Daewoo KOR-145M0P Service Manual
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Daewoo KOR-145M0P Service Manual

Daewoo KOR-145M0P Service Manual

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Service Manual

Microwave Oven

Model: KOR-145M0P
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.
KOR-145Q0P

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Summary of Contents for Daewoo KOR-145M0P

  • Page 1: Microwave Oven

    : 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.

  • 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: Proper Use And Service Precautions

    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. 1.

  • Page 4: Specifications

    SPECIFICATIONS POWER SUPPLY 220V~60Hz, SINGLE PHASE WITH EARTHING POWER CONSUMPTION 1350 W MICROWAVE OUTPUT POWER 900 W (IEC 705) FREQUENCY 2450 MHZ OUTSIDE DIMENSIONS (W X H X D) 560 X 360 X 396 mm (22 X 14.2 X 15.6 in.) CAVITY DIMENSIONS (W X H X D) 382 X 270 X 360 mm (15.0 X 10.6 X 14.2 in.) NET WEIGHT...

  • Page 5: Feature Diagram

    FEATURES DIAGRAM (KOR-145M) STAGE DEFROST AUTO WEIGHT TIME START LOCK CUPS AUTO COOK 1. BAKED POTATO MENU STAGE DEFROST AUTO 2. FRESH VEGETABLE WEIGHT TIME START 3. SOUP WEIGHT 4. FISH FILLETS LOCK CUPS AUTO COOK 5. MEAT LOAF 1. BAKED POTATO MENU 2.
  • Page 6 FEATURES DIAGRAM (KOR-145Q) STAGE DEFROST AUTO WEIGHT TIME START LOCK CUPS POPCORN SOUP STAGE DEFROST AUTO SPEEDY WEIGHT TIME START COOK LOCK CUPS MUFFIN BEVERAGE POPCORN SOUP SPEEDY COOK MUFFIN BEVERAGE BAKED FROZEN BAKED FROZEN POTATO PIZZA DINNER FRESH POTATO PLATE VEGETABLE PIZZA...

  • Page 7: Earthing Instructions

    • 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. 6. Examine the oven after unpacking for any damage such as: A misaligned door, Broken door, A dent in cavity.

  • Page 8: 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 9: 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...

  • Page 10: Weight Defrosting

    WEIGHT DEFROSTING WEIGHT DEFROST lets you easily defrost food by eliminating guesswork in determining defrosting time. The minimum 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...

  • Page 11: 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... AUTO STAGE DEFROST AUTO DEFROST START WEIGHT TIME 1. Touch AUTO DEFROST pad. LOCK CUPS AUTO...

  • Page 12: Cooking In One Stage

    COOKING IN ONE STAGE DO THIS... THIS HAPPENS... The STAGE1 indicator lights and “P-” POWER is displayed. AUTO STAGE DEFROST START WEIGHT TIME 1. Touch POWER pad. LOCK CUPS The display will show what you STAGE DEFROST AUTO touched. This example shows power START WEIGHT TIME...

  • Page 13: 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 14: 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 STAGE DEFROST AUTO AUTO START lights and “0”...
  • Page 15 DO THIS... THIS HAPPENS... The STAGE2 indicator lights and “P-” POWER is displayed. AUTO STAGE DEFROST START WEIGHT TIME 6. Touch POWER pad. LOCK CUPS The display will show what you STAGE DEFROST AUTO touched. START WEIGHT TIME 7. Touch the number pads for the power level you want in the second stage.

  • Page 16: 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 (not acceptable DEFROST) DO THIS... THIS HAPPENS... 1. Program the desired power level and cooking time. The AUTO START indicator lights and CLOCK/ AUTO...

  • Page 17: 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 seconds. CLOCK/ A.START 1.

  • Page 18: 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 MUFFIN & DINNER PLATE) KOR-145Q0S KOR-145M0S POPCORN...

  • Page 19: Frozen Pizza

    DO THIS... THIS HAPPENS... When you touch FROZEN PIZZA, FROZEN “200” is displayed. AUTO STAGE DEFROST PIZZA START WEIGHT TIME After 1.5 seconds, the display changed into cooking time of quantity and the oven starts cooking. 1. Touch FROZEN PIZZA pad. LOCK CUPS * FROZEN PIZZA*...
  • Page 20 DO THIS... THIS HAPPENS... When you touch DINNER PLATE pad, DINNER “300” is displayed. STAGE DEFROST AUTO PLATE START WEIGHT TIME After the 1.5 seconds, the display changed into cooking time of quantity and the oven starts cooking. 1. Touch DINNER PLATE pad. LOCK CUPS NOTE : For best results, consult the cookbook.
  • Page 21 DO THIS... THIS HAPPENS... When you touch FRESH VEGETABLE FRESH pad, “200” is displayed. AUTO STAGE DEFROST VEGETABLE START WEIGHT TIME After 1.5 seconds, the display changed into cooking time of quantity and the oven starts cooking. 1. Touch FRESH VEGETABLE pad.
  • Page 22 AUTO COOK (MENU & WEIGHT) ; KOR-145M0S Only Auto cook allows you to cook or reheat many of your favorite foods by repeatedly touching menu pad. After the menu selection, touch chosen pad until number in display is same as desired quantity to cook. DO THIS...

  • Page 23: Child Safety Lock

    *BAKED POTATO * (160~180g/ea.) • 1 NO (ea.) : Touch WEIGHT once. • 2 NO (ea.) : Touch WEIGHT twice within 1.5 seconds. • 3 NO (ea.) : Touch WEIGHT three times within 1.5 seconds. *FRESH VEGETABLE* • 200 g : Touch WEIGHT once. •...

  • Page 24: Interlock Mechanism Functions And Adjustment

    INTERLOCK MECHANISM FUNCTIONS AND ADJUSTMENT The door lock mechanism is a device 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 25 (2) Secondary interlock switch, interlock monitor switch When the door is closed, the hook pushes the push lever downward, the push lever presses the button of the secondary interlock switch and door open monitor switch to bring it under “NO” condition the hook presses the button of interlock monitor switch to bring it under “NO”...

  • Page 26: 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. 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 1,000 ±...

  • Page 27: Wiring Diagram

    - Measuring should be in a counter-clockwise direction at a rate of 1 inch/sec. If the leakage of the cabinet door seam is unknown, move the probe more slowly. - When measuring near a corner of the door, keep the probe perpendicular to the areas making sure the probe end at the base of the cone does not get closer than 2 inches from any metal.

  • Page 28: Circuit Description

    CIRCUIT DESCRIPTION Refer to the “WIRING DIAGRAM” 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 29 H.V. CAPACITOR H.V. DIODE MAGNETRON WIRING COLOR R: RED H.V. TRANSFORMER 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 1” to “HI (100%) power”. One complete ON and OFF cycle of the RELAY “1”...
  • Page 30 OUTPUT POWER POWER LEVEL RELAY “1” TURN ON, OFF TIME AGAINST FULL POWER 0/29 (0 %) 3/29 (10 %) 5/29 (17 %) 8/29 (28 %) 11/29 (38 %) 14/29 (48 %) 17/29 (59 %) 20/29 (69 %) 23/29 (79 %) 26/29 (90 %) 29/29 (100%) Fig.

  • Page 31: 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 completely safety during normal operation. However, carelessness in servicing the oven can result in an electric shock or possible danger from a short circuit.

  • Page 32: Disassembly And Assembly

    DISASSEMBLY AND ASSEMBLY 1. To remove cabinet. Remove four screws from the rear section and push the cabinet backward. 2. To remove door assembly. (1) Remove three bolts 1 and nuts 2 which secure top hinge and under hinge stopper, respectively. (2) Remove the top hinge stopper 4 and under hinge stopper 5.
  • Page 33 (1) Remove the out plate 5 and door frame 6 . (2) Remove the microwave absorber 2 and film 1 . (3) Remove a Spring 7 and Hook 3 . (4) Reverse the above steps for reassembly. NOTE : Do not attempt to remove Barrier screen “4” except for replacement. 4.
  • Page 34 5. To remove control panel assembly. (1) Disconnect two connector and terminals on the printed circuit board assembly and remove a screw 0 holding the grounding ring terminal 9 of Main harness, which secured front plate. (2) Remove two screws holding control panel assembly to the oven front.
  • Page 35 6. To remove high voltage capacitor. (1) Remove two screws 1 which secure the grounding ring terminal 2 of diode and capacitor holder 3 . (2) Remove capacitor holder 3 with capacitor 4 . (3) Reverse the above steps for reassembly. High voltage circuit wiring 7.
  • Page 36 CAUTION : Never install the magnetron without the metallic gasket plate which is packed with each magnetron to prevent microwave leakage. Whenever repair work is carried out on magnetron, check the microwave leakage. It shall not exceed 1mW/cm 8. To remove fan motor assembly and guide wind. (1) Remove screws 1 .
  • Page 37 10.Replacement of the tray motor. (1) Cut the TRAY MOTOR COVER from the BASE PLATE. (2) Disconnect two terminal wires from the tray motor. (3) Remove two screws 2 holding the tray motor. (4) To install a new tray motor reverse the above steps.

  • Page 38: 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. 4. When checking the continuity of switches or of the high voltage transformer, disconnect one lead wire from these parts and then check continuitry with the AC plug removed.
  • Page 39 (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 Normal Display does not Check each pad for Malfunction of Replace show programming at all, continuity of the touch control control box...
  • Page 40 KOR-145Q STAGE DEFROST AUTO WEIGHT TIME START LOCK CUPS POPCORN SOUP SPEEDY COOK MUFFIN BEVERAGE BAKED FROZEN POTATO PIZZA DINNER FRESH PLATE VEGETABLE AUTO DEF. Clock / Power A.Start STOP/ START CLEAR PAD Termination PCB Connection Fig. 7...
  • Page 41 2. Type of encoding and pad names. (KOR-145Q) FRESH BAKED DINNER SOUP POWER VEGETABLE POTATO PLATE FROZEN POPCORN BEVERAGE MUFFIN SPEEDY PIZZA COOK START LESS MORE STOP/ CLOCK/ AUTO CLEAR A.START DEFROST Fig. 8 Key Matrix The membrane keyboard consists of 26 keys whose configurations are described above and provide 11 pad terminations to be connected to the touch control circuit as Fig.
  • Page 42 KOR-145M DINNER BAKED POWER PLATE POTATO FROZEN SPEEDY BEVERAGE MUFFIN PIZZA COOK PIZZ FEEDING START START LESS MORE BOTTLE STOP/ CLOCK/ AUTO STOP/ WEIGHT MENU CLEAR A.START DEFROST CLEAR A.ST Fig. 8 Key Matrix The membrane keyboard consists of 25 keys whose configurations are described above and provide 11 pad terminations to be connected to the touch control circuit as Fig.
  • Page 43 (TROUBLE 3) Oven does not operate at all; Display window does not display any figures and any inputs can not be accepted. Condition Check Result Casue Remedy 15A fuse Check continuity Continuity Malfunction of Replace Primary blows Interlock Monitor Interlock monitor Interlock Switch switch with door switch...
  • Page 44 Condition Check Result Cause Remedy Outlet has Check continuity of Defective mangetron Replace proper voltage. Magnetron thermostat Continuity thermostat. Fuse does not open. Check continuity of Open power supply Replace power supply cord. Continuity cord. Defective touch Normal Replace control circuit. Display do not shown Malfunction of Replace...
  • Page 45 (TROUBLE 5) No microwave oscillation even though fan motor rotates. Condition Check Result Cause Remedy No microwave Check continuity of Defective magnetron Replace oscillation connecting wire of Continuity magnetron Continuity Check continuity of Defective high voltage Replace filament terminal of Continuity transformer, high voltage...
  • Page 46 (TROUBLE 6) Microwave output power is low. First of all, check if output power is really low following “measurement of the microwave output power” on page 26. Condition Check Result Cause Remedy Output power Check the power Lower than Decrease in Customer education is low.

  • Page 47: 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 1.

  • Page 48: 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 49: Printed Circuits 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 ; 220V Measuring condition : Frequency ; 60Hz Voltage LOAD NO LOAD Terminal 8 - 10 2.4V 2.5V...
  • Page 50 3) Display Problems CAUSE MEASUREMENT RESULT REMEDY Poor contact between Check the voltage Fix the PIN 1 & 25 2.4 VAC P.C.B. and display filament. of PIN 1 & PIN 25. on the P.C.B. Defective Display Refer to “The display Replace P.C.B.
  • Page 51 MP-1 MP-3 MP-2 Fig 3. Measurement Point...
  • Page 52 CHECK METHOD POINT STAGE RELAY “2” ON -24VDC RELAY “2” OFF (2) When touching “START” pad, oven lamp turns on. Fan motor and turntable rotate and cook indicator in display comes on. * Cause : RELAY “1” does not operate. -24V CHECK METHOD POINT...
  • Page 53 6) When the digital clock does not operate properly. POINT WAVEFORM T ; 16.67 ms -14V If clock does not keep exact time, you must check resistor R17, R11.

  • Page 54: Pcb Circuit Diagram

    2. PCB CIRCUIT DIAGRAM...

  • Page 55: Component Information

    3. COMPONENT INFORMATION TRANSISTOR Q 1, 3-5 Emitter Collector Base DIODE AND ZENER DIODE DIODE CATHODE (K) ANODE (A) D1-7, 9-14 ZENER CATHODE (K) ANODE (A) ZD 1-3 DIODE...

  • Page 56: Printed Circuits Board

    4. PRINTED CIRCUITS BOARD...

  • Page 57: 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. NAME SYMBOL SPECIFICATION...

  • Page 58: Exploded And 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) EXPLODED AND PARTS LIST 1.
  • Page 59 PART NAME DESCRIPTION Q’TY REMARKS 3518510500 KOR-145M0A KOR-145M SWITCH MEMBRANE 3518510600 KOR-145Q0A KOR-145Q 3516711700 CONTROL PANEL PKMPMSME00 PCB MAIN AS KOR-145M0P, 145Q0P 3513701700 LEVER DOOR OPEN ACETAL DURACON M90-02 3516904200 BUTTON DOOR OPEN 441G430171 SPRING DOOR BUTTON SWP DIA 0.7...

  • Page 60: Exploded View

    EXPLODED VIEW...
  • Page 61  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) PART CODE PART NAME DESCRIPTION Q’TY...
  • Page 62 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) 360-8184 TEL: 02) 360-8183 http://www.dwe. daewoo.co.kr S/M NO. : R145M0P001 PRINTED DATE: Sep. 1998...

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Kor-145q0p

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