PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS
IMPORTANT SAFETY NOTICE
This manual was prepared for use only by properly trained audio-video service
When servicing this product, under no circumstances should the original design
be modified or altered without permission from LG 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.
Special components are also used to prevent x-radiation, shock and fire haz-
ard.These components are indicated by the letter “x” included in their compo-
nent designators and are required to maintain safe performance. No deviations
are allowedwithout prior approval by LG Corporation.
Circuit diagrams may occasionally differ from the actual circuit used. This way,
implementation of the latest safety and performance improvement changes into
the set are not delayed until the new service literature is printed.
CAUTION: Do not attempt to modify this product in any way. Never perform-
customized installations without manufacturer’s approval. Unauthorized mod
fications will not only void the warranty, but may lead to property damage or
Service work should be performed only after you are thoroughly familiar with
these safety checks and servicing guidelines.
The exclamation point within an equilateral triangle is intended to
alert the service personnel to important safety information in the
The lightning flash with arrowhead symbol within an equilateral
triangle is intended to alert the service personnel to the presence
of noninsulated “dangerous voltage” that may be of sufficient
magnitude to constitute a risk of electric shock.
The pictorial representation of a fuse and its rating within an equi-
lateral triangle is intended to convey to the service personnel the
following fuse replacement caution notice:
CAUTION: FOR CONTINUED PROTECTION AGAINST RISK
OF FIRE, REPLACE ALLFUSES WITH THE SAME TYPE AND
RATING AS MARKED NEAR EACH FUSE.
GROUND SUCH AS
THE WATER PIPE.
PLACE THIS PROBE
ON EACH EXPOSED
TIPS ON PROPER INSTALLATION
1. Never install any receiver in a closed-in recess, cubbyhole, or closely fitting
shelf space over, or close to, a heat duct, or in the path of heated air flow.
2. Avoid conditions of high humidity such as: outdoor patio installations where
dew is a factor, near steam radiators where steam leakage is a factor, etc.
3. Avoid placement where draperies may obstruct venting. The customer
should also avoid the use of decorative scarves or other coverings that
might obstruct ventilation.
4. Wall- and shelf-mounted installations using a commercial mounting kit must
follow the factory-approved mounting instructions. A product mounted to a
shelf or platform must retain its original feet (or the equivalent thickness in
spacers) to provide adequate air flow across the bottom. Bolts or screws
used for fasteers must not touch any parts or wiring. Perform leakage tests
on customized installations.
5. Caution customers against mounting a product on a sloping shelf or in a
tilted position, unless the receiver is properly secured.
6. Aproduct on a roll-about cart should be stable in its mounting to the cart.
Caution the customer on the hazards of trying to roll a cart with small cast-
ers across thresholds or deep pile carpets.
7. Caution customers against using extension cords. Explain that a forest of
extensions, sprouting from a single outlet, can lead to disastrous conse-
quences to home and family.
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
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
4. Check for physical evidence of damage or deterioration to parts and co
ponents, 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
6. posed 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 TRANSFORMER 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 metallic 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 re-
peat AC voltage measurements for each exposed metallic part. Voltage
measured must not exceed 0.75 volts RMS. This corresponds to 0.5 milli-
amp AC. Any value exceeding this limit constitutes a potential shock hazard
and must be corrected immediately.