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Daewoo KOG-311M0P Service Manual

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Service Manual
Microwave Oven
Model: KOG-311M0P
KOG-311Q0P
DAEWOO ELECTRONICS CO., LTD.

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Summary of Contents for Daewoo KOG-311M0P

  • Page 1 Service Manual Microwave Oven Model: KOG-311M0P KOG-311Q0P 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 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: Exposure To Excessive Microwave Energy

    CAUTION: This Device is to be Serviced Only by Properly Qualified Service Personnel. Consult the Service Manual for Proper Service Procedures to Assure Continued Compliance with the Federal Performance Standard for Microwave Ovens and for Precautions to be Taken to Avoid Possible Exposure to Excessive Microwave Energy.

  • Page 4: Specifications

    SPECIFICATIONS POWER SUPPLY 220V~60Hz SINGLE PHASE WITH EARTHING MICROWAVE 1500W POWER CONSUMPTION GRILL 1100W COMBI 2600W MICROWAVE ENERGY OUTPUT 950W (IEC 705) MICROWAVE FREQUENCY 2450 MHz OUTSIDE DIMENSIONS (WxHxD) 564 x 310 x 413 mm CAVITY DIMENSIONS (WxHxD) 374 x 233 x 372 mm NET WEIGHT APPROX.

  • Page 5: Features Diagram

    FEATURES DIAGRAM 1. Door latch–When the door is closed it will 7. Glass cooking tray-Made of special heat automatically lock shut. If the door is opened resistant glass. The tray must always be in while the oven is operating, the magnetron will proper position before operating.
  • Page 6 FEATIRES DIAGRAM (CONTINUED) M-Type 13. Time set pad–Used to set the cooking time 19. Auto defrost-Used to defrost foods. and the present time. 20. Power-Used to set power level. 14. Display-Cooking time, power level, indicators and present time are displayed. 21.
  • Page 7 FEATIRES DIAGRAM (CONTINUED) Q-Type 13. Time set pad–Used to set the cooking time 19. Auto defrost-Used to defrost foods. and the present time. 20. Power-Used to set power level. 14. Display-Cooking time, power level, indicators and present time are displayed. 21.

  • Page 8: 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. Examine the oven after unpacking for any damage such as: A misaligned door, Broken door, A dent in cavity.

  • Page 9: Operation Procedure

    OPERATION PROCEDURE This section includes useful information about oven operation. 1. Plug power supply cord into a standard 3-pronged 15 Amp, 220V AC 60Hz 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 and roller guide must always be in place during cooking.

  • Page 10: 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 shows ":0" when the power comes back on. 1. Touch CLOCK/A.START pad. CLOCK/ NOTE: This oven has multiple clock...
  • Page 11 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. The WEIGHT DEFROST indicator lights and 1. Touch AUTO DEFROST pad. AUTO "0" is displayed. And the g indicator starts DEFROST blinking.
  • 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 girll cooking. Place food inside the oven when setting the controls. 1. Touch GRILL pad. The GRILL indicator lights and ":0"...
  • Page 13 AUTO START Auto start can be programmed for up to two cooking stages. Auto start can not be programmed for auto defrost. 1. Program the desired power level and cooking time for food to be cooked. CLOCK/ 2. Touch CLOCK/A.START pad. The AUTO START indicator lights and ":0"...
  • Page 14 ONE TOUCH COOKING One touch cook all allows you to cook or reheat many of your favorite foods by touching just one pad. To increase quantity, touch chosen pad until unmber in display is same as desired quantity to cook. When you touch FROZEN PIZZA pad 1.
  • Page 15 AUTO COOK (MENU & WEIGHT) (M-TYPE) Auto cook allows you to cook or reheat many of your favorite foods by repeatedly touching menu pad. After the menu selections, touch chosen pad until number in display is same as desired quantity to cook. 1.
  • Page 16 ONE TOUCH COOKING (Q-TYPE) 1. Touch SOUP pad once for a When you touch SOUP pad once, "250" is SOUP 250g soup or twice for a 350g. displayed. After 1.5 seconds, the display shows the cooking time and the oven starts cooking.
  • Page 17 MORE, LESS MORE pad: adds 10 seconds to 20 seconds. LESS pad: removes 10 seconds to 20 seconds. This pad only works with one touch cooking. Always input prior to one touch sequence. CHILD SAFETY LOCK The safety lock prevents unwanted oven operation such as by small children. To set, press and hold STOP/CLEAR for 3 seconds, LOCK indicator lights.

  • 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. (1) Primary interlock switch When the door is closed, the hook locks the oven door.
  • 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 D.O.M 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. 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: Wiring Diagram

    E) Measure the leakage by using microwave energy survery meter with dual ranges, set to 2,450 MHz. – Measured radiation leakage must not exceed the values prescribed below. • Leakage for a fully assembled oven with door normally closed must be less than 4mW/cm –...

  • Page 22: Circuit Description

    CIRCUIT DESCRIPTION Refer to the "WIRING DIAGRAM" Fig. 2 on page 19. 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 23 OR FA H.V. CAPACITOR H.V. DIODE MAGNETRON WIRING COLOR OR: ORANGE H.V. TRANSFORMER Fig. 3 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 24 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. 4 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 25: Safety Precautions For Disassembly And Repair

    SAFETY PRECAUTIONS FOR DISASSEMBLY AND REPAIR – Cautions to be observed when troubleshooting. 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 26: Disassembly And Assembly

    DISASSEMBLY AND ASSEMBLY 1. To remove cabinet. Remove three screws (F02). 2. To remove door assembly. 1) Remove two screws (F38) which secure the top hinge stopper (A03). 2) Remove the door assembly (A00) from top plate. 3) Reverse the above for reassembly. 3.
  • Page 27 (1) Remove the gasket door (A06) from door plate. (2) Remove the barrier screen inner (A05) from door plate. (3) Remove the door frame (A02) from door plate. (4) Remove the top hinge stopper (A03) from door plate. (5) Remove the spring (A08) and the hook (A07). (6) Remove the barrier screen outer (A01) from door frame (A02).
  • Page 28 5. To remove control panel assembly. (1) Disconnect all the lead wires connected to control panel assembly. (2) Remove the screw (F20) holding the control panel assembly. NOTE: Do not attempt to remove switch membrane except for replacement. (1) Remove the four screws (B04) from the P.C.B. ass'y (B03). (2) Pull out the P.C.B.
  • Page 29 6. To remove insulator Heater assembly. (1) Remove the two HEX NUTS (F41). (2) Remove the two HEX NUTS (F48) (3) Remove the insulator Heatr assembly (C00). (4) Reverse the above steps for reassembly. PART NAME PART CODE Q’TY DESCRIPTION REMARK INSULATOR HEATER 3513302200...
  • Page 30 7. To remove high voltage capacitor. (1) Remove the screw (F09) which secure the grounding ring terminal of diode (F10) and capacitor holder (F08). (2) Remove the capacitor holder (F08) with capacitor (F11). (3) Reverse the above steps for reassembly. High voltage circuit wiring 8.
  • Page 31 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 4mW/cm2 for assembled oven with door normally closed. 9.

  • Page 32: Trouble Shooting Guide

    TROUBLE SHOOTHING 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 23) 4. When checking the continuity of switches or of the high voltage transformer, disconnect one lead wire from these parts and then check continuity with the AC plug removed.
  • Page 33 (TROUBLE 2) Digital readout display does not show programming, even if the membrane keyboard is programmed by touching proper pads. Condition Result Cause Remedy Check Normal Check each pad for Malfunction Replace Display does not continuity of the of touch control show programming membrane keyboard...
  • Page 34 MEMBRANE KEYBOARD CHECK PROCEDURE 1. Check the pad Q-TYPE Fig. 7...
  • Page 35 2. Type of encoding and pad names. M-TYPE Fig. 8 Key Matrix The membrane keyboard consists of 25 keys whose configurations are described in Fig. 8 and provide 11 pad terminations to be connected to the touch control circuit as Fig. 7 3.
  • Page 36 2. Type of encoding and pad names. Q-TYPE Fig. 8 Key Matrix The membrane keyboard consists of 25 keys whose configurations are described in Fig. 8 and provide 11 pad terminations to be connected to the touch control circuit as Fig. 7 3.
  • Page 37 (TROUBLE 3) The oven does not operate at all; Display window does not display any figures and any inputs can not be accepted. NOTE 1: All these switches must be replaced at the same time, please refer to page 16 and 17 for adjustment instructions.
  • Page 38 Condition Result Cause Remedy Check Check continuity Outlet has Defective oven Replace of open proper Continuity thermostat thermostat Voltage Fuse does not open Check continuity Open power Replace of power supply Continuity supply cord cord. Defective touch Replace Normal control circuit Malfunction of Display do not Replace...
  • Page 39 Condition Result Cause Remedy Check Turn table motor Check continuity Open winding Replace Continuity fan motor and of primary winding oven lamp turn of high voltage on for a transformer and Defective touch Replace Normal second when touch control control circuit the start pad circuit is tapped...
  • Page 40 (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 18. Condition Check Result Cause Remedy Check the power Decrease in Output Lower than Customer source voltage power source...

  • Page 41: Component Test Procedure

    COMPONENT TEST PROCEDURE 1. High voltage is present at the high voltage terminal of the 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 23).
  • Page 42 SAFETY INTERLOCK CONTINUITY TEST • You can test continuity of safety interlock and monitor switch by using ohmmeter. • The switch operation is checked by zero/unlimited. • The meter should indicate zero resistance. • The sequence of check is interlock monitor switch, primary and secondary interlock switches check. 1) In case of interlock monitor switch check.

  • Page 43: 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: 220V 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 fluctuation 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 filament. Defective Display Refer to "The display Replace P.C.B. trouble shooting data" assembly.
  • Page 45 MP-1 MP-3 MP-2 Fig 9. 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. -24V CHECK METHOD POINT STAGE...
  • Page 47 6) When the digital clock does not operate properly. POINT WAVEFORM T : 16.67ms 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.

  • Page 48: Circuit Diagram

    2. PCB CIRCUIT DIAGRAM (M-TYPE)
  • Page 49 2. PCB CIRCUIT DIAGRAM (Q-TYPE)

  • Page 50: Component Information

    3. COMPONENT INFORMATION 1) Transistor Q1, 3-6 Emitter Collector Base 2) Diode and Zener Diode...

  • Page 51: Printed Circuit Board

    4. PRINTED CIRCUIT BOARD...

  • Page 52: Location No

    5. P. C. B. LOCATION NO. PART NAME REF NO. SPECIFICATION PART CODE Q'TY RESISTOR R10,13,18, 26 4.7KΩ, 1/6W, 5% RD-AZ472J- RESISTOR 200Ω, 1/6W, 5% RD-AZ201J- RESISTOR R5,8 20KΩ, 1/6W, 5% RD-AZ203J- RESISTOR 1MΩ, 1/6W, 5% RD-AZ105J- RESISTOR R2,4,9,15,20 1KΩ, 1/6W, 5% RD-AZ102J- RESISTOR R11, 17...

  • Page 53: Exploded And Parts List

    EXPLODED VIEW AND PARTS LIST 1. DOOR ASSEMBLY DOOR ASSEMBLY: 3511708000 REF. NO PART CODE PART NAME DESCRIPTION Q'TY REMARK 3517004300 BARRIER-SCREEN *0 PMMA T1.5 3512203200 FRAME DOOR ABS XR-401 H-2938 3515202900 STOPPER HINGE *T AS KOR-121M0A 3511708100 DOOR PAINTING AS KOR-121M0A 3517004200 BARRIER-SCREEN *I...
  • Page 54 2. CONTROL PANEL ASSEMBLY CONTROL PANEL ASSEMBLY: PKCPSWMS00(M-TYPE) PKCPSWMT00(Q-TYPE) REF. NO PART CODE PART NAME DESCRIPTION 3518519800 M-TYPE SWITCH MEMBRANE 3518519810 Q-TYPE 3516715010 CONTROL-PANEL ABS XR-401 H-2938 PKMPMSMS00 PCB MAIN AS KOG-311Q0P, 311M0P 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 3513702500 LEVER DOOR OPEN 441B655072...
  • Page 56 REF. NO PART CODE PART NAME DESCRIPTION Q'TY REMARK DOOR AS EXPLODED AND PARTS LIST CONTROL-PANEL AS 3513302400 INSULATOR HEATER AS KOG-311M0S 3510801700 CABINET PCM T0.6 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 7121403011 SCREW TAPPING T2S PAN 4X30 MFZN...
  • 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) 360-8184 TEL: 02) 360-8183 http://www.dwe. daewoo.co.kr S/M NO. : G311M0P001 PRINTED DATE: Sep. 1998...

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Kog-311q0p

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