Daewoo KOC-9U0T7S Service Manual
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Daewoo KOC-9U0T7S Service Manual

Daewoo KOC-9U0T7S Service Manual

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S/M No. : OC9U0T7S01
Service Manual

Microwave Oven

Model: KOC-9U0T7S
?
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).
Mar. 2008

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Summary of Contents for Daewoo KOC-9U0T7S

  • Page 1: Microwave Oven

    S/M No. : OC9U0T7S01 Service Manual Microwave Oven Model: KOC-9U0T7S 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-9U0T7S POWER SUPPLY 230V~50Hz, SINGLE PHASE WITH EARTHING MICROWAVE 1500W POWER GRILL 1950W CONSUMPTION CONVECTION 1950W COMBINATION 1950W MICROWAVE ENERGY OUTPUT 900W (IEC 705) MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X D X H) 542X438X329mm(21.5X17.2X13 in.) CAVITY DIMENSIONS (W X D X H) 350X367X240mm(13.8X14.4X9.4 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.

  • 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, program indicators and present time are displayed. MW ( ): When blinking, the oven is operating in MICROWAVE COOK mode. Grill ( ): When blinking, the oven is operating in GRILL mode. Combi ( ): When blinking, the oven is operating in COMBI mode.

  • 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 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. PART CODE PART NAME DESCRIPTION Q’TY REMARK 3511727210 DOOR AS KOC-9U0T7S 3511714700 DOOR SEAL AS KOC-910K0S 3513101200 HOOK 3515102300 SPRING HOOK 3512209240 FRAME DOOR ABS XR-401 SR-0320...
  • 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 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. REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK PKCPSWYR00 CONTROL PANEL AS KOC-9U0T7S 3516736500 CONTROL-PANEL ABS SG-0760D SG-175 3515503000 WINDOW DISPLAY 3516916800 BUTTON FUNCTI0N-A ABS SG-0760D SG-175 3516916900 BUTTON FUNCTI0N-B...
  • 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 10. To remove Rear heater assembly parts. REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK 3511801300 FAN CONVECTION AS KOC-9U0T7S 3511414200 COVER FAN CONVECTION SA1D80 T0.5 3515309600 SUPPORTER FAN MOTOR SBHG T0.6 7113400814 SCREW TAPPING T1 BIN 4X8 MFNI...

  • Page 17: 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 18: 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 19 CONDITION CHECK RESULT CAUSE REMEDY Defective Outlet has Check continuity of Replace continuity magnetron. proper magnetron voltage fuse does not blow? Check continuity of noise filter Defective line Replace continuity board filter board Open power Check continuity of Replace continuity supply cord power supply cord Defective touch...
  • Page 20 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 21 (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 Check continuity of Malfunction of replace...
  • Page 22 (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 23: 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 24: 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 25: 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 26: Component Action

    4. COMPONENT ACTION MAGNE- UPPER LOWER 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 CHILLY PIZZA PIZZA FROZEN PIZZA FRESH PIZZA STEAM CLEANING...

  • 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 F12 F13 F13 F10...
  • Page 29 So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr). PARTS_CODE PARTS_NAME PARTS_DESCR PQTY 3511727210 DOOR AS KOC-9U0T7S PKCPSWYR00 CONTROL PANEL AS KOC-9U0T7S 3511801300 FAN CONVECTION AS KOC-9U0T7S 3512529000 GUIDE WIND AS...

  • 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(load) Voltage(no load) 6-10 AC 12.4 V AC 13.3 V NOTE 1.
  • Page 31 MEASUREPOINT...
  • Page 32 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 12V DC...
  • Page 33 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. STATE POINT A POINT B RELAY 2 ON +5V DC...
  • Page 34 6. Case of no stopping of the count down timer When the door is opened during operation, the count down timer does not stop. 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 35: Circuit Diagram

    13. P.C.B. CIRCUIT DIAGRAM...
  • Page 36 PCB ASS’Y PART LIST LOCATION PART CODE NAME SPECIFICATION Q'TY 3515600100 BUZZER BM-20K CN5XB-102M C ARRAY 6P(5) 1000PF M 50V CEXE1H100A C ELECTRO 50V RS 10uF CEXF1E102V C ELECTRO 25V RSS 1000MF 3519150530 CONNECTOR WAFER YW396-03V 30166M5030 CONNECTOR WAFER MOLEX 35312-0310 4CW215SBD0 CONNECTOR WAFER HLEM15S-1...
  • Page 37 LOCATION PART CODE NAME SPECIFICATION Q'TY GMS8252402 IC MICOM GMS82524(OTP) 1K1A7033AP IC RESET KIA7033AP CN101 4CW215RBD0 CONN WAFER HLEM15R-1 M288 3514331340 PCB SUB 95.3X215 R101,R102 RD-AZ102J- RESISTOR 1/6W 1K 5% EN101 5S10302005 SW ROTARY EC12E24204A8 SW101~SW111 5S50101Z93 SW TACT KPT-1115AM J105 85801052GY WIRE COPPER 7.5mm...
  • Page 38 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. : PRINTED DATE: Mar. 2008...
  • Page 39 ABOUT THIS MANUAL ABOUT THIS MANUAL VISION CREATIVE, INC. "# $%& '() * +, -./0 1 2 -)5 6 789! ! ! ! ! :;<89 =;>?@AB7CDEDF:G?H 1BI LBBMNBONLP PB Q :! ! 8! ! :! ! ; BMNBONLP?vwxZ 1BI BMNBONL1?TIy!LCI!KSzxZLI BMNBONL*?PCIy!PMIy!P@Iy!LBIy!L@Iy!OBIy!OPIy!OLIy!OOIy!O1Iy!OTIKS ELI!{UGzxZ PPI BMNB1NBL?TIy!PLIy!LPIy!LTIy!L@Iy!OBI!KSz!xZ *I...

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