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S/M No. :
R63DB9S002
Service Manual
Microwave Oven
Model: KOR-63DB9S
KOR-63DB0S
KOR-63FB9S
KOR-63FB0S
✔
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 CO., LTD.
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. PCB CIRCUIT DIAGRAM................................................................................................................................28
3. P.C.B. LOCATION NO ....................................................................................................................................29
EXPLODED VIEW AND PARTS LIST...............................................................................................................................30
1. DOOR ASSEMBLY .........................................................................................................................................30
2. CONTROL PANEL ASSEMBLY......................................................................................................................30
3. TOTAL ASSEMBLY.........................................................................................................................................30
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 : Each
Blue
Brown
: Neutral
: 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
This oven is designed for counter-top use only.
2
SPECIFICATIONS
MODEL
POWER SUPPLY
POWER
CONSUMPTION
MICROWAVE
GRILL
COMBINATION
MICROWAVE ENERGY OUTPUT
MICROWAVE FREQUENCY
OUTSIDE DIMENSIONS (W X H X D)
CAVITY DIMENSIONS (W X H X D)
NET WEIGHT
TIMER
FUNCTION SELECTIONS
POWER SELECTIONS
CAVITY VOLUME
KOR-63DB9S
1000W
KOR-63DB0S
230V-50Hz, SINGLE PHASE WITH EARTHING
1200W
700W 800W
2450MHz
465 x 279 x 342 mm (18.3 x 11.0 x 13.5 in)
290 x 220 x 306 mm (11.4 x 8.7 x 12.0 in)
APPROX. 13 kg (28.7 Ibs.)
59 min. 90 sec.
MICROWAVE
10 LEVELS
0.7 Cu. Ft.
* SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.
MODEL
POWER SUPPLY
POWER
CONSUMPTION
MICROWAVE
GRILL
COMBINATION
MICROWAVE ENERGY OUTPUT
MICROWAVE FREQUENCY
OUTSIDE DIMENSIONS (W X H X D)
CAVITY DIMENSIONS (W X H X D)
NET WEIGHT
TIMER
FUNCTION SELECTIONS
POWER SELECTIONS
CAVITY VOLUME
KOR-63FB9S
1000W
KOR-63FB0S
230V-50Hz, SINGLE PHASE WITH EARTHING
1200W
700W 800W
2450MHz
465 x 279 x 349 mm (18.3 x 11.0 x 13.8 in)
290 x 220 x 306 mm (11.4 x 8.7 x 12.0 in)
APPROX. 13 kg (28.7 Ibs.)
59 min. 90 sec.
MICROWAVE
10 LEVELS
0.7 Cu. Ft.
* SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.
3
EXTERNAL VIEW
1. OUTER DIMENSION
(1) KOR-63DB9S/63DB0S
(2) KOR-63FB9S/63FB0S
4
2. FEATURE DIAGRAM
Door seal maintains the microwave within the oven cavity and prevents microwave leakage.
When the door is closed, it will automatically lock shut. If door is opened while oven is operating, magnetron tube will immediately stop operating.
Allows viewing of food. Microwave cannot pass through perforations in screen.
Protects the microwave outlet from splashes of cooking foods.
Automatically turns on during oven operating.
6. SAFETY INTERLOCK SYSTEM
8. GLASS COOKING TRAY
Made of special heat resistant 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 cooling tray.
5
3. CONTROL PANEL
2
3
5
7
8
0
1
M/W DEF.
END
POWER DEFROST CLOCK
AUTO COOK
BEVERAGE
MORE
LESS
PROZEN PIZZA
10MIN
1HOUR
STOP
CLEAR
1 MIN
10MIN
PASTA
10SEC
1MIN
START
SPEEDY COOK
4
6
9 q
1 1. Display – Cooking time, power level, indicators and present time are displayed.
1 2. Power – Used to set power level.
1 3. Defrost – Used to defrost foods. (for time)
1 4. Clock – Used to set clock.
1 5. Auto cook – Used to cook or reheat.
1 6. One touch – Used to cook or reheat specific quantities of food.
1 7. More – Used to add time to cooking.
1 8. Less – Used to remove time from cooking.
1 9. Time set pad – Used to set the cooking time and the present time.
10. Stop/Clear – Used to stop the oven operation or to delete the cooking data.
11. Start/Speedy cook – Used to start the oven and also used to set a reheat time.
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 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, 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.
7
OPERATIONS AND FUNCTIONS
1 1. Connect the main lead to an electrical outlet.
1 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.
1 3. Close the door securely.
1 4. When the oven door is opened, the light turns ON.
1 5. The oven door can be opened at any time during operation.
The oven will automatically shut off. To restart the oven, close the door and then touch START.
1 6. The oven automatically cook on full power unless set to a lower power level.
1 7. The display will show : 0 when the oven is plugged in.
1 8. Time clock returns to the present time when the cooking time ends.
1 9. When the CANCEL button is touched during the oven operatiion, the oven stops cooking and all information retained.
To erase all information (except the present time), touch the CANCEL button once more. If the oven door is opened during the oven operation, all information is retained.
10. If the START button is touched and the oven does not operate, check the 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.
Make sure the oven is properly installed and plugged into the electrical.
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
Once
Twice
3 times
4 times
5 times
6 times
7 times
8 times
9 times
10 times
11 times
Power level(Display)
P-HI
P-90
P-80
P-70
P-60
P-50
P-40
P-30
P-20
P-10
P-00
Approximate Percentage of Power
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
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 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 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.
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.
9
1. To remove cabinet
1) Remove three screws on cabinet back.
2) Push the cabinet backward.
2. To remove door assembly
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.
10
✔ Caution:
In this Service 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)
3. To remove door parts.
REF NO.
PART CODE
A01 3512203880
A02
3512205200
3517007300
A03
A04
A05
A06
A07
A08
3515204100
3511705500
3517002800
3512300200
3513100700
3515101300
PART NAME
FRAME DOOR
FRAME DOOR
BARRIER-SCREEN*0
STOPPER SINGE *T AS
DOOR WELD AS
BARRIER-SCREEN *I
GASKET DOOR
HOOK
SPRING HOOK
PP SI83C
DESCRIPTION
PP SI83C
PET T0.125
KOR-63150S
KOR-61150S
T0.1
PP
POM
PW -1
1
1
1
1
Q’TY REMARK
1 KOR-63DB
1
1
KOR-63FB
1
1
11
(1) Remove the gasket door from door weld as.
(2) Remove the door frame from door weld as.
(3) Remove the stopper hinge top from door weld as.
(4) Remove the spring and the hook.
(5) Remove the barrier screen outer from door frame.
(6) Reverse the above steps for reassembly.
4. Method to reduce the gap between the door seal and the oven front surface.
(1) To reduce gap located on part ‘A’
Loosen a screws on stopper hinge top, and then push the door to contact the door seal to oven front surface.
Tighten two screws.
(2) To reduce gap located on part ‘B’
Loosen two screws on stopper hinge under, and then push the door to contact the door seal to oven front surface.
Tighten two screws.
NOTE : A small gap may be acceptable if the microwave leakage does not exceed 4mW/cm 2 .
12
✔ Caution:
In this Service 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)
5. To remove control panel parts.
REF NO.
PART CODE
B01 3518520960
B02
3518520970
3516725300
B03
B04
B05
B06
B07
3516725350
3514320670
7122401211
3513702710
441G430171
3516906940
3516906950
PART NAME
SWITCH MEMBREANE
SWITCH MEMBRANE
CONTROL PANEL
CONTROL PANEL
PCB AS
SCREW TAPPING
LEVER DOOR OPEN
SPRING BUTTON
BUTTON DOOR OPEN
BUTTON DOOR OPEN
DESCRIPTION
KOR-63DB9S
KOR-63FB9S
ABS SG-0760D, SG-175
ABS SG-0760D, SG-175
KOR-63DB9S
T2S TRS 4X12 MFZN
PP
SWP DIA0.7
ABS SG-0760D, SG-175
ABS SG-0760D, SG-175
3
1
1
1
Q’TY REMARK
1 KOR-63DB
1
1
KOR-63FB
KOR-63DB
KOR-63FB
1
1
1
KOR-63DB
KOR-63FB
1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly.
2) Remove the door open lever from the control panel.
3) Remove four screws which secure the PCB assembly to control panel.
4) Disconnect membrane tail from the connector of the PCB assembly.
5) Detach membrane from the control panel.
6) Remove door open button and button spring from the control panel.
7) Reverse the above steps for reassembly.
13
6. To remove high voltage capacitor.
1) Remove a screw which secure the grounding ring terminal of the H.V. diode and the capacitor holder.
2) Remove the H.V. diode from the capacitor holder.
3) Reverse the above steps for reassembly.
◆
High voltage circuit wiring
7. To remove magnetron.
1) Remove a screw which secure the magnetron.
2) Remove the magnetron.
3) Reverse the above steps for reassembly.
NOTE : Never install the magnetron without the metallic gasket plate which is packed with each magnetron to prevent microwave leakage. Whenever repair work is carried out on magnetron, check the microwave leakage. It shall not exceed 4mW/cm 2 for a fully assembled oven with door normally closed.
14
8. To remove wind guide assembly.
1) Remove a screw for earthing.
2) Remove the noise filter from the wind guide.
3) Remove a screw which secure the wind guide assembly.
4) Draw forward the wind guide assembly.
5) Pull the fan from the motor shaft.
6) Remove two screws which secure the motor shaded pole.
7) Remove the motor shaded pole.
8) Reverse the above steps for reassembly.
9. To remove H.V.transformer.
1) Remove four screws holding the H.V.transformer.
2) Remove the H.V.transformer.
3) Reverse the above steps for reassembly.
15
INTERLOCK MECHANISM AND ADJUSTMENT
The door lock mechanism is a device which has been specially designed to completely eliminate microwave radiation when the door is opened during operation, and thus to perfectly prevent the danger resulting from the leakage of microwave.
(1) Primary interlock switch
When the door is closed, the hook locks the oven door. If the door is not closed properly, the oven will not operate.
When the door is closed, the hook pushes the button of the microswitch. Then the button of the primary interlock switch bring it under “ON” condition.
(2) Secondary interlock switch and interlock monitor switch
When the door is closed, the hook pushes the lock lever downward. The lock lever presses the button of the interlock monitor switch to bring it under “NO” condition and presses the button of the secondary interlock switch to bring it under
“ON” condition.
ADJUSTMENT :
Interlock monitor switch
When the door is closed, the interlock monitor switch should be changed(NO condition) before other switches are closed.
When the door is opened, the interlock monitor switch should be changed(NC condition) after other switches are opened.
(3) Adjustment steps a) Loosen the two mounting screws.
b) Adjust interlock switch assembly position.
c) Make sure that lock lever moves smoothly after adjustment is completed.
d) Tighten completely two mounting screws.
NOTE :
Microwave emission test should be performed after adjusting interlock mechanism. If the microwave smission exceed
4mW/cm 2 , readjust interlock mechanism.
16
TROUBLE SHOOTING GUIDE
Following the procedure below to check if the oven is defective or not.
1. Check grounding before trouble checking.
2. Be careful of the high voltage circuit.
3. Discharge the high voltage capacitor.
4. When checking the continuity of the switches, fuse or high voltage transformer, disconnect one lead wire from these parts and check continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your meter.
NOTE : When electric parts are checked, be sure the power cord is not inserted the wall outlet.
Check wire harness, wiring and connected of the terminals and power cord before check the parts listed below.
(TROUBLE 1) Oven does not operate at all ; any inputs can not be accepted.
CONDITION
Fuse blows.
CHECK
Check continuity of interlock monitor switch with door closed
Check continuity of both primary and secondary interlock switch with door colosed
Check continuity of primary interlock switch contact with door partially open until interlock monitor switch contact close
(COM ↔ NO)
Check continuity of primary winding of low voltage transformer
Disconnect high voltage fuse and operate the unit
RESULT
Continuity
No Continuity
No Continuity
Continuity
Continuity
CAUSE
Malfunction of interlock monitor switch
Malfunction of interlock switch
Shorted contacts of primary interlock switch.
0
Ω or infinite
Approx.
150~310
(normal)
Fuse again blows
Defective low voltage transformer
Defective low voltage transformer
REMEDY
Replace
NOTE 1
Replace
NOTE 1
Replace
NOTE 1
Replace
Replace
17
CONDITION
Outlet has proper voltage Fuse does not blow.
CHECK
Check continuity of magnetron
Check continuity of noise filter board
Check continuity of power supply cord
RESULT
No
Continuity
No
Continuity
No
Continuity
Normal
CAUSE
Defective magnetron
Defective magnetron
Open power supply cord
Defective touch control circuit
REMEDY
Replace
Replace
Replace
Replace
NOTE
All these switches must be replaced at the same time, please refer to “Interlock Mechanism And Adjustment”.
(TROUBLE 2) Display shows all figures selected, but oven does not start cooking, even though desired program and time are set and start button is tapped.
CONDITION
Turn table motor and oven lamp do not turn on
CHECK
Check continuity of primary interlock switch
Check continuity of secondary interlock switch
Check D.C. voltage being supplied to RELAY (RY2) coil
RESULT
No
Continuity
No
Continuity
0 V
Approx.
12 VDC
CAUSE
Malfunction of primary interlock switch
Malfunction of secondary interlock switch
Defective touch control circuit
Faulty contacts of
RELAY (RY2) or open relay coil
REMEDY
Adjust or replace
Adjust or replace
Replace
Replace
18
(TROUBLE 3) No microwave oscillation even though fan motor rotates.
CONDITION
No microwave oscillation
CHECK
Check continuity of high voltage fuse
Replace high voltage fuse
Check continuity of high voltage capacitor terminals with wires removed
Check continuity of high voltage rectifier in forward and backward direction with DC megger
Connect megger leads to magnetron terminal and magnetron body
Check resistance of primary and secondary coil of high voltage transformer
Check continuity of magnetron with wires removed
RESULT
Continuity
Continuity
Continuity in backward direction
Continuity
0
Ω or
No
∞
Continuity
Check continuity of filament terminal of high voltage transformer
Check D.C. voltage being supplied to RELAY (RY1) coil
No
Continuity
0 V
Approx
15 VDC
CAUSE
Defective high voltage transformer
Defective high voltage rectifier
Defective magnetron
Defective high voltage transformer
Defective magnetron
Defective high voltage transformer
Defective touch control circuit
Faulty contacts or
RELAY (RY1) or open relay coil
REMEDY
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Replace
19
(TROUBLE 4) The following visual conditions indicate a probable defective touch control circuit or membrane switch assembly.
1 1. Incomplete segments
(1) Segments missing
(2) Partical segments missing
(3) Digit flickering other than normal display slight flickering
(4) “ :0” does not display when power is on.
1 2. A distinct changes in the display are not on when they should be.
1 3. One or more digits in the display are not on when they should be.
1 4. Display indicates a number different from one touched.
1 5. Specific numbers (for example 2 or 3) will not display when the button is touched.
1 6. Display does not count down or up with time cooking or clock operation.
1 7. Oven is programable and cooks normally but no display shows.
1 8. Display obviously jumps in time while counting down.
1 9. Display counts down noticeably too fast while cooking.
10. Display does not show the time of day when cancel button is touched.
11. Oven lamp and turntable motor do not stop although cooking is finished. Check if the RELAY 2 contacts close if they are close, replace touch control circuit.
CONDITION
Display does not show programming at all, even if keyboard is touched.
CHECK
Check rach pad for continuity of the membrane keyboard for the following keyboard check procedure
RESULT
Normal
Abnormal
CAUSE
Malfunction of touch control circuit of control box sub-assembly
Malfunction of the membrane keyboard
REMEDY
Replace control box subassembly
Replace the membrane keyboard
NOTE
Before following the particular steps listed above in the trouble shooting guide for the membrane keyboard's, failure, please check for the continuity of each wire-harness between the membrane keyboard and P.C.B.
assembly.
20
MEASUREMENT AND TEST
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT
Microwave output power can be checked by indirectly measuring the temperature rise of a certain amount of water exposed to the microwave as directed below.
PROCEDURE
1. Microwave power output measurement is made with the microwave oven supplied at rated voltage and operated at its maximum microwave power setting with a load of 1000±5cc of potable water.
2. The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190 mm.
3. The oven and the empty vessel are at ambient temperature prior to the start of the test.
The initial temperature of the water is 10±2˚C (50±3.6˚F)
It is measured immediately before the water is added to the vessel.
After addition of the water to the vessel, the load is immediately placed on the center of the shelf, which is in the lowest normal position.
4. Microwave power is switched on.
5. Heating time should be exactly A seconds. (Refer to table as following)
Heating time is measured while the microwave generator is operating at full power.
The filament heat-up time for magnetron is not included.
6. The initial and final temperature of water is selected so that the maximum difference between the ambient and final water temperature is 5K.
7. The microwave power output P in watts is calculated from the following formula :
P=4187 X ▲ T/t
• ▲ T is difference between initial and ending temperature.
• It is the heating time.
The power measured should be B (Refer to SPECIFICATIONS)W±10.0%.
CAUTION :
1. Water load should be measured exactly to 1 liters.
2. Input power voltage should be exactly specified voltage(Refer to SPECIFICATIONS).
3. Ambient temperature should be 20±2˚C(68±3.6˚F)
Heating time for power output:
A(second)
B(W)
70
600
64
650
60
700
56
750
52
800
49
850
47
900
44
950
42
1000
40
1050
38
1100
21
2. MICROWAVE RADIATION TEST
CAUTION :
1. Make sure to check the microwave leakage before and after repair of adjustment.
2. Always start measuring of an unknown field to assure safety for operating personnel from microwave energy.
3. Do not place your hands into any suspected microwave radiation field unless the safe density level is known.
4. Care should be taken not to place the eyes in direct line with the source of microwave energy.
5. Slowly approach the unit under test until the radiometer reads an appreciable microwave leakage from the unit under the test.
PROCEDURES
1. Prepare Microwave Energy Survey Meter, 600cc glass beaker, and glass thermometer 100˚C(212˚F).
2. Pour 275cc±15cc of tap water initially at 20±5˚C(68±9˚F) in the 600cc glass beaker with an inside diameter of approx.
95mm(3.5in.).
3. Place it at the center of the tray and set it in a cavity.
4. Close the door and operate the oven.
5. Measure the leakage by using Microwave Energy Survey
Meter with dual ranges, set to 2450MHz.
1) Measured radiation leakage must not exceed the value prescribed below. Leakage for a fully assembled oven with door normally closed must be less than 4mW/cm 2 .
2) When measuring the leakage, always use the 5cm(2in.) space cone with probe. Hold the probe perpendicular to the cabinet and door. Place the space cone of the probe on the door, cabinet, door seem, door viewing screen, the exhaust air vents and the suction air vents.
3) Measuring should be in a counter-clockwise direction at a rate of 1 in./sec. If the leakage of the cabinet door seem is unknown, move the probe more slowly.
4) When measuring near a corner of the door, keep the probe perpendicular to the areas making sure the probe end at the base of the cone does not get closer than 2 in. from any metal. If it does not, erroneous reading may result.
22
3. COMPONENT TEST PROCEDURE
• High voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle.
• It is neither necessary nor advisable to attempt measurement of the high voltage.
• Before touching any oven components or wiring, always unplug the oven from its power source and discharge the capacitor.
1. High voltage transformer
(1) Remove connections from the transformer terminals and check continuity.
(2) Normal readings should be as follows:
Secondary winding ...................Approx. 140
Ω
±10%
Filament winding....................................Approx. 0
Ω
Primary winding .....................................Approx. 2
Ω
2. High voltage capacitor
(1) Check continuity of capacitor with meter on the highest OHM scale.
(2) A normal capacitor will show continuity for a short time, and then indicate 10M
Ω once the capacitor is charged.
(3) A shorted capacitor will show continuous continuity.
(4) An open capacitor will show constant 10M
Ω
.
(5) Resistance between each terminal and chassis should be infinite.
3. High voltage diode
(1) Isolate the diode from the circuit by disconnecting the leads.
(2) With the ohmmeter set on the highest resistance scale measure the resistance across the diode terminals.
Reverse the meter leads and again observe the resistance reading.
Meter with 6V, 9V or higher voltage batteries should be used to check the front-back resistance of the diode, otherwise an infinite resistance may be read in both directions.
A normal diode’s resistance will be infinite in one direction and several hundred K
Ω in the other direction.
4. Magnetron
For complete magnetron diagnosis, refer to “Measurement of the Microwave Power Output”.
Continuity checks can only indicate and open filament or a shorted magnetron.
To diagnose for an open filament or a shorted magnetron.
(1) Isolate magnetron from the circuit by disconnecting the leads.
(2) A continuity check across magnetron filament terminals should indicate 0.1
Ω or less.
(3) A continuity check between each filament terminal and magnetron case should read open.
5. Fuse
If the fuse in the primary and monitor switch circuit is blown when the door is opened, check the primary and monitor switch before replacing the blown fuse.
In case the fuse is blown by an improper switch operation, replace the defective switch and fuse at the same time.
Replace just the fuse if the switches operate normally.
23
WIRING DIAGRAM
24
PRINTED CIRCUIT BOARD
1. CIRCUIT CHECK PROCEDURE
1. Low Voltage Transformer check
• The low voltage transformer is located on the P.C.B.
• Measuring condition: input voltage : 230V/Frequency : 50Hz
Terminal Voltage
4-8
LOAD
AC 25.8 V
NO LOAD
AC 31.8 V
NOTE :
1. Refer to Circuit Diagram (point 4).
2. Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source voltage.
3. The allowable tolerance of the secondary voltage is within ± 5% of nominal voltage.
2. Voltage check
• Key check point
NO
1
2
CHECK POINT
IC 1 PIN 14
IC 1 PIN 22
REMARK
-5 VDC
T:20ms(50Hz)
3 IC 1 PIN 1 OR 2
T:250ns(4MHz)
• Check method
NO MEASURE POINT
1
2
MP1
MP2
WAVE FORM
DC -5V±0.25V
DC -12V±2.0V
REMEDY
Replace VL1, EC1
Replace EC2, D9, 10, 11
REMARK
NO LOAD
NO LOAD
NOTE :
Each measure point must be measured with GND points.
25
MP1
MP2
Measure Point
26
3. When there is no microwave oscillation
1) When touching START pad, oven lamp does not turn on.
Fan motor does not rotate, but cook indicator in display comes on.
* Cause : RELAY 2 does not operate. → refer to Circuit Diagram (Point 3)
- Check method
POINT
STATE
A
RELAY 2 ON -5VDC
RELAY 2 OFF GND
2) When touching START pad, oven lamp turns on.
Fan motor and turntable rotate and cook indicator in display comes on.
* Cause : RELAY 1 does not operate. → refer to Circuit Diagram (Point 2)
- Check method
POINT
STATE
A
RELAY 1 ON -5VDC
RELAY 1 OFF GND
B
GND
-12VDC
B
GND
-12VDC
4. When the door is opened during operation, the count down timer does not stop.
→ refer to Circuit Diagram (Point 1)
-Check method
POINT
STATE
A
1) DOOR OPEN OPEN
2) DOOR CLOSED CLOSE
CHECK NO
1
METHOD
Check the stage (ON, OFF) of the door open monitor switch by resistance measurement.
B
-5VDC
GND
REMEDY
Replace door open monitor switch.
5. When the digital clock does not operate properly.
→ refer to Circuit Diagram (Point 5)
POINT
A
WAVE FORM
T:20ms(50Hz)
* If clock does not keep exact time, you must check resistor R23, 24 zener diode ZD2.
27
2. PCB CIRCUIT DIAGRAM
28
✔ Caution:
In this Service 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)
3. P.C.B. LOCATION NO.
1) KOR-63DB9S/KOR-63FB9S
NO.
1
2
3
4
5
6
7
8
9
NAME
CAPACTIOR ELEC
CAPACTIOR ELEC
CONNECTOR WAFER
CONNECTOR FILM
CONNECTOR WAFER
DIODE RECTIFY
DIODE RECTIFY
DIODE ZENER
DIODE ZENER
10 LED DISPLAY
11
12 C ARRAY
13
PCB MAIN
R ARRAY
14 REGISTER
15
16 REGISTER
17
REGISTER
REGISTER
18 REGISTER
19
20 REGISTER
21
REGISTER
REGISTER
EC1
EC2
CN1
CN2
CN3
D1~9
D10, D11
ZD1
ZD2
DP1
M171
CA1
RA1
SYMBOL
R1, R2, R5~R9
R4, R14, R20
R3
R15, R16
R21
R10~13, R19, R23~24
R17
R22
22 RESONATOR CERAMIC CR1
23 IC REGULATOR
24 TRANSISTOR
VL1
Q1~7
25 TRANSISTOR
26 TRANS POWER
27 WIRE COPPER
28 WIRE COPPER
Q9
LVT
J2~J4, J8~J10, SJ2
J1, J5, J6, J11
29 IC MICOM
30 SW RELAY
31 SW RELAY
32 CAPACITOR CERA
IC1
RY1
RY2
C1~6
SPECIFICATION
16V RS 100MF
25V RSS 1000MF
YW396-02V
FCZ 254-10P
YW396-05AV
1N4148
KN4004A
UZ- 3.3BSB 1/2W
UZ- 5.1BSB 1/2W
DDRG-63DB
81.5X139.9
5102M
6P(5) 1/8 100K J
1/6W 330 5%
1/6W 1K 5%
1/6W 4.7K 5%
1/6W 100K 5%
1/6W 100 5%
1/6W 10K 5%
1/6 1M 5%
1/4W 51 5%
4.00MTS
MC7905C
KRA-106M
KTA-1266Y
DMR-63KFS(35X11)
1/0.52 TIN COATING(7.5MM)
1/0.52 TIN COATING(10MM)
TMP47C443N-1D99
G5G-1A-1C-12V
OJ-SS-112LM
104 50V Z AXIAL
RD-AZ472J-
RD-AZ104J-
RD-AZ101J-
RD-AZ103J-
RD-AZ105J-
RD-4Z510J-
5P4R00MTS-
1MC7905C--
TZRA106M--
TZTA1226Y-
5EPV035306
85801052GY
85801052GY
13GS63DB00
5SC0101121
5SC0101404
CCZF1H104Z
PART CODE Q'TY
CEXF1C101V 1
CEXF1E102V
351915020
1
1
441M367150
3519150510
DZN4148---
DZN4004A--
9
2
1
1
DZUZ3R3BSB
DZUZ5R1BSB
DDDRG63DB-
3514324000
CN5XB-102M
RA-86X104J
RD-AZ331J-
RD-AZ102J-
7
3
1
1
1
1
1
1
1
1
4
1
6
1
7
7
1
1
1
1
1
1
7
1
2
29
EXPLODED VIEW AND PARTS LIST
1. DOOR ASSEMBLY
Refer to Disassembly and assembly.
2. CONTROL PANEL ASSEMBLY
Refer to Disassembly and assembly.
3. TOTAL ASSEMBLY
30
✔ Caution:
In this Service 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)
F01
F02
F03
F08
F09
F10
F11
F04
F05
F06
F07
F16
F17
F18
F19
F12
F13
F14
F15
F20
F21
F22
NO
A00
B00
4415D67620
4415D67120
3518606200
7121403011
3963512310
3512517000
3511800300
3518002400
3516004000
7S422X4081
3513003200
3518302200
3518400900
3518401000
PART CODE
3511714420
3511714450
3516720620
3516720640
3510805000
7112401011
3516109000
3516109600
7112401011
7122401211
7122401211
7112401011
35113AEQ0D
7112401011
7122401211
PART NAME
DOOR AS
DOOR AS
CONTROL-PANEL AS
CONTROL-PANEL AS
CABINET
SCREW TAPPING
CAVITY WELD AS
CAVITY JOINT AS
SCREW TAPPING
SCREW TAPPING
SCREW TAPPING
SCREW TAPPING
CORD POWER AS
SCREW TAPPING
SCREW TAPPING
FUSE
FUSE
NOISE-FILTER
SCREW TAPPING
MOTOR SHADED POLE
GUIDE WIND
FAN
MAGNETRON
SPECIAL SCREW
SCREW SPECIAL
HOLDER HV CAPACITOR
CAPACITOR HV
DIODE HV AS
DIODE HV AS
DESCRIPTION
KOR-63D59A
KOR-63F59A
KOR-63DB9S
KOR-63FB9S
SECC T0.5
T1 TRS 4*10 MFZN
CAVITY WELD AS
KOR-63150S
T1 TRS 4*10 MFZN
T2S TRS 4*12 MFZN
T2S TRS 4*12 MFZN
T1 TRS 4*10 MFZN
3X0.75 70X70 100-RTML
T1 TRS 4*10 MFZN
T2S TRS 4*12 MFZN
250V 12A 65TS
250V 12A MDA
DWLF-M12
T2S PAN 4X30 MFZN
230V 20W MW10CA-M02
PP
PP+30%GLASS
2M218J(F)
T2 BOLT FLANGE 5X12 DACRO
TT2 TRS 4X8 SE MFZN
SECC T0.6
2100VAC 0.98µF #187
HVR-1X-30B #187
ESJC13-12BX #187
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
2
1
1
1
1
1
3
1
1
1
Q'TY
1
1
1
31
✔ Caution:
In this Service 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)
NO
F23
F24
F29
F30
F31
F32
F25
F26
F27
F28
F33
F34
F35
F44
F45
F46
F47
F48
F49
F50
F40
F41
F42
F43
F36
F37
F38
F39
3518571000
3513601600
3512715000
7121400611
3966310100
3518905300
3513003400
3516003700
3511406220
3517400620
3514700710
3512517300
3517203600
7122401211
3518570400
PART CODE
3518701100
3518113751
3518113701
3516003700
3510311710
7112401011
3512100900
7S422X4081
3515201101
4415A17352
4415A66910
4415A17352
3513702600
3513811730
3513811700
PART NAME
FUSE HV
TRANS HV
TRANS HV
SPECIAL SCREW
BASE
SCREW TAPPING
FOOT
SCREW SPECIAL
STOPPER HINGE *U
SW MICRO
SW MICRO
SW MICRO
LEVER LOCK
LOCK
LOCK
SWITCH PUSH
LAMP
HARNESS MAIN
SCREW TAPPING
MOTOR SYNCRO
THERMOSTAT
HOLDER THERMOSTAT
SPECIAL SCREW
COVER WAVE GUIDE
COUPLER
ROLLER
GUIDE ROLLER
TRAY
SCREW TAPPING
SWITCH S/A RELAY
DESCRIPTION
5KV 0.55A HV-41A55-02
TM-N70S0-63T (KOR-63DB9S/63FB9S)
DY-N80S0-63T (KOR-63DB0S/63FB0S)
TT3 HEX 4X8 FLG MFZN
SECC T0.6
T1 TRS 4*10 MFZN
PP DASF-130
TT2 TRS 4X8 SE MFZN
SCP-1 T2.5
VP-533A-OF SPNO #187 200G
VP-531A-OF/SZM-V16-FA-61
VP-533A-OF SPNO #187 200G
POM
POM NATURAL (KOR-63DB)
POM BLACK (KOR-63FB)
MP101C
BL 240V 25W T25 C7A H187
KOR-631G0S
T2S PAN 4X6 MFZN
220V 2.5W GM-16-24FD12
OFF:75 ON:65 H #187 NB
PBT
TT3 HEX 4X8 FLG MFZN
PP J640A
XAREC
TEFLON
PP 5113MF6 A353B
GLASS
T2S TRS 4*12 MFZN
DWSR-1
1
1
1
3
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
5
2
4
1
Q'TY
1
1
1
32
S/M NO. : R63DB9S002
DAEWOO ELECTRONICS CO., LTD.
686, AHYEON-DONG MAPO-GU SEOUL, KOREA
C.P.O. BOX 8003 SEOUL, KOREA
TELEX: DWELEC K28177-8
CABLE: “DAEWOOELEC”
PRINTED DATE: Jul. 2001
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Table of contents
- 3 SAFETY AND PRECAUTIONS
- 3 1. FOR SAFE OPERATION
- 3 2. FOR SAFE SERVICE PROCEDURES
- 4 SPECIFICATIONS
- 5 EXTERNAL VIEW
- 5 1. OUTER DIMENSION
- 6 2. FEATURE DIAGRAM
- 7 3. CONTROL PANEL
- 8 INSTALLATION
- 9 OPERATIONS AND FUNCTIONS
- 10 DISASSEMBLY AND ASSEMBLY
- 17 INTERLOCK MECHANISM AND ADJUSTMENT
- 18 TROUBLE SHOOTING GUIDE
- 22 MEASUREMENT AND TEST
- 22 1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT
- 23 2. MICROWAVE RADIATION TEST
- 24 3. COMPONENT TEST PROCEDURE
- 25 WIRING DIAGRAM
- 26 PRINTED CIRCUIT BOARD
- 26 1. CIRCUIT CHECK PROCEDURE
- 29 2. PCB CIRCUIT DIAGRAM
- 30 3. P.C.B. LOCATION NO
- 31 EXPLODED VIEW AND PARTS LIST
- 31 1. DOOR ASSEMBLY
- 31 2. CONTROL PANEL ASSEMBLY
- 31 3. TOTAL ASSEMBLY