Daewoo KOR-6NDB Service Manual
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Daewoo KOR-6NDB Service Manual

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S/M No. : R6NDB3A001
Service Manual

Microwave Oven

:
KOR-6NDB
Model
• 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).
Jan. 2006

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Summary of Contents for Daewoo KOR-6NDB

  • Page 1: Microwave Oven

    S/M No. : R6NDB3A001 Service Manual Microwave Oven KOR-6NDB Model • 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 micro- wave source, and make repairs as 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

    SAFETY AND PRECAUTIONS CAUTION This device is to be Serviced only by Properly Qualified Service Personel. Consult the Service Manual for Proper Service Procedures to Assure Continued Safety Operation and for Precautions to be Taken to Avoid Possible Exposure to Excessive Microwave Energy. 1.

  • Page 4: Specifications

    SPECIFICATIONS MODEL KOR-6NDB3A POWER SUPPLY 120V~60Hz, SINGLE PHASE WITH GROUNDING MICROWAVE 1000W POWER GRILL CONSUMPTION COMBINATION MICROWAVE ENERGY OUTPUT 700W MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 465 x 279 x 323 mm (18.3 x 11.0 x 12.7 in) CAVITY DIMENSIONS (W X H X D) 301 x 219 x 283 mm (11.8 x 8.6 x 11.1 in) NET WEIGHT...

  • Page 5: External View

    EXTERNAL VIEW 1. OUTER DIMENSION...

  • Page 6: Feature Diagram

    2. FEATURE DIAGRAM 1. DOOR SEAL Door seal maintains the microwave within the oven cavity and prevents microwave leakage. 2. DOOR HOOK When the door is closed, it will automatically lock shut. If door is opened while oven is operating, magnetron tube will immediately stop operating.

  • Page 7: Control Panel

    3. CONTROL PANEL 1. Number pads-Used to set the cooking time and the present time. 2. Display-Cooking time, power level indicators and present time are displayed. 3. One touch-Used to cook or reheat specific quantities of food. 4. More-Used to add time to cooking. 5.

  • Page 8: Installation

    INSTALLATION 1. Steady, flat location. This microwave oven should be set on a steady, flat surface. 2. Leave space behind and side. All air vents should be kept a clearance. If all vents are covered during operation, the oven may be overheated and, eventually, cause oven failure.

  • Page 9: Operations And Functions

    OPERATIONS AND FUNCTIONS 11. Connect the main lead to an electrical outlet. 12. After placing the food in a suitable container, open the oven door and put it on the glass tray. The glass tray must always be in place during cooking. 13.

  • Page 10: Disassembly And Assembly

    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. You are asked to observe the following precautions carefully.
  • Page 11 1. To remove cabinet 1) Remove three 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 reassembly.
  • Page 12 3. To remove door parts. REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK 3512203880 FRAME DOOR PP SI83C 3517007300 BARRIER-SCREEN*0 PET T0.125 3515204100 STOPPER HINGE *T AS KOR-63150S 3511705500 DOOR WELD AS KOR-61150S 3517002800 BARRIER-SCREEN *I T0.1 3512300210 GASKET DOOR 3513100700 HOOK 3515101300...
  • 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 a screws on stopper hinge top, and then push the door to contact the door seal to oven front surface. Tighten two screws.
  • Page 14 5. To remove control panel parts. REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK 3518572000 SWITCH MEMBRANE KOR-6NDB3A 3516725310 CONTROL PANEL ABS VE-0826 AF-348 PKMPMSFM00 PCB AS 6N(700W,A,9,59) 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 3513702710 LEVER DOOR OPEN 441G430171 SPRING BUTTON SWP DIA 0.7...
  • 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 which secure the wind guide assembly. 2) Draw forward the wind guide assembly. 3) Pull the fan from the motor shaft. 4) Remove two screws which secure the motor shaded pole. 5) Remove the motor shaded pole.

  • Page 17: Interlock Mechanism And Adjustment

    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

    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 transformer, disconnect one lead wire from these parts and check continuity with the AC plug removed.
  • Page 19 (TROUBLE 3) No microwave oscillation even though fan motor rotates. CONDITION CHECK RESULT CAUSE REMEDY Continuity Replace Check continuity of high Defective high microwave voltage capacitor terminals voltage trans- oscillation with wires removed former Continuity in Replace Check continuity of high voltage Defective high backward rectifier in forward and backward...
  • Page 20 CONDITION CHECK RESULT CAUSE REMEDY Replace Defective mag- Outlet has Check continuity of magnetron Continuity netron proper volt- age Fuse does not Replace blow. Open power sup- Check continuity of Continuity power supply cord ply cord Replace Normal Defective touch control circuit Replace Display do not shown...
  • Page 21 (TROUBLE 4) The following visual conditions indicate a probable defective touch control circuit or membrane switch assembly. 11. Incomplete segments (1) Segments missing (2) Partical segments missing (3) Digit flickering other than normal display slight flickering (4) “ :0” does not display when power is on. 12.

  • Page 22: Measurement And Test

    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. 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±5cc of potable water.

  • Page 23: Microwave Radiation Test

    2. MICROWAVE RADIATION TEST CAUTION : 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 24: 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 25: Wiring Diagram

    WIRING DIAGRAM...

  • Page 26: Printed Circuit Board

    PRINTED CIRCUIT BOARD 1. CIRCUIT CHECK PROCEDURE 1. Low Voltage Transformer check The low voltage transformer is located on the P.C.B. Measuring condition: input voltage : 120V/Frequency : 60Hz Terminal Voltage LOAD NO LOAD 5-6-7 AC 12.6 V AC 14.7 V NOTE : 1.
  • Page 28 3. When there is no microwave oscillation 1) When touching START pad, oven lamp does not turn on. Fan motor does not rotate, but cook indicator in display comes on. (TRAY LAMP) - Check method POINT STATE RELAY 2 ON 5VDC RELAY 2 OFF 12VDC...

  • Page 29: Pcb Circuit Diagram

    2. PCB CIRCUIT DIAGRAM...

  • Page 30: Location No

    3. PCB LOCATION NO. (KOR-6NDB3A) NAME SYMBOL SPECIFICATION PART CODE Q'TY REMARK BUZZER BM-20K (BUJEON) 3515600100 C ARRAY 7P(6) 1000PF M 50V 2.54MM CN6XB-102M CONN WAFER YW396-02V(YEONHO) 3519150520 CONN FILM FCZ 254-11(YEON HO) 441M367160 CONN WAFER YW396-05AV(YEONHO) 3519150510 LED DISPLAY LTC-4651HG(631) DDDG631H02 C ELECTRO...
  • Page 31 (KOR-6NDB3A) NAME SYMBOL SPECIFICATION PART CODE Q'TY REMARK BUZZER BM-20K (BUJEON) 3515600100 C ARRAY 7P(6) 1000PF M 50V 2.54MM CN6XB-102M CONN WAFER YW396-02V(YEONHO) 3519150520 CONN FILM FCZ 254-11(YEON HO) 441M367160 CONN WAFER YW396-05AV(YEONHO) 3519150510 LED DISPLAY LTC-4651HG(631) DDDG631H02 C ELECTRO 25V RSS 1000MF (13X20) TP CEXF1E102V IC MICOM...

  • Page 32: Exploded View And Parts List

    EXPLODED VIEW AND PARTS LIST 1. DOOR ASSEMBLY Refer to Disassembly and assembly. 2. CONTROL PANEL ASSEMBLY Refer to Disassembly and assembly. 3. TOTAL ASSEMBLY...
  • Page 33 REF NO. PART CODE PART NAME DESCRIPTION Q'TY 3511714420 DOOR AS KOR-63D59A PKCPSWF300 CONTROL-PANEL AS KOR-6NDB3A 3510808100 CABINET CR 0.5T 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 3516117400 CAVITY AS KOR-6NM51A 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 7112401011 SCREW TAPPING...
  • Page 34 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. : R6NDB3A001 PRINTED DATE: Jan. 2006...

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