S/M No. : C1B0K0S002
Service Manual
Microwave Oven
Model : KOC-1B0K0S
✔
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.
http : //svc.dwe.co.kr Nov. 2000
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
(a) Do not operate or allow the oven to be operated with the door open.
(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other
microwave source, and make repairs as necessary: (1) Interlock operation, (2) Proper door closing, (3) Seal
and sealing surfaces (arcing, wear, and other damage), (4) Damage to or loosening of hinges and latches,
(5) Evidence of dropping or abuse.
(c) Before turning on power to the microwave oven for any service test or inspection within the microwave
generating compartments, check the magnetron, wave guide or transmission line, and cavity for proper
alignment, integrity, and connections.
(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation
and transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual
before the oven is released to the owner.
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
1
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.
2
2. SPECIFICATIONS
MODEL KOC-1B0K
POWER SUPPLY 230V~50Hz, SINGLE PHASE WITH EARTHING
MICROWAVE 1500W
POWER
CONSUMPTION
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.
GRILL 1600W
CONVECTION 2300W
COMBINATION 3100W
3. EXTERNAL VIEW
3-1. OUTER DIMENSION
Fig. 1 Front view
Fig. 2 Side view
3
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.
4
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.
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.
5
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
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.
12
15
17
18
20
22
1
2
3
4
language
8
clock
9
c
o
n
m
v
/
e
cake
less
w
defrost
c
t
i
o
n
auto
crusty
more
c
o
m
r
g
auto cook
b
i
l
l
i
7
6
5
10
11
13
14
16
19
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
memory
h
g
i
t
e
q
w
u
e
m
i
t
n
t
i
t
y
convection temperature.
16. grill : Press to select grill.
17. cake : Press to select cake menu.
18. crusty : Press to select crusty menu.
23
19. auto cook : Press to select
auto cook menu.
20. memory : Use to set favorite
cooking mode.
21. start/speedy cook : Press to start
21
stop/
clear
start/
speedy cook
6
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.
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)
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.
NOTE : After replacing the door assembly,
perform a check of correct alignment with
the hinge and cavity front plate.
3. To remove door parts.
A04
A02
A03
REF.NO PART CODE PART NAME DESCRIPTION Q’ TY REMARK
A01 351220 4700 FRAME DOOR PC 1
A02 351700 6900 BARRIER-SCREEN*O TEMP GLASS T3.2 1
A03 7112401011 SCREW TAPPING T1 TRS 4x10 MFZN 2
A04 3515204 900 STOPPER HINGE *T AS KOC-1B0K0S 1
A05 351 2302300 GASKET DOOR PBT 1
A06 7122401211 SCREW TAPPING T2S TRS 4x12 MFZN 1
A07 3513101200 HOOK POM 1
A08 351 5101800 SPRING HOOK PW1 1
A09 3511714100 DOOR SEAL AS KOC-1B0K0S 1
A10 3512603500 HANDLE DOOR PC 1
A09
A05
A06
A07
A10
A08
A01
8
(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/cm2.
9
✔ 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 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.
10
6. To remove high voltage capacitor.
assembled oven with door normally closed.
(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/cm2 for a fully
Metallic
gasket
plate
Magnetron antenna
Cooling fin
Filament
terminal
11
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.
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)
10. To remove Lamp assembly parts.
1
2
3
4
5
6
7
8
9
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 .
1
4
2
3
(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 .
6
7
8
5
7
(7) Reverse the above steps for reassembly.
13
✔ 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. To remove Top heater assembly parts.
5
6
7
8
1
2
3
4
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 .
1
4
2
3
(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 .
5
6
7
8
8
(7) Reverse the above steps for reassembly.
14
✔ 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)
12. To remove Rear heater assembly parts.
14
13
12
15
16
17
1
2
18
3
4
5
8 7 6
11 10
REF.NO PART CODE PART NAME DESCRIPTION
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 .
11
(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.
9
Q’ T
1
3
5
15
8
6
13
18
17
2
4
10
7
14
14
9
Y
REMARK
14
16
(10) Reverse the above steps for reassembly.
15
✔ 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)
13. To remove Motor synchro. And Under heater assembly parts.
5
4
3
2
1
CUTTING (6EA)
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 .
1
5
4 2
(6) Reverse the above steps for reassembly.
16
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/cm2, readjust interlock mechanism.
17
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.
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.
TROUBLE 1) Oven does not operate at all; inputs can not be accepted.
CONDITION CHECK RESULT CAUSE REMEDY
Fuse blows
Check continuity of
interlock monitor switch
with door closed
( COM NC )
Check continuity of
both primary and
secondary interlock
switch with door closed
Check continuity of
primary interlock switch
contact with door partially
open until
interlock monitor
switch contact close
( COM NC close )
Check continuity of
Primary winding of low
voltage transformer
Continuity Malfunction
(COM
No continuity
No
Continuity
0-or infinite
NC)
Continuity
Continuity
Of Interlock
monitor switch
Malfunction
Of interlock
switch
Shorted contacts
of Primary
Interlock switch
Defective
Low voltage
transformer
Replace
Replace
Replace
Replace
Disconnect high voltage
Fuse and operate the unit
Approx.
530
( normal )
Fuse again
blows
18
Defective
high voltage
transformer
Replace
.
board
CONDITION RESULT REMEDY
Outlet has
Proper
CHECK CAUSE
Check continuity of
magnetron
No
Continuity
Defective
magnetron.
Replace
voltage
Fuse does
not blow?
Check continuity of
noise filter board
Check continuity of
Power supply cord
No
Continuity
No
Continuity
Continuity
Defective
Noise filter
Open power
supply cord
Defective
touch control
Circuit
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
Check continuity of
secondary interlock
switch
Check continuity of
heater
Check D.C voltage
Being supplied to
RELAY (RY2) coil
No
Continuity
No
Continuity
No
continuity
0V
Approx
24V DC
Malfunction
Of primary
Interlock switch
Malfunctioon
Of secondary
interlock switch
Defective
heater
Defective
Touch control
circuit
Faulty contacts
of RELAY
(RY2) or open
relay coil
Adjust or
Replace
Adjust or
replace
Replace
Replace
Replace
19
switch
D.O.M switch
RELAY(RY4) coil
D.O.M switch
Circuit
TROUBLE 3) 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 RESULT REMEDY
CHECK CAUSE
Turn table
motor and
oven lamp do
Check continuity of
Primary interlock
No
Continuity
malfunction
of primary
interlock switch
not turn on
Check continuity of
Secondary interlock and
Check D.C voltage
Being supplied to
No
Continuity
0V
Approx.
24V DC
Malfunction
Of secondary
Interlock and
Defective
touch control
Fault contacts
of RELAY
(RY4) or open
relay coil.
TROUBLE 4) 1) Convection heater is not heated; food will not become hot.
2) convection fan motor does not rotate.
Adjust or
Replace
Adjust or
Replace
Replace
Replace
CONDITION CHECK RESULT CAUSE REMEDY
1) Convection
heater is
not heated.
Check continuity of
Primary interlock switch
No
Continuity
Malfunction
Of primary
Interlock switch
Adjust or
Replace
2) Convection
Fan and
Motor does
Not rotate.
Check continuity of
secondary interlock
switch
Check continuity of
(heater or motor)
Check D.C voltage
Being supplied to
RELAY (RY3, RY6) coil
No
Continuity
No
continuity
0V
Approx
24V DC
Malfunctioon
Of secondary
interlock switch
Defective
motor
Defective
Touch control
circuit
Faulty contacts
of RELAY
(RY3,RY6) or
open relay coil
Adjust or
replace
Replace
Replace
Replace
20
not heated.
TROUBLE 5) Bottom heater is not heated; food will not become hot.
CONDITION CHECK RESULT CAUSE REMEDY
Bottom
heater is
Check continuity of
Primary interlock switch
Check continuity of
secondary interlock
switch
Check continuity of
heater
Check D.C voltage
Being supplied to
RELAY (RY7) coil
No
Continuity
No
Continuity
No
continuity
0V
Approx.
24V DC
Malfunction Of
primary Interlock
switch
Malfunction
Of secondary
interlock switch
Defective
heater
Defective
Touch control
circuit
Faulty contacts
of RELAY
(RY7) or open
relay coil
Adjust or
Replace
Adjust or
replace
Replace
Replace
Replace
(TROUBLE 6) The Following visual conditions indicate a probable defective touch control Circuit
or button P.C.B assembly
1. incomplete segments.
1) segment missing
2) partial segments missing
3) digit flickering other than normal fluorescent slight flickering
2. A distinct change in the brightness of one or
more numbers exists in the display
3. One or more digits in the display are not on
when they should be.
4. Display does not count down or up with time cooking or
clock operation.
5. Oven is programable and cooks normally but no display shows.
6. Display obviously jumps in time while counting down.
7. display counts down noticeably too fast while cooking.
8.Display does not show the time of day when clear button is touched.
9.Oven lamp and turn table motor do not stop although cooking is finished.
Check if the RELAY(RY4) contacts close and if they are close, replace touch control circuit.
CONDITION CHECK RESULT CAUSE REMEDY
Display does
Not show
Programming
At all. Even if
button is
Touched.
Check each button
For continuity of the
Button
Normal Malfunction
Of touch
Control
circuit of
Control box
sub-assembly
Replace
control box
sub-assembly
21
TROUBLE 7) When “ERROR 2 & ERROR 3” come on display.
continuty
heater
control circuit
CONDITION CHECK RESULT CAUSE REMEDY
“ERROR2 &
ERROR3”
come on
display
Check continuity of
thermistor
(resistance of
thermistor)
Check continuity of
heater
( convection, upper,
lower )
0 or infinite Replace
Approx
100k ~ 1000k
(
room
temperature)
NO
continuity
Replace
Defective
Defective touch
Replace
Replace
22
9. MEASUREMENT AND TEST
9-1. 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 wit 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 DT/t
· DT is difference between initial and ending temperature.
· t is the heating time.
The power measured should be B (Refer to 2. 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 2. 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
9-2. MICROWAVE RADIATION TEST
WARNING
l Make sure to check the microwave leakage before and after repair of adjustment.
l Always start measuring of an unknown field to assure safety for operating
personnel from microwave energy.
l Do not place your hands into any suspected microwave radiation field unless the
safe density level is known.
l Care should be taken not to place the eyes in direct line with the source of
microwave energy.
l Slowly approach the unit under test until the radiometer reads an appreciable
microwave leakage from the unit under the test.
PROCEDURE
A) Prepare Microwave Energy Survey
Meter, 600cc glass beaker, and glass
thermometer 100°C (212°F ).
B) Pour 275cc ±15cc of tap water initially
at 20 ± 5 °C (68 ± 9°F) in the 600 cc
glass beaker with an inside diameter of
approx. 95 mm(3.5 in.).
C) Place it at the center of the tray and set
it in a cavity.
D) Close the door and operate the oven.
E) Measure the leakage by using
Microwave Energy Survey Meter with
dual ranges, set to 2450MHz.
- 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.
- When measuring the leakage, always use the 5 cm (2 in.) 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.
- 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.
- 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
9-3. 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
(A) Remove connections from the transformer terminals and check continuity.
(B) Normal readings should be as follows :
Secondary winding ... Approx. 100 ±10%
Filament winding ... Approx. 0
Primary winding ... Approx. 1.2
2. High voltage capacitor
(A) Check continuity of capacitor with meter on the highest OHM scale.
(B) A normal capacitor will show continuity for a short time, and then indicate
10MW once the capacitor charged.
(C) A shorted capacitor will show continuous continuity.
(D) An open capacitor will show constant 10M
(E) Resistance between each terminal and chassis should be infinite.
3. High voltage diode
(A) Isolate the diode from the circuit by disconnecting the leads.
(B) 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 500V dc 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 in the other direction.
4. Magnetron
For complete magnetron diagnosis, refer to “Measurement of the Microwave Output
Power." Continuity checks can only indicate and open filament or a shorted
magnetron. To diagnose for an open filament or a shorted magnetron,
(A)
Isolate magnetron from the circuit by disconnecting the leads.
(B) A continuity check across magnetron filament terminals should indicate 0.1 or
less.
(C) 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 normal
ly.
25
9 -4. COMPONENT ACTION
MANUAL
MODE
COOKING MODE
M/W
GRILL-1
GRILL-2
GRILL-3
COMBI-1
COMBI-2
COMBI-3
COMBI-4
COMBI-5
CONVECTION 100~130 ¡É
CONVECTION 140~150 ¡É
MAGNETRON
UPPER
ELEMENT
LOWER
ELEMENT
REAR
ELEMENT
CONVECTION FAN
ONE
TOUCH
AUTO
MODE
CONVECTION 160~250 ¡É
CAKE / BREAD
CRUSTY
ROAST BEEF
ROAST CHICKEN
ROAST PORK
BAKED FISH
BAKED POTATO
ROAST POTATO
FRESH VEGETABLES
FROZEN VEGETABLES
CASSEROLE
26
10. WIRING DIAGRAM
27
11. EXPLODED VIEW AND PARTS LIST
11-1. DOOR ASSEMBLY
Refer to 6.Disassembly and assembly.
11-2. CONTROL PANEL ASSEMBLY
Refer to 6.Disassembly and assembly.
11-3. TOTAL ASSEMBLY
F48
F43
F81
F41
F40
F47
F46
F45
F39
F62
F53
F64
F65
F66
F67
F68
F69
F70
F71
F72
F55
F54
F52
F61
F60
F53
F59
F56
F42
F38
F37
F51
F50
F35
F36
F49
F57
F58
F80
F22
F25
F21
F34
F33
F27
F26
F24
F23
F32
F29
F28
F30
F16
F17
F18
F73
F44
F31
F08
F11
F10
F09
F12
F15
F13
F14
F19
F07
F06
F05
F04
F03
F02
F01
B00
F74
F75
F76
F77
F78
F20
F79
A00
28
✔ Caution:
NO PART CORD PART NAME DESCRIPTION Q'TY
A00 3511714000 DOOR AS KOC-1B0K0S 1
B00 3516724900 CONTROL PANEL AS KOC-1B0K0S 1
F01 3515202200 STOPPER HINGE *U AS KOR-121M0A 1
F02 7122400800 SCREW TAPTITE TT3 TRS 4X8 MFZN 1
F03 3510313500 BASE SBHG T0.8 1
F04 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 5
F05 3512101400 FOOT DASF-310 4
F06 3516003700 SPECIAL SCREW TT3 HEX 4X8 FLG MFZN 4
F07 3518117010 TRANS HV DW-N95S0-1BT 1
F08 3518701400 FUSE HV 5KV 0.7A 1
F09 3518302300 CAPACITOR HV 2100VAC 1.10uF #187 1
F10 3518400400 DIODE HV HVR-1X-3AB 12KV #187 1
F11 3513003200 HOLDER HV CAPAITOR SECC T0.6 1
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)
F12 7272400811 SCREW TAPTITE TT3 TRS 4X8 MFZN 1
F13 3511407500 COVER HEATER *U STS430 T0.5 1
F14 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 1
F15 3515304000 SUPPORTER HEATER *U STS 430 T0.5 1
F16 3512802000 HEATER *U 230V 400W R18374001 1
F17 7113400814 SCREW TAPPING T1 BIN 4X8 MFZN 1
F18 3966510200 MOTOR SYNCRO 230V 25W GM-16-24FD24 1
F19 7112401011 SCREW TAPPING T1 TRS 4X10MFZN 1
F20 3517401900 COUPLER PTFE 1
F21 3511408300 COVER WAVE GUIDE MICA T0.35 1
F22 3516111300 CAVITY JOINT AS KOC-1B0K0S 1
F23 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 1
F24 3518002900 MAGNETRON 2M218J(F)P 1
F25 3516004000 SPECIAL SCREW T2 BOLT FLANGE 5X12 DACRO 1
F26 3513804700 LOCK POM 1
F27 3513702100 LEVER SW MICRO POM KOG-846TOS 1
F28 4415A17352 SW MICRO VP-533A-0F SPNO #187 200G 2
F29 4415A66910 SW MICRO VP-531A-0F/SZM-V16-FA-61 2
F30 3513700800 LEVER LOCK POM 1
F31 3512717700 HARNESS MAIN KOC-1B0K0S 1
F32 7S627W50X1 NUT HEX NUT FLANGE M5X0.8P MFZN 1
F33 3511800700 FAN CONVECTION SA1D T0.5 1
F34 7400104011 WASHER PLAIN PW-1-4-MFZN 1
F35 7113400814 SCREW TAPPING T1 BIN 4X8 MFNI 3
29
✔ Caution:
NO PART CORD PART NAME DESCRIPTION Q'TY
F36 3512766800 HARNESS CONVECTION-A KOC-1B0K0S 1
F37 3511407700 COVER HEATER *B SA1D T0.5 1
F38 3513302900 INSULATOR HEATER *B SA1D T0.5 1
F39 7113400814 SCREW TAPPING T1 BIN 4X8 MFNI 4
F40 3963514300 MOTOR SHADED POLE 230V 50Hz MW10CA-T02 1
F41 3511800800 FAN PP GF20 1
F42 7601400811 SCREW MACHINE PAN 4X8 PW MFZN 2
F43 7112401011 SCREW TAPPING T1 TRS 4X10MFZN 1
F44 3512803800 HEATER MIRACLON 115V 550W 270MM 2
F45 3512766900 HARNESS CONVECTION-B KOC-1B0K0S 1
F46 3511407400 COVER *B SBHG-1 T0.6 1
F47 7112401011 SCREW TAPPING T1 TRS 4X10MFZN 2
F48 3511407300 COVER MOTOR *B SBHG-1 T0.6 1
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)
F49 3511800100 FAN PP GF20 1
F50 3963513010 MOTOR SHADED POLE 230V 25W MW15CA-B01 1
F51 3512515300 GUIDE WIND PP GF20 1
F52 3518605001 NOISE FILTER DWLF-M05 1
F53 3513003900 HOLDER LAMP AS KOC-1B0K0S 1
F54 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 1
F55 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 1
F56 7121403011 SCREW TAPPING T2S PAN 4X30 MFZN 2
F57 35113A5QJ5 CORD POWER AS 3X1,5 80X80 120-RTML 1.4M 1
F58 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 2
F59 3513602600 LAMP HALOGEN 2
F60 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 2
F61 3518906100 THERMOSTAT OFF:90 ON:60 V#187 1
F62 7S312X40A1 SCREW SPECIAL T1 TRS 4X10 SE MFZN 4
F63 3510804600 CABINET PAINTING AS KOC-1B0K0S 1
F64 7121400611 SCREW TAPPING T2S PAN 4X6 MFZN 1
F65 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 2
F66 3513302800 INSULATOR HEATER *T SBHG-1 T0.6 1
F67 3512520500 GUIDE AIR OUTLET SA1D T0.5 1
F68 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 1
F69 3511407800 COVER LAMP STS430 T0.5 1
F70 3511407600 COVER HEATER *T STS430 T0.5 1
F71 3512803800 HEATER MIRACLON 115V 550W 270MM 2
F72 3510607700 BRACKET HEATER *T SA1D T0.5 1
30
✔ Caution:
NO PART CORD PART NAME DESCRIPTION Q'TY
F73 3514801400 SENSOR TEMPERATURE PTM-K312-D7 1
F74 3512767000 HARNESS HEATER KOC-1B0K0S 1
F75 3517207300 TRAY RACK AS KOC-1B0KOS 120MM 1
F76 3517207310 TRAY RACK AS KOC-1B0KOS 30MM 1
F77 3517207200 TRAY METAL SPP T0.6 1
F78 3512521000 GUIDE ROLLER AS KOC-1B0K0S 1
F79 3516003700 SPECIAL SCREW TT3 HEX 4X8 FLG MFZN 2
F80 3511407810 COVER LAMP T/GLASS T2.0 1
F81 7402704600 RING-C CR-5 SK5 1
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)
31
12. 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: 230 V / Frequency: 50Hz
Terminal Voltage(load) Voltage(no load)
6 ¦¡ 7 AC 17.0V AC 19.9V
8 ¦¡ 9 AC 1.3V AC 1.6V
9 ¦¡ 10 AC 1.3V AC 1.6V
NOTE 1: Secondary side voltage of the low voltage transformer changes in proportion to
fluctuation of power source voltage.
NOTE2: The allowable tolerance of the secondary voltage is within ± 5% of nominal voltage.
2) Voltage Check
Key check point
NO CHECK POINT REMARK
1 IC1 PIN 63,64
5VDC ± 5%
IC1 PIN 3 8
2
IC1 PIN 3 3 or 34
3
5V
0V
T : 20 ms(50Hz)
5V
0V
T : 250 ns(4MHz)
T
T
- Check method
NO
MEASURE
POINT
WAVE FORM REMEDY REMARK
1 MP1 DC 5V ± 5% Replace ZD3, EC1, No load
2 MP2
NOTE : Each measure point must be measured with GND points.
: The marks of the abovee correspendig voltage (+5V,+24V) are written on the PCB.
DC 24V ± 20%
Replace D 20-23, EC6 No load
32
3) Case of no microwave oscillation
(1) When touching M/W button, oven lamp turns on and Fan motor and turntable rotate, and cook
indicator in display comes on.
* Cause: RELAY 1 does not operate.
- Check method
STATE POINT A POINT B
RELAY 1 ON
RELAY 1 OFF
(2) When touching M/W button, oven lamp does not turn on and turntable motor does not rotate
but cook indicator in display comes on.
+5V DC GND
GND +24V DC
* Cause: RELAY 4 does not operate.
- Check method
STATE POINT A POINT B
RELAY 4 ON
RELAY 4 OFF
(3) When touching M/W button, oven lamp turns on and fan motor does not rotate
but cook indicator in display comes on.
l Cause: RELAY 5 does not operate.
+5V DC GND
GND +24V DC
- Check method
STATE POINT A POINT B
RELAY 5 ON
RELAY 5 OFF
+5V DC GND
GND +24V DC
33
4) Case of no heating of upper grill
When touching GRILL1 & COMBI button, oven lamp turns on and fan motor and turntable
motor rotate and cook indicator in the display comes on.
l Cause: RELAY 2 does not operate.
STATE POINT A POINT B
RELAY 2 ON
RELAY 2 OFF
+5V DC GND
GND +24V DC
5) Case of no heating of lower grill
When touching GRILL2 & COMBI button, oven lamp turns on and fan motor and turntable
motor rotate and cook indicator in the display comes on.
l Cause: RELAY 7 does not operate.
STATE POINT A POINT B
RELAY 7 ON
RELAY 7 OFF
+5V DC GND
GND +24V DC
6) Case of no heating of convection grill
When touching CONVECTION button, oven lamp turns on and fan motor and turntable motor
rotate and cook indicator in the display comes on.
l Cause: RELAY 3 does not operate.
34
STATE POINT A POINT B
RELAY 3 ON
RELAY 3 OFF
+5V DC GND
GND +24V DC
7) Case of no stopping of the count do wn timer
When the door is opened during operation, the count down timer does not stop.
B
A
- Check method
POINT
A B
STATE
1) DOOR OPEN OPEN +5V DC
2) DOOR CLOSED CLOSE GND
CHECK NO METHOD REMEDY
Check the stage(ON,OFF) of the door
1
open monitor switch by resistance
Replace door open monitor switch.
measurement.
35
13. P.C.B. CIRCUIT DIAGRAM
36
37
✔ 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)
PCB ASS’ Y PART LIST
NO NAME SYMBOL SPECIFCATION PART CODE Q'TY
1 PCB MAIN M223 95.5 X 197 3514322300 1
2 PCB SUB M224 90 X 197 3514322310 1
3 BUZZER BZ1 BM-20K 3515600100 1
4 CAPACITOR CERAMIC C1~C3,C6~C11 104 50V Z AXIAL CCZF1H104Z 9
5 CAPACITOR CERAMIC C4,C5 102 50V Z AXIAL CCZB1H102K 2
6 CAPACITOR ELECTRO EC1 50V RS 10uF CEXE1H100A 1
7 CAPACITOR ELECTRO EC2,EC4 35V RSS 220uF CEXF1V221V 2
8 CAPACITOR ELECTRO EC6 35V RSS 1000uF CEXF1V102V 1
9 CAPACITOR ELECTRO EC5 50V RSS 220uF CEXF1H221V 1
10 CAPACITOR ELECTRO EC3 50V RSS 100uF CEXF1H101V 1
11 CONNECTOR FILM CN3 HLEM15S-1 4CW215SBD0 1
12 CONNECTOR WAFER CN1 35313-0210 30166M7020 1
13 CONNECTOR WAFER CN2 35312-0310 30166M5030 1
14 CONNECTOR WAFER CN4 35328-0610 4CW3061MX0 1
15 DIODE SWITCHING D1~D17 1N4148 AUTO 52mm DZN4148--- 17
16 DIODE RECTIFYING D18~D23 1N4004A AUTO 52mm DZN4004A-- 6
17 DIODE ZENER ZD1 UZ -3.3BSB DZUZ3R3BSB 1
18 DIODE ZENER ZD5 UZ -3.9BSB DZUZ3R9BSB 1
19 DIODE ZENER ZD3 UZ -5.6BSB DZUZ5R6BSB 1
20 DIODE ZENER ZD4 UZ -13BSA DZUZ13BSA- 1
21 DIODE ZENER ZD2 UZ -24BSB DZUZ24BSB- 1
22 DIGITRON DP1 HNM-07MS12 DHNM07MS12 1
23 HOLDER VFD DPH NYLON 66 3513002000 1
24 IC MICOM IC1 TMP87CK14N-1N67 13GS1B0K00 1
25 RESISTOR R1,R4,R7~R9,R14 1/6W 10K Ohm 5% RD-AZ103J- 6
26 RESISTOR R2,R5,R13,R20 1/6W 1K Ohm 5% RD-AZ102J- 4
27 RESISTOR R6 1/6W 200 Ohm 5% RD-AZ201J- 1
28 RESISTOR R3 1/6W 1M Ohm 5% RD-AZ105J- 1
29 RESISTOR R16 1/6W 4.7K Ohm 5% RD-AZ472J- 1
30 RESISTOR R22 1/6W 47K Ohm 5% RD-AZ473J- 1
31 RESISTOR R15 1/4W 1K Ohm 5% RD-4Z102J- 1
32 RESISTOR R19 1/2W 270 Ohm 5% RD-2Z271JS 1
33 RESISTOR R21 1/2W 27 Ohm 5% RD-2Z270JS 1
34 RESISTOR R17 1/2W 200 Ohm 5% RD-2Z201JS 1
35 RESISTOR R18 1/2W 200 Ohm 5% RD-2Z201JS 1
36 RESISTOR R10 1/4W 301K Ohm 1% RN-4Z3013F 1
37 RESISTOR R11 1/4W 10K Ohm 1% RN-4Z1002F 1
38 RESISTOR R12 1/4W 120K Ohm 1% RN-4Z1203F 1
39 RESISTOR ARRAY RA1 7P(6) 1/8 100K 5% RA-87X104J 1
40 RESISTOR ARRAY RA2,RA3 5P(4) 1/8 100K 5% RA-85X104J 2
41 RESONATOR CERAMIC CR1 KBR-4.0MKSTF 5PKBR40MKS 1
42 SW RELAY RY1~RA3 G5G-1A-DT 24V 5SC0101124 3
43 SW RELAY RA4~RA7 OJ-SS-124LM 5SC0101405 4
44 TRANSISTOR Q1,Q2 KTA1266Y AUTO TZTA1266Y- 2
45 TRANSISTOR Q3,Q4,Q12,Q15 KTC3198GR AUTO TZTC3198GR 4
46 TRANSISTOR Q14 KTC-1027Y AUTO TZTC1027Y- 1
47 TRANSISTOR Q5~Q11,Q13 KRC106M AUTO TZRC106M-- 8
48 TRANS POWER LVT1 DMR-210FS 5EPV041410 1
49 THERMISTOR PTM-K312-D7 3514801400 1
50 CONNECTOR WAFER CN101 HLEM15R-1 4CW215RBD0 1
51 RESISTOR R101,R102 1/6W 1K Ohm 5% RD-AZ102J- 2
52 RESISTOR R103,R104 1/6W 10K Ohm 5% RD-AZ103J- 2
53 SW ROTARY EN101 SDB161PVB17F-1-2- 5S10109002 1
36-36PC(PITCH5)
54 SW TACT SW101~SW115 KPT-1115AM 5S50101Z93 15
55 WIRE FLAT WF1 1.25X15X90XC WSJ-159007 1
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