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Website: http://biz.lgservice.com

LIGHT OVEN “SolarDOM”

SERVICE MANUAL

MODEL: MP-9482S

CAUTION

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

July,2002

Printed in Korea P/NO : 3828W5S2190

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.

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.

CAUTION

MICROWAVE RADIATION

DO NOT BECOME EXPOSED TO RADIATION FROM THE MICROWAVE GENERATOR

OR OTHER PARTS CONDUCTING MICROWAVE ENERGY.

CONTENTS

(Page)

SAFETY PRECAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Inside front cover

SPECIFICATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-1

CAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-1

INSTALLATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-1

OPERATING INSTRUCTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-1

FEATURES- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-1

CONTROL PANEL - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-1

OPERATING SEQUENCE- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-2

SCHEMATIC DIAGRAM - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-3

CIRCUIT DESCRIPTION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4-4

SERVICE INFORMATION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-1

TOOLS AND MEASURING INSTRUMENTS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-1

MICROWAVE LEAKAGE TEST - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-1

MEASUREMENT OF MICROWAVE POWER OUTPUT - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-3

DISASSEMBLY AND ADJUSTMENT - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-3

UPPER & LOWER HEATER- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-7

INTERLOCK CONTINUITY TEST- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-8

COMPONENT TEST PROCEDURE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-9

TROUBLE SHOOTING - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5-14

EXPLODED VIEW - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6-1

REPLACEMENT PARTS LIST - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7-1

SCHEMATIC DIAGRAM OF P.C.B. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-1

PRINTED CIRCUIT BOARD - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8-2

P.C.B. PARTS LIST - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 9-1

SPECIFICATIONS

ITEM

MODEL

Power Requirement

Power Output

Microwave Frequency

Magnetron

Timer

Outside Dimensions

Cavity Dimensions

Net Weight

Shipping weight

Control Complement

DESCRIPTION

MP-9482S

230 Volts AC 50 Hz

Single phase, 3 wire grounded

Microwave

Grill

Combination

Convection

1,650W

Max 2,100W

Max 2,800W

1,900W

900 Watts full microwave power (IEC60705)

2,450 MHz

2M214 - 240GP

0 ~ 90 min.

527 (W) x 392 (H) x 480 (D) mm

440 (W) x 204 (H) x 420 (D) mm

28 kg

31 kg

1. Microwave Power level:

MAX (900W), 600W, 360W, 180W, 90W

3. Convection: 40°C, 100~250°C

2. GRILL

Category

Grill-1

Grill-2

Grill-3

Display gr-1 gr-2 gr-3

Heater operating

Upper heater (2000W)

Upper heater (1100W)

Lower heater (700W)

4. SPEED COMBI

Display

Co-1

Co-2

Co-3

Co-4

Co-5

Heater + Microwave power selection

Grill-1 + 180W, 360W, 600W

Grill-2 + 180W, 360W, 600W

Grill-3 + 180W, 360W, 600W

(Upper+Lower)+0W, 180W, 360W, 600W

Convection + 180W, 360W, 600W

5. SPEED AUTO COOK

SC1( ):Frozen Pizza

SC2( ):French Fires

SC3( ):Whole Chicken

SC4( ):Chicken Pieces

SC5( ):Beef Steaks

SC6( ):Roast Pork

SC7( ):Roast Beef

SC8( ):Jacket Potatoes

SC9( ):Frozen Dinners

SC10( ):Fresh Vegetables

SC11( ):Frozen Vegetables

SC12( ):Rice/Pasta

Nameplate Location

Front Plate

Accessories

Owner's manual & Cook book

High rack, Low rack

Metal tray

This oven is designed for household use only.

It is not recommended for commercial purposes.

1-1

CAUTIONS

Unlike other appliances, the microwave oven is high-voltage and high-current equipment.

Though it is free from danger in ordinary use, extreme care should be taken during repair.

• 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.

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.

• 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

FILAMENT

TERMINALS

MAGNETRON

Gasket

COOLING FIN

MAGNETRON

CHASSIS GROUND

• 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.

2-1

INSTALLATIONS

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

INSTALLING

1. Empty the 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 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. (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 the oven in an ambient temperature less than

104°F(40°C).

6. Place the oven on a sturdy and flat surface at least

10 cm(4 inches) from the wall.

7. Place the oven as far away as possible from TV,

RADIO, COMPUTER, etc., to prevent interference.

8. Do not touch the front glass during or after cooking of the Grill and convection and Combination mode.

This glass is very hot during heater operating.

9. Do not operate the oven at microwave and combination mode with Grill rack placed in the cavity when the oven is empty.

10cm

WARNING-

THIS APPLIANCE

MUST BE EARTHED

IMPORTANT

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

Green-and-yellow:

Blue:

Brown:

Earth

Neutral

Live

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.

3-1

FEATURES

OPERATING INSTRUCTIONS

Oven Front Plate

Window Door Screen

Door Frame

Control Panel Deco.

Control Panel

Choke Cover

Safety Door Lock System

LOW Rack Metal Tray

CONTROL PANEL

HIGH Rack

3 4 5 6 7

1. Display Window: You can show time of day, cooking time, power level and cooking categories.

2. Enter: You can determine the selected cooking category, microwave power level or temperature.

3. Micro: You can select five power level settings.

4. Grill: You can select the grill categories.

5. Conv.: You can select temperature and time of convection.

6. Speed Combi: You can select the combination categories.

7. Speed Auto Cook: Speed auto cook allows you to cook most of your favorite food quickly by selecting the food type and the weight of the food.

8. Dial Knob:

• You can set cooking times, temperature, weight and cooking categories.

• While cooking with auto and manual function, you can lengthen or shorten the cooking time at any point by turning the dial knob(except defrost mode).

9. Defrost: You can select the food type and the weight of the food.

8 1 2 9 10 11 12 13 14

10. Favorite: The cooking program can be stored in the memory of your oven up to 9 modes(FA-1~FA-9).

11. Clock: You can set the time of day.

12. Stop/Clear: You can stop over and clear all entries except time of day.

• Press Stop/Clear Button one time, all icons will be displayed on window in time of day or clear mode.

• Press Stop/Clear Button one more time, all icons will be disappeared.

13. Start/Quick Start:

• In order to start cooking which is selected, press button one time.

• The quick start feature allows you to set 30 seconds intervals of

HIGH power cooking with a touch of the quick start button.

14. Icon: You can see all icons by pressing “Stop/Clear” button one time and remove all icons by pressing one more time(all icons will disappear automatically after 15 seconds).

Blink will guide to next step for setting while cooking, the icon of the selected cooking mode will be displayed on window.

4-1

OPERATING SEQUENCE

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

1. SETTING THE CLOCK

Stop/Clear Clock Desired hour

Start

2. MICROWAVE COOKING

Stop/

Clear

Function

MWO

Enter

6. SPEED COMBI COOKING

*Speed combi Categories

Co-1

Co-2

Co-3

Co-4

Co-5

Grill-1 + Microwave Power Level

Grill-2 + Microwave Power Level

Grill-3 + Microwave Power Level

(Upper+Lower Heater) + Microwave Power Level

Convection + Microwave Power Level

Grill & Convection & Speed Combi ex)

Stop/

Clear

Function

Combi-4

Enter

Turn Dial

Desired convection temp (40ûC, 100ûC~250ûC)

Enter Enter Start

Start

3. MULTI STAGE COOKING (MICROWAVE)

Stage 1

Stop/

Clear

Function

MWO

Enter

Stage 2

Function

MWO

Desired power level

Enter Start

7. DEFROST

Stop/

Clear

Function

Defrost

8. SPEED COMBI COOK

Stop/

Clear

Desired speed cook category

9. SPEED AUTO COOK

Stop/

Clear

4. GRILL COOKING

Stop/

Clear

Function

Grill

Enter

Start

*Grill Categories

Grill-1

Grill-2

Grill-3

(Halogen+Ceramic+Sheather) Upper Heater

Upper Sheath Heater

Lower Sheath Heater

10. CHILD LOCK

This oven has a CHILD LOCK feature.

To Set CHILD LOCK

Stop/Clear

Stop/Clear

(Touch and Hold)

To Cancel CHILD LOCK

Stop/Clear

Stop/Clear

(Touch and Hold)

Food weight

5. CONVECTION COOKING

To cook

Stop/

Clear

Function

Convection

Enter

Enter

Turn Dial

Desired convection temp (40ûC, 100ûC~250ûC)

Start

11. QUICK START

Stop/Clear Start/Quick Start

4-2

12. FAVORITE (MEMORY COOK)

To set Stop/Clear Favorite Any mode

To cook Favorite

(FA-1)

Start

Start

Start

Start

Favorite

(FA-1)

SCHEMATIC DIAGRAM

4-3

CIRCUIT DESCRIPTION

GENERAL DETAILS

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

• When the door is closed, the primary switch is ON, the secondary switch is ON, and the monitor switch opens

(contact COM and NO).

WHEN SELECTING COOKING POWER

LEVEL AND TIME

• The micom controller memorizes the function you set.

• The time you set appears in the display window.

• Each indicator light turns on to indicate that the stage has been set.

WHEN TOUCHING THE START BUTTON

• The coil of the relay is energized by the micom controller.

• Power input is supplied to the high voltage transformer through the fuse to the primary switch and relay 4.

• Turntable rotates.

FUSE

PRIMARY

SWITCH power of oven as POWER LEVEL. (refer to page 1-1)

• One complete cycle of relay 4 is 32 seconds.

WHEN THE DOOR IS OPENED DURING

COOKING

• Both the primary switch and relay 4 are cut off primary winding voltage of the high voltage transformer.

• ON-OFF of relay 4 is coupled electrically with opening and closing of the secondary switch.

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

• The cooking time stops counting down.

• Relay stops functioning.

• As the door is opened, if the contact of primary switch fails to open, the fuse opens due to the large current surge caused by the monitor switch activation, which in turn stops magnetron oscillation.

L

FUSE

PRIMARY

SWITCH

MONITOR

SWITCH

H.V.

TRANS-

FORMER

N

L

N

MONITOR

SWITCH

H.V.

TRANS-

FORMER

MICOM CONTROLLER

RELAY 4

SECONDARY

SWITCH

MICOM CONTROLLER

RELAY 4

SECONDARY

SWITCH

• The fan motor rotates and cools the magnetron by blowing the air (coming from the intake on the back cover).

• The air is also directed into the oven to exhaust the vapor in the oven through the upper plate.

• Cooking time starts counting down.

• 3.2 volts AC is generated from the filament winding of the high voltage transformer. This 3.2 volts is applied to the magnetron to heat the magnetron filament through two noise-preventing choke coils.

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

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

WHEN TOUCHING THE START BUTTON

WITH THE HEATER COOKING

FUNCTION SELECTED

• The contacts of the primary switch and the secondary switch close the circuit.

• A.C. voltage is applied to the heater through thermostat as shown by the solid line.

L

N

L

G -Y

E

N

THERMOSTAT

RELAY 5,6,7

HEATER

WHEN THE OVEN IS SET AT ANY LEVEL

EXCEPT MAXIMUM.

• The micom controller controls the ON-OFF time of relay 4 by the applied signal to vary the average output

4-4

• Turntable rotates.

• The fan motor rotates.

• The air is also directed into the oven to exhaust the vapor in the oven through the base plate and back plate.

SERVICE INFORMATION

TOOLS AND MEASURING INSTRUMENTS

NECESSARY TOOLS

Tools normally used for TV servicing are sufficient.

Standard tools are listed below.

• Diagonal pliers

• Long nose pliers

• Phillips screwdriver

• Flat blade screwdriver

• Wrench (size 5mm)

• Nutdriver (size 5mm)

• Adjustable wrench

• Soldering iron

• Solder

• Vinyl insulation tape

• Polishing cloth

NECESSARY MEASURING INSTRUMENTS

• TESTER(VOLTS-DC, AC., Ohmmeter)

• Microwave survey meter

- Holaday HI-1500

HI-1501

- Narda 8100

8200

• Inch scale

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

1

/2 in.)

• Cylindrical and made of borosilicate glass vessel.

max. thickness: 3 mm outside diameter: approx. 190mm height: approx. 90mm

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

MICROWAVE LEAKAGE TEST

CAUTIONS

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

• The service personnel should inform the manufacture importer, or assembler of any certified oven unit found to have a microwave emission level in excess of 5 mW/cm 2 and should repair any unit found to have excessive emission levels at no cost to the owner and should ascertain the cause of the excessive leakage. The service personnel should instruct the owner not to use the unit until the oven has been brought into compliance.

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

- Tell the user not to operate the oven.

- Contact the manufacturer.

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

• Check for microwave leakage after every servicing.

The power density of the microwave radiation leakage emitted by the oven should not exceed 4 mW/cm 2 .

Always start measuring of an unknown field to assure safety for operating personnel from radiation leakage.

MEASURING MICROWAVE ENERGY

LEAKAGE

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

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

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

• Operate the oven at its maximum output.

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

Move probe along shaded area

Probe scanning speed

Less than 2.5 cm/sec

( 1in/sec)

5-1

MEASUREMENT WITH OUTER CASE

REMOVED

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

Special care should be taken in measuring the following parts. (Circled area of below Fig.)

- Around the magnetron

- The waveguide

WARNING : AVOID CONTACTING ANY

HIGH VOLTAGE PARTS

NOTES WHEN MEASURING

• Do not exceed meter full scale deflection.

• The test probe must be removed no faster than

1 inch/sec (2.5 cm/sec) along the shaded area, otherwise a false reading may result.

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

A false reading may result if the operator's hand is between the handle and the probe.

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

RECORD KEEPING AND NOTIFICATION

AFTER MEASUREMENT

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

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

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

MEASUREMENT WITH A FULLY

ASSEMBLED OVEN

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

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

NOTE: Leakage with the outer case removed less than

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

5-2

MEASUREMENT OF MICROWAVE POWER OUTPUT

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

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

190 mm.

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

• The initial temperature (±1) 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 shelf 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:

4187 X (

∆

T) + 0.55 X (T

2

- T

0

) X M

P =

T

• T

2

: Temperature after heating

• T

0

: Temperature of bowl

• M: Weight of bowl 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.

WATER LOAD

TURNTABLE

DISASSEMBLY AND ADJUSTMENT

A. OUTER CASE REMOVAL C. CONTROL PANEL ASSEMBLY

1) Disconnect the power supply cord from the outlet.

2) Remove the screws from the rear and along side edges of the case.

The outer case must be moved backward to be lifted off.

B. POWER SUPPLY CORD

1) Remove the outer case.

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

1) Disconnect the leadwire from the PCB SUB ASS’Y.

2) Remove the screws for the control bracket and securing the control panel.

3) Remove control panel ASS’Y from the oven by the moving control panel ASS’Y right side.

CAUTION: DISCHARGE THE HIGH VOLTAGE

CAPACITOR BEFORE SERVICING

(refer to page 2-1)

5-3

D. DOOR GROSS ASSEMBLY REMOVAL

1) Disconnect power.

2) Open the door from oven. insert “JIG” into the choke cover hole of door.

3) Lift the door from front cavity.

NOTE:

1. After replacing the door, be sure to check that the primary switch, monitor switch, and secondary switch operate normally.

2. After replacing the door, check for microwave energy leakage with a survey meter. Microwave energy must be below the limit of 5 mW/cm 2 . (with a 275 ml water load)

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

JIG

JIG

F. AIR GUIDE ASSEMBLY REMOVAL

1) Remove the screw on the Bracket upper and lift out the Bracket upper.

2) Remove the mounting screw from magnetron, upper chamber and front plate.

G. MAGNETRON REMOVAL

1) Remove controller assembly, Bracket upper and airguide from upper.

2) Disconnect the leadwire from the high voltage & choke filter transformer and Magnetron.

3) Carefully remove the mounting screws holding the magnetron and the wave guide.

4) Remove the magnetron until its dome is clear from the wave guide.

NOTE:

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

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

3. After replacing the magnetron, check for microwave leakage with a survey meter around the magnetron. Microwave energy must be below the limit of 5 mW/cm

2

. (With a 275 ml. water load).

Make sure that gasket is rigidly attached to the

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

31mm

10mm

5mm

15mm

28mm

Air-Guide

Choke Filter

Magnetron

Bracket upper

E. HIGH VOLTAGE TRANSFORMER

REMOVAL (Refer to page 5-5)

1) Discharge the high voltage capacitor.

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

3) Remove the screw holding the high voltage transformer to the Insulator-U.

5-4

H. FAN MOTOR ASSEMBLY REMOVAL

1) Remove controller assembly, air-guide, power cord, latch board-R from upper.

2) Disconnect the leadwire from fan motor, latch board-R and Noise filter.

3) Remove the three screws holding the the upper plate to the oven cavity.

4) Remove the fan motor ASS’Y to the upper plate.

I. HIGH VOLTAGE CAPACITOR, H.V. FUSE

TRANSFORMER AND DIODE REMOVAL

1) Discharge the high voltage capacitor.

2) Disconnect the leadwire from H.V. transformer, MGT,

H.V.Fuse and H.V. capacitor.

3) Remove the screw holding the H.V. transformer and remove the high voltage diode earth screw.

J. REMOVING THE TURNTABLE MOTOR

1) Remove the metal tray.

2) Remove the turntable shaft VERY CAREFULLY.

3) Lay the unit down on its back.

4) Remove the turntable motor cover.

The turntable base cover is easily removed by pinching the six parts with a wire cutting.

5) Disconnect the leadwire from the turntable motor terminals.

6) Remove the screw securing the turntable motor to the oven cavity Ass’y.

7) After repairing the motor, rotate the removed turntable motor cover.

8) Fit the turntable motor cover’s projecting part to the base plate slit and fasten a screw.

NOTE:

1. Remove the wire lead from the turntable motor

VERY CAREFULLY.

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

H.V.

Transformer

H.V.Fuse

Fan Motoer Assembly

H.V.

Capacitor

BKT H.V.C

H.V. Diode

5-5

Wire Leads

Turntable Motor

K. C-MOTOR, THERMISTOR

REMOVAL

1) Remove air-guide and controller assembly upper.

2) Disconnect the leadwire from the circulation motor terminal and oven thermostat.

3) Remove the screws of the thermistor, guide assychamber and lift up the guide assy-chamber.

4) Remove a hex nut securing the circulation fan to shaft of the C-motor.

5) Remove screws securing the motor shaft to the guide assy-chamber.

6) Remove hex nut securing the C-motor to the motor shaft.

PCB Holder

PCB Sub

(Tact S/W)

Control Panel

PCB Bracket

PCB Sub (Main)

Button

Circulation Motor

Oven Thermostat

Indicate

Deco.

Thermistor

M. INTERLOCK SYSTEM

1) INTERLOCK MECHANISM

The door lock mechanism is a device which has been specially designed to eliminate completely microwave activity when the door is opened during cooking and thus to prevent the danger resulting from the microwave leakage.

2) MOUNTING OF THE PRIMARY/MONITOR/

SECONDARY SWITCHES TO THE LATCH BOARD

ADJUSTMENT

DIRECTION

L. PCB ASSEMBLY REMOVAL

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

2) Remove screws which hold the PCB SUB ASS’Y to the PCB holder.

3) Remove the PCB holder & PCB Bracket.

4) Remove screws which hold the control panel.

5) Disconnect the flat cable from the PCB SUB

ASS’Y and take off the PCB SUB ASS’Y.

MONITOR

SWITCH

Right Left

PRIMARY

SWITCH

SECONDARY

SWITCH

5-6

3) INSTALLATION AND ADJUSTMENT OF THE

LATCH BOARD TO THE OVEN ASSEMBLY

• Mount the latch board to the oven assembly.

• Adjust the latch board in the arrow direction so that oven door will not have any play in it when the door is closed.

• Tighten the mounting screw.

N. UPPER HEATER REMOVAL

1) Remove the screw securing the air-guide to the upper.

2) Disconnect the leadwire from the sheath heater and main wire connector.

3) Remove the screws of the chamber-U.

4) Remove the chamber-U, air-tunnel-U.

5) Remove the screw securing of the reflector to sheath heater.

6) Remove the sheath heater from reflector.

7) Remove the screw securing of the heater support-F, B to reflector.

8) Remove the heater support-F, B of reflector.

9) Disconnect the leadwire from ceramic heater.

10) Remove the ceramic heater and halogen heater.

O. LOWER HEATER REMOVAL

1) Disconnect the leadwire from the sheath heater.

2) Remove the base plate from cavity.

3) Remove the nuts from the oven cavity of the side.

4) Remove the Gasket, Ring and Heater Bracket.

5) Remove the sheath heater in the oven cavity.

Halogen

Heater

Support-F

Chamber-U

Air-Tunnel-U

Support-B

Upper Sheath Heater

Ceramic

Heater

Reflector

Insulator-U

Lower Sheath Heater

Ring

Gasket

Heater Bracket

5-7

INTERLOCK CONTINUITY TEST

WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION

EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS.

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

TYPE NO. SZM-V 16-FA-61 OR VP-531A-OF FOR MONITOR SWITCH

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

A. PRIMARY INTERLOCK SWITCH TEST

When the door release button is depressed slowly with the door closed, an audible click should be heard at the same time or successively at intervals. When the button is released slowly, the latches should activate the switches with an audible click.

If the latches do not activate the switches when the door is closed, the switches should be a adjusted in accordance with the adjustment procedure. Disconnect the wire lead from the primary switch. Connect the ohmmeter leads to the common (COM) and normally open (NO) terminal of the switch. The meter should indicate an open circuit in the door open condition.

When the door is closed, the meter should indicate a closed circuit.

When the primary switch operation is abnormal, make the necessary adjustment or replace the switch only with the same type of switch.

COMPONENTS

SWITCHES

(Wire leads removed)

B. SECONDARY INTERLOCK SWITCH TEST

Disconnect the wire lead from the secondary switch.

Connect the ohmmeter leads to the common

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

C. MONITOR SWITCH TEST

Disconnect the wire lead from the monitor switch.

Connect the ohmmeter leads to the common

(COM) and normally closed (NC) terminals of the switch. The meter should indicate closed circuit in the door open condition. When the door is closed, meter should indicate an open circuit. When the monitor switch operation is abnormal, replace with the same type of switch.

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

TEST PROCEDURE

Check for continuity of the switch with a Multi-meter

Door open

RESULTS

Door close

Primary

Switch

COM

NO

Monitor

Switch

COM

NC

Secondary

Switch

NO

COM

NOTE: After checking for the continuity of switches, make sure that are correctly connected.

5-8

COMPONENT TEST PROCEDURE

CAUTIONS

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

OUTER CASE FROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH

VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE

HIGH VOLTAGE TRANSFORMER. (SEE PAGE 2-1)

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

OF WATER IN CONTAINER) IN THE OVEN.

COMPONENTS

HIGH VOLTAGE

TRANSFORMER

(Wire leads removed)

TEST PROCEDURE RESULTS

FILAMENT

WINDING

TERMINAL

SECONDARY

TERMINAL

PRIMARY

TERMINAL

MAGNETRON

(Wire leads removed)

1. Measure the resistance.

(Ohm-meter scale: Rx1 and Rx100)

• Primary winding

• Secondary winding

• Filament winding

2. Measure the resistance.

(Ohm-meter scale: Rx1000)

• Primary winding to ground

• Filament winding to ground

1. Measure the resistance.

(Ohm-meter scale: Rx1)

• Filament terminal

2. Measure the resistance.

(Ohm-meter scale: Rx1000)

• Filament to chassis

Approx.: 1.66 ohm

Approx.: 99.5 ohm

Less than: 1 ohm

Normal: Infinite

Normal: Infinite

Normal: Less than 1 ohm

Normal: Infinite

5-9

COMPONENTS

HIGH VOLTAGE

CAPACITOR

TEST PROCEDURE

Antenna

Gasket

Chassis

RESULTS

Filament

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.

Measure the resistance.

(Ohm-meter scale: Rx1000)

• Terminal to terminal.

Normal: Momentarily indicates several ohms, and then gradually returns to infinite.

Normal: Infinite.

Measure the resistance.

(Ohm-meter scale: Rx1000)

• Terminal to case.

HIGH VOLTAGE

DIODE

Measure the continuity (Forward).

(Ohm-meter scale: Rx10000)

Normal: Continuity.

Abnormal: Infinite.

NOTE :

Some inexpensive meters may indicate infinite resistance in both direction.

Measure the continuity (Reverse).

(Ohm-meter scale: Rx10000)

Normal: Infinite.

Abnormal: Continuity.

5-10

COMPONENTS

FUSE

H.V. FUSE

TEST PROCEDURE

Check for continuity of the fuse with an multi-meter.

RESULTS

Normal Abnormal

HEATER ELEMENT

(Wire leads removed.)

NOTE: If the fuse is blown, check the primary, the secondary, and the monitor switches, H.V.D. and H.V.C. before replacing the fuse.

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.

Measure the resistance.

(Multi-meter scale: Rx1)

Normal:

• Upper sheath heater:

Approx. 47 ohm (230V, 1100W)

• Lower sheath heater:

Approx. 74 ohm (230V, 700W)

• Upper Ceramic heater:

Approx. 27 ohm (120V, 500W)

• Upper Halogen heater:

Approx. 2.7 ohm (120V, 500W)

(at 20 ~ 30 o C)

Measure the resistance with 500V-100M ohm insulation resistance meter.

Normal: more than 0.5 Mohm

MAGNETRON and OVEN

THERMOSTAT

NOTE: Make sure heater is fully cooled when tested.

OVEN Thermostat 0°C~160°C 160°C

M.G.T Thermostat 0°C~Approx.145°C Approx.145°C

5-11

COMPONENTS

Disconnect the 4 pin connector from P.C.B.

(Refer to schematic diagram)

TEST PROCEDURE

Check for P.C.B. connector.

1 2 3 4

RESULTS

Cooking Start OFF

Cooking Start OFF RELAY OF P.C.B.

(Wire leads removed.)

Note: Relay

Relay 1: Fan motor

Circulation motor

Relay 2: Oven lamp

Turntable motor

Relay 3: P.T.C Relay

(Positive

Temperature

Coefficient)

Relay 4: Microwave

Relay 5: Up. sheath heater

Relay 6: Lo. sheath heater

Relay 7: Halogen+Ceramic

Heater

FAN MOTOR

(Wire leads removed)

Relay 1,2,3,4,5,6,7

Measure the resistance.

(Ohm-meter scale: R x 1)

Normal: Approx. 1.6 ohm

Abnormal: Infinite or several ohm.

TURNTABLE

MOTOR

(Wire leads removed)

Measure the resistance.

(Ohm-meter scale: R x 1000)

Normal: Approx. 10~20 kohm

Abnormal: Infinite or several ohm.

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

SERVICED FOR ANY REASON.

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

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

CONNECTOR, NOT THE WIRES.

5-12

COMPONENTS

CIRCULATION MOTOR

(Wire leads removed)

TEST PROCEDURE

Measure the resistance.

(Multi-meter scale : R x 1)

RESULTS

Normal : Approx. 165 ohm.

Abnormal : Infinite or several ohm.

KEY PCB Key P.C.B.

1

2

3

4

5

6

7

8

9

18

Main P.C.B

1

2

3

4

5

6

7

8

9

10

~

18

Check continuity between switch terminals, by pressing an appropriate pad on key board.

The contacts assignment of the respective pads on the key board is as shown left figures.

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.

5-13

TROUBLE SHOOTING

WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER, EVALUATE THE COMPLAINT CAREFULLY. IF

THE FOLLOWING SYMPTOMS APPLY, PLEASE INSTRUCT THE CUSTOMER IN THE PROPER USE OF THE

OVEN. THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL.

CAUTIONS

1. Check grounding before checking for trouble.

2. Be careful of the high voltage circuit.

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

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

5. Do not touch any part of the circuitry on the digital programmer circuit since static electric discharge may damage this control panel.

Always touch yourself ground while working on this panel to discharge any static charge built up in your body.

CONDITION

The oven does not work.

Output power is too low.

CAUSE

Inserting many plug into one plug outlet and using them at the same time

(causes overloading).

The oven plug is not inserted tightly.

Low AC input voltage.

REMEDY

Avoid using other electrical appliances when you use the oven.

Sparks occurring.

Uneven cooking.

Food temperature is too low.

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

Ceramic ware trimmed in gold or silver powder is used.

Inconsistent intensity of microwave by their characteristics.

Insert the oven plug securely.

Use the oven at adequate line voltage.

This may not be a defect.

It is possible that the food should be cooked for a longer time period.

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

Do not use any type of cookware with metallic trimming.

1. Wrap the thinner part with aluminum foil.

2. Use plastic wrap or lid.

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

5-14

(TROUBLE 1) The following visual conditions indicate a probable defective control circuit.

1. Incomplete segments.

• Segment missing.

• Partial segment missing.

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

2. Colon does not turn on or blink.

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

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

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

6. Display obviously jumps in time while counting down.

7. Display counts down too fast while cooking.

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

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

10. Beep sound is not heard when correct key is touched.

CONDITION

1. No input can be programmed.

2. Some inputs cannot be programmed.

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

4. Random programming when touching other pads.

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

CHECK

Check the connection between key assembly and PCB assembly.

Replace key assembly and check operation.

RESULT

Continuity.

No continuity.

Everything works as specified.

Still have trouble.

CAUSE

Defective PCB assembly.

Loose connection.

Defective key assembly.

Defective PCB assembly.

REMEDY

Replace PCB assembly.

Connect them tightly.

Replace key assembly.

Replace PCB assembly.

5-15

(TROUBLE 2) Oven does not operate at all ; Display window does not display any figures and no input is accepted.

CONDITION

1. Fuse blows.

CHECK

Check continuity of monitor switch (with door closed).

RESULT

Continuity.

No continuity.

CAUSE

Malfunction of the monitor switch.

REMEDY

Replace primary and monitor switches.

Replace fuse

Check continuity of primary switch (with door opened).

Continuity.

No continuity.

Shorted contact at the primary switch.

Replace primary and monitor switches.

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

Normal.

Fuse blows again

Defective high voltage capacitor.

Defective high voltage transformer.

NOTE : All these switches must be replaced at the same time. Refer to page 5-6, 5-8

Replace high voltage capacitor.

Replace high voltage transformer.

2. Fuse does not blow.

Check continuity of magnetron thermostat.

No continuity.

Continuity.

Check continuity of power supply cord.

No continuity.

Defective magnetron thermostat, oven thermostat and Lower voltage transformer.

Replace magnetron thermostat, oven thermostat and Lower voltage transformer.

Defective power supply cord.

Replace power supply cord.

5-16

(TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired program times are set and START button is touched.

CONDITION

1.Setting time does not count down when touching

START button.

CHECK

Check continuity of secondary switch (with door closed).

RESULT

No continuity.

continuity.

CAUSE

Defective secondary switch and secondary switch wire connector.

REMEDY

Replace secondary switch and secondary switch wire connector.

2. Fan motor, c-motor or oven lamp, turntable motor do not turn on.

Check the connection between connector and

P.C.B assembly.

Check fan motor, c-motor.

Check oven lamp, turntable motor.

No continuity.

Continuity.

Abnormal.

Abnormal.

Normal.

Defective P.C.B

assembly.

Loose connection.

Defective fan motor, c-motor.

Defective fan motor, c-motor.

Replace P.C.B

assembly.

Connection then tightly.

Replace fan motor, c-motor.

Replace fan motor, c-motor.

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

CONDITION

Output is low.

CHECK

Check the power source voltage.

RESULT

Lower than 90% of rating voltage.

Normal.

CAUSE

Decrease in power source voltage with load.

REMEDY

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

Replace P.C.B

assembly.

Disconnect the wire leads from relay 4 and check on and off time with multitester.

Abnormal.

Normal.

Defective P.C.B

assembly.

Measure the output power.

Abnormal.

Defective magnetron.

NOTE: Simple test of power output-conducted by heating one liter water for one min. if available.

Minimum 8.5

o C temperature rise is normal condition.

5-17

Replace magnetron.

(TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run

(Display operates properly)

RESULT CONDITION

No microwave oscillation.

CHECK

Disconnect the wire leads from relay 4 and check continuity of relay 4.

(Operate the unit)

No continuity.

Continuity.

CAUSE

Defective P.C.B

assembly

REMEDY

Replace P.C.B

assembly

Check H.V.

transformer and

H.V. Fuse.

Abnormal normal

Defective high voltage transformer and

H.V. Fuse.

Replace high voltage transformer and

H.V. Fuse.

Check H.V.

capacitor.

Abnormal normal

Defective high voltage capacitor.

Replace high voltage capacitor.

Check H.V.

diode.

Abnormal normal

Defective high voltage Diode.

Replace high voltage Diode.

Check

Magnetron.

Abnormal

Defective magnetron.

Replace magnetron .

5-18

(TROUBLE 6) Oven does not cook properly when programmed for the set power level

(Operates properly on HIGH)

CONDITION

1. Heater is not operating.

CHECK

Heater.

RESULT

Abnormal.

CAUSE

Output is full when you set lower power level.

Disconnect the wire leads from relay 4 and check continuity relay 4.

(Operate the unit)

Abnormal.

Defective P.C.B.

assembly.

(TROUBLE 7) Heater Relay 5- Up. sheath Heater

Relay 6- Lo. sheath Heater

Relay 7- Halogen + Ceramic Heater

CONDITION CHECK RESULT CAUSE

Malfunction of the heater.

Normal.

REMEDY

Replace P.C.B.

assembly.

REMEDY

Replace.

Thermostat and relay 5, 6, 7.

Abnormal.

Normal.

No continuity.

Malfunction of the thermostat and relay 5,6,7

Replace.

Wire connection.

2. Lower temperature the oven.

Heater.

Open or loosen.

Replace or connect tightly.

Malfunction of the heater.

Replace. Abnormal.

Normal.

Thermostat and relay 5, 6, 7.

Abnormal.

Malfunction of the thermostat and relay 5,6,7

Replace.

NOTE: * Make sure the wire leads correct position.

* When removing the wire leads from parts, Be sure to grasp the connector not the wires.

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

5-19

#EV#

INTRODUCTION

MODEL: MP-9482S

EXPLODED VIEW

INTERIOR PARTS

CONTROL PANEL PARTS

DOOR PARTS

OVEN CAVITY PARTS

BASE PLATE PARTS

LATCH BOARD PARTS

6-1

#EV#

DOOR PARTS

140262

14970A

13581A

WPZ016

13213E

WTP002

13552A

140261

WTT028

14890E

WTT028

14970A

WPZ016

13720D

13650A

6-2

#EV#

CONTROL PANEL PARTS

24781M

24810P

24980A

• discard original & replace with Part Supplied in Kit

- Must Change Simultaneausly

- Original P/No : (6871W1S074A)

(6871W1S260J)

(6871W1S112A)

268711

WTT028

23551A

250201

268712

WTP004

WTT028

WTP004

WTP004

249401

24402A

243501

268713

250201

6-3

#EV#

OVEN CAVITY PARTS

• discard original & replace with Part Supplied in Kit (Tray & Shaft)

Before

35026C

35026G

33112U

P/NO : 3390W1A013D 4370W1A004B

After

33390M

34370T

WTT021

WNZ015

33052M

WTT010

343501

368771

WNZ015

34810H

35300S

54790A

WTT028

63303A

6-4

647781

WTT028

36549S

WTP013

647781

WTT028

63302A

#EV#

LATCH BOARD PARTS

WSZ085

43501L

466001

43500L

6-5

WSZ085

43500R

43501R

466001

466003

44510A

#EV#

INTERIOR PARTS (I)

WTT028

56201B

56324A

WSZ002

WSZ209

552652

WTT021

WTT028

53504A

55264A

35300E

53550L

56912B

350122

34890C

WTT028

WTT021

WSZ209

6-6

552651

#EV#

INTERIOR PARTS (II)

54975A

WSZ002

WTT021

56901A

56549F

56930M

350121

33660A

WNH002

55900A

WWP008

WNH003

WTT021

56170D

WTP002

56322A

54810C

56851D

WWS005

50FZZA

56201A

50CZZH

54980A

WTT028

54811A

WTP002

56930V

WSZ002

56411A

36549C

36549W

568771

6-7

SCHEMATIC DIAGRAM OF P.C.B

8-1

PRINTED CIRCUIT BOARD (Key P.C.B.1)

8-2

PRINTED CIRCUIT BOARD (Key P.C.B.2)

8-3

PRINTED CIRCUIT BOARD (Power P.C.B.2)

8-4

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