Daewoo KOR-180A2A Service Manual
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Daewoo KOR-180A2A Service Manual

Daewoo KOR-180A2A Service Manual

Microwave oven
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S/M No. : R180A2A001
Service Manual

Microwave Oven

Model: KOR-180A2A
KOR-181G2A
KOR-181H2A
DAEWOO ELECTRONICS CO., LTD.
MCD1812W

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Summary of Contents for Daewoo KOR-180A2A

  • Page 1: Microwave Oven

    S/M No. : R180A2A001 Service Manual Microwave Oven Model: KOR-180A2A KOR-181G2A MCD1812W KOR-181H2A DAEWOO ELECTRONICS CO., LTD.

  • 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-180A2A/181G2A/181H2A POWER SUPPLY 120V~60HZ, SINGLE PHASE WITH EARTHING MICROWAVE 1600 W POWER GRILL CONSUMPTION COMBINATION MICROWAVE ENERGY OUTPUT 1200 W MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 589X339X487mm (23.2X13.3X19.2 in.) CAVITY DIMENSIONS (W X H X D) 399X278X451mm (15.7X10.9X17.8 in.)

  • 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 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) KOR-180A2A KOR-180A 1. Time set pad - 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.
  • Page 8 (2) KOR-181G2A M/W DEF TIMER LOCK lb MICROWAVE OVEN KOR-181G POPCORN 1. BREAD MORE 2. SOUP 3. BAKED POTATO FROZEN 4. FRESH VEGETABLE PIZZA 5. FROZEN VEGETABLE LESS DINNER AUTO PLATE COOK AUTO DEFROST MEAT POULTRY FISH 1 2 3 POWER 4 5 6 7 8 9...
  • Page 9 (3) KOR-181H2A M/W DEF TIMER LOCK lb MICROWAVE OVEN KOR-181H BEVERAGE POPCORN MORE FRESH FROZEN VEGETABLE PIZZA LESS FROZEN DINNER VEGETABLE PLATE AUTO DEFROST MEAT POULTRY FISH 1 2 3 POWER 4 5 6 7 8 9 DEFROST KITCHEN CLOCK TIMER STOP/ START/...

  • Page 10: 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 11: 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 12: 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 13 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 14 3. To remove door parts. REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK 3512205100 FRAME DOOR ABS SG-175, SG-0760D 3517007400 BARRIER-SCREEN*O SAN T1.5 3515204400 STOPPER HINGE *T AS KOR-162JOA 3511715500 DOOR AS KOR-180A 3517005200 BARRIER-SCREEN*I PE T0.1 3512301800 GASKET DOOR 3513101400 HOOK 3515101900...
  • 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 3518522810 SWITCH MEMBRANE KOR-181G2A 3518522820 SWITCH MEMBRANE KOR-181H2A 3516726000 CONTROL PANEL ABS AF-348, VT-0826 3514325010 PCB AS KOR-180A2A 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 3513702800 LEVER DOOR OPEN 441G430171 BUTTON SPRING SWP DIA 0.7 3516909600 BUTTON DOOR OPEN ABS AF-348, VT-0826 (1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly.
  • Page 17 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 18 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 19: 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 20: 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 21 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 22 (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 23 (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 24: Mesurement And Test

    MEASUREMENT AND TEST 1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT Microwave output power can be checked by indirectly mmeasuring 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 100 ±...

  • Page 25: 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 26: 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 27: Wiring Diagram

    WIRING DIAGRAM...

  • Page 28: 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 AC 12.6 V AC 14.7 V NOTE 1.
  • Page 29 Mesure point...
  • Page 30 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 31: Pcb Circuit Diagram

    2. PCB CIRCUIT DIAGRAM...

  • Page 32: 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 CEXE1H109V CPAPCITOR ELEC 25V RSS 1000µF CEXF1E102V CONNECTOR WAFER YW396-02AV 3519150520 CONNECTOR WAFER YW396-05AV 3519150510 CONNECTOR WAFER FCZ254-11 441M367160...

  • Page 33: 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 34 REF NO PART CODE PART NAME DESCRIPTION Q'TY 3511715500 DOOR AS KOR-180A0A (KOR-180A2A) 3511715510 DOOR AS KOR-181H2A (KOR-181G2A / KOR-181H2A) 3516726410 CONTROL-PANEL AS KOR-180A2A 3516726420 CONTROL-PANEL AS KOR-181G2A 3516726430 CONTROL-PANEL AS KOR-181H2A 3510802400 CABINET SECC T0.6 3516004100 SPECIAL SCREW T1 TRS LR4 POLE 4X10 SE MFZN...
  • Page 35 REF NO PART CODE PART NAME DESCRIPTION Q'TY 3513814300 LOCK POM BLACK 3513601500 LAMP BL 125V 25W T25 C5A #187 7121400611 SCREW TAPPING T2S PAN 4X6 MFZN 3966830700 MOTOR SYNCRO 120V 3W SM012 3518905300 THERMOSTAT OFF:75 ON:65 H #187 NB 3513003400 HOLDER THERMOSTAT PP (NATURAL)
  • Page 36 VISION CREATIVE, INC.
  • 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.:R180A2A001 PRINTED DATE: Aug, 2001...

This manual is also suitable for:

Kor-181g2aKor-181h2a

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