Daewoo KOR-616T2S Service Manual

Service Manual

Microwave Oven

Model: KOR-616T2S

KOR-816T2S

DAEWOO ELECTRONICS CO., LTD.

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

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.

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

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.

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

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%

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.

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.

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.

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.

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.

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.

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.

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

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)

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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