Daewoo KOC-910K0P(AL) Service Manual
Service Manual
Microwave Oven
Model: KOC-910K0P(AL)
DAEWOO ELECTRONICS CO., LTD.
S/M No. : C910K0PAL1
http : //svc.dwe.co.kr Mar. 2002
1
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
Do not operate or allow the oven to be operated with the door open.
Make the following safety checks on all ovens to be serviced before activating the magentron 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.
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.
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)
(b)
(C)
(d)
1. SAFETY AND PRECAUTIONS
2. SPECIFICATIONS
3. EXTERNAL VIEW
3-1. OUTER DIMENSION
3-2. FEATURE DIAGRAM
4. INSTALLATION
5. CONTROL PANEL
6. DISASSEMBLY AND ASSEMBLY
7. INTERLOCK MECHANISM AND ADJUSTMENT
8. TROUBLE SHOOTING GUIDE
9. MEASUREMENT AND TEST
9-1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT
9-2. MICROWAVE RADIATION TEST
9-3. COMPONENT TEST PROCEDURE
9-4. COMPONENT ACTION
10. WIRING DIAGRAM
11. EXPLODED VIEW AND PARTS LIST
11-1. DOOR ASSEMBLY
11-2. CONTROL PANEL ASSEMBLY
11-3. TOTAL ASSEMBLY
12. PRINTED CIRCUIT BOARD
13. P.C.B CIRCUIT DIAGRAM
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3
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3
4
5
6
7
17
18
24
24
25
26
27
28
29
29
29
29
33
37
TABLE OF CONTENTS
TABLE OF CONTENTS
2
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 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.
1. SAFETY AND PRECAUTIONS
3
KOC-910K0P
220V~60Hz SINGLE PHASE WITH EARTHING
1550W
1600W
2300W
3000W
1000W(IEC705)
2450MHz
542
×329×515mm (21.3×13.0×20.3in.)
350
×230×355mm (13.8×9.1×14.0in.)
APPROX. 21Kg(46.3 lbs.)
60minutes
MICROWAVE/GRILL/CONVECTION/COMBINATION
10 LEVELS
1.0 Cu. Ft
MODEL
POWER SUPPLY
MICROWAVE
GRILL
CONVECTION
COMBINATION
MICROWAVE ENERGY OUTPUT
MICROWAVE FREQUENCY
OUTSIDE DIMENSIONS (W
×H×D)
CAVITY DIMENSIONS (W
×H×D)
NET WEIGHT
TIMER
FUNCTION SELECTIONS
POWER SELECTIONS
CAVITY VOLUME
POWER
CONSUMPTION
1. OUTER DIMENSION
- KOC-910K
2. SPECIFICATIONS
3. EXTERNAL VIEW
542
329
515
4
2. FEATURE DIAGRAM
1. 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.
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.
14
1
2456
7
813 1012311 9
5
4. INSTALLATION
EARTHING INSTRUCTIONS
Warning
Improper use of the earthing plug can result in a risk of electric shock.
Consult a qualified electrician or serviceman if the earthing instructions are not completely understood, or if doubt exists as
to whether the appliance is properly earthed, and either.
If it is necessary to use an extension cord, use only 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
4. INSTALLATION
EARTHING INSTRUCTIONS
Warning
Improper use of the earthing plug can result in a risk of electric shock.
Consult a qualified electrician or serviceman if the earthing instructions are not completely understood, or if doubt exists as
to whether the appliance is properly earthed, and either.
If it is necessary to use an extension cord, use only 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
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.
4. INSTALLATION
EARTHING INSTRUCTIONS
Warning
Improper use of the earthing plug can result in a risk of electric shock.
Consult a qualified electrician or serviceman if the earthing instructions are not completely understood, or if doubt exists as
to whether the appliance is properly earthed, and either.
If it is necessary to use an extension cord, use only 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
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
All air vents should be kept a clearance. If all vents are covered during operation, the oven may overheat and, eventually,
cause failure. The minimum height of free space necessary above the top surface of the oven is minimum 100mm.
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 amperes, 220V, 60Hz
Power supply cord is about 1.1 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.
If the supply cord is damaged, it must be replaced by te manufacturer or its service agent or a similarity qualified person
in order to avoid a hazard.
6. Examine the oven after unpacking for any damage such as:
A misaligned door, broken door or a dent in cavity.
If any of the above are visible, DO NOT INSTALL, and notify dealer immediately.
7. Do not operate the oven if it is colder than room temperature.
(This may occur during delivery in cold weather.) Allow the oven to become room temperature before operating.
This appliance must be earthed. In the event of an electrical short circuit, earthing reduces the risk of the electric shock by
providing an escape wire for the electric current. This appliance is equipped with a cord having a earthing wire with a earthing
plug. The plug must be plugged into an outlet that is properly installed and earthed.
4. INSTALLATION
EARTHING INSTRUCTIONS
Warning
Improper use of the earthing plug can result in a risk of electric shock.
Consult a qualified electrician or serviceman if the earthing instructions are not completely understood, or if doubt exists as
to whether the appliance is properly earthed, and either.
If it is necessary to use an extension cord, use only 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
BUTTONS
6
5. CONTROL PANEL
BUTTONS
More
Less
Clock
Language
Memory
Cake
Crusty
Auto Cook
Defrost
Auto
Stop/
Clear
Start/
Speedy Cook
T
Grill
M/W
Co
ve
n
cti
on
m
bi
Co
i
m
e
W
e
i
g
h
t
Q
u
a
n
t
i
t
y
1
7
6
5
2
3
4
8
11
10
15
12
9
14
13
17
18
20
21
16
19
23
22
6
5. CONTROL PANEL
BUTTONS
6
5. CONTROL PANEL
DISPLAY WINDOW
1. MICROWAVE -
indicator, showing microwaving in
progress.
2. DEFROST -
indicator, showing defrosting in progress.
3. GRILL(upper grill heater) -
indicator, showing grilling in
progress
4. GRILL(lower grill heater) -
indicator, showing grilling in
progress
5. CONVECTION -
indicator, showing convectioning in
progress
6. CHILD LOCK -
indicator.
7. % -
Percentage microwave power level indicator.
BUTTONS
8. MORE -
Use to add time to cooking.
9. LESS -
Use to reduce time from cooking.
10. CLOCK -
Use to set clock.
11. LANGUAGE -
Press to select the language.
12. CRUSTY -
Press to select crusty menu.
13. CAKE -
Press to select cake menu.
14. MEMORY -
Use to set favorite cooking mode.
15. AUTO COOK -
Press to select auto cook menu.
16. M/W -
Press to select microwave power level.
17. GRILL -
Press to select grill.
18. AUTO DEFROST -
Press to select defrost menu.
19. CONVECTION -
Press to select convection temperature.
20. COMBI -
Press to select combi cooking mode.
21. DIAL KNOB -
Use to set time, weight and quantity
22. STOP/CLEAR -
Press once to stop a programme, and
twice to cancel a programme.
23. START/SPEEDY COOK -
Press to start a programme, also
for speedy start (each press adds 30 seconds microwave
cooking time.)
- KOC-910K
More
Less
Clock
Language
Memory
Cake
Crusty
Auto Cook
Defrost
Auto
Stop/
Clear
Start/
Speedy Cook
T
Grill
M/W
Co
ve
n
cti
on
m
bi
Co
i
m
e
W
e
i
g
h
t
Q
u
a
n
t
i
t
y
1
7
6
5
2
3
4
8
11
10
15
12
9
14
13
17
18
20
21
16
19
23
22
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 capactior by using a
properly insulated screwdriver to discharge.
4. When the 15A fuse is blown out due to the operation of the monitor
switch, replace primary interlock switch, secondary interlock switch and
interlock monitor switch.
5. After repair or replacement of parts, make sure that the screws are
properly tightened, and all electrical connections are tightened.
6. Do not operate without cabinet.
SHORT
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
A01
A02
A03
A04
A05
A06
A07
A08
A09
REF NO.
A01
A02
A03
A04
A05
A06
A07
A08
A09
PART CODE
3512603600
3512204800
3517007100
3515204900
3512302400
7122400811
3513101200
3515101800
3511714700
PART NAME
HANDLE DOOR
FRAME DOOR
BARRIER-SCREEN
O
STOPPER HINGE
T AS
GASKET DOOR
SCREW TAPPING
HOOK
SPRING HOOK
DOOR SEAL AS
DESCRIPTION
PC
PC
TEMP GLASS T3.2
KOC-1B0K0S
PBT
T2S TRS 4
×8 MFZN
POM
PW1
KOC- 910K0S
Q’TY
1
1
1
1
1
2
1
1
1
REMARK
1. To remove cabinet
1) Remove four screws on cabinet back.
2) Push the cabinet backward.
2. To remove guide wind assembly
1) Remove two screws which secure the stopper hinge top.
2) Remove the door assembly from top plate of cavity.
3) Reverse the above for assembly.
3. To remove door parts.
KOC-910K
NOTE :
After replacing the door assembly, perform a check of correct
alignment with the hinge and cavity front plate.
9
(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.
(1) To reduce gap located on part ‘B’.
Loosen two screws on stopper hing under, and then push the
door to contact the door seal to oven front surface.
Tighten two screws.
A
B
NOTE :
A small gap may be acceptable if the microwave leakage does not exceed 4mW/cm2.
10
B01 B02
B04
B05
B03
B06B07
B08
B09B10B11B12B13
REF NO.
B01
B02
B03
B04
B05
B06
B07
B08
B09
B10
B11
B12
B13
PART CODE
3515501800
3516725200
3516909000
3516909200
3516909100
7122401211
PKMPMSYM00
7121301011
3514323800
3513406300
3516909300
3516909400
3511605200
PART NAME
WINDOW DISPLAY
CONTROL PANEL
BUTTON FUNCTION-A
BUTTON FUNCTION-C
BUTTON FUNCTION-B
SCREW TAPPING
PCB MAIN AS
SCREW TAPPING
PCB SUB AS
KNOB VOLUME
BUTTON FUNCTION-D
BUTTON START
DECORATOR RING
DESCRIPTION
PMMA
PC
ABS SG-175, AF-0760D
ABS SG-175, SG-0760D
ABS SG-175, SG-0760D
T2S TRS 4
×12 MFZN
KOC-910K0S
T2S PAN 3
×10 MFZN
KOC-910K0S
ABS SG-175, SG-0760D
ABS SG-175, SG-0760D
ABS SG-175, SG-0760D
ABS SG-175, SG-0760D
Q’TY
1
1
1
1
1
4
1
8
1
1
1
1
1
REMARK
5. To remove control panel parts.
KOC-910K
(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(B06) which secure the PCB Main ASS’Y.
(3) Pull out the Main PCB assembly(B07).
(4) Remove eight screws(B08) which secure the PCB Sub ASS’Y.
(5) Pull out the Sub PCB assembly(B09).
(6) Pull out the Knob volume(B10) from the Sub PCB assembly.
(7) Pull out five buttons from the control panel.
(8) Pull out Decorator ring(B13) from the start button.
(9) Pull out Window display(B01) from the control panel.
(10) Reverse the above steps for reassembly.
111111
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.
1) Remove a screw which secure the magnetron.
2) Remove the magnetron.
3) Reverse the above steps for reassembly.
11
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.
Magnetron
antenna
Matallic
gasket
plate
Cooling fin
Filament
terminal
< MAGNETRON >
Wave guide Magnetron antenna
Metallic gasket plate
Wave guide Magnetron antenna
Metallic gasket plate
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/cm2for a fully assembled oven with door normally closed.
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/cm2for a fully assembled oven with door normally closed.
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/cm2for a fully assembled oven with door normally closed.
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/cm2for a fully assembled oven with door normally closed.
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