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Internal Use Only
Website http://biz.lgservice.com
SERVICE MANUAL
MICRO HI-FI SYSTEM
SERVICE MANUAL
MODEL: XA105 (XAS105F)
MODEL: XA105 (XAS105F)
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
P/NO : AFN73972696 JULY, 2010
CONTENTS
SECTION 1 ........ SUMMARY
SECTION 2 ........ CABINET & MAIN CHASSIS
SECTION 3 ........ ELECTRICAL
SECTION 4 ........ REPLACEMENT PARTS LIST
1-1
SECTION 1
SUMMARY
CONTENTS
SERVICING PRECAUTIONS ................................................................................................................... 1-3
LASER BEAM SAFETY PRECAUTIONS ............................................................................................ 1-5
ESD PRECAUTIONS .................................................................................................................................. 1-6
SAFETY CHECK AFTER SERVICING.................................................................................................. 1-7
SERVICE INFORMATION FOR EEPROM .......................................................................................... 1-8
PROGRAM UPDATE GUIDE ................................................................................................................... 1-9
SPECIFICATIONS ..................................................................................................................................... 1-10
1-2
SERVICING PRECAUTIONS
NOTES REGARDING HANDLING OF THE PICK-UP
1. Notes for transport and storage
1) The pick-up should always be left in its conductive bag until immediately prior to use.
2) The pick-up should never be subjected to external pressure or impact.
Storage in conductive bag Drop impact
2. Repair notes
1) The pick-up incorporates a strong magnet, and so should never be brought close to magnetic materials.
2) The pick-up should always be handled correctly and carefully, taking care to avoid external pressure and
impact. If it is subjected to strong pressure or impact, the result may be an operational malfunction and/or
damage to the printed-circuit board.
3) Each and every pick-up is already individually adjusted to a high degree of precision, and for that reason
the adjustment point and installation screws should absolutely never be touched.
4) Laser beams may damage the eyes!
Absolutely never permit laser beams to enter the eyes!
Also NEVER switch ON the power to the laser output part (lens, etc.) of the pick-up if it is damaged.
NEVER look directly at the laser beam, and don't allow
contact with fingers or other exposed skin.
5) Cleaning the lens surface
If there is dust on the lens surface, the dust should be cleaned away by using an air bush (such as used
for camera lens). The lens is held by a delicate spring. When cleaning the lens surface, therefore, a cotton
swab should be used, taking care not to distort lens.
Pressure
Magnet
Pressure
How to hold the pick-up
Cotton swab
Conductive Sheet
6) Never attempt to disassemble the pick-up.
Spring has excess pressure. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab.
(Do not use any other liquid cleaners, because they will damage the lens.) Take care not to use too much
of this alcohol on the swab, and do not allow the alcohol to get inside the pick-up.
1-3
NOTES REGARDING COMPACT DISC PLAYER REPAIRS
1. Preparations
1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These components
are sensitive to, and easily affected by, static electricity. If such static electricity is high voltage, components
can be damaged, and for that reason components should be handled with care.
2) The pick-up is composed of many optical components and other high-precision components. Care must be
taken, therefore, to avoid repair or storage where the temperature or humidity is high, where strong magnet-
ism is present, or where there is excessive dust.
2. Notes for repair
1) Before replacing a component part, first disconnect the power supply lead wire from the unit
2) All equipment, measuring instruments and tools must be grounded.
3) The workbench should be covered with a conductive sheet and grounded.
When removing the laser pick-up from its conductive bag, do not place the pick-up on the bag. (This is
because there is the possibility of damage by static electricity.)
4) To prevent AC leakage, the metal part of the soldering iron should be grounded.
5) Workers should be grounded by an armband (1 M)
6) Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to prevent stat-
ic electricity changes in the clothing to escape from the armband.
7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin.
Armband
Resistor
(1 M)
Resistor
Conductive
(1 M)
Sheet
1-4
LASER BEAM SAFETY PRECAUTIONS
This DVD player uses a pick-up that emits a laser beam.
Do not look directly at the laser beam
coming from the pickup or allow it to strike
against your skin.
The laser beam is emitted from the location shown in the figure. When checking the laser diode, be sure to keep
your eyes at least 30 cm away from the pick-up lens when the diode is turned on. Do not look directly at the laser
beam.
CAUTION: Use of controls and adjustments, or doing procedures other than those specified herein, may result
in hazardous radiation exposure.
Drive Mechanism Assembly
Laser Beam Radiation
Laser Pick-up Location:
Inside Top of CD mechanism.
Turntable
1-5
ESD PRECAUTIONS
Electrostatically Sensitive Devices (ESD)
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components
commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated
circuits and some field-effect transistors and semiconductor chip components. The following techniques should
be used to help reduce the incidence of component damage caused by static electricity.
1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off
any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a
commercially available discharging wrist strap device, which should be removed for potential shock reasons
prior to applying power to the unit under test.
2. After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive surface
such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ESD devices.
4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static" can
generate electrical charges sufficient to damage ESD devices.
5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESD
devices.
6. Do not remove a replacement ESD device from its protective package until immediately before you are
ready to install it. (Most replacement ESD devices are packaged with leads electrically shorted together by
conductive foam, aluminum foil or comparable conductive materials).
7. Immediately before removing the protective material from the leads of a replacement ESD device, touch the
protective material to the chassis or circuit assembly into which the device will by installed.
CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE ALL OTHER
SAFETY PRECAUTIONS.
8. Minimize bodily motions when handing unpackaged replacement ESD devices. (Otherwise harmless motion
such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate
static electricity sufficient to damage an ESD device).
CAUTION. GRAPHIC SYMBOLS
THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS
INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED
"DANGEROUS VOLTAGE" THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF
ELECTRIC SHOCK.
THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE
SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE
LITERATURE.
1-6
SAFETY CHECK AFTER SERVICING
Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts, and
wires have been returned to their original positions. Afterwards, do the following tests and confirm the specified
values to verify compliance with safety standards.
1. Clearance Distance
When replacing primary circuit components, confirm
specified clearance distance (d) and (d') between Chassis or Secondary Conductor
soldered terminals, and between terminals and
Primary Circuit
surrounding metallic parts. (See Fig. 1)
d' d
Table 1: Ratings for selected area
AC Line Voltage Clearance Distance (d), (d')
110 V ~ 220 V 3.2 mm (0.126 inches)
Note: This table is unofficial and for reference only.
Be sure to confirm the precise values.
Fig. 1
2. Leakage Current Test
Confirm the specified (or lower) leakage current
Exposed Accessible Part
between B (earth ground, power cord plug prongs)
and externally exposed accessible parts (RF terminals,
antenna terminals, video and audio input and output Z
terminals, microphone jacks, earphone jacks, etc.) is
lower than or equal to the specified value in the table AC Voltmeter
(High Impedance)
below.
Measuring Method (Power ON):
Insert load Z between B (earth ground, power cord
Earth Ground
plug prongs) and exposed accessible parts. Use an AC B
Power Cord Plug Prongs
voltmeter to measure across the terminals of load Z.
See Fig. 2 and the following table. Fig. 2
Table 2: Leakage current ratings for selected areas
AC Line Voltage Load Z Leakage Current (i) Earth Ground (B) to:
0.15 F CAP. & 1.5 k RES.
110 V ~ 220 V i 0.5 mA Peak Exposed accessible parts
Connected in parallel
Note: This table is unofficial and for reference only. Be sure to confirm the precise values.
1-7
SERVICE INFORMATION FOR EEPROM
POWER ON
FLD no disc status
Front `STOP' + Remote control `FWD DETECT NEW EEPROM
SKIP' push same timing during 5s (OPTION EDIT SCREEN)
NAME HEX
OP0 xx
FLD `OP0-xx .... OP1 xx
OP2 xx
. .
. .
Move to appropriate position and . .
make changes with remote control
`Next / Previous / Mode / Play' key.
Press STOP key
FLD `E2P CLEAR'
Press `POWER' key once.
Completed
1-8
PROGRAM UPDATE GUIDE
1. HOW TO UPDATE ESS PROGRAM
(1) Rename the file name to download as "LG_(MODEL NAME)_(Vresion).ROM " in upper cases.
ex) XA105 : "LG_XA105_1006010.ROM"
Refer to the Standard for naming of software.
(2) Copy the file to the formatted USB, and burn it.
(3) Move to the USB function, and insert the USB to the set.
The upgrade information will be shown on the screen.
(4) Remove the USB.
(5) Remove and reconnect the power cable when it changes to logo screen from upgrade information.
Then the upgrade process is completed.
2. HOW TO UPDATE MCS PROGRAM
(1) Change the file name to download as "(MODEL NAME)_(Option)_(Version).MCS".
ex) XA105_01010_07.HEX
(2) Copy the file to the root folder of USB storage.
(3) Put the USB into the set.
Then the upgrade process will be started with the upgrade information.
(4) If the upgrade process is complete, the set will be rebooted with "SUCCESS" message.
1-9
SPECIFICATIONS