Daewoo KOC-984T2S13 Service Manual
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Daewoo KOC-984T2S13 Service Manual

Daewoo KOC-984T2S13 Service Manual

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Service Manual

Microwave Oven

Model: KOC-984T2S13
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).
DAEWOO ELECTRONICS CO., LTD.
S/M NO. : C984T2S132
http://svc.dwe.co.kr

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Summary of Contents for Daewoo KOC-984T2S13

  • Page 1: Microwave Oven

    : 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). DAEWOO ELECTRONICS CO., LTD. http://svc.dwe.co.kr...

  • Page 2: Table Of Contents

    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 micro- wave source, and make repairs as 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.

  • Page 3: 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 4: Specifications

    SPECIFICATIONS MODEL KOC-984T2S13 POWER SUPPLY 240V-50Hz MICROWAVE 1450 W GRILL 1200W POWER CONSUMPTION CONVECTION 1550W PROGRAM COOK 1850W COMBINATION 1550W (Sequential) MICROWAVE ENERGY OUTPUT 1000W (IEC705) MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 526 X 345 X 496 mm (20.7 X 13.6 X 19.5 inch) CAVITY DIMENSIONS (W X H X D) 335 X 250 X 339 mm (13.2 X 9.8 X13.3 inch)

  • Page 5: External View

    EXTERNAL VIEW 1. OUTER DIMENSION...

  • Page 6: Feature Diagram

    2. FEATURE DIAGRAM 1 Door seal—Door seal maintains the microwave ener- 6 Safety interlock system gy within the oven cavity and prevents microwave leak- 7 Control panel age. 8 Turntable tray—Rotates during cooking and ensure 2 Door hook—When the door is closed, it will automati- even distribution of Microwaves.

  • Page 7: 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 8: Control Panel

    CONTROL PANEL When blinking, the oven is When binking, the oven is operating in “COMBI” cook- operating in “WEIGHT ing mode. DEFROST” cooking mode. When blinking, the oven is When blinking, the oven is operating in “GRILL” cook- operating in “TIME ing mode.

  • Page 9: 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 10 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 11 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 12 5. To remove magnetron 1) Remove three screws which secure the magnetron. 2) Remove the magnetron. 3) Reverse the above steps for reassembly. CAUTION : Never install the magnetron without the metallic gasket plate which is packed with each magnetron to prevent microwave leakage.
  • Page 13  Caution: In this Service 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) 6. To remove control panel assembly (1) Remove a screw which secure the control panel assembly to the oven front plate.
  • Page 14  Caution: In this Service 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) 7. To remove door assembly 1) Remove two screws which secure the stopper hinge top.
  • Page 15 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 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. 11.
  • Page 17 12. To remove convection part assembly 1) Remove cover *b and cover insulator *b protecting convection part assembly. - release two lances of cover insulator *b. 2) Remove four screws which secure the convection part assembly to the cavity rear plate. 3) Remove a nut holding the convection fan and the pipe.

  • 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: Trouble Shooting Guide

    TROUBLE SHOOTING GUIDE Following the procedures below to check if the oven is defective or not. 1. Check grounding before checking trouble. 2. Be careful of the high voltage circuit. 3. Discharge the high voltage capacitor. 4. When checking the continuity of the switches, fuse or high voltage transformer, disconnect one lead wire from these parts and check continuity with the AC plug removed.
  • Page 20 Condition Check Result Cause Remedy Outlet has Check continuity of Defective magnetron Replace proper voltage. magnetron Continuity Fuse does not blow. Check continuity of Defective noise filter Replace noise filter board Continuity board Open power supply Check continuity of Replace Continuity cord power supply cord...
  • Page 21 (TROUBLE 3) No microwave oscillation even though fan motor rotates. Condition Check Result Cause Remedy Check continuity microwave of high voltage Continuity oscillation fuse Replace high voltage fuse Check continuity Continuity Defective high Replace of high voltage voltage capacitor transformer terminals with wires removed Check continuity of...
  • Page 22 (TROUBLE 4) Display shows all figures selected, but oven does not start cooking, even though desired program and time are set and start pad is tapped. Condition Check Result Cause Remedy Fan motor, turn Check continuity of Malfunction of primary Adjust or table motor primary interlock...
  • Page 23 (TROUBLE 4) The following visual conditions indicate a probable defective touch control circuit or button P.C.B. assembly. 1. Incomplete segments (1) Segments missing (2) Partial segments missing (3) Digit flickering other than normal fluorescent slight flickering (4) 0 does not display when power is on. 2.
  • Page 24 BUTTON KEYBOARD CHECK PROCEDURE 1. Type of button names key matrix and circuit diagram The tact switch keyboard consists of 10 keys which configurations are described above. 2. Key check procedure To determine if the tact switch keyboard is defective or not, check the continuity of each button(key) contacts with a multimeter.

  • Page 25: 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 with the microwave oven supplied at rated voltage and operated at its maximum microwave power setting with a load of 1000±5cc of potable water.

  • Page 26: Electrical Continuity Check Of Interlock Switch

    2. ELECTRICAL CONTINUITY CHECK OF INTERLOCK SWITCH NOTE : Remove the power plug from the wall 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 27: Microwave Radiation Test

    3. MICROWAVE RADIATION TEST WARNING : Make sure to check the microwave leakage before and after repair of adjustment. Always start measuring of an unknown field to assure safety for operating personnel from microwave energy. Do not place your hands into any suspected microwave radiation field unless the safe density level is known. Care should be taken not to place the eyes in direct line with the source of microwave energy.

  • Page 28: Component Test Procedure

    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. • Before touching any oven components or wiring, always unplug the oven from its power source and discharge the capacitor.

  • Page 29: Wiring Diagram

    WIRING DIAGRAM...

  • Page 30: Schematic Diagram

    SCHEMATIC DIAGRAM...

  • Page 33: Exploded Views And Parts List

    EXPLODED VIEWS AND PARTS LIST...
  • Page 34  Caution: In this Service 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) REF NO PART CODE PART NAME DESCRIPTION...
  • Page 35  Caution: In this Service 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) REF NO PART CODE PART NAME DESCRIPTION...

  • Page 36: Printed Wiring Board

    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) : 230VAC/50Hz KOC-984T2S13 L.V.T. : DMR-984FS Terminal Voltage 1 - 3 230VAC/50Hz 6 - 7 10.5 VAC...
  • Page 37 3. Display Problems CAUSE MEASUREMENT RESULT REMEDY Poor contact between P.C.B. Check the voltage of display 2.6 VAC Fix the pin 1&25 and display filament pin 1&25 on the P.C.B. The display has some trouble Refer to the display trouble Replace P.C.B.
  • Page 38 4. Case of no microwave oscillation (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-984T2S13 Q7 KRC106M G5G-1A-DT 1N4148 MAGNETRON •...
  • Page 39 5. Case of no heating of upper heater 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-984T2S13 Q8 KRC106M G5G-1A-DT 1N4148 UPPER HEATER •...
  • Page 40 7. Case of no stopping of the count down timer When the door is opened during operation, the count down timer does not stop. KOC-984T2S13 YW396-02V 4.7K 4.7K D.O.M 100K 4.7K • Check method STAGE POINT A POINT B Door opened...

  • Page 41: Circuit Diagram

    P.C.B CIRCUIT DIAGRAM...
  • Page 42 In this Service 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) KOC-984T2S13 PCB ASS’Y PART LIST NAME...
  • Page 43 DAEWOO ELECTRONICS CO., LTD. 686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX: DWELEC K28177-8 CABLE: “DAEWOOELEC” S/M NO. : C984T2S132 PRINTED DATE: Aug. 2002...

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