LG MA8000ST Service Manual - Page 11

•

The

low

voltage

transformer

supplies

the

necessary

vo

lage

to

the

rnicorn

conlr

plugged

in.

er

when

power

cord

is

•

When

t

le

door

is

closed,

the

primary

switch

is

ON,

he

secondary

switch

is

ON,

and

the

monitor

switch

opens

(contact

COM

anc

NO).

generated

in

the

secondary

of

the

high

voltage

transformer

which

is

increased

by

the

action

of

the

high

voltage

diode

arid

charging

of

the

high

voltage

capacitor.

•

ThP

negative

4,000

Volts

DC

s

applied

to

the

filament

of

the

magnetron.

WHEN

SELECTING

COOKING

POWER

LEVEL

AND

TIME

WHEN

THE

OVEN

IS

SET

AT

ANY

LEVEL

EXCEPT

MAXIMUM.

•

The

micom

controller

memorizes

the

function

you

set.

•

The

time

you

set

appears

in

the

display

window.

•

Each

indicator

light

turns

on

to

indicate

that

the

stage

•

The

micom

controller

controls

the

ON

-OFF

time

of

has

been

set.

relay

2

by

the

applied

signal

to

vary

the

average

output

power

of

microwave

oven

as

POWER

LEVEL.

(rafartopage1-1)

•

One

complete

cycle

of

relay

2

is

22

seconds

•

The

coil

of

the

relay

is

energized

by

the

micom

contro

er

WHEN

THE

DOOR

IS

OPENED

DURING

COOKING

•

Power

input

is

supplied

to

the

high

voltage

tranislorrner

•

Both

the

primary

switch

and

relay

2

cut

off

the

primary

Tu

rntab

e

rotates

•

ON

-OFF

of

ielay

2

is

coup

ed

electiical

and

ciosing

-

of

-

the

-

secon

-

dary

switch.

y

with

opening

•

When

the

door

is

opened,

the

secondary

switch

is

opened

and

when

the

door

is

closed,

the

secondary

switch

is

closed.

MONITOR

SWITCH

HV

•

The

cooking

time

stops

counting

down.

FORMER

•

As

the

door

is

opened,

if

the

contact

of

primary

switch

0

FUSE

and

relay

2

and/or

secondary

switch

fail

to

open,

the

fusc

opens

due

to

the

large

currcnt

surgc

causcd

by

PRIMARY

i

o

_.

15

SECONDARY

SWITCH

SWITCH

RELAY

2

inn

0

0

magnetron

oscillation.

MICOM

CONTROLLER

0

1

•

The

fan

motor

rotates

and

cools

the

magnetron

by

MONITOR

SWITCH

HV

TRANS-

FORMER

baseplate).

•

The

air

is

also

directed

into

t

oven

to

ex

vapor

in

the

oven

through

the

upper

plate.

iaust

the

FUSE

0

•

Cooking

time

starts

counting

down.

•

3

2

volts

AC

is

generated

from

the

filament

winding

of

tie

hig

-

i

vo

tage

transformer

This

3

2

vo

is

is

applied

to

the

magnetron

to

heat

the

magnetron

filament

through

PRIMARY

SWITCH

RELAY

2

SECONDARY

0--15

SWITCH

ro

-

zn

0

0

preventing

MICOM

CONTROLLER

-5

LG MA8000ST Service Manual - Page 11

Selecting, Cooking, Power, Level, Except, Maximum., Opened, During

Page 11 highlights