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S/M No. : G6C6R5S001
Service Manual
Microwave Oven
Model: KOG-6C6R5S
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 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
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.............................................................................................................18
TROUBLESHOOTING GUIDE .........................................................................................................................................19
MEASUREMENT AND TEST ............................................................................................................................................23
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ........................................................................23
2. MICROWAVE RADIATION TEST ...................................................................................................................24
3. COMPONENT TEST PROCEDURE ...............................................................................................................25
WIRING DIAGRAM............................................................................................................................................................26
PRINTED CIRCUIT BOARD..............................................................................................................................................27
1. CIRCUIT CHECK PROCEDURE ....................................................................................................................27
2. PCB CIRCUIT DIAGRAM................................................................................................................................30
3. P.C.B. LOCATION NO ....................................................................................................................................31
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 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 : Earth
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 :
The oven is designed for counter-top use only.
2
2
SPECIFICATIONS
POWER SUPPLY 230V~50Hz, SINGLE PHASE WITH EARTHING
MICROWAVE 1200 W
POWER
GRILL 1050 W
CONSUMPTION
COMBINATION 2200 W
MICROWAVE ENERGY OUTPUT 800W
MICROWAVE FREQUENCY 2450MHz
OUTSIDE DIMENSIONS (WXHXD) 465X279X384mm
CAVITY DIMENSIONS (WXHXD) 290X220X306mm
NET WEIGHT APPROX. 13.7Kg
TIMER 60 min. 00 sec.
POWER SELECTIONS 5 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
1 2 3 4 5
6
q 09 8 7
1 Door seal - Door seal maintains the microwave energy 8 Roller guide - This must always be used for cooking
within the oven cavity and prevents microwave together with the glass cooking tray.
leakage.
9 Glass cooking tray - Made of special heat resistant
2 Reflector (Insulator Heater) glass. Food in a proper receptacle is placed on this tray
for cooking.
3 Heating Element
0 Door viewing screen - Allows viewing of food. The
4 Oven cavity screen is designed so that light can pass through, but
not the microwave.
5 Safety interlock system
q Door hook - When the door is closed, it will
6 Metal Rack automatically shut off. If the door is opened while the
oven is operating, the magnetron will immediately stop
7 Coupler - This fits over the shaft in the center of the operating.
ovens cavity floor. This is to remain in the oven for all
cooking.
5
3. CONTROL PANEL
1
2
3
4
5
8 6
7
1 Display - Cooking time, power level, indicators and 5 Clock - Used to set clock.
present time are displayed.
6 Start/Express cook - Used to start the oven
2 Auto cook - Used to cook using a program or to operation and also increase the reheat time by 30
reheat. seconds.
3 MICRO/Def. - Used to set power level. Used to 7 Dial knob - Used to set the time and weight.
defrost foods by weight or time.
8 Stop/Clear - Used to stop the oven operation or to
4 Grill/Combi - Used to cook grill/combi. erase all entries.
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.
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, 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 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 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. 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. The oven door can be opened at any time during operation by pulling the door handle.
The oven will automatically shut off. To restart the oven, close the door and then press START button.
5. Each time a button is pressed, a BEEP will sound to acknowledge the press.
6. The oven automatically cook on full power unless set to a lower power level.
7. The display will show : 0 when the oven is plugged in.
8. Time clock returns to the present time when the cooking time ends.
9. When the STOP/CLEAR button is pressed during the oven operation, the oven stops cooking and all information
is retained.
To erase all information (except the present time), press the STOP/CLEAR button once more. If the oven door is opened
during the oven operation, all information is retained.
10. If the START button is pressed and the oven does not operate, check the area between the door 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.
11. 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 complete in setting
time.
Never touch the oven window and metal interior of the oven when taking food in and out, because of 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.
Make sure the oven is properly installed and plugged into the electrical outlet.
Wattage output chart
The power level is set by pressing the M/W button. The chart shows the display, the power level and the percentage of
power.
Press 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 troubleshooting.
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 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.
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.
9
1. To remove cabinet
1) Remove three screws on cabinet back.
2) Pull the cabinet backward.
2. To remove door assembly
1) Remove a screw 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.
DOOR ASSEMBLY : 3511723730
REF NO. PART CODE PART NAME DESCRIPTION Q'TY REMARK
A01 3512206450 FRAME DOOR ABS SG-175 SG-0760D 1
A02 3517008800 BARRIER-SCREEN *O SAN CR-5381 SMOG 1
A03 3515204100 STOPPER HINGE *T AS KOR-63150S 1
A04 3511706120 DOOR PAINTING AS KOR-634R0S 1
A05 3517002800 BARRIER-SCREEN *I POLYESTER T0.1 1
A06 3512300210 GASKET DOOR PP 1
A07 3513100700 HOOK POM 1
A08 3515101320 SPRING HOOK HSW-3 1
A09 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 2
A10 3512605110 HANDLE DOOR ABS SG-175 SG-0760D SPRAY 1
(1) Remove the gasket door from door weld as.
(2) Remove the gasket door from door weld as.
(3) Remove the door frame from door weld as.
(4) Remove the stopper hinge top from door weld as.
(5) Remove the spring and the hook.
(6) Remove the barrier screen outer from door frame.
(7) Reverse the handle from door frame.
(8) Reverse the above steps for reassembly.
11
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 screw on stopper hinge top,
and then push the door to contact the door
seal to oven front surface.
Tighten a screw.
(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/cm2.
12
5. To remove control panel parts.
C/PANEL ASSEMBLY : PKCPSWAZ30
REF NO. PART CODE PART NAME DESCRIPTION Q'TY REMARK
B01 3513408010 KNOB VOLUME ABS SG-175 SG-0760D COATING 1
B02 3511613210 DECORATOR RING ABS SG-175 SG-0760D COATING 1
B03 3515502200 WINDOW DISPLAY SAN CR-5381 SMOG 1
B04 3516731310 CONTROL-PANEL HIPS SG-970 HG-1760H 1
B05 3516912510 BUTTON FUNCTION-A ABS SG-175 SG-0760D COATING 1
B06 PKBPMSAZ00 PCB BUTTON MANUAL AS KOR-6C6R5S 1
B07 PKMPMSAZ30 PCB MAIN MANUAL AS KOG-6C6R5S 1
B08 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 4
B09 7621301011 SCREW TAPPING T2 PAN 3X10 PW MFZN 3
B10 3516912610 BUTTON FUNCTION-B ABS SG-175 SG-0760D COATING 1
1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly.
2) Remove screws which secure the PCB assembly to control panel.
3) Disconnect wire flat from the connector of the PCB assembly.
4) Remove the PCB from the control panel.
5) Remove the function buttons knob, window display and decorator ring from the control panel.
6) 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 pre-
vent microwave leakage. Whenever repair work is carried out on magnetron, check the microwave leakage. It shall
not exceed 4mW/cm2 for a fully assembled oven with door normally closed.
14
8. To remove wind guide assembly.
1) Remove a screw which secure the wind guide assembly.
2) Draw forward the wind guide assembly.
3) Pull the fan from the motor shaft.
4) Remove two screws which secure the motor shaded pole.
5) Remove the motor shaded pole.
6) 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
10. To remove tray motor.
1) Remove the coupler in the cavity.
2) Turn the set upside down.
3) Cut the tray motor cover part from the base plate.
4) Remove the tray motor cover.
5) Remove a screw which secure the tray motor.
6) Remove the tray motor.
7) Reverse the above steps for reassembly except for
securing the tray motor cover with screw.
11. To remove heater assembly.
1) Remove the three nuts.
2) Remove the insulator heater assembly.
3) Reverse the above steps for reassembly.
16
12. To remove heater parts.
REF NO. PART CODE PART NAME DESCRIPTION Q'TY REMARK
C01 7392500008 NUT HEX 6N-2-5 SUS 1
C02 3515000600 SPACER INSULATOR *I C3771BD 1
C03 3513301100 INSULATOR HEATER SPP T0.8 1
C04 3512803400 HEATER 230V 1000W 1R67994001 1
C05 7002500613 SCREW MACHINE TRS 5X6 MFCR 1
C06 7002400413 SCREW MACHINE TRS 4X4 MFCR 1
17
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.
Condition : DOOR CLOSED Condition : DOOR OPEN
(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 one mounting screw.
b) Adjust interlock switch assembly position.
c) Make sure that lock lever moves smoothly after adjustment is completed.
d) Tighten completely one mounting screw.
NOTE :
Microwave emission test should be performed after adjusting interlock mechanism. If the microwave emission exceed
4mW/cm2, readjust interlock mechanism.
18
16
TROUBLESHOOTING 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 Check Result Cause Remedy
Fuse blows Check continuity of inter- Malfunction of Replace
lock monitor switch Continuity interlock NOTE
with door closed monitor switch
(COM NC)
No
Continuity
Check continuity of pri- No Shorted contacts Replace
mary interlock switch con- Continuity of primary interlock NOTE
tact with door partially switch
open until interlock moni-
tor switch contact close Continuity
Check continuity of pri- Continuity Shorted contacts of Replace
mary interlock switch con- primary interlock NOTE
tact with door partially switch.
open until interlock moni-
tor switch contact close
(COM NO)
Check continuity of 0 or Defective low volt- Replace
primary winding of low infinite age transformer
voltage transformer
Approx.
150~310
(normal)
Disconnect high voltage Fuse again Defective high Replace
fuse and operate the unit blows voltage transformer
19
17
Condition Check Result Cause Remedy
Outlet has Check continuity of No Defective magnetron
Replace
proper voltage. magnetron Continuity
Fuse does not
blow.
Check continuity of No Defective line filter
Replace
noise filter board Continuity board
Check continuity of No Open power supply
Replace
power supply cord Continuity cord
Normal Defective touch con-
Replace
trol circuit
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 pressed.
Condition Check Result Cause Remedy
Turn table Check continuity of No Malfunction of primary Adjust or
motor, and primary interlock Continuity interlock switch Replace
oven lamp do switch
not turn on
Check continuity of No Malfunction of sec- Adjust or
secondary interlock Continuity ondary interlock and Replace
and D.O.M. switchs D.O.M switch
Check D.C. voltage Defective touch con-
0V Replace
being supplied to trol circuit
RELAY (RY2) coil
Approx Faulty contacts of
Replace
15 VDC RELAY (RY2) or open
relay coil
20
18
(TROUBLE 3) No microwave oscillation even though fan motor rotates.
Condition Check Result Cause Remedy
No Check continuity Continuity Defective high Replace
microwave of high voltage voltage
oscillation capacitor transformer
terminals with
wires removed
Check continuity of Continuity in Defective high Replace
high voltage diode backward voltage diode
in forward and diode
backward direction
with DC megger
Connect megger Continuity Defective Replace
leads to magnetron
magnetron
terminal and
magnetron body
Check resistance Defective high Replace
of primary and voltage
secondary coil of transformer
high voltage
transformer
Check continuity No Defective Replace
of magnetron Continuity magnetron
with wires
removed
Check continuity No Defective high Replace
of filament Continuity voltage
terminal of high transformer
voltage
transformer
Check D.C. 0V Defective touch Replace
voltage being control circuit
supplied to
RELAY (RY1)
coil
Approx Faulty contacts of Replace
15 VDC RELAY (RY1) or
open relay coil
21
19
(TROUBLE 4) The following visual conditions indicate a probable defective touch control circuit assembly.
1. Incomplete segments
(1) Segments missing
(2) Partial segments missing
(3) Digit flickering other than normal display slight flickering
(4) :0 does not display when power is on.
2. Distinct changes in the display are not on when they should be.
3. One or more digits in the display are not on when they should be.
4. Display indicates a number different from one pressed.
5. Specific numbers (for example 2 or 3) will not display when the panel
is pressed.
M/W DEF. Grill Combi g
6. Display does not count down or up with time cooking or clock opera-
tion.
7. Oven is programable and cooks normally but no display shows.
8. Display obviously jumps in time while counting down.
9. Display counts down noticeably too fast while cooking.
10. Display does not show the time of day when STOP/CLEAR button is pressed.
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 Check Result Cause Remedy
Display does Check each button Normal Malfunction Replace the P.C.B
not show for continuity of the of the P.C.B main-assembly
programming P.C.B sub-assembly main-assembly
at all, even it for the following
button is button check
pressed. procedure
Abnormal Malfunction of Replace the P.C.B
the P.C.B sub-assembly
sub-assembly
NOTE : Before following the particular steps listed above in the troubleshooting guide for the button of control
panel failure, please check for the continuity of each wire-harness between the P.C.B main-assembly and
P.C.B. sub-assembly.
22
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 approxi-
mately 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.
t 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) 70 64 60 56 52 49 47 44 42 40 38
B(W) 600 650 700 750 800 850 900 950 1000 1050 1100
23
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/cm2.
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.
24
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 (at 20 C):
Secondary winding ...................Approx. 170 10%
Filament winding....................................Approx. 0
Primary winding..........................Approx. 2.5 10%
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 once the capacitor is charged.
(3) A shorted capacitor will show continuous continuity.
(4) An open capacitor will show constant 10M .
(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, oth-
erwise an infinite resistance may be read in both directions.
A normal diode s resistance will be infinite in one direction and several hundred K 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 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.
25
23
WIRING DIAGRAM
26
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 LOAD NO LOAD
4-7 DC 12 V AC 29.5 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 CHECK POINT REMARK
1 IC 1 PIN 40, 18 5 VDC
2 IC 1 PIN 29
5V
0V T:20ms(50Hz)
T
3 IC 1 PIN 15 OR 16
5V
0V T T: 250 ns (4MHz)
Check method
NO MEASURE POINT WAVE FORM REMEDY REMARK
1 MP1 DC 5V 0.25V Replace VL1, EC1 NO LOAD
2 MP2 DC 12V 2.0V Replace EC2, D9, D10 NO LOAD
NOTE :
Each measure point must be measured with GND points.
27
25
MP1
MP2
Measure Point
28
3. When there is no microwave oscillation
1) When pressing START button, 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 B
RELAY 2 ON 5VDC GND
RELAY 2 OFF GND 12VDC
2) When pressing START button, 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 B
RELAY 1 ON 5VDC GND
RELAY 1 OFF GND 12VDC
4. When there is no grill oscillation.
* Cause : RELAY 3 does not operate. refer to Circuit Diagram (Point 6)
- Check method
POINT
STATE A B
RELAY 3 ON 5VDC GND
RELAY 3 OFF GND 12VDC
5. When the door is opened during operation, the count down timer does not stop.
refer to Circuit Diagram (Point 1)
-Check method
POINT A B
STATE
1) DOOR OPEN OPEN 5VDC
2) DOOR CLOSED CLOSE GND
CHECK NO METHOD REMEDY
1 Check the stage (ON, OFF) of the door open monitor switch by Replace door open monitor
resistance measurement. switch.
6. When the digital clock does not operate properly.
refer to Circuit Diagram (Point 5)
POINT WAVE FORM
1 5V
0V T:20ms(50Hz)
T
* If clock does not keep exact time, you must check resistor R17, 18, transistor Q11
29
2. PCB CIRCUIT DIAGRAM
30
3. P.C.B. LOCATION NO.
NAME SYMBOL PART CODE SPECIFICATION Q'TY REMARK
1 BUZZER BZ1 3515600100 BM-20K 1
2 C ARRAY CA1 CN4XB-102M 5P(4) 102 M 50V 1
3 C CERA C1~3,5~8 CCZF1H104Z 50V HIKF 0.1uF Z 7
4 C ELECTRO EC1 CEXF1C101V 16V RSS 100uF 1
5 C ELECTRO EC2 CEXF1E102V 25V RSS 1000uF 1
6 CONN WAFER CN1 3519150520 YW396-02V 1
7 CONN FILM CN3 4CW215SBD0 HLEM15S-1 1
8 CONN WAFER CN4 3519150510 YW396-05AV 1
9 DIODE SWITCHING D1,D3~D8 DZN4148--- 1N4148 AUTO 52mm 7
10 DIODE RECTIFIER D9,D10 DZN4004A-- 1N4004A AUTO 52mm 2
11 DIODE ZENER ZD1 DZUZ3R3BSB UZ-3.3BSB 1
12 IC MICOM IC1 13GSG6C6R0 TMP87CH47U 1
13 IC REGULATOR VL1 1CPMC7805C MC7805C 1
14 LED DISPLAY DP1 DDDG631H-- ELF-496GWB 1
15 PCB MAIN M308 3514329900 BOARD(80x155) 1 MAIN PCB
16 R ARRAY RA1 RA-86X104J 6P(5) 1/8 100K OHM J 1
17 R CARBON FILM R8 RD-AZ101J- 1/6 100 OHM 5% 1
18 R CARBON FILM R1~R7 RD-AZ331J- 1/6 330 OHM 5% 7
19 R CARBON FILM R9,11,13,20 RD-AZ102J- 1/6 1K OHM 5% 4
20 R CARBON FILM R10,12,18 RD-AZ103J- 1/6 10K OHM 5% 3
21 R CARBON FILM R17 RD-AZ473J- 1/6 47K OHM 5% 1
22 R CARBON FILM R15 RD-AZ105J- 1/6 1M OHM 5% 1
23 R CARBON FILM R19 RD-4Z510J- 1/4 51 OHM 5% SMALL 1
24 RESONATOR CERA CR1 5P4R00MTS- CRT4.00MS 1
25 SW RELAY RY1,RY3 5SC0101121 G5G-1A 1C 1P DC12V 2
26 SW RELAY RY2 5SC0101128 CS11-12SH 1C 1P 1
27 TR Q1~Q5 TZRA106M-- KRA-106M (AUTO) 5
28 TR Q8~Q12 TZRC106M-- KRC-106M (AUTO) 5
29 TR Q6 TZTA1266Y- KTA-1266Y (AUTO) (1015Y) 1
30 TRANS POWER LVT1 5EPV035303 DMR-631FS 1
31 WIRE COPPER J1~3,14,15,SJ4,SJ5 85801052GY 1/0.52 TIN COATING 7.5mm 7
32 WIRE COPPER J4,7,8,12,13,16 85801052GY 1/0.52 TIN COATING 10mm 6
33 WIRE COPPER J9,10 85801052GY 1/0.52 TIN COATING 12.5mm 2
34 PCB SUB M309 3514330000 BOARD(72.6x93.4) 1 SUB PCB
35 CONN WAFER CN101 4CW215RBD0 HLEM15R-1 1
36 SW ROTARY SW101 5S10302005 EC12E24204A8 1
37 SW TACT SW102~SW107 5S50101Z93 KPT-1115AM 6
38 R CARBON FILM R101,R102 RD-AZ102J- 1/6 1K OHM 5% 2
39 R CARBON FILM R105,R106 RD-AZ103J- 1/6 10K OHM 5% 2
40 R CARBON FILM R103,R104 RD-AZ104J- 1/6 100K OHM 5% 2
41 WIRE COPPER SJ102,SJ104 85801052GY 1/0.52 TIN COATING 7.5mm 2
42 WIRE FLAT WF1 WSJ-159007 1.25X15X90XC 1
31
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
32
NO PART CODE PART NAME DESCRIPTION Q'TY
A00 3511723730 DOOR AS KOG-6C675S 1
B00 PKCPSWAZ30 CONTROL-PANEL AS KOG-6C6R5S 1
C00 3513302700 INSULATOR HEATER AS KOG-37150S 1
F01 3510805300 CABINET AS KOR-61150S 1
F02 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 3
F03 3516109500 CAVITY AS KOR-63150S 1
F04 7S627W50X1 NUT HEX NUT FLANGE M5X0.8P MFZN 2
F05 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 1
F06 3518904500 THERMOSTAT OFF:100 ON:90 HN #187 NB 1
F07 7121300611 SCREW TAPPING T2S PAN 3X6 MFZN 1
F08 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 1
F09 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 2
F10 35113A5QJ5 CORD POWER AS 3X1.5 80X80 120-RTML 1
F11 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 1
F12 7S627W50X1 NUT HEX NUT FLANGE M5X0.8P MFZN 2
F13 3518606100 NOISE FILTER DWLF-M13 1
F14 7121402511 SCREW TAPPING T2S PAN 4X25 MFZN 2
F15 3963512310 MOTOR SHADED POLE 230V 20W MW10CA-M02 1
F16 3512517000 GUIDE WIND PP 1
F17 3511800300 FAN PP+30%GLASS 1
F18 3518003700 MAGNETRON 2M218JFL 1
F19 3516004000 SPECIAL SCREW T2 BOLT FLANGE 5X12 DACRO 1
F20 7272400811 SCREW TAPTITE TT3 TRS 4*8 MFZN 1
F21 3513003200 HOLDER HV CAPACITOR SECC T0.6 1
F22 3518302200 CAPACITOR HV 2100VAC 0.98UF #187 1
F23 3518400900 DIODE HV AS HVR-1X-30B #187 1
F24 3518701100 FUSE HV 5KV 0.55A HV-41A55-02 1
F25 3518119880 TRANS HV R1S580(EA00) 1
F26 3516003700 SPECIAL SCREW TT3 HEX 4X8 FLG MFZN 4
F27 3510311700 BASE SBHG T0.7 1
F28 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 5
F29 3512100900 FOOT PP DASF-130 2
F30 7272400811 SCREW TAPTITE TT3 TRS 4X8 MFZN 1
F31 3515201101 STOPPER HINGE *U SCP-1 T2.5 1
F32 3512715500 HARNESS MAIN KOG-371G0S 1
F33 4415A17352 SW MICRO VP-533A-OF SPNO #187 200G 1
F34 4415A66910 SW MICRO VP-531A-OF/SZM-V16-FA-61 1
F35 4415A17352 SW MICRO VP-533A-OF SPNO #187 200G 1
F36 3518571000 SWITCH PUSH MP101C 1
F37 3513702610 LEVER LOCK POM 1
F38 3513811710 LOCK POM BLACK 1
F39 3513601600 LAMP BL 240V 25W T25 CC7A H187 1
F40 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 1
F41 3966310100 MOTOR SYNCRO 220V 2.5W GM-16-24FD12 1
F42 3518905300 THERMOSTAT OFF:75 ON:65 H #187 NB 1
F43 3513003410 HOLDER THERMOSTAT PP(BK) 1
F44 7272400811 SCREW TAPTITE TT3 TRS 4X8 MFZN 1
F45 4078502031 BUTTON LOCKING PP HONAM A353 2
F46 3511405100 COVER WAVE GUIDE MICA T0.35 1
F47 3517400620 COUPLER XAREC 1
F48 3514700710 ROLLER TEFLON 3
F49 3512517300 GUIDE ROLLER PP 5113MF6 A353B 1
F50 3517203600 TRAY BORO-SI GLASS 1
F51 3517206900 TRAY RACK AS KOG-37150S 110MM 1
33
DAEWOO ELECTRONICS CORP.
686, AHYEON-DONG MAPO-GU SEOUL, KOREA
C.P.O. BOX 8003 SEOUL, KOREA
TELEX: DWELEC K28177-8
CABLE: "DAEWOOELEC"
S/M NO. : G6C6R5S001 PRINTED DATE: Jan. 2004
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