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
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
Pressure
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 magnetism 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 (1M Ω)
6) Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to prevent
static 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 Ω)
Resistor
(1 M Ω)
Conductive
Sheet
1-4
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.
1-5
SERVICE INFORMATION FOR EEPROM
POWER ON
DVD LOGO Status (NO Disk status)
Remote control
Pause key-->1-->4-->7-->2 in order.
Press number 0~9, Press character
A~F (1~6 for a while)
▲
Use arrow key (
▲
▲
▲
) to move
to appropriate position and make
changes
5) Enter into the system information for check the version, options and check sum.
6) Power off −> on.
Attention:
After DVD program download, never input options and check the version before power cord out.
2. How to enter into System Information
1) Enter into SETUP menu in NO Disc.
2) Put on cursor [Highlight] 16:9 wide option of TV aspect in SETUP menu.
3) Press follow key in continuous using remote control.
1 −> 3 −> 9 −> 7 −> 1 −> 3 −> 9 −> ENTER
3. How to update program
3-1. How to update MTK DVD program
1) Change the fi lename to download as “LG_(MODEL NAME).ROM”.
[Both Upper and Lower case In fi lename is possible]
Ex.) HT306: “LG_HT306.ROM”
2) Copy the fi le 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, press PLAY key of the remote control.
5) Remove and reconnect the power cable when it changes to logo screen from upgrade information.
Then the upgrade process is completed.
||
’ + ‘1472’ for input options.
3-2. How to update AUDIO MICOM program
1) Change the fi lename to download as “(MODEL NAME)_(Version).HEX”. Only upper cases are permitted.
Ex.) HT306: "HT306_0809262.HEX"
2) Copy the fi le to the root folder of USB storage.
3) Put the USB into the SET, and move to the USB function.
Then the upgradeprocess will be started with the upgrade information.
4) If the upgrade process is complete, the set will be power off automatically with “Complete” message.
1-7
SPECIFICATIONS
• GENERAL
Power requirements Refer to main label
Power consumption Refer to main label
Dimensions (W x H x D) Approx. 365 x 58.5 x 307 mm without foot
Net Weight (Approx.) 2.44 kg
Operating temperature 5 °C to 35 °C (41 °F to 95 °F)
Operating humidity 5 % to 90 %
• OUTPUTS
VIDEO OUT 1.0 V (p-p), 75 Ω, sync negative, RCA jack x 1
COMPONENT VIDEO OUT (Y) 1.0 V (p-p), 75 Ω, sync negative, RCA jack x 1
(Pb)/(Pr) 0.7 V (p-p), 75 Ω, RCA jack x 2
HDMI OUT (video/audio) 19 pin (Type A, HDMI™ Connector)
ANALOG AUDIO IN 2.0 Vrms (1 kHz, 0 dB), 600 Ω, RCA jack (L, R) x 1
PORT. IN 0.5 Vrms (3.5 mm stereo jack)
• SYSTEM
Laser Semiconductor laser, wavelength: 650 nm
Signal system Standard NTSC/PAL color TV system
Frequency response 20 Hz to 20 kHz (48 kHz, 96 kHz, 192 kHz sampling)
Signal-to-noise ratio More than 80 dB
Harmonic distortion 0.05 % at 1 W
Dynamic range More than 85 dB
Bus Power Supply (USB) DC 5 V 500 mA
• AMPLIFIER
Stereo mode 45 W + 45 W (3 Ω at 1 kHz)
Surround mode Front 45 W + 45 W (3 Ω at 1 kHz)
Center 45 W (3 Ω at 1 kHz)
Surround 45 W + 45 W (3 Ω at 1 kHz)
Subwoofer 105 W (4 Ω at 60 Hz)
• TUNER
FM Tuning Range 87.5 to 108.0 MHz or 87.50 to 108.00 MHz
• FRONT SPEAKER (LEFT/ RIGHT)
Type 1 Way 1 Speaker
Impedance Rated 3 Ω
Input Power 45 W
Max. Input Power 90 W
Net Dimensions (W x H x D) 97 x 110 x 80 mm
Net Weight 0.39 kg
• REAR SPEAKER (LEFT/ RIGHT)
Type 1 Way 1 Speaker
Impedance Rated 3 Ω
Input Power 45 W
Max. Input Power 90 W
Net Dimensions (W x H x D) 97 x 110 x 80 mm
Net Weight 0.39 kg
• CENTER SPEAKER
Type 1 Way 1 Speaker
Impedance Rated 3 Ω
Input Power 45 W
Max. Input Power 90 W
Net Dimensions (W x H x D) 97 x 110 x 80 mm
Net Weight 0.39 kg
• SUBWOOFER
Type 1 Way 1 Speaker
Impedance Rated 4 Ω
Input Power 105 W
Max. Input Power 210 W
Net Dimensions (W x H x D) 157 x 325 x 250 mm
Net Weight 3.5 kg