LG MH-1357M, MH-1356M, MH-1355M Service Manual

MICROWAVE OVEN

SERVICE MANUAL

MODEL: MH-1355M

MH-1356M MH-1357M

CAUTION

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

Website: http://biz.lgservice.com

P/NO : 3828W5S6174

July, 1998

Printed in Korea

– 2 –

SAFETY PRECAUTIONS

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.

— Proper operation of the microwave ovens requires that the magnetron be assembled to the wave guide 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.

— Routine service safety procedures should be exercised at all times.

— Untrained personnel should not attempt service without a thorough review of the test procedures and safety

information contained in this manual.

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.

– 3 –

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

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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

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CIRCUIT DESCRIPTION

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DESCRIPTION AND FUNCTION OF COMPONENTS

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NECESSARY TOOLS AND MEASURING INSTRUMENTS

--------------------------------------------------------------

INSTALLATION AND ADJUSTMENT OF THE INTERLOCK SYSTEM

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INTERLOCK CONTINUITY TEST

-------------------------------------------------------------------------------------------------

DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE

---------------------------------------------------------

TROUBLESHOOTING

----------------------------------------------------------------------------------------------------------------

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

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2. CONTROL PANEL PARTS

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3. OVEN CAVITY PARTS

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4. OVEN INTERIOR PARTS (1)

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5. OVEN INTERIOR PARTS (2)

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6. LATCH PARTS

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7. BASE PLATE PARTS

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8. WIRING HARNESS PARTS

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9. CIRCUIT BOARD

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10. CIRCUIT BOARD SCHEMATIC DIAGRAM

-------------------------------------------------------------------------

REPLACEMENT PARTS LIST

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– 4 –

SPECIFICATIONS

Power Supply

---------------------------------------------------

120 VAC, 60 Hz

Power Consumption

------------------------------------------

1400 Watts (Microwave), 12A 1580 Watts (Convection), 13.2A

Output

--------------------------------------------------------------

*850 Watts (Microwave) 1500 Watts (Convection)

Microwave Frequency

---------------------------------------

2450 MHz ± 50 MHz

High Voltage Capacitor

--------------------------------------

0.91µF, 2100V AC

High Voltage Diode

-------------------------------------------

HVR-IX

Oven Lamp

-------------------------------------------------------

125V, 25W

Timer

---------------------------------------------------------------

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

Power Control

---------------------------------------------------

MICOM

Outer Dimension

-----------------------------------------------

15" x 22

/4" x 1913/16" (H x W x D)

Cavity Dimension

----------------------------------------------

103/16" x 149/16" x 1411/16" (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.

– 5 –

• 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.

• 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.

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

– 6 –

INSTALLATIONS

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.

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

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.

10. Do not operate the oven at microwave and

combination mode with Grill rack placed in the cavity when the oven is empty.

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

WARNINGTHIS APPLIANCE MUST BE EARTHED

IMPORTANT

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.

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.

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.

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.

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

The wires in this mains lead are colored in accordance with the following code:

Green-and-yellow: Earth Blue: Neutral Brown: Live

– 7 –

FEATURE DIAGRAM

Remove your Microwave/Convection Oven and all material from the shipping carton. Your oven will be packed with the following material:

Turntable

---------------------------------------

1 Each

Rotating Ring Asm

--------------------------

1 Each

Convection Rack

-----------------------------

1 Each

Cookbook

---------------------------------------

1 Each

Owner’s Manual

------------------------------

1 Each

Do not use this Microwave/Convection Oven for commercial purposes. This Microwave/Convection Oven is made for household use only.

SAFETY INTERLOCK SYSTEM

CONVECTION RACK

TURNTABLE

ROTATING RING ASM

SEE-THROUGH

DOOR

AIR VENTS

CONTROL PANEL

Fig. 3

– 8 –

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.

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.

DEFROST-

Used in setting Auto Defrost.

POPCORN- Used to pop pack aged popcorn.

PLUS TIME-

Used to cook food for a longer time after cooking end.

HOLD WARM- Used to keep the food warm.

NUMBERS-

Used to enter the:

• Time of day.

• Cooking times.

• Cooking powers.

• Cooking temperatures.

• Weight for Auto

Combination cooking.

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.

CONVECTION-

Used in setting convection cooking or pre-heat.

REHEAT- Used to reheat foods easily. Reheat Guides is next to the pad.

COOK- Used to cook foods easily. Cook guide is next to the pad.

MICRO TIME- Used in setting microwave cooking time.

MICRO POWER-

Used to select cooking power levels.

CLOCK- Used to set the time of day.

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.

– 9 –

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.

3. Digital Readout Display

Numbers

Touch Pads

Cooking

Power

Time

(Example: 99 min

and 99 sec)

Microwave

Emission Time

(sec/cycle)

ON OFF

Numbers

Touch Pads

Cooking

Power

Microwave

Emission Time

(sec/cycle)

ON OFF

100

9 9 : 9 9

Time

(Example: 2 hours

and 30 min)

2 h 3 0

Temperature

(Example: 300°F)

3 0 0 f

Clock

(Example: 12 hours

and 30 min)

1 2 : 3 0

Cooking Power

(Example: cooking

power 50)

p - 5 0

Weight

(Example: 4.5 lbs)

4 . 5

End Error

– 10 –

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.

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 controlled according to the type of food being cooked.

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 Combination Cooking.

Fig. 5

Magnetron

Convection Heater

Convection Rack

Circulation Motor

Convection Heater

Convection Rack

Circulation Motor

– 11 –

COOKING FLOW CHART

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 STAGE 2 STAGE 3 HOLD WARM AUTO WEIGHT DEFROST STAGE 1 STAGE 2 STAGE 3 AUTO WEIGHT DEFROST STAGE 1 STAGE 2 HOLD WARM AUTO WEIGHT DEFROST STAGE 1 STAGE 2 AUTO WEIGHT DEFROST STAGE 1 HOLD WARM AUTO WEIGHT DEFROST STAGE 1 AUTO WEIGHT DEFROST HOLD WARM AUTO WEIGHT DEFROST STAGE 1 STAGE 2 STAGE 3 HOLD WARM STAGE 1 STAGE 2 STAGE 3 STAGE 1 STAGE 2 HOLD WARM STAGE 1 STAGE 2 STAGE 1 HOLD WARM STAGE 1 HOLD WARM AUTO WEIGHT COMBINATION REHEAT POPCORN

START

REHEAT

AUTO

WEIGHT

DEFROST

AUTO

WEIGHT

COMBINATION

STAGE 1 STAGE 3

HOLD

WARM

STAGE 2

CLOCK

POPCORN

– 12 –

OPERATING INSTRUCTIONS

TO SET THE TIME OF DAY

1. When the oven is plugged in, the display window will show zero( :0)

2. Touch CLOCK.

3. Touch numbers for correct time of day.

4. Touch CLOCK again.

NOTE:

• 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.

• If a momentary power failure occurs, the clock display returns to zero ( : 0). If this occurs, please reset the clock.

• 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.

“MICRO TIME” COOKING

1. Touch MICRO TIME.

2. Touch numbers for desired cooking time.

3. Touch MICRO POWER.

4. Touch number for desired cooking power.

5. Touch START.

“CONVECTION” COOKING

To Preheat

1. Touch CONVECTION.

2. Touch number for desired preheating temperature.

3. Touch START.

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:

• 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.

– 13 –

“COMBINATION” COOKING

1. Touch COMBINATION HIGH or LOW.

2. Touch numbers for desired cooking time.

3. Touch START.

NOTE:

• Output is fixed as follows.

“AUTOMATIC DEFROST BY WEIGHT”

1. Touch MEAT, POULTRY or FISH of AUTO WEIGHT DEFROST.

2. Touch numbers for desired weight.

3. Touch START.

NOTE:

• 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.

“AUTOMATIC COMBINATION” COOKING

1. Touch AUTO COOK.

2. Touch number for desired category.

3. Touch numbers for desired cooking weight.

4. Touch START.

NOTE:

• 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.

• 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.

“REHEAT”

1. Touch REHEAT.

2. Touch REHEAT repeatedly for desired category of Reheat. (Touch 1. or 2)

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.

“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.

MICROWAVE

COOKING TIME

COMBI-HIGH

COMBI-LOW

8 Sec 8 Sec

14 Sec (375°F) 14 Sec (350°F)

CONVECTION

COOKING TIME

– 14 –

“POPCORN”

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

2. Touch POPCORN.

3. Touch START.

NOTE:

• If additional time is required, micro HI power in increments of 20 sec.

• 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.

CHILD LOCK

To Set Child Lock

1. Touch “0” more than 2 seconds.

NOTE:

• 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.

• At this time, if you start to cook “L” will appear in the display window for 1 sec at first.

To Cancel Child Lock

1. Touch “0” more than 2 seconds.

NOTE:

• When you cancel Child Lock, STOP/CLEAR must always be touched before selection.

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.

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”.

7. Touch START.

NOTE:

• There are three memory stages.

– 15 –

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.

POWER

T R ANS

CN 1

1 2 3 4 5

WH B L R D YL

REL A Y 3

REL A Y 4

P. C.B.

1 2 3

THERMOSTAT

( M AGNE TR ON )

SOLENOID

RD RD

OVEN

LAMP

SWITCH

COM

AC 120V

60Hz

THERMOSTAT

(OVEN)

FUSE

OVEN LAMP

O. L

TURNTABLE MOTOR

T. T. M

FAN MOTOR

F.M.

C.M.

CIRCULATION MOTOR

RECTIFIRE FU SE

CONVECTION HEA TER

REL AY 2

MONI TOR SWITCH

REL A Y1

NOTE: 1. DOOR IS CLOSED.

2. COOK OFF.

3.CIRCUIT BE SUB JECT TO

CH A NGE WITHOU T NO TICE.

SYM B OL COLOR

WH WHI TE

BK BL A CK

BL BL UE

RD RED

YL YEL L OW

PK PINK

BN BROWN

HIGH VOL TAGE

DIODE

MAGNETRON

HIGH VOL TAGE

CAPACITOR

TRA N SFORM ER

1 2 3

SECONDARY

SWITCH

THERMI S TOR

PRIMAR Y

SWITCH

Fig. 6

– 16 –

SYSTEM 2: MICROWAVE COOKING CONDITION

Set up: Door is closed. START is touched.

Normal operation

• Oven light turns on.

• Turntable operates.

• Fan motor operates.

POWER

T R ANS

CN 1

1 2 3 4 5

WH B L R D YL

REL A Y 3

REL A Y 4

P. C.B.

1 2 3

THERMOSTAT

( M AGNE TR ON )

SOLENOID

RD RD

OVEN

LAMP

SWITCH

COM

AC 120V

60Hz

THERMOSTAT

(OVEN)

FUSE

OVEN LAMP

O. L

TURNTABLE MOTOR

T. T. M

FAN MOTOR

F.M.

C.M.

CIRCULATION MOTOR

RECTIFIRE FU SE

CONVECTION HEA TER

REL AY 2

MONI TOR SWITCH

REL A Y1

NOTE: 1. DOOR IS CL OSED.

2. COOK OFF.

3.CIRCUIT BE SUB JECT TO

CH A NGE WITHOU T NO TICE.

SYM B OL COLOR

WH WHI TE

BK BL A CK

BL BL UE

RD RED

YL YEL L OW

PK PINK

BN BROWN

HIGH VOL TAGE

DIODE

MAGNETRON

HIGH VOL TAGE

CAPACITOR

TRA N SFORM ER

1 2 3

SECONDARY

SWITCH

THERMI S TOR

PRIMAR Y

SWITCH

Fig. 7

– 17 –

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.

POWER

T R ANS

CN 1

1 2 3 4 5

WH B L R D YL

REL A Y 3

REL A Y 4

P. C.B.

1 2 3

THERMOSTAT

( M AGNE TR ON )

SOLENOID

RD RD

OVEN

LAMP

SWITCH

COM

AC 120V

60Hz

THERMOSTAT

(OVEN)

FUSE

OVEN LAMP

O. L

TURNTABLE MOTOR

T. T. M

FAN MOTOR

F.M.

C.M.

CIRCULATION MOTOR

RECTIFIRE FU SE

CONVECTION HEA TER

REL AY 2

MONI TOR SWITCH

REL A Y1

NOTE: 1.DOOR IS CLOSED.

2. COOK OFF.

3.CIRCUIT BE SUB JECT TO

CH A NGE WITHOU T NO TICE.

SYM B OL COLOR

WH WHI TE

BK BL A CK

BL BL UE

RD RED

YL YEL L OW

PK PINK

BN BROWN

HIGH VOL TAGE

DIODE

MAGNETRON

HIGH VOL TAGE

CAPACITOR

TRA N SFORM ER

1 2 3

SECONDARY

SWITCH

THERMI S TOR

PRIMAR Y

SWITCH

Fig. 8

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