Daewoo KOC-9Q3T7S, KOC-9Q4T7S, KOC-9Q4T7WA9 Service Manual
Service Manual
Microwave Oven
Model: KOC-9Q3T7S
KOC-9Q4T7S
KOC-9Q4T7WA9
S/M No. :
Mar. 2010
✔Caution
: In this Manual, some parts can be changed for improving,
their performance without notice in the parts list. So, if you
need the latest parts information, please refer to PPL(Parts
Price List) in Service Information Center (http://svc.dwe.co.kr).
1
PRECA UTIONS T O BE OBSERVED BEFORE AND
DURING SER VICING T O AV OID POSSIBLE
EXPOSURE T O 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.....................................................................................................19
8. TROUBLE SHOOTING GUIDE..................................................................................................................................20
9. MESUREMENT AND TEST .......................................................................................................................................25
9-1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT........................................................................25
9-2. MICROWAVE RADIATION TEST....................................................................................................................26
9-3. COMPONENT TEST PROCEDURE................................................................................................................27
9-4. COMPONENT ACTION....................................................................................................................................28
10. WIRING DIAGRAM...................................................................................................................................................29
11. EXPLODED VIEW AND PARTS LIST ..................................................................................................................30
11-1. DOOR ASSEMBLY.........................................................................................................................................30
12-2. CONTROL PANEL ASSEMBLY.....................................................................................................................30
13-3. TOTAL ASSEMBLY........................................................................................................................................30
12. PRINTED CIRCUIT BOARD ....................................................................................................................................31
13. P.C.B CIRCUIT DIAGRAM.......................................................................................................................................38
2
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 PR OCEDURES.
1. If the oven is operative prior to servicing, a microwave emission check should be performed prior to servicing the
oven.
2. If any certified oven unit is found to servicing, a microwave emission check should be performed prior to servicing the
oven.
(a) inform the manufacturer, importer or assembler,
(b) repair the unit at no cost to the owner,
(c) attempt to ascertain the cause of the excessive leakage,
(d) tell the owner of the unit not to use the unit until the oven has been brought into compliance.
3. If the oven operates with the door open, the service person should tell the user not to operate the oven and contact
the manufacturer immediately.
IMPORTANT
The wire in this mains lead coloured in accordance with the following code.
Green-and-yellow : Earth
Blue : Neutral
Brown : Live
As the colours of the wires in the mains lead of this appliance may not correspond with the coloured markings
identifying the terminals in your plug, proceed as follows.
The wire which is coloured green-and-yellow must be connected to the terminal in the plug which is marked with the
letter ‘E’ or by earth symbol or green-and-yellow.
The wire which is coloured blue must be connected to the terminal which is marked with the letter ‘N’ or coloured
black.
The wire which is coloured brown must be connected to the terminal which is marked with the letter ‘L’ or coloured
red.
NOTE : This oven is designed for counter-top use only.
3
MODEL KOC-9Q3T7S
POWER SUPPLY 230V~50Hz, SINGLE PHASE WITH EARTHING
MICROWAVE 1400W
POWER GRILL 1250W
CONSUMPTION CONVECTION 1250W
COMBINATION 2700W
MICROWAVE ENERGY OUTPUT 900W (IEC 705)
MICROWAVE FREQUENCY 2450MHz
OUTSIDE DIMENSIONS (W X D X H) 513X382X311mm(20.2X15X12.2 in.)
CAVITY DIMENSIONS (W X D X H) 354X341X231mm(13.9X13.4X9.1 in.)
NET WEIGHT Approx. 16.6Kg (46.6 lbs.)
TIMER 60 minutes
FUNCTION SELECTIONS Microwave / Grill / Convection / Combination
POWER SELECTIONS 10 LEVELS
CAVITY VOLUME 0.99 Cu. Ft
* SPECIFICATION ARE SUBJECT TO CHANGE WITHOUT NOTICE.
MODEL KOC-9Q4T7S / 9Q4T7WA9
POWER SUPPLY 230V~50Hz, SINGLE PHASE WITH EARTHING
MICROWAVE 1400W
POWER GRILL 1250W
CONSUMPTION CONVECTION 1250W
COMBINATION 2700W
MICROWAVE ENERGY OUTPUT 900W (IEC 705)
MICROWAVE FREQUENCY 2450MHz
OUTSIDE DIMENSIONS (W X D X H) 513X383X311mm(20.2X15.1X12.2 in.)
CAVITY DIMENSIONS (W X D X H) 354X341X231mm(13.9X13.4X9.1 in.)
NET WEIGHT Approx. 16.6Kg (46.6 lbs.)
TIMER 60 minutes
FUNCTION SELECTIONS Microwave / Grill / Convection / Combination
POWER SELECTIONS 10 LEVELS
CAVITY VOLUME 0.99 Cu. Ft
* SPECIFICATION ARE SUBJECT TO CHANGE WITHOUT NOTICE.
2. SPECIFICATIONS
4
3. EXTERNAL VIEW
382513
311
1. OUTER DIMENSION
1) KOC-9Q3T7S
383513
311
2) KOC-9Q4T7S / 9Q4T7WA9
5
1
23 45678
9
101112
13
11. DOOR HOOK
Hook automatically locks and holds the door when the door shuts. If the door opens while the oven is operating,
the oven will stop operating immediately.
12. DOOR SEAL
Door seal prevents the microwave leakage from the oven cavity.
13. DOOR VIEWING SCREEN
Food, inside of oven, can be observed through the door viewing screen. It is designed that the microwave cannot
pass through the screen.
14. TOP HEATER
Top heater turns on if any of heater related mode operates.
15. OVEN FRONT PLATE
16. CONVECTION INLET
17. OVEN LAMP
Oven lamp turns on anytime the door opens and oven operates.
18. SAFETY INTERLOCK SYSTEM
19. CONTROL PANEL
10. METAL RACK
11. COUPLER
Coupler located at the center of the oven cavity and it couples between the motor and the glass tray.
12. ROLLER GUIDE
Roller guide must be used anytime with the glass tray.
13. GLASS TRAY
Glass tray is made of special heat resistant glass material. It must be always properly fitted with the coupler and
the roller guide.
2. FEATURE DIAGRAM
6
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 1.0 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.
EARTHING INSTR UCTIONS
WARNING
Improper use of the earthing plug can result in a risk of electric shock. Consult
a qualified electrician or serviceman if the earthing instructions are not completely understood, or if doubt exists as
to whether the appliance is properly earthed, and either:
If it is necessary to use an extension cord, use only a 3-wire extension cord that has a 3-blade earthing plug, and a
3-slot receptacle that will accept the plug on the appliance.
The marked rating of the extension cord should be equal to or greater than the electrical rating of the appliance, or
Do not use an extension cord.
4. INSTALLATION
7
5. CONTROL PANEL
11
Display : Cooking time, power level, program
indicators and present time are displayed.
MW ( ): When blinking, the oven is
operating in MICROWAVE COOK mode.
Grill ( ): When blinking, the oven is
operating in GRILL mode.
Combi ( ): When blinking, the oven is
operating in COMBI mode.
Convection ( ): When blinking, the oven is
operating in CONVECTION mode.
Defrost ( ): When blinking, the oven is
operating in DEFROST mode.
Auto-cook ( ): When blinking, the oven is
operating in AUTO COOK mode.
Warm ( ): When blinking, the oven is
operating in WARM mode.
Steam Cleaning ( ): When blinking, the
oven is operating in STEAM CLEANING
mode.
gram ( ): When blinking, the oven is
operating in weight input mode.
22
Auto cook : Used to cook or reheat.
33
Defrost : Used to defrost foods.
44
MW : Used to set power level of the
microwave.
55
Grill : Used to select grill mode.
66
Combi : Used to select combi mode.
77
Convection : Used to select convection
mode and selected temp.
88
Clock : Used to set clock.
99
STEAM CLEANING : Used to clean the
inside of the oven
00
Warm : Used to keep the food warm.
qq
Dial knob : Used to set time, weight and
quantity.
ww
START/SPEEDY COOK : Used to start a
program or a speedy start(each press adds
30 seconds of microwave cooking time).
ee
STOP/CLEAR : Used to stop the oven
operation or to delete the cooking data.
1
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w
q
4
5
6
7
8
9
0
1) KOC-9Q3T7S
8
11
Display : Cooking time, power level, program
indicators and present time are displayed.
MW ( ): When blinking, the oven is
operating in MICROWAVE COOK mode.
Grill ( ): When blinking, the oven is
operating in GRILL mode.
Combi ( ): When blinking, the oven is
operating in COMBI mode.
Convection ( ): When blinking, the oven is
operating in CONVECTION mode.
Defrost ( ): When blinking, the oven is
operating in DEFROST mode.
Auto-cook ( ): When blinking, the oven is
operating in AUTO COOK mode.
Warm ( ): When blinking, the oven is
operating in WARM mode.
Steam Cleaning ( ): When blinking, the
oven is operating in STEAM CLEANING
mode.
gram ( ): When blinking, the oven is
operating in weight input mode.
22
Auto cook : Used to cook or reheat.
33
Defrost : Used to defrost foods.
44
MW : Used to set power level of the
microwave.
55
Grill : Used to select grill mode.
66
Combi : Used to select combi mode.
77
Convection : Used to select convection
mode and selected temp.
88
Clock : Used to set clock.
99
STEAM CLEANING : Used to clean the
inside of the oven.
00
Warm or Dish Warm : Used to keep the food
or dish warm.
qq
Dial knob : Used to set time, weight and
quantity.
ww
START/SPEEDY COOK : Used to start a
program or a speedy start(each press adds
30 seconds of microwave cooking time).
ee
STOP/CLEAR : Used to stop the oven
operation or to delete the cooking data.
1
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e
3
w
q
4
5
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7
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0
2) KOC-9Q4T7S / 9Q4T7WA9
9
6. DISASSEMBLY AND ASSEMBLY
- Cautions to be observed when trouble shooting.
Unlike many other appliances, the microwave oven is high-voltage, high-current equipment.
It is completely safety during normal operation. However, carelessness in servicing the oven can result in an
electric shock or possible danger from a short circuit.
You are asked to observe the following precautions carefully.
1. Always remove the power plug from the outlet before servicing.
2. Use an insulated screwdriver and ware rubber gloves when servicing the high voltage side.
3. Discharge the high voltage capacitor before touching any oven
components or wiring.
(1) Check the earthed.
Do not operate on a two-wire extension cord.
The microwave oven is designed to be used with earthed.
It is imperative, therefore, to makes sure it is earthed properly
before beginning repair work.
(2) Warning about the electric charge in the high voltage capacitor.
For about 30 seconds after the operation stopped and electric
charge remains in the high voltage capacitor. When replacing or
checking parts, short between oven chassis and the negative
high terminal of the high voltage capacitor, by using a properly
insulated 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, need a care of touching or replacing high potential parts because of
electrical shock or exposing microwave. These parts are as follows - HV Transformer, Magnetron,
HV Capacitor, HV Diode.
10
1. To remove cabinet
1) Remove five screws on cabinet back.
2) Push the cabinet backward.
2. To remove door assembly
1) Remove two screws which secure the stopper hinge top.
2) Remove the door assembly from top plate of cavity.
3) Reverse the above for assembly.
NOTE: After replacing the door assembly, perform a
check of correct alignment with the hinge and
cavity front plate.
11
A01 A03
A02
A04
A07
A08
A06A05
3. To remove door parts.
1) KOC-9Q3T7S
(1) Remove the GASKET DOOR from DOOR AS.
(2) Remove screws from DOOR AS.
(3) Remove the HANDLE DOOR from DOOR AS.
(4) Remove the DOOR-PALTE from FRAME DOOR.
(5) Remove the STOPPER HINGE *T AS from DOOR-PLATE.
(6) Remove the SPRING HOOK and the HOOK.
(7) 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
(http://svc.dwe.co.kr).
B01 3512607710 HANDLE DOOR ABS SG-0760D, SG-175 SPRAY 1
B02 3512209640 FRAME DOOR ABS XR-401 1
B03 3515204120 STOPPER HINGE *T AS KOR-6L0B1A 1
B04 3516603100 DOOR-PLATE SECC 0.5T 1
B05 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 2
B06 3512302410 GASKET DOOR LUPOL 2300 1
B07 3515101310 SPRING HOOK HSW-2 1
B08 3513101900 HOOK POM 1
REF. NO PART CODE PART NAME DESCRIPTION Q'TY
12
B01 3512607710 HANDLE DOOR ABS SG-0760D, SG-175 SPRAY 1
B02 3512209640 FRAME DOOR ABS XR-401 1
B03 3515204120 STOPPER HINGE *T AS KOR-6L0B1A 1
B04 3516603100 DOOR-PLATE SECC 0.5T 1
B05 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 2
B06 3512302410 GASKET DOOR LUPOL 2300 1
B07 3515101310 SPRING HOOK HSW-2 1
B08 3513101900 HOOK POM 1
REF. NO PART CODE PART NAME DESCRIPTION Q'TY
A01 A03
A02
A04
A07
A08
A06A05
2) KOC-9Q4T7S / 9Q4T7WA9
(1) Remove the GASKET DOOR from DOOR AS.
(2) Remove screws from DOOR AS.
(3) Remove the HANDLE DOOR from DOOR AS.
(4) Remove the DOOR-PALTE from FRAME DOOR.
(5) Remove the STOPPER HINGE *T AS from DOOR-PLATE.
(6) Remove the SPRING HOOK and the HOOK.
(7) 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
(http://svc.dwe.co.kr).
13
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.
A
B
NOTE : A small gap may be acceptable if the microwave leakage does not exceed 4mW/cm2.
14
B01 B02 B03 B04
B07B06
B05
5. To remove control panel parts.
1) KOC-9Q3T7S
(1) Pull out the KNOB DIAL from CONTROL-PANEL AS.
(2) Remove screws securing the PCB MAIN AS.
(3) Pull out the PCB MAIN AS.
(4) Pull out the BUTTON FUNCTION A and B.
(5) 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
(http://svc.dwe.co.kr).
B01 3513412110 KNOB DIAL ABS SG-0760D, SG-175 1
B02 3516737190 CONROL-PANEL ABS SG-0760D, SG-175 1
B03 3516912730 BUTTON FUNCTION-A ABS SG-0760D, SG-175 1
B04 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 4
B05 3514332650 PCB MAIN AS KOC-9Q4T7S 1
B06 7121301011 SCREW TAPPING T2S PAN 3X10 MFZN 9
B07 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 4
REF. NO PART CODE PART NAME DESCRIPTION Q'TY
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