 Synthesizer ............................................ 14
3.3 Transmitter ............................................ 17
3.4 13MHz Clock ......................................... 21
3.5 Power Supplies and Control Signals ..... 21
3.6 Digital Main Processor .......................... 22
3.7 Analog Main Processor ......................... 25
3.8 Power Management .............................. 26
3.9 Memories ............................................... 28
3.10 Display and Interface ........................... 28
3.11 Keypad Switches and Scanning .......... 28
3.12 Microphone .......................................... 30
3.13 Earpiece .............................................. 30
3.14 Hands-free Interface ............................ 31
3.15 Buzzer Driver ....................................... 31
3.16 Key Back-light Illumination .................. 32
3.17 LCD Back-light Illumination ................. 32
4. TROUBLE SHOOTING ....................... 33
4.1 RX Trouble ............................................ 34
4.2 TX Trouble ............................................. 37
4.3 Power on Trouble .................................. 40
4.4 Charge Trouble ..................................... 42
4.5 LCD Trouble .......................................... 43
4.6 Receiver Trouble ................................... 44
4.7 Buzzer Trouble ...................................... 45
4.8 MIC Trouble ........................................... 46
4.9 Vibrator Trouble ..................................... 47
4.10 Indicator LED Trouble ......................... 48
4.11 Backlight LED Trouble ......................... 50
4.12 Folder on/off Trouble ........................... 51
4.13 SIM Detect Trouble ............................. 52
4.14 Earphone Trouble ................................ 53
4.15 HFK Trouble ........................................ 55
5. TEST POINT DATA .............................. 57
6. STAND ALONE TEST ......................... 74
6.1 Introduction ............................................ 74
6.2 Setting Method ...................................... 74
6.3 Means of Test ........................................ 74
7. AUTO CALIBRATION ......................... 75
7.1 Overview ............................................... 75
7.2 Requirements ........................................ 75
7.3 Menu and settings ................................. 75
7.4 AGC ....................................................... 77
7.5 APC ....................................................... 77
7.6 ADC ....................................................... 77
7.7 Setting ................................................... 77
7.8 How to do calibration ............................. 77
8. ASSEMBLY INSTRUCTION ............. 78
8.1 Disassembly .......................................... 78
8.2
Disassembly of Front Cover Components
... 81
8.3 Disassembly of Folder ........................... 83
9. BLOCK DIAGRAM ............................... 85
9.1 Main Board ............................................ 85
9.2 FPCB ..................................................... 86
9.3 RF .......................................................... 87
10. CIRCUIT DIAGRAM .............................89
10.1 BB Circuit ............................................ 89
10.2 RF Circuit ............................................ 90
11. PCB LAYOUT ........................................ 91
12.
DOWNLOAD AND CALIBRATION
...... 93
12.1 Download ............................................ 93
12.2 Calibration ............................................95
13. ENGINEERING MODE ...................... 98
13.1 BB Test [MENU 1] .......................... 98
13.2 RF Test [MENU 2] ........................ 100
13.3 MF Mode [MENU 3] ................... 100
13.4 Trace option [MENU 4] .............. 101
13.5 Call Timer [MENU 5] .................. 101
13.6 Fact. Reset [MENU 6] ................ 101
13.7 S/W version [MENU 7] ............... 101
14. EXPLODED VIEW .......................... 102
15. REPLACEMENT PARTS LIST ......104
Table Of Contents

1. Introduction
- 2 -
1. Introduction
1.1 Purpose
This manual provides the information necessary to repair, calibration, description and download the
features of the LG-510W.
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. LGE 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. LGE
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 LG-510W 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 the LG-510W must be performed only by the LGE 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
- 3 -
E. Notice of Radiated Emissions
The LG-510W 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
The LG-510W 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 Flash memory to the factory, use the protective
package as described.

1. Introduction
- 4 -
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
CLA Cigar Lighter Adapter
DAC Digital to Analog Converter
DCS Digital Communication System
dBm dB relative to 1 milliwatt
DSP Digital Signal Processing
EEPROM Electrical Erasable Programmable Read-Only Memory
EL Electroluminescence
ESD Electrostatic Discharge
FPCB Flexible Printed Circuit Board
GMSK Gaussian Minimum Shift Keying
GPIB General Purpose Interface Bus
GPRS General Packet Radio Service
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
LG-510W LG GSM Phone
LGE LG Electronics
OPLL Offset Phase Locked Loop
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
STMR1 Side Tone Masking Rating