Daewoo KOG-261M Service Manual
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Daewoo KOG-261M Service Manual

Daewoo KOG-261M Service Manual

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Service Manual
Microwave Oven
KOG-261M, KOG-262M
KOG-281M, KOG-282M
DAEWOO ELECTRONICS CO., LTD.

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  • Page 1 Service Manual Microwave Oven KOG-261M, KOG-262M KOG-281M, KOG-282M 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 door open. (b) Make the following safety checks on all ovens to be serviced before activating the mag- netron 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, (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 KOG-261M / 262M KOG-281M / 282M POWER SUPPLY 120V~60Hz, SINGLE PHASE WITH EARTHING MICROWAVE 920W 1200W POWER CONSUMPTION GRILL 1050W 1050W MICROWAVE ENERGY OUTPUT 600W 800W 2450MHz MICROWAVE FREQUENCY OUTSIDE DIMENSIONS (W x D x H) 465 x 360 x 274 mm...

  • Page 5: Features Diagram

    FEATURES DIAGRAM 1 Door latch–When the door is closed it will 12 Menu–Uesd to select foods. automatically lock shut. If the door is 13 Weight–Uesd to select quantity of foods. opened while the oven is operating. The 14 Speedy–Touh to set the any desired magnetron will automatically shut off.

  • Page 6: Earthing Instructions

    • This appliance is supplied with cable of special thpe, 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.

  • 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 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 THIS HAPPENS...
  • Page 10 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 indica- AUTO tor lights and “0” is displayed. DEFROST And the g indicator starts blink- ing.
  • Page 11 COOKING IN ONE STAGE DO THIS... THIS HAPPENS... The M/W indicator lights and POWER “P- ” is displayed. 1. Touch POWER pad. The display will show what you touched. This example shows power level 3. 2. Touch the number pad for the power NOTE: If steps 1 and 2 are level you want.
  • Page 12 GRILL COOKING This function allows you to brown food quickly. The heating element is located in the top of the oven. There is no pre-heating the oven for grill cooking. Place food inside the oven when setting the con- trols. DO THIS...
  • Page 13 AUTO START Allows you to program cooking to start at a time you select. The food will automatically start cooking at the desired time. DO THIS... THIS HAPPENS... 1. Program the desired power level and cooking time. The AUTO START indicator CLOCK/ lights and “...
  • Page 14 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 CLOCK/ time will appear on the display A.START for 3 seconds. 1.
  • Page 15 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 16 * BEVERAGE * (250ml/cup) • 1 cup (mug): Touch BEVERAGE once. • 2 cups (mugs): Touch BEVERAGE twice within 1.5 seconds. • 3 cups (mugs): Touch BEVERAGEthree times within 1.5 seconds. NOTE: 1. This setting is good for restoring cooled beverage to a better drinking temperature. 2.
  • Page 17 AUTO COOK (MENU & WEIGHT) 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.
  • Page 18 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 FEEDING BOTTLE pad, “2”...

  • Page 19: Interlock Mechinism 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 dan- ger resulting from the leakage of microwave. (1) Primary interlock switch When the door is closed, the hook locks the oven door.
  • Page 20 (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 21: 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. You are asked to observe the following precautions carefully.

  • Page 22: 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 seoppr (F37). 2) Remove the door assembly (F00) from the top plate of cavity. 3) Reverse the above for reassembly.
  • Page 23 (1) Remove the gasket door (A06) from door plate (A04). (2) Remove the barrier screen inner (A05) from door plate (A04). (3) Remove the door frame (A02) from door plate (A04). (4) Remove the top hinge stopper (A03) from door plate (A04). (5) Remove the spring (A08) and the hook (A07).
  • Page 25 6. To remove high voltage capacitor. (1) Remove the screw (F13) which secure the grounding ring terminal of diode (F16) and capacitor holder (F14). (2) Remove the capacitor holder (F14) with capacitor (F15). (3) Reverse the above steps for reassembly. High voltage circuit wiring 7.
  • Page 26 CAUTION: Never install the magnetron without the metallic gasket plate which is packed with each magnetron to prevent microwave. Whenever repair work is carried out on magnetron, check the microwave leakage. 8. To remove fan motor assembly. (1) Remove two screws (F08) which secure the back cover (F10) from the cavity outer. (2) Remove two screws (F09) which secure the fan motor (F11) from the back cover (F10).
  • Page 27 10. To remove insulator Heater assembly. (1) Remove the four HEX NUTS 1. (2) Remove the insulator Heater assembly 2. (3) Reverse the above steps for reassembly. 11. To remove Heater Part. PART NAME PART CODE Q’TY DESCRIPTION REMARK 3513301100 INSULATOR HEATER SPP T0.8 3512802300...

  • Page 28: 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 20) 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 29 (TROUBLE 2) Digital readout display does not show programming, even if the mem- brane keyboard is programmed by touching proper pads. Cause Cause Condition Check Result Malfunction Replace Display does not Check each pad for Normal of touch control show programming continuity of the control box sub-...
  • Page 30 2. Type of encoding and pad names. 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. 7. 3. Key check procedure. To determine if the membrane keyboard is defective or not, check the continuity of each pad (KEY) contacts with a multimeter.
  • Page 31 (TROUBLE3) The oven not operate at all; Display window does not display any figures and any inputs can not be accepted. Cause Cause Condition Check Result Malfunction of Replace 15A fuse Check continuity Continuity Interlock moni- Primary Interlock Monitor blows Interlock Switch switch with door and Secondary...
  • Page 32 Cause Cause 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 33 Cause Cause 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 Defective touch transformer and Replace second when Normal control circuit (TROUBLE 5) No microwave oscillation even though fan motor rotates. Cause Cause Condition...
  • Page 34 (TROUBLE 6) Micrwave Output power is low . First of all, check if output power is really low following “measurement of the microwave output power” on page 34. Cause Cause Condition Check Result Customer Descrease in Output Check the power Lower than education power is low.

  • Page 35: 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 operated at its maximum microwave power setting with a load of 1,000±5cc of potable water.
  • Page 36 Procedure A) Prepare Microwave Energy Survey Meter, 600cc glass breaker, glass thermometer100°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. 8.5 cm (3.5 in). C) Place it at the center of the tray and set it in a cavity. D) Close the door and operate the oven.

  • Page 37: Wiring Diagram

    WIRING DIAGRAM...

  • Page 38: Circuit Description

    CIRCUIT DESCRIPTION Refer to the “WIRING DIAGRAM” on page 36. 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 39 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” is 29 seconds. The relation between indications on the control panel and the output of the microwave oven is as shown in Fig.
  • Page 40 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. 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 41: Component Test Procedure

    COMPONENT TEST PROCEDURE 1. High voltage is present at the high voltage terminal of the high voltage transformer during any cook- ing 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 20).

  • Page 42: 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 43: Printed Circuit Board

    PRINTED CIRCUIT BOARD 1. CIRCUIT CHECK PROCEDURE 1) Low Voltage Transformer (DMR-604P) Check. The low voltage transformer is located on the P.C.B. Measuring condition: Input voltage: 120V Frequency: 60Hz Voltage LOAD NO LOAD Terminal 6–7 8-10 2.4V 2.5V NOTE 1: Secondary side voltage of the low voltage transformer changes in proportion to fluctua- tion of power source voltage.
  • Page 44 3) Display problems CAUSE MEASUREMENT RESULT REMEDY Poor contact between Check the voltage Fix the PIN 1 & 25 P.C.B. and display of PIN 1 & PIN 25. 2.4 VAC on the P.C.B. filament. Defective Display Refer to “The display Replace P.C.B.
  • Page 45 Fig. 6 Measurement Point...
  • Page 46 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. CHECK METHOD POINT STAGE RELAY “1”...
  • Page 47 5) When the digital clock does not operate properly. POINT WAVEFORM If clock does not keep exact time, you must check resistor R11, R17. 7) When there is not grill heat. When touching “START” pad, oven lamp turns on. Fan Motor and turntable rotate and cook indicator in display comes on. * Cause: RELAY “4”...

  • Page 48: Component Information

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

  • Page 49: Printed Circuits Board

    3. PRINTED CIRCUITS BOARD...

  • Page 50: Circuit Diagram

    4. P.C.B. CIRCUIT DIAGRAM...

  • Page 51: Location No

    5. P.C.B. LOCATION No. REF No. PART CODE PART NAME DESCRIPTION REMARK R10, 13, 18, 26 RD-AZ472J- RESISTOR 4.7 Kohm, 1/6W, 5% RD-AZ201J- RESISTOR 200 ohm, 1/6W, 5% R5, 8 RD-AZ203J- RESISTOR 20 Kohm, 1/6W, 5% RD-AZ105J- RESISTOR 1 Mohm, 1//6W, 5% R2, 4, 6, 9, 15, 20 RD-AZ102J- RESISTOR 1 Kohm, 1/6W, 5%...

  • Page 52: Exploded And Parts List

    EXPLODED AND PARTS LIST 1. Door Assembly KOG-26XX REF No. PART CODE PART NAME DESCRIPTION Q’TY REMARK 3511707300 KOG-3615OS ONLY KOG-261M DOOR ASSEMBLY 3511707310 KOG-3625OS ONLY KOG-262M 3517003000 ONLY KOG-261M BARRIER-SCREEN * O PMMA 3517003020 ONLY KOG-262M 3512202000 ONLY KOG-261M...
  • Page 53 2. Control Panel Assembly KOG-26XX REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK CONTROL PANEL AS ONLY KOG-261M 3518514000 KOG-261MOS ONLY KOG-261M SWITCH MEMBRANE 3518514800 KOG-262MOS ONLY KOG-261M 3516710900 KOG-361QOS ABS ONLY KOG-261M CONTROL PANEL 3516710710 KOG-262QOS ABS ONLY KOG-262M...
  • Page 55 REF No. PART CODE PART NAME DESCRIPTION Q’TY REMARK 3510801300 ONLY KOG-26XX CABINET PCM T0.6 3510801400 ONLY KOG-26XX 7S312X4081 SCREW TAPPING T1 TRS 4X8 SE MFZN 3516105010 KOG-381QOS ONLY KOG-26XX CAVITY WELD AS 3516104910 KOG-361QPS ONLY KOG-26XX 7S342X40B1 SCREW SPECIAL T2S TRS 4X12 SE MFZN 7X342X40B1 SCREW SPECIAL...
  • Page 56 REF No. PART CODE PART NAME DESCRIPTION Q’TY REMARK 3513805700 LOCK POM BLACK 3513601500 LAMP BL 125V 25W T25 C7A H1 7121400811 SCREW TAPPING T2S PAN 4X8 MFZN 3966820200 MOTOR SYNCRO 120V 2W GM-16-12F17 3515201500 STOPPER HINGE *T AS KOR-61150OS 3517400600 COUPLER 3511403500...
  • Page 57 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) 364-5588/5305 TEL: 02) 360-7114/7315~7 S/M NO.; G261AMU010 PRINTED DATE: APR.1996...

This manual is also suitable for:

Kog-262mKog-281mKog-282m

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