Daewoo KOC-9N4T7S, KOC-9N4T7S24, KOC-9N5T7S, KOC-9N5T7R, KOC-9N5T7S21 Service Manual
...
Service Manual
Microwave Oven
Model: KOC-9N4T7S
KOC-9N4T7S24
KOC-9N5T7S
KOC-9N5T7R
KOC-9N5T7S21
KOC-9N7T7S
KOC-9N7T7S21
KOC-9N7T7SA2
S/M No. : OC9N4T7001
Jun. 2005
✔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
PRECA UTIONS T O BE OBSERVED BEFORE AND
DURING SER VICING T O AVOID POSSIBLE
EXPOSURE T O EXCESSIVE MICROW AVE 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.....................................................................................................20
8. TROUBLE SHOOTING GUIDE..................................................................................................................................21
9. MESUREMENT AND TEST .......................................................................................................................................26
9-1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT........................................................................26
9-2. MICROWAVE RADIATION TEST....................................................................................................................27
9-3. COMPONENT TEST PROCEDURE................................................................................................................28
9-4. COMPONENT ACTION....................................................................................................................................29
10. WIRING DIAGRAM...................................................................................................................................................30
11. EXPLODED VIEW AND PARTS LIST.....................................................................................................................32
11-1. DOOR ASSEMBLY.........................................................................................................................................32
11-2. CONTROL PANEL ASSEMBLY.....................................................................................................................32
11-3. TOTAL ASSEMBLY........................................................................................................................................32
12. PRINTED CIRCUIT BOARD ....................................................................................................................................36
13. P.C.B CIRCUIT DIAGRAM.......................................................................................................................................41
1
1. SAFETY AND PRECA UTIONS
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
3
MODEL
KOC-9N4T7S, 9N4T7S24,
KOC-9N5T7R
9N5T7S, 9N5T7S21
POWER SUPPLY 230V~50Hz, SINGLE PHASE WITH EARTHING
MICROWAVE 1450W
POWER CONSUMPTION
GRILL 850W
CONVECTION 2250W 1450W
COMBINATION 2950W 1450W
MICROWAVE ENERGY OUTPUT 900W (IEC 705)
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. 18Kg (39.6 lbs.)
TIMER 60 minutes
FUNCTION SELECTIONS Microwave / Grill / Convection / Combination
POWER SELECTIONS 10 LEVELS
CAVITY VOLUME 1.0 Cu. Ft
MODEL KOC-9N7T7S, 9N7T7S21, 9N7T7SA2
POWER SUPPLY 230V~50Hz, SINGLE PHASE WITH EARTHING
MICROWAVE 1450W
POWER CONSUMPTION
GRILL 850W
CONVECTION 2250W
COMBINATION 2950W
MICROWAVE ENERGY OUTPUT 900W (IEC 705)
MICROWAVE FREQUENCY 2450MHz
OUTSIDE DIMENSIONS (W X H X D) 542X329X514.1mm(21.3X13.0X20.2 in.)
CAVITY DIMENSIONS (W X H X D) 350X230X355mm(13.8X9.1X14.0 in.)
NET WEIGHT Approx. 18Kg (39.6 lbs.)
TIMER 60 minutes
FUNCTION SELECTIONS
Microwave / Grill / Convection / Combination/
Barbeque(KOC-9N7T7SA2 ONLY)
POWER SELECTIONS 10 LEVELS
CAVITY VOLUME 1.0 Cu. Ft
* SPECIFICATION ARE SUBJECT TO CHANGE WITHOUT NOTICE.
2. SPECIFICATIONS
4
3. EXTERNAL VIEW
542
329
514.1
1. OUTER DIMENSION
1)KOC-9N4T/9N5T
2)KOC-9N7T
5
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-9N7T7SA2 ONLY)
This is used barbecue cooking.
2. FEATURE DIAGRAM
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 13 amperes, 230V, 50Hz.
Power supply cord is about 1.0 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 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 INSTR UCTIONS
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
7
5. CONTROL PANEL
11
Display : Cooking time, power level, indicators and
present time are displayed.
MW : When blinking, the oven is operating in
MICROWAVE COOK.
Grill : When blinking, the oven is operating in GRILL.
Combi : When blinking, the oven is operating in COMBI.
Defrost Weight : When blinking, the oven is operating in
WEIGHT DEFROST.
Time : When blinking, the oven is operating in TIME
DEFROST.
Auto-cook : When blinking, the oven is operating AUTO
COOK.
Lock : When lighting, the oven is CHILD LOCK.
Con-vection : When blinking, the oven is operating in
CONVECTION.
g : When blinking, the oven is operating in weight input
mode.
Barbecue : When blinking, the oven is operating in
barbecue. (KOC-9N7T7SA2 only)
22
Auto cook : Used to cook or reheat.
33
Combi : Used to select combi.
44
Weight Defrost : Press to select the weight defrosting
cooking. (KOC-9N4T7S/9N4T7S24/9N5T7S/9N5T7R/
9N5T7S21/9N7T7S/9N7T7S21 only)
Auto Defrost : Press to select the auto defrosting
cooking. (KOC-9N7T7SA2 only)
55
Grill : Used to select grill.
66
MW : Used to set power level of micro wave.
77
Time Defrost : Press to select the time defrosting
cooking. (KOC-9N4T7S/9N4T7S24/9N5T7S/9N5T7R/
9N5T7S21/9N7T7S/9N7T7S21 only)
Barbecue : Press to select the barbecue cooking.
(KOC-9N7T7SA2 only)
88
Convection : Used to select convection and selected
temp.
99
Clock : Used to set clock.
00
Dial knob : Used to set time, weight and quantity.
qq
START/SPEEDY COOK : Used to start a programmed,
also for speedy start(each press adds 30 seconds
microwave cooking time).
ww
STOP/CLEAR : Used to stop the oven operation or to
delete the cooking data.
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 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
10
A10 A09 A08 A07
A06A05
A04
A03
A02
A01
A11
A12
A13
REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK
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
3517007120 BARRIER-SCREEN *O GLASS T3.2 1
3517007130 BARRIER-SCREEN *O GLASS T3.2 MIRROR 1 KOC-9N4T7S24 ONLY
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
3. To remove door parts.
1) KOC-9N4T/9N5T
(1) Remove the gasket door from door plate.
(2) Remove the door frame from door plate.
(3) Remove screws from door frame.
(4) Remove the handle from door frame.
(5) Remove the decorator door from door frame.
(6) Remove the stopper hinge top from door plate.
(7) Remove the spring and the hook.
(8) Remove barrier screen outer from door frame.
(9) Reverse the above steps for reassembly.
✔ 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
11
REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK
A01 3511614600 DECORATOR DOOR STS430 T0.5 H/L 1
A02 3512209200 FRAME DOOR ABS XR-401 SR-0320 1
A03 3517007120 BARRIER-SCREEN*O TEMP GLASS T3.2 1
A04 3515204900 STOPPER HINGE*T AS SCP-1 T2.0 1
A05 3516602200 DOOR PLATE SBHG-3A T0.7 1
A06 3512302410 GASKET DOOR LU POL 2300 1
A07 3513101200 HOOK POM 1
A08 3515102300 SPRING HOOK PW1 1
A09 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 2
A10 3512606010 HANDLE DOOR ABS SG-0760D SG-175 1
2) KOC-9N7T
(1) Remove the gasket door from door plate.
(2) Remove the door frame from door plate.
(3) Remove screws from door frame.
(4) Remove the handle from door frame.
(5) Remove the decorator door from door frame.
(6) Remove the stopper hinge top from door plate.
(7) Remove the spring and the hook.
(8) Remove barrier screen outer from door frame.
(9) Reverse the above steps for reassembly.
✔ 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
12
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.
13
5. T o remove control panel parts.
1) KOC-9N4T7S,9N4T7S24
REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK
B01 3513406330 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 3516909080 BUTTON FUNCTION-A ABS SG-175 SG-0760D SPRAY 1
B07 71222401211 SCREW TAPPING T2S TRS 4*12 MFZN 4
B08 PKMPMSA200 PCB MAIN AS KOC-9N4T7S 1
B09 7121301011 SCREW TAPPING T2S PAN 3*10 MFZN 5
B10 PKBPMSA200 PCB SUB AS KOC-9N4T7S 1
B11 3516909090 BUTTON FUNCTION-B ABS SG-175 SG-0760D SPRAY 1
B01 B02 B03 B04 B05 B06
B07B08B09B10B11
(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.
✔ 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
14
2) KOC-9N5T7S,9N5T7R,9N5T7S21
REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK
B01 3513406330 KNOB VOLUME ABS SG-175 SG-0760D 1
B02 3515501820 WINDOW DISPLAY PMMA 1
B03 3511608110 DECORATOR C-PANEL SUS430 T0.5 H/L 1
B04 3516005600 SPECIAL DOUBLE TAPE HOSTIC 550M(D)TO.15 1
B05 3516725260 CONTROL-PANEL ABS XR-401 SG-0320G 1
B06 3516909080 BUTTON FUNCTION-A ABS SG-175 SG-0760D SPRAY 1
B07 71222401211 SCREW TAPPING T2S TRS 4*12 MFZN 4
PKMPMSA200 PCB MAIN AS KOC-9N4T7S 1
KOC-9N5T7S,
B08 9N5T7S21
PKMPMSA220 PCB MAIN AS KOC-9N5T7R 1 KOC-9N5T7R
B09 7121301011 SCREW TAPPING T2S PAN 3*10 MFZN 5
B10 PKBPMSA200 PCB SUB AS KOC-9N4T7S 1
B11 3516909090 BUTTON FUNCTION-B ABS SG-175 SG-0760D SPRAY 1
(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.
✔ 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
Loading...