LG G1800 User manual

G1800
Version: 1A

Every care has been taken to ensure that contents of this service manual give an accurate representation
of the equipment. However, DARTS TECHNOLOGIES CORP. accepts no responsibility for inaccuracies
which may occur and reserves the right to make changes to the design without prior notice.
CONTENTS
1. INTRODUCTION
1.1 Purpose of the Manual
1.2 Structure of the Manual
1.3 Servicing Responsibilities
2. GENERAL DESCRIPTION
2.1 General
2.2 Features
2.3 Hand portable Main Kits
3. OPERATING INSTRUCTIONS
3.1 General
3.2 Liquid Crystal Display
3.3 Location of Controls
3.4 Alpha Entry
3.4.1. Character Set / Key Assignments
3.5 Public Man Machine Interface (MMI)
3.5.1. Reading the Phonebook Memory Location
3.5.2. Features for Factory Service
3.5.3. Tips for Call Option
3.6 Security Procedure
3.7 Troubleshooting
4. ASSEMBLY INSTRUCTIONS
4.1 Assembly Structure
4.2 Antenna sub assembly
4.2.1. Appendix 1 Speaker module sub assembly
4.3 PCB sub assembly
4.4 Top case sub assembly
4.5 Bottom case sub assembly
4.6 Main assembly

5. TECHNICAL SPECIFICATION
5.1 TX Characteristics
5.1.1. Frequency Error
5.1.2. Modulation Phase Error
5.1.3. Output RF Spectrum due to Modulation
5.1.4. Output RF Spectrum due to Switching Transients
5.1.5. Spurious Emissions at Antenna Connector
5.1.6. Residual Peak Power
5.2 Rx Characteristics
5.2.1. Sensitivity
6. BLOCK DIAGRAM
6.1 G1800 Base band Hardware Typical application and Block Diagram
6.2 G1800 RF Block Diagram
7. G1800 PCB PLACEMENT
8. SPPL list

IMPORTANT
This document is intended for use by qualified service personnel only.
Company Policy
Our policy is of continuous development; details of all technical modifications will be included with service
bulletins.
While every endeavor has been made to ensure the accuracy of this document, some errors may exist. If any
errors are found by the reader, please notified it to company

Warnings and Cautions
Please refer to the phone’s user guide for instructions relating to operation, care and
maintenance including important safety information. Note also the following:
Warnings:
1. CARE MUST BE TAKEN ON INSTALLATION IN VEHICLES FITTED WITH ELECTRONIC ENGINE
MANAGEMENT SYSTEMS AND ANTI–SKID BRAKING SYSTEMS. UNDER CERTAIN FAULT
CONDITIONS, EMITTED RF ENERGY CAN AFFECT THEIR OPERATION. IF NECESSARY,
CONSULT THE VEHICLE DEALER/MANUFACTURER TO DETERMINE THE
IMMUNITY OF VEHICLE ELECTRONIC SYSTEMS TO RFENERGY.
2. THE HANDPORTABLE TELEPHONE MUST NOT BE OPERATED
IN AREAS LIKELY TO CONTAIN POTENTIALLY EXPLOSIVE ATMOSPHERES EG PETROL
STATIONS (SERVICE STATIONS), BLASTING AREAS ETC.
3. OPERATION OF ANY RADIO TRANSMITTING EQUIPMENT, INCLUDING CELLULAR
TELEPHONES, MAY INTERFERE WITH THE FUNCTIONALITY OF INADEQUATELY PROTECTED
MEDICAL DEVICES. CONSULT A PHYSICIAN OR THE MANUFACTURER OF THE MEDICAL
DEVICE IF YOU HAVE ANY QUESTIONS. OTHER ELECTRONIC EQUIPMENT MAY
ALSO BE SUBJECT TO INTERFERENCE.
Cautions:
1. Servicing and alignment must be undertaken by qualified personnel only.
2. Ensure all work is carried out at an anti–static workstation and that an anti–static wrist strap
is worn.
3. Ensure solder, wire, or foreign matter does not enter the telephone as damage may result.
4. Use only approved components as specified in the parts list.
5. Ensure all components, modules screws and insulators are correctly re–fitted after servicing
and alignment. Ensure all cables and wires are repositioned correctly.

1. INTRODUCTION
1.1. Purpose of the Manual
This service manual contains the information and procedures required for instilling, operating and servicing
the LG GSM Personal Cellular Mobile Telephone system operating on GSM Digital Cellular Networks.
1.2. Structure of the manual
The manual is structured to provide service engineering personnel with the following information and
procedures:
1. General and technical information – provides a basic understanding of the equipment, kits and options,
together with detailed information for each of the major component parts.
2. Installation and operating information – provides instructions for unpacking, installing and operating the
equipment.
3. Servicing information – provides complete instructions for testing, disassembly, and reassembly of the
product. Step-by-step troubleshooting information is given to enable the isolation and identification of a
malfunction, and thus determine what corrective action should be taken. The test information enable
verification of the integrity of the equipment after any remedial action has been carried out.
4. Illustrated parts list – provides to enable the identification of all cosmetic and some electrical components,
for the ordering of replacement parts.
1.3. Servicing Responsibilities
The procedures described in this manual must performed by qualified service engineering personnel, at an
authorized service center.
The service engineering personnel are responsible for fault diagnosis and repair of all equipment described in
this manual.

2. GENERAL DESCRIPTION
2.1. General
This section provides general description and kit composition detailed for the GSM Hand portable Telephone
system and optional kits.
2.2. Features
The LG Telephone Model G1800 is a high performance small, light handset for business and domestic use. The
following features are provided:
1. Triple Codec which includes Half Rate / Full Rate and Enhanced Full Rate (EFR) speech codec.
2. Tri Band E-GSM900 and DCS1800 operation.
3. GPRS Service.
4. T9 Text Entry.
5. Voice Ringer.
6. Wireless Application Protocol (WAP) Browser.
7. Backup Battery.
8. Downloadable polyphonic melody ring tones.
9. Clock, Calculator and Currency Converter.

2.3. Hand portable Main Kits
Figure 2.1: Hand portable Main Unit Kit Content
Item Description Part Number
1 Handset G1800
2 AC Travel Charger TA-18GR
3 Standard Battery (Li-lon 720mAh) SBPL0076310

3.OPERATING INSTRUCTIONS
3.1. General
This section provides a brief guide to the operation and facilities available on the telephone handset. Refer to
the Operating Instruction supplied with the telephone for full operational information.
3.2. Liquid Crystal Display
The telephone handset has a graphical chip on glass display. The following icons are available:
2
4
1
3
5
Figure 3.1: Crystal Display
1. Top of the screen shows Essential Indicators. (See table below)
2. Next line displays the operator name
3. In the middle screen shows date/time.
4. To enter Menu press left selection key.
5. To use Name in the phone book press right selection key.

Essential indicators
Indicates signal strength and alternate line service.
Shows handset current battery charge strength.
Indicates the phone keypad is locked.
Indicates the profiles alert type is Ring
Indicates the profiles alert type is vibration.
Indicates the profiles alert type is vibration and ring.
Indicates the profiles alert type is vibration then ring.
Indicates the profiles alert type is light only.
The Alarm clock is set on.
Indicates “roaming”.
Indicates missed call.
Indicates Broadcast set on.
Indicates new text messages.
Indicates call diverted is set on
Indicates record function on

3.3. Location of Controls
Figure 3.2: Location of Controls
Earpiece
Power on / charging indicator
Display Screen
USB connector Microphone
B
D
B
C
Adjust Volume Side key
Audio Play
A
Hand-free kit connection
Speaker
Battery Cover
Antenna area
Release Knob

3.4. Alpha Entry
.4.1. Character Set / KeyAssignments
here are 20 keys on G1800, including 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, *, #, SEND, END, Left-Soft-Key (LSK),
ad Layout’s reference.
3
T
Right-Soft-Key (RSK), 4-way Navigation Key.
The following ID drawing is only used for Keyp
Figure 3.3:G1800 Keypad Layout

Key Function List
A. Power/End key.
•Switch phone o dn an off. Also, ends a call or Exit from any function and back to
Idle mode.
B. Selection Key
•The function of ey ethe k s dep nds on the text shown on the display above the keys.
For example, Menu and Name in Idle mode.
C.Navigation Key
•Use for quick acc oess to ph ne functions in Idle mode.
enu
u
•he phone book or through the
♦Up key: Access to the Favorites menu.
♦Down key: Access to the Phone book m
♦Left key: Access to the Profiles menu
♦Right key: Access to the Messages men
Scroll through names and numbers stored in t
phone’s menus, submenus, and option list.
D. Send/Answer Key
•Make and answer calls; press in Idle mode to see recent dialed calls.
•0-9 input number and character
E. Left Side Key volume•Adjust handset
. MP3 Play Key enter audio player in Idle mode. FThe shortcut to

3.5. Public Man Machine Interface (MMI)
.5.1. Reading the Phonebook Memory Location
<MEMORY LOCATION> #
the location number, e.g. 007 can be 7.
.5.2. Features for Factory Service
3
#
Leading zeros can be left out of
3
Features Description
Production or service mode
By 2945#*# to enter production mode
1. Contrast 4.Backlight
2. Vibrator 5.Keypad
3. Mic 6.Speaker
Display IMEI By *#06#
Enter Engineer Mode 633#By *#3646
R geeset to default langua *#0000#[SEND]
Set language to Russian *#0007#[SEND]
Set language to English *#0044#[SEND]

3.5.3.Tips for Call Option
call can be connected to any single caller by pressing Option key. When user press Option key during active
a holding call.
all.
d active.
i-party call.
l.
all during the conversation.
all.
Recorder submenu.
ency) tone dialing system.
.6. Security Procedure
A
call, user can choose one of those functions from the list:
Hold: put a call on.
Retrieve: reconnect
Retrieve All: reconnect all holding c
Swap: switch between the call on hold an
Conference: make a multi-party conversation.
Transfer: transfer a call.
Spilt: to suspend the mult
End Single: end one of conference cal
End All: end a multi-party call.
End: End a call.
Mute: mute the c
New Call: make a new call during an active c
Phonebook: shortcut to phonebook menu.
SMS: shortcut to Message menu.
Sound Recorder: shortcut to Sound
DTMF: set On / Off for DTMF (Dual Tone Multi-Frequ
3
Features Description
PIN 1 and 2 PIN activate, changing and deactivation
PIN control Menu entry to change PIN2/phone code
Phone code Manufacture defined codes to protect
phone (4 – 8 digits). Changeable by user.
FDN Fixed Dialled Number for limited Dialling
BDN Barred Dialled Number for limited Dialling

3.7. Troubleshooting
he user is given the following information and advised to contact the dealer if the problems persist: T
Problem Cause Remedy
Telephone will not t the battery pack is fully charged
switch on Check tha and correctly connected to the telephone.
Extremely short battery
life for a new battery
pack
The network in use and the
condition of the battery pack
can affect battery life.
Avoid areas of poor reception. Ensure
batteries are fully charged.
Short battery life for an
old battery pack The battery pack was worn out. Replace with a new one.
The battery level
indicator do
light when charging
es not a short
If a battery is deeply
discharged it will take
time before there is sufficient
owner in the telephone to
light the battery level
indicator .
Leave to charge for several minutes in .temperatures between +5°C and + 35°C
The telep e ihon s locked. Unlock the telephone Lock).(Menu: Security: Phone
Outgoing calls are barred. Disable the outgoing call barring (Menu:
Security: Call Bar).
Calls cannot be made
k.
The telephone is not
registered to a networ Move to a coverage area and operate the telephone after it has registered with a
network.
Calls cannot be made
from Fixed Dial Store Check that SIM supports Fixed Dial Check if the Fixed Dial is switched on (Menu:
Security: Fixed Dial). Check the telephone
number is stored in the Fixed Dial.
The telephone is not
switched on. Switch the telephone on.
Incoming calls are barred. Disable the incoming call barring (Menu:
Security: Call Bar).
Calls cannot be received
k.
The telephone is not
registered to a networ Move to a coverage area and operate the telephone after it has registered with a
network.
Emergency calls cannot
be made User’s phone is not in a GSM coverage area. Check that the antenna symbol is displayed. Move to coverage are
operate the telephone when the antenna
symbol is displayed.
and
The telephone is locked. (Menu: Security:Unlock the telephone
Phone Lock).
Telephone umbers
Fixed Dial is switched on ed Dial (Menu: Security:
Cannot be recalled Switch off Fix
Fixed Dial).

4. ASSEMBLY INSTRUCTIONS
4.1. Assembly Structure

4.2.Antenna sub assembly
zTo tear off paper liner form bracket sticker.
zTo add antenna bracket on antenna base.
zTo add antenna bracket on antenna base.
zTo add set (refer to appendix 1) on antenna base.

4.2.1. Appendix 1 Speaker module sub assembly
zTo stick speaker rubber on speaker.
zTo stick speaker gasket on speaker rear side.

4.3.PCB sub assembly
zTo add shield cover on PCB.
zTo hook LCM bracket assembly on PCB.
zTo stick metal dome film on PCB.