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Daewoo KOC-8H6T7S Service Manual

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S/M No. : OC8H6T7S01
Service Manual

Microwave Oven

Model: KOC-8H6T7S
✔
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).
Nov. 2008

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Summary of Contents for Daewoo KOC-8H6T7S

  • Page 1: Microwave Oven

    S/M No. : OC8H6T7S01 Service Manual Microwave Oven Model: KOC-8H6T7S ✔ 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-8H6T7S POWER SUPPLY 230V~50HZ, SINGLE PHASE WITH EARTHING MICROWAVE 1400W POWER GRILL 850W CONSUMPTION COMBECTION 1850W COMBINATION 2500W MICROWAVE ENERGY OUTPUT 900W(IEC705) MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 501X473X391mm (19.7X18.6X12.6 in.) CAVITY DIMENSIONS (W X H X D) 310X328X232mm (12.2X12.9X9.1 in.)

  • Page 5: External View

    3. EXTERNAL VIEW 1. OUTER DIMENSION...

  • 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

    5. CONTROL PANEL • LED LAMP 1 Auto Cook : Show “Auto Cook” cooking in progress. (5 menus) 2 Instant Cook : Show “Instant Cook” cooking in progress. (5 menus) 3 Steam Cleaning : Show steam cleaning in progress. 4 Convection : Show “Convection” cooking including fermentation function in progress.
  • Page 9 DISPLAY 1 THE NUMBER AND LETTER DISPLAY Clock, cooking time, temperature and locking etc are displayed. 2 THE ACCESSORY DISPLAY The accessory used on cooking light in display. Use the lighting accessory on cooking. : means Glass Turntable Tray. : means Metal Tray. : means Low Metal Rack.

  • Page 10: 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 11 1. To remove cabinet 1) Remove four screws on cabinet back. 2) Push the cabinet backward. 2. To remove guide wind 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 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 (http://svc.dwe.co.kr). 3. To remove door parts. 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’. • Loosen two screws on stopper hinge top, and then push the door to contact the door seal to oven front surface. •...
  • Page 14 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN PKMPMSGM10 PCB MAIN MANUAL AS KOC-8H6T7S 1) Remove the screws 2) Pull out the Main PCB assembly 3) Pull out the Knob Dial AS 4) Remove the Holder LED 5) Remove the button function...
  • 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 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 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). 11.To remove Rear heater assembly parts. REF NO.

  • Page 19: 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. SWITCH MOUNTING SWITCH MOUNTING BRACKET...

  • Page 20: 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 21 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 22 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 23 (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 24 (TROUBLE 6) The following visual conditions 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 25: 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 26: 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 27: 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 28: Component Action

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

  • Page 29: Wiring Diagram

    10. WIRING DIAGRAM...

  • Page 30: 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 31 220/240V 50/60HZ SM16 HK36M6F6 7121400611 SCREW TAPPING T2S PAN 4X6 MFZN 3514801400 SENSOR TEMPERATURE MWS-DWM-0010-0 7S432X4081 SCREW SPECIAL TT3 TRS 4X8 SE MFZN 3512782660 HARNESS MAIN KOC-8H6T7S G/TCO 3513811750 LOCK CHEIL(FH-44N) 3513702620 LEVER LOCK 4415A66910 SW MICRO VP-531A-OF/SZM-V16-FA-61 4415A66910 SW MICRO VP-531A-OF/SZM-V16-FA-61...
  • Page 32 PART CORD PART NAME DESCRIPTION Q'TY 3518003700 MAGNETRON 2M218JFL 6CF 3516004000 SPECIAL SCREW T2 BOLT FLANGE 5X12 DACRO 3512805800 HEATER MIRACLON 230V 800W 270MM 3512806900 HEATER REFLECTOR STS430 T0.5 7122408114 SCREW TAPPING T2S TRS 4X6 MFNI 3511412400 COVER HEATER *T SA1D-80 T0.4 3510610500 BRACKET COVER HEATER...

  • Page 33: Printed Circuit Board

    12. PRINTED CIRCUIT BOARD "#$#% &'()*+,-.) /00()!1(2-() 3.45(6-+.4 1(2-() %+6).725( &)289!:2*0 3.45(6-+.4!;24 ABCD :<&!=>? :<&!@>?

  • Page 34: Pattern Diagram

    13. P.C.B PATTERN DIAGRAM EF< GH" E@=<...

  • Page 35: Circuit Diagram

    14. P.C.B. CIRCUIT DIAGRAM...
  • Page 36 DAEWOO ELECTRONICS CORP. 1-2, Jeo-dong 1(il)-ga, Jung-gu, Seoul, Korea C.P.O. BOX 8003 SEOUL, KOREA TELEX: DWELEC K28177-8 CABLE: “DAEWOOELEC” S/M NO. : PRINTED DATE: Nov. 2008...
  • Page 37 ABOUT THIS MANUAL ABOUT THIS MANUAL < < I I J J I I $ $ H H ! 3 3 K K L L M M & & I I < < L L 9 9 ! ! I I H H 3 3 # # NO PQR STU V WX YZ[\ ] ^ Yab c...

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