KOR-633R0S
S/M No.:R633R0S001
Service Manual
Microwave Oven
MODEL :
KOR-633R0S
KOR-863R0S
D AEW OO ELECTR ONICS CO., LTD
http : //svc.dwe .co.kr
MAR. 2000
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
3. CONTROL PANEL ....................................................................................................................... 6
INSTALLATION ................................................................................................................................ 7
OPERATIONS AND FUNCTIONS ................................................................................................... 8
DISASSEMBLY AND ASSEMBLY .................................................................................................. 9
INTERLOCK MECHANISM AND ADJUSTMENT ........................................................................... 16
TROUBLE SHOOTING GUIDE ........................................................................................................ 17
MEASUREMENT AND TEST ........................................................................................................... 21
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ..................................................... 21
2. MICROWAVE RADIATION TEST ................................................................................................ 22
3. COMPONENT TEST PROCEDURE ............................................................................................ 23
WIRING DIAGRAM .......................................................................................................................... 24
PRINTED CIRCUIT BOARD ............................................................................................................ 25
1. CIRCUIT CHECK PROCEDURE ................................................................................................. 25
2. P.C.B CIRCUIT DIAGRAM ........................................................................................................... 29
3. P.C.B LOCATION NO .................................................................................................................. 30
EXPLODED VIEW AND PARTS LIST ............................................................................................. 32
1. DOOR ASSEMBLY ...................................................................................................................... 32
2. CONTROL PANEL ASSEMBLY ................................................................................................... 32
3. TOTAL ASSEMBLY ...................................................................................................................... 32
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 surface should be kept clean.
No greas,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 micrwave oven has concealead 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 manafacterer immediately.
IMPORTANT
The wire in this mains lead coloured in accordance with the following code.
Green-and-yellow : Earth
Blue : Neartral
Brown. : live
As the colours of the wires in the manins lead of this appliance may not correspond with the coloured makings
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 terminals 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 desigend for counter-top use only.
2
SPECIFICATIONS
MODEL
POWER SUPPLY 230V ~ 50Hz, SINGLE PHASE WITH EARTHING
POWER
CONSUMPTION
MICROWAVE ENERGY OUTPUT 800W 900W
MICROWAVE FREQUENCY 2450MHz
OUTSIDE DIMENSIONS(W X H X D) 465 x 279 x 365 mm
CAVITY DIMENSIONS (W X H X D) 290 x 220 x 306 mm
NET WEIGHT APPROX. 13Kg(28.7 lbs.) APPROX. 15Kg(33.1 lbs.)
TIMER 59min. 00 sec.
FUNCTION SELECTIONS MICROWAVE
POWER SELECTIONS 5 LEVELS
CAVITY VOLUME 0.7 Cu.Ft. 0.9 Cu.Ft.
MICROWAVE 1200W 1350W
GRILL
COMBINATION
KOR-633R KOR-863R
495 x 294 x 392 mm
(18.3 x 11.0 x 14.4 in.)
(11.4 x 8.7 x 12.0 in)
(19.5 x 11.6 x 15.4 in.)
320 x 244 x 338 mm
(12.6 x 9.6 x 13.3 in)
* SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.
3
EXTERNAL VIEW
279/294
1. OUTER DIMENSION(KOR-633R/KOR-863R)
465/495
365/392
4
2. FEATURE DIAGRAM
EXTERNAL VIEW
15 4
9
6
23
7
8
1. Safety interlock system
2. Door screen - Allows viewing of food. The screen is transparent to light, but prevents microwaves escaping.
3. Door hook - When the door is closed, it will automatically shut off. If the door is opened while the oven operating,
the magnetron tube will immediately stop operating.
4. Oven cavity
5. Door seal - Door seal surfaces prevent microwave escaping from the oven cavity.
6. Glass cooking tray - Made of special heat resistant glass. The tray can be easily removed for cleaning. Make sure it is
correctly positioned(indentation) before operating. Place food in a suitable container(dish) on the tray.
7. Roller guide - Supports the glass cooking tray.
8. Coupler - This fits over the shaft in the center of the ovens cavity floor. This is to remain in the oven for all cooking.
9. Control panel
5
EXTERNAL VIEW
3. Control panel
1
2
3
4
5
6
7
8
-
1. Auto cook - Used to cook using a program or to reheat.
2. Defrost - Used to defrost foods by weight or time.
3. Power - Used to set power level.
4. Clock - Used to set clock.
5. Display - Cooking time, power level, indicators and present time are displayed.
6. Stop/Clear - Used to stop the oven operation or to erase all entries.
7. Strat/Easy cook - Used to start the oven operation and also increase the reheat time by 30 seconds.
8. Dial Knob - Used to set the time and weight.
6
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. Position the oven as far from them as possible.
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.
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 amprer 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 applicance 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.
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.
7
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 off.
5. 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 button.
6. Each time a button 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 button 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 button once more. If the oven door is opened during
the oven operation, all information is retained.
11. If the Start button is touched and the oven does not operate, check the area between the door and door seal for obstructions
and make sure the door is closed securely.
The oven will not start cooking until the door is completely closed or the program has been reset.
Make sure the oven is properly installed and plugged into the electrical outlet.
Wattage output chart
The power level is set by pressing the Power button. The chart shows the display, the power level and the percentage of power.
Touch Power button Power level (Display) Approximate Percentage of power
Once P-HI 100 %
Twice P-80 80 %
3 times P-60 60 %
4 times P-40 40 %
5 times P-20 20 %
8
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 scredriver and ware rubber gloves when servicing the high voltage side.
3. Discahrge the high voltage capacitor before touching any oven components or wiring.
(1) Check the earthed.
Do not operate on a two-wire extension cord.
The microwave oven is designed to be used with earthed.
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 12A 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.
WARNING
When servicing th 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, HVFuse.
SHORT
9
DISASSEMBLY AND ASSEMBLY
1. To remove cabinet
1) Remove three screws on cabinet back.
2) Push the cabinet backward.
2. To remove door assembly
1) Remove 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.
10
3. To remove door parts.
DISASSEMBLY AND ASSEMBLY
A06
A05
A04
A03
A02
A01
A07
A08
(1) KOR-633R0S
REF NO.
A01
A02
A03
A04
A05
A06
A07
A08
PART CODE
3512203860
3517005630
3515204100
3511705500
3517002800
3512300200
3513100700
3515101300
PART NAME DESCRIPTION Q’TY REMARK
FRAME DOOR ABS SG-175 1
BARRIER-SCREEN*O SAN 1
STOPPER HINGE*T AS KOR-63150S 1
DOOR WELD AS KOR-61150S 1
BARRIER-SCREEN*I POLYESTER T0.1 1
GASKET DOOR PP 1
HOOK POM 1
SPRING HOOK PW1 1
(2) KOR-863R0S
REF NO. PART CODE PART NAME DESCRIPTION Q'TY REMARK
A01 3512204170 FRAME DOOR ABS SG-175 1
A02 3517005740 BARRIER-SCREEN *O ACRYL 1
A03 3515204100 STOPPER HINGE *T AS KOR-63150S 1
A04 3511705620 DOOR WELD AS KOR-81250S 1
A05 3517002900 BARRIER-SCREEN *I POLYESTER T0.1 1
A06 3512300400 GASKET DOOR PP 1
A07 3513100700 HOOK POM 1
A08 3515101300 SPRING HOOK PW1 1
11
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