Service Manuals, User Guides, Schematic Diagrams or docs for : Daewoo Micro Wave KOC-9A4T oc__9a4t7_001_184

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                      S/M No. : OC9A4T7001




 Service Manual
 Microwave Oven
 Model: KOC-9A4T7S




 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




                                             June. 2006
       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.....................................................................................................17
8. TROUBLE SHOOTING GUIDE ..................................................................................................................................18
9. MESUREMENT AND TEST .......................................................................................................................................23
  9-1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ........................................................................23
  9-2. MICROWAVE RADIATION TEST ....................................................................................................................24
  9-3. COMPONENT TEST PROCEDURE................................................................................................................25
  9-4. COMPONENT ACTION....................................................................................................................................26
10. WIRING DIAGRAM...................................................................................................................................................27
11. EXPLODED VIEW AND PARTS LIST .....................................................................................................................28
  11-1. DOOR ASSEMBLY.........................................................................................................................................28
  11-2. CONTROL PANEL ASSEMBLY.....................................................................................................................28
  11-3. TOTAL ASSEMBLY........................................................................................................................................28
12. PRINTED CIRCUIT BOARD ....................................................................................................................................31
13. P.C.B CIRCUIT DIAGRAM.......................................................................................................................................36




                                                                                     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.
      (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
2. SPECIFICATIONS
 MODEL                                        KOC-9A4T7S
 POWER SUPPLY                                 230V~50Hz, SINGLE PHASE WITH EARTHING
                           MICROWAVE          1450W
 POWER                     GRILL              1250W
 CONSUMPTION               CONVECTION         2650W
                           COMBINATION        2950W
 MICROWAVE ENERGY OUTPUT                      900W (IEC 705)
 MICROWAVE FREQUENCY                          2450MHz
 OUTSIDE DIMENSIONS (W X H X D)               542X329X520mm(21.3X13.0X20.5 in.)
 CAVITY DIMENSIONS (W X H X D)                350X230X355mm(13.8X9.1X14.0 in.)
 NET WEIGHT                                   Approx. 19Kg (41.9 lbs.)
 TIMER                                        60 minutes
 FUNCTION SELECTIONS                          Microwave / Grill / Convection / Combination
 POWER SELECTIONS                             10 LEVELS
 CAVITY VOLUME                                1.0 Cu. Ft
* SPECIFICATION ARE SUBJECT TO CHANGE WITHOUT NOTICE.




                                             3
3. EXTERNAL VIEW
1. OUTER DIMENSION




                     542         520




                           329




                           4
2. FEATURE DIAGRAM



                               2                              34                      56




                                                                                                                      7
  1




                               e              w              q 09 8

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.




                                                              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
    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.




EARTHING INSTRUCTIONS
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.


    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
5. CONTROL PANEL

                       1 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.



                       2 Auto cook : Used to cook or reheat.




                       3 Combi : Used to select combi.
                       4 Weight Defrost : Used to defrost foods.

                       5 Grill : Used to select grill.



                       6 MW : Used to set power level of micro wave.
                       7 Time Defrost : Used to defrost foods.

                       8 Convection : Used to select convection and
                         selected temp.



                       9 Clock : Used to set clock.



                       q START/SPEEDY COOK : Used to start a
                         programmed, also for speedy start(each press adds
                         30 seconds microwave cooking time).


                       w STOP/CLEAR : Used to stop the oven operation or
                         to delete the cooking data.



                       0 Dial knob : Used to set time, weight and quantity.



                         Note : Please remove the protection film on the control
                                panel before using the oven first time




                   7
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
 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).


3. To remove door parts.




 REF NO.       PART CODE              PART NAME                          DESCRIPTION                       Q'TY     REMARK
   A01         3511614610        DECORATOR DOOR                  STS430 T0.5                                1
   A02         3512209220        FRAME DOOR                      ABS XR-401 SR-0320                         1
   A03         3517009900        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         7001401211        SCREW MACHINE                   PAN M4XL12 MFZN                            2
   A10         3512606020        HANDLE DOOR                     AL                                         1
   A11         3511615600        DECORATOR BADGE                 SUS 55mm                                   1

(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.




                                                              10
4. Method to reduce the gap between the door seal and the oven front surface.
  (1) To reduce gap located on part `A'.
      



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