Daewoo KOC-624Q0S Service Manual
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Daewoo KOC-624Q0S Service Manual

Daewoo KOC-624Q0S Service Manual

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Service Manual
Microwave Oven
Model: KOC-621Q0S
KOC-624Q0S
 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.
http : //svc.dwe.co.kr
S/M No. : C621Q0S002
Feb. 2002

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Summary of Contents for Daewoo KOC-624Q0S

  • Page 1 : 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 Feb. 2002...

  • 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-621Q0S, 624Q0S POWER SUPPLY 230V~50HZ, SINGLE PHASE WITH EARTHING MICROWAVE 1250W POWER GRILL 1250W CONSUMPTION OVEN 1650W COMBINATION 2500W MICROWAVE ENERGY OUTPUT 800W(IEC705) MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 470X285X356mm (18.5X11.2X14.0 in.) CAVITY DIMENSIONS (W X H X D) 295X167X300mm (11.6X6.6X11.8 in.) NET WEIGHT APPROX.

  • Page 5: Feature Diagram

    3-2. FEATURE DIAGRAM Def. Grill Temp Auto Cook 1. Roast Beef 2. Roast Pork 3. Roast Chicken 4. Fish Fillets 5. Vegetable Defrost 10m. Grill 1000g Combi 100g Temp 10s. Clock Auto Cook Stop/ Start/ Speedy cook Clear Combi KOC-621Q 11.DOOR HOOK When the door is closed, it will automatically lock shut.

  • 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

    5. CONTROL PANEL 1. KOC-621Q0S Def. Grill Temp Auto Cook 1. Roast Beef 2. Roast Pork 3. Roast Chicken 4. Fish Fillets 5. Vegetable Defrost 10m. Grill 1000g Combi 100g 10s. Temp Clock Auto Cook Start/ Stop/ Speedy cook Clear Combi KOC-621Q BUTTONS...
  • Page 8 2. KOC-624Q0S Def. Grill Temp Auto Cook 1. Roast Beef 2. Roast Pork 3. Roast Chicken 4. Fish Fillets 5. Vegetable Defrost Grill 10min. Combi 1min. Temp 10sec. Clock Auto Cook Start/ Stop/ Speedy cook Clear BUTTONS 1. m/w - Press to select microwave power level.

  • 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. •...
  • Page 12 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-624Q0S REF NO.
  • Page 13 4. Method to reduce the gap between the door seal and the oven front surface. (1) To reduce gap located on part ‘A’. Def. Grill Temp • Loosen two screws on stopper hinge top, and then push the door Auto Cook 1.
  • 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) 5. To remove control panel parts. •...
  • Page 15 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-624Q0S REF NO.
  • Page 16 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 17 8. To remove wind guide assembly. 1) Remove a screw for earthing. 2) Remove the noise filter from the wind guide. 3) Remove two screws 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 18  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 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) 11. To remove Motor synchro. And Under heater assembly parts. CUTTING (8EA) 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) Lower heater is not heated; food will not become hot. CONDITION CHECK RESULT CAUSE REMEDY Malfunction of Adjust or Check continuity of Lower heater primary Interlock Replace continuity Primary interlock switch Is not heated switch Adjust or Check continuity of Malfunction of replace secondary interlock...
  • Page 26 (TROUBLE 8) When “Err 2” or “Err 3” come on display. CAUSE REMEDY CONDITION CHECK RESULT 0Ω or infinite Replace Check continuity of thermistor Defective “Err 2” or (resistance of thermistor) thermistor “Err 3” come on display Approx 200k~300kΩ (room temperature) Defective Replace...

  • Page 27: Measurement And Test

    9. MEASUREMENT AND TEST 9-1. 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 ±...

  • Page 28: Microwave Radiation Test

    9-2. 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 29: Component Test Procedure

    9-3. 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 30: Component Action

    9-4. COMPONENT ACTION COOKING MODE MAGNETRON UPPER ELEMENT LOWER ELEMENT MANUAL MODE GRILL COMBI TEMP DEFROST AUTO ROAST BEEF COOK ROAST PORK ROAST CHICKEN FISH FILLETS VEGETABLE...

  • Page 31: Wiring Diagram

    10. WIRING DIAGRAM...

  • 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  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) PART NAME DESCRIPTION PART CORD Q'TY...

  • Page 34: 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(olad) Voltage(no load) 6-10 DC 13V DC 14V LVT1 DMR-621FS AS 230V/50Hz NOTE 1.
  • Page 35 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. 1N4148 G5G-1A-DT 12V C106M STATE POINT A POINT B RELAY 1 ON +5V DC...
  • Page 36 4. Case of no heating of upper 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 3 does not operate. UPPER 1N4148 GRILL C106M G5G-1A-DT 12V STATE...
  • Page 37 6. Case of no stopping of the count down timer When the door is opened during operation, the count down timer does not stop. 35313-0210 1N4148 104Z 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...

  • Page 38: Circuit Diagram

    13. P.C.B. CIRCUIT DIAGRAM...
  • Page 39  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 40 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. : C621Q0S002 PRINTED DATE: Feb, 2002...

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