Daewoo KOR-1A4H Service Manual
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Daewoo KOR-1A4H Service Manual

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S/M No. : R1A0A0C002
Service Manual

Microwave Oven

:
KOR-1A4H
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).
MARCH. 2006

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  • Page 1: Microwave Oven

    S/M No. : R1A0A0C002 Service Manual Microwave Oven KOR-1A4H 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 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

    SAFETY AND PRECAUTIONS CAUTION : This Device is to be Serviced Only by Properly Qualified Service Personnel. 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-1A0A/1A6A KOR-1A4H POWER SUPPLY 127V~60Hz, SINGLE PHASE WITH EARTHING MICROWAVE 1400 W POWER GRILL CONSUMPTION COMBINATION MICROWAVE ENERGY OUTPUT 1000W MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 539X300X406mm 539X300X435mm CAVITY DIMENSIONS (W X H X D)

  • Page 5: Diagrama De Caracteristicas

    DIAGRAMA DE CARACTERISTICAS 1. Ganchos del seguro de la puerta - Este 6. Plato de cristal - Fabricado con cristal horno funciona solamente cuando la puerta especial, resistente al calor. El plato está cerrada totalmente. Si se abre la siempre debe colocarse en su eje antes del puerta, el horno deja de funcionar y de funcionamiento.
  • Page 6 DIAGRAMA DE CARACTERISTICAS (CONTINUACION) 9. Botones numéricos- Se usan para 15. Potencia - Botón para establecer el nivel de seleccionar el tiempo de cocción de los potencia de cocinado. alimentos y la hora actual. 16. Descongelado - Función para descongelar 10.

  • Page 7: Installation

    INSTALLATION 1. Steady, flat location. This oven should be set on a steady, flat surface. This oven is designed for counter top use only. 2. Leave space behind and side All air vents should be kept a clearance. If all vents are covered during operation, the oven may overheat and, eventually, oven failure.

  • Page 8: Operations And Functions

    OPERATIONS AND FUNCTIONS 1. Connect the main lead to an electrical outlet. 2. 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. 3.

  • Page 9: 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.
  • Page 10 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 11 KOR-1A4H REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK 3511711300 DOOR PAINTING AS KOR-1A1G0A 3513100730 HOOK POM BLACK 3515101900 SPRING HOOK HSW-3 3517005910 BARRIER-SCREEN * O GLASS T3.2 3512204320 FRAME DOOR ABS XR-401 SG-175 3511604700 DECORATOR DOOR * T STS304 T0.6...
  • 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 KOR-1A4H REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK 3511604800 DECORATOR C-PANEL STS304 T0.6 3518570930 SWITCH MEMBRANE KOR-1A4H0S 3516722320 CONTROL-PANEL ABS SG-175 SG-0760D PKCPSWXR00 PCB AS KOR-1A0A0C 7122401211 SCREW TAPPING T2S TRS 4* 12 MFZN (1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly.
  • 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 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 16: 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. 2) KOR-1A4H (1) Primary interlock switch When the door is closed, the hook locks the oven door.

  • Page 17: 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 tranformer, disconnect one load wire from these parts and check continuity with the AC plug removed.
  • Page 18 CONDITION CHECK RESULT CAUSE REMEDY Replace Defective Outlet has Check continuity of magnetron Continuity magnetron proper voltage Fuse does not Replace blow. Open power Check continuity of Continuity power supply cord supply cord Replace Normal Defective touch control circuit Replace Display do not shown Malfunction of countdown...
  • 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 oscillation with wires removed transformer Continuity in Replace Check continuity of high voltage Defective high backward rectifier in forward and backward...
  • Page 20 (TROUBLE 4) The following visual conditions inditions indicate a probable defective touch control circuit or membrane switch assembly 1. 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. 2.

  • Page 21: 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 ±...

  • Page 22: 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 23: 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 24: Wiring Diagram

    WIRING DIAGRAM...

  • Page 25: 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: 127V / Frequency: 60Hz Terminal Voltage LOAD NO LOAD AC 12.6 V AC 14.7 V NOTE 1.
  • Page 26 3. When there is no microwave oscillation 1) When touching START pad, oven lamp does not turn on. Fan motor do not rotate, but cook indicator in display comes on. Cause : RELAY 2 does not operate. refer to Circuit Diagram (point 3) - Check method POINT STATE...
  • Page 27 2. P.C.B. CIRCUIT DIAGRAM...

  • Page 28: Location No

    3. P.C.B. LOCATION NO. NAME SYMBOL SPECIFICATION PART CODE Q’TY BUZZER BM-20K 3515600100 C ARRAY 7P(6) 102 M 50V CN6XB-102M CAPACITOR ELEC 50V RS 1•ÏF CEXE1H109A CPAPCITOR ELEC 25V RSS 1000•ÏF CEXF1E102V CONNECTOR WAFER YW396-02V 3519150520 CONNECTOR WAFER YW396-05AV 3519150510 CONNECTOR WAFER FCZ254-11 441M367160...

  • Page 29: 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 30 KOR-1A4H REF NO PART CODE PART NAME DESCRIPTION Q'TY 3511711220 DOOR AS KOR-1A4H 3511711230 DOOR AS KOR-1A0A 3511711240 DOOR AS KOR-1A6A PKCPSWXR00 CONTROL-PANEL AS KOR-1A4H PKCPSWXS10 CONTROL-PANEL AS KOR-1A0A PKCPSWAP90 CONTROL-PANEL AS KOR-1A6A 3510805500 CABINET AS KOR-1A1G0A LOUVER 7112401011 SCREW TAPPING...
  • Page 31 3518571000 SWITCH PUSH MP101C 3513702610 LEVER LOCK POM (KOR-1A4H) 3513702600 LEVER LOCK POM (KOR-1A0A/1A6A) 3513811710 LOCK POM BLACK (KOR-1A4H) 3513811700 LOCK POM BLACK (KOR-1A0A/1A6A) 3513601500 LAMP BL 125V 25W T25 C5A H187 7121400611 SCREW TAPPING T2S PAN 4X6 MFZN 3966310200...
  • Page 32 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. : R1A0A0C002 PRINTED DATE: Nov. 2003...

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