Daewoo KOC-9N4T7S Service Manual
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Daewoo KOC-9N4T7S Service Manual

Daewoo KOC-9N4T7S Service Manual

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S/M No. : OC9N4T7001
Service Manual

Microwave Oven

Model: KOC-9N4T7S
KOC-9N4T7S24
KOC-9N5T7S
KOC-9N5T7R
KOC-9N5T7S21
KOC-9N7T7S
KOC-9N7T7S21
KOC-9N7T7SA2
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
Jun. 2005

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Summary of Contents for Daewoo KOC-9N4T7S

  • Page 1: Microwave Oven

    S/M No. : OC9N4T7001 Service Manual Microwave Oven Model: KOC-9N4T7S KOC-9N4T7S24 KOC-9N5T7S KOC-9N5T7R KOC-9N5T7S21 KOC-9N7T7S KOC-9N7T7S21 KOC-9N7T7SA2 Caution : In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you...

  • 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 KOC-9N4T7S, 9N4T7S24, MODEL KOC-9N5T7R 9N5T7S, 9N5T7S21 POWER SUPPLY 230V~50Hz, SINGLE PHASE WITH EARTHING MICROWAVE 1450W GRILL 850W POWER CONSUMPTION CONVECTION 2250W 1450W COMBINATION 2950W 1450W MICROWAVE ENERGY OUTPUT 900W (IEC 705) MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 542X329X515mm(21.3X13.0X20.3 in.)

  • Page 5: External View

    3. EXTERNAL VIEW 1. OUTER DIMENSION 1)KOC-9N4T/9N5T 2)KOC-9N7T 514.1...

  • 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.

  • 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

    2 Auto cook : Used to cook or reheat. 3 Combi : Used to select combi. 4 Weight Defrost : Press to select the weight defrosting cooking. (KOC-9N4T7S/9N4T7S24/9N5T7S/9N5T7R/ 9N5T7S21/9N7T7S/9N7T7S21 only) Auto Defrost : Press to select the auto defrosting cooking. (KOC-9N7T7SA2 only) 5 Grill : Used to select grill.

  • 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 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 3. To remove door parts. 1) KOC-9N4T/9N5T REF NO.
  • Page 12 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 2) KOC-9N7T REF NO. PART CODE PART NAME DESCRIPTION...
  • 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’. • Loosen two screws on stopper hinge top, and then push the door to contact the door seal to oven front surface. •...
  • Page 14 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 5. To remove control panel parts. 1) KOC-9N4T7S,9N4T7S24 B03 B04 REF NO.
  • Page 15 ABS XR-401 SG-0320G 3516909080 BUTTON FUNCTION-A ABS SG-175 SG-0760D SPRAY 71222401211 SCREW TAPPING T2S TRS 4*12 MFZN KOC-9N5T7S, PKMPMSA200 PCB MAIN AS KOC-9N4T7S 9N5T7S21 PKMPMSA220 PCB MAIN AS KOC-9N5T7R KOC-9N5T7R 7121301011 SCREW TAPPING T2S PAN 3*10 MFZN PKBPMSA200 PCB SUB AS...
  • Page 16 ABS SG-0760D, SG-175 3516913610 BUTTON FUNCTION-A ABS SG-175 SG-0760D SPRAY 7122401211 SCREW TAPPING T2S TRS 4*12 MFZN KOC-9N7T7S, PKMPMSA200 PCB MAIN AS KOC-9N4T7S 9N7T7S21 PKMPMSB910 PCB MAIN AS KOC-9N7T7SA2 KOC-9N7T7SA2 7121301011 SCREW TAPPING T2S PAN 3*10 MFZN PKBPMSA200 PCB SUB AS...
  • Page 17 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 18 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 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 10. To remove Top heater assembly parts. 1 2 3 4 REF NO.
  • Page 20 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 11. To remove Rear heater assembly parts. REF NO.

  • Page 21: 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 22: 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 23 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 24 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 25 (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 26 (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.

  • Page 27: 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 28: 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 29: 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 30: Component Action

    4. COMPONENT ACTION MAGNE- UPPER REAR CONVEC- COOKING MODE TRON ELEMENT ELEMENT TION FAN MANUAL GRILL MODE COMBI CONVECTION ROAST PORK ROAST BEEF AUTO ROAST CHICKEN MODE BAKED FISH FRESH VEGETABLES...

  • Page 31: Wiring Diagram

    10. WIRING DIAGRAM 1) KOC-9N4T7S,9N4T7S24,9N5T7S,9N5T7R,9N5T7S21,9N7T7S,9N7T7S21...
  • Page 32 2) KOC-9N7T7SA2...

  • Page 33: 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 34 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 PART CORD PART NAME DESCRIPTION Q'TY REMARK 3511714530 DOOR AS KOC-924T9A KOC-9N4T7S, 9N5T7S,9N5T7S21 3511725530 KOC-9N4T7S24 KOC-9N4T7S24 3511725510 KOC-9N7T7S KOC-9N7T7S, 9N7T7S,9N7T7SA2 PKCPSWA200...
  • Page 35 3512801800 HEATER 230V 1400W 1R18344 3513002300 HOLDER HEATER SUS304 T0.5 7402704600 RING C CR-5 SK5 3512780901 HARNESS MAIN KOC-9N4T7S 3516004000 SPECIAL SCREW T2 BOLT FLANGE 5X12 DACRO 3518003700 MAGNETRON 2M218JFL 6CF 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 3513601600 LAMP...
  • Page 36 PART CORD PART NAME DESCRIPTION Q'TY REMARK 3510313600 BASE SBHG T0.8 7272400811 SCREW TAPTITE TT3 TRS 4X8 MFZN 3515202800 STOPPER HINGE *U AS KOR-121M0A 7121400611 SCREW TAPPING T1 PAN 4*6 MFZN 3966031110 MOTOR SYNCRO 220/240V 50/60 SM16 HK36M6F 3514801400 SENSOR TEMPERATURE PTM-K312-D7 7112401011 SCREW TAPPING...

  • Page 37: 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 38 MEASUREPOINT...
  • Page 39 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 40 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 41 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 42: Circuit Diagram

    13. P.C.B. CIRCUIT DIAGRAM...
  • Page 43 PCB ASS’Y PART LIST PART CODE NAME SPECIFICATION Q'TY REMARK 3515600100 BUZZER BM-20K (BUJEON) 30166M7020 WAFER MOLEX 35313-0210 4CW215SBD0 CONN WAFER HLEM15S-1 1 30166M5030 WAFER MOLEX 35312-0310 (WHITE) 4CW3061MX0 CONN WAFER MOLEX 35328-0610 DSVM5MS06- DIGITRON SVM-5MS06(S/S) 3513002000 HOLDER VFD CEXF1V102V C ELECTRO 35V RSS 1000MF (13X25) TP 150S924TRV...
  • Page 44 PART CODE NAME SPECIFICATION Q'TY REMARK CCZF1H104Z C CERA HIKF 50V 0.1MF Z AXIAL CCZF1H104Z C CERA HIKF 50V 0.1MF Z AXIAL CCZF1H102Z C CERA HIKF 50V 1000PF Z AXIAL CCZF1H102Z C CERA HIKF 50V 1000PF Z AXIAL CCZF1H104Z C CERA HIKF 50V 0.1MF Z AXIAL CCZF1H104Z C CERA...
  • Page 45 PART CODE NAME SPECIFICATION Q'TY REMARK 85801052GY WIRE COPPER 1/0.52 TIN COATING 85801052GY WIRE COPPER 1/0.52 TIN COATING 85801052GY WIRE COPPER 1/0.52 TIN COATING 85801052GY WIRE COPPER 1/0.52 TIN COATING 85801052GY WIRE COPPER 1/0.52 TIN COATING 85801052GY WIRE COPPER 1/0.52 TIN COATING 85801052GY WIRE COPPER 1/0.52 TIN COATING...
  • Page 46 PART CODE NAME SPECIFICATION Q'TY REMARK RD-AZ104J- R CARBON FILM 1/6 100K OHM J RD-AZ122J- R CARBON FILM 1/6 1.2K OHM J RD-4Z689J- R CARBON FILM 1/4 6.8 OHM J1 RD-AZ104J- R CARBON FILM 1/6 100K OHM J RD-AZ104J- R CARBON FILM 1/6 100K OHM J RD-AZ102J- R CARBON FILM...
  • Page 47 DAEWOO ELECTRONICS CORP. 686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX: DWELEC K28177-8 CABLE: “DAEWOOELEC” S/M NO. : OC9N4T7001 PRINTED DATE: Jun. 2005...

This manual is also suitable for:

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