Daewoo KOC-984T Service Manual
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Daewoo KOC-984T Service Manual

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S/M No. : C972T0S002
Service Manual
Microwave Oven
Model: KOC-984T
DAEWOO ELECTRONICS CO., LTD.

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Summary of Contents for Daewoo KOC-984T

  • Page 1 S/M No. : C972T0S002 Service Manual Microwave Oven Model: KOC-984T DAEWOO ELECTRONICS CO., LTD.

  • Page 2: Safety And Precautions

    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.

  • Page 3: Specifications

    SPECIFICATIONS M O D E L KO C -984T P O W E R S U P P LY 230V ~50H z M IC RO W AVE 1450W G R ILL 1200W C O N VE C T IO N 1550W P O W E R C O N SU M PT IO N P R O G R A M C O O K...

  • Page 4: External View

    EXTERNAL VIEW KOC-984T...
  • Page 5 EXTERNAL VIEW KOC-984T 1. Door seal - Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage. 2. Door hook - When the door is closed, it will automatically shut. If the door is opened while the oven is operating, the magnetron will immediately stop operating.

  • Page 6: Installation

    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.

  • Page 7: Control Panel

    CONTROL PANEL When blinking, the oven is When blinking, the oven is operating in "COMBI" operating in "WEIGHT cooking mode. DEFROST" cooking mode. When blinking, the oven is When blinking, the oven is operating in "GRILL" operating in "TIME cooking mode. DEFROST"...

  • Page 8: Disassembly And Assembly

    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.

  • Page 9: To Remove Cabinet

    DISASSEMBLY AND ASSEMBLY 1. To remove cabinet (1) Remove four screws on cabinet back. (2) Push the cabinet backward. 2. To remove guide wind assembly (1) Remove two screws for earthing and for fixing to rear-plate. (2) Remove the noise filter from the guide wind. (3) Pull the fan from the motor shaft.

  • Page 10: To Remove H.v.transformer

    DISASSEMBLY AND ASSEMBLY 3. To remove H.V.transformer (1) Remove four screws which secure the H.V.transformer to the base plate. (2) Remove the H.V.transformer. (3) Reverse the above steps for reassembly. 4. To remove high voltage capacitor (1) Remove a screw which secure the grounding ring terminal of the H.V.

  • Page 11: To Remove Magnetron

    DISASSEMBLY AND ASSEMBLY 5. To remove magnetron (1) Remove three screws which secure the magnetron. (2) Remove the magnetron. (3) Reverse the above steps for reassembly. CAUTION N ever install the m agnetron w ithout the m etallic gasket plate which is packed w ith each m agnetron to prevent m icrow ave leakage.
  • Page 12 DISASSEMBLY AND ASSEMBLY (1) Remove a screw which secure the control panel assembly to the oven front plate. At the same time, draw forward the control panel assembly from the oven front plate. (2) Remove the dial knob. (3) Remove ten screws which secure the main and sub PCB assembly to control panel.

  • Page 13: To Remove Door Assembly

    DISASSEMBLY AND ASSEMBLY 7. 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 steps for reassembly. NOTE A fter replacing the door assem bly, perform a check of correct alignm ent with the hinge and cavity front plate.
  • Page 14 3511603300 DECORATOR DOOR *U STS304 T0.6 H/L 3515203600 STOPPER HINGE *T AS KOC-970T 3512602400 HANDLE DOOR *T AS ABS XR-401 WOOD GRAIN KOC-984T 3512602300 HANDLE DOOR *U ABS XR-401 7621300811 SCREW TAPPING T2S PAN 3x8 MFZN 7122401211 SCREW TAPPING T2S TRS 4x12 MFZN...

  • Page 15: Method To Reduce The Gap Between The Door Seal And The Oven Front Surface

    DISASSEMBLY AND ASSEMBLY 9. 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. •...
  • Page 16 DISASSEMBLY AND ASSEMBLY 10. To remove motor syncro and under heater (1) Cut the syncro motor cover parts from the base plate. (2) Remove two screws which secure the motor syncro and supporter to bracket syncro motor. (3) Remove two screws and under heater assembly in cavity...
  • Page 17 DISASSEMBLY AND ASSEMBLY (1) Remove two screws which secure the cover insulator *t to top plate. (2) Remove the harness between heaters. (3) Remove two screws for removing heater brackets. (4) Remove heaters. (5) Reverse the above steps for reassembly. 12.

  • Page 18: Interlock Mechanism And Adjustment

    INTERLOCK MECHANISM AND ADJUSTMENT The door lock mechanism is a device which has been specially designed to completely eliminate microwave radiation when the door is opened during operation, and thus to perfectly prevent the danger resulting from the leakage of microwave. 1.

  • Page 19: Measurement And Test

    MEASUREMENT AND TEST 1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT Microwave output power can be checked by indirectly measuring the temperature rise of a certain amount of water exposed to the microwave as directed below. PROCEDURE 1. Microwave power output measurement is made wit the microwave oven supplied at rated voltage and operated at its maximum microwave power setting with a load of 1000 ±...

  • Page 20: Electrical Continuity Check Of Interlock Switch

    MEASUREMENT AND TEST 2. ELECTRICAL CONTINUITY CHECK OF INTERLOCK SWITCH NOTE R em ove the pow er plug from the w all receptacle before testing. PROCEDURE 1. Primary interlock switch (1) Disconnect two connectors from primary interlock switch. (2) Connect the ohm-meter leads between the terminals of the primary interlock switch. 2.

  • Page 21: Microwave Radiation Test

    MEASUREMENT AND TEST 3. MICROWAVE RADIATION TEST WARNING M ake sure to check the m icrow ave leakage before and after repair of adjustm ent. A lw ays start m easuring of an unknow n field to assure safety for operating personnel from m icrow ave energy. D o not place your hands into any suspected m icrow ave radiation field unless the safe density level is know n.

  • Page 22: Component Test Procedure

    MEASUREMENT AND TEST 4. COMPONENT TEST PROCEDURE • High voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle. • It is neither necessary nor advisable to attempt measurement of the high voltage. •...

  • Page 23: Wiring Diagram

    WIRING DIAGRAM...

  • Page 24: Schematic Diagram

    SCHEMATIC DIAGRAM        ...
  • Page 25 SCHEMATIC DIAGRAM         ...
  • Page 26 SCHEMATIC DIAGRAM     ...

  • Page 27: Exploded Views And Parts List

    EXPLODED VIEWS AND PARTS LIST EXPLODED VIEW...

  • Page 28: Parts List

    EXPLODED VIEWS AND PARTS LIST PARTS LIST REF NO. PART CODE PART NAME DESCRIPTION REMARK 3511708380 DOOR AS KOC-984T PKCPSWYB00 CONTROL-PANEL AS KOC-984T(SIMULTANEOUS) 3518904400 THERMOSTAT 120/60, #187 7121400611 SCREW TAPPING T2S PAN 4*6 MFZN 7112400811 SCREW TAPPING T1 TRS 4X8 MFZN...
  • Page 29 EXPLODED VIEWS AND PARTS LIST REF NO. PART C ODE PART NAM E DESC RIPTION RE MARK F 33 7S 422X4081 S CR E W S P E C IA L T T 2 T R S 4*8 S E M F Z N F 34 3517502700 P RO T E CT O R H E ATE R...

  • Page 30: Printed Wiring Board

    1. CIRCUIT CHECK PROCEDURE 1. Low Voltage Transformer check • The low voltage transformer is located on the P.C.B. • Measuring condition (input voltage) : 230 VAC / 50 Hz KOC-984T L.V.T. : DMR -984FS Term inal Voltage 1 - 3...
  • Page 31 PRINTED WIRING BOARD 3. Display Problems CA USE MEASUREME NT RESULT R EMEDY P oor contact betw een C heck the voltage of display pin 1 & 2.6 VA C Fix the pin 1 & P.C.B . and display 25 on the P.C .B . filam ent T he display has som e R efer to T he display trouble...
  • Page 32 (1) Situation : When touching M/W button, oven lamp turns on, fan motor and turntable motor rotate and cook indicator in the display comes on. • CAUSE : Relay 1 (RY1) does not operate. KOC-984T • Check method STAGE POIN T A...
  • Page 33 When touching TEMP COOK & COMBI button, oven lamp turns on, fan motor and turntable motor rotate and cook indicator in the display comes on. • CAUSE : Relay 2 (RY2) does not operate. KOC-984T • Check method STAGE POINT A...
  • Page 34 PRINTED WIRING BOARD 7. Case of no stopping of the count down timer When the door is opened during operation, the count down timer does not stop. KO C-984T • Check method STAGE POIN T A POINT B D oor opened O pen +5 V D C D oor closed...

  • Page 35: Circuit Diagram

    P.C.B. CIRCUIT DIAGRAM...
  • Page 36 P.C.B. CIRCUIT DIAGRAM PCB ASS’Y PART LIST Q ′ ′ ′ ′ TY N AM E SYM B OL SPEC IFC ATIO N PAR T C OD E M218 93X213 3514314980 M219 91.5X163 3514314990 BUZZER BM-20K 3515600100 CONNECTOR WAFER 35312-0310 30166M5030 CONNECTOR WAFER 35313-0210...

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