Service Manual
Microwave Oven
Model : KOC-1B0K0S
http : //svc.dwe.co.kr Nov. 2000
DAEWOO ELECTRONICS CO., LTD.
S/M No. : C1B0K0S002
✔
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).
1
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.
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
1. SAFETY AND PRECAUTIONS -------------------------------------------------------------------- 2
2. SPECIFICATIONS -------------------------------------------------------------------------------------3
3. EXTERNAL VIEW -------------------------------------------------------------------------------------3
3-1. OUTER DIMENSION ---------------------------------------------------------------------------3
3-2. FEATURE DIAGRAM --------------------------------------------------------------------------4
4. INSTALLATION ---------------------------------------------------------------------------------------5
5. CONTROL PANEL -----------------------------------------------------------------------------6
6. DISASSEMBLY AND ASSEMBLY -----------------------------------------------------------------7
7. INTERLOCK MECHANISM AND ADJUSTMENT------------------------------------------------17
8. TROUBLE SHOOTING GUIDE ----------------------------------------------------------------18
9. MEASUREMENT AND TEST ------------------------------------------------------------------------- 23
9-1. MEASUREMENT OF THE MICROWAVE OUTPUT-----------------------------------23
9-2. MICROWAVE RADIATION TEST --------------------------------------------------------24
9-3. COMPONENT TEST PROCEDURE ------------------------------------------------------25
9-4. COMPONENT ACTION ---------------------------------------------------------------------26
10. WIRING DIAGRAM ---------------------------------------------------------------------------------27
11. EXPLODED VIEW AND PARTS LIST ---------------------------------------------------------28
11-1. DOOR ASSEMBLY------------------------------------------------------------------------------28
11-2. CONTROL PANEL ASSEMBLY--------------------------------------------------------------28
11-3. TOTAL ASSEMBLY-----------------------------------------------------------------------------28
12. PRINTED CIRCUIT BOARD --------------------------------------------------------------------------32
13. P.C.B. CIRCUIT DIAGRAM ------------------------------------------------------------------------------36
2
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 micro-
wave 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 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’ or by earth symbol or 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.
3
2. SPECIFICATIONS
MODEL KOC-1B0K
POWER SUPPLY 230V~50Hz, SINGLE PHASE WITH EARTHING
MICROWAVE 1500W
GRILL 1600W
CONVECTION 2300W
POWER
CONSUMPTION
COMBINATION 3100W
MICROWAVE ENERGY OUTPUT 1000W (IEC705)
MICROWAVE FREQUENCY 2450MHz
OUTSIDE DIMENSIONS (W X H X D) 560 x 344 x 542 mm (22.0 x 13.5 x 21.3 in.)
CAVITY DIMENSIONS (W X H X D) 368.5 x 246 x 376.5 mm (14.5 x 9.7 x 14.8 in.)
NET WEIGHT APPROX. 21.5 Kg ( 47.6 lbs.)
TIMER 60 minutes
FUNCTION SELECTIONS MICROWAVE/ GRILL/ CONVECTION/ COMBINATION
POWER SELECTIONS 10 LEVELS
CAVITY VOLUME 1.2 Cu.Ft.
l SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.
3. EXTERNAL VIEW
3-1. OUTER DIMENSION
Fig. 1 Front view
Fig. 2 Side view
4
3-2. FEATURE DIAGRAM
1. Door hook – When the door is closed, it will automatically shut. If the door is opened while
the oven is operating, the magnetron will immediately stop operating.
2. Door viewing screen – Allows viewing of food. The screen is designed so that light can
pass through, but not the microwave.
3. Metal rack
4. Top heater – Turns on when convection, grill and combi cooking is selected.
5. Oven lamp – Automatically turns on during oven operating.
6. Safety interlock system
7. Control panel
8. Turntable tray – Rotates during cooking and ensure even distribution of Microwaves.
It can also be used as a cooking utensil.
9. Roller guide – This must always be used for cooking together with the turntable tray.
10. Coupler – This fits over the shaft in the center of the ovens cavity floor. This is to remain in
the oven for all cooking.
11. Convection outlet & fan
12. Under heater
13. Oven front plate
14. Door seal – Door seal maintains the microwave energy within the oven cavity and prevents
microwave leakage.
5
4. 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 12(8)amperes, 230 Volts, 50 Hz.
• Power supply cord is about 1.2 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.
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.
EARTHING INSTRUCTIONS
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.
6
5. CONTROL PANEL
DISPLAY WINDOW
1. MICROWAVE indicator, showing
microwaving in progress.
2. DEFROST indicator, showing
defrosting in progress.
3. GRILL(upper grill heater) indicator,
showing grilling in progress.
4. GRILL(lower grill heater) indicator,
showing grilling in progress.
5. CONVECTION indicator, showing
convectioning in progress.
6. CHILD LOCK indicator.
7. % percentage microwave power
level indicator.
BUTTONS
8. language : Press to select the
language.
9. clock : Use to set clock.
10. less : Use to remove time
from cooking.
11. more : Use to add time to
cooking.
12. m/w : Press to select microwave
power level.
13. combi : Press to select combi
cooking mode.
14. auto defrost : Press to select
defrost menu.
15. convection : Press to select
convection temperature.
16. grill : Press to select grill.
17. cake : Press to select cake menu.
18. crusty : Press to select crusty menu.
19. auto cook : Press to select
auto cook menu.
20. memory : Use to set favorite
cooking mode.
21. start/speedy cook : Press to start
a programme, also for speedy start
(each press adds 30 seconds
microwave cooking time).
22. stop/clear : Press once to stop
a programme, and twice to cancel
a programme.
23. dial knob : Use to set time, weight
and quantity.
clock
memory
cake
m
w
/
clear
stop/
start/
speedy cook
auto cook
crusty
more
c
g
less
auto
defrost
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language
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6. DISASSEMBLY AND ASSEMBLY
- Cautions to be observed when trouble shooting.
Unlike many other appliances, the microwave oven is high-voltage, high-current equipment.
It is completely safety during normal operation. However, carelessness in servicing the oven
can result in an electric shock or possible danger from a short circuit.
You are asked to observe the following precautions carefully.
1. Always remove the power plug from the outlet before servicing.
2. Use an insulated screwdriver and ware rubber gloves when servicing the high voltage side.
3. Discharge the high voltage capacitor before touching any oven components or wiring.
1) Check the 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
makes sure it is earthed properly before beg-
inning repair work.
2) Warning about the electric charge in the high
voltage capacitor.
For about 30 seconds after the operation sto-
pped 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 screw-
driver 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.
8
A01
1. To remove cabinet
(1) Remove four 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 assembly.
3. To remove door parts.
REF.NO PART CODE PART NAME DESCRIPTION Q’ TY REMARK
A01 3512204700 FRAME DOOR PC 1
A02 3517006900 BARRIER-SCREEN*O TEMP GLASS T3.2 1
A03 7112401011 SCREW TAPPING T1 TRS 4x10 MFZN 2
A04 3515204900 STOPPER HINGE *T AS KOC-1B0K0S 1
A05 3512302300 GASKET DOOR PBT 1
A06 7122401211 SCREW TAPPING T2S TRS 4x12 MFZN 1
A07 3513101200 HOOK POM 1
A08 3515101800 SPRING HOOK PW1 1
A09 3511714100 DOOR SEAL AS KOC-1B0K0S 1
A10 3512603500 HANDLE DOOR PC 1
NOTE : After replacing the door assembly,
perform a check of correct alignment with
the hinge and cavity front plate.
A02
A03
A04
A05
A06
A07
A08
A09
A10
✔ 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)
9
(1) Remove the gasket door from door plate.
(2) Remove a screw from door plate.
(3) Remove the door frame from door plate.
(4) Remove the stopper hinge top from door plate.
(5) Remove the spring and the hook.
(6) Remove two screws from door frame.
(7) Remove the handle door and barrier screen outer from door frame.
(8) Remove the barrier screen outer from handle door.
(9) 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’ .
1) Loosen two screws on stopper hinge top, and then
push the door to contact the door seal to oven front surface.
2) Tighten two screws.
(2) To reduce gap located on part ‘ B’ .
1) Loosen two screws on stopper hinge under, and then
push the door to contact the door seal to oven front
surface.
2) Tighten two screws.
NOTE : A small gap may be acceptable if the microwave leakage does not exceed 4mW
does not exceed 4mW/cm
2
.
10
5. To remove control panel parts.
REF.NO PART CODE PART NAME DESCRIPTION Q’ TY REMARK
B01 3511605000 DECORATOR C-PANEL ABS XR-401 H-2938 1
B02 3511605100 DECORATOR RING ABS SG-175 SG-0760D 1
B03 3515501700 WINDOW DISPLAY PMMA 1
B04 3516724100 CONTROL PANEL ABS XR-401 H-2938 1
B05 3516908300 BUTTON FUNCTION-A ABS SG-175 SG-0760D 1
B06 3516908500 BUTTON FUNCTION-C ABS SG-175 SG-0760D 1
B07 3516908400 BUTTON FUNCTION-B ABS SG-175 SG-0760D 1
B08 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 3
B09 3514323010 PCB MAIN AS KOC-1B0K0S 1
B10 7121301011 SCREW TAPPING TS2 PAN 3X10 MFZN 7
B11 3514323110 PCB SUB AS KOC-1B0K0S 1
B12 3516908600 BUTTON FUNCTION-D ABS SG-175 SG-0760D 1
B13 3516908700 BUTTON FUNCTION-E ABS SG-175 SG-0760D 1
B14 3516908200 BUTTON START ABS SG-175 SG-0760D 1
B15 3513406000 KNOB VOLUME ABS SG-175 SG-0760D 1
6. Remove the screw which secure the control panel, push up two snap fits and draw
forward the control panel assembly.
6. Remove three screws (B08) which secure the control panel.
6. Pull out the Main pcb assembly(B09).
6. Remove seven screws(B10) which secure the control panel.
6. Pull out the Sub pcb assembly(B11).
(6) Pull out the Knob volume(B15) from the Sub pcb assembly.
(7) Pull out six buttons from the control panel.
(8) Pull out Decorator ring(B02) and Window display(B03) from the control panel .
(9) Pull out the Decorator c-panel(B01) from the control panel.
(10) Reverse the above steps for reassembly.
✔ 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)
11
6. To remove high voltage capacitor.
(1) Remove a screw which secure the groun-
ding 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.
l 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.
CAUTION : 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.
Magnetron antenna
Metallic
gasket
plate
Cooling fin
Filament
terminal
12
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.
13
10. To remove Lamp assembly parts.
REF.NO PART CODE PART NAME DESCRIPTION Q’ TY REMARK
1 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 1
2 3512520500 GUIDE AIR OUTLET SA1D T0.5 1
3 3513302800 INSULATOR HEATER *T SBHG T0.6 1
4 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 2
5 3511407800 COVER LAMP STS430 T0.5 1
6 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 2
7 3513003900 HOLDER LAMP AS KOC-1B0K0S 1
8 3513602600 LAMP HALOGEN 2
9 3511407810 COVER LAMP GLASS T2.0 1
(1) Remove a screw and pull out Guideair outle .
(2) Remove two screws and pull out Insulator heater *t .
(3) Pull out the Lamp assembly.
(4) Remove two screws pull out the Lamp assembly.
(5) Pull out the Holder lamp assembly from the Cover lamp .
(6) Pull out the Lamp from the Holder lamp assembly .
(7) Reverse the above steps for reassembly.
1
2
3
4
6
7
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5
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1
4
6
7
8
2
3
5
7
✔ 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)
14
11. To remove Top heater assembly parts.
REF.NO PART CODE PART NAME DESCRIPTION Q’ TY REMARK
1 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 1
2 3512520500 GUIDE AIR OUTLET SA1D T0.5 1
3 3513302800 INSULATOR HEATER *T SBHG T0.6 1
4 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 2
5 3512767000 HARNESS HEATER KOC-1B0K0S 1
6 3510607700 BRACKET HEATER *T SA1D T0.5 1
7 3512803800 HEATER MIRACLON 115V 550W 270MM 2
8 3511407600 COVER HEATER *T STS430 T0.5 1
(1) Remove a screw and pull out Guide air outlet .
(2) Remove two screws and pull out Insulator heater *t .
(3) Pull out the Top heater assembly.
(4) Pull out the Harness heater .
(5) Pull out the Bracket heater *t from the Cover heater *t .
(6) Pull out the Heater miraclon from the Cover heater *t .
(7) Reverse the above steps for reassembly.
1
2
3
4
6
7
8
5
1
4
5
6
7
8
8
2
3
✔ 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)
15
12. To remove Rear heater assembly parts.
REF.NO PART CODE PART NAME DESCRIPTION
Q’ T
Y
REMARK
1 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 1
2 3511407300 COVER MOTOR *B SBHG T0.6 1
3 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 2
4 3511407400 COVER *B SBHG T0.6 1
5 3512766900 HARNESS CONVECTION-B KOC-1B0K0S 1
6 3512803800 HEATER MIRACLON 115V 550W 270MM 2
7 3511407700 COVER HEATER *B SA1D T0.5 1
8 7113400814 SCREW TAPPING T1 BIN 4X8 MFNI 3
9 7400104011 WASHER PLAIN PW-1-4 MFNI 1
10 3511800700 FAN CONVECTION SA1D T0.5 1
11 7S627W50X1 NUT HEX NUT FLANGE M5X0.8P MFZN 1
12 3512766800 HARNESS CONVECTION-A KOC-1B0K0S 1
13 7601400811 SCREW MACHINE PAN 4X8 PW MFZN 2
14 3513302900 INSULATOR HEATER *B SA1D T0.5 1
15 7113400814 SCREW TAPPING T1 BIN 4X8 MFNI 4
16 3963514300 MOTOR SHADED POLE 230V 50Hz MW10CA-T02 1
17 3511800800 FAN PP GF20 1
18 7402704600 RING-C CR-5 SK5 1
(1) Remove a screw and then pull out Cover motor *b .
(2) Remove two screws and thenpull out Cover *b .
(3) Pull out the Harness convection-b .
(4) Remove four screws and then pull out the Rear heater assembly.
(5) Remove a Nut and then pull out the Fan convection and Washer plain .
(6) Remove three screws and then separate the Cover heater *b and the Insulator heater *b .
(7) Pull out two Heaters from the the Insulator heater *b .
(8) Remove two screws and then separate the Insulator heater *b and Motor shaded pole
(9) Remove the Ring-c and then pull out the Fan from Motor shaft.
(10) Reverse the above steps for reassembly.
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2
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11 10
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8 7 6
5
3
4
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3
5
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4
10
9
8
7
14
16
14
17
14
6
13
18
✔ 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)
16
13. To remove Motor synchro. And Under heater assembly parts.
REF.NO PART CODE PART NAME DESCRIPTION Q’ TY REMARK
1 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 1
2 3511407500 COVER HEATER *U STS430 T0.5 1
3 3515304000 SUPPORTER HEATER *U STS430 T0.5 1
4 3512802000 HEATER *U 230V 400W R18374001 1
5 7113400814 SCREW TAPPING T1 BIN 4X8 MFZN 1
(1) Cut the Motor synchro. Cover parts from the base plate.
(2) Remove a screw and then pull out Motor synchro.
(3) Remove a screw and then pull out the Under heater *u assembly .
(4) Remove a screw .
(5) Pull out the Heater *u from the Cover heater *u .
(6) Reverse the above steps for reassembly.
CUTTING (6EA)
1
2
3
4
5
1
5
4 2
✔ 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)
17
7. 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
losed, the hook pushes the lock
lever downward. The lock lever
presses 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 “OFF” 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 opened before other switches
are closed.
When the door is opened, the interlock monitor switch should be closed after other switches
are opened.
(3) Adjustment steps
(a) Loosen the one mounting screws.
(b) Adjust interlock switch assembly position.
(c) Make sure that lock lever moves smoothly after adjustment is completed.
(d) Tighten completely one mounting screws.
NOTE : Microwave emission test should be performed after adjusting interlock mechanism.
If the microwave emission exceed 4mW/cm
2
, readjust interlock mechanism.
18
8. TROUBLE SHOOTING GUIDE
Following the procedures below to check if the oven is defective or not.
1. Check grounding before checking trouble.
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 then check continuity with the AC plug removed. To do
otherwise may result in a false reading or damage to your meter.
TROUBLE 1) Oven does not operate at all; inputs can not be accepted.
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 parts
listed below.
CONDITION CHECK RESULT CAUSE REMEDY
Fuse blows
Check continuity of
interlock monitor switch
with door closed
( COM NC )
Continuity Malfunction
Of Interlock
monitor switch
Replace
Check continuity of
both primary and
secondary interlock
switch with door closed
No
Continuity
Malfunction
Of interlock
switch
Check continuity of
Primary winding of low
voltage transformer
Shorted contacts
of Primary
Interlock switch
Defective
Low voltage
transformer
Replace
Replace
Replace
No continuity
(COM
NC)
Check continuity of
primary interlock switch
contact with door partially
open until
interlock monitor
switch contact close
( COM NC close )
Replace
Defective
high voltage
transformer
Continuity
Continuity
0
-
or infinite
Approx.
530
( normal )
Disconnect high voltage
Fuse and operate the unit
Fuse again
blows
19
.
Outlet has
Proper
voltage
Fuse does
not blow?
Check continuity of
magnetron
Defective
magnetron.
CONDITION RESULT REMEDY
Check continuity of
noise filter board
Check continuity of
Power supply cord
Defective
Noise filter
board
Open power
supply cord
Defective
touch control
Circuit
Replace
Replace
Adjust
Adjust
NOTE : All these switches must be replaced at the same time, please refer to (7.Interlock
mechanism and Adjust) for adjustment instructions
TROUBLE 2) Grill heater (top heater) is not heated; food will not become hot.
CONDITION CHECK RESULT CAUSE REMEDY
Grill heater is
Not heated.
Check continuity of
Primary interlock switch
No
Continuity
Malfunction
Of primary
Interlock switch
Adjust or
Replace
Check continuity of
secondary interlock
switch
No
Continuity
Malfunctioon
Of secondary
interlock switch
Adjust or
replace
Check continuity of
heater
No
continuity
Check D.C voltage
Being supplied to
RELAY (RY2) coil
Defective
heater
0V
Approx
24V DC
Defective
Touch control
circuit
Faulty contacts
of RELAY
(RY2) or open
relay coil
Replace
Replace
Replace
CHECK CAUSE
No
Continuity
No
Continuity
No
Continuity
Continuity
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