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Service Manual
Microwave Oven
Model: KOG-37470S
DAEWOO ELECTRONICS CO., LTD.
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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 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.
(c) Before turning on power to the microwave oven for any service test or inspection within the microwave gen-
erating compartments, check the magnetron, wave guide or transmission line, and cavity for proper align-
ment, 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
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
TROUBLE SHOOTING 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 .........................................................................................................................................24
2. CONTROL PANEL ASSEMBLY......................................................................................................................24
3. TOTAL ASSEMBLY.........................................................................................................................................24
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 CDRH 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.
2
SPECIFICATIONS
MODEL KOG-37470S
POWER SUPPLY 230V~50Hz, SINGLE PHASE WITH EARTHING
MICROWAVE 1200 W
POWER 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 360 mm
CAVITY DIMENSIONS (W X H X D) 290 x 220 x 306 mm
NET WEIGHT Approx. 13.4 kg
TIMER 60 min. Dual Speed
FUNCTION SELECTIONS MICROWAVE / GRILL / COMBINATION
POWER SELECTIONS 7 LEVELS
CAVITY VOLUME 0.7 Cu. Ft.
* SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.
3
EXTERNAL VIEW
1. OUTER DIMENSION
4
2. FEATURE DIAGRAM
13 2 3
7
12 4 10 9 11
8
1. Door seal - Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage.
2. Reflector (Insulator Heate)
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 cook-
ing.
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.
5
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.
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 6 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 acci-
dent 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.
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 wire with a
earthing plug. The plug must be plugged into an outlet that is properly installed ant 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 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.
6
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. Choose cooking power level by setting V.P.C knob to the desired
position. Refer to cookbook for recommended power levels.
5. Determine cooking time. Consult cookbook for recipe timing.
Oven light turns on and cooling fan starts to operate. Microwave
cooking starts.
6. You may open the door while the oven is operating. As soon as
the door is opened, the safety mechanisms stop the generation of NOTE
microwave power and the operation of cooking timer. 1. When setting timer for less than 2 minutes,
If you wish to change the time during cooking, simply adjust the tum the timer past 2 minutes and then
return to the correct timer setting.
timer to the desired time.
2. Various clicking noises may be heard
7. When the timer reaches zero, a bell will ring and the unit will turn when turning V.P.C knob. This is normal
off. Oven light turns off. If additional cooking time is needed and and does not affect the operation of your
the door is closed, the oven will automatically start when the timer microwave oven.
is reset.