LG G5300 User manual

GSM Phone
SERVICE MANUAL
MODEL : G5300 / W5300
P/N : MMBD0020301 DECEMBER, 2002
SERVICE MANUAL MODEL : G5300 / W5300

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1. INTRODUCTION.................................. 3
1.1 Purpose ................................................. 3
1.2 Regulatory Information .......................... 3
A. Security ............................................. 3
B. Incidence of Harm ............................. 3
C. Changes in Service ........................... 3
D. Maintenance Limitations ................... 3
E. Notice of Radiated Emissions ............ 4
F. Pictures ............................................. 4
G. Interference and Attenuation ............ 4
H. Electrostatic Sensitive Devices ......... 4
1.3 Abbreviations ......................................... 5
2. PERFORMANCE .................................... 6
2.1 H/W Feature .......................................... 6
2.2 Technical Specification .......................... 7
3. TECHNICAL BRIEF ............................ 11
3.1 General Description ............................. 11
3.2 Receiver ............................................... 11
A. RF front end .................................... 12
B. Demodulator and baseband
processing ....................................... 12
C. DC Offset Compensation ................ 12
3.3 Transmitter Part ................................... 13
A. IF Modulator .................................... 13
B. OPLL ............................................... 14
C. Synthesizer ..................................... 14
D. Power Amplifier ............................... 15
3.4 13 MHz Clock ...................................... 16
3.5 Power Supplies and Control Signals ... 16
3.6 Testing Set-up and Checking Signals .. 17
A. Received RF Level and Checks ...... 17
B. Transmitted RF Level and Checks .. 17
3.7 Digital Main Processor ......................... 30
3.8 Analog Main Processor ........................ 35
3.9 Power management ............................. 40
3.10 Memories ........................................... 42
3.11 Display and Interface ......................... 42
3.12 Keypad Switches and Scanning ........ 43
3.13 Microphone ........................................ 44
3.14 Earpiece ............................................. 45
3.15 Hands-free Interface .......................... 45
3.16 Headset Jack Interface ...................... 45
3.17 Key Back-light Illumination ................. 46
3.18 LCD Back-light Illumination ................ 47
3.19 Speaker & MIDI IC ............................. 48
4. TROUBLE SHOOTING ..................... 50
4.1 RF Components ................................. 50
4.2 Rx Trouble .......................................... 51
4.3 Tx Trouble .......................................... 59
4.4 Power On Trouble .............................. 72
4.5 Charging Trouble ............................... 74
4.6 LCD Trouble ....................................... 76
4.7 Receiver Trouble ................................ 78
4.8 Speaker Trouble ................................. 80
4.9 Mic. Trouble ........................................ 83
4.10 Vibrator Trouble ............................... 86
4.11 Backlight LED Trouble ..................... 88
4.12 SIM Detect Trouble .......................... 90
4.13 Earphone Trouble ............................ 92
4.14 HFK Trouble ..................................... 97
5. DISASSEMBLY
INSTRUCTION ................................... 100
5.1 Disassembly ..................................... 100
6. DOWNLOAD AND
CALIBRATION ................................... 103
6.1 Download ......................................... 103
6.2 Calibration ........................................ 109
A. Equipment List .............................. 109
B. Equipment Setup ........................... 109
C. Test Jig Operation ......................... 110
D. Procedure ..................................... 111
Table Of Contents

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7. BLOCK DIAGRAM ............................. 112
8. CIRCUIT DIAGRAM ........................... 113
8.1 MAIN ................................................ 113
8.2 MEMORY & MMI .............................. 114
8.3 MIDI .................................................. 115
8.4 RF CIRCUIT ..................................... 116
9. PCB LAYOUT ..................................... 117
10. ENGINEERING MODE .................. 119
A. About Engineering Mode ............... 119
B. Access Codes ............................... 119
C. Key Operation ............................... 119
10.1 BB Test [MENU 1] ........................ 119
A. LCD [1-1] ....................................... 119
B. Backlight [1-2] ............................... 119
C. Buzzer [1-3] ................................... 119
D. Vibrator [1-4] ................................. 119
E. ADC (Analog to Digital
Converter) [1-5] ............................. 120
F. BATTERY [1-6] .............................. 120
G. Audio [1-7] .................................... 120
H. DAI (Digital Audio Interface) [1-8] .120
10.2 RF Test [MENU 2] ........................ 121
A. SAR Test [2-1] ............................... 121
10.3 MF Mode [MENU 3] ...................... 121
A. All auto test [3-1] ........................... 121
B. Backlight [3-2] ............................... 121
C. Buzzer [3-3] ................................... 121
D. Vibrator [3-4] ................................. 121
E. LCD [3-5] ....................................... 121
F. Key pad [3-6] ................................. 121
10.4 Trace option [MENU 4] ................. 122
10.5 Call Timer [MENU 5] ..................... 122
A. All calls [5-1] .................................. 122
B. Reset settings [5-2] ....................... 122
10.6 Fact. Reset [MENU 6] ................... 122
10.7 S/W version [MENU 7] .................. 122
11. STAND ALONE TEST ................... 123
11.1 Introduction ................................... 123
A. Tx Test .......................................... 123
B. Rx Test .......................................... 123
11.2 Setting Method ............................. 123
A. COM port ....................................... 123
B. Tx .................................................. 123
C. Rx .................................................. 123
11.3 Means of Test ............................... 124
12. AUTO CALIBRATION ................... 125
12.1 Overview ....................................... 125
12.2 Requirements ............................... 125
12.3 Menu and settings ........................ 125
12.4 AGC .............................................. 127
12.5 APC .............................................. 127
12.6 ADC .............................................. 127
12.7 Setting .......................................... 127
12.8 How to do calibration .................... 127
13. EXPLODED VIEW &
REPLACEMENT PART LIST ...... 128
13.1 Accessories .................................. 130
13.2 Replacement Part List .................. 131

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 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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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.

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 milliwatt
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
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 Paeudo 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

2. PERFORMANCE
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2. PERFORMANCE
2.1 H/W Features
Item Feature Comment
Li-ion, 850 mAh
Standard Battery Si e: 42.73 64.25 7.5mm
Weight: 30g
Under the minimum current consumption environment
Stand by Current (such as paging period 9), the level of standby current is
below 4mA.
Talk time Up to 3 hours (GSM TX Level 7)
Stand by time Up to 200 hours (Paging Period: 9, RSSI: -85 dBm)
Charging time 3 hours
RX Sensitivity GSM, EGSM: -105dBm, DCS: -105dBm
TX output power GSM, EGSM: 32 dBm (Level 5)
DCS: 29dBm (Level 0)
GPRS compatibility Class 10
SIM card type 3V Small
Display 128 128 pixel 65K Color LCD
Hard icons
Key Pad:
Status Indicator 0 ~ 9, #, *, Up/Down Navigation Key
& keypad Confirm Key, Clear Key
Send Key, END/PWR Key
ANT Internal
EAR Phone Jack Yes
PC Synchronization Yes
Speech coding EFR/FR/HR
Data and Fax Yes
Vibrator Yes
Loud Speaker Yes
Voice Recording 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) GSM
Offset from Carrier (kHz) Max. (dBm)
400 -22
600 -24
1,200 -24
1,800 -27
7 Spurious Emissions 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