Daewoo KOG-366T0S Service Manual
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Daewoo KOG-366T0S Service Manual

Daewoo KOG-366T0S Service Manual

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Service Manual
Microwave Oven
Model : KOG-366T0S
DAEWOO ELECTRONICS CO., LTD.
OVERSEAS SERVICE DEPT.

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Summary of Contents for Daewoo KOG-366T0S

  • Page 1 Service Manual Microwave Oven Model : KOG-366T0S DAEWOO ELECTRONICS CO., LTD. OVERSEAS SERVICE DEPT.

  • 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 opened. (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, and (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 ITEM SPECIFICATION POWER SUPPLY 230V~50Hz, SINGLE PHASE WITH EARTHING MICROWAVE 1200 W POWER GRILL 1050 W CONSUMPTION COMBINATION 2200 W MICROWAVE ENERGY OUTPUT 800 W(IEC 705) MICROWAVE FREQUENCY 2450 MHz OUTSIDE DIMENSIONS (W X H X D) 465 X 274 X 379 mm CAVITY DIMENSIONS (W X H X D) 290X 200 X 290 mm NET WEIGHT...

  • Page 5: Features Diagram

    FEATURES DIAGRAM 1 Door latch - When the door is closed it will automatically lock shut. If the door is opened while the oven is operating, magnetron will immediately stop operating. 2 Door seal - Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage..

  • Page 6: 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. Examine the oven after unpacking for any damage such as: QA misaligned door, broken door, A 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 Tips : • Be sure to read the cookbook’s introduction before operating the oven. • Also remember to read this operating instruction for proper safety information and instruction before using the oven. • See the cookbook for specific recipes. •...

  • Page 9: Time Defrost

    4. Press CLOCK button. The display will show present time, and the colon strats blinking. This digital clock allows you to set to “10:10”. TIME DEFROST SETTING THE CONTROL 1. Press DEFROST button twice. This TIME DEFROST indicator light will light up. 2.

  • Page 10: Weight Defrost

    WEIGHT DEFROST NOTE : • This digital weight allows you set from 200g to 3000g. • Whenever you press this button, the display is circulated WEIGHT DEFROST, TIME DEFROST, and MICROWAVE mode. SETTING THE CONTROL 1. Press DEFROST button once. The WEIGHT DEFROST indicator light will come on.
  • Page 11 MICROWAVE NOTE : • To insure the best microwave and defrost results, be sure to start with a cool oven. • Let the oven cool 15~20minutes with the door slightly open. • Power levels are 800W, 650W, 450W, 300W and 140W. •...

  • Page 12: Grill Cook

    GRILL COOK NOTE : • The heating element is located in the top of the oven. • There is no pre-heating the oven for grilling. Place food inside the oven when setting the controls. • The GRILL button is used with COMBI function. •...

  • Page 13: Combi Cook

    COMBI COOK NOTE : • Microwave and Grill operate simultaneously (or sequentially) in this mode. • Whenever you press COMBI button, display is changed “0”, “: H”, “: L”, • Therefore you can select power level of MICROWAVE. SETTING THE CONTROL 1.

  • Page 14: Auto Cook

    AUTO COOK NOTE : • There is programmed for cooking of five kinds(1~5). • You don’t have to worry about setting time, power and function. SETTING THE CONTROL You can operate MORE or LESS than programmed time as pressing MORE or LESS button whenever MORE or LESS button, display is changed “10”...
  • Page 15 6. If you want to select other, turn the dial knob until display you desired. The oven will now start auto cook for 7. Press button.This example menu2. don’t set MORE or LESS function. The indicator light starts blinking. 8. Buzzer will sound at the end of the cooking time. the indicator light will go off. The display panel will return to the time of day.

  • Page 16: Speedy Cook

    SPEEDY COOK SETTING THE CONTROL Whenever the button is pressed, 1. Press button. cooking time is increased 30 seconds. Then start lamp will start blinking. If the time was setting, this oven is operated automatically after 2 seconds to microwave high power. NOTE : This key is increased form 30 seconds to 5 minutes.
  • Page 17 TO STOP THE OVEN WHILEITIS OPERATING 1. Press (STOP/CLEAR) button. -Touch once more to erase all instruction except clock. - You can restart the oven by touching (START) button. 2. Open the door -You can restart the oven by closing the door and touching button.

  • Page 18: Interlock Mechanism Functions And Adjustments

    INTERLOCK MECHANISM FUNCTIONS AND ADJUSTMENTS The door lock mechanism 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 19 (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 switch to bring it under “off’, condition and presses the button of the secondary interlock switch to bring it under “on”, condition.

  • Page 20: 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±5cc of potable water.
  • Page 21 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 diameter 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 22: Wiring Diagram

    WIRING DIAGRAM (GERMANY) Fig. 1...
  • Page 23 WIRING DIAGRAM Fig. 1-1...

  • Page 24: Circuit Description

    CIRCUIT DESCRIPTION Refer to the “WIRING DIAGRAM” on page 21, 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 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 26 OUTPUT POWER POWER LEVEL RELAY “1” TURN ON, OFF TIME AGAINST FULL POWER 5/29 11/29 17/29 2329 29/29 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 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 28: Disassembly And Assembly

    DISASSEMBLY AND ASSEMBLY 1. To remove cabinet. Remove three screws (F09) on cabinet back. 2. To remove door assembly. 1) Remove two screws 1 1 which secure the stopper hinge top. 2) Remove the stopper hinge top 2 2 and door assembly 3 from top plate of cavity.
  • Page 29 (1) Remove the gasket door(A07) from door painting ass’y (A05) (2) Remove the door frame(A01) from door painting ass’y (A05) (3) Remove the barrier screen outer(A02) and the supporter barrier screen outer(A03). (4) Remove the hook spring (A09) and the hook (A08). (5) Remove the hinge stopper top ass’y(A04).
  • 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) Pull out the knob volume (B07) form the control panel ass’y (3) Remove eight screws (B05) which secure the PCB ass’y (B10).
  • Page 31 6. To remove high voltage capacitor. (1) Remove a screws 1 1 which secure the grounding ring terminal of the H.V. diode 2 2 and the capacitor holder 3 (2) Remove the H.V. diode 2 2 from the capacitor holder 3 (3) Remove the above steps for reassembly.
  • Page 32 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. It shall not exceed 4mW/cm for a fully assembled oven with door normally closed. 8.
  • Page 33 10. To remove insulator Heater assembly. (1) Remove the four HEX Nuts 1 (2) Remove the Iinsulator Heater assembly 2 (3) Reverse the above steps for reassembly. 11. To remove Heater Part. PART NAME PART CODE Q’TY DESCRIPTION REMARK 3513301100 SPP T0.8 INSULATOR HEATER 3512801700...

  • Page 34: Trouble Shooting Guide

    TROUBLE SHOOTING GUIDE Following the procedures below to check if the oven is defective or not. 1. Check earthing before fault finding. 2. Be careful of the high voltage circuit. 3. Discharge the high voltage capacitor. 4. When checking the continuity of switches, fuse or high voltage transformer, disconnect one lead wire from these parts and check continuity with the AC plug removed.
  • Page 35 (TROUBLE2) Oven does not operate at all; any inputs can not be acceted. Cause Remedy Condition Check Result Malfunction of Replace Check continuity Fuse blows (COM Interlock of interlock monitor NOTE 1 monitor switch Continuity switch with door closed. (COM (COM continuity Malfunction of...
  • Page 36 Cause Remedy Condition Check Result Defective Replace Check continuity Outlet has magnetion and both magnetron Continuity proper Voltage heater and heater Fuse does not thermostat thermostat open Defective line Replace Check continuity filter borard of noise filter Continuity board Open power Replace Check continuity supply cord...
  • Page 37 (TROUBLE4) No microwave oscillation even though fan motor rotates. Cause Remedy Condition Check Result No microwave Check continuity oscillation of high voltage continuity fuse Check continuity Continuity Defective high Replace of high voltage voltage capacitor transformer terminals with wires removed Check continuity Continuity Defective high...
  • Page 38 Cause Remedy Condition Check Result Display does Check each Normal Malfunction of Replace control not show button for touch control box main program ming continuity the tach circuity of assembly at all, even if switch deyboard control box button key is as the following main-assembly pressed...

  • Page 39: Keyboard Check Procedure

    KEYBOARD CHECK PROCEDURE 1. Type of encoding and key names. Fig. 4. KEY MATRIX The tact switch keyboard consists of 9 keys whose aconfigurations are described above. 2. Key check procedure To determine if the tact switch keyboard is defective or not, check the continuity of each button contacts with a multimeter.

  • 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 Wiring Board

    PRINTED CIRCUIT BOARD 1. CIRCUIT CHECK PROCEDURE 1) Low voltage transformer (DMR-814FS) check. The low voltage transformer is located on the P.C.B. Measuring condition: Input voltage : 230V Frequency: 50Hz Voltage LOAD NO LOAD Terminal -19VDC -24VDC 2.1VDC 2.2VAC 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 Poor contact between Check the voltage Fix the PIN 1 & 25 P.C.B. and display of PIN 1 & PIN 25. 2.6 VAC on the P.C.B. filament. The Display has some Refer to “The display Replace P.C.B.
  • Page 44 CHECK METHOD POINT STAGE RELAY “2” ON -5VDC RELAY “2” OFF -24VDC (2) When touching “START” button, oven lamp turn on. Fan motor and turntable rotate and cook indicator in display comes on. * Cause: RELAY “1” does not operate. CHECK METHOD POINT STAGE...
  • Page 45 6) When the door is opened during operation, the count down timer does not stop. CHECK METHOD POINT STAGE 1) DOOR OPENED OPEN -5VDC 2) DOOR CLOSED CLOSED METHOD REMEDY Check the state (ON,OFF) of the secondary Replace secondary interlock switch by resistance measurement. interlock switch 7) When the digital clock does not operate properly.

  • Page 46: Circuit Diagram

    2. P.C.B Circuit Diagram...

  • Page 47: Component Information

    3. COMPONENT INFORMATION 1) Transistor (NPN Type) 2) Diode and Zener Diode D1-16 ZD1-6...

  • Page 48: Printed Circuits Board

    4. PRINTED CIRCUITS BOARD...

  • Page 50: Location No

    PRINTED LOCATION NO. PART NAME SYMBOL SPECIFICATION PARTCODE Q’TY PCB MAIN M156 M156 3514313851 R CARBON FILM R6, R9, R10, R12, R17 1/4W 1KΩJ RD-4Z102J- R CARBON FILM 1/4W 100ΩJ RD-4Z101J- R CARBON FILM 1/4 10KΩJ RD-4Z103J- R CARBON FILM R8, R21 1/4W 4.7KΩJ RD-4Z472J-...
  • Page 51 PART NAME SYMBOL SPECIFICATION PARTCODE Q’TY CONNECTOR YW396-02V 3519150520 CONNECTOR HLEM15S-1 4CW215SBD0 CONNECTOR YW396-05AV 3519150510 WIRE FLAT 1.25X15X90XC WSJ-159007 IC MICOM TMP47C862AN-GC17 13GSR816T- RESONATOR KBR-40MKSTF 5PKBR40MKS BUZZER BM-20K 3515600100 SW RELAY G5J-1-TP-M 24V 5SC0101107 SW RELAY G5B- 24V 5SC0101109 TRANS POWER LVT1 DMR-814FS 5EPV035301...

  • Page 52: Exploded And Parts List

    EXPLODED AND PARTS LIST 1. Door Assembly DOOR AS : 3511707920 PART NAME PART CODE DESCRIPTION Q’TY REMARKS FRAME DOOR 3512202020 BARRIER-SCREEN*O 3517003040 ACRYLE 1.5T SUPPORTER BARRI-S*O 3515304600 STOPPER HINGE*T 3515201500 KOR-61150S DOOR PAINTING AS 3511706100 KOR-61150S BARRIER-SCREEN*I 3517002800 PE 0.1T GASKET DOOR 3512300200 HOOK...

  • Page 53: Control Panel Assembly

    2. Control Panel Assembly C-PANEL AS : PKCPSWSZ00 PART NAME PART CODE DESCRIPTION Q’TY REMARKS DECORATOR C-PANEL 3511602300 C-PANEL 3516710730 BUTTON START 3516905800 MILKY BUTTON FUNCTION(COOK) 3516905700 SCREW TAPPING 7621301011 T2S PAN 3X10 PW MFZN WINDOW DISPLAY 3515500810 PMMA SMOG KNOB VOLUME 3513403810 BUTTON FUNCTION...
  • Page 54 3. Main Unit...
  • Page 55 TAPPING 7112401011 3516003700 TAPPING 7112401011 TAPPING 7112401011 3516002700 TAPPING 7112401011 TAPTITE 7272400811 3516003700 TAPPING 7112401011 TAPTITE 7272400811 TAPPING 7122401211...
  • Page 56 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: JUNE 1998...

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