LG MW-30LZ10 Bedienungsanleitung PDF herunterladen (Seite 3)

-3-

SAFETY

PRECAUTIONS

Many

electrical

and

mechanical

parts

in

this

chassis

have

special

safety-related

characteristics.

These

parts

are

identified

by

in

the

Schematic

Diagram

and

Replacement

Parts

List.

It

is

essential

that

these

special

safety

parts

should

be

replaced

with

the

same

components

as

recommended

in

this

manual

to

prevent

X-RADIATION,

Shock,

Fire,

or

other

Hazards.

Do

not

modify

the

original

design

without

permission

of

manufacturer.

General

Guidance

An

lsolation

Transformer

should

always

be used

during

the

servicing

of

a

receiver

whose

chassis

is

not

isolated

from

the

AC

power

line.

Use

a

transformer

of

adequate

power

rating

as

this

protects

the

technician

from

accidents

resulting

in

personal

injury

from

electrical

shocks.

It

will

also

protect

the

receiver

and

it's

components

from

being

damaged

by

accidental

shorts

of

the

circuitary

that

may

be

inadvertently

introduced

during

the

service

operation.

If

any

fuse

(or

Fusible

Resistor)

in

this

TV

receiver

is

blown,

replace

it

with

the

specified.

When

replacing

a

high

wattage

resistor

(Oxide

Metal

Film

Resistor,

over

1W),

keep

the

resistor

10mm

away

from

PCB.

Keep

wires

away

from

high

voltage

or

high

temperature

parts.

Due

to

high

vacuum

and

large

surface

area

of

picture

tube,

extreme

care

should

be

used

in

handling

the

Picture

Tube.

Do

not

lift

the

Picture

tube

by

it's

Neck.

Before

returning

the

receiver

to

the

customer,

always

perform

an

AC

leakage

current

check

on

the

exposed

metallic

parts

of

the

cabinet,

such

as

antennas,

terminals,

etc.,

to

be

sure

the

set

is

safe

to

operate

without

damage

of

electrical

shock.

Leakage

Current

Cold

Check(Antenna

Cold

Check)

With

the

instrument

AC

plug

removed

from

AC

source,

connect

an

electrical

jumper

across

the

two

AC

plug

prongs.

Place

the

AC

switch

in

the

on

positioin,

connect

one

lead

of

ohm-meter

to

the

AC

plug

prongs

tied

together

and

touch

other

ohm-meter

lead

in

turn

to

each

exposed

metallic

parts

such

as

antenna

terminals,

phone

jacks,

etc.

If

the

exposed

metallic

part

has

a

return

path

to

the

chassis,

the

measured

resistance

should

be

between

1MΩ

and

5.2MΩ.

When

the

exposed

metal

has

no

return

path

to

the

chassis

the

reading

must

be

infinite.

An

other

abnormality

exists

that

must

be

corrected

before

the

receiver

is

returned

to

the

customer.

Leakage

Current

Hot

Check

(See

below

Figure)

Plug

the

AC

cord

directly

into

the

AC

outlet.

Do

not

use

a

line

Isolation

Transformer

during

this

check.

Connect

1.5K/10watt

resistor

in

parallel

with

a

0.15uF

capacitor

between

a

known

good

earth

ground

(Water

Pipe,

Conduit,

etc.)

and

the

exposed

metallic

parts.

Measure

the

AC

voltage

across

the

resistor

using

AC

voltmeter

with

1000

ohms/volt

or

more

sensitivity.

Reverse

plug

the

AC

cord

into

the

AC

outlet

and

repeat

AC

voltage

measurements

for

each

esposed

metallic

part.

Any

voltage

measured

must

not

exceed

0.75

volt

RMS

which

is

corresponds

to

0.5mA.

In

case

any

measurement

is

out

of

the

limits

sepcified,

there

is

possibility

of

shock

hazard

and

the

set

must

be

checked

and

repaired

before

it

is

returned

to

the

customer.

Leakage

Current

Hot

Check

circuit

1.5

Kohm/10W

To

Instrument's

exposed

METALLIC

PARTS

Good

Earth

Ground

such

as

WATER

PIPE,

CONDUIT

etc.

AC

Volt-meter

IMPORTANT

SAFETY

NOTICE

0.15uF

1 2 3 4 5 6 7 8 ... 22 23

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