Daewoo KOR-612L0S Service Manual
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Daewoo KOR-612L0S Service Manual

Daewoo KOR-612L0S Service Manual

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Service Manual
Microwave Oven
Model : KOR-612L0S
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).
DAEWOO ELECTRONICS CO., LTD.
OVERSEAS SERVICE DEPT.

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Summary of Contents for Daewoo KOR-612L0S

  • Page 1 Service Manual Microwave Oven Model : KOR-612L0S 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 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 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: Proper Use And Service 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. PROPER USE SERVICE PRECAUTIONS 1.

  • Page 4: Specifications

    SPECIFICATIONS POWER SUPPLY 230V ~50Hz, SINGLE PHASE WITH EARTHING POWER CONSUMPTION 1200W MICROWAVE OUTPUT POWER 800W(IEC 705) FREQUENCY 2450MHZ OUTSIDE DIMENSIONS(WXHXD) 465X274X354mm CAVITY DIMENSIONS(WXHXD) 290X200X290mm NET WEIGHT APPROX. 13.5KG TIMER 59min. 99sec. POWER SELECTIONS 5 LEVELS * Specifications subject to change without notice.

  • Page 5: Features Diagram

    FEATURES DIAGRAM 1 Door latch - When the door is closed it 0 Time set pad - Used to set the cooking will automatically lock shut. If the door is time and the present time. q Display - Cooking time, power level, pre- opened while the oven is operating.

  • Page 6: Earthing Instructions

    ƒU 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. Examine the oven after unpacking for any damage such as: QA misaligned door, broken door, or dent in cavity.

  • Page 7: Operation Procedure

    OPERATION PROCEDURE This section includes useful information about oven operation. 1. Plug power supply cord into a 230V 50Hz power 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.

  • Page 8: Controls

    CONTROLS SETTING THE CLOCK When the oven is first plugged in, the display will flash “ : 0” and a tone will sound. If the AC power ever goes off, the display will flash “ : 0” when the power comes back on. DO THIS THIS HAPPENS...

  • Page 9: Weight Defrosting

    WEIGHT DEFROSTING WEIGHT DEFROST lets you easily defrost food by eliminating guesswork in determining defrosting time. The min- imum weight for WEIGHT DEFROST is 200 grams. The maximum weight for WEIGHT DEFROST is 3000 grams. Follow the steps below for easy defrosting. DO THIS THIS HAPPENS...

  • Page 10: Time Defrosting

    TIME DEFROSTING When TIME DEFROST is selected, the automatic cycle divides the defrosting time into periods of alternating defrost and stand times by cycling on and off. DO THIS THIS HAPPENS... The WEIGHT DEFROST indicator AUTO lights and “0” is displayed. And the DEFROST g indicator starts blinking.

  • Page 11: Cooking In One Stage

    COOKING IN ONE STAGE DO THIS... THIS HAPPENS... The STAGE1 indicator lights and HIGH “P-HI” is displayed. The display will show what you 1. Touch the power level pad for touched. This example shows the power level you want power level High. among HIGH M-HIGH...

  • Page 12: Cooking In Two Stages

    COOKING IN TWO STAGES For best results, some recipes call for one Power Level for a certain length of time and another power level for a different length of time. Your microwave oven can be set to change from one to another. DO THIS...

  • Page 13: Weight Defrosting And Cooking In Two Stages

    WEIGHT DEFROSTING AND COOKING IN TWO STAGES Some recipes require frozen foods to be thawed before cooking. This oven can be programmed to automatically defrost foods before cooking. DO THIS... THIS HAPPENS... The WEIGHT DEFROST indicator AUTO lights and “0” is displayed. And the DEFROST g indicator starts blinking.
  • Page 14 DO THIS... THIS HAPPENS... The STAGE2 indicator lights and M-HIGH “P-80” is displayed. The display will show want you 5. Touch the power level pad for touched. the power level you want among HIGH M-HIGH M-LOW in the second stage. The display will show the numbers you pressed in the order you touched.

  • Page 15: Auto Start

    AUTO START Allows you to program cooking to start at a time you select. The food will automatically start cooking at the desired time. Program is able up to 2 stages (no acceptable DEFROST) DO THIS... THIS HAPPENS... 1. Program the desired power level and cooking time. The AUTO START indicator lights CLOCK/ and “...

  • Page 16: To Check Auto Start Time

    TO CHECK AUTO START TIME Once you have correctly programmed the oven for AUTO START, the present time will appear on the display. DO THIS... THIS HAPPENS... The programmed AUTO START time will appear on the display for 3 sec- CLOCK/ onds.

  • Page 17: One Touch Cooking

    ONE TOUCH COOKING One touch cook allows you to cook or reheat many of your favorite foods by touching just one pad. To increase quantity, touch chosen pad until number in display is same as desired quantity to cook. (except for DINNER PLATE) DO THIS...
  • Page 18 DO THIS... THIS HAPPENS... When you touch BEVERAGE pad, BEVERAGE “1” is displayed. After 1.5 seconds, the display 1. Touch BEVERAGE pad. changed into cooking time of quan- tity and the oven starts cooking. ƒNBEVERAGE ƒN(250ml/cup) ¡ 1 cups (mugs): Touch BEVERAGE once. ¡...

  • Page 19: Feeding Bottle

    FEEDING BOTTLE This key is for feeding bottle disinfection effect. At first, detach the nipple from the bottle and pour the 30cc water into each bottle, arrange the bottle symmetrically on the glass tray and operate. DO THIS... THIS HAPPENS... When you touch FEEDING BOT- FEEDING TLE pad, “2”...

  • Page 20: Interlock Mechanism Functions And Adjustments

    INTERLOCK MECHANISM FUNCTIONS AND ADJUSTMENTS The door lock mechamism is a device 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.
  • Page 21 (2) Secondary interlock switch and interlock monitor switch When the door is closed, the hook pushes the push lever down ward, and push lever presses the button of the interlock monitor swich to bring it under “off”, condition and presses the button of the secondary interlock switch to bring it under “on”, condition.

  • Page 22: Measurement Of The Microwave Output Power

    MEASUREMENT OF THE MICROWAVE OUTPUT POWER 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. Proedure 1. Microwave power output measurement is made with the microwave oven supplied at rated Voltage and operat- ed at its maximum microwave power setting with a load of 1,000¡...

  • Page 23: Wiring Diagram

    Procedure A) Prepare Microwave Energy Survey Meter, 600cc glass beaker, glass thermometer 100˚C or 212˚F. B) Pour 275cc¡ 15cc of tap water initially at 20¡ 5˚C(68¡ 9˚F) in the 600cc beaker with an inside diam- eter of approx. 8.5cm (3.5in). C) Place it at the center of the tray and set it in a cavity.

  • Page 24: Circuit Description

    CIRCUIT DESCRIPTION Refer to the “KOR-612L0S WIRING DIAGRAM” (Fig. 1) on page 22. MICROWAVE COOKING TIME COOKING 1. When the food is placed inside the oven and door is closed. 1) The low voltage transformer supplies the necessary voltage to the touch control circuit when the power cord is plugged in.
  • Page 25 Fig. 2 The touch control circuit controls the ON-OFF time of RELAY “1” in order to vary the output power of the microwave oven from “power level low” to “HI (100%) power”. One complete ON and OFF cycle of the RELAY “1” is 29 seconds. The relation between indications on the control panel and the output of the microwave oven is as shown in Fig.
  • Page 26 OUTPUT POWER POWER LEVEL RELAY “1” TURN ON, OFF TIME AGAINST FULL POWER 5/29 (17%) M-Low 11/29 (38%) 17/29 (59%) M-High 23/29 (79%) High 29/29 (100%) Fig. 3 AUTO DEFROST CYCLE When auto defrost is selected and the desired defrosting time is chosen, the automatic cycle divides the defrosting time into 5 periods of alternating defrost and stand times, by cycling on and off.

  • Page 27: Safety Precautions For Disassembly And Repair

    SAFETY PRECAUTIONS FOR DISASSEMBLY AND REPAIR – Cautions to be observed when trouble shooting. Unlike many other appliances, the microwave oven is a high-voltage, high-current equipment. It is com pletely safety during normal operation. However, carelessness in servicing the oven can result in an electeric shock or possible danger from a short circuit.

  • Page 28: Disassembly And Assembly

    DISASSEMBLY AND ASSEMBLY 1. To remove cabinet. Remove three screws (F02) on cabinet back. 2. To remove door assembly. 1) Remove two screws (F40) which secure the top hinge stopper(F37). 2) Remove the door assembly (A00) from the top plate of cavity. 3) Reverse the above for reassembly.
  • Page 29 (1) Remove the gasket door (A06) from door painting AS (A04). (2) Remove the barrier screen inner (A05) from door painting AS (A04). (3) Remove the door frame (A02) from door painting AS (A04). (4) Remove the top hinge stopper (A03) from door painting AS (A04). (5) Remove the spring (A08) and the hook (A07).
  • Page 30 5. To remove control panel parts. (1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly. NOTE: Do not attempt to remove switch membrane except for replacement. (2) Remove the door open lever (B05) from the control panel (B02). (3) Remove three screws (B04) which secure the P.C.B.
  • Page 31 6. To remove high voltage capacitor. (1) Remove a screw (F13) which secure the grounding ring terminal of the H.V. diode (F16) and the capacitor holder (F14). (2) Remove the capacitor holder (F14) with H.V. capacitor (F15). (3) Reverse the above steps for reassembly. High voltage circuit wiring 7.
  • Page 32 CAUTION: Never install the magnetron without the metallic gasket plate which is packed with each mag- netron to prevent microwave. Whenever repair work is carried out on magnetron, check the microwave leakage. It shall not exceed 4mW/cm for a fully assembled oven with door normally closed. 8.

  • Page 33: Trouble Shooting Guide

    TROUBLE SHOOTING GUIDE Following the procedures below to check if the oven is defective or not. 1. Check grounding before checking trouble. 2. Be careful of the high voltage circuit. 3. Discharge the high voltage capacitor. (see page 26) 4. When checking the continuity of switches or of the high voltage transformer, disconnect one lead wire from these parts and then check cintinuity with the AC plug removed.
  • Page 34 (TROUBLE 2) Digital readout display does not show programming, even if the membrane keyboard is programmed by touching proper pads. Condition Check Result Cause Remedy Display does Check each Malfunction of Replace control Normal not show pro- pad for con- touch control box sub- gramming at...
  • Page 35 2. Type of encoding and pad names. HIGH M-HI M-LOW BAKED FROZEN SPEEDY BEVERAGE VEGETABLE PIZZA COOK POTATO FEEDING LESS MORE START BOTTLE STOP/ CLOCK/ AUTO CLEAR A.START DEFROST Fig. 5 Key Matrix The membrane keyboard consists of 27 keys whose configurations are described above and provide 11 pad ter- minations to be connected to the touch control circuit as Fig.
  • Page 36 (TROUBLE3) The oven not operate at all; Display window does not display any figures and any inputs can not be accepted. Cause Remedy Condition Check Result Malfunction of Replace Primary 12A fuse Check continuity Continuity Interlock moni- Interlock Switch blows Interlock Monitor and Secondary switch with door...
  • Page 37 Cause Remedy Condition Check Result Outlet has Check continuity Defective oven Replace proper of oven thermostat. Continuity voltage thermostat Fuse does not open Check continuity Open power Replace of power supply supply cord. Continuity cord. Defective touch Replace Normal control circuit Malfunction of Display do not secondary...
  • Page 38 Cause Remedy Condition Check Result Turn table Check continuity Open winding Replace motor, of primary wind- Conntinuity fan motor and oven lamp turn of high voltage on for a transformer and second when touch control Defective touch the start pad Normal Replace circuit...
  • Page 39 Cause Remedy Condition Check Result Customer Descrease in Output Check the power Lower than education power source power is low. source voltage 207 volts with magnetron voltage Normal Defective touch Check the timing Abnormal Replace control circuit periods of the NOTE 3 RELAY “1”...

  • Page 40: Component Test Procedure

    COMPONENT TEST PROCEDURE 1. High voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle. 2. It is neither necessary nor advisable to attempt measurement of the high voltage. 3. Before touching any oven components or wiring, always unplug the oven from its power source and discharge the capacitor (see page 26).

  • Page 41: Safety Interlock Continuity Test

    SAFETY INTERLOCK CONTINUITY TEST ¡ Disconnect the oven from the power supply. ¡ You can test continuity of safety interlocks and monitor switch by using switch tester or ohmmeter. ¡ The switch operation is checked by the lamp on/off of resistance zero/unlimited. ¡...

  • Page 42: Printed Circuit Board

    PRINTED CIRCUIT BOARD 1. CIRCUIT CHECK PROCEDURE 1) Low Voltage Transformer (DMR-604FS) Check. The low voltage transformer is located on the P.C.B. Measuring condition: Input voltage: 230V Frequency: 50Hz Voltage LOAD NO LOAD Terminal 6–7 NOTE 1: Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source voltage.
  • Page 43 3) Display problems CAUSE MEASUREMENT RESULT REMEDY Defective Display Refer to “The display Replace P.C.B. trouble shooting data” assembly. below. The display trouble shooting data DISPLAY NAME MICOM OUTPUT TROUBLE & PIN NO. IN PIN NO. STAGE1, LOCK don’t come on. GRID1 (G1), 10 STAGE2, NO don’t come on.
  • Page 44 Fig. 6 Measurement Point...
  • Page 45 CHECK METHOD POINT STAGE RELAY “2” ON –24VDC RELAY “2” OFF (2) When touching “START” pad, oven lamp turn on. Fan motor and turntable rotate and cook indicator in display comes on. ƒNCause: RELAY “1” does not operate. CHECK METHOD POINT STAGE RELAY “1”...
  • Page 46 5) When the digital clock does not operate properly. POINT WAVEFORM T:20ms If clock does not keep exact time, you must check resistor R21, R34.

  • Page 47: Circuit Diagram

    2. P.C.B. CIRCUIT DIAGRAM(L-type)

  • Page 48: Component Information

    3. COMPONENT INFORMATION 1) Transistor 2) Diode and Zener Diode...

  • Page 49: Printed Circuits Board

    4. PRINTED CIRCUITS BOARD...

  • Page 50: Location No

     Caution: In this Service 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) 5. P.C.B. LOCATION No. REF NO.

  • Page 51: Exploded And Parts List

    EXPLODED AND PARTS LIST 1. Door Assembly DOOR ASSEMBLY : 3511706020 REF. NO PART CODE PART NAME DESCRIPTION Q’TY REMARKS 3517003020 BARRIER-SCREEN *O PMMA T1.5 3512202010 FRAME DOOR 3515201500 STOPPER HINGE *T SCP-1 T2.5 3511706100 DOOR PAINTING AS KOR-6115OS 3517002800 BARRIER-SCREEN *I POLYESTER T0.1 3512300200...
  • Page 52 PPL(Parts Price List) in Service information Center(http://svc.dwe.co.kr) 2. Control Panel Assembly CONTROL PANEL ASSEMBLY : PKCPSWCR00 REF. NO PART CODE PART NAME DESCRIPTION Q’TY REMARKS 3518513500 SWITCH MEMBRANE KOR-612L0S 3516710710 CONTROL-PANEL PKMPMSCN00 PCB MAIN AS KOR-611L0S 7621401211 SCREW TAPPING T2S PAN 4X12 PW MFZN 3513701400...
  • Page 53 EXPLODED VIEW...

  • Page 54: Parts List

    PARTS LIST  Caution: In this Service 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 55 DAEWOO ELECTRONICS CO., LTD. 686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX: DWELEC K28177-8 CABLE: “DAEWOOELEC” FAX: 02) 590-6291 TEL: 02) 360-7114/590-6151~5 http://www.dwe. daewoo.co.kr S/M NO. : PRINTED DATE: OCT.1998...

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