DAEWOO ELECTRONICS KOC-1BOK6S User manual

Service Manual
Microwave Oven
Model: KOC-1B0K6S
S/M No. : C1B0K6S001
DAEWOO ELECTRON CS CO., LTD.
http://svc.dwe.co.kr Feb. 2001
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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.........................................................................................................................................................3
1. OUTER DIMENSION.............................................................................................................................................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. MESUREMENT AND TEST .......................................................................................................................................23
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ...........................................................................23
2. MICROWAVE RADIATION TEST .......................................................................................................................24
3. COMPONENT TEST PROCEDURE...................................................................................................................25
4. COMPONENT ACTION.......................................................................................................................................26
10. WIRING DIAGRAM...................................................................................................................................................27
11. EXPLODED VIEW AND PARTS LIST.....................................................................................................................28
12. PRINTED CIRCUIT BOARD ....................................................................................................................................32
13. P.C.B CIRCUIT DIAGRAM.......................................................................................................................................36
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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.
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3. EXTERNAL VIEW
2. SPECIFICATIONS
MODEL KOC-1B0K6S
POWER SUPPLY 230V~50HZ, SINGLE PHASE WITH EARTHING
MICROWAVE 1500W
POWER GRILL 1600W
CONSUMPTION CONVECTION 2300W
COMBINATION 2300W
MICROWAVE ENERGY OUTPUT 1000W(IEC705)
MICROWAVE FREQUENCY 2450MHz
OUTSIDE DIMENSIONS (W X H X D) 560X344X542mm (22.0X13.0X21.3 in.)
CAVITY DIMENSIONS (W X H X D) 368.5X246X376.5mm (14.5X9.7X14.8 in.)
NET WEIGHT APPROX. 21.5kg (47.6 lbs.)
TIMER 60 minutes
FUNCTION SELECTIONS MICROWAVE/ GRILL/ CONVECTION/ COMBINATION
POWER SELECTIONS 10 LEVELS
CAVITY VOLUME 1.2 Cu. Ft
* Specifications are subject to change without notice.
1. OUTER DIMENSION
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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. UNDER HEATER
13. OVEN FRONT PLATE
14.DOOR SEAL
Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage.
2. FEATURE DIAGRAM
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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 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.
(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 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.
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5. CONTROL PANEL
clock
memory
cake
m
w
/
clear
stop/ start/
speedy cook
auto cook
crusty
more
c
g
less
auto
defrost
l
l
i
i
o
m
b
r
4
3
2
1
language
7
6
5
8
9
12
15
17
18
20
22
10
11
13
14
16
19
23
21
c
o
n
v
e
c
t
i
o
n
t
i
m
e
w
e
i
g
h
t
q
u
n
t
i
t
y
DISPLAY WINDOW
1. MICROWAVE - indicator, showing microwaving
in progress.
2. DEFROST- indicator, showing defrosting in
progress.
3. GRILL(upper grill heater) - indicator, showing
griling in progress.
4. GRILL(lower grill heater) - indicator, showing
griling 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 - Used to set clock.
10. LESS - Use to remove time from cooking.
11. MORE - Use to add time to cooking.
12. M/W - Press to select microwave power level.
13. COMBI - Press to select combi cooking mode.
14. AUTO DEFROST - Press to select defrost
menu.
15. CONVECTION - Press to select convection
temperature.
16. GILL - Press to select grill.
17. CAKE - Press to select cake menu.
18. CRISP - Press to select srisp menu.
19. AUTO COOK - Press to select auto cook
menu.
20. MEMORY - Use to set favorite cooking mode.
21. START/SPEEDY COOK- Press to start a
programme, also for speedy start (each press
adds 30 seconds microwave cooking time).
22. STOP/CLEAR - Press once to stop a
programme, and twice to cancel a programme.
23. DIAL KNOB - Use to set time, weight and
quantity.
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6. DISASSEMBLY AND ASSEMBLY
- Cautions to be observed when trouble shooting.
Unlike many other appliances, the microwave oven is high-voltage, high-current equipment. It is completely 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.
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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 assemby.
3. To remove door parts.
NOTE: After replacting the door assembly, perform a
check of correct alignment with the hinge and
cavity front plate.
REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK
A01 3512204700 FRAME DOOR PC 1
A02 3517006900 BARRINER-SCREEN*O TEMP GLASS T3.2 1
A03 3515201011 SCREW TAPPING T1S TRS 4X10 MFZN 2
A04 3515204900 STOPPER HINGE*T AS KOC-1B0K0S 1
A05 3512302300 GASKET DOOR PBT 1
A06 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 1
A07 3513101200 HOOK POM 1
A08 3515101800 SPRING HOOK PW1 1
A09 3511714100 DOOR SEAL AS KOC -1B0K0S 1
A10 3512603500 HANDLE DOOR PC 1
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(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/cm
2
.
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