Daewoo KOG-180A0S, KOR-168H9W Service Manual

S/M No. : G131A0S001

Service Manual

Microwave Oven

Model: KOG-180A0S

DAEWOO ELECTRONICS CO., LTD.

S/M No. : G180A0S001

http : //svc.dwe.co .kr Feb. 2002

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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).

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 open. (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 (5) Evidence of dropping or abuse.

(c)Before turning on power to the microwave oven for any service test or inspection within the microwave

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

(d) Any defective or misadjusted components in the interlock, monitor, door seal and microwave

generation and transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual before the oven is released to the owner.

(e) A microwave leakage check to verify compliance with the Federal performance standard should be

performed on each oven prior to release to the owner.

TABLE OF CONTENTS

SAFETY AND PRECAUTIONS........................................................................................................................................3

FOR SAFE OPERATION...........................................................................................................................................3

FOR SAFE SERVICE PROCEDURES .....................................................................................................................3

SPECIFICATIONS ............................................................................................................................................................4

EXTERNAL VIEW.............................................................................................................................................................5

OUTER DIMENSION.................................................................................................................................................5

FEATURE DIAGRAM.................................................................................................................................................6

CONTROL PANEL.....................................................................................................................................................7

INSTALLATION ................................................................................................................................................................8

OPERATIONS AND FUNCTIONS ...................................................................................................................................9

DISASSEMBLY AND ASSMBLY...................................................................................................................................10

INTERLOCK MECHANISM AND ADJUSTMENT.........................................................................................................18

TROUBLE SHOOTING GUIDE......................................................................................................................................19

MESUREMENT AND TEST............................................................................................................................................23

MEASUREMENT OF THE MICROWAVE POWER OUTPUT................................................................................23

MICROWAVE RADIATION TEST ...........................................................................................................................24

COMPONENT TEST PROCEDURE.......................................................................................................................25

WIRING DIAGRAM.........................................................................................................................................................26

PRINTED CIRCUIT BOARD...........................................................................................................................................27

CIRCUIT CHECK PROCEDURE.............................................................................................................................27

PCB CIRCUIT DIAGRAM ........................................................................................................................................30

P.C.B. LOCATION NO.............................................................................................................................................31

EXPLODED VIEW AND PARTS LIST...........................................................................................................................32

DOOR ASSEMBLY..................................................................................................................................................32

CONTROL PANEL ASSEMBLY..............................................................................................................................32

TOTAL ASSEMBLY.................................................................................................................................................32

SAFETY AND PRECAUTIONS

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.

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 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 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.

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

SPECIFICATIONS

MODEL KOG-180A0S POWER SUPPLY 230V~50HZ, SINGLE PHASE WITH EARTHING

MICROWAVE 1400W

POWER

GRILL 1150W

CONSUMPTION

COMBINATION 2500W MICROWAVE ENERGY OUTPUT 1000W MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 589X339X488mm CAVITY DIMENSIONS (W X H X D) 399X278X452.1mm NET WEIGHT APPROX. 19.5kg TIMER 99min. 90sec. FUNCTION SELECTIONS MICROWAVE, GRILL, COMBINATION POWER SELECTIONS 10 LEVELS CAVITY VOLUME 1.8 Cu. Ft

* Specifications are subject to change without notice.

EXTERNAL VIEW

589

339

488

1. OUTER DIMENSION

1we456

1. DOOR SEAL

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

2. DOOR HOOK

When door is closed, it will automatically lock shut. If door is opened while oven is operating, magnetron tube will immediately stop operating.

3. DOOR SCREEN

Allows viewing of food. Microwave cannot pass through perforations in screen.

4. SPATTER SHIELD

Protects the microwave outlet from splashes of cooking foods.

5. OVEN LAMP

Automatically turns on during oven operating.

6. SAFETY INTERLOCK SYSTEM

7. CONTROL PANEL

8. GLASS COOKING TRAY

Made of special heat resisant glass. The tray must always be in proper position before operating. Do not cook food directly on the tray.

9. OVEN FRONT PLATE

10. DOOR OPENING BUTTON

To open the door, push the door opening button. When door is closed, it will automatically lock shut. If door is opened while oven is operating, magnetron tube will immediately stop operating.

11. ROLLER GUIDE

Supports the glass cooking tray.

12. REFLECTOR (INSULATOR HEATER)

13. HEATING ELEMENT

14. METAL RACK

2. FEATURE DIAGRAM

COMBI GRILL Defrost

Power

Kitchen

Timer

Clock

Fish Poultry Meat

1hour

10min

10min.

1min

1min.

10sec

1. Bread

2. Soup

3. Baked Potato

4. Fresh Vegetable

5. Frozen Vegetable

KOG-180A

Dish Warmer Frozen Pizza

Beverage

Pasta

AUTO COOK

M/W Def. Grill Combi Timer/g

r t

9 q

Stop/Clear

Start/Speedy Cook

One Touch

Auto Defrost

LESS

1. TIME SET PAD - Used to set the cooking time and the present time.

2. DISPLAY - Cooking time, power level, indicators and present time are displayed.

3. ONE TOUCH - Used to cook or reheat specific quantities of food.

4. AUTO COOK - Used to cook or reheat.

5. MORE - Used to increase time to cooking.

6. LESS - Used to decrease time from cooking.

7. AUTO DEFROST - Used to defrost foods.(for weight)

8. POWER - Used to set power level.

9. DEFROST - Used to defrost foods.(for time)

10. KITCHEN TIMER - Used as a minute timer, delay cooking, hold setting after cooking.

11. CLOCK - Used to set clock.

12. STOP/CLEAR - Used to stop the oven operation or to delete the cooking data.

13. START/SPEEDY COOK - Used to start the oven and also used to set a reheat time.

14. COMBI - Used to cook combi

15. GRILL - Used to cook grill

3. CONTROL PANEL

- KOG-180A0S

INSTALLATION

1. Steady, flat location

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

2. 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, cause oven failure. Position the oven as far from them as passible.

3. Away from Radio and TV sets

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

4. 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.

5. Power supply

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Check your local power source. This microwave oven requires a current of approximately 12 amperes, 230Volts, 50Hz grounded outlet.

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Power supply cord is about 0.8 meters long.

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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 ampere fuse other than those specified.

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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.

6. Examine the oven after unpacking for any damage such as:

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

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

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

This appliance must be earthed. In the event of an electrical short circuit, earthing reduces the risk of the 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.

W ARNING

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, and either:If it is 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, or Do not use an extension cord.

EARTHING INSTRUCTIONS

OPERATIONS AND FUNCTIONS

1. Connect the main lead to an electrical 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. Close the door securely.

4. When the oven door is opened, the light turns on.

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.

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

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

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

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

10. 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.

11. If the START pad is touched and the oven does not operate, check area between the door and door is closed

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

12. When using the GRILL or COMBI mode ;

• Do not open the door so often, the temperature inside the oven decrease and the cooking may not be completed in setting time.

• Never touch the oven window and metal interior of the oven when taking food in and out, because the temperature inside the oven and door is very high.

• When using these modes, be careful as the tray will be hot to touch, use oven gloves or pot holders while handing tray.

Wattage output chart

The power level is set by pressing the POWER pad. The chart shows the display, the power level and the percentage of power.

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

Touch POWER pad. Power level(Display) Approximate Percentage of Power

Once P-HI 100%

Twice P-90 90% 3 times P-80 80% 4 times P-70 70% 5 times P-60 60% 6 times P-50 50% 7 times P-40 40% 8 times P-30 30% 9 times P-20 20%

10 times P-10 10% 11 times P-00 0%

DISASSEMBLY AND ASSEMBLY

- Cautions to be observed when trouble shooting.

Unlike many other appliances, the microwave oven is high-voltage, high-current equipment. It is completely safe 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 screwdriver 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 grounding.

Do not operate on a two-wire extension cord. The microwave oven is designed to be used while grounded. It is imperative, therefore, to make sure it is grounded properly before beginning repair work.

(2) Warning about the electric charge in the high voltage capacitor.

For about 30 seconds after the operation has stopped, 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 voltage capacitor by using a properly insulated screwdriver to discharge.

4. When the 15A fuse is blown due to the operation of the monitor

switch; replace primary interlock switch, secondary interlock switch and interlock monitor switch.

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.

CAUTION : Service personnel should remove their watches whenever working close to or replacing the magnetron.

WARNING :When servicing the appliance, take care when touching or replacing high potential parts because of

electrical shock or exposing microwave. These parts are as follows - HV Transformer, Magnetron, HV Capacitor, HV Diode, HV Fuse.

1. To remo ve cabinet

1) Remove three screws on cabinet back.

2) Push the cabinet backward.

2. To remo ve door assemb l y

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

2) Remove the door assembly from top plate of cavity.

3) Reverse the above for reassembly.

NOTE : After replacing the door assembly, perform a check of correct alignment with the hinge and cavity front plate.

+ 24 hidden pages

Daewoo KOG-180A0S, KOR-168H9W Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual