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
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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
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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
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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
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

1. Introduction
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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

2. PERFORMANCE
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2. PERFORMANCE
2.1 H/W Features
Item Feature
Li-Polymer, 630 mAh
Standard Battery Size: 44 68.6 5.6 mm
Weight: 22 g
Li-Ion, 940 mAh
Extended Battery Size: 44 68.6 8.7 mm
Weight: 32 g
AVG TCVR Current GSM , EGSM: 243 mA, DCS: 209 mA
Stand by Current < 3 mA
Talk time 2.7 hours (GSM TX Level 7)
Stand by time 200 hours (Paging Period:9, RSSI: -85 dBm)
Charging time 2 hours
RX Sensitivity GSM, EGSM: -108 dBm, DCS: -107 dBm
TX output power GSM, EGSM: 32 dBm (Level 5)
DCS: 29.5 dBm (Level 0)
GPRS compatibility No
SIM card type 3V only
Display 128 128 dots LCD (4 Gray color)
Soft icons
Key Pad
Status Indicator 0 ~ 9, #, *, Navigation Key, Up/Down Side Key
Side Key, Confirm Key, Record Key
Send Key, END/PWR Key
Antenna External
EAR Phone Jack Using I/O connector
PC Synchronization Yes
Speech coding EFR/FR
Data and Fax Yes
Vibrator Yes
Buzzer Yes
Voice Recoding Yes
C-Mike Yes
Receiver Yes
Travel Adapter Yes
Options Hands-free kit, CLA, Data Kit

2. PERFORMANCE
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2.2 Technical Specification
Item Description Specification
GSM
TX: 890 + n 0.2 MHz
RX: 935 + n 0.2 MHz (n = 1 ~ 124)
EGSM
1 Frequency Band TX: 890 + (n – 1024) 0.2 MHz
RX: 935 + (n – 1024) 0.2 MHz (n = 975 ~ 1024)
DCS
TX: 1710 + (n – 512) 0.2 MHz
Rx: 1805 + (n – 512) 0.2 MHz (n = 512 ~ 885)
2 Phase Error RMS < 5 degrees
Peak < 20 degrees
3 Frequency Error < 0.1 ppm
GSM, EGSM
Level Power Toler. Level Power Toler.
5 33 dBm 2dB 13 17 dBm 3dB
6 31 dBm 3dB 14 15 dBm 3dB
7 29 dBm 3dB 15 13 dBm 3dB
8 27 dBm 3dB 16 11 dBm 5dB
9 25 dBm 3dB 17 9 dBm 5dB
10 23 dBm 3dB 18 7 dBm 5dB
11 21 dBm 3dB 19 5 dBm 5dB
4 Power Level 12 19 dBm 3dB
DCS
Level Power Toler. Level Power Toler.
0 30 dBm 2dB 8 14 dBm 3dB
1 28 dBm 3dB 9 12 dBm 4dB
2 26 dBm 3dB 10 10 dBm 4dB
3 24 dBm 3dB 11 8 dBm 4dB
4 22 dBm 3dB 12 6 dBm 4dB
5 20 dBm 3dB 13 4 dBm 4dB
6 18 dBm 3dB 14 2 dBm 5dB
7 16 dBm 3dB 15 0 dBm 5dB

2. PERFORMANCE
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Item Description Specification
GSM, EGSM
Offset from Carrier (kHz). Max. dBc
100 +0.5
200 -30
250 -33
400 -60
600 ~ 1,200 -60
1,200 ~ 1,800 -60
1,800 ~ 3,000 -63
3,000 ~ 6,000 -65
5 Output RF Spectrum 6,000 -71
(due to modulation) DCS
Offset from Carrier (kHz). Max. dBc
100 +0.5
200 -30
250 -33
400 -60
600 ~ 1,200 -60
1,200 ~ 1,800 -60
1,800 ~ 3,000 -65
3,000 ~ 6,000 -65
6,000 -73
GSM, EGSM
Offset from Carrier (kHz) Max. (dBm)
400 -19
600 -21
1,200 -21
6 Output RF Spectrum 1,800 -24
(due to switching transient) DCS
Offset from Carrier (kHz) Max. (dBm)
400 -22
600 -24
1,200 -24
1,800 -27
7 Spurious Emissions Conduction, Emission Status
Conduction, Emission Status

2. PERFORMANCE
- 9 -
Item Description Specification
GSM, EGSM
8 Bit Error Ratio BER (Class II) < 2.439% @-102 dBm
DCS
BER (Class II) < 2.439% @-100 dBm
9 RX Level Report Accuracy 3 dB
10 SLR 8 3 dB
Frequency (Hz) Max.(dB) Min.(dB)
100 -12 -
200 0 -
300 0 -12
11 Sending Response 1,000 0 -6
2,000 4 -6
3,000 4 -6
3,400 4 -9
4,000 0 -
12 RLR 2 3 dB
Frequency (Hz) Max.(dB) Min.(dB)
100 -12 -
200 0 -
300 2 -7
500 *-5
13 Receiving Response 1,000 0 -5
3,000 2 -5
3,400 2 -10
4,000 2
* Mean that Adopt a straight line in between 300 Hz
and 1,000 Hz to be Max. level in the range.
14 STMR 13 5 dB
15 Stability Margin > 6 dB
dB to ARL (dB) Level Ratio (dB)
-35 17.5
-30 22.5
16 Distortion -20 30.7
-10 33.3
0 33.7
7 31.7
10 25.5
17 Side tone Distortion Three stage distortion < 10%
18 System frequency (13 MHz) tolerance ≤2.5 ppm

2. PERFORMANCE
- 10 -
Item Description Specification
19 32.768KHz tolerance ≤30 ppm
Full power
< 243 mA (GSM, EGSM) ; < 209 mA (DCS)
20 Power Consumption Standby
- Normal ≤3 mA (Max. power)
- Using Test mode on DSP Sleep function ≤6 mA
21 Talk Time GSM/ Level 7 (Battery Capacity 630mA): 162 Min
GSM/ Level 12 (Battery Capacity 630mA): 240 Min
Under conditions, at least 200 hours:
1. Brand new and full 630mAh battery
2. Full charge, no receive/send and keep GSM in idle
22 Standby Time mode.
3. Broadcast set off.
4. Signal strength display set at 3 level above.
5. Backlight of phone set off.
At least 80 dB under below conditions:
23 Ringer Volume 1. Ringer set as ringer.
2. Test distance set as 50 cm
24 Charge Voltage Fast Charge : < 500 mA
Slow Charge: < 60 mA
Antenna Bar Number Power
5 -85 dBm ~
4 -90 dBm ~ -86 dBm
25 Antenna Display 3 -95 dBm ~ -91 dBm
2 -100 dBm ~ -96 dBm
1 -105 dBm ~ -101 dBm
0 ~ -105 dBm
Batter Bar Number Voltage
0 ~ 3.62 V
26 Battery Indicator 1 3.62 ~ 3.73 V
2 3.73 ~ 3.82 V
3 3.82 V ~
27 Low Voltage Warning 3.5 0.03 V (Standby)
3.62 0.03 V (Call)
28 Forced shut down Voltage 3.35 0.03 V
1 Li-Polymer Battery
29 Battery Type Standard Voltage = 3.7 V
Battery full charge voltage = 4.2 V
Capacity: 630 mAh
Switching-mode charger
30 Travel Charger Input: 100 ~ 240 V, 50/60 Hz
Out put: 5.2 V, 600 mA

6. STAND ALONE TEST
- 74 -
6. STAND ALONE TEST
6.1 Introduction
This manual explains how to examine the status of RX and TX of 510W model.
A. Tx Test
TX test- this is to see if the transmitter of LG-510W is activating normally
B. Rx Test
RX test- this is to see if the receiver of LG-510W is activating normally.
6.2 Setting Method
A. COM port
a. Move your mouse on the “Connect”button, then click the right button of the mouse and select
“Com setting”.
b. In the “Dialog Menu”, select the values as explained below.
- Port : select a correct COM
- Baudrate : 38400
- Leave the rest as default values
B. Tx
1. Selecting Channel
- Select one of GSM or DCS Band and input appropriate channel.
2. Selecting APC
a. Select either Power level or Scaling Factor.
b. Power level
- Input appropriate value GSM (between 5~19) or DCS (between 0~15)
c. Scaling Factor
- A ‘Ramp Factor’appears on the screen.
- You may adjust the shape of the Ramp or directly input the values.
C. Rx
1. Selecting Channel
- Select one of GSM or DCS Band and input appropriate channel.
2. Gain Control Index (0~ 26) and RSSI level
- See if the value of RSSI is close to -16dBm when setting the value between 0 ~ 26 in Gain
Control Index.
- Normal phone should indicate the value of RSSI close to -16dBm.
6.3 Means of Test
a. Select a COM port
b. Set the values in Tx or Rx
c. After setting them all above, press Start button of Signal.

7. AUTO CALIBRATION
- 75 -
7. AUTO CALIBRATION
7.1 Overview
AutoCal (Auto Calibration) is the PC side calibration tool that perform Rx and Tx calibration with
Agilent 8960 or other equipment. AutoCal generate calibration data by communicating with phone
and measuring equipment and write it into calibration data block of flash memory in GSM phone.
7.2 Requirements
•Microsoft Windows98/ME
•AutoCal.exe
•GSM phone
•Agilent 8960 ( or other equipment )
7.3 Menu and settings
•Edit ➞ Ramp : Show reference power ramp window. Reference ramp is used in APC
procedure. You can open or save reference ramp data and edit it on notepad.
Picture 3. Reference ramp window.
•Edit ➞ Make bin & write : Make binary file from measured calibration data and write to the
phone. The name of binaryfile is cal.bin by default. You can
change it at Option ➞ Settings ➞ Bin files tab.
•Edit ➞ Make bin as : Make binary file as the other name.
•Edit- ➞ Make RF & BB bin : Make RF(AGC, APC) bin and BB(ADC) bin separately.

7. AUTO CALIBRATION
- 76 -
•Connection ➞ Connect to phone : Connect to the phone which you want to measure. This
procedure checks whether the PC is connected to
“Ag8960”or not. If not connected to “Ag8960”try to
connect to “Ag8960”. After that it performs sync. procedure
with phone. If the sync. procedure is successful state
column on statusbar changed to SETUP else you should
disconnect phone and try it again from the beginning. All
measurement is performed at state SETUP
•Connection ➞ Disconnect phone : Disconnect phone.
•Connection ➞ Port setting : Show COM port setting dialog you can change port
number, baud rate etc.
•Connection ➞ Connect to Ag8960 : Connect to Agilent 8960.
•Connection ➞ Disconnect Ag8960 :Disconnect Agilent 8960.
•Option ➞ Settings ➞ Gpib state : Show current primary Gpib state.
•Option ➞ Settings ➞ MPL : Set max Tx power level used in APC procedure.
•Option ➞ Settings ➞ CL : Set cable loss value.
•Option- ➞ Settings ➞ Bin file : Set default binary file name.
Picture 1. Buttons and status bar
1. Connect to phone
2. Disconnect phone
3. Port setting
4. Connect to Ag8960
5. Disconnect Ag8960
6. AGC tab
7. APC tab
8. Result window
9 . Band setting
10 . Sync. Button
(button 2 + button 1)
11. Start measure
12. Save result
13. Clear result window
14. Port connection state
15. Retry button
16. Ag8960 connection
state
17. Informations.
18. Current state.

7. AUTO CALIBRATION
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7.4 AGC
This procedure is for Rx calibration.
In this procedure, We can get RSSI correction value. Set band EGSM and press Start button the
result window will show correction values per every power level and gain code and the same
measure is performed per every frequency.
7.5 APC
This procedure is for Tx calibration.
In this procedure you can get proper scale factor value and measured power level.
7.6 ADC
This procedure is for battery calibration.
You can get mainBatteryConfigTable and temperatureConfigTable
7.7 Setting
Select automatic calibration item. If you uncheck one item calibration will stop from the unchecked
item. This is useful when you want to process only one item.
7.8 How to do calibration
A. Connect cable between phone and serial port of PC.
B. Connect Ag8960 equipment and phone.
C. Set correct port and baud rate.
D. Press “Connect to phone”button so that the state change to SETUP.
E. Set band to EGSM.
F. Select AGC tab.
G. Press Start button. AutoCal process all calibration procedure
i. AGC EGSM
ii. AGC DCS
iii. APC EGSM
iv. APC DCS
v. ADC
H. After finished all measurement. The state is return to SETUP.
I. Select Edit ➞ Make bin & write then cal.bin file will be generated and then the calibration data
will be written into phone.

8. ASSEMBLY INSTRUCTION
- 78 -
8. ASSEMBLY INSTRUCTION
8.1 Disassembly
1. Push the battery locker to remove the battery pack.
2. Loosen the 4 screws as shown below.
Figure 8-1. Removing Battery pack and screws.
3. Carefully lift up the bottom of Rare Cover first, then hold the covers and twist them.
Figure 8-2. Disassembly of Rear Cover and Front Cover.
.

8. ASSEMBLY INSTRUCTION
- 79 -
Figure 8-3. Reassmbly of of the covers.
Note: When reassembling the covers, assemble the Antenna hook first then the rest as shown in
Fig. 8-3.
4. Turn the Antenna anti-clockwise to remove from the cover.
5. Use a sharp awl to push away the antenna-bushing.
Figure 8-4. Removing Antenna and Antenna-bushing
1
2
3

8. ASSEMBLY INSTRUCTION
- 80 -
6. Use a tweezers to remove the Battery Locker.
Figure 8-5. Removing Battery Locker
1
1
2
3

8. ASSEMBLY INSTRUCTION
- 81 -
8.2 Disassembly of Front Cover Components
1. Lift up the Main PCB carefully and melt the solder connecting the Main PCB and the Flexible
PCB.
Figure 8-6. Removing solder on Main PCB
2. Then remove the locker as shown below.
Figure 8-7. Removing locker on Main PCB
Main PCB

8. ASSEMBLY INSTRUCTION
- 82 -
3. Push away the Volume BTN and function BTN.
4. For removing the Indicator, use a small driver to push it down.
Figure 8-8. Removing Buttons and Indicator
5. Use a small ‘-’type driver to push away a pin from the hinge.
6. Hold the front cover and pull out the left hinge of folder first and then the right one.
Figure 8-9. Removing Folder
1
2