LG MH 1357M User Manual

Website: http://biz.lgservice.com

MICROWAVE OVEN

SERVICE MANUAL

MODEL: MH-1355M

MH-1356M

MH-1357M

CAUTION

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

July, 1998

Printed in Korea

P/NO : 3828W5S6174

TABLE OF CONTENTS

SPECIFICATIONS

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CAUTIONS

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INSTALLATIONS

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FEATURE DIAGRAM

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CONTROL PANEL

HOW THE MICROWAVE/CONVECTION OVEN WORKS

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COOKING FLOW CHART

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OPERATING INSTRUCTIONS

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SCHEMATIC DIAGRAM

CIRCUIT DESCRIPTION

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DESCRIPTION AND FUNCTION OF COMPONENTS

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NECESSARY TOOLS AND MEASURING INSTRUMENTS

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INSTALLATION AND ADJUSTMENT OF THE INTERLOCK SYSTEM

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INTERLOCK CONTINUITY TEST

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DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE

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TROUBLESHOOTING

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COMPONENT TEST PROCEDURE

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PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE

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EXPLODED VIEW AND PARTS LIST

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INTRODUCTION

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1. DOOR PARTS

2. CONTROL PANEL PARTS

3. OVEN CAVITY PARTS

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4. OVEN INTERIOR PARTS (1)

5. OVEN INTERIOR PARTS (2)

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6. LATCH PARTS

7. BASE PLATE PARTS

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8. WIRING HARNESS PARTS

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9. CIRCUIT BOARD

10. CIRCUIT BOARD SCHEMATIC DIAGRAM

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REPLACEMENT PARTS LIST

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– 3 –

SPECIFICATIONS

Power Supply

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120 VAC, 60 Hz

Power Consumption

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1400 Watts (Microwave), 12A

1580 Watts (Convection), 13.2A

*850 Watts (Microwave)

1500 Watts (Convection)

2450 MHz 50 MHz

Output

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Microwave Frequency

High Voltage Capacitor

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0.91µF, 2100V AC

High Voltage Diode

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HVR-IX

Oven Lamp

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125V, 25W

Timer

Power Control

Outer Dimension

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99 mim. 99 sec. (Microwave, Convection and Combination)

MICOM

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15" x 22 / " x 19 / " (H x W x D)

Cavity Dimension

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10 / " x 14 / " x 14 / " (H x W x D)

Safety Device

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Primary Interlock Switch, Secondary Interlock Switch

Monitor Switch

Fuse 15 Amp

Magnetron Thermostat

Open at 145°C 6°C

Close at 60°C 15°C

Oven Thermostat:

Open at 130°C 6°C

Close at 60°C 15°C

✽

IEC60705 Rating Standard.

Specifications are subject to change without notice.

– 4 –

CAUTIONS

Unlike other appliances, the microwave oven is

MICROWAVE RADIATION

high-voltage and high-current equipment.

Though it is free from danger in ordinary use,

extreme care should be taken during repair.

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.

• 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.

Never look into an open waveguide or antenna

while the device is energized.

• 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.

ANTENNA

Gasket

COOLING FIN

FILAMENT

TERMINALS

MAGNETRON

CHASSIS GROUND

MAGNETRON

• Remove your watches whenever working close to or

replacing the Magnetron.

• 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.

THE OVEN IS TO BE SERVICED ONLY

BY PROPERLY QUALIFIED SERVICE

PERSONNEL.

– 5 –

INSTALLATIONS

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

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.

EARTHING INSTRUCTIONS

This microwave oven is designed to be used in a fully

earthed condition.

It is imperative, therefore, to make sure it is properly

earthed before servicing

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.)

WARNING-

THIS APPLIANCE

MUST BE EARTHED

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.

IMPORTANT

The wires in this mains lead are colored in

accordance with the following code:

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.

Green-and-yellow:

Blue:

Brown:

Earth

Neutral

Live

Do not install the oven next to a conventional

surface unit or above a conventional wall oven.

As the colors of the wires in the mains lead of this

appliance may not correspond with the colored

markings identifying the terminals in your plug,

proceed as follows.

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.

The wire which is colored green-and-yellow must be

connected to the terminal in the plug which is marked

with the letter E or by the earth symbol ( ) or

colored green or green-and-yellow.

7. Place the microwave oven as far away as possible

from TV, RADIO, COMPUTER, etc., to prevent

interference.

8. This oven must be plugged into a 15A outlet.

The wire which is colored blue must be connected to

the terminal in the plug which is marked with the letter

N or colored black.

9. Do not touch the front glass during or after cooking

of the Grill and Combination mode.

This glass is very hot during heater operating.

The wire which is colored brown must be connected

to the terminal in the plug which is marked with the

letter L or colored red.

10. Do not operate the oven at microwave and

combination mode with Grill rack placed in the

cavity when the oven is empty.

– 6 –

FEATURE DIAGRAM

AIR VENTS

SEE-THROUGH

DOOR

CONTROL PANEL

SAFETY

INTERLOCK SYSTEM

TURNTABLE

ROTATING RING ASM

CONVECTION RACK

Fig. 3

Remove your Microwave/Convection Oven and all material from the shipping carton.

Your oven will be packed with the following material:

Turntable

Rotating Ring Asm

Convection Rack

Cookbook

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1 Each

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Owner’s Manual

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Do not use this Microwave/Convection Oven for commercial purposes.

This Microwave/Convection Oven is made for household use only.

– 7 –

CONTROL PANEL

INDICATOR LIGHTS-

When cooking operations

are set, lights will go on

indicating the cycle in which

your oven is cooking.

DISPLAY WINDOW-

Used to show:

• Time of day.

• Cooking time.

• Cooking power level.

• Cooking temperature.

• It also functions as a

countdown timer or

temperature indicator

when cooking.

CONVECTION-

Used in setting

convection cooking

or pre-heat.

COMBINATION HIGH/LOW-

Used in setting combination

high or low cooking.

AUTO COOK- Used in

setting weight combination

cooking. Auto Combination

Guide is next to the pad.

REHEAT- Used to reheat

foods easily. Reheat Guides

is next to the pad.

DEFROST-

Used in setting

Auto Defrost.

POPCORN- Used to pop

pack aged popcorn.

COOK- Used to cook

foods easily. Cook

guide is next to the pad.

PLUS TIME-

Used to cook

food for a longer time

after cooking end.

MICRO TIME- Used in

setting microwave

cooking time.

MICRO POWER-

Used to select cooking

power levels.

HOLD WARM- Used to

keep the food warm.

NUMBERS-

CLOCK- Used

Used to enter the:

• Time of day.

to set the time of day.

• Cooking times.

• Cooking powers.

• Cooking temperatures.

• Weight for Auto

Combination cooking.

STOP/CLEAR- Stops the

oven and Clears all entries

except TIME OF DAY. Once

cooking has begun, however,

CLEAR will function only after

STOP has been touched.

START-

Starts the oven.

NOTE: A “beep tone” sounds when a “pad” on the control panel is touched,

to indicate a setting has been entered.

– 8 –

NOTE:

1. Beep Sound

The beep sound is activated under the following conditions.

Conditions

Beep Sound Signal

• When the control key is touched,

• When the cooking stage is changed,

• When the preheat is ended and the holding time is begun,

• When cooking is ended,

• When an error occurs,

• When foods need to be turned over during auto weight defrost or

auto weight combination operation.

2. Microwave Cooking Power

Microwave cooking power can be chosen from one of the 10 cooking powers listed below. If cooking power is

not programmed, the oven operates at cooking power HI.

Microwave

Emission Time

(sec/cycle)

Microwave

Emission Time

(sec/cycle)

Numbers

Touch Pads

Cooking

Power

Numbers

Touch Pads

Cooking

Power

OFF

100

3. Digital Readout Display

Time

Temperature

Clock

9 9 : 9 9

2 h 3 0

3 0 0 f

1 2 : 3 0

(Example: 99 min

and 99 sec)

(Example: 2 hours

and 30 min)

(Example: 300°F)

(Example: 12 hours

and 30 min)

Cooking Power

Weight

End

Error

p - 5 0

4 . 5

(Example: cooking

power 50)

(Example: 4.5 lbs)

– 9 –

HOW THE MICROWAVE/

CONVECTION OVEN WORKS

MICROWAVE COOKING

Using microwave energy only, food is cooked quickly

without altering its color or shape. The food is evenly

cooked on a rotating turntable as the microwaves are

produced by the magnetron. Power Control can be

adjusted in 10 steps, enabling the various kinds of foods

to cook at most desirable cooking power for the best

results.

Magnetron

Convection Heater

CONVECTION COOKING

This is a way of cooking with hot air from the convec-tion

heater on the back side of the unit. This method allows

food to be browned evenly without losing any of the

juices. Heated air is circulated in the oven by a fan to

enable the heating and cooking of food. Since hot air

remains in the oven as it circulates, cooking is very

efficient. The temperature inside the oven can be con-

trolled according to the type of food being cooked.

Circulation

Motor

Convection Rack

Convection Heater

COMBINATION COOKING

With microwave energy and hot air, this solid-state

control can cook alternately according to the cycles

programmed between microwave and hot air to pro-vide

efficient cooking fully utilizing the advantages of

two functions. Convection rack is also used in Combi-

nation Cooking.

Circulation

Motor

Convection Rack

Fig. 5

– 10 –

COOKING FLOW CHART

CLOCK

HOLD

WARM

AUTO

WEIGHT

STAGE 1

STAGE 2

STAGE 3

DEFROST

AUTO

WEIGHT

POPCORN

REHEAT

COMBINATION

START

Cooking procedure have five sequential programs.

AUTO WEIGHT DEFROST STAGE 1 STAGE 2

STAGE 3

HOLD WARM

Cooking program can be partially and independently selected.

Example:

AUTO WEIGHT DEFROST

STAGE 1

HOLD WARM

STAGE 2

HOLD WARM

STAGE 3

HOLD WARM

STAGE 1

HOLD WARM

STAGE 2

HOLD WARM

STAGE 3

HOLD WARM

AUTO WEIGHT COMBINATION

REHEAT

POPCORN

– 11 –

OPERATING INSTRUCTIONS

TO SET THE TIME OF DAY

“MICRO TIME” COOKING

1. When the oven is plugged in, the display window will

1. Touch MICRO TIME.

show zero( :0)

2. Touch CLOCK.

2. Touch numbers for desired cooking time.

3. Touch MICRO POWER.

3. Touch numbers for correct time of day.

4. Touch CLOCK again.

4. Touch number for desired cooking power.

5. Touch START.

NOTE:

“CONVECTION” COOKING

To Preheat

1. Touch CONVECTION.

2. Touch number for desired preheating temperature.

3. Touch START.

• If your oven does not operate properly, unplug the

oven from the 120-volt household outlet and then

plug it back in.

• To reset the time of day in the display window, touch

CLOCK again.

The colon will disappear. Enter the correct time of day

by following the above procedure.

• Oven will operate even though the TIME OF DAY is

not set.

• If the TIME OF DAY is not set, nothing will show in

the display window when STOP/CLEAR is touched.

• The TIME OF DAY can be set only from 1 : 00 to 12

: 59. At invalid setting, “E” will appear in the display

window with two short and one long beep sounds.

Only STOP/CLEAR can be operated while an error

condition exists.

• If you accidentally touch more than 4 numbers, the

last 4 numbers you have touched will appear in the

display window.

NOTE:

• After oven temperature reached the selected

temperature, the oven will automatically begin to hold

operation at the preheat temperature for 30 minutes.

To Cook

1. Touch CONVECTION.

2. Touch number for desired oven temperature.

3. Touch numbers for desired cooking time.

4. Touch START.

NOTE:

• If a momentary power failure occurs, the clock display

returns to zero ( : 0). If this occurs, please reset the

clock.

• Convection cooking temperatures range from 225°F

to 450°F.

• When oven doesn't reach selected temperature, oven

temperature will appear in the display window.

Current temperature of oven will be displayed in rising

5°F increments. If oven temperature is lower than

200°F, the display window will show "LO F" until

oven temperature reaches 200°F.

• If STOP/CLEAR is touched or door is opened after

cooking, the TIME OF DAY will appear in the display

window.

• If you don't set the time of day, the display counts

up per minute.

REGULAR TIMER

1. Touch MICRO TIME.

2. Touch numbers for desired time.

3. Touch MICRO POWER.

4. Touch “0”

5. Touch START.

– 12 –

NOTE:

“COMBINATION” COOKING

• If you input over the acceptable weight, "E" will show

in the display window. It means error and the oven

does not operate.

• When five short beeps sound during cooking, please

turn over foods.

1. Touch COMBINATION HIGH or LOW.

2. Touch numbers for desired cooking time.

3. Touch START.

• Don't cook with plugging in the temperature probe.

• If you touch Auto Weight Combination Cook key, the

cooking data input already in each stage is cancelled.

• If you are going to reprogram a certain cooking

function after programming Auto Weight Combination

data, STOP/CLEAR must always be touched before.

• Weight can be programmed in pounds and tenths of

a pound. Categories for Auto Weight Combination

Cooking and the maximum weights are 5.9 lbs.

NOTE:

• Output is fixed as follows.

MICROWAVE

COOKING TIME COOKING TIME

CONVECTION

COMBI-HIGH

COMBI-LOW

8 Sec

14 Sec (375°F)

14 Sec (350°F)

“REHEAT”

1. Touch REHEAT.

“AUTOMATIC DEFROST BY WEIGHT”

1. Touch MEAT, POULTRY or FISH of AUTO WEIGHT

2. Touch REHEAT repeatedly for desired category of

Reheat. (Touch 1. or 2)

DEFROST.

2. Touch numbers for desired weight.

3. Touch START.

NOTE:

• If you touch Reheat key, the cooking data input

already in each stage is cancelled.

• If you reprogram a certain cooking function after

programming Reheat data, STOP/CLEAR must

always be touched before.

• If you input over the acceptable weight, "E" will show

in the display window. It means error and the oven

does not operate.

• When five short beeps sound during Auto Weight

Defrost, please turn over foods.

• Each category can defrost food with the weight of the

defrosting food input. The cooking power will

automatically be fixed in proportion to the time.

Categories for Auto Weight Defrost and the maximum

weights are 9.9 lbs.

“HOLD WARM”

1. Touch HOLD WARM.

2. Touch START.

NOTE:

• The time of HOLD WARM is 60 minutes.

• With temperature probe foods will be held at

120°F.

• Take care that the temperature probe is not removed

from foods.

“AUTOMATIC COMBINATION”

COOKING

1. Touch AUTO COOK.

2. Touch number for desired category.

3. Touch numbers for desired cooking weight.

4. Touch START.

– 13 –

To Cancel Child Lock

1. Touch “0” more than 2 seconds.

“POPCORN”

1. Put a micro-proof rack on the turntable.

2. Touch POPCORN.

3. Touch START.

NOTE:

• When you cancel Child Lock, STOP/CLEAR must

always be touched before selection.

NOTE:

• If additional time is required, micro HI power in

increments of 20 sec.

MULTI-STAGE COOKING

Let’s start to cook with a first stage 4 minutes at the

cooking power HI followed by a second stage of 10

minutes at cooking power 60.

• Elevate popcorn packages on a micro-proof rack.

• Do not leave oven unattended while popping corn.

• This feature can only be used for popping

packaged.

1. Touch MICRO TIME.

2. Touch “4”, “0” and “0” in sequence.

3. Touch MICRO TIME.

4. Touch “1”, “0”, “0” and “0” in sequence.

5. Touch MICRO POWER.

6. Touch “6”.

CHILD LOCK

To Set Child Lock

1. Touch “0” more than 2 seconds.

NOTE:

7. Touch START.

• When Child Lock is selected STOP/CLEAR must

always be touched before selection.

• At this time, the oven will operate normally but Micro

Power and Heater Power will be zero and cooking

can not take place.

NOTE:

• There are three memory stages.

• At this time, if you start to cook “L” will appear in the

display window for 1 sec at first.

– 14 –

SCHEMATIC DIAGRAM

SYSTEM 1: STAND-BY CONDITION

Set up:

Door is opened. Oven power cord is plugged into standard 120 volt ground outlet.

Normal operation

• Oven light turns on.

THERMOSTAT

(OVEN)

FUSE

OVEN LAMP

TURNTABLE MOTOR

REL A Y3

REL A Y4

FAN MOTOR

CIRCULATION MOTOR

RECTIFIRE FUSE

CONVECTION HEATER

1 2 3

REL AY2

MONITOR SWITCH

HIGH VOLTAGE

DIODE

MAGNETRON

Fig. 6

– 15 –

SYSTEM 2: MICROWAVE COOKING CONDITION

Set up:

Door is closed. START is touched.

Normal operation

• Oven light turns on.

• Turntable operates.

• Fan motor operates.

THERMOSTAT

(OVEN)

FUSE

OVEN LAMP

TURNTABLE MOTOR

REL A Y3

REL A Y4

FAN MOTOR

CIRCULATION MOTOR

RECTIFIRE FUSE

CONVECTION HEATER

1 2 3

REL AY2

MONITOR SWITCH

HIGH VOLTAGE

DIODE

MAGNETRON

Fig. 7

– 16 –

SYSTEM 3: CONVECTION COOKING CONDITION

Set up:

Door is closed. START is touched.

Normal operation

• Oven light turns on.

• Turntable operates.

• Fan motor and circulation motor operate.

THERMOSTAT

(OVEN)

FUSE

OVEN LAMP

TURNTABLE MOTOR

REL A Y3

REL A Y4

FAN MOTOR

CIRCULATION MOTOR

RECTIFIRE FUSE

CONVECTION HEATER

REL AY2

MONITOR SWITCH

1 2 3

HIGH VOLTAGE

DIODE

MAGNETRON

Fig. 8

– 17 –

CIRCUIT DESCRIPTION

• The low voltage transformer supplies the necessary

voltage to the micom controller when power cord is

plugged in.

• As the door is opened, the contact of MONITOR

SWITCH short. This switch creates the short circuit

to blow 15 A fuse during operation under abnormal

condition. (i.e. should the contacts of primary switch

and relay and/or secondary switch fail to open the

circuit).

WHEN THE OVEN IS SET AT SOME COOKING

POWER EXCEPT MAX. COOKING POWER.

• Micom controller controls the ON-OFF time of the

RELAY by the applied gets signal to vary the aver-

age output power of microwave oven from “COOK-

ING POWER 10” to “COOKING POWER HI”.

• One complete cycle of Relay is 22 seconds.

WHEN THE DOOR IS OPENED DURING COOKING.

• Both primary switch and relay open to cut off

primary winding voltage to the high voltage trans-

former.

• ON-OFF of relay is coupled electrically with open

and close of secondary switch.

• When the door is opened, secondary switch is

closed and when the door is closed, secondary

switch is opened.

• Function indicator light and colon turn off and dis-

play stops counting down.

WHEN COOKING POWER AND COOKING TIME

ARE SET BY TOUCHING THE TIME AND THE

POWER PAD

• The micom controller memorizes the function you

set.

• The time or cooking power you set appears in the

dispaly window.

• Each indicator light turns on to indicate that stage

has been set.

• Relay stops functioning.

WHEN TOUCHING THE START PAD WITH THE

MICROWAVE FUNCTION SELECTED.

• As the door is opened, if the contact of primary

switch and relay and/or secondary switch fail to

open, the 15 A fuse opens due to the large current

surge caused, by the monitor switch activation and

then stops magnetron oscillation.

• The oven lamp, fan motor and turntable motor oper-

ate by closing the relay 3 and primary switch.

• The 120 Volts AC is supplied to the high voltage

transformer through the contact of the relay 1 and

primary switch. 3.5 Volt AC generated from the fila-

ment (winding of the high voltage transformer

applied to the magnetron to heat magnetron fila-

ment) through two noise suppression chock coils.

A high voltage 2100 Volts AC is generated in the

secondary winding of the high voltage transformer

and this secondary voltage is increased by action of

the diode and charging of the high voltage capacitor.

This resultant is then applied to the magnetron via

the filament.

• The disturbance wave generated by the magnetron

is suppressed by the choke coils, filter capacitors

and the magnetron shielded case, so that TV and

RADIO programs are not impaired by noise.

WHEN TOUCHING THE START PAD WITH THE

CONVECTION COOKING FUNCTION SELECTED.

• Relay 2 is closed to provide a current path to the

Convection Heater.

• The microwave does not emit with Relay 1 open.

• The Relay 3, 4 and primary switch are closed to

provide a current path to the oven lamp, the turn-

table motor, the fan motor and the circulation motor.

– 18 –

MAGNETRON WITHOUT MAGNETIC FIELD

ANTENNA

MAGNETRON TUBE

• The magnetron tube is the heart of the microwave

oven. It is basically a diode with the addition of a

magnetic field. The magnetron tube assembly con-

sists of cylindrical cathode (negative) terminal,

enclosed within a cylindrical anode (positive) termi-

nal, evacuated of all air, and surrounded by a perma-

nent magnet.

CATHODE

ELECTRONS

• In order to create an electron flow from cathode to

anode, the cathode must be heated and a potential

difference must exist between the two. This is

accomplished by heating the cathode with 3.15 VAC

(from the filament winding of the high voltage trans-

former), and applying a negative 4000 VDC (from

the voltage doubler circuit) to the cathode.

ANODE

• Originally, the electrons would travel in a straight

line from the cathode to the anode (see Fig. 9).

However, with the addition of a permanent magnet

surrounding the anode creating a magnetic field, the

electrons travel an orbital path between the cathode

and anode (see Fig. 10). As the electrons approach

the anode, their orbital path takes them past small

resonant cavities that are part of the anode. The

passing notion of the electrons induces electron cur-

rent to oscillate in the resonant cavities at the very

high frequency or 2,450 megahertz. This RF energy

is then transferred to the antenna.

Fig. 9

MAGNETRON WITH MAGNETIC FIELD

2,450 MHz.

ANTENNA

ELECTRONS

CATHODE

TESTING MAGNETRON TUBE

• Disconnect power, remove the wrapper, and dis-

charge the capacitor.

• Remove the two leads from the magnetron ter-

minals.

• Connect the ohmmeter between one terminal of the

magnetron and the outer case of the magnetron. If

the ohmmeter reads infinity, go to below. If the ohm-

meter reads less than infinity, the magnetron is

shorted.

• Connect an ohmmeter across the terminals of the

magnetron. The ohmmeter should read less than

one ohm. If the ohmmeter reads over one ohm or

infinity, the tube is defective.

ANODE

PERMANENT

MAGNET

Fig. 10

– 19 –

DESCRIPTION AND FUNCTION OF COMPONENTS

OVEN LAMP

The oven lamp illuminates the interior of the oven

during cooking so that food can be seen without

opening the door.

The oven lamp will turn off when the cooking time is

ended.

PRIMARY AND SECONDARY INTERLOCK

SWITCHES (FIG. 11)

The primary interlock switch is mounted in the latch

board-U and secondary interlock switch is mounted in

the latch board-L.

When the door is closed, the switches are activated by

the latch on the door. When the door is opened, the

switches interrupt the circuit to all components except

the oven lamp.

TURNTABLE MOTOR

The turntable motor rotates the turntable located on

the bottom of the oven cavity during the cooking

operation to cook the foods evenly.

MONITOR SWITCH (FIG. 11)

The monitor switch, mounted on the latch board-L with

the oven lamp switch, is activated by a latch on the

door while the door is closed.

Turntable will rotate in either direction.

OVEN THERMOSTAT

The oven thermostat located on the insulator-T, is

designed to prevent damage to the components and

acts when heater overheats to abnormally high tem-

peratures. Under normal convection operation, the

heater thermostat remains closed. However, when

abnormal condition within the convection chamber

approaches a critical level (130°C), the oven ther-

mostat will open and interrupt the circuit to the oven,

causing it to shut down.

If the door is opened and the primary and secondary

interlock switch contacts fail to open, this switch is

intended to render the oven inoperative by means of

fuse failure, simultaneously with the closing of monitor

switch contacts.

OVEN LAMP SWITCH (FIG. 11)

The oven lamp switch mounted on the latch board-L

with monitor switch, is activated by latch on the door

while the door is closed.

MAGNETRON THERMOSTAT

The magnetron thermostat located on the magnetron,

is designed to prevent damage to the magnetron if an

overheated condition develops in the tube due to

abnormal state.

The magnetron thermostat remains closed under nor-

mal operation, but the magnetron thermostat opens

when abnormal high temperatures within the magne-

tron approach a critical level (145°C), causing oven to

shut down.

PRIMARY SWITCH

OVEN LAMP

SWITCH

DOOR OPENING MECHANISM

The door can be opened by pushing button and lifting

the latch as a result of action by the latch spring, latch

and latch board jaw. The latch is released from the

latch board and the door can be opened.

MONITOR

SWITCH

SECONDARY

SWITCH

Fig. 11

– 20 –

CONVECTION COOKING SYSTEM (FIG. 12)

CHAMBER ASSEMBLY (FIG. 12)

Convection cooking is not performed by direct heat

from the heating elements, but by forced circulation of

the hot air produced by the heating elements located

at the back side of the oven cavity.

The air heated by the heating element is circulated

through the convection passage provided on the back

side of the oven by means of the convection fan which

is driven by the convection motor. It then enters the

inside of oven through the vent holes provided on the

rear of the oven cavity. Next, the hot air heats up the

food on the turntable and leaves the oven cavity

through the vent in the centre of the oven cavity rear

wall.

The air heated by the heating elements (heater) is

circulated through the convection chamber of the

oven cavity by means of the circulation fan which is

driven by the circulation motor.

Then the hot air enters the inside of oven through the

vent holes provided in the back plate of the oven

cavity. Next the hot air heats up the food on the turn-

table and leaves the oven cavity through the vent in

the centre of the oven cavity back side. In a continuous

cycle, this hot air is reheated by the heater, passes

through the back chamber (convection chamber) and

enters the inside of the oven cavity again. In this way,

the hot air raises inside air temperature of the oven

cavity and thus the food is being cooked. Convection

heater will heat continuously before the setting tem-

perature is reached, and alternates on and off accord-

ing to temperature after the setting temperature is

reached.

Without leaving the oven, this hot air is reheated by

the heating element, passes through the convection

passage and enters the inside of the oven cavity

again, in a continuing cycle.

DAMPER OPERATION

When the oven starts convection and combination

function, damper bracket is pulled by solenoid so that

the hot air does not leave the cavity.

When the function is microwave, the power supply to

the solenoid is turn off and damper spring push the

damper bracket so that the fan circulate the air within

the cavity.

The on/off of the convection heater is controlled by

thermistor.

CONVECTION

HEATER

CIRCULATION FAN

FOOD

CONVECTION RACK

Fig. 12

– 21 –

NECESSARY TOOLS AND

MEASURING INSTRUMENTS

NECESSARY TOOLS

NECESSARY MEASURING INSTRUMENTS

Tools normally used for TV servicing are sufficient.

Standard tools are listed below.

• Diagonal pliers

• Tester (Volt DC, AC-ohmmeter)

• Inch scale

• Electromagnetic radiation monitor

• 600 cc glass beaker or equivalent

• Glass thermometer 100°C

• Two 1 liter beakers or equivalent

• Long nose pliers

• Cross head screwdriver

• Socket wrench (size 5 mm)

• Nutdriver (size 5 mm)

• Adjustable wrench

• Soldering iron

• Solder

• Vinyl insulation tape

• Polishing cloth

– 22 –

INSTALLATION AND ADJUSTMENT OF

THE INTERLOCK SYSTEM

A. INSTALLATION

CAUTION: FOR CONTINUED PROTECTION AGAINST RADIATION EMISSION,

REPLACE ONLY WITH THESE TYPES OF SWITCHES.

PRIMARY (INTERLOCK) SWITCH; SZM-V16-FA-63 or VP-533A-OF

SECONDARY (INTERLOCK) SWITCH; SZM-V01-FA-33

(INTERLOCK) MONITOR SWITCH; SZM-V16-FA-62 or VP-532A-OF

OVEN LAMP SWITCH; SZM-V6-FA-31 or VP-331A-OD

LATCH

The installation of PRIMARY, SECONDARY, MONI-

FRONT PLATE

LATCH BOARD-U

TOR and OVEN LAMP SWITCH is as shown Fig. 13.

②

④

⑤

①

③

PROCEDURE

B. ADJUSTMENT PROCEDURE

PRIMARY

SWITCH

TO AVOID POSSIBLE EXPOSURE TO MICRO-

WAVE ENERGY LEAKAGE, THE FOLLOWING

ADJUSTMENT OF THE INTERLOCK SWITCHES

SHOULD BE MADE ONLY BY AUTHORIZED

SERVICE PERSONNEL.

LATCH BOARD-L

OVEN LAMP

SWITCH

(1) Loosen the two screws (1) holding the latch

board-U to the oven cavity front flange.

(2) With the door closed, adjust the latch board by

moving it back and forth, or up and down.

(3) Secure the screws firmly.

(4) Loosen the two screws (3) holding the latch

board-L to the oven cavity front flange.

MONITOR

SWITCH

(5) With the door closed, adjust the latch board by

moving it back and forth, or up and down.

(6) In and out play of the door allowed by the latch

board U and L should be less than 0.5 mm.

(7) Secure the screws firmly.

SECONDARY

SWITCH

SWITCH LEVER

Fig. 13

– 23 –

After the adjustment, make sure to perform the following test. This test should only be performed by authorized

service personnel.

(1) The in and out play of the door must be less than

0.5mm when latched. First check the latch board-U

position, pushing and pulling the upper portion of

door toward the oven face. Then check the lower

portion of door toward the oven face. Both results

should be less than 0.5mm.

This (COM-NO) test should be performed with the

door being opened very slowly.

(3) Re-install the outer case and check for microwave

leakage. Makes sure the microwave leakage is

below the limit of 4mW/cm²(with a 275 ml water

load.)

(2) Make sure the door latch closes the monitor switch

and oven lamp switch after the primary switch is

open.

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

SERVICED, FOR ANY REASON.

– 24 –

INTERLOCK CONTINUITY TEST

• The service personnel should replace all of the monitored safety interlock switches and monitor switch if the

oven has been rendered inoperative due to the failure of the monitored safety interlock(s).

• Be sure to connect the monitor switch after replacement and to check interlock/monitor continuity.

COMPONENTS

TEST PROCEDURE

RESULTS

SWITCHES

(Wire leads removed)

Check for continuity of the switch

with an Ohm-meter

Door

open

Door

closed

Primary

COM

Switch

Monitor

COM

Switch

Secondary

COM

Switch

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

correctly connected.

PRIMARY INTERLOCK (UPPER LATCH)

SWITCH TEST

SECONDARY INTERLOCK (LOWER

LATCH) SWITCH TEST

When the door button is slowly depressed with the

door closed, an audible “click” should be heard at

the same time or successively at intervals. When the

button is slowly released, 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 adjusted in

accordance with adjustment procedure.

Isolate the primary switch by disconnecting it from

leadwire. Connect the ohmmeter leads to the common

(COM) and normally open (NO) terminal of the switch.

The meter should indicate an open circuit in door

open condition.

Isolate the secondary switch by disconnecting it from

leadwire. Connect the ohmmeter leads to the common

(COM) and normally open (NO) terminals of the

switch. The meter should indicate a closed circuit in

the door open condition. When door is closed, the

meter should indicate an open circuit. When the

secondary switch operation is abnormal, make the

necessary adjustment or replace the switch only with

the same type of switch.

MONITOR SWITCH TEST

Isolate the monitor switch by disconnecting it from

leadwire. Connect the ohmmeter leads to the common

(COM) and normally closed (NC) terminals of the

switch. The meter should indicate a closed circuit in

the door open condition. When door is closed, the

meter should indicate an open circuit.

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.

When the monitor switch operation is abnormal,

replace 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.

– 25 –

DISASSEMBLY AND PARTS REPLACEMENT

PROCEDURE

CAUTION

Before touching any oven component or wiring, first of all, disconnect the power supply cord and wait for about

5 minutes (in order to discharge the high voltage capacitor).

A. REMOVING OUTER CASE (FIG. 14)

(1) Remove four screws from the side section.

(2) Remove seven screws from the rear section.

(3) Push the outer case back about 1 inch (3cm)

to free it from the front plate.

(4) Lift the case from the set.

B. REMOVING CONTROL PANEL ASSEM-

BLY AND PCB ASSEMBLY (FIG. 15)

Fig. 14

(1) Disconnect the wire leads (from relay 3, 4),

power trans connector (5-pin), thermistor con-

nector (2-pin), temperature probe jack connec-

tor (8-pin) and I/O connector (5-pin).

(2) Remove one screw securing the P.C.B. earth

wire lead and key pad earth bend to the front

plate.

KEY PAD

PCB SUB

ASM

(3) Remove two screws securing the control panel

to the front plate.

(4) Lift the control panel slightly and remove from

the front plate.

(5) Remove the F.P.C. connector the terminal

socket.

(6) Remove three screws securing the P.C.B.

assembly to the control panel.

NOTE:

Remove the wire leads and connector VERY

CAREFULLY Be sure to grasp the connector and

not the wires.

CONTROL PANEL

RELEASE BUTTON

Fig. 15

C. REMOVING DOOR ASSEMBLY (FIG. 16)

(1) Remove three tap tite screws securing the

hingeplate-U to the hinge supporte.

HINGE PLATE-U

(2) To remove the door, tilt the top of the door

towards you and lift the door up.

NOTES:

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

the primary switch, monitor switch, oven lamp

switch and secondary switch operate normally.

2. After replacing the door, check for microwave

energy leakage with a survey meter.

(Refer to the test procedure on page 43.)

Fig. 16

– 26 –

D. REMOVING MAGNETRON (FIG. 17)

E. REMOVING COOLING FAN MOTOR

(FIG. 17)

(1) Disconnect the wire leads from the magnetron

terminals.

(2) Remove the two screws holding the air duct to

magnetron.

(3) Remove four screws securing the magnetron to

the wave guide.

(1) Remove the power supply cord from the oven

and disconnect lead wire from the Fuse

Holder.

(2) Disconnect each two lead wires from the Fan

Motor.

(3) Remove three screws securing the Fan Guide

Asm to the back cover and lift up the Fan Guide

Asm.

(4) Remove two screws securing the Fan Motor to

the Fan Guide after pulling out the fan from the

Fan Motor.

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.

F. REMOVING HIGH VOLTAGE DIODE AND

HIGH VOLTAGE CAPACITOR. (FIG. 18)

(1) Disconnect lead wires from H.V. Trans and

Magnetron.

(2) Remove one screw securing the capacitor

bracket and one lead wire of H.V. Diode to the

base plate.

(3) Pull the Capacitor Bracket upwards.

FAN GUIDE ASM

FAN MOTOR

WAVE GUIDE

Fig. 17

MAGNETRON

– 27 –

G. REMOVING HIGH VOLTAGE

TRANSFORMER (FIG. 18)

H.V. TRANSFORMER

H.V. CAPACITOR

(1) Disconnect the wire leads from the trans-

former to the magnetron and H.V. Capacitor.

(2) Remove four screws securing the H.V. Trans-

former to the base plate.

(3) Tilt the top of the H.V. Transformer towards

you, pull slightly and lift it up.

BRACKEY

H.V. DIODE

H.V. CAPACITOR

Fig. 18

H. REMOVING TURNTABLE MOTOR

(FIG. 19, 20, 21)

(1) Remove the turntable, the rotating ring and the

turntable shaft. (Fig. 19)

(7) After repairing the motor, rotate the removed

turntable motor cover. (Fig. 20)

(2) Lay the set down on its back.

(8) Fit the turntable motor cover’s projecting part

to the base plate’s slit. (Fig. 21)

(3) Remove the turntable motor cover of the

baseplate. The turntable motor cover is easily

removed by pinching the six parts with a wire

cutter. (Fig. 20)

(4) Disconnect the lead wires from the turntable

motor terminals.

(5) Remove two screws securing the turntable

motor to the oven cavity assembly.

(6) Lift the turntable motor.

NOTE:

1. Remove the lead wire from the turntable motor

VERY CAREFULLY with long nose pliers.

2. Be sure to grasp the connector, and not the

wires when removing.

3. In assembling, insert the slit part of turntable

motor cover and secure it by using two screws.

Fig. 19

Fig. 20

Fig. 21

– 28 –

I. REMOVING CIRCULATION MOTOR

(FIG. 22)

K. REMOVING PRIMARY INTERLOCK

SWITCH (FIG. 23)

(1) Disconnect the wire leads from the circulation

motor terminal.

(2) Remove the screws securing the supporter

bracket, insulator-R and the chamber gross

assembly to the oven cavity.

(1) After removing the complete control pane

assembly, disconnect the wire leads from the

switches.

(2) Remove two screws holding the latch board-U

to the front plate flange.

(3) To remove the chamber gross assembly, lift the

chamber gross assembly up.

(4) Remove one hex nut securing the circulation

fan to shaft of the circulation motor.

(3) Remove the latch board-U from the flange by

moving it upward and push outward.

(4) Remove one screw securing primary switch to

the latch board-U.

(5) Remove three screws securing the motor

bracket to the chamber.

(5) Remove the switch from the latch board-U.

(6) Remove two hex nuts securing the circulation

motor to the motor bracket.

L. REMOVING SECONDARY INTERLOCK

SWITCH, MONITOR SWITCH AND OVEN

LAMP SWITCH (FIG. 23)

J. REMOVING CONVECTION HEATER AND

THERMISTOR (FIG. 22)

(1) Disconnect the wire leads from the switches.

(2) Remove two screws holding the latch board-L

to the front plate flange.

CONVECTION HEATER

(3) Remove the latch board-L from the flange by

moving it upward and push outward.

(4) Remove the individual switch from the latch

board-L by removing two screws.

(1) Follow section I, step 1-3.

(2) Remove three screws securing the chamber

wall to the chamber.

(3) Remove two screws securing the convection

heater to the chamber.

(4) Pull out the convection heater diagonally with it

pursed by both sides from the C-Heater hanger.

THERMISTOR

(1) Follow section I, step 1-3.

(2) Pull up the thermistor.

C-MOTOR

PRIMARY SWITCH

CHAMBER WALL

OVEN LAMP

SWITCH

THERMISTOR

MONITOR

SWITCH

CHAMBER

SECONDARY

SWITCH

C-HEATER ASM

Fig. 22

Fig. 23

C-FAN

– 29 –

TROUBLESHOOTING

CAUTION: 1. Check grounding before checking for other trouble.

2. Be careful of the high voltage circuit.

3. When checking the continuity of the switches or transformer, disconnect one lead wire from

these parts and then check continuity without turning the power source on.

4. Do not touch any part of the circuitry on the control circuit board, since electrostatic discharge

may damage this control circuit.

Always touch yourself to ground while working on this circuit to discharge any static charge built

up in your body.

5. First operate the microwave oven following the correct operating procedures.

6. If the oven becomes inoperative because of a fuse, check the primary, the secondary and the

monitor switches, before replacing the fuse.

TEST PROCEDURE OR

CONDITION

CAUSE

CORRECTION

OFF CONDITION

Shorted wire in power cord or

wire harness.

Replace power cord or check

and repair wire harness.

The fuse opens when power

cord is plugged into wall

receptacle.

Defective monitor switch or out

of adjustment.

Test procedure monitor switch.

(See page 25.)

Microwave oven plug is not

inserted tightly.

Insert microwave oven plug

securely.

":0"does not appear in

display window when power

cord is first plugged into wall

outlet.

No power at outlet.

Open fuse.

Check home fuse.

Perform fuse test procedure

(See page 39.)

Open wire in power cord,

wiring harness, or wiring

between control panel

assembly units.

Replace or repair wiring.

Test procedure membrane key

of P.C.B. (See page 41.)

Defective membrane key of

P.C.B.

Display does not operate

properly when Clock is

touched.

– 30 –

TEST PROCEDURE OR

CORRECTION

CONDITION

CAUSE

Oven light does not light with

door opened.

No power in home.

Check wall outlet.

Open wire in power cord or

wire harness.

Replace or repair wiring.

Defective oven lamp switch or

out of adjustment.

Test procedure oven lamp

switch. (See page 38.)

Defective oven light.

Replace.

Open or loose wire connection

to the above components.

Check wiring.

Test procedure fuse.

(See page 39.)

Blown fuse or Oven light.

COOKING CONDITION

Defective relay 3 of P.C.B.

Test procedure relay 3 of P.C.B.

(See page 40.)

Oven light does not light in

cook cycle. (Oven light lights

when door is opened.)

Defective primary switch or out

of adjustment

Test procedure primary switch

(See page 25.)

Oven light lights, but turntable

motor does not operate.

Test procedure turntable motor.

(See page 38.)

Defective turntable motor.

Check connector and repair

wiring.

Open wiring of turntable motor.

Test procedure relay 4 of P.C.B.

(See page 40.)

Turntable motor operates

normally but circulation motor

does not operate.

Defective relay 4 of P.C.B.

Defective circulation motor.

Test procedure circulation motor.

(See page 38.)

Open or loose wiring to the

circulation motor.

Check and repair wiring. Check

receptacles of wire.

Turntable drags or

makes noise.

Excessive weight on tray or

improperly balanced.

Distribute food evenly, cook

smaller portions and/or use

lighter weight cookware.

– 31 –

TEST PROCEDURE OR

CORRECTION

CONDITION

CAUSE

Defective membrane key of

P.C.B.

Test procedure membrane key

of P.C.B. (See page 41.)

No input can be programmed.

Some inputs can not be

programmed.

Loose connection.

Connect them tightly.

Display shows a number or

figure different from one

touched.

Random programming when

pressing other than touch

pads.

Display fixes some figure and

can not accept any input.

Setting time does not count

down when touch Start.

Defective secondary switch or

out of adjustment

Test procedure secondary

switch. (See page 25.)

Defective membrane key of

P.C.B.

Test procedure membrane key

of P.C.B. (See page 41.)

Loose connection.

Test membrane key of P.C.B.

– 32 –

TEST PROCEDURE OR

CORRECTION

CONDITION

CAUSE

MICROWAVE

Oven does not go into a cook

cycle when Start pad is

touched.

Primary and/or secondary

interlock switches defective or

out of adjustment.

Test procedure primary and

secondary switches.

(See page 25.)

Test procedure relay 1 of P.C.B.

(See page 40.)

Defective relay 1 of P.C.B.

Defective membrane key of

P.C.B.

Test procedure membrane key

of P.C.B. (See page 41.)

Open or loose wiring to above

components.

Check and repair wiring.

Test procedure fan motor.

(See page 38.)

Output power is too low.

Defective fan motor.

Use the microwave oven at

adequate line voltage.

Low AC input voltage.

Food temperature is too low.

This may not be a defect.

It is possible that the food

should be cooked for a longer

time period.

Test procedure relay 1 and 3 of

P.C.B. (See page 40.)

Defective relay 1 or 3 of P.C.B.

Output is too high when you

set lower power level.

Test procedure relay 1 of P.C.B.

(See page 40.)

Defective relay 1 of P.C.B.

High AC input voltage.

Use the microwave oven at

adequate line voltage.

Using metallic ware and

allowing it to touch the oven

wall.

Do not use metallic ware for

cooking, except where noted in

the cookbook.

Sparks occuring.

Uneven cooking.

Ceramic ware trimmed in gold

or silver powder is used.

Do not use any type of

cookware with metallic trimming.

Inconsistent intensity of

microwave due to their

characteristics.

1. Wrap the thinner food with

aluminum foil.

2. Use plastic wrap or with a lid.

3. Stir once or twice while cooking

soup, cocoa or milk etc.

Food does not turn during

cooking cycle.

Food or cookware extending

oven edges of turntable prevents

turning; rearrange food.

Turntable motor does not

operate.

Refer to preceding turntable

motor problem.

– 33 –

TEST PROCEDURE OR

CORRECTION

CONDITION

CAUSE

This is not a defect.

Touch “0” key pad till a beep

sounds. (See page 14.)

No microwave oscillation.

Child Lock is set.

Test procedure relay 1 of P.C.B.

(See page 40.)

Defective relay 1 of P.C.B.

Defective high voltage

transformer.

Test procedure high voltage

transformer. (See page 36.)

Defective high voltage

capacitor.

Test procedure high voltage

capacitor. (See page 37.)

Test procedure high voltage

diode. (See page 36.)

Defective high voltage diode.

Defective magnetron.

Test procedure magnetron.

(See page 36.)

Use the microwave oven at

adequate line voltage.

Low AC input voltage.

Open or loose wiring to above

components.

Check and repair wiring.

Test procedure relay 1 of P.C.B.

(See page 40.)

Oven operates properly on

P-HI but does not cook

properly using another

cooking power.

Defective relay 1 of P.C.B.

Defective membrane key of

P.C.B.

Test procedure membrane key of

P.C.B. (See page 41.)

– 34 –

TEST PROCEDURE OR

CORRECTION

CONDITION

CAUSE

CONVECTION

CONV. indicator lights, but oven

does not go into cook cycle

when START pad is touched.

This is not a defect.

Touch “0” key pad till a beep

sounds. (See page 14.)

Child Lock is set.

Test procedure relay 2 of

P.C.B. (See page 40.)

Defective relay 2 of P.C.B.

Defective thermistor.

Test procedure thermistor.

(See page 40.)

Open or loose wire connection

to the above components.

Check and repair wiring.

Open or loose connection to

P.C.B.

Temperature in the oven cavity

is lower or higher than preset.

Test procedure relay 4 and 2 of

P.C.B. (See page 40.)

Defective relay 4 or 2 of P.C.B.

Defective convection heater

element.

Test procedure convection

heater. (See page 39.)

Test procedure thermistor.

(See page 40.)

Defective thermistor.

Test procedure circulation

motor. (See page 38.)

Defective circulation motor.

Defective drive mechanism of

circulation fan.

Check and repair.

Test procedure solenoid.

(See page 39.)

Defective Solenoid.

Defective air duct assembly.

Check and repair.

NOTE : • MAKE SURE THE WIRE LEADS CORRECTLY POSITIONED.

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

THE WIRES.

• WHEN REMOVING THE MAGNETRON, BE SURE TO INSTALL THE MAGNETRON GASKET IN THE CORRECT

POSITION AND GOOD CONDITION.

– 35 –

COMPONENT TEST PROCEDURE

CAUTIONS

1. DISCONNECT THE POWER SUPPLY CORD FROM THE WALL OUTLET WHENEVER REMOVING

THE OUT 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 FIGURE 24)

2. ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD (1 LITER

OF WATER IN A BEAKER) IN THE OVEN.

FILAMENT

WINDING

SECONDARY TERMINAL

WIRE SEADS (WHITE, WHITE)

H.V. CABLE ASM-A

FOR PRIMARY WINDING

WIRE LEAD (RED, RED)

FOR PRIMARY WINDING

Fig. 24

• TEST PROCEDURE

COMPONENTS

TEST PROCEDURE

RESULTS

See Fig 24.

HIGH VOLTAGE

TRANSFORMER

(Wire leads removed)

1. Measure the resistance.

(Ohm-meter scale: R x 1)

• Primary winding

Approx.: 0.37 ohm (at 20 °C)

Approx.: 90 ohm (at 20 °C)

Less than: 0.9 ohm

• Secondary winding

• Filament winding

2. Measure the resistance.

(Ohm-meter scale: R x 1000)

• Primary winding to ground

• Filament winding to ground

Normal: Infinite

See Fig 25.

MAGNETRON

(Wire leads removed)

1. Measure the resistance.

(Ohm-meter scale: R x 1)

• Filament terminal

Normal: Less than 1 ohm

Normal: Infinite

2. Measure the resistance.

(Ohm-meter scale: R x 1000)

• Filament to chassis

– 36 –

COMPONENTS

TEST PROCEDURE

RESULTS

ANTENNA

GASKET

CHASSIS

FILAMENT

Fig. 25

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.

HIGH VOLTAGE

CAPACITOR

Measure the resistance.

(Ohm-meter scale: Rx1000)

• Terminal to terminal.

Normal: Momentary indicates

several ohms, and

then gradually returns

to infinite.

Fig. 26

Fig. 27

Fig. 28

Fig. 29

Measure the resistance.

(Ohm-meter scale: Rx1000)

• Terminal to case.

Normal: Infinite.

HIGH VOLTAGE

DIODE

Measure the continuity (Forward).

(Ohm-meter scale: Rx1000)

Normal: Continuity.

Abnormal: Infinite.

NOTE :

Some inexpensive meters

may indicate infinite

resistance in both direction.

Measure the continuity (Reverse).

(Ohm-meter scale: Rx1000)

Normal: Infinite.

Abnormal: Continuity.

– 37 –

COMPONENTS

TEST PROCEDURE

RESULTS

OVEN LAMP SWITCH

(Wire leads removed.)

Check for continuity of the switch

with an Ohm-meter

Door

open

Door

COM

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

correctly connected.

FAN MOTOR

(Wire leads removed.)

Measure the resistance.

(Ohm-meter scale: Rx1)

Normal: Approx. 51 ohm.

Abnormal: Infinite or Several

ohms.

Fig. 30

Fig. 31

Fig. 32

TURNTABLE

MOTOR

(Wire leads removed.)

Measure the resistance.

(Ohm-meter scale: Rx1000)

Normal: Approx. 2800 ohm.

Abnormal: Infinite or Several

ohms.

CIRCULATION MOTOR

(Wire leads removed.)

Measure the resistance.

(Ohm-meter scale: Rx1)

Normal: Approx. 26 ohm.

Abnormal: Infinite or Several

ohms.

– 38 –

COMPONENTS

TEST PROCEDURE

RESULTS

FUSE

Check for continuity of the fuse

with an Ohm-meter

Normal

Abnormal

Fig. 33

NOTE: If the fuse is blown, check the primary, the secondary, and the

monitor switches before replacing the fuse.

(Refer to Test Procedure Switches on page 25.)

If the fuse is blown by improper switch operation replace the defective

switch and the fuse at the same time.

Replace just the fuse if the switches operate normally.

HEATER ELEMENT

(Wire leads removed.)

Measure the resistance.

(Ohm-meter scale: Rx1)

Normal: Approx. 9.3 ohm.

(at 20~30°C)

Fig. 34

Measure the resistance with 500V-100M

Ohm insulation resistance meter.

Normal: more than 0.5 M ohm.

Fig. 35

NOTE: Make sure heater is fully cooled when tested.

Normal: Approx. 2200 ohm.

SOLENOID

Abnormal: Infinite or Several

ohms.

Fig. 36

– 39 –

COMPONENTS

TEST PROCEDURE

RESULTS

Relay 3 of P.C.B.

Micro Power

Cooking Start

OFF

(Disconnect the 5 pin

connector from

P.C.B.)

Fig. 37

Fig. 38

Fig. 39

Fig. 40

Relay 4 of P.C.B.

(Disconnect the 5 pin

connector from

P.C.B.)

Convection

Cooking Start

Relay 3 of P.C.B.

(Wire leads removed.)

Micro Power

Cooking Start

Relay 4 of P.C.B.

(Wire leads removed.)

Convection

Cooking Start

– 40 –

COMPONENTS

TEST PROCEDURE

RESULTS

Membrane key

Check continuity between switch

terminals, by pressing an appropriate

pad on the key board.

The contacts assignment of the

respective pads on the key board is

as shown left figures.

MEMBRANE

P C B

PANEL

CONNECTOR KEY MATRIX

AUTO

COMBI

HOLD

WARM LOW

COMBI

HIGH

FISH

TIME

MICRO

TIME

POPCORN POULTRY

CLOCK

CONVE- MICRO STOP/

CTION POWER CLEAR

REHEAT MEAT START

Fig. 41

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

SERVICED FOR ANY REASON.

• MAKE SURE THE WIRE LEADS ARE CORRECT POSITION.

• WHEN REMOVING THE WIRE LEAD FROM THE PARTS, BE SURE TO GRASP THE CONNECTOR,

NOT THE WIRES.

– 41 –

PROCEDURE FOR MEASURING

MICROWAVE ENERGY LEAKAGE

CAUTIONS

MEASURING MICROWAVE ENERGY

LEAKAGE

• Be sure to check a microwave emission prior to

servicing the oven if the oven is operative prior to

servicing.

• POUR 275 15cc of 20 5°C, 68 9°F water in a

beaker which is graduated to 600 cc, and place the

beaker in the center of the oven.

• 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.

• The service personnel should inform the

manufacturer, importer, or assembler of any certified

oven unit found to have a microwave emission level

in excess of 4 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.

• Measure the microwave radiation using an

electromagnetic radiation monitor by holding the

probe perpendicular to the surface being measured.

• If the oven operates with 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:

Move probe along shaded area

Office of Compliance (HFZ-312)

Center for Devices and Radiological Health

1390, Piccard Drive,

Probe scanning speed

Less than 2.0 cm/sec

Rockville, Maryland 20850

• The service personnel should check all surface and

vent openings for microwave emission testing.

• Check for microwave energy leakage after every

servicing. The power density of the microwave

radiation leakage emitted by the microwave oven

should not exceed 2 mW/cm².sq.

And always start measuring of an unknown field to

assure safety for operating personnel from radiation

leakage.

Fig. 43

NOTE: The standard is 4 mW/cm².sq. while in the

customer’s home. 2 mW/cm².sq. stated here is

manufacturer’s own voluntary standard for units in

customer’s home.

MEASUREMENT WITH THE OUTER

CASE REMOVED

• When you replace the magnetron, measure

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.

EQUIPMENT

• Electromagnetic energy leakage monitor (NARDA

8100B, HOLADAY HI-1501)

• 600 cc glass beaker

• Glass thermometer 100°C or 212°F

— Around the magnetron

— The waveguide

WARNING : AVOID CONTACTING ANY HIGH

VOLTAGE PARTS

Fig. 42

– 42 –

MEASUREMENT WITH A FULLY

ASSEMBLED OVEN

DETERMINATION OF MEASUREMENT OF

MICROWAVE POWER OUTPUT

• 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) cc potable water.

• 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.

• The water is contained in a cylindrical borosilicate

glass vessel having a maximum material thickness

of 3 mm and an outside diameter of approximately

190 mm.

• Microwave energy leakage must not exceed the

values prescribed below.

NOTES:

• The oven and the empty vessel are at ambient

temperature prior to the start of the test.

Leakage with the out case removed - less than 4

mW/cm².sq.

• The initial temperature 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

Glass Tray 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) K 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°K.

• The microwave power output P in watts is calculated

from the following formula:

Leakage for a fully assembled oven (“Before the latch

switch (primary) interrupted”) with the door in a

slightly opened position-less than 2 mW/cm².sq.

NOTE WHEN MEASURING

• Do not exceed meter full scale deflection.

• The test probe must be removed no faster than 1

inch/sec (2.0 cm/sec) along the shaded, 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

possibly cause probe damage.

4187 x (∆T) + 0.55 X (T -T )X M

P =

• When high leakage is suspected, do not move the

probe horizontally aiong the oven surface, this may

possibly cause damage.

• T : Temperature after heating

• T : Temperature of bowl

• M : Weight of bowl

RECORD KEEPING AND NOTIFICATION

AFTER MEASUREMENT

is measured while the microwave generator is

operating at full power. Magnetron filament heat-up

time is not included.

• 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.

• 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.

• Should the microwave energy leakage not be more

than 2 mW/cm².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.

WATER LOAD

• At least once a year, have the electromagnetic

energy leakage monitor checked for calibration by

its manufacturer.

GLASS TRAY

Fig. 44

– 43 –

#EV#

EXPLODED VIEW AND PARTS LIST

INTRODUCTION

OVEN CAVITY PARTS

OUT CASE PARTS

BASE PLATE PARTS

OVEN INTERIOR PARTS

DOOR PARTS

SWITHES PARTS

CONTROL PANEL PARTS

– 44 –

#EV#

1 DOOR PARTS

13581A

15244U

13552A

15244H

15244T

13213A

14890A

14026U

WPZ017

15244L

14510A

14026L

13720D

14970A

WPZ017

– 45 –

#EV#

2 CONTROL PANEL PARTS

24781M

268711

WTP018

23572A

23790D

24510L

23506A

24970A

250201

– 46 –

#EV#

3. OVEN CAVITY PARTS

WTT021

33112U

WSZ137

34774U

WTT010

WTT028

WTT011

33052M

34890C

34370T

35026C

36549S

WTP013

53300C

35889A

– 47 –

#EV#

4. OVEN INTERIOR PARTS (1)

WSZ002

56411A

WTT021

WTP015

50FZZA

WTT011

53551S

56549F

56201A

WMT001

34930W

WTP002

54370D

54974S

55900A

56930M

54810U

56420A

WTT021

WTP004

54932A

WSZ137

56324A

55262A

368771

– 48 –

#EV#

5. OVEN INTERIOR PARTS (2)

56912B

36549C

WNH002

WTT010

54810S

WTP004

WTT021

WTT043

WTT010

56930G

53550L

55900N

53504A

WTT021

33741A

WTT021

56208A

35264A

35012T

54975G

34990A

34810Q

WMT002

WTT022

35301A

343501

55900C

WWP008

WNH003

WWS005

WTT010

568773

35012R

– 49 –

#EV#

6. SWITCHES PARTS

43501U

43500U

466004

WSZ085

WTP007

466001

466002

WSZ085

WTP010

466003

WTP007

43501L

43500L

44510A

44360A

– 50 –

#EV#

7. BASE PLATE PARTS

WSZ137

WSZ002

56170D

54810C

56851D

63303A

50CZZH

56851C

34774L

63302A

WSZ153

647781

13806F

WTT021

647781

WTT028

– 51 –

#EV#

8. WIRING HARNESS PARTS

568771

568772

– 52 –

9. CIRCUIT BOARD

– 53 –

10. CIRCUIT BOARD SCHEMATIC DIAGRAM

– 54 –

REPLACEMENT PARTS LIST

For Model: MH-1355M

LOC.

NO.

PART NO.

DESCRIPTION

SVC

ALTERNATE

*01

*02

*10

3874W500578

MANUAL,OWNERS

MANUAL,SERVICE

BOX

DOOR FRAME ASSEMBLY

CHOKE COVER

DOOR ASSEMBLY

PANEL,DOOR

DECO,FRONT

LATCH

LEVER

GLASS

SPRING

SEAL

3828W5S6174

3890W2ZC16A

1B71582C

13213A

13552A

13581A

13720D

13806F

14026L

14026U

14510A

14890A

14970A

15244H

15244L

15244T

15244U

23506A

23572A

23790D

24510L

24781M

24970A

250201

268711

33052M

33112U

33741A

343501

34370T

34774L

34774U

34810Q

34890C

34930W

34990A

35012R

35012T

35026C

35264A

35301A

35889A

36549S

36549C

368771

43500L

43500U

43501L

1B71371A

3581W1A026C

3720W1D025C

3B70060C

3B71930A

3B71929A

3B72692A

4890W2D010B

4B73100A

4B74139B

4B74141B

4B74140B

4B74142B

6638W2YA73A

3572W1A043C

3790W3D009A

3B73251A

4781W1M017C

4B72388A

5020W3G044G

5247W2YS25A

4B73904A

0B71047J

3B73691A

4B73725A

4B75372A

4B73895A

4B73896A

2B72369A

4B72492A

4B72944B

4B73754A

1B72016A

1B71367C

1B72025B

2B72122A

1B71187C

5889W2A005P

2B71932D

2B72066A

4B73008D

3B71931A

3B71933A

KEY MEMBRANE

PANEL,CONTROL

WINDOW,DIGITRON

LEVER

CONTROLLER ASSEMBLY,MICOM

SPRING

BUTTON

PWB(PCB) ASSEMBLY,SUB

CANOPY,MICA

OUT CASE,U-BENDING

PROTECTOR ASSEMBLY (MECH)

RING

SHAFT,TURN TABLE

BRACKET,HINGE

BRACKET,MOUNT

GLASS

HOLDER,WIRE

SUPPORTER

INSULATOR

INSULATOR ASSEMBLY

SHELF

AIR TUNNEL

HEATER ASSEMBLY

ROTATING RING ASSEMBLY

MOTOR(CIRC),SYNCHRONOUS

MOTOR(CIRC),CIRCULATION

HARNESS

BOARD,LATCH

BOARD ASSEMBLY,LATCH

3B72278K

R : SERVICE PARTS

– 55 –

LOC.

NO.

PART NO.

DESCRIPTION

BOARD ASSEMBLY,LATCH

SVC

ALTERNATE

43501U

44360A

44510A

466001

466002

466003

466004

50CZZH

50FZZA

53300C

53504A

53550L

53551S

54370D

54810C

54810S

54810U

54932A

54974S

54975G

55262A

55900A

55900C

55900N

56170D

56201A

56208A

56324A

56411A

56420A

56549F

56851C

56851D

568771

568772

568773

56912B

56930G

56930M

63302A

63303A

647781

WMT001

WMT002

WNH002

WNH003

WPZ017

3B72277G

4B74858A

4B70698A

3B73361E

3B73362A

3B73360B

3B73362F

6120W3H003F

3B74133K

1B72060A

1B71278A

3B73601A

1B71586C

4B74088B

4B75031A

3B72717A

4B75026A

4B74087A

1B71516B

1B71513A

1B72015A

2B72279B

3B72561A

3B72559A

6010W2H070B

2B72130F

ROD

LEVER

SWITCH,MICRO

CAPACITOR,DRAWING[HIGH VOLTAGE]

FUSE,DRAWING

TRAY,CERAMIC

3B73362H

3B73360A

3B73362E

3B71774G

2B71261H

3B74133H

CHAMBER

COVER,LAMP

COVER ASSEMBLY,HEATER COVER

SHAFT,DAMPER

BRACKET,CAPACITOR

BRACKET,MOTOR

BRACKET,DAMPER

CONNECTOR (MECH)

GUIDE ASSEMBLY,SUCTION

CHAMBER ASSEMBLY

DUCT

FAN

TRANSFORMER,HIGH VOLTAGE

FILTER ASSEMBLY(CIRC)

GLASS WOOL

MAGNETRON

POWER CORD ASSEMBLY

SOLENOID

MOTOR(CIRC),FAN

CABLE ASSEMBLY

HARNESS

LAMP,DRAWING

THERMOSTAT

BASE PLATE

BASE PLATE ASSEMBLY

LEG

SCREW MACHINE,TRUSS HEAD

NUT,HEXAGON

PIN,DRAWING

2B72302A

2B71165E

6411W2A002B

6420W3S001C

2B72294A

6861W3A001B

6021W3B001C

6877W1T085B

6877W3T080A

4B74175A

3B71543J

6930WRT001B

6930WRT003A

0B70792A

0B70876A

4B73900A

1MTC0402418

1MTC0402432

1NHA0400018

1NHA0400032

4B70898A

6930WRT002B

6930WRT004A

R : SERVICE PARTS

– 56 –

LOC.

NO.

PART NO.

DESCRIPTION

SVC

ALTERNATE

WSZ002

WSZ085

WSZ137

WSZ153

WTP002

WTP004

WTP007

WTP010

WTP013

WTP015

WTP018

WTT010

WTT011

WTT021

WTT022

WTT028

WTT043

WWP008

WWS005

1SBF0402418

4B70188C

4B73763A

SCREW TAP TITE(S),BINDING HEAD

SCREW,DRAWING

4B75265A

SCREW,DRAWING

1TPL0302018

1TPL0302418

1TPL0303118

1TPL0303718

1TPL0402418

1TPL0402618

1TPL0402818

1TTG0402422

1TTG0402632

1TTL0402418

1TTL0402422

1TTL0402818

1TTL0402432

1WPL0500032

1WSD0400032

SCREW TAPPING,PAN HEAD

SCREW TAPPING,TRUSS HEAD

WASHER,PLAIN

WASHER,SPRING LOCK

R : SERVICE PARTS

– 57 –

REPLACEMENT PARTS LIST

For Model: MH-1356M

LOC.

NO.

PART NO.

DESCRIPTION

SVC

ALTERNATE

*01

*02

*10

3874W501050

MANUAL,OWNERS

MANUAL,SERVICE

BOX,YELLOW

DOOR FRAME ASSEMBLY

CHOKE COVER

DOOR ASSEMBLY

PANEL,DOOR

DECO,FRONT

LATCH

LEVER

GLASS

SPRING

SEAL

3828W5S6174

3890W2ZC16B

1B71582C

13213A

13552A

13581A

13720D

13806F

14026L

14026U

14510A

14890A

14970A

15244H

15244L

15244T

15244U

23506A

23572A

23790D

24510L

24781M

24970A

250201

268711

33052M

33112U

33741A

343501

34370T

34774L

34774U

34810Q

34890C

34930W

34990A

35012R

35012T

35026C

35264A

35301A

35889A

36549C

36549S

368771

43500L

43500U

43501L

1B71371A

3581W1A026C

3720W1D025C

3B70060C

3B71930A

3B71929A

3B72692A

4890W2D010B

4B73100A

4B74139B

4B74141B

4B74140B

4B74142B

6638W2YA73C

3572W1A043C

3790W3D009B

3B73251A

4781W1M160B

4B72388A

5020W3G044D

5247W2YS25A

4B73904A

0B71047J

3B73691A

4B73725A

4B75372A

4B73895A

4B73896A

2B72369A

4B72492A

4B72944B

4B73754A

1B72016A

1B71367C

1B72025B

2B72122A

1B71187C

5889W2A005P

2B72066A

2B71932D

4B73008D

3B71931A

3B71933A

KEY MEMBRANE

PANEL,CONTROL

WINDOW,DIGITRON

LEVER

CONTROLLER ASSEMBLY,KEY PAD

SPRING

BUTTON

PWB(PCB) ASSEMBLY,SUB

CANOPY,MICA

OUT CASE,U-BENDING

PROTECTOR ASSEMBLY (MECH)

RING

SHAFT,TURN TABLE

BRACKET,HINGE

BRACKET,MOUNT

GLASS

HOLDER,WIRE

SUPPORTER

INSULATOR

INSULATOR ASSEMBLY

SHELF

AIR TUNNEL

HEATER ASSEMBLY

ROTATING RING ASSEMBLY

MOTOR(CIRC),CIRCULATION

MOTOR(CIRC),SYNCHRONOUS

HARNESS

BOARD,LATCH

BOARD ASSEMBLY,LATCH

3B72278K

R : SERVICE PARTS

– 58 –

LOC.

NO.

PART NO.

DESCRIPTION

BOARD ASSEMBLY,LATCH

SVC

ALTERNATE

43501U

44360A

44510A

466001

466002

466003

466004

50CZZH

50FZZA

53300C

53504A

53550L

53551S

54370D

54810C

54810S

54810U

54932A

54974S

54975G

55262A

55900A

55900C

55900N

56170D

56201A

56208A

56324A

56411A

56420A

56549F

56851C

56851D

568771

568772

568773

56912B

56930G

56930M

63302A

63303A

647781

WMT001

WMT002

WNH002

WNH003

WPZ017

3B72277G

4B74858A

4B70698A

3B73361E

3B73362A

3B73360B

3B73362F

6120W3H003F

3B74133K

1B72060A

1B71278A

3B73601A

1B71586C

4B74088B

4B75031A

3B72717A

4B75026A

4B74087A

4974W2S015A

1B71513A

1B72015A

2B72279B

3B72561A

3B72559A

6010W2H070B

2B72130F

2B72302A

ROD

LEVER

SWITCH,MICRO

CAPACITOR,DRAWING[HIGH VOLTAGE]

FUSE,DRAWING

TRAY,CERAMIC

CHAMBER

3B73362H

3B73360A

3B73362E

2B71261H

3B71774G

3B74133H

COVER,LAMP

COVER ASSEMBLY,HEATER COVER

SHAFT,DAMPER

BRACKET,CAPACITOR

BRACKET,MOTOR

BRACKET,DAMPER

ROD

GUIDE,SUCTION

CHAMBER ASSEMBLY

DUCT

FAN

TRANSFORMER,HIGH VOLTAGE

FILTER ASSEMBLY(CIRC)

GLASS WOOL

MAGNETRON

POWER CORD ASSEMBLY

SOLENOID

MOTOR(CIRC),FAN

CABLE ASSEMBLY

HARNESS

LAMP,DRAWING

THERMOSTAT

BASE PLATE

BASE PLATE ASSEMBLY

LEG

SCREW MACHINE,TRUSS HEAD

NUT,HEXAGON

PIN,DRAWING

2B71165E

6411W2A002B

6420W3S001C

2B72294A

6861W3A001B

6021W3B001C

6877W1T085B

6877W3T080A

4B74175A

3B71543J

6930WRT001B

6930WRT003A

0B70792A

0B70876A

4B73900A

1MTC0402418

1MTC0402432

1NHA0400018

1NHA0400032

4B70898A

6930WRT002B

6930WRT004A

R : SERVICE PARTS

– 59 –

LOC.

NO.

PART NO.

DESCRIPTION

SVC

ALTERNATE

WSZ002

WSZ085

WSZ137

WSZ153

WTP002

WTP004

WTP007

WTP010

WTP013

WTP018

WTT010

WTT011

WTT021

WTT022

WTT028

WTT043

WWP008

WWS005

1SBF0402418

4B70188C

4B73763A

SCREW TAP TITE(S),BINDING HEAD

SCREW,DRAWING

4B75265A

SCREW,DRAWING

1TPL0302018

1TPL0302418

1TPL0303118

1TPL0303718

1TPL0402418

1TPL0402818

1TTG0402422

1TTG0402632

1TTL0402418

1TTL0402422

1TTL0402818

1TTL0402432

1WPL0500032

1WSD0400032

SCREW TAPPING,PAN HEAD

SCREW TAPPING,TRUSS HEAD

WASHER,PLAIN

WASHER,SPRING LOCK

R : SERVICE PARTS

– 60 –

REPLACEMENT PARTS LIST

For Model: MH-1357M

LOC.

NO.

PART NO.

DESCRIPTION

SVC

ALTERNATE

*01

*02

*10

3874W501050

MANUAL,OWNERS

MANUAL,SERVICE

BOX,YELLOW

DOOR FRAME ASSEMBLY

CHOKE COVER

DOOR ASSEMBLY

PANEL,DOOR

DECO,FRONT

LATCH

LEVER

GLASS

SPRING

SEAL

3828W5S6174

3890W2ZC16C

1B71582C

13213A

13552A

13581A

13720D

13806F

14026L

14026U

14510A

14890A

14970A

15244H

15244L

15244T

15244U

23506A

23572A

23790D

24510L

24781M

24970A

250201

268711

33052M

33112U

33741A

343501

34370T

34774L

34774U

34810Q

34890C

34930W

34990A

35012R

35012T

35026C

35264A

35301A

35889A

36549C

36549S

368771

43500L

43500U

43501L

1B71371A

3581W1A026W

3720W1D025C

3B70060C

3B71930A

3B71929A

3B72692A

4890W2D010Q

4B73100A

4B74139B

4B74141B

4B74140B

4B74142B

6638W2YA73C

3572W1A043C

3790W3D009B

3B73251A

4781W1M160B

4B72388A

5020W3G044D

5247W2YS25A

4B73904A

0B71047J

3B73691A

4B73725A

4B75372A

4B73895A

4B73896A

2B72369A

4B72492A

4B72944B

4B73754A

1B72016A

1B71367C

1B72025B

2B72122A

1B71187C

5889W2A005P

2B72066A

2B71932D

4B73008D

3B71931A

3B71933A

KEY MEMBRANE

PANEL,CONTROL

WINDOW,DIGITRON

LEVER

CONTROLLER ASSEMBLY,KEY PAD

SPRING

BUTTON

PWB(PCB) ASSEMBLY,SUB

CANOPY,MICA

OUT CASE,U-BENDING

PROTECTOR ASSEMBLY (MECH)

RING

SHAFT,TURN TABLE

BRACKET,HINGE

BRACKET,MOUNT

GLASS

HOLDER,WIRE

SUPPORTER

INSULATOR

INSULATOR ASSEMBLY

SHELF

AIR TUNNEL

HEATER ASSEMBLY

ROTATING RING ASSEMBLY

MOTOR(CIRC),CIRCULATION

MOTOR(CIRC),SYNCHRONOUS

HARNESS

BOARD,LATCH

BOARD ASSEMBLY,LATCH

3B72278K

R : SERVICE PARTS

– 61 –

LOC.

NO.

PART NO.

DESCRIPTION

BOARD ASSEMBLY,LATCH

SVC

ALTERNATE

43501U

44360A

44510A

466001

466002

466003

466004

50CZZH

50FZZA

53300C

53504A

53550L

53551S

54370D

54810C

54810S

54810U

54932A

54974S

54975G

55262A

55900A

55900C

55900N

56170D

56201A

56208A

56324A

56411A

56420A

56549F

56851C

56851D

568771

568772

568773

56912B

56930G

56930M

63302A

63303A

647781

WMT001

WMT002

WNH002

WNH003

WPZ017

3B72277G

4B74858A

4B70698A

3B73361E

3B73362A

3B73360B

3B73362F

6120W3H003F

3B74133K

1B72060A

1B71278A

3B73601A

1B71586C

4B74088B

4B75031A

3B72717A

4B75026A

4B74087A

4974W2S015A

1B71513A

1B72015A

2B72279B

3B72561A

3B72559A

6010W2H070B

2B72130F

2B72302A

ROD

LEVER

SWITCH,MICRO

CAPACITOR,DRAWING[HIGH VOLTAGE]

FUSE,DRAWING

TRAY,CERAMIC

CHAMBER

3B73362H

3B73360A

3B73362E

2B71261H

3B71774G

3B74133H

COVER,LAMP

COVER ASSEMBLY,HEATER COVER

SHAFT,DAMPER

BRACKET,CAPACITOR

BRACKET,MOTOR

BRACKET,DAMPER

ROD

GUIDE,SUCTION

CHAMBER ASSEMBLY

DUCT

FAN

TRANSFORMER,HIGH VOLTAGE

FILTER ASSEMBLY(CIRC)

GLASS WOOL

MAGNETRON

POWER CORD ASSEMBLY

SOLENOID

MOTOR(CIRC),FAN

CABLE ASSEMBLY

HARNESS

LAMP,DRAWING

THERMOSTAT

BASE PLATE

BASE PLATE ASSEMBLY

LEG

SCREW MACHINE,TRUSS HEAD

NUT,HEXAGON

PIN,DRAWING

2B71165E

6411W2A002B

6420W3S001C

2B72294A

6861W3A001B

6021W3B001C

6877W1T085B

6877W3T080A

4B74175A

3B71543J

6930WRT001B

6930WRT003A

0B70792A

0B70876A

4B73900A

1MTC0402418

1MTC0402432

1NHA0400018

1NHA0400032

4B70898A

6930WRT002B

R : SERVICE PARTS

– 62 –

LOC.

NO.

PART NO.

DESCRIPTION

SVC

ALTERNATE

WSZ002

WSZ085

WSZ137

WSZ153

WTP002

WTP004

WTP007

WTP010

WTP013

WTP018

WTT010

WTT011

WTT021

WTT022

WTT028

WTT043

WWP008

WWS005

1SBF0402418

4B70188C

4B73763A

SCREW TAP TITE(S),BINDING HEAD

SCREW,DRAWING

4B75265A

SCREW,DRAWING

1TPL0302018

1TPL0302418

1TPL0303118

1TPL0303718

1TPL0402418

1TPL0402818

1TTG0402422

1TTG0402632

1TTL0402418

1TTL0402422

1TTL0402818

1TTL0402432

1WPL0500032

1WSD0400032

SCREW TAPPING,PAN HEAD

SCREW TAPPING,TRUSS HEAD

WASHER,PLAIN

WASHER,SPRING LOCK

R : SERVICE PARTS

– 63 –

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