LG KP220 - Cell Phone 60 MB User manual

Date: March, 2008 / Issue 1.0
Service Manual Model : KP220
Service Manual
KP220
Internal Use Only

AMENDMENT RECORD
AMENDMENT RECORD SHEET
Issue Number Date
Draft 1.00 29.11.2007
Draft 1.2 14.02.2008
Draft 1.3 18.02.2008
For details of previous history refer to archival documents.
New Issue Number – Date Changes This Issue, Page and Description Remarks
Draft 1.00 29.11.2007 All for Publication First draft
Issue
Draft 1.2 14.02.2008 All for Publication Second
draft Issue
Draft 1.3 18.02.2008 All for Publication Third draft
Issue
KP220 SERVICE MANUAL V1.2

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SECTION 1
Introduction
1
KP220 SERVICE MANUAL V1.2

1. Introduction
The variation of “KP220” is shown below.
This Service Manual is indicated for 7338.
Variation Note.
Product Code Trade Name
7338 XXXXXXXX KP220
KP220 SERVICE MANUAL V1.2

This is the Electronic Service Manual for KP220 Triple Band GSM Digital
Cellular Telephone from LG. It contains specific information on repair and test
procedures.
For details of user functions, general operation and installation, please refer to the
User Guide.
The Service Manual is set out in the following sections.
1. Precautions for Repair Work : provides general guidelines for
undertaking safe and efficient repair work.
2. Unit Specification: provides the technical specifications for
KG195 Triple Band GSM Digital Cellular Telephone.
3. Introduction of Service Level :
a)
b)
5.
6.
Service Level 1:describes definition of Service Level 1, equipment and
tools required for this level.
Service Level 2 :describes definition, equipment and tools required for
Service Level 2.
4. Circuit Description: provides functional details of the circuits, block
diagrams and component purpose descriptions.
Servicing : defines the jigs, fixtures and test configurations required for
servicing the product; and describes the processes of assembly and
disassembly.
Troubleshooting : provides an aid to fault finding the product. Includes,
using the signal levels and plots at various parts of the circuit.
7. Device Information : provides functional information and pin-outs of
most of the semiconductor devices within the HHP.
8. Glossary : terms used in this GSM and this manual.
KP220 SERVICE MANUAL V1.2

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Main Menu
SECTION 2
Precautions
for Repair Work
2
KP220 SERVICE MANUAL V1.2

PRECAUTION
Important
Please read the following cautions, notes and
warnings before progressing through this manual or
undertaking any repair action.
Remember: SAFETY FIRST!
CAUTION:
AC Power Cord:
Care must be taken not to damage the AC power cord as fire or electric shock may
result.
Battery Pack:
Only use the specified batteries and chargers with this equipment.
Do not short the battery terminals together.
Keep the battery pack away from fire and sources of ignition.
Remember to recharge the battery pack after each use.
Before Powering up the Equipment:
•Only switch on the telephone’s power once the test or installation set-up is
complete.
•Switching on at the wrong time may result in electric shock or damage to system
components.
•Always ensure that the power is switched off before making connections /
disconnection’s.
•It is important to check that the correct DC voltage is applied to the equipment to
prevent electrical damage.
Component Polarity:
Always check the polarity of connections and components before soldering.
Particular attention must be paid to IC.s, diodes, transistors, capacitors and any
other semiconductor device that is polarity dependent.
KP220 SERVICE MANUAL V1.2

Electrostatic Damage (ESD):
Semiconductor devices are easily damaged by electrostatic discharge. Many of the
procedures detailed in this manual involve disassembly of the equipment and
therefore handling of the printed circuit boards.
To protect these devices from ESD a wrist strap connected to ground must be worn.
In addition to this the work surface must be covered with an anti-electrostatic mat,
which should also be grounded.
If printed circuit boards are to be stored without being re-assembled into their
equipment, then they must be kept in an anti-electrostatic bag.
Grounding:
Each piece of test equipment should be electrically grounded. A third (grounding)
pin is provided as a safety feature. Ensure that the electrical outlet also contains
this feature.
Cosmetic Protection during Repair Work:
Always ensure that the working surface is kept clean and free from abrasive
materials.
The LCD is very susceptible to scratches and damage. It should be covered with
clear adhesive vinyl while the equipment is disassembled.
Storage of Faulty Components:
Any components that are replaced due to failure should be kept safely in an anti-
electrostatic container. NEC’s Quality or Research & Development Departments
may require them to make quality and reliability investigations.
No Fault Found Equipment:
In some cases the reported symptom may not be apparent. You may subject the
equipment to a controlled amount of stress, vibration and temperature variation to
see if the fault occurs.
Care should be taken not to apply excessive stress or vibration or extreme
temperature variations as further faults may develop.
KP220 SERVICE MANUAL V1.2

Soldering and Disordering :
The solder used is only Pb-free.
Fast, accurate and high quality soldering is required to minimize the risk of heat
damage to the electronic components.
It is necessary to adjust the temperature of soldering tip to 330 degrees or less.
The soldering tip should not be in contact with components or PCB tracks for longer
than 4 seconds (average). This time depends on temperature conditions of parts.
Heat the pad on the PCB and the lead, quickly apply solder, remove heat and cool.
After soldering is complete, ensure that all solder joints are of good quality - no dry
joints, solder bridges, cracks or excess solder.
The majority of chip components are machine mounted using solder paste.
Removal of the solder is not sufficient for chip component removal. Each solder
point must be heated simultaneously and quickly (to prevent component and PCB
damage). When the solder has melted, remove the component with tweezers.
Short Circuits:
Care must be taken to avoid short circuits. Soldering, solder dust, screws, metal
clippings, metal wrist watches etc. can cause short circuits on PCBs which may
result in component damage.
Test Equipment Calibration:
Your test equipment should be calibrated before use. Frequent calibration is
essential to ensure high quality and reliable repairs.
Cleaning:
Before cleaning ensure that the telephone is switched off and disconnected from the
power source. Cleaning should be done using a soft dry cloth. If the equipment is
heavily soiled a soft cloth soaked in a mild synthetic detergent diluted in water may
be used.
Never use benzene or any other chemicals to clean the equipment.
RF Shielding:
It is advisable to carry out detailed measurements and repair (in particular RX) in a
shielded area to minimize RF interference.
AC Adapter and Battery Charger:
The AC adapter and battery chargers are for indoor use only. Ensure that the
devices are not exposed to rain or moisture
KP220 SERVICE MANUAL V1.2

KP220 SERVICE MANUAL V1.2
Electrical Safety:
Electrical equipment is hazardous if misused. Any repairs must be carried out with
care and only by authorized personnel.
Ensure all power sources are switched off and power cords removed before
undertaking any repairs.
Hazardous Waste:
The battery pack, if incorrectly disposed of, is an environmental hazard. It must be
disposed of in accordance with the regulations of the country concerned.
Never dispose of the battery pack in fire or water.
Confidentiality:
The circuitry within this equipment contains several components that are regarded
as company confidential. Only use NEC specified parts as replacements.
RF Injury:
To avoid RF injury, direct exposure to radio frequency energy should be avoided. In
particular, exposed parts of your body (especially the eyes and face) should not
come into contact with the antenna while the equipment is transmitting.
Storage Conditions:
It is recommended that the following storage conditions should be avoided to
prevent damage to the equipment: -
Dusty.
Humid.
Near to magnetic equipment
In direct sunlight
Ventilation:
Repair areas should be well ventilated and fume extraction systems should be
installed where necessary. Potential hazardous substances are solder fumes, flux,
alcohol etc.
PCB Handling:
It is recommend that cotton gloves are worn during repair work. This is to protect
your hands from chemical contamination and to protect the PCBs from fingerprints
and humidity
.