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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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