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SECTION 1
SUMMARY
CONTENTS
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS ............. 1-2
SERVICING PRECAUTIONS .................................................................................................. 1-3
THE STEPS FOR CHANGE THE OPTION CODE ........................................................... 1-4
UP-DATING PROGRAM ........................................................................................................... 1-5
SPECIFICATIONS ...................................................................................................................... 1-7
1-1
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS
IMPORTANT SAFETY NOTICE A.C. Voltmeter
This manual was prepared for use only by properly trained audio-video service
technicians.
When servicing this product, under no circumstances should the original
design be modified or altered without permission from LG Electronics
Corporation. All components should be replaced only with types identical to
those in the original circuit and their physical location, wiring and lead dress
must conform to original layout upon completion of repairs.
0.15uF
Special components are also used to prevent x-radiation, shock and fire haz- Place this probe
Good Earth Ground
ard. These components are indicated by the letter "x" included in their compo- such as the Water
on each exposed
nent designators and are required to maintain safe performance. No deviations 1500 OHM metal part.
Pipe, Conduit, etc.
are allowed without prior approval by LG Electronics Corporation.
Circuit diagrams may occasionally differ from the actual circuit used. This way, 10 WATT
implementation of the latest safety and performance improvement changes
TIPS ON PROPER INSTALLATION
into the set is not delayed until the new service literature is printed.
1. Never install any receiver in a closed-in recess, cubbyhole, or closely fitting
CAUTION: Do not attempt to modify this product in any way. Never perform
shelf space over, or close to, a heat duct, or in the path of heated air flow.
customized installations without manufacturer's approval. Unauthorized modi-
fications will not only void the warranty, but may lead to property damage or 2. Avoid conditions of high humidity such as: outdoor patio installations where
user injury. dew is a factor, near steam radiators where steam leakage is a factor, etc.
Service work should be performed only after you are thoroughly familiar with 3. Avoid placement where draperies may obstruct venting. The customer
these safety checks and servicing guidelines. should also avoid the use of decorative scarves or other coverings that
might obstruct ventilation.
GRAPHIC SYMBOLS
4. Wall- and shelf-mounted installations using a commercial mounting kit must
The exclamation point within an equilateral triangle is intended to
follow the factory-approved mounting instructions. A product mounted to a
alert the service personnel to important safety information in the
shelf or platform must retain its original feet (or the equivalent thickness in
service literature.
spacers) to provide adequate air flow across the bottom. Bolts or screws
The lightning flash with arrowhead symbol within an equilateral tri- used for fasteners must not touch any parts or wiring. Perform leakage tests
angle is intended to alert the service personnel to the presence of on customized installations.
noninsulated "dangerous voltage" that may be of sufficient magni-
5. Caution customers against mounting a product on a sloping shelf or in a tilt-
tude to constitute a risk of electric shock.
ed position, unless the receiver is properly secured.
The pictorial representation of a fuse and its rating within an equi-
6. A product on a roll-about cart should be stable in its mounting to the cart.
lateral triangle is intended to convey to the service personnel the
Caution the customer on the hazards of trying to roll a cart with small cast-
following fuse replacement caution notice:
ers across thresholds or deep pile carpets.
CAUTION: FOR CONTINUED PROTECTION AGAINST RISK
7. Caution customers against using extension cords. Explain that a forest of
OF FIRE, REPLACE ALL FUSES WITH THE SAME TYPE AND
extensions, sprouting from a single outlet, can lead to disastrous conse-
RATING AS MARKED NEAR EACH FUSE.
quences to home and family.
SERVICE INFORMATION
While servicing, use an isolation transformer for protection from AC line shock.
After the original service problem has been corrected, make a check of the fol-
lowing:
FIRE AND SHOCK HAZARD
1. Be sure that all components are positioned to avoid a possibility of adjacent
component shorts. This is especially important on items trans-ported to and
from the repair shop.
2. Verify that all protective devices such as insulators, barriers, covers, shields,
strain reliefs, power supply cords, and other hardware have been reinstalled
per the original design. Be sure that the safety purpose of the polarized line
plug has not been defeated.
3. Soldering must be inspected to discover possible cold solder joints, solder
splashes, or sharp solder points. Be certain to remove all loose foreign par-
ticles.
4. Check for physical evidence of damage or deterioration to parts and compo-
nents, for frayed leads or damaged insulation (including the AC cord), and
replace if necessary.
5. No lead or component should touch a high current device or a resistor rated
at 1 watt or more. Lead tension around protruding metal surfaces must be
avoided.
6. After reassembly of the set, always perform an AC leakage test on all
exposed metallic parts of the cabinet (the channel selector knobs, antenna
terminals, handle and screws) to be sure that set is safe to operate without
danger of electrical shock. DO NOT USE A LINE ISOLATION TRANS-
FORMER DURING THIS TEST. Use an AC voltmeter having 5000 ohms per
volt or more sensitivity in the following manner: Connect a 1500 ohm, 10
watt resistor, paralleled by a .15 mfd 150V AC type capacitor between a
known good earth ground water pipe, conduit, etc.) and the exposed metal-
lic parts, one at a time. Measure the AC voltage across the combination of
1500 ohm resistor and .15 mfd capacitor. Reverse the AC plug by using a
non-polarized adaptor and repeat AC voltage measurements for each
exposed metallic part. Voltage measured must not exceed 0.75 volts RMS.
This corresponds to 0.5 milliamp AC. Any value exceeding this limit consti-
tutes a potential shock hazard and must be corrected immediately.
1-2
SERVICING PRECAUTIONS
CAUTION: Before servicing the VCR + DVD RECODER cov- Electrostatically Sensitive (ES) Devices
ered by this service data and its supplements and addends, Some semiconductor (solid state) devices can be damaged
read and follow the SAFETY PRECAUTIONS. NOTE: if easily by static electricity. Such components commonly are
unforeseen circumstances create conflict between the fol- called Electrostatically Sensitive (ES) Devices. Examples of
lowing servicing precautions and any of the safety precau- typical ES devices are integrated circuits and some field
tions in this publications, always follow the safety precau- effect transistors and semiconductor chip components.
tions. The following techniques should be used to help reduce the
Remember Safety First: incidence of component damage caused by static electricity.
General Servicing Precautions 1. Immediately before handling any semiconductor compo-
1. Always unplug the VCR + DVD RECODER AC power cord nent or semiconductor-equipped assembly, drain off any
from the AC power source before: electrostatic charge on your body by touching a known
(1) Removing or reinstalling any component, circuit board, earth ground. Alternatively, obtain and wear a commer-
module, or any other assembly. cially available discharging wrist strap device, which
(2) Disconnecting or reconnecting any internal electrical should be removed for potential shock reasons prior to
plug or other electrical connection. applying power to the unit under test.
(3) Connecting a test substitute in parallel with an elec-
trolytic capacitor. 2. After removing an electrical assembly equipped with ES
Caution: A wrong part substitution or incorrect devices, place the assembly on a conductive surface such
polarity installation of electrolytic capacitors may result as aluminum foil, to prevent electrostatic charge buildup or
in an explosion hazard. exposure of the assembly.
2. Do not spray chemicals on or near this VCR + DVD 3. Use only a grounded-tip soldering iron to solder or unsolder
RECODER or any of its assemblies. ES devices.
3. Unless specified otherwise in this service data, clean 4. Use only an anti-static solder removal device. Some
electrical contacts by applying an appropriate contact solder removal devices not classified as "anti-static" can
cleaning solution to the contacts with a pipe cleaner, generate electrical charges sufficient to damage ES
cotton-tipped swab, or comparable soft applicator. devices.
Unless specified otherwise in this service data, lubrication
of contacts is not required. 5. Do not use freon-propelled chemicals. These can
generate an electrical charge sufficient to damage ES
4. Do not defeat any plug/socket B+ voltage interlocks with devices.
whitch instruments covered by this service manual might
be equipped. 6. Do not remove a replacement ES device from its protec-
tive package until immediately before you are ready to
5. Do not apply AC power to this VCR + DVD RECODER install it. (Most replacement ES devices are packaged with
and / or any of its electrical assemblies unless all solid- leads electrically shorted together by conductive foam,
state device heat sinks are correctly installed. aluminum foil,or comparable conductive material).
6. Always connect the test instrument ground lead to an
appropriate ground before connecting the test instrument 7. Immediately before removing the protective material from
positive lead. Always remove the test instrument ground the leads of a replacement ES device, touch the protective
lead last. material to the chassis or circuit assembly into which the
device will be installed.
Insulation Checking Procedure
Disconnect the attachment plug from the AC outlet and turn Caution: Be sure no power is applied to the chassis or
the power on. Connect an insulation resistance meter (500V) circuit, and observe all other safety precautions.
to the blades of the attachment plug. The insulation resis-
tance between each blade of the attachment plug and acces- 8. Minimize bodily motions when handling unpackaged
sible conductive parts (Note 1) should be more than 1M- replacement ES devices. (Normally harmless motion such
ohm. as the brushing together of your clothes fabric or the lifting
Note 1: Accessible Conductive Parts include Metal panels, of your foot from a carpeted floor can generate static elec-
Input terminals, Earphone jacks,etc. tricity sufficient to damage an ES device.)
1-3
UP-DATING PROGRAM
BURNING DISC