Service Manual - Daewoo
S/M
: C910K0S001
S/M
No.No.
: C924T0S002
Service Manual
Microwave Oven
Model: KOC-924T0S
KOC-924T5S
KOC-924T0S01
KOC-924T5S01
DAEWOO ELECTRONICS CO., LTD.
http : //svc.dwe.co.kr
May. 2002
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 if 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.
TABLE OF CONTENTS
1. SAFETY AND PRECAUTIONS....................................................................................................................................2
2. SPECIFICATIONS ........................................................................................................................................................3
3. EXTERNAL VIEW.........................................................................................................................................................4
3-1. OUTER DIMENSION ..........................................................................................................................................4
3-2. FEATURE DIAGRAM .........................................................................................................................................5
4. INSTALLATION ............................................................................................................................................................6
5. CONTROL PANEL .......................................................................................................................................................7
6. DISASSEMBLY AND ASSEMBLY ..............................................................................................................................8
7. INTERLOCK MECHANISM AND ADJUSTMENT.....................................................................................................18
8. TROUBLE SHOOTING GUIDE ..................................................................................................................................19
9. MESUREMENT AND TEST .......................................................................................................................................24
9-1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ........................................................................24
9-2. MICROWAVE RADIATION TEST ....................................................................................................................25
9-3. COMPONENT TEST PROCEDURE................................................................................................................26
9-4. COMPONENT ACTION....................................................................................................................................27
10. WIRING DIAGRAM...................................................................................................................................................28
11. EXPLODED VIEW AND PARTS LIST .....................................................................................................................30
11-1. DOOR ASSEMBLY.........................................................................................................................................30
11-2. CONTROL PANEL ASSEMBLY.....................................................................................................................30
11-3. TOTAL ASSEMBLY ........................................................................................................................................30
12. PRINTED CIRCUIT BOARD ....................................................................................................................................33
13. P.C.B CIRCUIT DIAGRAM.......................................................................................................................................37
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 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.
(1) inform the manufacturer, importer or assembler,
(2) repair the unit at no cost to the owner,
(3) attempt to ascertain the cause of the excessive leakage,
(4) 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’, earth symbol or coloured green-and-yellow.
The wire which is coloured blue must be connected to the terminal which is marked with the letter ‘N’ or coloured
black.
The wire which is coloured brown must be connected to the terminal which is marked with the letter ‘L’ or coloured
red.
NOTE : This oven is designed for counter-top use only.
2
2. SPECIFICATIONS
MODEL
KOC-924T0S/KOC-924T0S01
POWER SUPPLY
MICROWAVE
230V~50HZ, SINGLE PHASE WITH EARTHING
1500W
POWER
GRILL
1150W
CONSUMPTION
CONVECTION
2550W
COMBINATION
3000W
MICROWAVE ENERGY OUTPUT
1000W(IEC705)
MICROWAVE FREQUENCY
2450MHz
OUTSIDE DIMENSIONS (W X H X D)
542X329X515mm (21.3X13.0X20.3 in.)
CAVITY DIMENSIONS (W X H X D)
350X230X355mm (13.8X9.1X14.0 in.)
NET WEIGHT
APPROX. 20kg (44.1 lbs.)
TIMER
60 minutes
FUNCTION SELECTIONS
MICROWAVE/ GRILL/ CONVECTION/ COMBINATION/(BBQ)
POWER SELECTIONS
10 LEVELS
CAVITY VOLUME
1.0 Cu. Ft
MODEL
KOC-924T5S/KOC-924T5S01
POWER SUPPLY
MICROWAVE
230V~50HZ, SINGLE PHASE WITH EARTHING
1500W
POWER
GRILL
1150W
CONSUMPTION
CONVECTION
1450W
COMBINATION
1500W
MICROWAVE ENERGY OUTPUT
1000W(IEC705)
MICROWAVE FREQUENCY
2450MHz
OUTSIDE DIMENSIONS (W X H X D)
542X329X515mm (21.3X13.0X20.3 in.)
CAVITY DIMENSIONS (W X H X D)
350X230X355mm (13.8X9.1X14.0 in.)
NET WEIGHT
APPROX. 20kg (44.1 lbs.)
TIMER
60 minutes
FUNCTION SELECTIONS
MICROWAVE/ GRILL/ CONVECTION/ COMBINATION/(BBQ)
POWER SELECTIONS
10 LEVELS
CAVITY VOLUME
1.0 Cu. Ft
* Specifications are subject to change without notice.
3
3. EXTERNAL VIEW
1. OUTER DIMENSION
515
329
542
4
2. FEATURE DIAGRAM
11.DOOR HOOK
When the door is closed, it will automatically lock shut. If door is opened while oven is operating, the magnetron
will immediately stop operating.
12.DOOR VIEWING SCREEN
Allows viewing of food. The screen is designed so that light can pass through, but not the microwave.
13.METAL RACK
14.TOP HEATER
Turns on when convection, grill and combi cooking is selected.
15.OVEN LAMP
Automatically turns on during oven operating.
16.SAFETY INTERLOCK SYSTEM
17.CONTROL PANEL
18.TURNTABLE TRAY
Rotates during cooking and ensure even distribution of Microwaves.
It can also be used as a cooking utensil.
19.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. OVEN FRONT PLATE
13.DOOR SEAL
Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage.
14.BARBECUE BAR (KOC-924T0S01/KOC-924T5S01)-Not seen.
This is used barbecue cooking.
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 15(KOC-924T0S)/
12(KOC-924T5S) amperes, 230V, 50Hz.
• 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.
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 of 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
1
1
2
7
KOC-924T
3
MW
2
Grill
Combi
Weight
7
KOC-924T
Defrost
Time
8
Defrost
3
MW
Grill
4
Autocook
Lock
Combi
Weight
Time
8
g
10
9
4
Autocook
Lock
Convection
g
9
10
5
6
Convection
Barbecue
5
Auto cook menu
1. Roast pork
2. Roast beef
3. Roast chicken
4. Baked fish
5. Fresh vegetable
6
Auto cook
11
Combi
22
Auto cook menu
1. Roast pork
2. Roast beef
3. Roast chicken
4. Baked fish
5. Fresh vegetable
Auto cook
11
Combi
12
Weight Defrost
12
Grill
16
13
Time Defrost
Clock
14
17
15
18
Convection
18
Grill
Barbecue
MW
16
MW
17
Auto Defrost
13
14
Clock
Convection
15
19
Stop/Clear
19
Start/Speedy cook
20
Stop/Clear
21
Start/Speedy cook
20
KOC-924T0S/924T5S
21
KOC-924T0S01/924T5S01
Indicators on the display window
Buttons on the control panel
1 COMBI - When blinking, the oven is operating in
q AUTO COOK - Press to select the auto cook menu.
w COMBI - Press to select the combi cooking mode.
e GRILL - Press to select the grill cooking mode.
r MW - Press to select a microwave power level.
t CONVECTION - Press to select convection
COMBI mode.
2 GRILL - When blinking, the oven is operating in
GRILL mode.
3 MW - When blinking, the oven is operating in
MICROWAVE COOK mode.
4 Auto Cook - When blinking, the oven is operating in
AUTO COOK mode.
5 Lock - When lighting, the oven is in CHILD LOCK
mode.
6 Convection - When blinking, the oven is operating in
CONVECTION mode.
7 Defrost Weight - When blinking, the oven is
operating in WEIGHT DEFROST mode.
8 Defrost Time - When blinking, the oven is operating
in TIME DEFROST mode.
9 DISPLAY - Cooking time, power level, indicators and
time are displayed
0 g - When blinking, you can input the weight of food
for cooking.
s BARBECUE - When blinking, the oven is operating
in barbecue. (KOC-924T0S01/924T5S01 only)
temperature.
y WEIGHT DEFROST - Press to select the weight
defrosting cooking. (KOC-924T0S/924T5S only)
AUTO DEFROST - Press to select the auto
defrosting cooking. (KOC-924T0S01/924T5S01 only)
u TIME DEFROST - Press to select the time defrosting
cooking. (KOC-924T0S/924T5S only)
BARBECUE - Press to select the barbecue cooking.
(KOC-924T0S01/924T5S01 only)
i CLOCK - Press to set the clock.
o DIAL KNOB - Turn the dial knob to the cooking time,
the weight of food or the quantity of food.
p STOP/CLEAR - Press to stop the oven operation or
to delete programmed cooking data.
a START/SPEEDY COOK - Press to start a
programmed cooking or for the speedy start(In the
case, the microwave cooking time increases to 5
minutes by 30 seconds every pressing).
7
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 safe
during normal operation. However, carelessness in servicing the oven can result in an electric shock or possible
danger from a short circuit. You are asked to observe the following precautions carefully.
1. Always remove the power plug from the outlet before servicing.
2. Use an insulated screwdriver and wear rubber gloves when servicing the high voltage side.
3. Discharge the high voltage capacitor before touching any oven components or wiring.
(1) Check the grounding.
Do not operate on a two-wire extension cord.
The microwave oven is designed to be used while 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 has stopped, 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 20A 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, take care when 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
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 assemby.
NOTE: After replacing the door assembly, perform a check
of correct alignment with the hinge and cavity front
plate.
9
3. To remove door parts.
A10
A09
A08
A07
A11
A12
A04
A05
A06
A03
A13
A02
A01
REF NO.
PART CODE
PART NAME
DESCRIPTION
Q’TY
A01
3512603620
HANDLE DOOR
S455C
1
A02
3511608300
DECORATOR DOOR*R
SUS430 T0.5 H/L
1
A03
3512204820
FRAME DOOR
ALLOY PC+ABS
1
A04
7001503011
SCREW MACHINE
PAN 5*30 MFZN
2
A05
3515101800
SPRING HOOK
PW1
1
A06
3513101200
HOOK
POM
1
A07
3512302400
GASKET DOOR
PBT
1
A08
3516602200
DOOR PLATE
SBHG-3A T0.7
1
A09
3515304800
SUPPORTER HINGE*T
SCP-1 T2.0
1
A10
3517007000
BARRIER-SCREEN*I
TEMP GLASS T2.0
1
A11
3511608700
DECORATOR DOOR*T
SUS430 T0.5 H/L
1
A12
3511608400
DECORATOR DOOR*L
SUS430 T0.5 H/L
1
A13
3511608200
DECORATOR DOOR*U
SUS430 T0.5 H/L
1
10
REMARK
(1) Remove the gasket door from door plate.
(2) Remove screws 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 the handle door and barrier screen outer from door frame.
(7) Reverse the above steps for reassembly.
4. Method to reduce the gap between the door seal and the oven front surface.
(1) To reduce gap located on part ‘A’.
• Loosen two screws on stopper hinge top, and then push the door
to contact the door seal to oven front surface.
• Tighten two screws.
(2) To reduce gap located on part ‘B’.
• Loosen two screws on stopper hinge under, and then push the
door to contact the door seal to oven front surface.
• Tighten two screws.
NOTE : A small gap may be acceptable if the microwave leakage does not exceed 4mW/cm2.
11
5. To remove control panel parts.
B01
B02
B03 B04
B05
B06
B11
PART NAME
B10 B09 B08 B07
REF NO.
PART CODE
DESCRIPTION
Q’TY
B01
3513406310
KNOB VOLUME
ABS SG-175 SG-0760D
1
B02
3515501820
WINDOW DISPLAY
PMMA
1
B03
3511608100
DECORATOR C-PANEL
SUS430 T0.5 H/L
1
B04
3516003940
SPECIAL DOUBLE TAPE
SI-161 T0.15
1
B05
3516725220
CONTROL-PANEL
ABS XR-401 SG-0320G
1
B06
3516909040
BUTTON FUNCTION-A
ABS SG-175 SG-0760D COAT
1
B07
71222401211
SCREW TAPPING
T2S TRS 4*12 MFZN
4
B08
3514323740
PCB MAIN AS
KOC-924T0S/KOC-924T5S
1
B09
7121301011
SCREW TAPPING
T2S PAN 3*10 MFZN
5
B10
3514323820
PCB SUB AS
KOC-924T0S/KOC-924T5S
1
B11
3516909050
BUTTON FUNCTION-B
ABS SG-175 SG-0760D COAT
1
REMARK
(1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly.
(2) Remove four screws(B07) which secure the PCB Main ASS’Y.
(3) Pull out the Main PCB assembly(B08).
(4) Remove four screws(B09) which secure the PCB Sub ASS’Y.
(5) Pull out the Sub PCB assembly(B10).
(6) Pull out the Knob volume(B01) from the Sub PCB assembly.
(7) Pull out ten buttons from the control panel.
(8) Pull out Decorator control panel(B03) from the control panel.
(9) Pull out Window display(B02) from the control panel.
(10)Reverse the above steps for reassembly.
12
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.
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 assembled oven with door normally closed.
Metallic
gasket
plate
Cooling fin
Magnetron
antenna
Filament
terminal
<MAGNETRON>
13
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 reasembly.
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.
14
10. To remove Top heater assembly parts.
5
6
7
1
2
8
3
4
REF NO.
1
2
3
4
5
6
7
8
PART CODE
7112401011
3512520500
3513303000
7112401011
3512767000
3510607700
3512803800
3511407600
PART NAME
SCREW TAPPING
GUIDE AIR OUTLET
INSULATOR HEATER*T
SCREW TAPPING
HARNESS HEATER
BRACKET HEATER *T
HEATER MIRACLON
COVER HEATER *T
DESCRIPTION
T1 TRS 4X10 MFZN
SA1D T0.5
SECC T0.5
T1 TRS 4X10 MFZN
KOC-1B0K0S
SA1D T0.5
115V 550W 270MM
STS430 T0.5
1) Remove a screw 1 and pull out Guide air outlet 2.
2) Remove two screws4 and pull out insulator heater *t3.
3) Pull out the Top heater assembly.
4) Pull out the Harness heater5.
5) Pull out the Braket heater*t from the Cover heater*t8.
6) Pull out the Heater miraclon7 from the Cover heater*t8.
7) Reverse the above steps for reassembly.
15
Q’TY
1
1
1
2
1
1
2
1
REMARK
11. To remove Rear heater assembly parts.
14
13
REF NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
PART CODE
3511407300
7112401011
7112401011
3511407900
3512767600
7113400814
3511409800
3513303400
7113400814
3511800700
3513002300
3512801800
7400104011
7051400811
3963514300
3511800800
7402704600
12 11 10
15
9
8
PART NAME
COVER MOTOR*B
SCREW TAPPING
SCREW TAPPING
COVER*B
HARNESS CONVECTION
SCREW TAPPING
COVER HEATER*B
INSULATOR HEATER*B
SCREW TAPPING
FAN CONVECTION
HOLDER HEATER
HEATER
WASHER PLAIN
SCREW MACHINE
MOTOR SHADED POLE
FAN
RING C
16
17
7
6
1
5
4
3
2
DESCRIPTION
SA1D-80 T0.5
T1 TRS 4*10 MFZN
T1 TRS 4*10 MFZN
SA1D-80 T0.5
KOC-924T0S
T1 BIN 4*8 MFNI
SA1D-80 T0.5
SBHG-1 T0.5
T1 BIN 4*8 MFNI
SA1D-80 T0.5
SUS430 T-.5
230V 1400W 1R18344
PW-1-4 MFZN
PAN 4*8 SW MFZN
230V 50HZ MW10CA-T02
P.P GF20
CR-5 SK5
1) Remove a screw 1 and pull out Cover motor *B2.
2) Remove a screw 3 and pull out Cover *B4.
3) Pull out the Harness convection-B5.
4) Remove four screws6 and then pull out the Rear heater assembly.
5) Remove a Nute and the pull out the Fan convection0.
6) Remove three screws9 and then separate the Cover heater *B7 and the lnsulator heater *B8.
7) Pull out the Heaterw from the Cover Heater *B7.
8) Remove two screwr and then separate the lnsulator heater *B8 and Motor shaded polet.
9) Remove the C-Ringu and then pull out the Fany from Motor shaft.
10)Reverse the above steps for reassebly.
16
Q’TY
1
1
1
1
1
4
1
1
3
1
3
1
1
2
1
1
1
REMARK
12 To remove Barbecue motor syncro and Guide rotary part.
1
2
3
4
5
REF NO.
1
2
3
4
5
PART CODE
441BE5203
3512300301
7113400814
3512521200
7112401011
PART NAME
MOTOR SYNCRO
GASKET
SCREW TAPPING
GUIDE ROTARY
SCREW TAPPING
DESCRIPTION
GM-20-24FDB2
C2700W T1.0
T1 BIN 4X8 MFNI
TEFLON
T1 TRS 4X10 MFZN
1) Remove a screw3 and then pull out Motor syncro1.
2) Pull out the Gasket2 from the Motor syncro.
3) Remove a screw5 and then pull out Rotary guide4.
4) Reverse the above steps for reassembly.
17
Q’TY
1
1
2
1
1
REMARK
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 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 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 screw.
b) Adjust interlock switch assembly position.
c) Make sure that lock lever moves smoothly after adjustment is completed.
d) Tighten completely two mounting screws.
NOTE :
Microwave emission test should be performed after adjusting interlock mechanism.
If the microwave emission exceed 4mW/cm2, readjust interlock mechanism.
18
8. TROUBLE SHOOTING GUIDE
Following the procedure below to check if the oven is defective or not.
1) Check grounding before trouble checking.
2) Be careful of the high voltage circuit.
3) Discharge the high voltage capacitor.
4) When checking the continuity of the switches, fuse or high voltage tranformer, disconnect one load 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 connection of the terminals and power cord before check the parts listed below.
(TROUBLE 1) Oven does not operate at all : any inputs can not be accepted.
CONDITION
Fuse blows.
CHECK
Check continuity of
interlock monitor switch with
door closed
( COM NC )
RESULT
CAUSE
Continuity
Malfunction of
Interlock
monitor switch
(COM↔NC)
REMEDY
Replace
No continuity
No
Continuity
Check continuity of
both primary and secondary
interlock switch with door closed
Malfunction of
interlock switch
Replace
Continuity
Continuity
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
Ω or infinite
Approx.
480Ω~620Ω
( normal )
Fuse again
blows
Disconnect high voltage
fuse and operate the unit
19
Shorted contacts
of primary
interlock Switch
Defective low
voltage
transformer
Defective
high voltage
transformer
Replace
Replace
Replace
CONDITION
CHECK
RESULT
CAUSE
REMEDY
Outlet has
proper
voltage
fuse does not
blow?
Check continuity of
magnetron
No
continuity
Defective
magnetron.
Replace
Check continuity of noise filter
board
No
continuity
Defective line
filter board
Replace
Check continuity of
power supply cord
No
continuity
Open power
supply cord
Replace
No
continuity
Defective touch
control circuit
Replace
NOTE : All these switches must be replaced at the same time, please refer to (7.Interlock mechanism and
adjust) for adjustment instructions
(TROUBLE 2)
Display shows all figures selected, but oven does not start cooking, even though desired program and time
are set and start button is tapped.
CONDITION
CHECK
RESULT
CAUSE
REMEDY
Turn table
motor and
oven lamp
do
not turn on
Check continuity of
primary interlock switch
No
continuity
Malfunction of
primary interlock
switch
Adjust or
replace
Check continuity of
secondary interlock
and D.O.M switch
No
continuity
Malfunction of
secondary
Interlock and
D.O.M switch
Adjust or
replace
Check D.C voltage
being supplied to
RELAY(RY4) coil
0V
Defective touch
control Circuit
Replace
Approx.
24V DC
Fault contacts
of RELAY
(RY4) or open
relay coil.
Replace
20
TROUBLE 3) No microwave oscillation even though fan motor rotates.
CONDITION
CHECK
RESULT
CAUSE
REMEDY
No
microwave
oscillation
Check continuity of
high voltage fuse
No
continuity
Defective
high voltage
fuse
Replace
Check continuity of
high voltage capacitor terminals
with wires removed
Continuity
Defective
high voltage
transformer
1
Check continuity of
high voltage rectifier in forward
and backward
direction with DC megger
Continuity
in backward
direction
Defective high
voltage rectifier
Replace
No microwave oscillation
Connect megger leads to
magnetron terminal and
magnetron body
Continuity
Defective
magnetron
2
Check D.C voltage
being supplied to
RELAY (RY1) coil
0V
Defective
touch control
circuit
Replace
Approx.
24V DC
Faulty contacts of
RELAY
(RY1) or open
relay coil
Replace
Defective
high voltage
transformer
Replace
Defective high
voltage
transformer
Replace
Defective
magnetron
Replace
0 Ω or ∞
1 Check resistance of primary
and secondary coil of high
voltage transformer
1 Check continuity of filament
No continuity
terminal of high voltage
transformer
2 Check continuity of
magnetron heater with wires
removed
No continuity
21
(TROUBLE 4)
Grill heater (upper heater) is not heated; food will not become hot.
CONDITION
Grill heater is
not heated.
CHECK
RESULT
CAUSE
REMEDY
Check continuity of
primary interlock switch
No
continuity
Malfunction of
primary Interlock
switch
Adjust or
replace
Check continuity of
secondary interlock switch
No
continuity
Malfunction of
secondary
interlock switch
Adjust or
replace
Check continuity of
heater
No
continuity
Defective heater
Check D.C voltage
being supplied to
RELAY (RY2) coil
0V
Defective touch
control circuit
Replace
Approx.
24V DC
Faulty contacts of
RELAY
(RY2) or open
relay coil
Replace
Replace
(TROUBLE 5)
1) Convection heater is not heated; food will not become hot.
2) Convection fan motor does no rotate.
CONDITION
CHECK
RESULT
CAUSE
REMEDY
1)Convection
heater is not
heated.
2)Convection
fan and
motor does
not rotate.
Check continuity of
primary interlock switch
No
continuity
Malfunction of
primary Interlock
switch
Adjust or
replace
Check continuity of
secondary interlock
switch
No
continuity
Malfunction of
secondary
interlock switch
Adjust or
replace
Check continuity of
(heater or motor)
No
continuity
Defective motor
Check D.C voltage
being supplied to
RELAY (RY3, RY6) coil
0V
Defective touch
control circuit
Replace
Approx.
24V DC
Faulty contacts of
RELAY
(RY3,RY6) or
open relay coil
Replace
22
Replace
(TROUBLE 6)
The following visual conditions inditions 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 programmable 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
Display does
not show
programming
at all, even if
keyboard is
touched.
Check each button for
continuity of the button
RESULT
Normal
CAUSE
REMEDY
Malfunction of sub
pcb assembly
Replace
control box
sub-assembly
(TROUBLE 7)
When “ERROR 2 ERROR 3” come on display.
CONDITION
CHECK
RESULT
CAUSE
REMEDY
“ERROR 2 &
ERROR 3”
come on
display
Check continuity of thermistor
(resistance of thermistor)
0Ω or infinite
Replace
Replace
No
continuty
Defective
heater
Replace
continuity
Defective touch
control circuit
Replace
Approx
200~300kΩ
(room
temperature)
Check continuity of heater
(convection, upper, lower)
23
9. 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. A cylindrical container of borosilicate glass is used for the test. It has a maximum thickness of 3mm, an external
diameter of approximately 190mm and a height of approximately 90mm.
The mass of the container is determined.
2. At the start of the test, the oven and the empty container are at ambient temperature. Water having an initial
temperature of 10˚C ± 1˚C is used for the test. The water temperature is measured immediately before it is poured
into the container.
3. A quantity of 1000g ± 5g of water is added to the container and its actual mass obtained.
The container is then immediately placed in the centre
of the oven shelf, which is in its lowest normal position.
The oven is operated and the time for the water
temperature to attain 20˚C ± 2˚C is measured. The
oven is then switched off and the final water
temperature is measured within 60s.
NOTE 1 - The water stirred is before its temperature is
measured.
NOTE 2 - Stirring and measuring devices are to have a
low heat capacity.
4. The microwave power output is calculated from the
formula
P = 4,187 • mW (T2 -T1) + 0.55 • mC(T2 - T0)/t
where
P is the microwave power output, in watts ;
mW is the mass of the water, in grams ;
mc is the mass of the container, in grams ;
T0 is ambient temperature, in degrees Celsius ;
T1 is the initial temperature of the water, in degree Celsius ;
T2 is the final temperature of the water, in degrees Celsius ;
t is the heating time, in seconds, excluding the magnetron filament heating-up time.
✻ The microwave power output is stated in watts, rounded off to the nearest 50W
CAUTION
1. Water load should be measured exactly to 1 liter.
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: (T2 = T0)
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
24
2. MICROWAVE RADIATION TEST
WARNING
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.
PROCEDURE
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 600 cc glass beaker with an inside diameter of approx. 95
mm(3.5 in.).
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 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.
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.
25
3. COMPONENT TEST PROCEDURE
• High voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle.
• It is neither necessary nor advisable to attempt measurement of the high voltage.
• Before touching any oven components or wiring, always unplug the oven from its power source and discharge the
capacitor.
1. High voltage transformer
1) Remove connections from the transformer terminals and check continuity.
2) Normal readings should be as follows :
Secondary winding ... Approx. 100 Ω±10%
Filament winding ... Approx. 0 Ω
Primary winding ... Approx. 1.2 Ω
2. High voltage capacitor
1) Check continuity of capacitor with meter on the highest OHM scale.
2) A normal capacitor will show continuity for a short time, and then indicate 10MΩ once the capacitor charged.
3) A shorted capacitor will show continuous continuity.
4) An open capacitor will show constant 10MΩ.
5) Resistance between each terminal and chassis should be infinite.
3. High voltage diode
1) Isolate the diode from the circuit by disconnecting the leads.
2) With the ohmmeter set on the highest resistance scale measure the resistance across the diode terminals.
Reverse the meter leads and again observe the resistance reading. Meter with 6V, 9V or higher voltage batteries
should be used to check the front-back resistance of the diode, otherwise an infinite resistance may be read in
both directions. A normal diode's resistance will be infinite in one direction and several hundred k Ω in the other
direction.
4. Magnetron
For complete magnetron diagnosis, refer to "Measurement of the Microwave Power Output." Continuity checks can
only indicate and open filament or a shorted magnetron. To diagnose for an open filament or a shorted magnetron,
1) Isolate magnetron from the circuit by disconnecting the leads.
2) A continuity check across magnetron filament terminals should indicate 0.1 Ω or less.
3) A continuity check between each filament terminal and magnetron case should read open.
5. Fuse
If the fuse in the primary and monitor switch circuit is blown when the door is opened, check the primary and
monitor switch before replacing the blown fuse. In case the fuse is blown by an improper switch operation, replace
the defective switch and fuse at the same time. Replace just the fuse if the switches operate normally.
26
4. COMPONENT ACTION
COOKING MODE
MAGNETRON
M/W
●
UPPER
LOWER
REAR
CONVECELEMENT ELEMENT ELEMENT TION FAN
●
GRILL-1
●
GRILL-2
GRILL-3
●
●
COMBI-1
●
●
●
●
●
COMBI-2
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
MANUAL
COMBI-3
MODE
COMBI-4
●
●
COMBI-5
●
●
●
CONVECTION100~130
CONVECTION140~150
CONVECTION160~250
ONE
CAKE/BREAD
●
●
●
●
●
TOUCH
CRUSTY
●
●
●
●
●
ROAST BEEF
●
●
●
●
●
ROAST CHICKEN
●
●
●
●
●
ROAST PORK
●
●
●
●
●
BAKED FISH
●
●
●
●
●
AUTO
BAKED POTATO
●
●
●
●
●
MODE
BAKED POTATO
●
●
●
●
●
ROAST POTATO
●
●
●
●
●
FRESH VEGETABLES
●
FROZEN VEGETABLES
●
CASSEROLE
●
27
N
L
GE
BL
BR
POWER SUPPLY :
SINGLE PHASE
ONLY
N
L
28
GN
N
L
WH
RD
RD
FAN
RELAY
BR
FM
RD
MOTOR
RELAY
YW
OL
RD
NOTE :
OL : OVEN LAMP
FM : FAN MOTOR
CM : CONVECTION FAN MOTOR
TTM : TURNTABLE MOTOR
L.V. TRANSFORMER
THERMAL
CUT-OUT
WH
[ CONDITION ]
DOOR : CLOSED
COOK : OFF
FUSE
LINE FILTER ASS’Y
RD
PRIMARY INTERLOCK
SWITCH(UPPER)
BK
YW
CONVECTION HEATER
RD : RED
WH : WHITE
BK : BLACK
YW : YELLOW
BR : BROWN
CONVECTION
FAN
RELAY
BK
CM
RD
TOP HEATER
BK
RD
BL : BLUE
GE : GREEN/YELLOW
GN : GREEN
CONVECTION TOP
HEATER
HEATER
RELAY
RELAY
BL
BL
RD
COM.
GN
GN
NO.
NC.
YW
TTM
WH
BL
D.O.M. SWITCH
POWER
RELAY
SECONDARY
INTERLOCK SWITCH
COM.
BK
WH
CONTROL P.W.B. ASS’Y
BK
NC.
NO.
INTERLOCK
MONITOR SWITCH
BL
RD
WH
WH
HIGH VOLTAGE
TRANSFORMER
H.V.
FUSE
H.V. DIODE
H.V.
CAPACITOR
10. WIRING DIAGRAM
- KOC-924T0S/924T5S
MAGNETRON
THERMISTOR
- KOC-924T0S01/924T5S01
29
F01
F02
F03
F04
30
A00
F05
F08
F68
B00
F71
F06
F66
F09
F63
F62
F67
F07
F10
F61
F65
F69
F11
F60
F64
F50
F59
F49
F70
F12
F51
F45
F13
F44
F14
F58
F55
F52
F53
F20
F16
F57
F54
F48
F47
F19
F43
F46
F18
F17
F15
F56
F40
F21
F23
F42
F41
F22
F26
F39
F38
F25
F24
F27
F37
F35
F34
F36
F33
F32
F31
F30
F28
F29
11. EXPLODED VIEW AND PARTS LIST
1. DOOR ASSEMBLY
Refer to 6. Disassembly and assembly.
2. CONTROL PANEL ASSEMBLY
Refer to 6. Disassembly and assembly.
3. TOTAL ASSEMBLY
NO
PART CODE
PART NAME
A00
3511714520
DOOR AS
KOC-924T0S
1
B00
3516725640
CONTROL PANEL AS
KOC-924T0S
1
3516725650
DESCRIPTION
Q'TY
KOC-924T5S
F01
3516003700
SPECIAL SCREW
TT3 HEX 4*8 FLG MFZN
2
F02
3512521000
GUIDE ROLLER AS
KOC-1BOKOS
1
F03
3517205200
TRAY METAL
SPP T0.6
1
F04
3517202611
TRAY RACK AS
KOC-961C0S 117MM
1
F05
3517401900
COUPLER
PTFE
1
F06
3511408300
COVER WAVE GUIDE
MICA T0.35
1
F07
3516112320
CAVITY AS
KOC-924T0S
1
F08
3512767000
HARNESS HEATER
KOC-1B0KOS
1
F09
3510607700
BRACKET HEATER*T
SA1D-80 T0.5
1
F10
3512803800
HEATER MIRACLON
115V 550W 270MM
2
F11
3511407600
COVER HEATER*T
STS430 T0.5
1
F12
7112401011
SCREW TAPPING
T1 TRS 4*10 MFZN
1
F13
3512520500
GUIDE AIR OUTLET
SA1D-80 T0.5
1
F14
3513303000
INSULATOR HEATER*T
SECC T0.5
1
F15
7112401011
SCREW TAPPING
T1 TRS 4*10 MFZN
2
F16
7121400611
SCREW TAPPING
T2S PAN 4*6 MFZN
1
F17
3518906310
THERMOSTAT
OFF:100 ON:60 V #187
1
F18
7112401011
SCREW TAPPING
T1 TRS 4*10 SE MFZN
2
35113A5QJ5(KOC-924T0S) CORD POWER AS
3*1.5 80*80 120-RTML 1.0M(KOC-924T0S)
1
35113A5QM5(KOC-924T5S)
3*1.0 80*80 120-RTML 1.4M(KOC-924T5S)
F19
F20
3511800100
FAN
PP GF20
1
F21
3963513010
MOTOR SHADED POLE
230V 25W MW15CA-B01
1
F22
3512515300
GUIDE WIND
PP
1
3518605001(KOC-924T0S) NOISE-FILTER
DWLF-M05(KOC-924T0S)
1
3518605500(KOC-924T5S)
DWLF-M07(KOC-924T5S)
F23
F24
7S312X40A1
SCREW SPECIAL
T1 TRS 4*10 SE MFZN
1
F25
7121403011
SCREW TAPPING
T2S PAN 4*30 MFZN
2
F26
3510803500
CABINET
SECC T0.6
1
F27
7S312X40A1
SCREW SPECIAL
T1 TRS 4*10 SE MFZN
4
F28
7112401011
SCREW TAPPING
T1 TRS 4*10 MFZN
1
F29
3511407300
COVER MOTOR*B
SA1D-80 T0.5
1
F30
7112401011
SCREW TAPPING
T1 TRS 4*10 MFZN
1
F31
3511407900
COVER*B
SA1A-80 T0.5
1
F32
3511800800
FAN
PP GF20
1
F33
3512767600
HARNESS CONVECTION
KOC-924T0S
1
F34
7402704600
RING C
CR-5 SK5
1
F35
3963514300
MOTOR SHADED POLE
230V 50HZ MW10CA-T02
1
F36
3513303400
INSULATOR HEATER*B
SBHG-1 T0.5
1
31
NO
PART CODE
PART NAME
DESCRIPTION
F37
3511409800
COVER HEATER*B
SA1D-80 T0.5
1
F38
3511800700
FAN CONVECTION
SA1D-80 T0.5
1
F39
3512801800
HEATER
230V 1400W 1R18344
1
F40
3513002300
HOLDER HEATER
SUS304 T0.5
3
F41
7400104011
WASHER PLAIN
PW-1-4 MFZN
1
F42
3512718320
HARNESS MAIN
KOC-924T0S
1
F43
3516004000
SPECIAL SCREW
T2 BOLT FLANGE 5*12 DACR
1
F44
3518002900
MAGNETRON
2M218J(F)P
1
F45
7122401211
SCREW TAPPING
T2S TRS 4*12 MFZN
1
F46
3513601600
LAMP
BL 240V 25W T25 C7A H187
1
F47
3513700800
LEVER LOCK
POM
1
F48
4415A17352
SW MICRO
VP-533A-OF SPNO #187 200
2
F49
3513816000
LOCK
PP
1
F50
3513702100
LEVER SW MICRO
POM, KOG-846T0S
1
F51
4415A66910
SW MICRO
VP-531-OF/SZM-V16-FA-61
2
F52
7S422X4081
SCREW SPECIAL
TT3 TRS 4*8 SE MFZN
1
F53
3513003200
HOLDER HV CAPACITOR
SECC T0.6
1
F54
3518400400
DIODE HV
HVR-1X-3AB 12KV #187
1
F55
3518302300
CAPACITOR HV
2100VAC 1.1OUE #187
1
F56
3518701400
FUSE HV
5KV 0.7A
1
F57
3518118910
TRANS HV
DW-R10S0-92T
1
F58
7147401011
SCREW TAPPING
T2 FLG HEX 4*10 MFZN
4
F59
3512101400
FOOT
DASE-310
4
F60
7112401011
SCREW TAPPING
T1 TRS 4*10 MFZN
5
F61
3510313600
BASE
SBHG T0.8
1
F62
7272400811
SCREW TAPTITE
TT3 TRS 4*8 MFZN
1
F63
3515202800
STOPPER HINGE*U AS
KOR-121M0A
1
F64
7112401011
SCREW TAPPING
T1 TRS 4*10 MFZN
1
F65
3966510200
MOTOR SYNCRO
230V 25W GM-16-24FD24
1
F66
441BE15203
MOTOR SYNCRO
GM-20-24FDB2 (KOC-924T0S01/924T5S01)
1
F67
3512300301
GASKET
C2700W T1.0 (KOC-924T0S01/924T5S01)
1
F68
7113400814
SCREW TAPPING
T1 BIN 4X8 MFNI (KOC-924T0S01/924T5S01)
1
F69
3512521200
GUIDE ROTARY
TEFLON (KOC-924T0S01/924T5S01)
1
F70
7112401011
SCREW TAPPING
T1 TRS 4X10 MFZN (KOC-924T0S01/924T5S01)
1
F71
3517605700
UTENSIL BAR AS
KOC-910K0S01 (KOC-924T0S01/924T5S01)
1
32
Q'TY
12. PRINTED CIRCUIT BOARD
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)
Voltage(no load)
6-7
AC 17.0 V
AC 19.9 V
8-9
AC 1.3 V
AC 1.6 V
9-10
AC 1.3 V
AC 1.6 V
NOTE
1. Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source
voltage.
2. The allowable tolerance of the secondary voltage is within ± 5% of nominal voltage.
2. Voltage Check
- Key check point
NO
CHECK POINT
1
IC1 PIN 20, 21
2
IC1 PIN 22
REMARK
5VDC±5%
5V
0V
3
T
T : 20 ms(50Hz)
T
T : 250 ns(4MHz)
IC1 PIN 8 OR 9
5V
0V
- Check method
NO
MEASURE POINT
WAVE FORM
REMEDY
REMARK
1
MP1
DC 5V±5%
Replace ZD4, EC1
NO LOAD
2
MP2
DC 24V±20%
Replace D18-21, EC5
NO LOAD
NOTE: Each measure point must be measured with GND points.
33
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.
B
A
16
D8
M/W
RY1
Q4
STATE
POINT A
POINT B
RELAY 1 ON
+5V DC
GND
RELAY 1 OFF
GND
+24V DC
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.
*Cause: RELAY 1 does not operate.
B
LAMP
TRAY
A
23
D11
RY4
Q7
STATE
POINT A
POINT B
RELAY 4 ON
+5V DC
GND
RELAY 4 OFF
GND
+24V DC
3) When touching M/W button, oven lamp turn on and turns on and fan motor does not rotate but cook indicator in
display comes on.
*Cause: RELAY 5 does not operate.
B
FAN
A
24
D12
RY5
Q8
STATE
POINT A
POINT B
RELAY 5 ON
+5V DC
GND
RELAY 5 OFF
GND
+24V DC
34
4. Case of no heating of top grill
When touching GRILL or COMBI button, oven lamp turns on and fan motor and turntable rotate, and cook indicator
in display comes on.
*Cause: RELAY 2 does not operate.
B
A
17
D9
TOP
GRILL
RY2
Q5
STATE
POINT A
POINT B
RELAY 2 ON
+5V DC
GND
RELAY 2 OFF
GND
+24V DC
5. Case of no heating of convection grill
When touching CONVECTION button, oven lamp turns on and Fan motor and turntable rotate and cook indicator
in display comes on.
*Cause: RELAY 3 does not operate.
B
A
18
D11
CONV
GRILL
RY3
Q4
STATE
POINT A
POINT B
RELAY 3 ON
+5V DC
GND
RELAY 3 OFF
GND
+24V DC
35
6. Case of no stopping of the count down timer
When the door is opened during operation, the count down timer does not stop.
A
B
R2
1
CN1
2
3
D6
C1
D.O.M SW
R3
C2
+5V
POINT
A
B
DOOR OPEN
OPEN
+5V DC
DOOR CLOSED
CLOSE
GND
STATE
CHECK NO
1
METHOD
Check the stage(ON,OFF) of the door open
monitor switch by resistance
measurement.
36
REMEDY
Replace door open monitor swith.
13. P.C.B. CIRCUIT DIAGRAM
37
PCB ASS’Y PART LIST
NO
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
NAME
BUZZER
C ARRAY
C CERA
C ELECTRO
C ELECTRO
C ELECTRO
C ELECTRO
CONNECTOR WAFER
CONNECTOR WAFER
CONNECTOR FILM
CONNECTOR WAFER
DIODE
DIODE
DIODE ZENER
DIODE ZENER
DIODE ZENER
DIODE ZENER
DISPLAY VFD
HOLDER VFD
PCB MAIN
R ARRAY
R CARBON FILM
R CARBON FILM
R CARBON FILM
R CARBON FILM
R CARBON FILM
R CARBON FILM
R CARBON FILM
R CARBON FILM
R CARBON FILM
R METAL FILM
R METAL FILM
RESONATOR CERA
IC MICOM
TRANSISTOR
TRANSISTOR
TRANSISTOR
TRANS POWER
SW RELAY
SW RELAY
WIRE COPPER
WIRE COPPER
WIRE COPPER
WIRE FLAT
PCB SUB
CONNECTOR FILM
SW TACT
SW ROTARY
WIRE COPPER
WIRE COPPER
WIRE COPPER
WIRE COPPER
WIRE COPPER
SYMBOL
BZ1
CA1
C1~11
EC1
EC2
EC3,4
EC5
CN1
CN2
CN3
CN4
D1~6,8~14,17
D15,16,18~21
ZD1
ZD2
ZD3
ZD4
DP1
DPH1
M236
RA1
R28
R20~25
R1
R7
R2,6,17~19,26
R3,5,11
R12
R9,13~16,27
R4
R8
R10
CR1
IC1
Q1
Q2,4~10
Q11
LVT1
RY1~3
RY4~6
J2,3,7,8,10~12,16,17,19,20,22
J5,6,13~15,18,21,23
J4,9
WF1
M237
CN101
SW101~108,110,111
SW109
J101~103
SJ1
SJ4
SJ1, 4
-
38
SPECIFCATION
BM-20K
5P(4) 102 M 50V
104 50V Z AXIAL
50V RS 10uF
50V RSS 100uF
50V RSS 220uF
35V RSS 1000uF
35313-0210
35312-0310
HLEM15S-1
35328-0610
1N4148
1N4004A
UZ-3.3BSB
UZ-3.9BSB
UZ-24BSB
UZ-5.6BSB
SVM-5MS06
PP
95x235
5P(4) 1/8 100K J
1/2W 27 5%
1/2W 200 5%
1/4W 6.8 5%
1/6W 200 5%
1/6W 1K 5%
1/6W 10K 5%
1/6W 47K 5%
1/6W 100K 5%
1/6W 1M 5%
1/4W 10K 1%
1/4W 120K 1%
CRT4.00MS
HD404318S
KTA-1266Y
KRC-106M
KTC-3198GR
DMR-210FS
G5G-1A DT DC24V
CS11-24SH 1C 1P
1/0.52 TIN COATING
1/0.52 TIN COATING
1/0.52 TIN COATING
15/90 WH C
90x200
HLEM15R-1
KPT-1115AM
SDB161PVB17F
1/0.52 TIN COATING
924T5S only
924T0S01 only
924T5S01 only
924T0S only
PART CODE
3515600100
CN4XB-102M
CCZF1H104Z
CEXE1H100A
CEXF1H101V
CEXF1H221V
CEXF1V102V
30166M7020
30166M5030
4CW215SBD0
4CW3061MX0
DZN4148--DZN4004A-DZUZ3R3BSB
DZUZ3R9BSB
DZUZ24BSBDZUZ5R6BSB
DSVM5MS063513002000
3514323520
RA-85X104J
RD-2Z270JS
RD-2Z201JS
RD-4Z689JRD-AZ201JRD-AZ102JRD-AZ103JRD-AZ473JRD-AZ104JRD-AZ105JRN-4Z1002F
RN-4Z1203F
5P4R00MTS147S924T00
TZTA1266YTZRC106M-TZTC3198GR
5EPV041410
5SC0101124
5SC0101129
85801052GY
85801052GY
85801052GY
WSJ-159007
3514323620
4CW215RBD0
5S50101Z93
5S10109002
85801052GY
85801052GY
85801052GY
85801052GY
85801052GY
Q'TY
1
1
11
1
1
2
1
1
1
1
1
14
6
1
1
1
1
1
1
1
1
1
6
1
1
6
3
1
6
1
1
1
1
1
1
8
1
1
3
3
12
8
2
1
1
1
10
1
3
1
1
2
0
DAEWOO ELECTRONICS CO., LTD.
686, AHYEON-DONG MAPO-GU SEOUL, KOREA
C.P.O. BOX 8003 SEOUL, KOREA
TELEX: DWELEC K28177-8
CABLE: “DAEWOOELEC”
S/M NO. : C924T0S002
PRINTED DATE: May, 2002
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