Daewoo KOR-816T2S Service Manual

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Page 1

Service Manual

Microwave Oven

Model: KOR-616T2S

KOR-816T2S

DAEWOO ELECTRONICS CO., LTD.

✔

Caution

: In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information,please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr).

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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.

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

PROPER USE AND SERVICE PRECAUTIONS....................................................................................................2

SPECIFICATIONS ...................................................................................................................................................3

FEATURE DIAGRAM...............................................................................................................................................4

EARTHING INSTRUCTIONS..................................................................................................................................5

INSTALLATION........................................................................................................................................................5

OPERATION PROCEDURES .................................................................................................................................6

CONTROLS .............................................................................................................................................................7

INTERLOCK MECHANISM FUNCTIONS AND ADJUSTMENTS........................................................................17

MEASUREMENT OF THE MICROWAVE OUTPUT POWER..............................................................................19

MICROWAVE RADIA TION TEST..........................................................................................................................20

WIRING DIAGRAM................................................................................................................................................21

CIRCULT DESCRIPTION......................................................................................................................................23

SAFETY PRECAUTIONS FOR DISASSEMBLY AND REPAIR...........................................................................26

DISASSEMBLY AND ASSEMBLY.........................................................................................................................27

TROUBLE SHOOTING GUIDE.............................................................................................................................32

COMPONENT TEST PROCEDURE.....................................................................................................................37

SAFETY INTERLOCK CONTINUITY TEST ......................................................................................................... 38

PRINTED WIRING BOARD...................................................................................................................................39

CIRCUIT CHECK PROCEDURE.....................................................................................................................39

P.C.B. CIRCUITS DIAGRAM............................................................................................................................45

PRINTED CIRCUITS BOARD..........................................................................................................................47

P.C.B. LOCATION NO ...................................................................................................................................... 49

EXPLODED AND PARTS LIST.............................................................................................................................51

TABLE OF CONTENTS

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CAUTION: 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 USE AND SERVICE PRECAUTIONS

1. For Safe Operation Damage that allows the microwave energy(that cooks or heats the food) to escape will result in poor cooking and may cause serious bodily injury to the operator. IF ANY OF THE FOLLOWING CONDITIONS EXIST, OPERATOR MUST NOT USE THE APPLIANCE. (Only a trained service personnel should make repairs.)

1) A broken door hinge.

2) A broken door viewing screen.

3) A broken front panel, oven cavity.

4) A loosened door lock.

5) A broken door lock. The door gasket plate and oven cavity surface should be kept clean. No grease, soil or spatter should be allowed to build up on these surfaces or inside the oven. DO NOT ATTEMPT TO OPERATE THIS APPLIANCE WITH THE DOOR OPEN. The microwave oven has concealed switches to make sure the power is turned of f when the door is opened. Do not attempt to defeat them. DO NOT ATTEMPT TO SERVICE THIS APPLIANCE UNTIL YOU HAVE READ THIS SERVICE MANUAL.

2. For Safe Service Procedures.

1) If the oven is operative prior to servicing, a microwave emission check should be performed prior to

servicing the oven.

2) If any certified oven unit is found to have excessive emission level 5mW/cm2, the service

person should: (a) inform the manufacturer, importer or assembler, (b) repair the unit at no cost to the owner, (c) attempt to ascertain the cause of the excessive leakage, (d) tell the owner of the unit not to use the unit until the oven has been brought into compliance.

3) If the oven operates with the door open, the service person should tell the user not to operate the

oven and contact the manufacturer and CDRH immediately.

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SPECIFICATIONS

Specifications KOR-816T2S KOR-616T2S

Power Supply 230V ~ 50Hz, SINGLE PHASE WITH EARTHING

POWER CONSUMPTION 1350 W 1200 W

MICROWAVE OUTPUT POWER 900 W (IEC 705) 800 W (IEC 705)

FREQUENCY 2450 MHz OUTSIDE DIMENSIONS (W x H x D) 495 x 289 x 409 mm 465 x 274 x 379 mm CA VITY DIMENSIONS (W x H x D) 320x 225 x 330 mm 290x 200 x 290 mm NET WEIGHT APPROX. 15.0Kg APPROX. 13.5Kg TIMER 60 min. 00 sec POWER SELECTIONS 5 LEVELS

495

409

289

Stop Defrost

1 2 WeightQuantity Time

Lock Auto cook Watt g

Power Defrost+1min

Auto Cook

STOP

START

CLEAR

Speedy

Less

Clock

1. Beveroge

2. Soup

3. Casserole

4. Vegetable

5. Fish Fillets

(465)

(274)

(379)

* Specifications subject to change without notice.

( ) : For KOR-616T

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FEATURES DIAGRAM

Power Defrost+1min

Auto Cook

STOP

START

CLEAR

Speedy

Less

Clock

1. Beveroge

2. Soup

3. Casserole

4. Vegetable

5. Fish Fillets

Stop Defrost

1 2 WeightQuantity Time

Lock Auto cook Watt g

Power Defrost+1min

Auto Cook

STOP

START

CLEAR

Speedy

Less

Clock

1. Beveroge

2. Soup

3. Casserole

4. Vegetable

5. Fish Fillets

Stop Defrost

1 2 WeightQuantity Time

Lock Auto cook Watt g

1 2 3

0 q

1 Door latch - When the door is closed it will automatically lock shut. If the door is opened while the

oven is operating, magnetron will immediately stop operating.

2 Door seal - Door seal maintains the microwave energy within the oven cavity and prevents microwave

leakage.

3 Oven cavity. 4 Spatter shield - Protects the microwave outlet from splashes of cooking foods. 5 Safety interlock system. 6 Door viewing screen - Allows viewing of food. The screen is designed so that light can pass through,

but not the microwaves.

7 Glass cooking tray - Made of special heat resistant glass. Food in a proper receptacle is placed on

this tray for cooking.

8 Roller guide - This must always be used for cooking together with the glass cooking tray. 9 Display - Cooking time, power level, present time are displayed. 0 q e Function buttons - Used to select desired oven operation.

: MICROWAVE, DEFROST, AUTOCOOK.

w +1 min. button - Used to increase time of operating. r Start button - Used to start a selected operation. When lamp blinks, press the start button.

Speedy cook button - Used to set desired time.(It is incresed 30 seconds.)

t Stop/clear button - Used to pause or clear all information manually put into the oven control panel

except clock.

y u More/Less button - Used to select auto cook time. (More/less 10% of auto cook time) i Clock button - Used to set and recall the time of day. o Dial knob - Used to set the cooking time, weight and quantity. p Guide lamp - When blinking it informs you to be ready to operte dial knob.

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Steady , flat location.

This oven should be set on a steady, flat surface. This oven is designed for counter top use only.

Leave space behind and side.

All air vents should be kept a clearance. If all vents are covered during operation, the oven may overheat and, eventually, oven failure.

Away from Radio, and TV sets

Poor television reception and radio interference may result if the oven is located close to a TV, Radio, or antenna, feeder and so on. Position the oven as far from them as possible.

Away from heating appliances and water taps

Keep the oven away from hot air, steam or splash when choosing a place to position it, or the insulation might be adversely affected and breakdowns occur.

Power supply

• Check your local power source. This oven requires a current of approximately 6 amperes, 230V 50Hz.

• Power supply cord is about 1.0 meters long.

• The voltage used must be the same as specified on this oven. Using a higher voltage may result in

a fire or other accident causing oven damage. Using low voltage will cause slow cooking. We are not responsible for damege resulting from use of this oven will a voltage of ampere fuse other than those specified.

• This appliance is supplied with cable of special type, which, if damaged, must be repaired with

cable of same type. Such a cable can be purchased from DAEWOO and must be installed by a Qualified Person.

Examine the oven after unpacking for any damage such as:

A misaligned door , Broken door, A dent in cavity. If any of the above are visable, DO NOT INSTALL, and notify dealer immediately.

Do not operate the oven if it is colder than room termperature.

(This may occur during delivery in cold weather.) Allow the oven to become room temperature before operating.

EARTHING INSTRUCTIONS

INSTALLATION

WARNING:

Improper use of the earthing plug can result in a risk of electric shock. Consult a qualified electrician or serviceman if the earthing instructions are not completely understood, or if doubt exists as to whether the appliance is properly earthed. If it necessary to use an extension cord, use only a 3-wire extension cord that has a 3-blade earthing plug, and a 3slot receptacle that will accept the plug on the appliance. The marked rating of the extension cord should be equal to or greater than the electrical rating of the appliance.

This appliance must be earthed. In the event of an electrical short circuit, earthing reduces the risk of electric shock by providing an escape, wire for the electric current. This appliance is equipped with a cord having a earthing wire with a earthing plug. The plug must be plugged into an outlet that is properly installed and earthed.

1 2

4 5

6 7

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When the oven door is opened, the light turns off.

The oven door can be opened at any time during operation by touching the door release button on the control panel. The oven will automatically shut off. To restart the oven, close the door and then touch START.

Each time a pad is touched, a BEEP will sound to acknowledge the touch.

The oven automatically cook on full power unless set to a lower power level.

The display will show “ :0” when the oven is plugged in.

Time clock returns to the present time when the cooking time ends.

When the STOP/CLEAR pad is touched during the oven operation, the oven stops cooking and all information retained. To erase all information (except the present time), touch the STOP/CLEAR pad once more. If the oven door is opened during the oven operation, all information is retained.

If the START pad is touched and the oven does not operate, check the area between the door and door seal for obstructions and make sure the door is closed securely. The oven will not start cooking until the door is completely closed or the program has been reset.

Wattage output chart

• The power-level is set by pressing the M/W pad. The chart shows the display, the power level and the

percentage of power .

( ) : For KOR-616T

OPERATION PROCEDURE

1 2

3 4

6 7

This section includes useful information about oven operation.

1. Plug power supply cord into a 230V 50Hz power outlet.

2. After placing the food in a suitable container, open the oven door and put it on the glass tray. The glass tray must always be in place during cooking.

3. Shut the door. Make sure that it is firmly closed.

Make sure the oven is properly installed and plugged into the electrical outlet.

Touch Power pad,

Power Level (Display)

Approximate Percentage

Once the Touch of Power

5 900W (800W) 100% 4 700W (650W) 80% 3 500W (450W) 60% 2 350W (300W) 40% 1 150W (140W) 20%

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Tips: • Be sure to read the cookbook's introduction before operating the oven.

• Also remember to read this operating instruction for proper safety information and instruction bfore using the oven.

• See the cookbook for specific recipes.

• Prior to setting the controls, place one cup of water in the oven, in a heat-proof glass measuring cup, for testing purposes.

• When setting the controls, everytime a button is pressed, a beep can be heard.

• If you don't take off the food after end cooking, buzzer will sound as 1 minute.

CONTROLS

CLOCK

NOTE:

• When the oven is plugged in, “0:00”appears in the display window .

• The two dots between the hour and minute are the clock indicator lights. They will start to flash on and off.

• The time of day will be displayed at all times, except when the oven is operating.

• In the oven of a power failure or if the oven is unplugged, the clock will have to be reset for the proper time. Once power is restored or oven is plugged in, the display will show “0:00”.

• To reset the time of day , repeat the steps given below.

• To check the time of day while the oven is poerating, press the CLOCk button, then the time will be displayed for 3 seconds.

• When you turn DIAL KNOB, minutes are increased by to turn right and hours are increased as to turn left.

SETTING THE CONTROL

1. Press CLOCK button. If you push the CLOCK button once again, you can select 12 hour clock system. Then guide lamp will starts blinking.

This example is 24 hour clock system.

NOTE: This oven is mul-

tiple clock system.

2. Turn left the DIAL KNOB for hour you want.

NOTE:

• If you selected 12 hour clock system, this digital clock allows you to set from 1:00 to 12:59.

• If you selected 24 hour clock system, this digital clock allows

you to set from 0:00 to 23:59.

• The colon will stop blinking.

3. Turn right the DIAL KNOB for minute you want.

NOTE: If you are not setting current time for 3 seconds, display return to old time.

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TIME DEFROST

SETTING THE CONTROL

1. Press DEFROST button twice.

This TIME DEFROST indicator light will light up.

Time

4. Press CLOCK button. The display will show present

time, and the colon starts blinking. This digital clock allows you to set to “10:10”

2. Turn the DIALKNOB for the desired defrosting time.

For example: 20 minutes.

20:00 will show in the display.

Time

3. Press button.

The TIME DEFROST indicator light will start blinking to show the oven is in TIME DEFROST mode.

Time

NOTE: During the defrosting operation, turn over after buzzer sound for completed defrosting.

NOTE: Time can be set up

to 60 minutes.

4. Buzzer will sound at the end of the cooking time. The indicator light will go off. The display panel will return to the time of day . The oven light will turn off and the turntable will stop turning.

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WEIGHT DEFROST

SETTING THE CONTROL

1. Press DEFROST button once.

The WEIGHT DEFROST indicator light will come on. The g indicator light will start blinking.

Weight

2. Turn the DIAL KNOB for the desired defrosting weight.

For example: 1000g

The 1000 will show in the display. It is represent 1000g

Weight

3. Press button.

The WEIGHT DEFROST indicator light will start blinking to show the oven is in WEIGHT DEFROST mode.

Weight

NOTE: During the defrosting operation, turn over the food after buzzer sound for completed defrosting.

NOTE:• This digital weight allows you set from 200g to 3000g.

• Whenever you press this button, the display is circulated WEIGHT DEFROST, TIME DEFROST, and MICROWAVE mode.

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COOKING IN ONE STAGE

SETTING THE CONTROL

1. Press POWER button By repeatedly pressing this button, you can also select other power levels.

For example: KOR-616T

The ST AGE1 indicator light will light. The WATT indicator light start blinking.

Watt

Stage

2. Turn the DIALKNOB for the desired cooking time.

For example: 10 minutes

10:00 will show in the display.

Stage

3. Press button.

The ST AGE1 indicator light will starts blinking to show the oven is in MICROWAVE mode.

Stage

NOTE:

• To insure the best microwave and defrost results, be sure to start with a cool oven. Let the oven cool 15~20minutes with the door slightly open.

• Power levels are 900W, 700W, 500W, 350W, 150W(KOR-816T) or 800W, 650W, 450W, 300W and 140W(KOR-616T)

• It is displayed after an interval of 10 seconds from 10 seconds to 5 minutes, 30 seconds from 5 minutes to 10 minutes, 1 minute from 10 minutes to 60 minutes.

NOTE: Time can be set up

to 60 minutes.

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COOKING IN TWO STAGES

SETTING THE CONTROL

1. Press POWER button more than three times. By repeatedly pressing this button, you can also select other power levels.

For example: KOR-616T

The ST AGE1 indicator light will light. The WATT indicator light start blinking.

Watt

Stage

2. Turn the DIAL KNOB for the desired cooking time.

For example: 10 minutes

10:00 will show in the display.

Stage

3. Press POWER button By repeatedly pressing this button, you can also select other power levels.

For example: KOR-616T

The ST AGE2 indicator light will light The WATT indicator start blinking.

Watt

Stage

4. Turn the DIAL KNOB for the desired cooking time.

For example: 18minutes

18:00 will show in the display.

Stage

NOTE:

For best results, some recipes call for one power level for a certain length of time and another power level for a different length of time.

NOTE: Time can be set up

to 60 minutes.

NOTE:

Time can be set up

to 60 minutes.

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5. Press button.

When you touch ST AR T, both ST AGE1 & 2 indicator lights come on. ST AGE1 indicator light blinking to show you that the oven is cooking in the first of two cook stages. The oven will cook at the power you selected for stage 1.

1 2

Stage

At the end of stage 1, the oven will beep and start the second stage 2. The ST AGE1 indicator light will go of f and the ST AGE2 indicator light starts blinking. The display counts down the time to show you how much cooking time is left in the second stage.

Stage

6. Buzzer will sound at the end of the cooking time. The indicator light will go off. The display panel will return to the time of day . The oven light will turn of f and the turntable will stop turning.

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AUTO COOK

SETTING THE CONTROL

1. Press AUTO COOK button The AUTO COOK indicator light will light “AC-1” will show in the display.

Quantity

Auto cook

2. Select the desired cooking.

For example: SOUP Press AUTO COOK button

twice.

“AC-2” will show in the display . The quantity indicator light will start blinking

Auto cook

Quantity

4. Turn the DIAL KNOB for

desired cooking quantity.

Auto cook

5. Select the desired cooking

quantity . For example: 3(350g)

“3” will show in the display.

Auto cook

3. If you want to select other menu, press AUTOCOOK button until display your desired cooking menu.

NOTE: •

There is programmed for cooking of five kinds (1~5)

• You don't have to worry about setting time, power and function.

You can operate MORE or LESS than programmed time as pressing MORE or LESS button whenever MORE or LESS button, display is changed “10” or “-10”.

10: Adds 10% for programmed time.

-10: Romove 10% for prjogrammed time.

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7. Press button.

This example don't set MORE or LESS function.

For example: KOR-616T

The oven will now start auto cook for menu2. The indicator light starts blinking.

Auto cook

NOTE:

• AUTO COOK menu and quantity.

6. If you want to select other, turn the dial Knob until display you desired.

8. Buzzer will sound at the end of the cooking time. The indicator light will go off. The display panel will return to the time of day . The oven light will turn off and the turntable will stop turning.

MENU NO QUANTITY NO

1 1 CUP

1 BEVERAGE 2 2CUPS

3 3CUPS 1 250g

2 SOUP 2

300g

350g

400g

200g

3 CASSEROLE 2 400g

600g

800g

250g

4 VEGETABLE 2

300g

350g

400g

300g

400g

5 FISH FILLET 3 500g

600g

700g

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1. Press button. Then start lamp will start blinking.

Whenever the button is pressed, cooking time is increased 30 seconds. If the time was setting, this oven is operated automatically after 2 seconds to microwave high power.

STAGE COMVINATIONS

This oven has the ability to be programmed to do up to three consecutive functions. These combinations are five below and either the complete program or part of it can be used.

* When you set stage mode, indicator is lighted only setting. * When you press START button, all indicators are lighted setted function.

Indicator of operating function is blinking.

SPEEDY COOK

+1 min.

CHILD SAFTY LOCK

SETTING THE CONTROL

NOTE: This key is increased from 30 seconds to 5 minutes.

If you are pressing more than about 0.5 seconds, the time is increased 30 seconds

continuously .

• The safty lock prevents unwanted oven operation such as by small children.

• To set, press STOP/CLEAR for 3 seconds, lock indicator light starts blinking.

• To cancel, press STOP/CLEAR for 3 seconds, lock indicator goes off.

• The function can use when oven is working state.

• Whenever press this button, time is increased as 1 minute.

• Time is increased until 60 minutes.

STAGE COOKING

STAGE 2 (M/W)

TIME / WEIGHT DEFROST

STAGE 1 (M/W)

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TO STOP THE OVEN WHILEITIS OPERA TING

ERASING INSTRUCTIONS

GENERAL COOKING HINTS

1. When cook a roast with an excess amount of drippings, it is helpful to remove the drippings at turnover time to prevent spattering.

2. Prick the meats, fish or poultry with a fork to prevent bursting. Steam builds up pressure in meats, fish or poultry which are tightly covered by a skin or membrane.

3. Reduce suggested cooking times, It is always better to undercook foods rather than to over-cook them. If a range of times is stated in a recipe, cook the minimun suggested time, check for doneness, and then cook slightly longer if necessary.

NOTE:

Oven stops operating when door is opened.

• TOUCH (STOP/CLEAR)button to erase all instructions you set previously.

• Opening the oven door during cooking dose not erase cooking instruction.

• If you push twice button during operation, the cooking instruction is all erased.

1. Press (STOP/CLEAR) button.

-Touch once more to erase all instruction except clock.

-You can restart the oven by touching (START) button.

2. Open the door

-You can restart the oven by closing the door and touching button.

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

(1) Primary interlock switch

When the door is closed, the hook locks the oven door. If the door is not closed properly the oven will not operate. When the door is closed, the hook pushes the button of the micro switch. Then the button of the primary interlock switch bring it under on condition.

Adjustment 1.

When the door is closed, the switch button is pushed by the hook. The movement of the switch button should exceed 1.2mm measured at the top of the button.

INTERLOCK MECHANISM FUNCTIONS AND ADJUSTMENTS

Latch Mounting serew

Button

Primary interlock switch

Hook

1.2mm

Page 19

Adjustment 2. Interlock monitor switch

When the door is closed, the interlock monitor switch should be opened before other switches close. When the door is opened, the interlock monitor switch should be closed after other switches open.

Secondary interlock switch

The movement of the switch button should exceed 1.2mm measured at the top of the button.

(3) Adjustment steps

a) Loosen the two mounting screws. b) Adjust interlock switch assembly position. c) Confirm the gap (1.2mm) described above. d) Make sure that push lever moves smoothly after adjustments in completed. e) Completely tighten the two mounting screws.

(4) Interlock switch resplacement

Whenever safety interlock switch are replaced:

1) Refer to the following diagram.

2) Check the connection of monitor switch after replacement.

3) Perform the electrical continuity check of interlock switches and microwave emission test mentioned in this manual.

Secondary interlock switch

Interlock Monitor switch

Primary interlock switch

RD RD

NOTE: Microwave emission test should be performed after adjusting interlock mechanism. If the

microwave emission exceed 4mW/cm2, readjust interlock mechanism.

SYMBOL COLOR

RD RED

WH WHITE

BK BLACK

BL BLUE

(2) Secondary interlock switch and interlock monitor switch

When the door is closed, the hook pushes the push lever down ward, the push lever presses the button

of the interlock monitor switch to bring it under “off”, condition and presses the button of the secondary interlock switch to bring it under “on”, condition.

Secondary interlock switch

Hook

Monitor interlock switch

Push lever

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MEASUREMENT OF THE MICROW AVE OUTPUT POWER

Microwave output power can be checked by indirectly measuring the temperature rise of a certain amount of water exposed to the microwave as directed below .

Procedure

1. Microwave power output measurement is made with the microwave oven supplied at rated voltage and operated at its maximum microwave power setting with a load of 1,000±5cc of potable water.

2. 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.

3. The oven and the empty vessel are at ambient temperature prior to the start of the test. The initial temperature of the water is 10±2°C (50± 3.6°F). 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 normal position.

4. Microwave power is switched on.

5. Heating time should be exactly 47 seconds (KOR816T) or 52 seconds (KOR-616T).

Heating time is measured while the microwave generator is operating at full power. The filament heat-up time for magnetrons is not included.

6. The initial and final water temperatures are selected so that the maximum difference between the ambient and final water temperatures is 5K.

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

•

▲▲T is actual temperature rise.

• t is the heating time. The power measured should be 900W(KOR-816T) 800W(KOR-616T) ±10%

CAUTION:

1. Water load should be measured exactly to 1 liters.

2. Input power voltage should be exactly 230 volts as specified.

3. Ambient temperature should be 20±2°C (68±3.6°F)

P = 4187 x ▲▲T/t

Water Load

Tray

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WARNING Make sure to check the microwave leakage before and after repair or adjustment.

• Always, start measuring of an unknown field to assure. Safety for operating personnel from microwave energy.

• Do not place your hands into any suspected microwave radiation field unless the safe density level is known.

• Care should be taken not to place the eyes in direct line with the source of microwave energy.

• Slowly approach the unit under test until the radiometer reads an appreciable microwave leakage from the unit under the test.

Procedure

A) Prepare Microwave Energy Survey Meter, 600cc glass beaker, glass thermometer 100°C or 212°F. B) Pour 275cc±15cc of tap water initially at 20±5°C (68±9°F) in the 600cc beaker with an inside diameter of

approx. 8.5cm (3.5 in). C) Place it at the center of the tray and set it in a cavity . D) Close the door and operate the oven. E) Measure the leakage by using microwave energy survey meter with dual ranges, set to 2,450 MHz.

-Measured radiation leakage must not exceed the values prescribed below.

• Leakage for a fully assembled oven with door normally closed must be less than 4mW/cm

-When measuring the leakage, always use the 2 in (5cm) space cone with probe. Hold the probe perpendicular to the cabinet, door. Place the space cone of the probe on the door, cabinet, door seam, door viewing screen, the exhaust air vents and the suction air vents.

-Measuring should be in a counter-clockwise direction at a rate of 1 inch/sec. If the leakage of the cabinet door seam is unknow, move the probe more slowly.

-When measuring near a corner of the door, keep the probe perpendicular to the areas making sure the probe end at the base of the cone does not get closer than 2 inches from any metal.

If it does, erroneous reading may result.

MICROW AVE RADIA TION TEST

Stop Defrost

1 2 WeightQuontity Time

Lock Auto cook Watt ozl

Power Defrost+1min

Auto Cook

STOP

START

CLEAR

Speedy

Less

Clock

1. Beveroge

2. Soup

3. Casserole

4. Vegetable

5. Fish Fillets

Page 22

POWER SUPPLY:

SINGLE PHASE ONLY

FILTER ASS’Y

FUSE

BR(BK)

BL(WH)

GE(GN)

N N

RD RD

D.O.M. SWITCH

SECONDARY

INTERLOCK SWITCH

RELAY-2

RELAY-1

CONTROL P.W.B. ASS’Y

RD WH

COM

PRIMARY

INTERLOCK

SWITCH(UPPER)

INTERLOCK

MONITOR

SWITCH

HIGH VOLTAGE

TRANSFORMER

RD RD

H.V.

CAPACITOR

MAGNETRON

H.V. DIODE

GY GY

CL GM FM

NOTE RD : RED OR : ORANGE CL : CAVITY LAMP (CONDITION)

WH : WHITE BL : BLUE FM : FAN (BLOWER) MOTOR DOOR : CLOSED

BK : BLACK GY : GRAY GM : GEARED MOTOR COOK : OFF

GN : GREEN GE : GREEN/YELLOW

BR : BROWN

L R

H.V.

FUSE

WIRING DIAGRAM

Fig. 1

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POWER SUPPLY:

SINGLE PHASE ONLY

FILTER ASS’Y

FUSE

BR(BK)

BL(WH)

GE(GN)

N N

RD RD

D.O.M. SWITCH

SECONDARY

INTERLOCK SWITCH

RELAY-2

RELAY-3(SLOW ACTING)

RELAY-1

CONTROL P.W.B. ASS’Y

RD WH

COM

PRIMARY

INTERLOCK

SWITCH(UPPER)

INTERLOCK

MONITOR

SWITCH

HIGH VOLTAGE

TRANSFORMER

RD RD

H.V.

CAPACITOR

MAGNETRON

H.V. DIODE

GY GY

CL GM FM

NOTE RD : RED OR : ORANGE CL : CAVITY LAMP (CONDITION)

WH : WHITE BL : BLUE FM : FAN (BLOWER) MOTOR DOOR : CLOSED

BK : BLACK GY : GRAY GM : GEARED MOTOR COOK : OFF

GN : GREEN GE : GREEN/YELLOW

BR : BROWN

L R

H.V.

FUSE

SLOW ACTING

RESISTOR

WIRING DIAGRAM(SLOW ACTING RELAY TYPE)

Fig. 1-1

Page 24

Refer to the “WIRING DIAGRAM” (Fig. 1) on page 21~22.

MICROWAVE COOKING TIME COOKING

1. When the food is placed incide the oven and door is closed.

1) The low voltage transformer supplies the necessary voltage to the touch control circuit when the power cord is plugged in.

2) The contacts of the interlock monitor switch open. This switch creates short circuit to blow 12A fuse and stop magnetron oscillation when door is opened during operation under abnormal condition (i.e. the contacts of primary interlock switch do not open the circuit).

3) The contacts of primary interlock switch close the primary circuit.

2. When cooking cycle, power and time are set by touching the function pads and the desired numerical pads.

1) The function indicating bars are located on the digitron light to indicate that function have been set.

2) The time you set appears in the display window.

3) The touch control circuit memorizes the cooking program you set.

3. When the start button is touched.

* The RELAY “1”, “2” are controlled by the touch control circuit.

1) 230V AC is applied to the high voltage transformer through the contacts of RELAY “

1”(See Fig.1)

2) Fan motor starts rotating and cools the magnetron by blowing the air coming from the intake on the rear plate hole.

3) The oven lamp light the inside of the oven.

4) Indicator light turns on to indicate function operation. Cooking time starts count down.

5) 3.3 Volts AC is generated from the filament winding of the high voltage transformer. This filament voltage is applied to the magnetron to heat the magnetron filament through two noise preventing choke coils.

6) A high voltage of 2000 Volts AC is generated in the secondary of high voltage transformer and this secondary voltage is increased by the action of the diode and the charging of the high voltage capacitor. This resultant DC voltage is then applied to the anode of the magnetron. As shown in Fig. 2 the first half cycle of the high voltage produced in the high voltage transformer secondary charges the high voltage capacitor. Current flow is in the direction of the dotted-line during the second half cycle, the voltage produced by the transformer secondary, and the charge of the high voltage capacitor are combined and applied to the magnetron as shown by the solid line so that oscillations begin. The disturbance wave generated by the magnetron is prevented by the choke coils of 3.2µH, filter capacitors of 16pF and the magnetron’s shielded case so that TV and radio programs are not impaired by noise.

CIRCUIT DESCRIPTION

Page 25

Fig.2

The touch control circuit controls the ON-OFF time of RELAY “1” in order to vary the output power of the microwave oven from “power level 1” to “5 (100%) power”. One complete ON and OFF cycle of the RELAY “1” is 29 seconds. The relation between indications on the control panel and the output of the microwave oven is as shown is Fig. 3

H.V FUSE

H.V. DIODE

MAGNETRON

H.V. CAPACITOR

2000V

H.V. TRANSFORMER

WIRING COLOR OR: ORANGE

3.3V

Page 26

POWER LEVEL

OUTPUT POWER

RELAY “1” TURN ON, OFF TIME

AGAINST FULL POWER

1 5/29 2 11/29 3 17/29 4 23/29 5 29/29

AUTO DEFROST CYCLE

When auto defrost is selected and the desired defrosting time is chosen, the automatic cycle divides the defrosting time into 5 periods of alternating defrost and stand times, by cycling on and off.

4. When the door is opened during cooking.

1) The primary interlock switch is opened to cut off primary voltage to the high voltage transformer to stop microwave oscillation.

2) The secondary interlock switch is opened to give the door open information to touch control circuit. The contacts of the RELAY “1” and “2” open, the display stops counting down.

3) Fan motor and turn table stop rotating.

4) The oven lamp turns off.

5) As soon as the door is opened, the interlock monitor switch contacts close and creats the short circuit.

6) If the contacts of primary interlock switch malfunction the 12A fuse blows open due to the large current surge caused by the short circuit activation, and this in turn stops magnetron oscillation (Fig. 1).

5. When the STOP/CLEAR button is touched during cooking.

1) The touch control circuit cuts the voltage supplied to the RELAY “1” coil and causes the magnetron to stop oscillating.

2) RELAY “2” turns off.

3) The display will show the time of day. If you don’t set the clock, the display will show a colon.

4) The oven lamp turns off.

5) Fan motor and turn table motor stop rotating.

OFF

11S

OFF

17S

OFF

23S

OFF

29S

Fig. 3

Page 27

-Cautions to be observed when trouble shooting. Unlike many other appliances, the microwave oven is a high-voltage, high-current equipment. It is

completely safety during normal operation. However, carelessness in servicing the oven can result in an electric shock or possible danger from a short circuit you are asked to observe the following precautions carefully.

(1) Always remove the power plug from the outlet before servicing. (2) Use an insulated screw driver which is attached to irom plate, and wear rubber gloves when servicing

the high voltage side.

(3) Discharge the high voltage capacitor before touching any oven components or wiring.

1. Check the earthed.

Do not operate on a 2-wire extension cord. The microwave oven is designed to be used with earthed. It is imperative, therefore, to makes sure it is earthed properly before begining repair work.

2. Warning about the electric charge in the

high voltage capacitor.

For about 30 seconds after the operation stopped, and electric charge remains in the high voltage capacitor. When replacing or checking parts, short between oven chassis and the negative high terminal of the high vol-tage capacitor, by using a properly insulated screw driver to discharge.

(4) When the 12Amp. fuse is blown out due to the operation of the monitor switch; replace primary,

secondary interlock switch and monitor switch. Refer to next page for the necessary adjustment.

(5) After repair or replacement of parts, make sure that the screws are properly tightened, and all

electrical connections are tightened.

(6) Do not operate without cabinet.

SAFETY PRECAUTIONS FOR DISASSEMBLY AND REP AIR

CAUTION: Service personnel should remove their watches whenever working close to or repairing

the magnetron.

CAUTION: When servicing the appliance, need a care of touching or replacing high potential parts

because of electrical shock or exposing microwave. These parts are as follows-H.V. Transformer, Magnetron, H.V. Capacitor, H.V. Diode.

Page 28

1. To remove cabinet.

Remove three screws on cabinet back.

2. To remove door assembly.

1) Remove two screws 1 which secure the stopper hinge top.

2) Remove the stopper hinge top

3 and door

assembly

3 from top plate of cavity.

3) Remove the stopper hinge top

3 from door

assembly.

4) Reverse the above for reassembly taking care to replace fixing glue.

3. To remove door parts.

DISASSEMBLY AND ASSEMBL Y

A01 A02 A03 A04 A05 A06 A07

A08

A09

A10

A11

NOTE: After replacing the door perform a

check of correct alignment with the hinge and cavity front face.

Page 29

(1) Remove the gasket door(A07) from door painting ass’y(A05). (2) Remove the door frame(A01) from door painting ass’y(A05). (3) Remove the barrier screen outer(A02) and the supporter barrier screen outer(A03). (4) Remove the hook spring(A09) and the hook(A08). (5) Remove the hinge stopper top ass’y(A04). (6) Remove two screws(A11) which secure the handle door(A10). (7) Rmove the handle door(A10) from the door frame(A01). (8) Reverse the above steps for reassembly.

4. Method to reduce the gap between the door seal and the oven front surface.

(1) To reduce gap located on part ‘A’.

1) Loosen two screws on the top hige stopper,

and then push the door to contact the door seal to oven front surface.

2) Tighten two screws.

(2) To reduce gap located on part ‘B’.

1) Loosen three screws on bottem hinge stopper,

and then the door to contact the door seal to oven front surface.

2) Tighten three screws.

(3) To reduce gap located on part ‘C’. (See Fig. A)

1) Loosen a screw on the interlock switch assembly located at the bottom of the oven body.

2) Draw the interlock switch assembly inward as possible to engage with hook on the door bottom.

3) Tighten a screw.

(4) To reduce gap located on part ‘D’.(See Fig. B)

1) Loosen a screw on the interlock switch assembly located at the top of the oven body.

2) Follow step (3) 2) and 3).

Secondary interlock switch

Mounting screw

Hook

Mounting screw

Hook

Primary interlock switch

Interlock monitor swtich

NOTE: A small gap may be acceptable if the microwave leakage does not exceed 4mW/cm

Fig. A Fig. B

B C

Stop Defrost

1 2 WeightQuantity Time

Lock Auto cook Watt g

Power Defrost+1min

Auto Cook

STOP

START

CLEAR

Speedy

Less

Clock

1. Beveroge

2. Soup

3. Casserole

4. Vegetable

5. Fish Fillets

Page 30

5. To remove control panel parts.

(1) Remove the screw which secure the control

panel, push up two snap fits and draw forward the control panel assembly.

(2) Pull out the knob volume (B07) form the control panel ass’y. (3) Remove eight screws (B05) which secure the PCB ass’y(B10). (4) Remove the PCB ass’y (B10) from the control panel (B02). (5) Remove the button cook (B04), the button auto cook (B09), the button start (B03) and the

button function (B08) from the control panel (B02).

(6) Remove the decorator panel (B01) from the control panel(B02). (7) Rmove the window display (B06) from the decorator panel(B01). (8) Reverse the above steps for reassembly.

NOTE: Do not attempt to remove switch membrane except for replacement.

B01 B02 B03 B04 B05

B06

B07

B08 B09 B10

Page 31

6. To remove high voltage capacitor.

(1) Remove a screws 1 which secure the

grounding ring terminal of the H.V. diode

and the capacitor holder 3.

(2) Remove the H.V. diode

2 from the capaci-

tor holder

(3) Remove the above steps for reassembly.

High voltage circuit wiring

7. To remove magnetron.

(1) Remove three screws 1 which secure the

magnetron

(2) Remove the magnetron

2 .

(3) Reverse the above steps for reassembly.

Magnetron

H.V. Capacitor

H.V. Diode

H.V. Transformer

Page 32

8. To remove fan motor assembly.

(1) Remove two screws 1 which secure the back cover 2 from the cavity outer. (2) Remove two screws

3 which secure the fan motor 4 from the back cover 2.

(3) Pull out the fan

5 from the fan motor 4.

(4) Reverse the above steps for reassembly.

9. To remove transformer.

(1) Remove the four screws 1 holding the H.V.

transformer

(2) Remove the transformer

(3) Reverse the above steps for reassembly.

Magnetron antenna

Metallic gasket plate

Cooling fin

Magnetron

Filament terminal

Wave guide Magnetron antenna

Metallic gasket plate

CAUTION: Never install the magnetron without the metallic gasket plate which is packed with

each magnetron to prevent microwave leakage. Whenever repair work is carried out on magnetron, check the microwave leakage. It shall not exceed 4mW/cm

for a fully assembled oven with door normally closed.

Page 33

Folling the procedure below to check if the oven is defective or not.

1. Check earthing before fault finding.

2. Be careful of the high voltage circuit.

3. Discharge the high voltage capacitor.

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

TROUBLE SHOOTING GUIDE

NOTE: When electric parts are checked or replaced, be sure the power cord is not inserted the wall

outlet. Check wire harness, wiring, and connection of the terminals, and power cord before check the parts listed below .

1. Incomplete segments. (A) Segments missing. (B) Partial segments missing. (C) Digit flickering other than normal

fluorescent slight flickering.

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

3. One or more digits in the display are not on when they should be.

4. Display indicates a number different from one setted. (For example, when 5:00 setted, 3:00 appears in the display.)

5. Specific numbers (for example 2 or 3) do not display when the dial knob is rotated.

6. Display does not count down or up with time cooking or clock operation.

7. Oven is programmable and cooks normally but no display shows.

8. Display obviously jumps in time while counting down.

9. Display counts down noticeably too fast while cooking.

10. Display can not shift from the first stage cooking

to the third stage cooking while 3 phase cooking (including defrost).

1 1. Display does not show the time of day when

clear button is pressed.

12. Oven lamp, fan motor and turn table motor do

not stop although cooking is finished. Check if the RELAY (RY2) contacts close if they are close, replace touch control circuit.

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

circuit.

Stop Defrost

1 2 WeightQuantity Time

Lock Auto cook Watt g

Page 34

(TROUBLE 2) Oven does not operte at all; any inputs can not be acceted

Condition

Check

CauseResult Remedy

Check continuity of interlock monitor switch with door closed. (COM NC)

Continuity

Malfunction of Interlock monitor switch

Replace

Fuse blows

No continuity

Check continuity of both Primary and secondary interlock switch with door closed

No Continuity

Malfunction of interlock switch

Check continuity of primary interlock switch contact with door partially open unit interlock monitor switch contact close (COM NC close)

Shorted contacts of primary interlock switch

Approx 90-120 Ω (normal)

Disconnect high voltage fuse and operate the unit

Fuse again bolows

NOTE 1

(COM NC)

Continuity

Replace

NOTE 1

Continuity

Replace

NOTE 1

Check continuity of primary winding of low voltage transformer.

0 Ω or infinite

Defective low voltage transformer

Replace

Defective high voltage transformer

Replace

Page 35

Condition

Check

CauseResult Remedy

Outlet has proper Voltage Fuse does not open

Check continuity both magnetron and heater thermostat

No Continuity

Defective magnetion and heater thermostat

Replace

Check continuity of noise filter board

No Continuity

Defective line filter borard

Replace

Check continuity of power supply cord.

No Continuity

Open power supply cord

Replace

Normal

Defective touch control circuit

Replace

Condition

Check

CauseResult Remedy

Turn table motor fan moter and oven lamp do not turn on

Check continuity of primary interlock switch

No Continuity

Malfunction of Primary interlock switch

Adjust or replace

Approx.

-24VDC

Faulty contacts of RELAY (RY2) open relay coil

Replace

Defective touch control circuit

Replace

Check D.C. voltage being supplied to RELAY (RY2) coil.

Check continuity of secondary interlock and D.O.M. switch

No Continuity

Malfunction of secondary interlock and D.O.M. switch

Adjust or replace

NOTE 1: All these switches must be replaced at the same time, please refer to page 17 and 18 for

adjustment instructions.

(TROUBLE 3) Display shows all figures selected, but oven does not start cooking, even though

desired program and time are set and start button is tapped.

Page 36

(TROUBLE 4) No microwave oscillation even though fan motor rotates.

Condition

Check

CauseResult Remedy

Replace

No microwave oscillation

Check continuity of high voltage fuse

No Continuity

Check continuity of high voltage capacitor terminals with wires removed

Continuity

Defective high voltage transformer

Continuity in backward direction

Defective high voltage rectifier

Replace

Defective high voltage transformer

No Continuity

Defective touch control circuit

Replace

Check continuity of high voltage recitifier in forward and backward direction with DC meggr

Check continuity of filament terminal of high voltage transformer

Check D.C. voltage being supplied to RELAY (RY1)coil

Replace

Connect megger leads to magnetron terminal and magnetron body

Continuity

Defective magnetron

Replace

Defective high voltage transformer

0 Ω or

Check resistance of primary and secondary coil of high voltage transformer

Replace

Defective magnetron

No Continuity

Check continuity of magnetron heater with wires removed

Approx.

-24V DC

Faulty contacts of RELAY(RY1) or open relay coil

Replace

Page 37

1. Type of encoding and key names

The tact switch keyboard consists of 9 keys whose aconfigurations are described above.

2. Key check procedure

To determine if the tact switch keyboard is defective or not, check the continuity of each button contacts with a multimeter.

1) CLOCK button: Between 7 and 10 6) MORE button: Between 7 and 11

2) STOP/CLEAR button: Between 8 and 10 7) ST ART button: Between 8 and 11

3) LESS button: Between 9 and 10 8) AUTO COOK button: Between 12 and 11

4) DEFROST button: Between 12 and 10 9) +1 min button: Between 14 and 11

5) POWER button: Between 14 and 10

NOTE : Before following the particular steps listed above in the trouble shooting guide for failure,

please check for the continuity of each wire-harness between the tact switch keyboard and PCB assembly.

KEYBOARD CHECK PROCEDURE

CLOCK

STOP CLEAR

LESS

DEFROST POWER

+1 min

AUTO COOK

STARTMORE

CN101

Check each button for continuity the tach switch deyboard as the following keyboard check procedure.

Display does not show program ming at all, even if button key is pressed

Normal

Malfunction of touch control circuity of control box main-assembly

Malfunction of touch control circuitry of control box sub-assembly

Replace control box main assembly

Replace control box sub-assembly

Condition

Check

CauseResult Remedy

Page 38

1. High voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle.

2. It is neither necessary nor advisable to attempt measurement of the high voltage.

3. Before touching any oven components or wiring, always unplug the oven from its power source and discharge the capacitor (see page 26).

COMPONENT TEST PROCEDURE

1. High voltage transformer

(A) Remove connections from the transformer

terminals and check continuity.

(B) Normal readings should be as follows:

Secondary winding.............................................

........................Approx 120Ω±10%(KOR-816T)

.......................Approx. 100Ω±10%(KOR-616T)

Filament winding.............................Approx. 0Ω

Primary winding...............................Approx. 0Ω

2. High voltage capacitor

(A) Check continuity of capacitor with meter on the

highest OHM scale.

(B) A normal capacitor will show continuity for a

short time, and then indicate 9MΩ once the capacitor is charged.

continuity.

(D) An open capacitor will show constant 9MΩ. (E) Resistance between each terminal and

chassis should be infinite.

3. High voltage diode

(A) Isolate the diode from the circuit by disconnec-

ting the leads.

(B) With the ohmmeter set on the highest

resistance scale, measure the resistance across the diode terminals. Reverse the meter leads and agin observe the resistance reading. Meter with 6V, 9V or higher voltage batteries should be used to check the front-back resistance of the diode, otherwise an infinite resistance may be read in both directions. Anormal diodes resistance will be infinite in one direction and several hundred KΩ inthe other direction.

4. Magnetron

For complete magnetron diagnosis, refer to “Measurement of the Microwave Output Power”. (Page 19) Continuity checks can only indicate and open filament or a shorted magnetron. To diagnose for an open filament or shorted magnetron.

(A) Isolate magnetron from the circuit by

disconecting the leads.

(B) A continuity check across magnetron filament

terminals should indicate ohm or less.

terminal and magnetron case should read open.

5. Interlock monitor switch

The interlock switch can be checked with an ohmmeter. Isolate the switch and then connect the meter leads to the common (COM) and normally close (NC) terminals of the switch. The meter should indicate an open circuit with the door closed and a closed circuit with the door opened.

6. Primary and secondary interlock switch

The primary and secondary interlock switch can be checked with an ohmmeter. Isolate the switch and connect the meter leads to the common (COM) and normally open (NO) terminals of the switch. The meter should indicate an open circuit with the door opened and a closed circuit with the door closed. In case improper operation is indicated, make the necessary switch adjustment or replacement.

Page 39

SAFETY INTERLOCK CONTINUITY TEST

• Disconnect the oven from the power supply.

• You can test continuity of safety interlocks and monitor switch by using switch tester or ohmmeter.

• The switch operation is checked by the lamp on/off of resistance zero/unlimited.

• The sequence of check is interlock monitor switch; primary and secondary interlock switches check.

• Make circuits like Fig. a, Fig. b, Fig. c for tests.

1) In case of interlock monitor check.

(Lamp on or zero resistance)

(ohmmeter)

– Fig. a –

Condition: 1) Door is opened.

2) Common terminal of the monitor switch disconnected.

3) In case of secondary interlock switch.

(ohmmeter)

– Fig. c –

Condition: 1) Door is closed.

2) In case of primary interlock check.

(Lamp on or zero resistance)

(ohmmeter)

– Fig. b –

Condition: 1) Door is closed.

* (Schematic diagram of S/W tester)

POWER SUPPLY CORD

PRIMARY INTERLOCK S/W

NO NO

COM COM

INTERLOCK MONITOR S/W

SECONDARY INTERLOCK S/W

POWER SUPPLY CORD

PRIMARY INTERLOCK S/W

COM

INTERLOCK MONITOR S/W

SECONDARY INTERLOCK S/W

CONTACT

LEAD

LAMP

S/W

BATTERY

Page 40

1. Circuit Check Procedure

1) Low voltage transformer (DMR-814FS) check. The low voltage transformer is located on the P.C.B. Measuring condition: Input voltage : 220V

Frequency : 60Hz

PRINTED WIRING BOARD

C D

NOTE 1: Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of

power source voltage.

NOTE 2: The acceptable tolerance of the secondary voltage is within ±5% of norminal voltage

NOTE : Each measure point must be measured with GND points.

2) Voltage check Key check point (MICOM PIN)

NO. CHECK POINT REMARK

1 PIN 21,24,32,33 OR 34 -5VDC 2 PIN 48 -27VDC

3 PIN 44

4 PIN 18 OR 19

5 DP1 PIN 1& 25 2.6 V AC (DISPLAY FILAMENT VOLTAGE)

NO. MEASURE POINT WA VEFORM REMARK

1 MP 1 -5V DC REPLACE Q4, EC2 2 MP 2 -16V DC REPLACE R6, EC3

MP 3 -24V DC REPLACE D12, D13, EC4

Voltage

LOAD NO LOAD

T erminal

C-D -19VDC -24VDC E-F - 2.1VDC - 2.2V AC

CHECK METHOD

T: 20ms (50 Hz)

T: 250ns

Page 41

2) Display prolems

NO. CAUSE MEASUREMENT RESUL T REMEDY

1 Poor contact between 1. Check the voltage of PIN 2.6 VAC Fix the Pin 1 &

P.C.B and display 1 & PIN 25. 25 on the filament. P.C.B.

2 The Display has some Refer to “The display Replace P.C.B.

troubles in its segment trouble shooting data” assembly .

3 Loss of vacuum in the White Replace P.C.B

display . spot is generated on assembly.

the display

TROUBLE DISPLAY NAME & PIN NO.

MICOM OUTPUT IN PIN NO.

TIME DEFROST, g do not come on GRID 1 (G1), 21 10 WEIGHT DEFROST, WATT do not come on. GRID 2 (G2), 17 6

QUANTITY does not come on GRID 3 (G3), 14 3 ST AGE 2,AUT O COOK do not come on. GRID 4 (G4), 20 2 ST AGE 1, LOCK do not come on. GRID 5 (G5), 4,7 1 SEGMENT, “a” does not come on from G1 to G5. SEGMENT d, 19 8 SEGMENT, “b” does not come on from G1 to G5. SEGMENT e, 18 7 SEGMENT, “c” does not come on from G1 to G5. SEGMENT f, 16 5

SEGMENT, “d” does not come on from G1 to G5. SEGMENT a, 23 12 SEGMENT, “e” does not come on from G1 to G5. SEGMENT b, 22 11 SEGMENT, “f” does not come on from G1 to G5. SEGMENT c, 20 9 SEGMENT, “g” does not come on from G1 to G5. SEGMENT g, 15 4 DEFROST, QUANTITY, ST AGE2, STAGE1 do not come on

UPPER BAR l,5 63

LOCK, AUTO COOK, WATT, g do not come on LOWER BAR h,i,j,k,6,8,9,1 1 62

Stop Defrost

1 2 WeightQuantity Time

Lock Auto cook Watt g

Display trouble shooting data

4) When there is not microwave oscillation. (1) When pressing “ ST ART ”button, oven lamp does not turn on.

Fan motor and turntable motor do not rotate, but cook indicator in display comes on. * Cause : RELA Y “2”does not operate.

Q12

MICOM

RY2

-24V

Page 42

FIG. 5 MEASUREMENT POINT

MP2

MP3

MP1

Page 43

FIG. 5 MEASUREMENT POINT

Page 44

CHECK METHOD

POINT

A B

ST AGE

RELA Y “2” ON – 5VDC GND RELA Y “2” OFF GND –24VDC

POINT

A B

ST AGE

RELA Y “2” ON – 5VDC GND RELA Y “2” OFF GND –24VDC

POINT

A B

ST AGE

1) DOOR OPENED OPEN -5VDC

2) DOOR CLOSED CLOSED GND

CHECK NO. METHOD REMEDY

Check the state (ON,OFF) of the secondary Replace secondary interlock switch by resistance measurement. interlock switch

MICOM

-5V

R11

SWD.O.M

CHECK METHOD

5) When the door is opened during operation, the count down timer does not stop.

(2) When pressing “ ST ART ”button, oven lamp does not turn on.

Fan motor and turntable motor rotate and cook indicator in display comes on. * Cause : RELA Y “1”does not operate.

RY1

-24V

Q11

MICOM

Page 45

6) When the digital clock does not operate properly .

D10

R26 R24

R27

A B

-5V

MICOM

D12

D11

D13

D14

R21

R23

POINT WAVEFORM

C T: 20 ms(50Hz)

If clock does not keep exact time, you must check Diode D10, transistor Q8.

-5V

Page 46

1) PCB Circuit Diagram

2. P. C. B CIRCUIT DIAGRAM

Page 47

2) Transistor(NPN Type)

3) Diode and zener diode

Emitter

Collecftor

Base

DIODE

ZENER DIODE

Cathode (k)

ANODE(A) D1-16

ANODE(A) ZD1-6

Page 48

3. PRINTED CIRCUITS BOARD

Page 49

Page 50

1) PCB P AR T LIST

4. P.C.B LOCATION NO.

NO PART NAME SYMBOL SPECIFICATION PARTCODE Q’TY

1 PCB MAIN M156 M156 3514313851 1 2 R CARBON FILEM R6, R9, R10, R12, R17 1/4W 1KΩJ RD-4Z102J- 5 3 R CARBON FILEM R13 1/4W 100ΩJ RD-4Z101J- 1 4 R CARBON FILEM R27 1/4W 2KΩJ RD-4Z202J- 1 5 R CARBON FILEM R8, R21, R23, R24, R26 1/4W 4.7ΩJ RD-4Z472J- 5 6 R CARBON FILEM R7 1/4W 100KΩJ RD-4Z104J- 1 7 R CARBON FILEM R22 1/6W 1MΩJ RD-4Z202J- 1 8 R CARBON FILEM R5 1/6W 1MΩJ RD-AZ105J- 1

9 R CARBON FILEM R1, R2 1/6W 1KΩJ RD-AZ101J- 2 10 R CARBON FILEM R3 1/6W 1KΩJ RD-AZ103J- 1 11 R CARBON FILEM R4 1/6W 10KΩJ RD-AZ103J- 1 12 R CARBON FILEM R11 1/6W 20KΩJ RD-AZ203J- 1 13 R CARBON FILEM R19, R20 1/2W 6.8KΩJ RD-2Z689JS 2 14 R CARBON FILEM R16, R18, R25 1/2W 470KΩJ RD-2Z471JS 3 16 R CARBON FILEM R14 1/2W 100ΩJ RD-2Z101JS 1 17 C CERAMIC C1~C5, C7~C9 50V 0.1uF Z CCKF1H473Z 8 18 C CERAMIC C6 50V 0.047uF Z CCKF1H104Z 1 19 C ARRRAY CA1 50V 1000PF(5P) CN4XB-102M 1 20 DIODE ZENER D1~D5, D10 1N4148 DZN4148- 6 21 DIODE RECTIFIER D8, D9, D11~D14 1N4002A DZN4002A- 6 22 DIODE SWITCHING D6 1N4148M DZN4148M- 1 23 DIODE ZENER ZD1, ZD5 MTZ3.9B DZTZ3R9B- 2 24 DIODE ZENER ZD2 MTZ5.6B DZTZ5R6B- 1 25 DIODE ZENER ZD3, ZD4 MTZ24B DZTZ5R6B- 2 26 TR DIGITAL Q1, Q2, Q5 DTA114ES TDTA114ES- 3 27 TR DIGITAL Q6, Q11, Q12 KTRA106M TZRA106M- 3 28 TRANSISTOR Q3, Q4, Q8 KTA1270Y TZTA1270Y- 3 29 TRANSISTOR Q7 KTA1273Y TZTA1273Y- 1 30 C ELECTRO EC2, EC4 RS 50V 10uF CEXE1H100A 2 31 C ELECTRO EC1 RS 250V 100uF CEXE1E101A 1 32 C ELECTRO EC3, EC6 RSS 50V 220uF CEXF1H221V 2 33 C ELECTRO EC5 RSS 50V 1000uF CEXF1H102V 1 34 CONNECTOR CN1 YW396-02V 3519150520 1 35 CONNECTOR CN2 HLEM15S-1 4CW215SBD0 1 36 CONNECTOR CN3 YW396-05AV 3519150510 1 37 WIRE FLAT 1.25X15X90XC WSJ-159007 1 38 IC MICOM IC1 TMP47C862AN-GC17 13GSR816T- 1 39 RESONATOR CR1 KBR-40MKSTF 5PKBR40MKS 1 40 BUZZER BZ1 MB-20K 3515600100 1

✔ Caution:

In this Service Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service information Center(http://svc.dwe.co.kr)

Page 51

2) SUB PCB P AR T LIST

NO PART NAME SYMBOL SPECIFICATION PARTCODE Q’TY

41 SW RELAY RY1 G5J-1TP-M 24V 5SC0101107 1 42 SW RELAY RY2 G5B-1 24V 5SC0101107 1 43 TRANS POWER LVT1 DMR-814FS 5EP035301 1 44 DIGITRON DP1 SVM-05SS13 DSVM5SS13- 1 45 HOLDER VFD PP(BALCK) 351302600 1 46 JUMPER WIRE J3~J7, J13~J17, J20~J25 1/0.52 TING COATING 85801052GY(10MM) 16 47 JUMPER WIRE J1, J2, J10, J11, J12 1/0.52 TIN COATING 85801052GY(5MM) 5

NO PART NAME SYMBOL SPECIFICATION PARTCODE Q’TY

1 PCB SUB M157 M157 3514313861 1 2 LED L102 SLR-34VR DSLR34VR- 1 3 SWITCH TACT SW101~SW109 KPT-1115AM 5S50101Z93 9 4 SWITCH TACT CN101 HLEM15R-1 4CW215RBD0 1 5 LED L101 DLY-5013T DLY-5013T- 1 6 SW ROTARY EN101 SDB161PVB17F- 5S10109002 1

1-2-36-36PC(PITCH5) 7 R CARBON R101~103 1/4W KΩJ RD-4Z102J- 3 8 C CERAMIC C101~104 50V 100PF Z CCZF1H102Z 4 9 COVER LED PP(NATURAL) 3511404600 2

✔ Caution:

Page 52

1. Door Assembly

EXPLODED AND PARTS LIST

A01 A02 A03 A04 A05 A06 A07

A08

A09

A10

A11

REF NO. PART NAME PART CODE DESCRIPTION Q’TY REMARK

A01 FRAME DOOR

3512202220

ABS

KOR-816T

3512202020 KOR-616T

A02 BARRIER-SCREEN

3517003140

ACRYLE 1.5T

KOR-816T

3517003040 KOR-616T

A03

SUPPORTER BARR-S * O

3515304400

ABS

KOR-816T

3515304600 KOR-616T

A04 STOPPER HINGE

T AS 3515201500 KOR-61150S 1

A05 DOOR PAINTING AS

3511706520 KOR-81250S

KOR-816T

3511706100 KOR-61150S KOR-616T

A06 BARRIER-SCREEN

3517002900

PE 0.1T

KOR-816T

3517002800 KOR-616T

A07 GASKET DOOR

3512300400

KOR-816T

3512300200 KOR-616T A08 HOOK 3513100710 POM 1 A09 SPRING HOOK 3515101310 HSW-3 1

A10 HANDLE DOOR

3512601200

ABS

KOR-816T

3512601300 KOR-616T A11 SCREW TAPPING 7122401211 T2S TRS 4X12 MFZN 2

DOOR AS : 3511708710 (KOR-816T)

3511707920 (KOR-616T)

✔ Caution:

Page 53

2. Control Panel Ass’Y

B01 B02 B03 B04 B05

B06

B07

B08 B09 B10

REF NO. PART NAME PART CODE DESCRIPTION Q’TY REMARK

B01 DECORATOR C-PANEL

3511602100

ABS 1

KOR-816T

3511602300 KOR-616T

B02 C-PANEL

3516710930

ABS 1

KOR-816T

3516905800 KOR-616T B03 BUTTON START 3515101600 ABS 1 MILKY B04

BUTTON FUNCTION(COOK)

3516905700 ABS 1 B05 SCREW TAPPING 7621301011 T2S PAN 3X10 PW MFZN 9

B06 WINDOW DISPLAY

3515500910

PMMA 1

KOR-816T

3515500810 KOR-616T B07 KNOB VOLUME 3516905600 ABS 1 B08 BUTTON FUNCTION 3516905600 ABS 1 B09

BUTTON FUNCTION(AUTO)

3516905900 ABS 1

B10 PCB AS

PKMPMSWJ00 KOR-816T0A

PKMPMSUM00 KOR-616T0A

C-PANEL AS : PKCPSWVH00 (KOR-816T)

PKCPSWUL00 (KOR-616T)

✔ Caution:

Page 54

3. Main Unit

Page 55

REF NO PART NAME PART CODE DESCRIPTION Q'TY REMARK

A00 DOOR AS EXPLODED AND PART LIST 1 KOR-816T B00 CONTROL-PANEL AS EXPLODED AND PART LIST 1 KOR-816T F01 COVER WAVE GUIDE 351403200 PP 1

F02 CAVITY AS

3516105600 KOR-81150S 1 KOR-816T

3516104800 KOR-61150S 1 KOR-616T F03 COUPLER 3517400600 PPS 1 F04 GUIDE ROLLER AS 3512510600 KOR-61150S 1

F05 TRAY

3517203500

GLASS 1

KOR-816T

3517203600 KOR-616T F06 CABINET

3510801400

PCM T0.6 1

KOR-816T

3510801300 KOR-616T F07 SCREW TAPPING 7112401011 T1 TRS 4X10 MFZN 3 F08 SCREW SPECIAL 3516003700 TT3 FLG HEX 4X8 MFZN 2 F09 SCREW TAPPING 7122401211 T2S TRS 4X12 MFZN 1 F10 CLAMP POWER CORD 4413A90012 NYLON 66 1 F11 SCREW TAPPING 7112401011 T1 TRS 4X10 MFZN 1 F12 CORD POWER AS 35113AAQ95 3X0.75 60X60 120-TRML 1 F13 MAGNETRON 3518002200 2M218H (MF) I 1 F14 SCREW SPECIAL 3516002700 T2S FLG 4X13 SE MFZN 3 F15 SCREW TAPPING 7112401011 T1 TRS 4X10 MFZN 2 F16 SCREW MATCHINE 7601400811 PAN 4X8 PW MFZN 2 F17 COVER *B 3511402500 SBGH T0.8 1 F18 MOTOR SHADED POLE 3963512100 MW10GA-R01 1 F19 FAN 3511800300 PP+30% GLASS 1 F20 SCREW TAPTITE 7272400811 TT3 TRS 4X8 MFZN 1 F21 HOLDER HV CAPACITOR 3513001900 SECC T0.8 1

F22 CAPACITOR HV

4415T66300 2100VAC 0.98µF

KOR-816T

441U667020 2100VAC 0.95µF KOR-616T F23 DIODE H.V. 4416V24000 HVR-1X-32B 1

F24 TRANS H.V.

3518106520 DW-N90S0-81T

KOR-816T

3518106210 JY-N80S0-61T KOR-616T F25 SCREW SPECIAL 3516003700 TT3 FLG HEX 4X8 MFZN 4 F26 SCREW TAPPING 7112401011 T1 TRS 4X10 MFZN 5

F27 BASE

3510308900

SBHG T0.8 1

KOR-816T

3510308700 KOR-616T F28 FOOT 3512100900 PP DASF-130 2 F29 SCREW TAPTITE 7272400811 TT3 TRS 4X8 MFZN 1 F30 STOPPER HINGE *U 3515201101 SCP-1 T2.5 1 F31 SCREW TAPPING 7122401211 T2S TRS 4X12 MFZN 2 F32 SWITCH MICRO 4415A17352 VP-533A-OF 1 F33 SWITCH MICRO 4415A66910 VP-531A-OF 1 F34 SWITCH MICRO 4415A17352 VP-533A-OF 1 F35 LEVER LOCK 3513701300 POM 1 F36 LOCK 3513805710 POM 1 F37 LAMP 3513601600 BL 240V 25W T25 1 F38 NOISE-FILTER 3518603500 DWLF-1 1 F39 SCREW TAPPING 7121400611 T2S TRS 4X6 MFZN 2 F40 MOTOR SYNCRO 3966310100 GM-16-24FD12 1 F41 FUSE H.V. 3518700900 HV-41A 5KV 0.55A #250 1 F42 SLOW ACTING RELAY 3518570400 DWSR-1 1 F43 SCREW TAPPING 7122401211 T2S TRS 4X12 MFZN 1

✔ Caution:

Page 56

S/M NO. : R616T2S001

DAEWOO ELECTRONICS CO., L TD.

686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX: DWELEC K28177-8 CABLE: “DAEWOOELEC” FAX: 02) 360-8184 TEL: 02) 360-8183

http://www.dwe. daewoo.co.kr

PRINTED DATE: SEP. 1998

Daewoo KOR-816T2S Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual