Daewoo KOG-366T0S Service Manual

S/M NO. :

DAEW OO ELECTRONICS CO., LTD.

686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX: DWELEC K28177-8 CABLE: “DAEWOOELEC” FAX: 02) 590-6291 TEL: 02) 360-7114/590-6151~5

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

PRINTED DATE: JUNE 1998

Service Manual

Microwave Oven

Model :KOG-366T0S

DAEWOO ELECTR ONICS CO., LTD. O VERSEAS SER VICE DEPT.

PRECA UTIONS T O BE OBSERVED BEFORE AND DURING SER VICING T O AVOID POSSIBLE EXPOSURE T O EXCESSIVE MICROW AVE ENERGY

(a) Do not operate or allow the oven to be operated with the door opened. (b) Make the following safety checks on all ovens to be serviced before activating the magnetron or

other microwave source, and make repairs if 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, and (5) evidence of dropping or abuse.

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.

TABLE OF CONTENTS

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

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

FEATURES DIAGRAM ................................................................................................................................................4

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

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

OPERATION PROCEDURE........................................................................................................................................6

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

INTERLOCK MECHINISM FUNCTIONS AND ADJUSTMENTS..............................................................................17

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

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

CIRCUIT DESCRIPTION...........................................................................................................................................23

SAFTY PRECAUTIONS FOR DISASSEMBLY AND REPAIR .................................................................................26

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

TROUBLE SHOOTING GUIDE .................................................................................................................................33

KEYBOARD CHECK PROCEDURE.........................................................................................................................38

COMPONENT TEST PROCEDURE.........................................................................................................................39

SAFETY INTERLOCK CONTINUITY TEST..............................................................................................................40

PRINTED WIRING BOARD.......................................................................................................................................41

CIRCUIT CHECK PROCEDURE...............................................................................................................................41

P.C.B. CIRCUIT DIAGRAM........................................................................................................................................45

COMPONENT INFORMATION .................................................................................................................................46

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

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

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

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.

CAUTION

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 MIPROPERLY USED OR CONNECTED. ALL INPUT AND OUTPUT MICROWAVE CONNECTIONS. WAVEGUIDE, FLANGES AND GASKETS MUST BE SECURE. NEVER OPERATE THE DEVICE WITHOUT A MICROWAVE ENERGY ABSORNING LOAD ATTACHED. NEVER LOOK INTO AN OPEN WAVEGUIDE OR ANTENNA WHILE THE DEVICE IS ENERGIZED.

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 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 off 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 serivicing, a microwave emission check should be performed prior to servicing the oven.

(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 it until the oven has been brought into compliance.

3) If the oven operates with the door opened, the service person should tell the user not to operate the oven and contact the manufacturer and CDRH immediately.

PROPER USE SERVICE PRECAUTIONS

ITEM SPECIFICATION

POWER SUPPLY 230V~50Hz, SINGLE PHASE WITH EARTHING

MICROWAVE 1200 W

POWER

GRILL 1050 W

CONSUMPTION

COMBINATION 2200 W MICROWAVE ENERGY OUTPUT 800 W(IEC 705) MICROWAVE FREQUENCY 2450 MHz OUTSIDE DIMENSIONS (W X H X D) 465 X 274 X 379 mm CAVITY DIMENSIONS (W X H X D) 290X 200 X 290 mm NET WEIGHT 14.5 Kg TIMER 60 min FUNCTION SELECTIONS MICROWAVE/GRILL/COMBINATION MICROWAVE POWER LEVELS 5 LEVELS

* Specifications subject to change without notice.

SPECIFICATIONS

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.

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

Oven cavity.

Spatter shield - Protects the microwave outlet from splashed of cooking foods.

Safety interlock system.

Door viewing screen - Allows viewing of food. The screen is designed so that light can pass through, but not the microwaves.

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

Roller guide - This must always be used for cooking together with the glass cooking tray.

Display - Cooking time, power level, present time are displayed.

00qqww

Function buttons - Used to select desired oven operation. : MICROWAVE, AUTOCOOK, DEFROST.

Grill / Combi button - Used to set the Grill or Combi mode.

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 incressed 30 seconds)

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

clock.

yy uu

More/Less button - Used to select auto cook time. (More/less 10% of auto cook time)

Clock button - Used to set and recall the time of day.

Dial knob - Used to set the cooking time, weight and quantity.

Guide lamp - When blinking it informs you to be ready to operate dial knob.

Reflector (Insulator Heater)

Heating Element

Metal Rack

FEATURES DIAGRAM

CAUTION : Improper use of the earthing pulg can result in a risk of electric shock. consult an qualified

electrician or serviceman if the earthing instructions are not completely understood, or if doubt extension 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 3-slot 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.

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. osition 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 required a current of approximately 12 ampere. 230V 50Hz.

• Power supply cord is about 1.1 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 damage resulting from use of this oven with a voltage of a 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:

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

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

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

EARTHING INSTRUCTIONS

INSTALLATION

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 appliances 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.

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.

Touch Power pad,

Power Level(Display)

Approximate Percentage

Once the Touch of Power

5 800W 100% 4 650W 80% 3 450W 60% 2 300W 40% 1 140W 20%

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

OPERATION PROCEDURE

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.

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 tol 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 is closed securely. The oven will not start cooking until the door is completely closed or the program has been reset.

This example is 24 hour clock system.

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.

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

NOTE : This oven is multiple

clock system.

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.

CONTROLS

CLOCK

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 before 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.

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.

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

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

4. Press CLOCK button.

SETTING THE CONTROL

The display will show present time, and the colon strats blinking. This digital clock allows you to set to “10:10”.

1. Press DEFROST button twice. This TIME DEFROST indicator light will light up.

2. Turn the DIAL KNOB for the

desired defrosting time.

For example : 20 minutes.

20:00 will show in the display.

TIME DEFROST

NOTE : Time can be set up to

60 minutes.

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

3. Press button.

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.

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

in TIME DEFROST mode.

SETTING THE CONTROL

1. Press DEFROST button once. The WEIGHT DEFROST indicator light will come on. The g indicator light will start blinking.

2. Turn the DIAL KNOB for the

desired defrosting weight. For example : 1000g

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

3. Press

button.

The WEIGHT DEFROST indicator light will start blinking to show the

oven is in WEIGHT DEFROST mode.

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

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.

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.

WEIGHT DEFROST

SETTING THE CONTROL

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

For example : 800WATT

The M/W indicator light will light. The WATT indicator light start blinking.

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

For example : 10minutes.

10:00 will show in the display.

3. Press button.

The M/W indicator light will starts blinking to show the oven is in

MICROWAVE mode.

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.

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 800W, 650W, 450W, 300W and 140W.

• It is displayed after and 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.

MICROWAVE

NOTE : Time can be set up to

60 minutes.

SETTING THE CONTROL

1. Press GRILL button once.

The GRILL indicator light will light.

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

For example : 25 minutes.

25:00 will show in the display.

3. Press

button.

The GRILL indicator light will start blinking.

NOTE : • The heating element is located in the top of the oven.

• There is no pre-heating the oven for grilling. Place food inside the oven when setting the controls.

• The GRILL button is used with COMBI function.

• Whenever this button is pressed, display is changed to GRILL/COMBI mode.

• The setting time is increased if you are to turn right the DIAL KNOB.

• The setting time is decreased if you are to turn left the DIAL KNOB.

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

GRILL COOK

NOTE : Time can be set up to

30 minutes.

NOTE :

SETTING THE CONTROL

1. Press COMBI button once again. The corresponding COMBI indicators will light on the display.

2. Turn the DIAL KNOB for the

desired cooking time.

For example : 10 minutes.

10:00 will show in the display.

3. Press

button.

The COMBI indicator light will start blinking.

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.

NOTE : • Microwave and Grill operate simultaneously (or sequentially) in this mode.

• Whenever you press COMBI button, display is changed “0”, “: H”, “: L”,

• Therefore you can select power level of MICROWAVE.

COMBI COOK

NOTE : Time can be set up to

30 minutes.

DISPLAY POWER LEVEL

: 0 Approx. 450W

: H Approx. 550W

: L Approx. 350W

SETTING THE CONTROL

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 : Remove 10% for programmed time.

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

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.

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

4. Turn the DIAL KNOB for desired

cooking quantity.

“3” will show in the display.

5. Select the desired cooking quantity.

For example : 3(350g)

NOTE : • There is programmed for cooking of five kinds(1~5).

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

AUTO COOK

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.

The oven will now start auto cook for menu2.

The indicator light starts blinking.

7. Press button.This example don’t set MORE or LESS function.

NOTE : •AUTO COOK menu and quantity.

MENU QUANTITY NO

1 1CUP

1 BEVERAGE 2 2CUPS

3 3CUPS 1 250g

2 SOUP 2 300g

3 350g 4 400g 1 200g

3 CASSEROLE 2 400g

3 600g 4 800g 1 250g

4 VEGETABLE 2 300g

3 350g 4 400g 1 300g 2 400g

5 FISH FILLET 3 500g

4 600g 5 700g

SETTING THE CONTROL

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.

• The safety 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.

SPEEDY COOK

CHILD SAFETY LOCK

STAGE COMBINATIONS

This oven has the ability to be programmed to do up to three consecutive functions. These combinations are given 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 of setted functions are lighted, and indicator of operating function is blinking.

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

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

+ 39 hidden pages