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S/M No. :
Service Manual
Microwave Oven
Model: KOC-9Q3T7S
KOC-9Q4T7S
KOC-9Q4T7WA9
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).
Mar. 2010
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.....................................................................................................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
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.
(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.
2
2. SPECIFICATIONS
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.
3
3. EXTERNAL VIEW
1. OUTER DIMENSION
1) KOC-9Q3T7S
513 382
311
2) KOC-9Q4T7S / 9Q4T7WA9
513 383
311
4
2. FEATURE DIAGRAM
2 3 4 5 6 7 8
1
9
13 12 11 10
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.
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
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