Daewoo KOC-9N7T7S Service Manual
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Daewoo KOC-9N7T7S Service Manual

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Microwave Oven
Model : KOC-9N7T7S
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.
S/M No : C9N7T7S001
JAN . 2005

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Summary of Contents for Daewoo KOC-9N7T7S

  • Page 1 S/M No : C9N7T7S001 Microwave Oven Model : KOC-9N7T7S 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.

  • 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-9N7T7S POWER SUPPLY 230V~50Hz, SINGLE PHASE WITH EARTHING MICROWAVE 1450W POWER GRILL 850W CONSUMPTION CONVECTION 2250W COMBINATION 2950W MICROWAVE ENERGY OUTPUT 900W (IEC 705) MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 542X329X514.1mm(21.3X13.0X20.2 in.) CAVITY DIMENSIONS (W X H X D) 350X230X355mm(13.8X9.1X14.0 in.)

  • Page 5: External View

    3. EXTERNAL VIEW 1. OUTER DIMENSION 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

    5. CONTROL PANEL 1 Display : Cooking time, power level, indicators and present time are displayed. MW : When blinking, the oven is operating in MICROWAVE COOK. Grill : When blinking, the oven is operating in GRILL. Combi : When blinking, the oven is operating in COMBI. Defrost Weight : When blinking, the oven is operating in WEIGHT DEFROST.

  • 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 (http://svc.dwe.co.kr). 3. To remove door parts. REF NO.
  • Page 12 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 13 KNOB VOLUME ABS SG-175 SG-0760D 3515501820 WINDOW DISPLAY PMMA 3511614700 DECORATOR C-PANEL STS430 T0.5 H/L 3516006200 SPECIAL DOUBLE TAPE KOC-9N7T7S 3516732700 CONTROL-PANEL ABS SG-0760D, SG-175 3516913610 BUTTON FUNCTION-A ABS SG-175 SG-0760D SPRAY 7122401211 SCREW TAPPING T2S TRS 4*12 MFZN PKMPMSA200...
  • Page 14 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 15 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 16 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. 1 2 3 4 REF NO.
  • 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) 11. To remove Rear heater assembly parts. REF NO.

  • Page 18: 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 19: 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 20 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 filter board board Open power Check continuity of Replace continuity power supply cord supply cord Defective touch...
  • Page 21 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 22 (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 23 (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 24: 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 25: 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 26: 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 27: 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 28: Wiring Diagram

    10. WIRING DIAGRAM...

  • Page 29: 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 30 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 CORD PART NAME DESCRIPTION Q'TY 3511725510 DOOR AS KOC-9N7T7S PKCPSWB900 CONTROL-PANEL AS KOC-9N7T7S 3516003700 SPECIAL SCREW TT3 HEX 4X8 FLG MFZN 3512521000...
  • Page 31 PART CORD PART NAME DESCRIPTION Q'TY 3963514330 MOTOR SHADED POLE 230V 50HZ MW10CA-T03 3518902900 THERMOSTAT OFF:140 ON:125 V #187 7121300611 SCREW TAPPING T2S PAN 3X6 MFZN 3513303400 INSULATOR HEATER *B SBHG-1 T0.5 3511409800 COVER HEATER *B SA1D-80 T0.5 3511800700 FAN CONVECTION SA1D-80 T0.5 3512801800 HEATER...

  • Page 32: 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 33 MEASUREPOINT...
  • Page 34 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 35 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 36 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 37: Circuit Diagram

    13. P.C.B. CIRCUIT DIAGRAM...
  • Page 38 PCB ASS’Y PART LIST PART CODE NAME SPECIFICATION Q'TY 3515600100 BUZZER BM-20K (BUJEON) 30166M7020 WAFER MOLEX 35313-0210 4CW215SBD0 CONN WAFER HLEM15S-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 150SC9N4T0 IC MICOM...
  • Page 39 PART CODE NAME SPECIFICATION Q'TY DZN4148--- DIODE 1N4148 AUTO 52MM DZN4148--- DIODE 1N4148 AUTO 52MM DZN4148--- DIODE 1N4148 AUTO 52MM DZN4148--- DIODE 1N4148 AUTO 52MM DZN4148--- DIODE 1N4148 AUTO 52MM DZN4148--- DIODE 1N4148 AUTO 52MM DZN4004A-- DIODE KN4004A AUTO 52MM DZN4004A-- DIODE KN4004A AUTO 52MM...
  • Page 40 PART CODE NAME SPECIFICATION Q'TY RD-AZ332J- R CARBON FILM 1/6 3.3K OHM J RD-AZ103J- R CARBON FILM 1/6 10K OHM J RD-AZ103J- R CARBON FILM 1/6 10K OHM J RN-4Z1203F R METAL FILM 1/4 120K OHM F RD-AZ103J- R CARBON FILM 1/6 10K OHM J RD-AZ105J- R CARBON FILM...
  • Page 41 DAE WOO E LE C TR ONIC S C OR P . 686, AHY E ON-DONG , MAP O-G U, S E OUL, K OR E A. C .P .O. B OX 8003 S E OUL K OR E A P R INTE D DATE : JAN 2005...

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