Daewoo KOC-621Q0S Service Manual
  1. Manuals
  2. Brands
  3. Daewoo Manuals
  4. Microwave Oven
  5. KOC-621Q0S
  6. Service manual
Daewoo KOC-621Q0S Service Manual

Daewoo KOC-621Q0S Service Manual

Hide thumbs Also See for KOC-621Q0S:
Table of Contents

Advertisement

Quick Links

Download this manual
S/M NO. : C621Q0S001
Service Manual

Microwave Oven

Model: KOC-621Q0S
DAEWOO ELECTRONICS CO., LTD.
http://svc.dwe.co.kr
Dec. 2001

Advertisement

Table of Contents
loading

Related Manuals for Daewoo KOC-621Q0S

Summary of Contents for Daewoo KOC-621Q0S

  • Page 1: Microwave Oven

    S/M NO. : C621Q0S001 Service Manual Microwave Oven Model: KOC-621Q0S DAEWOO ELECTRONICS CO., LTD. http://svc.dwe.co.kr Dec. 2001...

  • 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 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) 470X285X376mm (18.5X11.2X14.8 in.) CAVITY DIMENSIONS (W X H X D) 295X167X300mm (11.6X6.6X11.8 in.)

  • 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 BUTTONS 1. m/w - Press to select microwave power level. 2. defrost - Press to select weight/time defrost mode. 3. grill - Press to select grill. 4. combi - Press to select combi cooking mode. 5. temp - Press to select temperature. 6.

  • Page 8: 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 9 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 10 (1) Remove the gasket door(A06) from door plate. (2) Remove the door frame (A01) from door plate(A04). (3) Remove the stopper hinge top(A03) from door plate(A04). (4) Remove the spring(A08) and the hook(A07). (5) Remove the barrier screen outer(A02) from door frame(A01). (6) Reverse the above steps for reassembly.
  • Page 11 5. To remove control panel parts. REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK 3518523500 SWITCH MEMBRANE KOC-621Q0S 3516715810 CONTROL-PANEL 3514325720 PCB AS KOC-621Q0S 7112401211 SCREW TAPPING T1 TRS 4X12 MFZN (1) Remove four screws(B04) which secure the PCB AS(B03).
  • Page 12 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 13 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 14 REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 3511409700 COVER INSU *T AS KOC-621Q0S 3512513110 GUIDE AIR OUTLET SA1D-80 T0.5 7392500011 NUT HEX 6N-2-5 MFZN 7392500011 NUT HEX 6N-2-5 MFZN 3512803300 HEATER...
  • Page 15 11. To remove Motor synchro. And Under heater assembly parts. CUTTING (8EA) REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK 7122400811 SCREW TAPPING T2S TRS 4*8 MFZN 7113400814 SCREW TAPPING T1 BIN 4*8 MFNI 3512802000 HEATER *U 230V 400W R1837400 3515304000 SUPPORTER HEATER STS430 T0.5...

  • Page 16: 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 17: 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 18 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 19 TROUBLE 3) No microwave oscillation even though fan motor rotates. CONDITION CHECK RESULT CAUSE REMEDY Check continuity of Replace Defective continuity microwave high voltage fuse high voltage oscillation fuse No microwave oscillation Continuity Check continuity of Defective high voltage capacitor terminals high voltage with wires removed transformer...
  • Page 20 (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 21 (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 22 (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 23: 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 24: 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 25: 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 26: Component Action

    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 27: Wiring Diagram

    10. WIRING DIAGRAM...

  • Page 28: 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 29 PART NAME DESCRIPTION PART CORD Q'TY DOOR AS KOG-62150S 3511709210 CONTROL-PANEL AS KOC-621Q0S 3516726550 CABINET AS KOC-621Q0S 3510806710 SCREW TAPPING T1 TRS 4*10 MFZN 7112401011 SENSOR TEMPERATURE PTM-K312-D7 3514801400 SCREW TAPPING T1 TRS 4*10 MFZN 7112401011 SCREW TAPPING T2S TRS 4*12 MFZN...

  • Page 30: 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 31 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 32 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 33 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 34: Circuit Diagram

    13. P.C.B. CIRCUIT DIAGRAM...
  • Page 35 PCB ASS’Y PART LIST NAME SYMBOL SPECIFCATION PART CODE Q'TY BUZZER BM-20K 3515600100 CAPACITOR CERAMIC C1,C3,C8,C9,C13 104 50V Z AXIAL CCZF1H104Z CAPACITOR CERAMIC C11,C12 473 50V Z AXIAL CCZF1H473Z C ARRAY 1000pF, 2.54MM CN4XB-102M CAPACITOR ELECTRO 10V RSS 470uF CEXF1A471V CAPACITOR ELECTRO 25V RSS 470uF CEXF1E471V...
  • Page 36 DAEWOO ELECTRONICS CO., LTD. 686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX: DWELEC K28177-8 CABLE: “DAEWOOELEC” http://www.daewoo.co.kr S/M NO.:C621Q0S001 PRINTED DATE: DEC. 2001...

This manual is also suitable for:

Koc-624s1lKoc-621s1lKoc-628s1lKoc-910k0sKoc-911k0sKoc-910k0s01 ... Show all

Table of Contents