Daewoo KQG-63N75S, KOG-63N7 Service Manual

Service Manual

Microwave Oven

Model: KQG-63N75S

DAEWOO ELECTRONICS CORP.

S/M No. : G63N75S001

http : //svc.dwe.co.kr Jan. 2004

✔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 micro-

wave 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.

erating 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 per-

formed 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........................................................................................................................................4

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

OPERATIONS AND FUNCTIONS.......................................................................................................................................6

DISASSEMBLY AND ASSEMBLY......................................................................................................................................7

INTERLOCK MECHANISM AND ADJUSTMENT.............................................................................................................15

TROUBLE SHOOTING GUIDE .........................................................................................................................................16

MEASUREMENT AND TEST ............................................................................................................................................18

1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ........................................................................18

2. MICROWAVE RADIATION TEST ...................................................................................................................19

3. COMPONENT TEST PROCEDURE...............................................................................................................20

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

EXPLODED VIEW AND PARTS LIST...............................................................................................................................22

1. DOOR ASSEMBLY .........................................................................................................................................22

2. CONTROL PANEL ASSEMBLY......................................................................................................................22

3. TOTAL ASSEMBLY.........................................................................................................................................22

SAFETY AND PRECA UTIONS

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,

(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 immediately.

IMPORTANT

The wire in this mains lead coloured in accordance with the following code. Green-and-yellow : Earth

Blue : Neutral Brown : Live

As the colours of the wires in the manins 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 :

The oven is designed for counter-top use only.

SPECIFICATIONS

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

POWER

MICROWAVE 1200 W

CONSUMPTION

GRILL 1050 W

COMBINATION 2200 W MICROWAVE ENERGY OUTPUT 800W MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W x H x D) 465 x 279 x 360mm CAVITY DIMENSIONS (W x H x D) 290 x 208 x 306mm NET WEIGHT APPROX. 14Kg TIMER 35 min. DUAL SPEED POWER SELECTIONS 7 LEVELS CAVITY VOLUME 0.7 Cu.Ft.

* Specifications are subject to change without notice.

EXTERNAL VIEW

1. OUTER DIMENSION

465

279

360

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

2. Cover Heater

3. Heating Element

4. Oven cavity

5. Safety interlock system

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

7. Knob timer - Used in setting cooking time for all functions. 8 Metal Rack

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

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

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

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

microwave.

13. Door 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.

2. FEATURE DIAGRAM

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.

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 10 amperes, 230Volts, 50Hz grounded outlet. 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 samaged, 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 ant earthed.

INSTALLATION

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 accpt 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

Connect the mains lead to an electrical outlet.

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

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

How to set each function To set MICROWAVE cooking

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

To set GRILL Cooking

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

To set COMBI Cooking

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

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 60 to 10 minute is smaller than that

of the period from 10 to 0 minute owing to the dual speed of the timer motor.

Microwave energy will be turned off automatically when the timer point to "OFF". Then take out foods.

• To prevent the oven operating with the door open, your microwave oven is fitted with safety door interlock switches. If you wish to inspect the food during the cooking time, simply open the door.

The oven will automatically stop cooking. To continue cooking, you simply close the door.

• If you wish to stop cooking during the cooking, simply turn the timer knob the point "OFF". Cooking can be reset at any time during the cooking cycle by only turning the timer knob.

• Do not let the timer continue to operate after removing food.

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.

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.

1 2

3 4

SYMBOL POWER LEVEL OUTPUT POWER

WARM 26%

DEFROST 41% 580W MEDILUM 73% 700W MED-HIGH 88%

MAX HIGH 100%

UNLOCK

LOCK

SLIDE KNOB

OPERATIONS AND FUNCTIONS

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 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 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 2-wire extension cord. The microwave oven is designed to be used with 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 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 15A fuse is blown out 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.

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 - HV Transformer, Magnetron, HV Capacitor, HV Diode, HV fuse.

SHORT

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