Daewoo KOR-1A0A0C Service Manual
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Daewoo KOR-1A0A0C Service Manual

Daewoo KOR-1A0A0C Service Manual

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S/M No. : R1A0A0C001
Service Manual

Microwave Oven

Model: KOR-1A0A0C
KOR-1A4H0C
DAEWOO ELECTRONICS CO., LTD.
http : //svc.dwe.co.kr
May. 2002

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Summary of Contents for Daewoo KOR-1A0A0C

  • Page 1: Microwave Oven

    S/M No. : R1A0A0C001 Service Manual Microwave Oven Model: KOR-1A0A0C KOR-1A4H0C DAEWOO ELECTRONICS CO., LTD. http : //svc.dwe.co.kr May. 2002...

  • 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 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) 354X228X373mm NET WEIGHT APPROX.

  • Page 5: External View

    EXTERNAL VIEW 1. OUTER DIMENSION KOR-1A0A KOR-1A4H...

  • 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 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 - KOR-1A0A Def. Timer Lock KOR-1A0A 1. Bread 2. Soup AUTO 3. Baked Potato COOK 4. Fresh Vegetable 5. Frozen Vegetable One Touch Dish Warmer Frozen Pizza Beverage Pasta Auto Defrost Fish Poultry Meat Kitchen Power Defrost Clock Timer Stop/Clear...
  • Page 8 - KOR-1A4H Def. Timer Lock MICROWAVE OVEN KOR - 1A4H Dish Pasta Warmer Fresh Beverage Vegetable Frozen Frozen Vegetable Pizza Auto Defrost Fish Poultry Meat 1hour 10min. 1min. Power Defrost Kitchen Clock Timer START/ STOP/ SPEEDY COOK CLEAR 1. Time set pad - Used to set the cooking time and the present time. 2.

  • Page 9: 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 10: 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 11: 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 12 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 13 3. To remove door parts. KOR-1A0A REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK 3517005900 BARRIER-SCREEN*O PETP T0.25 3512204330 FRAME DOOR ABS XR-401, H-2938 KOR-1A0A 3515202900 STOPPER HINGE *T AS KOR-121M 3511711300 DOOR PAINTING AS KOR-1A1G 3517005800 BARRIER-SCREEN*I PETP T0.1 3512301900 GASKET DOOR 3513100700...
  • Page 14 KOR-1A4H REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK 3511711300 DOOR PAINTING AS KOR-1A1G0A 3513100730 HOOK POM BLACK 3515101320 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 3511604710 DECORATOR DOOR * U...
  • Page 15 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 16 DESCRIPTION Q’TY REMARK 3518570920 SWITCH MEMBRANE KOR-1A0A0S 3516724510 CONTROL PANEL ABS XR-401, H-2938 PKMPMSXN10 PCB AS KOR-1A0A0C 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 3513702800 LEVER DOOR OPEN 441G430171 BUTTON SPRING SWP DIA 0.7 3516907940 BUTTON DOOR OPEN ABS SG-0760D SG-175 (1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly.
  • Page 17 KOR-1A4H0S 3516722320 CONTROL-PANEL ABS SG-175 SG-0760D PKMPMSXN10 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. (2) Remove four screws which secure the PCB assembly to control panel.
  • Page 18 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 19 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 20: 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) KOR-1A0A 2) KOR-1A4H (1) Primary interlock switch...

  • Page 21: 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 22 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 23 (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 24 (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 25: 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 26: 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 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: Wiring Diagram

    WIRING DIAGRAM...

  • Page 29: 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 30 Measurement point...
  • Page 31 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 32: Pcb Circuit Diagram

    2. P.C.B. CIRCUIT DIAGRAM...

  • Page 33: 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 1µF CEXE1H109A CPAPCITOR ELEC 25V RSS 1000µF CEXF1E102V CONNECTOR WAFER YW396-02V 3519150520 CONNECTOR WAFER YW396-05AV 3519150510 CONNECTOR WAFER FCZ254-11 441M367160...

  • Page 34: 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 35 REF NO PART CODE PART NAME DESCRIPTION Q'TY 3511711220 DOOR AS KOR-1A4H 3511711230 DOOR AS KOR-1A0A PKCPSWXR20 CONTROL-PANEL AS KOR-1A4H PKCPSWXS10 CONTROL-PANEL AS KOR-1A0A 3510802500 CABINET PCM T0.6 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 3516110400 CAVITY AS KOR-1A1G0A 3516110000 CAVITY JOINT AS KOR-1A1G0A 7122401211...
  • Page 36 REF NO PART CODE PART NAME DESCRIPTION Q'TY 3513702610 LEVER LOCK POM (KOR-1A4H) 3513702600 LEVER LOCK POM (KOR-1A0A) 3513811710 LOCK POM BLACK (KOR-1A4H) 3513811700 LOCK POM BLACK (KOR-1A0A) 3513601500 LAMP BL 125V 25W T25 C5A H187 7121400611 SCREW TAPPING T2S PAN 4X6 MFZN 3966310200 MOTOR SYNCRO 120V 2W GM-16-12F17...
  • Page 37 DAEWOO ELECTRONICS CO., LTD. 686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX: DWELEC K28177-8 CABLE: “DAEWOOELEC” S/M NO. : R1A0A0C001 PRINTED DATE: May, 2002...

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