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Daewoo KOC-924T0S Service Manual

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Service Manual

Microwave Oven

Model: KOC-924T0S/925T9S
KOC-924T5S/925T5S
KOC-924T0S01/925T9S01
KOC-924T5S01/925T5S01
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 CORP.
http : //svc.dwe.co.kr
S/M No. : C924T0S004
May. 2003

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Summary of Contents for Daewoo KOC-924T0S

  • Page 1: Microwave Oven

    S/M No. : C924T0S004 Service Manual Microwave Oven Model: KOC-924T0S/925T9S KOC-924T5S/925T5S KOC-924T0S01/925T9S01 KOC-924T5S01/925T5S01 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).

  • 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 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.

  • Page 3: Safety And Precautions

    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.

  • Page 4: Specifications

    2. SPECIFICATIONS MODEL KOC-924T0S/924T0S01/925T9S/925T9S01 POWER SUPPLY 230V~50HZ, SINGLE PHASE WITH EARTHING MICROWAVE 1500W POWER GRILL 1150W CONSUMPTION CONVECTION 2550W COMBINATION 3000W MICROWAVE ENERGY OUTPUT 1000W(IEC705) MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 542X329X515mm (21.3X13.0X20.3 in.) CAVITY DIMENSIONS (W X H X D) 350X230X355mm (13.8X9.1X14.0 in.)

  • Page 5: External View

    3. EXTERNAL VIEW 1. OUTER DIMENSION 1) KOC-924T0S/924T5S/924T0S01/924T5S01 2) KOC-925T9S/925T5S/925T9S01/925T5S01...

  • Page 6: Feature Diagram

    2. FEATURE DIAGRAM 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.

  • 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

    Auto Cook - When blinking, the oven is operating in WEIGHT DEFROST - Press to select the weight AUTO COOK mode. defrosting cooking. (KOC-924T0S/924T5S only) Lock - When lighting, the oven is in CHILD LOCK AUTO DEFROST - Press to select the auto mode.

  • Page 9: Disassembly And Assembly

    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.
  • Page 10 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.
  • Page 11  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) 3. To remove door parts. REF NO.
  • Page 12 (1) Remove the gasket door from door plate. (2) Remove screws from door plate. (3) Remove the door frame from door plate. (4) Remove the stopper hinge top from door plate. (5) Remove the spring and the hook. (6) Remove the handle door and barrier screen outer from door frame. (7) Reverse the above steps for reassembly.
  • Page 13 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) 5. To remove control panel parts. 1) KOC-924T0S/924T5S/924T0S01/924T5S01 B03 B04 REF NO.
  • Page 14 ABS XR-401 SG-0320G 3516909040 BUTTON FUNCTION-A ABS SG-175 SG-0760D COAT 71222401211 SCREW TAPPING T2S TRS 4*12 MFZN 3514323740 PCB MAIN AS KOC-924T0S/KOC-924T5S 7121301011 SCREW TAPPING T2S PAN 3*10 MFZN 3514323820 PCB SUB AS KOC-924T0S/KOC-924T5S 3516909050 BUTTON FUNCTION-B ABS SG-175 SG-0760D COAT (1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly.
  • Page 15 6. To remove high voltage capacitor. 1) Remove a screw which secure the grounding ring terminal of the H.V. diode and the capacitor holder. 2) Remove the H.V. diode from the capacitor holder. 3) Reverse the above steps for reassembly. High voltage circuit wiring 7.
  • Page 16 8. To remove wind guide assembly. 1) Remove a screw for earthing. 2) Remove the noise filter from the wind guide. 3) Remove a screw which secure the wind guide assembly. 4) Draw forward the wind guide assembly. 5) Pull the fan from the motor shaft. 6) Remove two screws which secure the motor shaded pole.
  • Page 17  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) 10. To remove Top heater assembly parts. REF NO.

  • Page 18: To Remove Rear Heater Assembly Parts

    7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 3511407900 COVER*B SA1D-80 T0.5 3512767600 HARNESS CONVECTION KOC-924T0S 7113400814 SCREW TAPPING T1 BIN 4*8 MFNI 3511409800 COVER HEATER*B SA1D-80 T0.5 3513303400 INSULATOR HEATER*B SBHG-1 T0.5 7113400814...
  • Page 19  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) 12 To remove Barbecue motor syncro and Guide rotary part. REF NO.

  • Page 20: Interlock Mechanism And Adjustment

    7. 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) Primary interlock switch When the door is closed, the hook locks the oven door.

  • Page 21: Trouble Shooting Guide

    8. TROUBLE SHOOTING GUIDE Following the procedure below to check if the oven is defective or not. 1) Check grounding before trouble checking. 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 tranformer, disconnect one load wire from these parts and check continuity with the AC plug removed.
  • Page 22 CONDITION CHECK RESULT CAUSE REMEDY Defective Outlet has Check continuity of Replace continuity magnetron. proper magnetron voltage fuse does not blow? Defective line Check continuity of noise filter Replace continuity board filter board Open power Check continuity of Replace continuity supply cord power supply cord Defective touch...
  • Page 23 TROUBLE 3) No microwave oscillation even though fan motor rotates. CONDITION CHECK RESULT CAUSE REMEDY Check continuity of Replace Defective continuity high voltage fuse microwave high voltage oscillation fuse No microwave oscillation Continuity Check continuity of Defective high voltage capacitor terminals high voltage with wires removed transformer...
  • Page 24 (TROUBLE 4) Grill heater (upper heater) is not heated; food will not become hot. CONDITION CHECK RESULT CAUSE REMEDY Malfunction of Adjust or Check continuity of Grill heater is primary Interlock replace continuity primary interlock switch not heated. switch Adjust or Malfunction of Check continuity of replace...
  • Page 25 (TROUBLE 6) The following visual conditions inditions indicate a probable defective touch control Circuit or button P.C.B. assembly 1. Incomplete segments. 1) segment missing 2) partial segments missing 3) digit flickering other than normal fluorescent slight flickering 2. A distinct change in the brightness of one or more numbers exists in the display 3.

  • Page 26: Mesurement And Test

    9. 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. A cylindrical container of borosilicate glass is used for the test. It has a maximum thickness of 3mm, an external diameter of approximately 190mm and a height of approximately 90mm.

  • Page 27: Microwave Radiation Test

    2. MICROWAVE RADIATION TEST WARNING 1. Make sure to check the microwave leakage before and after repair of adjustment. 2. Always start measuring of an unknown field to assure safety for operating personnel from microwave energy. 3. Do not place your hands into any suspected microwave radiation field unless the safe density level is known. 4.

  • Page 28: Component Test Procedure

    3. 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: Component Action

    4. COMPONENT ACTION MAGNE- UPPER LOWER REAR CONVEC- COOKING MODE TRON ELEMENT ELEMENT ELEMENT TION FAN GRILL-1 GRILL-2 GRILL-3 COMBI-1 COMBI-2 MANUAL COMBI-3 MODE COMBI-4 COMBI-5 CONVECTION100~130 CONVECTION140~150 CONVECTION160~250 CAKE/BREAD TOUCH CRUSTY ROAST BEEF ROAST CHICKEN ROAST PORK BAKED FISH AUTO BAKED POTATO MODE...

  • Page 30: Wiring Diagram

    10. WIRING DIAGRAM - KOC-924T0S/924T5S/925T9S/925T5S...
  • Page 31 - KOC-924T0S01/924T5S01/925T9S01/925T5S01...

  • Page 32: Exploded View And Parts List

    11. EXPLODED VIEW AND PARTS LIST 1. DOOR ASSEMBLY Refer to 6. Disassembly and assembly. 2. CONTROL PANEL ASSEMBLY Refer to 6. Disassembly and assembly. 3. TOTAL ASSEMBLY...
  • Page 33 T1 TRS 4*10 SE MFZN 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 3511407300 COVER MOTOR*B SA1D-80 T0.5 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 3511407900 COVER*B SA1A-80 T0.5 3511800800 PP GF20 3512767600 HARNESS CONVECTION KOC-924T0S 7402704600 RING C CR-5 SK5...
  • Page 34 SA1D-80 T0.5 3512801800 HEATER 230V 1400W 1R18344 3513002300 HOLDER HEATER SUS304 T0.5 7400104011 WASHER PLAIN PW-1-4 MFZN 3512718320 HARNESS MAIN KOC-924T0S 3516004000 SPECIAL SCREW T2 BOLT FLANGE 5*12 DACR 3518002900 MAGNETRON 2M218J(F)P 7122401211 SCREW TAPPING T2S TRS 4*12 MFZN 3513601600 LAMP...

  • Page 35: Printed Circuit Board

    12. PRINTED CIRCUIT BOARD CIRCUIT CHECK PROCEDURE 1. Low voltage transformer check The low voltage transformer is located on the P.C.B. Measuring condition: Input voltage: 230V / Frequency: 50Hz Terminal Voltage(load) Voltage(no load) AC 17.0 V AC 19.9 V AC 1.3 V AC 1.6 V 9-10 AC 1.3 V...
  • Page 36 3. Case of no microwave oscillation 1) When touching M/W button, oven lamp turns on and Fan motor and turntable rotate, and cook indicator in display comes on. *Cause: RELAY 1 does not operate. STATE POINT A POINT B RELAY 1 ON +5V DC RELAY 1 OFF +24V DC...
  • Page 37 4. Case of no heating of top grill When touching GRILL or COMBI button, oven lamp turns on and fan motor and turntable rotate, and cook indicator in display comes on. *Cause: RELAY 2 does not operate. GRILL STATE POINT A POINT B RELAY 2 ON +5V DC...
  • Page 38 6. Case of no stopping of the count down timer When the door is opened during operation, the count down timer does not stop. D.O.M SW POINT STATE DOOR OPEN OPEN +5V DC DOOR CLOSED CLOSE CHECK NO METHOD REMEDY Check the stage(ON,OFF) of the door open monitor switch by resistance Replace door open monitor swith.

  • Page 39: Circuit Diagram

    13. P.C.B. CIRCUIT DIAGRAM...
  • Page 40  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) PCB ASS’Y PART LIST NAME SYMBOL SPECIFCATION...
  • Page 41 DAEWOO ELECTRONICS CORP. 686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX: DWELEC K28177-8 CABLE: “DAEWOOELEC” PRINTED DATE: May. 2003 S/M No. : C924T0S004...

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