Daewoo KOG-6C675S, KOG-6C67 Service Manual

S/M No. : G6C675S001

Service Manual

Microwave Oven

Model: KOG-6C675S

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).

DAEWOO ELECTRONICS CORP.

http : //svc.dwe.co.kr

Jan. 2004

PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY

(a)Do not operate or allow the oven to be operated with the door open.

(b)Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make repairs as necessary: (1) Interlock operation, (2) Proper door closing, (3) Seal and sealing surfaces (arcing, wear, and other damage), (4) Damage to or loosening of hinges and latches, (5) Evidence of dropping or abuse.

(c)Before turning on 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								...........................................................................................................................................
																	2
1. FOR SAFE OPERATION								..................................................................................................................................									2
2. FOR SAFE SERVICE PROCEDURES														.............................................................................................................
																	2
SPECIFICATIONS			...............................................................................................................................................................
																	3
EXTERNAL VIEW		................................................................................................................................................................
																	4
1. OUTER DIMENSION						.......................................................................................................................................											4
2. FEATURE DIAGRAM						........................................................................................................................................											5
INSTALLATION	...................................................................................................................................................................
																	6
OPERATIONS AND FUNCTIONS									.......................................................................................................................................
																	7
DISASSEMBLY AND ASSEMBLY										......................................................................................................................................
																	8
INTERLOCK MECHANISM AND ADJUSTMENT															.............................................................................................................
																	17
TROUBLESHOOTING GUIDE								.........................................................................................................................................
																	18
MEASUREMENT AND TEST							............................................................................................................................................
																	20
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ........................................................................																20
2. MICROWAVE RADIATION TEST												...................................................................................................................
																21
3. COMPONENT TEST PROCEDURE													...............................................................................................................
																22
WIRING DIAGRAM				............................................................................................................................................................
																	23
											...............................................................................................................................
EXPLODED VIEW AND PARTS LIST																	24
1. DOOR ASSEMBLY					.........................................................................................................................................											25
2. CONTROL PANEL ASSEMBLY											......................................................................................................................
																25
3. TOTAL ASSEMBLY					.........................................................................................................................................											25

1

SAFETY AND 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 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 servicing, 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 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 the dealer immediately.

IMPORTANT

The wire in this mains lead coloured in accordance with the following code.

Green-and-yellow : Each

Blue	: Neutral
Brown	: Live

As the colours of the wires in the mains lead of this appliance may not correspond with the coloured markings identifying the terminals in your plug, proceed as follows.

The wire which is coloured green-and-yellow must be connected to the terminal in the plug which is marked with the letter E, earth symbol or coloured green-and-yellow.

The wire which is coloured blue must be connected to the terminal which is marked with the letter N or coloured black.

The wire which is coloured brown must be connected to the terminal which is marked with the letter L or coloured red.

NOTE

This oven is designed for counter-top use only.

2

SPECIFICATIONS

	POWER SUPPLY		230V/50Hz, SINGLE PHASE WITH EARTHING
	POWER	MICROWAVE	1200 W
		GRILL	1050 W
	CONSUMPTION
		COMBINATION	2200 W
	MICROWAVE ENERGY OUTPUT		800W
	MICROWAVE FREQUENCY		2450MHz
	OUTSIDE DIMENSIONS (WXHXD)		465 x 279 x 384mm
	CAVITY DIMENSIONS (WXHXD)		290 x 220 x 306mm
	NET WEIGHT		APPROX. 13.4Kg
	TIMER		35 min. DUAL SPEED
	POWER SELECTIONS		7 LEVELS
	CAVITY VOLUME		0.7 Cu.Ft.

* Specifications are subject to change without notice.

3

EXTERNAL VIEW

1. OUTER DIMENSION

465

384

4

2. FEATURE DIAGRAM

12 3 4 5

6

7

8

e wq 0 9

1Door seal - Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage.

2Reflector (Insulator Heater)

3Heating Element

4Oven cavity

5Safety interlock system

6Knob V.P.C - Used to select a microwave power level.

7Knob timer - Used in setting cooking time for all functions.

8Metal Rack

9Coupler - This fits over the shaft in the center of the ovens cavity floor. This is to remain in the oven for all cooking.

0Roller guide - This must always be used for cooking together with the glass cooking tray.

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

w Door viewing screen - Allows viewing of food.

The screen is designed so that light can pass through, but not the microwave.

eDoor hook - When the door is closed, it will automatically shut off.

If the door is opened while the oven is operating, the magnetron will immediately stop operating.

5

INSTALLATION

1. Steady, flat location.

This microwave oven should be set on a steady, flat surface.

2. Leave space behind and side.

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

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

Check your local power source.

This microwave oven requires a current of approximately 12 amperes, 230 Volts, 50 Hz. Power supply cord is about 0.8 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 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.

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 the oven to become room temperature before operating.

EARTHING INSTRUCTIONS

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 plug. The plug must be plugged into an outlet that is properly installed and earthed.

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, and either : If it is necessary to use an extension cord, use only a 3-wire extension cord that has a 3-blade earthing plut, 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.

6

OPERATIONS AND FUNCTIONS

This section includes useful information about oven operation.

1.Connect the mains 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 and roller guide 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 pulling the door. The oven will automatically shut off.

4.How to set each function

To set MICROWAVE cooking

•Set the variable power selector to the desired power level.

	SYMBOL	POWER	OUTPUT
		LEVEL	POWER
		WARM	26%
		DEFROST	41%
	1	MEDILUM	73%
	2	MED-HIGH	88%
	3	HIGH	100%

To set GRILL Cooking

•Set the POWER SELECTOR to the (grill) position.

To set COMBI Cooking

•Set the POWER SELECTOR to the (combi) position.

5.Set the time control by turning the timer knob and then microwave cooking starts.

•If turning the timer knob for less than 2 minutes, turn it past 2 minutes and then back to the desired time.

•During the same time, the rotating angle of the timer knob of the period from 35 to 10 minute is smaller than that of the period from 10 to 0 minute owing to the dual speed of the timer motor.

6.Microwave energy will be turned off auto matically when the timer reaches “OFF”. Then food can be taken out of the oven.

•To prevent the oven from operating with the door open, your microwave oven is fitted with safety door interlock switches.

•If you wish to inspect the food while it is cooking simply open the door. The oven will automatically stop cooking. To continue cooking, you simply close the door.

•If you wish to stop cooking, simply turn the timer knob to the “OFF” position. Cooking can be reset at any time during the cooking cycle by turning the timer control.

•Do not let the timer continue to operate after removing or when there is no food.

7.The safety lock prevents unwanted oven operation such as by small children. To set, pull down the side knob like the figure. To cancel, lift up the slide knob.

(KOG-6C675S ONLY)

UNLOCK

SLIDE KNOB

LOCK

8.NOTE : 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 handling tray.

7

DISASSEMBLY AND ASSEMBLY

Cautions to be observed when troubleshooting.

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 ware 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 earthed. It is imperative, therefore, to make sure it is earthed properly before beginning 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 voltage capacitor by using a properly insulated screwdriver to discharge.

	4.	When the 12A fuse is blown out due to the operation of the monitor
		switch; replace primary interlock switch, secondary interlock switch and
		interlock monitor switch.	SHORT
	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, need a care of 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.

8