LG MA-2120xx Service Manual

MICROW AVE OVEN

SER VICE MANUAL

MODEL : MA2120B

MA2120W

CAUTION

BEFORE SERVICING THE UNIT, READ THESAFETY PRECAUTIONS IN THIS MANUAL.

website http://biz.lgservice.com

This device is to be serviced only by properly qualified service personnel.
Consult the service manual for proper service procedures to assure continued safety operation and for precautions to be
taken to avoid possible exposure to excessive microwave energy.

PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE ENERGY

A) Do not operate or allow the oven to be operated with the door open.
B) Make the following safety checks on all ovens to be serviced before activating the magnetron or other

microwave source, and make repairs as necessary; (1) interlock operation, (2) proper door closing, (3)
seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and
latches, (5) evidence of dropping or abuse.

C) Before turning on microwave power for any service test or inspection within the microwave generating

compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment,
integrity, and connections.

D) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation

and transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual
before the oven is released to the owner.

E) A microwave leakage check to verify compliance with the Federal Performance Standard should be

performed on each oven prior to release to the owner.

SAFETY PRECAUTIONS

(Page)

SAFETY PRECAUTIONS

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Inside front cover

SPECIFICATIONS

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1-1

CAUTIONS

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2-1

INSTALLATIONS

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3-1

OPERATING INSTRUCTIONS

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4-1

FEATURES

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4-1

CONTROL PANEL

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4-1

OPERATING SEQUENCE

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4-2

SCHEMATIC DIAGRAM

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4-3

CIRCUIT DESCRIPTION

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4-4

SERVICE INFORMATION

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5-1

TOOLS AND MEASURING INSTRUMENTS

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5-1

MICROWAVE LEAKAGE TEST

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5-1

MEASUREMENT OF MICROWAVE POWER OUTPUT

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5-3

DISASSEMBLY AND ADJUSTMENT

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5-3

INTERLOCK CONTINUITY TEST

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5-7

COMPONENT TEST PROCEDURE

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5-8

TROUBLE SHOOTING

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5-11

EXPLODED VIEW

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6-1

REPLACEMENT PARTS LIST

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7-1

SCHEMATIC DIAGRAM OF P.C.B.

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8-1

PRINTED CIRCUIT BOARD

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8-2

P.C.B. PARTS LIST

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9-1

CONTENTS

1-1

This microwave oven is designed for household use only.
It is not recommended for commercial purposes.

ITEM

MODEL

Power Requirement

Power Output
Microwave Frequency
Magnetron
Timer
Outside Dimensions
Cavity Dimensions
Net Weight
Shipping weight
Control Complement

Nameplate Location

Accessories

DESCRIPTION

MA2120B/W

120 Volts AC 60 Hz
1,600 Watts (13.5 A)
Single phase, 3-wire grounded
1,200 Watts full microwave power (IEC60705)
2,450 MHz
2M282J
0 ~ 99 min. 99 sec.
23

7

/8” (W) x 139/16” (H) x 1813/16” (D)

17

1

/2” (W) x11” (H) x 181/2” (D)

42 lbs (approx.)
46 lbs (approx.)
Touch Control System
Clock : 1:00 - 12:59
Microwave Power for Variable Cooking
Power level

HIGH ----------------------------------------Full power throughout the cooking time
9 (Saute) -------------------------approx. 90% of Full power, 8 (Reheat) --------approx. 80%
7 (Med.-High)--------------------approx. 70%, 6 (Medium) --------approx. 60%
5 (Med.-Low) --------------------approx. 50%, 4 (Defrost) ---------approx. 40%
3 (Low) ---------------------------approx. 30%, 2 (Simmer)--------approx. 20%
1 (Warm)--------------------------approx. 10%

Owner's manual & cooking guide
Glass turntable
Rotating ring

Back Side

SPECIFICATIONS

• DO NOT operate on a 2-wire extension cord during
repair and use.

• NEVER TOUCH any oven components or wiring during
operation.

• BEFORE TOUCHING any parts of the oven, always
remove the power plug from the outlet.

• For about 30 seconds after the oven stops, an electric
charge remains in the high voltage capacitor. When
replacing or checking, you must discharge the high
voltage capacitor by shorting across the two terminals
with an insulated screwdriver.

•

Remove your watches whenever working close to or

replacing the Magnetron.

• DO NOT touch any parts of the control panel circuit. A
resulting static electric discharge may damage this
P.C.B.

• NEVER operate the oven with no load.

• NEVER injure the door seal and front plate of the oven
cavity.

• NEVER put iron tools on the magnetron.

• NEVER put anything into the latch hole and the
interlock switches area.

• Proper operation of the microwave oven requires that
the magnetron be assembled to the waveguide and
cavity. Never operate the magnetron unless it is
properly installed.

• Be sure that the magnetron gasket is properly
installed around the dome of the tube whenever
installing the magnetron.

2-1

CAUTIONS

Unlike other appliances, the microwave oven is
high-voltage and high-current equipment.
Though it is free from danger in ordinary use,
extreme care should be taken during repair.

THE OVEN IS TO BE SERVICED ONLY
BY PROPERLY QUALIFIED SERVICE
PERSONNEL.

MICROWAVE RADIATION

Personnel should not be exposed to the
microwave energy which may radiate from the
magnetron or other microwave generating
device if it is improperly used or connection.
All input and output microwave connections,
waveguide, flange, and gasket must be secure
never operate the device without a microwave
energy absorbing load attached.
Never look into an open waveguide or antenna
while the device is energized.

Gasket

ANTENNA

COOLING FIN

MAGNETRON
CHASSIS GROUND

FILAMENT
TERMINALS

MAGNETRON

INSTALLATIONS

3-1

INSTALLING

1. Empty the microwave oven and clean inside it with
a soft, damp cloth. Check for damage such as
misaligned door, damage around the door or dents
inside the cavity or on the exterior.

2. Put the oven on a counter, table, or shelf that is
strong enough to hold the oven and the food and
utensils you put in it. (The control panel side of the
oven is the heavy side. Use care when handling.)

3. Do not block the vent and the air intake openings.
Blocking vent or air intake openings can cause
damage to the oven and poor cooking results.
Make sure the microwave oven legs are in place to
ensure proper air flow.

4. The oven should not be installed in any area where
heat and steam are generated, because they may
damage the electronic or mechanical parts of the
unit.
Do not install the oven next to a conventional
surface unit or above a conventional wall oven.

5. Use microwave oven in an ambient temperature
less than 104°F (40°C).

6. Place the microwave oven on a sturdy and flat
surface at least 10 cm (4 inches) from the wall.

7. Place the microwave oven as far away as possible
from TV, RADIO, COMPUTER, etc., to prevent
interference.

GROUNDING INSTRUCTIONS

For personal safety, this appliance must be fully
grounded at all times.

In the event of an electrical short circuit, grounding
reduces the risk of electrical shock.
The plug must be plugged into an outlet that is
properly installed and grounded.

BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY.

WARNING

Improper use of the grounding plug can result in a
risk of electric shock.
Do not, under any circumstances, cut or remove
the third ground prong from the power cord plug.

PREFERRED METHOD

ENSURE PROPER GROUND

EXISTS BEFORE USE

TEMPORARY METHOD
(ADAPTER PLUGS NOT
PERMITTED IN CANADA)

ALIGN LARGE
PRONGS/SLOTS

10cm

ENSURE PROPER GROUND
AND FIRM CONNECTION
BEFORE USE

FEATURES

CONTROL PANEL

1. INDICATORS.

2. MORE / LESS: All of the one touch cook and TIMED COOK

can be adjusted to cook food for a longer or shorter time.
MORE Pressing MORE will add 10 seconds to the

cooking time.

LESS Pressing LESS will subtract 10 seconds of

cooking time.

3. ONE TOUCH CONTROL: This menu has been pre
programmed to cook food automatically by one touch.

4. Q-DEFROST: You can thaw specific foods and weight very
quickly.

5. AUTO DEFROST: This feature provides you with the best
defrosting method for frozen foods.

6. NUMBER: These used to set for time of day, cooking time,
power level, or defrost weight.

7. TIME: You can set the desired cook time.

8. CLEAR: It used to stop oven and clear all entries except

time of day.

9. START/PAUSE: This feature turns the oven on instantly.

10. DISPLAY WINDOW.

11. CLOCK: It is used to set the time of day.

12. TIMER: You can use the timer function of your oven for

purpose other than cooking.

13. POWER: You can select the desired power level for

cooking.

14. EZ ON: You can extend cooking time in multiples of

1 minute by repeatedly touching this pad during cooking.

4-1

OPERATING INSTRUCTIONS

Oven Front Plate

Window Door Screen

Door Seal

Display Window

Control Panel

Safety Door Lock System

Turntable

Rotating Ring

1

2

3

4

5

6

7

8

11

14

12

13

9

10

4-2

OPERATING SEQUENCE

The following is a description of component functions
during oven operation.

1. SETTING THE CLOCK

ex.) To set 4:30, touch number key [4],[3], and [0].

NOTE: 1) This is a 12 hour clock.

2) Clock will operate as long as power is
applied to the oven.

2. CANCEL FUNCTION

Touch the pad whenever you need to
cancel an entry or a function currently in use.
The display will return either to the last item entered
or to the clock.

3. EZ ON

4. ONE TOUCH COOKING

NOTE: Heat only 1 package at a time

5. TIME COOKING

6. MULTI-STAGE COOKING

7. AUTO DEFROST COOKING

8. CHILD LOCK

This oven has a CHILD LOCK feature

TO SET CHILD LOCK

• Touch and hold 0 pad LOCKED appears on
the display.

TO CANCEL CHILD LOCK

• Touch and hold 0 pad LOCKED
disappears.

9. MORE / LESS

The cook time is adjustable by MORE pad or LESS
pad

CLEAR CLOCK NUMBER

CLEAR POPCORN

CLEAR EZ on

CLEAR COOKING MORE

CLEAR COOKING LESS

CLEAR

1ST STAGE

CLOCK CLEAR

AUTO

DEFROST

WEIGHT

START/PAUSE

CLEAR TIME NUMBER POWER

NUMBER START/PAUSE

CLEAR TIME NUMBER POWER

NUMBER

TIME NUMBER POWER

NUMBER START/PAUSE

2ND STAGE

SCHEMATIC DIAGRAM

4-3

IMPORTANT SAFETY NOTE: THE SHADED AREAS ON THIS SCHEMATIC DIAGRAM INCORPORATE SPECIAL FEATURES

PPP IMPORTANT FOR PROTECTION FROM MICROWAVE RADIATION, FIRE, QELECTRICAL SHOCK, AND

HAZARDS. WHEN SERVICING IT IS ESSENTIAL THAT ONLY MANUFACTURER'S SPECIFIED PARTS

BE USED FOR THE CRITICAL COMPONENTS IN THE SHADED AREAS OF THE SCHEMATIC DIAGRAM.

NOTICE: SINCE THIS IS BASIC SCHEMATIC DIAGRAM, THE VALUES OF COMPONENTS AND

SOME PARTIAL CONNECTIONS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.

RD

PRIMARY

SWITCH

WH

WH

BL

WH

YL

MAGNETRON

H.V.

CAPACITOR

H.V. DIODE

FUSE

AC 120V

60Hz

L

N

MICOM CONTROLLER

F.M.

TRANSFORMER

H.V.

T.T.M.

O.L.

PT1

6

5

3

1

BK

BK

BK

PK

GN

GN

BN

SECONDARY

SWITCH

THERMOSTAT

OVEN LAMP

MONITOR SWITCH

FAN MO TOR

CN1

RY2

RY1

WH

BK

BK

** NOTE : DOOR IS OPENED.

BK : BLACK BL : BLUE YL : YELLOW RD : RED

WH : WHITE PK : PINK GN : GREEN BN : BROWN

CIRCUIT DESCRIPTION

GENERAL DETAILS

• The low voltage transformer supplies the necessary
voltage to the micom controller when power cord is
plugged in.

• When the door is closed, the primary switch is ON, the

secondary switch is ON, and the monitor switch opens
(contact COM and NO).

WHEN SELECTING COOKING POWER
LEVEL AND TIME

• 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

has been set.

WHEN TOUCHING THE START PAD

• The coil of the relay is energized by the micom

controller.

• Power input is supplied to the high voltage transformer

through the fuse to the primary switch and relay 2.

• Turntable rotates.

• The fan motor rotates and cools the magnetron by

blowing air (coming from the intake on the base-plate).

• The air is also directed into the oven to exhaust the

vapor in the oven through the upper plate.

• Cooking time starts counting down.

• 3.3 volts AC is generated from the filament winding of

the high voltage transformer. This 3.3 volts is applied to
the magnetron to heat the magnetron filament through
two noise-preventing choke coils.

• A high voltage of approximately 2100 volts AC is
generated in the secondary of the high voltage
transformer which is increased by the action of the high
voltage diode and charging of the high voltage
capacitor.

• The negative 4,000 Volts DC is applied to the filament
of the magnetron.

WHEN THE OVEN IS SET AT ANY LEVEL
EXCEPT MAXIMUM.

• The micom controller controls the ON-OFF time of
relay 2 by the applied signal to vary the average output
power of microwave oven as POWER LEVEL.
(refer to page 1-1)

• One complete cycle of the relay 2 is 22 seconds.

WHEN THE DOOR IS OPENED DURING
COOKING

• Both the primary switch and relay 2 cut off the primary
winding voltage of the high voltage transformer.

• ON-OFF of relay 2 is coupled electrically with opening
and closing of the secondary switch.

• When the door is opened, the secondary switch is
opened and when the door is closed, the secondary
switch is closed.

• The cooking time stops counting down.

• Relay stops functioning.

• As the door is opened, if the contact of primary switch
and relay 2 and/or secondary switch fail to open, the
fuse opens due to the large current surge caused by
the monitor switch activation, which, in turn, stops
magnetron oscillation.

4-4

L

FUSE

H.V.

TRANS-

FORMER

RELAY 2

MICOM CONTROLLER

SECONDARY
SWITCH

PRIMARY

SWITCH

MONITOR

SWITCH

N



PRIMARY

FUSE

L

N

SWITCH

MONITOR

SWITCH

RELAY 2

MICOM CONTROLLER

H.V.

TRANS-

FORMER

SECONDARY
SWITCH

CAUTIONS

• Be sure to check microwave leakage prior to
servicing the oven if the oven is operative prior to
servicing.

• The service personnel should inform the
manufacture importer, or assembler of any certified
oven unit found to have a microwave emission
level in excess of 5 mW/cm2and should repair any

unit found to have excessive emission levels at no cost
to the owner and should ascertain the cause of the
excessive leakage. The service personnel should
instruct the owner not to use the unit until the oven has
been brought into compliance.

• If the oven operates with the door open, the service
personnel should:

- Tell the user not to operate the oven.

- Contact the manufacturer and CDRH
(Center for Devices and Radiological Health)

immediately.

NOTE: Address on CDRH

Office of Compliance(HFZ-312)
Center for Devices and Radiological
Healthe 1390, Piccard Drive,
Rockville. MD 20850

• The service personnel should check all surface and
vent openings for microwave leakage.

• Check for microwave leakage after every servicing. The
power density of the microwave radiation leakage
emitted by the microwave oven should not exceed
4 mW/cm2. Always start measuring of an unknown field
to assure safety for operating personnel from radiation
leakage.

MEASURING MICROW A VE ENERGY
LEAKAGE

• Pour 275±15cc of 20±5°C (68±9°F) water in a beaker
which is graduated to 600 cc, and place the beaker
on the center of the turntable.

• Set the energy leakage monitor to 2,450 MHz and
use it following the manufacturer's recommended
test procedure to assure correct result.

• When measuring the leakage, always use the 2-inch
(5cm) spacer supplied with the probe.

• Operate the oven at its maximum output.

• Measure the microwave radiation using and
electromagnetic radiation monitor by holding the
probe perpendicular to the surface being measured

Move probe along shaded area

Probe scanning speed
Less than 2.5 cm/sec
(1 in/sec)

5-1

SERVICE INFORMATION

TOOLS AND MEASURING INSTRUMENTS

MICROWAVE LEAKAGE TEST

NECESSARY TOOLS

Tools normally used for TV servicing are sufficient.
Standard tools are listed below.

• Diagonal pliers

• Long nose pliers

• Phillips screwdriver

• Flat blade screwdriver

• Wrench (size 5mm)

• Nutdriver (size 5mm)

• Adjustable wrench

• Soldering iron

• Solder

• Vinyl insulation tape

• Polishing cloth

NECESSARY MEASURING INSTRUMENTS

• TESTER (VOLTS-DC, AC, Ohmmeter)

• Microwave survey meter

- Holaday HI-1500
HI-1501

- Narda 8100

8200

• Inch scale

• 600 cc non conductive material beaker (glass or plastic),
inside diameter: approx. 8.5 cm (3

1

/2

in.)

• Cylindrical and made of borosilicate glass vessel.
max. thickness: 3 mm
outside diameter: approx. 190mm
height: approx. 90mm

• Glass thermometer: 100°C or 212°F (1 deg scale)

MEASUREMENT WITH OUTER CASE
REMOVED

• When you replace the magnetron, measure for
microwave energy leakage before the outer case is
installed and after all necessary components are
replaced or adjusted.

Special care should be taken in measuring the

following parts. (Circled area of Fig. below)

- Around the magnetron

- The waveguide

MEASUREMENT WITH A FULLY
ASSEMBLED OVEN

• After all components, including the outer case, are fully
assembled, measure for microwave energy leakage
around the door viewing window, the exhaust opening,
and air inlet openings.

• Microwave energy leakage must not exceed the values
prescribed below.

NOTE: Leakage with the outer case removed less than

5 mW/cm.sq. Leakage for a fully assembled
oven (Before the latch switch (primary) is
interrupted) with the door in a slightly opened
position-less than 2 mW/cm.sq.

NOTES WHEN MEASURING

• Do not exceed meter full scale deflection.

• The test probe must be removed no faster than
1 inch/sec (2.5 cm/sec) along the shaded area,
otherwise a false reading may result.

• The test probe must be held with the grip portion of the
handle.

A false reading may result if the operator's hand is

between the handle and the probe.

• When testing near a corner of the door, keep the probe
perpendicular to the surface making sure the probe
horizontally along the oven surface; this may cause
probe damage.

RECORD KEEPING AND NOTIFICATION
AFTER MEASUREMENT

• After adjustment and repair of any microwave energy
interruption or microwave energy blocking device,
record the measured values for future reference. Also
enter the information on the service invoice.

• The microwave energy leakage should not be more
than 4 mW/cm.sq. after determining that all parts are in
good condition, functioning properly and genuine
replacement parts which are listed in this manual have
been used.

• At least once a year, have the electromagnetic energy
leakage monitor checked for calibration by its
manufacturer.

5-2

WARNING : AVOID CONTACTING ANY

HIGH VOLTAGE PARTS

SPECIAL TIP

• This oven used the button head screws.

• When you remove the screws, use
the tamper-resistant Torx driver having a
pin-in-head.

Button Head

(Torx style 2)

• Microwave power output measurement is made with
the microwave oven supplied at its rated voltage and
operated at its maximum microwave power setting with
a load of (1000±5) g of potable water.

• The water is contained in a cylindrical borosilicate glass
vessel having a maximum material thickness of 3 mm
and an outside diameter of approximately 190mm.

• The oven and the empty vessel are at ambient
temperature prior to the start of the test.

• The initial temperature (T1) of the water is (10±2)°C It
is measured immediately before the water is added to
the vessel. After addition of the water to the vessel,
the load is immediately placed on the center of the
turntable which is in the lowest position and the
microwave power switched on.

• The time T for the temperature of the water to rise by a
value ∆ T of (10±2)° is measured, where T is the time
in seconds and ∆T is the temperature rise. The initial
and final water temperatures are selected so that the
maximum difference between the final water
temperature and the ambient temperature is 5°.

• The microwave power output P in watts is calculated
from the following formula :

4187 x (∆T)

T

is measured while the microwave generator is
operating at full power. Magnetron filament heat-up
time is not included. (about 3 sec)

• The water is stirred to equalize temperature throughout
the vessel, prior to measuring the final water
temperature.

• Stirring devices and measuring instruments are
selected in order to minimize addition or removal of
heat.

A. OUTER CASE REMOVAL

1) Disconnect the power supply cord from the outlet.

2) Remove the screws from the rear of the case.
The outer case must be moved backward to be lifted
off.

B. POWER SUPPLY CORD

1) Remove the outer case.

2) Disconnect two terminals and remove one screw of
the ground terminal.

C. CONTROL PANEL ASSEMBLY

1) Open the door.

2) Disconnect the leadwire from RELAY (RY2) of the

PCB SUB ASSEMBLY.

3) Disconnect the leadwire from connector (CN1) of the
PCB SUB ASSEMBLY.

4) Lift up and pull out control panel assembly carefully

from the cavity.

CAUTION: DISCHARGE THE HIGH VOLTAGE

CAPACITOR BEFORE SERVICING

(refer to page 2-1)

5-3

WATER LOAD

TURNTABLE

MEASUREMENT OF MICROWAVE POWER OUTPUT

P =

Remove the screw

Lift up and pull out control panel

DISASSEMBLY AND ADJUSTMENT

securing
screw

ground
screw

D. PCB ASSEMBLY REMOVAL

1) Remove the control panel assembly from the
cavity. (Refer to control panel assembly removal
on previous page.)

2) Remove screws which hold the

PCB SUB

ASSEMBLY

to the control panel.

3) Disconnect the flat cable from the

PCB SUB

ASSEMBLY

and take off the

PCB SUB ASSEMBLY.

E. DOOR MAIN ASSEMBLY REMOVAL

1) Open the door.

2) Remove the choke cover very carefully with a flat-blade

screwdriver.

CAUTION: Be careful not to damage door seal plate

by screwdriver.

3) Lift up and push the door.

NOTE:

1. After replacing the door, be sure to check that the

primary switch, monitor switch, and secondary switch
operate normally.

2. After replacing the door, check for microwave energy

leakage with a survey meter. Microwave energy must
be below the limit of 4 mW/cm. (with a 275 ml water
load)

3. When mounting the door assembly to the oven

assembly, be sure to adjust the door assembly parallel
to the chassis. Also, adjust so the door has no play
between the inner door surface and oven frame
assembly. If the door assembly is not mounted
properly, microwaves may leak from the clearance
between the door and the oven.

5-4

Remove door

Remove choke cover

Spacer

Control Panel

Key Membrane

PCB Sub Asm

5-5

F. AIR DUCT ASSEMBLY REMOVAL

1) Disconnect the leadwire from the lamp.

2) Remove the mounting screw to the magnetron.

G. MAGNETRON REMOVAL

1) Disconnect the leadwire from the magnetron.

2) Carefully remove the mounting screws holding the
magnetron and the waveguide.

3) Remove the magnetron ASSEMBLY until the tube
is clear from the waveguide.

NOTE:

1. When removing the magnetron, make sure its
dome does not hit any adjacent parts, or it may be
damaged.

2. When replacing the magnetron, be sure to install
the magnetron gasket in the correct position and
be sure that the gasket is in good condition.

3. After replacing the magnetron, check for microwave
leakage with a survey meter around the
magnetron. Microwave energy must be below the

limit of 5 mW/cm2. (With a 275 ml. water load).

Make sure that gasket is rigidly attached to the
magnetron. To prevent microwave leakage,

tighten the mounting screws properly, making sure
there is no gap between the waveguide and the
magnetron.

H. REMOVING THE TURNTABLE MOTOR

1) Remove the turntable and rotating ring.

2) Lay the unit down on its back.

3) Remove the turntable motor cover.
The turntable base cover is easily removed by

pinching the eight parts with a wire cutting.

4) Disconnect the leadwire from the turntable motor

terminals.

5) Remove the screw securing the turntable motor to

the oven cavity ASSEMBLY.

6) After repairing the motor, rotate the removed

turntable motor cover.

7) Fit the turntable motor cover’s projecting part to the

base plate slit.

NOTE:

1. Remove the wire lead from the turntable motor

VERY CAREFULLY.

2. Be sure to grasp the connector, not the wires, when

removing.

Magnetron

Air Duct

Waveguide

Magnetron
Gasket

Magnetron

Dome
Waveguide

Bracket

Wire Leads

Turntable Motor

I. HIGH VOLTAGE TRANSFORMER

REMOVAL

1) Discharge the high voltage capacitor.

2) Disconnect the leadwire from magnetron, high voltage
transformer, and capacitor.

3) Remove the screw holding the high voltage
transformer to the baseplate.

J. FAN MOTOR ASSEMBLY REMOVAL

1) Discharge the high voltage capacitor.

2) Disconnect the leadwire from fan motor and high
voltage capacitor.

3) Remove the two screws holding the the suction guide
ASSEMBLY to the oven cavity.

4) Remove the two screws holding the fan motor
ASSEMBLY to the suction guide ASSEMBLY.

K. HIGH VOLTAGE CAPACITOR AND

DIODE REMOVAL

1) Discharge the high voltage capacitor.

2) Disconnect the leadwire from fan motor and high
voltage capacitor.

3) Remove the screw holding the suction guide
ASSEMBLY to the oven cavity.

4) Remove the screw holding the high voltage capacitor
bracket and remove the high voltage diode earth
screw.

L. INTERLOCK SYSTEM

1) INTERLOCK MECHANISM
The door lock mechanism is a device which has

been specially designed to eliminate completely
microwave activity when the door is opened during
cooking and thus to prevent the danger resulting
from the microwave leakage.

2) MOUNTING OF THE PRIMARY/MONITOR/
SECONDARY SWITCHES TO THE LATCH
BOARD

3) INSTALLATION AND ADJUSTMENT OF THE
LATCH BOARD TO THE OVEN ASSEMBLY

• Mount the latch board to the oven assembly.

• Adjust the latch board in the arrow direction so that

oven door will not have any play in it when the door
is closed.

• Tighten the mounting screw.

• Check for play in the door by pushing the door

release button. Door movement should be less
than 0.5 mm. (1/64 inch)

Don't push the door release button while making this

adjustment. Make sure that the latch moves
smoothly after adjustment is completed and that the
screws are tight. Make sure the primary, monitor,
and secondary switches operate properly by
following the continuity test procedure.

5-6

PRIMARY

SWITCH

SECONDARY

SWITCH

ADJUSTMENT

DIRECTION

MONITOR

SWITCH

Suction
Guide

H.V.
Transformer

Fan Motor
ASS'Y

Capacitor

H.V.

H.V.

Diode

A. PRIMARY INTERLOCK SWITCH TEST

When the door release button is depressed slowly
with the door closed, an audible click should be
heard at the same time or successively at
intervals. When the button is released slowly, the
latches should activate the switches with an
audible click.
If the latches do not activate the switches when
the door is closed, the switches should be a
adjusted in accordance with the adjustment
procedure. Disconnect the wire lead from the
primary switch. Connect the ohmmeter leads to
the common (COM) and normally open (NO)
terminal of the switch. The meter should indicate
an open circuit in the door open condition.
When the door is closed, the meter should
indicate a closed circuit.
When the primary switch operation is abnormal,
make the necessary adjustment or replace the
switch only with the same type of switch.

B. SECONDARY INTERLOCK SWITCH TEST

Disconnect the wire lead from the secondary
switch.
Connect the ohmmeter leads to the common
(COM) and normally open (NO) terminals of the
switch. The meter should indicate a open circuit in
the door open condition. When the door is closed,
meter should indicate an closed circuit. When the
secondary switch operation is abnormal, make the
necessary adjustment or replace the switch only
with the same type of switch.

C. MONITOR SWITCH TEST

Disconnect the wire lead from the monitor switch.
Connect the ohmmeter leads to the common
(COM) and normally closed (NC) terminals of the
switch. The meter should indicate closed circuit in
the door open condition. When the door is closed,
meter should indicate an open circuit. When the
monitor switch operation is abnormal, replace with
the same type of switch.

NOTE: After repairing the door or the interlock
system, it is necessary to do this continuity
test before operating the oven.

5-7

WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION

EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS.
ALL THESE SWITCHES MUST BE REPLACED AT THE SAME TIME.

TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF FOR PRIMARY SWITCH
TYPE NO. SZM-V 16-FA-62 OR VP-532A-OF FOR MONITOR SWITCH
TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF FOR SECONDARY SWITCH

COMPONENTS TEST PROCEDURE RESULTS

SWITCHES Check for continuity of the Door Door
(Wire leads removed) switch with an Ohm-meter open closed

Primary
Switch

Monitor
Switch

Secondary
Switch

NOTE : After checking for the continuity of switches, make sure that they are

connected correctly.

INTERLOCK CONTINUITY TEST

COM

COM

COM

NO

NC

NO

5-8

CAUTIONS

1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE
OUTER CASE FROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH
VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE
HIGH VOLTAGE TRANSFORMER. (SEE PAGE 2-1)

2. ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD (1 LITER
OF WATER IN CONTAINER) IN THE OVEN.

COMPONENTS TEST PROCEDURE RESULTS

HIGH VOLTAGE
TRANSFORMER
(Wire leads removed)

MAGNETRON
(Wire leads removed)

1. Measure the resistance.
(Ohm-meter scale: Rx1 and Rx100)

• Primary winding

• Secondary winding

• Filament winding

2. Measure the resistance.
(Ohm-meter scale: Rx1000)

• Primary winding to ground

• Filament winding to ground

1. Measure the resistance.
(Ohm-meter scale: Rx1)

• Filament terminal

2. Measure the resistance.
(Ohm-meter scale: Rx1000)

• Filament to chassis

Approx.: 0.2 ~ 0.4 ohm
Approx.: 60 ~ 90 ohm
Less than: 1 ohm

Normal: Infinite
Normal: Infinite

Normal: Less than 1 ohm

Normal: Infinite

PRIMARY
TERMINAL

SECONDARY

FILAMENT
WINDING

COMPONENT TEST PROCEDURE

5-9

COMPONENTS TEST PROCEDURE RESULTS

HIGH VOLTAGE
CAPACITOR

HIGH VOLTAGE
DIODE

NOTE :
Some inexpensive meters
may indicate infinite
resistance in both direction.

Measure the resistance.
(Ohm-meter scale: Rx1000)

• Terminal to terminal.

Measure the resistance.
(Ohm-meter scale: Rx1000)

• Terminal to case.

Measure the continuity (Forward).
(Ohm-meter scale: Rx10000)

Measure the continuity (Reverse).
(Ohm-meter scale: Rx10000)

Normal: Momentarily indicates

several ohms, and
then gradually returns
to infinite.

Normal: Infinite.

Normal: Continuity.
Abnormal: Infinite.

Normal: Infinite.
Abnormal: Continuity.

NOTE: When testing the magnetron, be sure to install the magnetron gasket

in the correct position and be sure that the gasket is in good condition.

Antenna
Gasket

Chassis

Filament

5-10

COMPONENTS TEST PROCEDURE RESULTS

RELAY 2

FAN MOTOR
(Wire leads removed)

TURNTABLE
MOTOR
(Wire leads removed)

Check for continuity of relay 2 with an
ohm-meter.
(Remove wire leads from relay 2 and
operate the unit.)

Measure the resistance.
(Ohm-meter scale: R x 1)

Measure the resistance.
(Ohm-meter scale: R x 1 )

POWER
LEVEL

1 4 sec 18 sec
2 6 sec 16 sec
3 8 sec 14 sec
4 10 sec 12 sec
5 12 sec 10 sec
6 14 sec 8 sec
7 16 sec 6 sec
8 18 sec 4 sec
9 20 sec 2 sec

10 22 sec 0 sec

Normal:
A: Approx. 85 ~ 100 ohm.
B: Approx. 10 ~ 25 ohm.

Abnormal: Infinite or several

ohms.

Normal: Approx.100~150 ohm
Abnormal: Infinite or several

ohm.

NOTE : • A MICROWAVE LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS

SERVICED FOR ANY REASON.

• MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITION.

• WHEN REMOVING THE WIRE LEADS FROM THE PARTS, BE SURE TO GRASP THE
CONNECTOR, NOT THE WIRES.

Relay 2

A

B

TROUBLESHOOTING

WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER, EVALUATE THE COMPLAINT CAREFULLY. IF
THE FOLLOWING SYMPTOMS APPLY, PLEASE INSTRUCT THE CUSTOMER IN THE PROPER USE OF THE
MICROWAVE OVEN. THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL.

5-11

CAUTIONS

1. Check grounding before checking for trouble.

2. Be careful of the high voltage circuit.

3. Discharge the high voltage capacitor. (See page 2-1)

4. When checking the continuity of the switches or of the high voltage transformer, disconnect one lead wire
from these parts and then check continuity with the AC plug removed. To do otherwise may result in a
false reading or damage to your meter.

5. Do not touch any part of the circuit on the PCB since static electric discharge may damage this control
panel.
Always touch yourself to ground while working on this panel to discharge any static charge built up in your
body. (Micom model only)

CONDITION

Microwave oven

does not work.

Inserting many plugs into one
outlet and using them at the
same time.
(blown fuse or breaker)

Microwave oven plug is not
inserted tightly.

Output power is too low. Low AC input voltage.

Food temperature is too low.

Using metallic ware and
allowing it to touch the oven
wall.

Sparks occur.

Inconsistent intensity of
microwave by their
characteristics.

1. Use plastic wrap or lid.

2. Stir once or twice while
cooking soup, cocoa or
milk, etc.

Uneven cooking.

Ceramic ware trimmed in
gold or silver powder is used.

Avoid using other electrical
appliances when you use the
microwave oven.

Insert microwave oven plug
securely.

Use the microwave oven at
adequate line voltage.

This may not be a defect.
It is possible that the food
should be cooked for a
longer time period.

Do not use metallic ware for
cooking except that noted in
the cooking guide.

Do not use any type of
cookware with metallic
trimming.

CAUSE REMEDY

1. Incomplete segments.

• Segment missing.

• Partial segment missing.

• Digit flickering (NOTE: Slight flickering is normal.)

2. Colon does not turn on or blink.

3. A distinct change in the brightness of one or more numbers in display.

4. One or more digits in the display are not lighting.

5. Display indicates a number different from one touched, for example, key in 5 and 3 appears in the display.

6. Specific numbers (for example 7 or 9) will not display when key pad is touched.

7. Display does not count down with time blinking or up with clock operation.

8. Display obviously jumps in time while counting down.

9. Display counts down too fast while cooking.

10. Each indicator light does not turn on after setting cooking cycle.

11. Display time of day does not reappear when cooking is finished.

5-12

(TROUBLE 1)

The following visual conditions indicate a probable defective control circuit.

CONDITION CHECK RESULT CAUSE REMEDY

1. No input can be
programmed.

Continuity

No continuity

Defective PCB
assembly.

Loose
connection.

Replace PCB
assembly.

Connect them
tightly.

Check the conn­ection between
membrane key
assembly and
PCB assembly.

2. Some inputs
cannot be
programmed.

3. Display shows a
number or figure
different from one
touched.

4. Random
programming
when touching
other pads.

5. Display is fixed
at some figure
and can not
accept any
input.

Everything works
as specified.

Still have trouble.

Defective key
membrane
assembly.

Defective PCB
assembly.

Replace key
membrane
assembly.

Replace PCB
assembly.

Replace key
membrane
assembly and
check operation.

5-13

CONDITION CHECK RESULT CAUSE REMEDY

1. Fuse blows. Continuity.

No continuity.

Continuity.

Shorted contact at
the primary switch.

Replace fuse,
primary, monitor,
secondary
switches, and
RELAY(RY2) of
P.C.B Assembly.

No continuity.

Normal.

Defective high
voltage capacitor.

Replace high
voltage capacitor.

Fuse blows again

Defective high volt­age transformer.

Replace high volt­age transformer.

Malfunction of the
monitor switch.

Replace fuse,
primary, monitor,
secondary
switches, and
RELAY(RY2) of
P.C.B Assembly.

Check continuity
of monitor
switch (with
door closed).

Check continuity
of primary
switch (with
door opened).

Disconnect one
side of the wire
lead connected
from transformer
to the high
voltage
capacitor and
operate the unit.

Replace fuse

Continuity.

Malfunction of
secondary switch.

Replace fuse,
primary, monitor,
secondary
switches, and
RELAY(RY2) of
P.C.B Assembly.

No continuity.

Check continuity
of secondary
switch (with
door opened).

2. Fuse does not
blow.

No continuity.

Continuity.

No continuity.

Defective power
supply cord.

Replace power
supply cord.

Defective
thermostat.

Replace
thermostat.

Check continuity
of thermostat.

Check continuity
of power supply
cord.

(TROUBLE 2)

Oven does not operate at all, display window does not display any figures,

and no input is accepted.

NOTE : All these switches must be replaced at the same time. Refer to page 5-7, 5-8

5-14

CONDITION CHECK RESULT CAUSE REMEDY

1. Setting time
does not count
down when
touching START
pad.

2. Fan motor or
oven lamp do
not turn on.

No continuity.

Continuity.

Continuity

Defective PCB
assembly.

Loose connection.

Replace PCB
assembly.

Connect them
tightly.

No continuity

Abnormal

Check fan motor.

Defective fan motor. Replace fan motor.

Abnormal

Normal

Check oven lamp.

Defective oven lamp. Replace oven lamp.

Defective
secondary switch.

Replace
secondary switch.

Check continuity
of secondary
switch (with
door closed).

Check the con­nection between
CN1 connector
and PCB
assembly.

(TROUBLE 3)

Display shows all figures set, but oven does not start cooking while desired

program times are set and START pad is touched.

(TROUBLE 4) Oven seems to be operating but little heat is produced in oven load.

NOTE :

Simple test of power output-conducted by heating one liter water for one min. if available.
Minimum 8.5°C temperature rise is normal condition.

CONDITION CHECK RESULT CAUSE REMEDY

Output is low

Lower than 90% of
rating voltage.

Normal

Abnormal

Defective PCB
assembly.

Replace PCB
assembly.

Normal

Abnormal

Measure the
output power.

Defective
magnetron.

Replace
magnetron.

Decrease in power
source voltage
with load.

Suggest customer
contact local
electric power
utility company
or qualified
electrician.

Check the
power source
voltage.

Disconnect the
wire leads from
relay 2 and
check on and off
time with
multitester.

5-15

CONDITION CHECK RESULT CAUSE REMEDY

No microwave
oscillation.

No continuity.

Continuity.

Abnormal

Defective high
voltage
transformer.

Replace high
voltage
transformer.

Normal

Defective PCB
assembly.

Replace PCB
assembly.

Disconnect the
wire leads from
relay 2 and
check continuity
of relay 2.
(Operate the unit)

Check high vol­tage transformer

Output is full power
when you set lower
power level.

Abnormal.

Defective PCB
assembly.

Replace PCB
assembly.

Disconnect the
wire leads from
relay 2 and check
continuity relay 2.
(Operate the unit)

Abnormal

Defective high
voltage capacitor.

Replace high
voltage capacitor.

Normal

Check high vol­tage capacitor.

Abnormal

Defective high
voltage diode.

Replace high
voltage diode.

Normal

Check high vol­tage diode.

Abnormal

Defective
magnetron.

Replace
magnetron.

Check
magnetron.

(TROUBLE 5)

No microwave oscillation even though oven lamp and fan motor run.

(Display operates properly)

NOTE : • Make sure the wire leads are in the correct position.

• When removing the wire leads from the parts, be sure to grasp the connector, not the wires.

• When removing the magnetron, be sure to install the magnetron gasket in the correct position
and in good condition.

INTERIOR PARTS

OVEN CAVITY PARTS

DOOR PARTS

LATCH BOARD PARTS

CONTROL PANEL PARTS

BASE PLATE PARTS

6-1

EXPLODED VIEW

INTRODUCTION

6-2

13552A

13213A

13352A

13581A

13720D

13806D

14970A

14026A

13536A

DOOR PARTS

6-3

24781M

23506A

23572A

268711

WTP018

23550D

CONTROLLER PARTS

6-4

33390G

WTT

020

WTT

010

WSZ

185

33112U

35889A

33052M

340511

36549S

WTP

013

For Model

MA2120B

For Model

MA2120W

OVEN CAVITY PARTS

6-5

56912B

43500A

44510A

466003

466001

466002

55262A

43501A

WSZ

085

LATCH BOARD PARTS

6-6

568771

WSZ

002

WSZ

002

WSZ

002

WSZ

002

WSZ

002

WTT

028

56411A

56930V

50

FZZA

55006F

56549F

54974S

WTT

037

55900A

56324A

54810C

WTT

028

50

CZZH

56851D

WSZ002

35012A

34930W

34810M

WSZ

002

INTERIOR PARTS

6-7

63302L

63303L

65006B

948501

63302R

56170D

WSZ002

WTT021

63303R

BASE PLATE PARTS

7-1

REPLACEMENT PARTS LIST

LOC.

NO.
*01 3828W5A2443 MANUAL,OWNERS R
*02 3828W5S2170 MANUAL,SERVICE R
*05 3850W3A377E LABEL,COOKING GUIDE R
*10 3890W3Y406B BOX,YELLOW R
13213A 3213W0A001G DOOR FRAME ASSEMBLY R
13352A 3352W1A092A FRONT SCREEN R
13536A 3536WRA001Q SEAL TAPE R
13552A 3552W1A035A CHOKE COVER R
13581A 3581W1A214M DOOR ASSEMBLY R
13720D 3720W0D151K PANEL,DOOR R
13806D 3806W2A007B DECO,DOOR R
14026A 4026W2A015A LATCH R
14970A 4970WRA001B SPRING R
23506A 3506W1A159B KEY MEMBRANE R
23550D 3550W4A029B COVER,DIGITRON R
23572A 3572W0A176B PANEL,CONTROL R
24781M 4781W1M219M CONTROLLER ASSEMBLY,MICOM R
268711 6871W1S082A PWB(PCB) ASSEMBLY,SUB R
33052M 3052W3M011F CANOPY,MICA R
33112U 3112W0U028V OUT CASE,U-BENDING R
33390G 3390W1G009C TRAY,GLASS R
340511 4051W3A001A RIVET ASSEMBLY R
34930W 4930W3B029A HOLDER,WIRE R
35012A 5012W3A020A INSULATOR R
35889A 5889W2A011B ROTATING RING ASSEMBLY R
36549S 6549W1S011A MOTOR(CIRC),SYNCHRONOUS R 6549W1S015A
43500A 3500W1A013A BOARD,LATCH R
43501A 3501W1A016M BOARD ASSEMBLY,LATCH R
44510A 4510W4A005A LEVER R
466001 6600W1K004C SWITCH,MICRO R 3B73362E
466001 6600W1K004C SWITCH,MICRO R 3B73362F
466003 6600W1K004B SWITCH,MICRO R 3B73361D
466003 6600W1K004B SWITCH,MICRO R 3B73361E
50CZZH 0CZZW1H002J CAPACITOR,DRAWING[HIGH VOLTAGE] R 0CZZW1H004C
50CZZH 0CZZW1H002J CAPACITOR,DRAWING[HIGH VOLTAGE] R 6120W3H002C
50CZZH 0CZZW1H002J CAPACITOR,DRAWING[HIGH VOLTAGE] R 6120W3H003J
50FZZA 3B74133K FUSE,DRAWING R
54810C 4810W4C003A BRACKET,CAPACITOR R
54810G 4810W2G052A BRACKET,MISC R
54974S 4974W1S010A GUIDE,SUCTION R
55006F 5006WRA002A CAP,FUSE R 5006WRA002E
55262A 5262W2A043B DUCT R
55900A 2B72125A FAN R
56170D 6170W1D023P TRANSFORMER,HIGH VOLTAGE R 6170W1D050E

PART NO. DESCRIPTION SVC ALTER

R, S: SERVICE PARTS

Buyer Buyer Model Rating Label

LGEUS MA2120B MA2120B / 01

First check the rating label on the back of oven.
and order SVC parts accoding to ECN

7-2

LOC.

NO.
56324A 6324W1A001E MAGNETRON R
56411A 2B72325H POWER CORD ASSEMBLY R 6411W1A002M
56411A 2B72325H POWER CORD ASSEMBLY R 6411W1A002L
56549F 6549W1F005B MOTOR(CIRC),FAN R 6549W1F008B
56851D 6021W3B001M CABLE ASSEMBLY R
568771 6877W1A187F HARNESS R
56912B 6912W3B002G LAMP,DRAWING R 6912W3B002Q
56930V 6930WRT001C THERMOSTAT R 6930W1A001J
56930V 6930WRT001C THERMOSTAT R 6930W3A001L
56930V 6930WRT001C THERMOSTAT R 6930WRT002C
56930V 6930WRT001C THERMOSTAT R 6930W1A003A
63302L 3302W0A014A BASE PLATE R
63302R 3302W1A046B BASE PLATE R
63303L 3303W0A010A BASE PLATE ASSEMBLY R
63303R 3303W1A040B BASE PLATE ASSEMBLY R
65006B 5006W3A016B CAP,BASE PLATE R
948501 3B72245D CUSHION R
WSZ002 1SBF0402418 SCREW TAP TITE(S),BINDING HEAD R
WSZ085 4B70188C SCREW,DRAWING R
WSZ185 1SZZW2A002A SCREW,DRAWING R
WSZ196 1SZZW2A001B SCREW,DRAWING R
WTP013 1TPL0402418 SCREW TAPPING,PAN HEAD R
WTP018 1TPL0402818 SCREW TAPPING,PAN HEAD R
WTT020 1TTL0402416 SCREW TAPPING,TRUSS HEAD R
WTT021 1TTL0402418 SCREW TAPPING,TRUSS HEAD R
WTT028 1TTL0402818 SCREW TAPPING,TRUSS HEAD R
WTT037 1TTL0403818 SCREW TAPPING,TRUSS HEAD R

PART NO. DESCRIPTION SVC ALTER

R, S: SERVICE PARTS

7-3

LOC.

NO.
**01 3828W5A3861 MANUAL,OWNERS R
*02 3828W5S2170 MANUAL,SERVICE R
*05 3850W1D057D LABEL,COOKING GUIDE R
*10 3890W3Y772B BOX,YELLOW R
13213A 3213W0A001L DOOR FRAME ASSEMBLY R
13352A 3352W1A151A FRONT SCREEN S
13536A 3536W1A009A SEAL TAPE S
13552A 3552W1A035B CHOKE COVER R
13581A 3581W1A437B DOOR ASSEMBLY R
13720D 3720W0D151M PANEL,DOOR R
13806D 3806W2A007D DECO,DOOR R
14026A 4026W2A019A LATCH R
14970A 4970WRA001B SPRING R
23506A 3506W1A159B KEY MEMBRANE R
23550D 3550W4A029L COVER,DIGITRON R
23572A 3572W0A176E PANEL,CONTROL R
24781M 4781W1M365F CONTROLLER ASSEMBLY,MICOM R
268711 6871W1S082Q PWB(PCB) ASSEMBLY,SUB R
33052A 3052W3M011F CANOPY,MICA R
33112U 3112W0U072E OUT CASE,U-BENDING R
33390G 3390W1G009D TRAY,GLASS R
340511 4051W3A001A RIVET ASSEMBLY R
34930W 4930W3B029A HOLDER,WIRE R
35012A 5012W3A020C INSULATOR R
35889A 5889W2A014A ROTATING RING ASSEMBLY R
36549S 6549W1S011B MOTOR(CIRC),SYNCHRONOUS R 6549W1S017A
36549S 6549W1S011B MOTOR(CIRC),SYNCHRONOUS R 6549W1S015A
43500A 3500W1A028A BOARD,LATCH R
44510A 4510W3A012B LEVER R
466001 6600W1K004C SWITCH,MICRO R 6600W1K001D
466001 6600W1K004C SWITCH,MICRO R 6600W1K003D
466003 6600W1K004B SWITCH,MICRO R 6600W1K003C
466003 6600W1K004B SWITCH,MICRO R 6600W1K001C
50CZZH 0CZZW1H004C CAPACITOR,DRAWING[HIGH VOLTAGE] R 6120W3H003J
50CZZH 0CZZW1H004C CAPACITOR,DRAWING[HIGH VOLTAGE] R 0CZZW1H005A
50FZZA 3B74133K FUSE,DRAWING R 3B74133H
54810C 4810W4C003B BRACKET,CAPACITOR R
54810G 4810W2G052B BRACKET,MISC R
54974S 4974W1S048B GUIDE,SUCTION R
55006F 5006WRA002D CAP,FUSE R
55262A 5208W1A034B DUCT R
55900A 5900W1A004A FAN R
56170D 6170W1D023P TRANSFORMER,HIGH VOLTAGE R
56324A 6324W1A001E MAGNETRON R

PART NO. DESCRIPTION SVC ALTER

R, S: SERVICE PARTS

7-4

LOC.

NO.
56411A 6411W1A031B POWER CORD ASSEMBLY R
56549F 6549W1F005B MOTOR(CIRC),FAN R
56851D 6021W3B001N CABLE ASSEMBLY R
568771 6877W1A538B HARNESS R
56912B 6912W3B002L LAMP,DRAWING R
56930V 6930W1A003A THERMOSTAT R 6930W1A001J
56930V 6930W1A003A THERMOSTAT R 6930WRT002F
63302L 3302W0A014B BASE PLATE R
63302R 3302W1A046E BASE PLATE R
63303L 3303W0A010C BASE PLATE ASSEMBLY R
63303R 3303W1A040E BASE PLATE ASSEMBLY R
65006B 5006W3A019A CAP,BASE PLATE R
948501 3B72244T CUSHION R
WSZ002 1SBF0402418 SCREW TAP TITE(S),BINDING HEAD R
WSZ085 4B70188C SCREW,DRAWING R
WSZ185 1SZZW2A002A SCREW,DRAWING R
WTP013 1TPL0402418 SCREW TAPPING,PAN HEAD R
WTP018 1TPL0402818 SCREW TAPPING,PAN HEAD R
WTT020 1TTL0402416 SCREW TAPPING,TRUSS HEAD R
WTT021 1TTL0402418 SCREW TAPPING,TRUSS HEAD R
WTT028 1TTL0402818 SCREW TAPPING,TRUSS HEAD R
WTT037 1TTL0403818 SCREW TAPPING,TRUSS HEAD R

PART NO. DESCRIPTION SVC ALTER

R, S: SERVICE PARTS

7-5

LOC.

NO.
*01 3828W5A2443 MANUAL,OWNERS R
*02 3828W5S2170 MANUAL,SERVICE R
*05 3850W3A377E LABEL,COOKING GUIDE R
*10 3890W3Y406A BOX,YELLOW R
13213A 3213W0A001E DOOR FRAME ASSEMBLY R
13352A 3352W1A092A FRONT SCREEN R
13536A 3536WRA001Q SEAL TAPE R
13552A 3552W1A035A CHOKE COVER R
13581A 3581W1A214L DOOR ASSEMBLY R
13720D 3720W0D151A PANEL,DOOR R
13806D 3806W2A007A DECO,DOOR R
14026A 4026W2A015A LATCH R
14970A 4970WRA001B SPRING R
23506A 3506W1A159A KEY MEMBRANE R
23550D 3550W4A029B COVER,DIGITRON R
23572A 3572W0A176A PANEL,CONTROL R
24781M 4781W1M219K CONTROLLER ASSEMBLY,MICOM R
268711 6871W1S082A PWB(PCB) ASSEMBLY,SUB R
33052M 3052W3M011F CANOPY,MICA R
33112U 3112W0U028A OUT CASE,U-BENDING R
33390G 3390W1G009C TRAY,GLASS R
33461Z 3461W1A052C CAVITY ASSEMBLY R
340511 4051W3A001A RIVET ASSEMBLY R
34930W 4930W3B029A HOLDER,WIRE R
35012A 5012W3A020A INSULATOR R
35889A 5889W2A011B ROTATING RING ASSEMBLY R
36549S 6549W1S011A MOTOR(CIRC),SYNCHRONOUS R 6549W1S015A
43500A 3500W1A013A BOARD,LATCH R
43501A 3501W1A016M BOARD ASSEMBLY,LATCH R
44510A 4510W4A005A LEVER R
466001 6600W1K004C SWITCH,MICRO R 3B73362E
466001 6600W1K004C SWITCH,MICRO R 3B73362F
466003 6600W1K004B SWITCH,MICRO R 3B73361D
466003 6600W1K004B SWITCH,MICRO R 3B73361E
50CZZH 0CZZW1H002J CAPACITOR,DRAWING[HIGH VOLTAGE] R 0CZZW1H004C
50CZZH 0CZZW1H002J CAPACITOR,DRAWING[HIGH VOLTAGE] R 6120W3H002C
50CZZH 0CZZW1H002J CAPACITOR,DRAWING[HIGH VOLTAGE] R 6120W3H003J
50FZZA 3B74133K FUSE,DRAWING R
54810C 4810W4C003A BRACKET,CAPACITOR R
54810G 4810W2G052A BRACKET,MISC R
54974S 4974W1S010A GUIDE,SUCTION R
55006F 5006WRA002A CAP,FUSE R 5006WRA002E
55262A 5262W2A043B DUCT R
55900A 2B72125A FAN R

PART NO. DESCRIPTION SVC ALTER

R, S: SERVICE PARTS

Buyer Buyer Model Rating Label

LGEUS MA2120W MA2120W / 01

First check the rating label on the back of oven.
and order SVC parts accoding to ECN

7-6

LOC.

NO.
56170D 6170W1D023P TRANSFORMER,HIGH VOLTAGE R 6170W1D050E
56324A 6324W1A001E MAGNETRON R
56411A 2B72325H POWER CORD ASSEMBLY R 6411W1A002M
56411A 2B72325H POWER CORD ASSEMBLY R 6411W1A002L
56549F 6549W1F005B MOTOR(CIRC),FAN R 6549W1F008B
56851D 6021W3B001M CABLE ASSEMBLY R
568771 6877W1A187F HARNESS R
56912B 6912W3B002G LAMP,DRAWING R 6912W3B002Q
56930V 6930WRT001C THERMOSTAT R 6930W1A003A
56930V 6930WRT001C THERMOSTAT R 6930W1A001J
56930V 6930WRT001C THERMOSTAT R 6930W3A001L
56930V 6930WRT001C THERMOSTAT R 6930WRT002C
63302L 3302W0A014A BASE PLATE R
63302R 3302W1A046B BASE PLATE R
63303L 3303W0A010A BASE PLATE ASSEMBLY R
63303R 3303W1A040B BASE PLATE ASSEMBLY R
65006B 5006W3A016B CAP,BASE PLATE R
948501 3B72245D CUSHION R
WSZ002 1SBF0402418 SCREW TAP TITE(S),BINDING HEAD R
WSZ085 4B70188C SCREW,DRAWING R
WSZ185 1SZZW2A002A SCREW,DRAWING R
WSZ196 1SZZW2A001B SCREW,DRAWING R
WTP013 1TPL0402418 SCREW TAPPING,PAN HEAD R
WTP018 1TPL0402818 SCREW TAPPING,PAN HEAD R
WTT010 1TTG0402422 SCREW TAPPING,TRUSS HEAD R
WTT021 1TTL0402418 SCREW TAPPING,TRUSS HEAD R
WTT028 1TTL0402818 SCREW TAPPING,TRUSS HEAD R
WTT037 1TTL0403818 SCREW TAPPING,TRUSS HEAD R

PART NO. DESCRIPTION SVC ALTER

R, S: SERVICE PARTS

7-7

LOC.

NO.
*01 3828W5A3861 MANUAL,OWNERS R
*02 3828W5S2170 MANUAL,SERVICE R
*05 3850W1D057D LABEL,COOKING GUIDE R
*10 3890W3Y772A BOX,YELLOW R
13213A 3213W0A001K DOOR FRAME ASSEMBLY R
13352A 3352W1A151A FRONT SCREEN S
13536A 3536W1A009A SEAL TAPE S
13552A 3552W1A035B CHOKE COVER R
13581A 3581W1A437A DOOR ASSEMBLY R
13720D 3720W0D151L PANEL,DOOR R
13806D 3806W2A007C DECO,DOOR R
14026A 4026W2A019A LATCH R
14970A 4970WRA001B SPRING R
23506A 3506W1A159A KEY MEMBRANE R
23550D 3550W4A029L COVER,DIGITRON R
23572A 3572W0A176D PANEL,CONTROL R
24781M 4781W1M365E CONTROLLER ASSEMBLY,MICOM R
268711 6871W1S082Q PWB(PCB) ASSEMBLY,SUB R
33052M 3052W3M011F CANOPY,MICA R
33112U 3112W0U072A OUT CASE,U-BENDING R
33390G 3390W1G009D TRAY,GLASS R
340511 4051W3A001A RIVET ASSEMBLY R
34930W 4930W3B029A HOLDER,WIRE R
35012A 5012W3A020C INSULATOR R
35889A 5889W2A014A ROTATING RING ASSEMBLY R
36549S 6549W1S011B MOTOR(CIRC),SYNCHRONOUS R 6549W1S017A
36549S 6549W1S011B MOTOR(CIRC),SYNCHRONOUS R 6549W1S015A
43500A 3500W1A028A BOARD,LATCH R
44510A 4510W3A012B LEVER R
466001 6600W1K004C SWITCH,MICRO R 6600W1K001D
466001 6600W1K004C SWITCH,MICRO R 6600W1K003D
466003 6600W1K004B SWITCH,MICRO R 6600W1K003C
466003 6600W1K004B SWITCH,MICRO R 6600W1K001C
50CZZH 0CZZW1H004C CAPACITOR,DRAWING[HIGH VOLTAGE] R 6120W3H003J
50CZZH 0CZZW1H004C CAPACITOR,DRAWING[HIGH VOLTAGE] R 0CZZW1H005A
50FZZA 3B74133K FUSE,DRAWING R 3B74133H
54810C 4810W4C003B BRACKET,CAPACITOR R
54810G 4810W2G052B BRACKET,MISC R
54974S 4974W1S048B GUIDE,SUCTION R
55006F 5006WRA002D CAP,FUSE R
55262A 5208W1A034B DUCT R
55900A 5900W1A004A FAN R
56170D 6170W1D023P TRANSFORMER,HIGH VOLTAGE R
56324A 6324W1A001E MAGNETRON R

PART NO. DESCRIPTION SVC ALTER

R, S: SERVICE PARTS

7-8

LOC.

NO.
56411A 6411W1A031B POWER CORD ASSEMBLY R
56549F 6549W1F005B MOTOR(CIRC),FAN R
56851D 6021W3B001N CABLE ASSEMBLY R
568771 6877W1A538B HARNESS R
56912B 6912W3B002L LAMP,DRAWING R
56930V 6930W1A003A THERMOSTAT R 6930W1A001J
56930V 6930W1A003A THERMOSTAT R 6930WRT002F
63302L 3302W0A014B BASE PLATE R
63302R 3302W1A046E BASE PLATE R
63303L 3303W0A010C BASE PLATE ASSEMBLY R
63303R 3303W1A040E BASE PLATE ASSEMBLY R
65006B 5006W3A019A CAP,BASE PLATE R
948501 3B72244T CUSHION R
WSZ002 1SBF0402418 SCREW TAP TITE(S),BINDING HEAD R
WSZ085 4B70188C SCREW,DRAWING R
WSZ185 1SZZW2A002A SCREW,DRAWING R
WTP013 1TPL0402418 SCREW TAPPING,PAN HEAD R
WTP018 1TPL0402818 SCREW TAPPING,PAN HEAD R
WTT010 1TTG0402422 SCREW TAPPING,TRUSS HEAD R
WTT021 1TTL0402418 SCREW TAPPING,TRUSS HEAD R
WTT028 1TTL0402818 SCREW TAPPING,TRUSS HEAD R
WTT037 1TTL0403818 SCREW TAPPING,TRUSS HEAD R

PART NO. DESCRIPTION SVC ALTER

R, S: SERVICE PARTS

8-1

SCHEMATIC DIAGRAM OF P.C.B.

8-2

PRINTED CIRCUIT BOARD

9-1

P.C.B. PARTS LIST

LOC.

PART NO. DESCRIPTION SPEC SVC ALTER

NO.
BZ1 6908W3YA01B BUZZER TFM-57 CW NINGBO EAST PIEZO 2048HZ 70DB 3V 0.0012 R 6908W3YA01A
C1 0CK1020K518 CAPACITOR,FIXED CERAMIC(HIGH DIELECTRIC) 10KPF D 50V K B TA26 R
C12 0CE2276H638 CAPACITOR,FIXED ELECTROLYTIC 220UF SMS,SG 25V 20% FM5 TP 5 R
C13 0CE1076D638 CAPACITOR,FIXED ELECTROLYTIC 100UF SMS,SG 10V 20% FM5 TP 5 R
C14 0CK2230K948 CAPACITOR,FIXED CERAMIC(High dielectric) 22NF D 50V 80%,-20% F(Y5V) TA26 R
C15 0CK1040K948 CAPACITOR,FIXED CERAMIC(HIGH DIELECTRIC) 0.1UF D 50V 80%,-20% F(Y5V) TA26 R
C16 0CE4766K638 CAPACITOR,FIXED ELECTROLYTIC 47UF SMS,SG 50V 20% FM5 TP 5 R
C20 0CK2230K948 CAPACITOR,FIXED CERAMIC(High dielectric) 22NF D 50V 80%,-20% F(Y5V) TA26 R
C21 0CK2230K948 CAPACITOR,FIXED CERAMIC(High dielectric) 22NF D 50V 80%,-20% F(Y5V) TA26 R
C25 0CK2230K948 CAPACITOR,FIXED CERAMIC(High dielectric) 22NF D 50V 80%,-20% F(Y5V) TA26 R
C80 0CK1020K518 CAPACITOR,FIXED CERAMIC(HIGH DIELECTRIC) 10KPF D 50V K B TA26 R
C81 0CK1020K518 CAPACITOR,FIXED CERAMIC(HIGH DIELECTRIC) 10KPF D 50V K B TA26 R
CU1 4850W4C001B CUSHION 5.0T 15W 40L RUBBER BLACK R
D1 0DSSB00083A DIODE,SWITCHING 1N4148M SINBLE TP26 DO34 50V 300MA 500MA 4NSEC 5UA R
D11 0DRSB00093A DIODE,RECTIFIERS 1N4002 SINBLE TP26 DO41 100V 1A 30A 0SEC 5UA R
D12 0DRSB00093A DIODE,RECTIFIERS 1N4002 SINBLE TP26 DO41 100V 1A 30A 0SEC 5UA R
D13 0DRSB00093A DIODE,RECTIFIERS 1N4002 SINBLE TP26 DO41 100V 1A 30A 0SEC 5UA R
D14 0DRSB00093A DIODE,RECTIFIERS 1N4002 SINBLE TP26 DO41 100V 1A 30A 0SEC 5UA R
D20 0DSSB00083A DIODE,SWITCHING 1N4148M SINBLE TP26 DO34 50V 300MA 500MA 4NSEC 5UA R
D25 0DSSB00083A DIODE,SWITCHING 1N4148M SINBLE TP26 DO34 50V 300MA 500MA 4NSEC 5UA R
D30 0DSSB00023A DIODE,SWITCHING 1N4148 SINBLE TP26 DO35 75V 300MA 500MA 4NSEC 5UA R
D31 0DSSB00023A DIODE,SWITCHING 1N4148 SINBLE TP26 DO35 75V 300MA 500MA 4NSEC 5UA R
D32 0DSSB00083A DIODE,SWITCHING 1N4148M SINBLE TP26 DO34 50V 300MA 500MA 4NSEC 5UA R
D33 0DSSB00023A DIODE,SWITCHING 1N4148 SINBLE TP26 DO35 75V 300MA 500MA 4NSEC 5UA R
D5 0DSSB00083A DIODE,SWITCHING 1N4148M SINBLE TP26 DO34 50V 300MA 500MA 4NSEC 5UA R
D80 0DSSB00083A DIODE,SWITCHING 1N4148M SINBLE TP26 DO34 50V 300MA 500MA 4NSEC 5UA R
D81 0DSSB00083A DIODE,SWITCHING 1N4148M SINBLE TP26 DO34 50V 300MA 500MA 4NSEC 5UA R
D82 0DSSB00023A DIODE,SWITCHING 1N4148 SINBLE TP26 DO35 75V 300MA 500MA 4NSEC 5UA R
D83 0DSSB00083A DIODE,SWITCHING 1N4148M SINBLE TP26 DO34 50V 300MA 500MA 4NSEC 5UA R
D84 0DSSB00083A DIODE,SWITCHING 1N4148M SINBLE TP26 DO34 50V 300MA 500MA 4NSEC 5UA R
D85 0DSSB00083A DIODE,SWITCHING 1N4148M SINBLE TP26 DO34 50V 300MA 500MA 4NSEC 5UA R
D86 0DSSB00083A DIODE,SWITCHING 1N4148M SINBLE TP26 DO34 50V 300MA 500MA 4NSEC 5UA R
DP1 6302W5A002D DIGITRON VFD25-0709 7 MS-117YT ZEC R 6302W5A002A
PT1 6010W2P037P TRANSFORMER,POWER 120V 60HZ DC 12V / AC 2.6V LGETA LEADR(=037A) R 6010W2P037A
Q10 0TR126609AA TRANSISTOR,BIPOLARS KTA1266-Y(KTA1015) KEC TP TO92 50V 150MA R 0TRAU90018A
Q11 0TR126609AA TRANSISTOR,BIPOLARS KTA1266-Y(KTA1015) KEC TP TO92 50V 150MA R 0TRAU90018A
Q20 0TR107009AD TRANSISTOR,BIPOLARS KRC 107M KEC TP TO92M 50V 100MA R 0TRAU90015A
Q30 0TR126609AA TRANSISTOR,BIPOLARS KTA1266-Y(KTA1015) KEC TP TO92 50V 150MA R 0TRAU90018A
Q31 0TR105009AD TRANSISTOR,BIPOLARS KRA105M KEC TP TO92 50V 100MA R 0TRAU90012A
Q32 0TR105009AD TRANSISTOR,BIPOLARS KRA105M KEC TP TO92 50V 100MA R 0TRAU90012A
Q50 0TR107009AE TRANSISTOR,BIPOLARS KRA107M KEC TP TO92M 50V 100MA R 0TRAU90014A
Q70 0TR107009AE TRANSISTOR,BIPOLARS KRA107M KEC TP TO92M 50V 100MA R 0TRAU90014A
Q71 0TR107009AE TRANSISTOR,BIPOLARS KRA107M KEC TP TO92M 50V 100MA R 0TRAU90014A
R1 0RN7502F408 RESISTOR,FIXED METAL FILM 75K OHM 1/6 W 1% TA26 R
R10 0RD1001F608 RESISTOR,FIXED CARBON FILM 1K OHM 1/6 W 5% TA26 R
R11 0RD1501F608 RESISTOR,FIXED CARBON FILM 1.5K OHM 1/6 W 5% TA26 R
R12 0RD1002F608 RESISTOR,FIXED CARBON FILM 10K OHM 1/6 W 5% TA26 R
R13 0RD1001F608 RESISTOR,FIXED CARBON FILM 1K OHM 1/6 W 5% TA26 R
R14 0RD0471G608 RESISTOR,FIXED CARBON FILM 4.7 OHM 1/4 W 5% TA26 R
R15 0RD0471G608 RESISTOR,FIXED CARBON FILM 4.7 OHM 1/4 W 5% TA26 R

R:SERVICE PARTS

9-2

LOC.

PART NO. DESCRIPTION SPEC SVC ALTER

NO.
R16 0RD1003G608 RESISTOR,FIXED CARBON FILM 100K OHM 1/4 W 5% TA26 R
R20 0RD1001F608 RESISTOR,FIXED CARBON FILM 1K OHM 1/6 W 5% TA26 R
R21 0RD2202F608 RESISTOR,FIXED CARBON FILM 22K OHM 1/6 W 5% TA26 R
R22 0RD1001F608 RESISTOR,FIXED CARBON FILM 1K OHM 1/6 W 5% TA26 R
R23 0RD2700G608 RESISTOR,FIXED CARBON FILM 270 OHM 1/4 W 5% TA26 R
R25 0RD4701F608 RESISTOR,FIXED CARBON FILM 4.7K OHM 1/6 W 5% TA26 R
R26 0RD4702F608 RESISTOR,FIXED CARBON FILM 47K OHM 1/6 W 5% TA26 R
R27 0RD1001G608 RESISTOR,FIXED CARBON FILM 1K OHM 1/4 W 5% TA26 R
R31 0RD1000F608 RESISTOR,FIXED CARBON FILM 100 OHM 1/6 W 5% TA26 R
R32 0RD2001G608 RESISTOR,FIXED CARBON FILM 2K OHM 1/4 W 5% TA26 R
R5 0RN4702F408 RESISTOR,FIXED METAL FILM 47K OHM 1/6 W 1% TA26 R
R50 0RD4701G608 RESISTOR,FIXED CARBON FILM 4.7K OHM 1/4 W 5% TA26 R
R55 0RD1004F608 RESISTOR,FIXED CARBON FILM 1M OHM 1/6 W 5% TA26 R
R6 0RN4702G408 RESISTOR,FIXED METAL FILM 47K OHM 1/4 W 1.00% TA26 R
R70 0RD1003F608 RESISTOR,FIXED CARBON FILM 100K OHM 1/6 W 5% TA26 R
R71 0RD1003F608 RESISTOR,FIXED CARBON FILM 100K OHM 1/6 W 5% TA26 R
R80 0RN2202G408 RESISTOR,FIXED METAL FILM 22K OHM 1/4 W 1% TA26 R
R81 0RD0102F608 RESISTOR,FIXED CARBON FILM 10 OHM 1/6 W 5% TA26 R
R82 0RN1802F408 RESISTOR,FIXED METAL FILM 18K OHM 1/6 W 1% TA26 R
R83 0RN5602F408 RESISTOR,FIXED METAL FILM 56K OHM 1/6 W 0.01 TA26 R
R84 0RN2202G408 RESISTOR,FIXED METAL FILM 22K OHM 1/4 W 1% TA26 R
R85 0RD0102F608 RESISTOR,FIXED CARBON FILM 10 OHM 1/6 W 5% TA26 R
R86 0RN1802F408 RESISTOR,FIXED METAL FILM 18K OHM 1/6 W 1% TA26 R
R90 0RN4701G408 RESISTOR,FIXED METAL FILM 4.7K OHM 1/4 W 1% TA26 R
R91 0RN4701G408 RESISTOR,FIXED METAL FILM 4.7K OHM 1/4 W 1% TA26 R
R92 0RN4701F408 RESISTOR,FIXED METAL FILM 4.7K OHM 1/6 W 1% TA26 R
R93 0RN4701F408 RESISTOR,FIXED METAL FILM 4.7K OHM 1/6 W 1% TA26 R
R94 0RN4701F408 RESISTOR,FIXED METAL FILM 4.7K OHM 1/6 W 1% TA26 R
R95 0RN4701F408 RESISTOR,FIXED METAL FILM 4.7K OHM 1/6 W 1% TA26 R
R96 0RN4701F408 RESISTOR,FIXED METAL FILM 4.7K OHM 1/6 W 1% TA26 R
RY1 6920W2D010A RELAY OJ-SS-112LM OEG 250VAC 3A 12VDC 1A NO VENTING R 6920W2D010B
RY2 6920W5A009A RELAY OMIF-S-112LM ORIGINAL 250VAC 17A 12VDC 1A NO VENT R
RY3 6920W2D010A RELAY OJ-SS-112LM OEG 250VAC 3A 12VDC 1A NO VENTING R 6920W2D010B
ZD1 0DZSB00053B DIODE,ZENERS 2CW37-5.1 SINBLE TP26 DO34 500MW 5.1V 10MA NAPF R
ZD2 0DZSB00073B DIODE,ZENERS 2CW37-7.5 SINBLE TP26 DO34 500MW 7.5V 10MA NAPF R

R: SERVICE PARTS

P/NO : 3828W5S2170

Jan., 2004

Printed in Korea