DAEWOO ELECTRONICS KOR-616T0A Service Manual
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DAEWOO ELECTRONICS KOR-616T0A Service Manual

DAEWOO ELECTRONICS KOR-616T0A Service Manual

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Service Manual
Microwave Oven
Model: KOR-616T0A
DAEWOO ELECTRONICS CO., LTD.
KOR-816T0A
KOR-616T1A

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Summary of Contents for DAEWOO ELECTRONICS KOR-616T0A

  • Page 1 Service Manual Microwave Oven Model: KOR-616T0A KOR-816T0A KOR-616T1A 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...

  • 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 AND SERVICE PRECAUTIONS 1.

  • Page 4: Specifications

    SPECIFICATIONS Specifications KOR-816T KOR-616T Power Supply 120V ~ 60Hz, SINGLE PHASE WITH EARTHING POWER CONSUMPTION 1200 W 920 W MICROWAVE OUTPUT POWER 800 W (IEC 705) 600 W (IEC 705) FREQUENCY 2450 MHz OUTSIDE DIMENSIONS (W x H x D) 495 x 289 x 409 mm 465 x 274 x 372 mm CAVITY DIMENSIONS (W x H x D)

  • Page 5: Features Diagram

    FEATURES DIAGRAM Stop Defrost Quantity Weight Time Stop Defrost Quantity Weight Time Lock Auto cook Watt Lock Auto cook Watt Power Defrost +1min Power Defrost +1min Auto Cook 1. Beveroge 2. Soup 3. Casserole 4. Vegetable 5. Fish Fillets START STOP Auto Cook More...

  • Page 6: Installation

    INSTALLATION STEADY, FLAT LOCATION This microwave oven should be set on a steady, flat surface. LEAVE SPACE BEHIND AND SIDE All air vents should be kept a clearance. lf all vents are covered during operation, the oven may overheat and, eventually, cause oven failure. AWAY FROM RADIO AND TV SETS Poor television reception and radio interference may result if the oven is located close to a TV, Radio, or antenna, feeder and so on.

  • Page 7: Operation Procedure

    OPERATION PROCEDURE This section includes useful information about oven operation. 1. Plug power supply cord into a 120V 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 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 bfore using the oven. • See the cookbook for specific recipes. • Prior to setting the controls, place one cup of water in the oven, in a heat-proof glass measuring cup, for testing purposes.
  • Page 9 4. Press CLOCK button. The display will show present time, and the colon starts blinking. This digital clock allows you to set to “10:10” TIME DEFROST SETTING THE CONTROL 1. Press DEFROST button This TIME DEFROST indicator twice. light will light up. Time 2.
  • Page 10 WEIGHT DEFROST NOTE :• This digital weight allows you set from 8 oz to 6 lb 8 oz. • Whenever you press this button, the display is circulated WEIGHT DEFROST, TIME DEFROST, and MICROWAVE mode. SETTING THE CONTROL 1. Press DEFROST button The WEIGHT DEFROST once.
  • Page 11 COOKING IN ONE STAGE 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, 140W(KOR-816T) or 600W, 500W, 350W, 250W and 100W(KOR-616T) •...
  • Page 12 COOKING IN TWO STAGES NOTE : 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. SETTING THE CONTROL 1. Press POWER button more than three times.
  • Page 13 When you touch START, both 5. Press button. STAGE1 & 2 indicator lights come Stage STAGE1 indicator light blinking to show you that the oven is cooking in the first of two cook stages. The oven will cook at the power you selected for stage 1.
  • Page 14 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 7. Press button. for menu2. This example don't set MORE The indicator light starts blinking. or LESS function. For example: KOR-616T Auto cook 8.Buzzer will sound at the end of the cooking time.
  • Page 16 SPEEDY COOK SETTING THE CONTROL Whenever the button is pressed, 1. Press button. cooking time is increased 30 Then start lamp will start seconds. blinking. If the time was setting, this oven is operated automatically after 2 seconds to microwave high power. NOTE : This key is increased from 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 which 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, the 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 MICROWAVE RADIATION TEST WARNING Make sure to check the microwave leakage before and after repair or adjustment. • Always, start measuring of an unknown field to assure. Safety for operating personnel from microwave energy. • Do not place your hands into any suspected microwave radiation field unless the safe density level is known.

  • Page 22: Wiring Diagram

    WIRING DIAGRAM 0A TYPE PRIMARY INTERLOCK HIGH VOLTAGE SWITCH(UPPER) TRANSFORMER FUSE POWER SUPPLY: LIVE SINGLE PHASE ONLY CONTROL P.W.B. ASS’Y H.V. INTERLOCK CAPACITOR MONITOR RELAY-1 SWITCH RELAY-2 MAGNETRON H.V. DIODE NEUTRAL SECONDARY INTERLOCK SWITCH NOTE RD : RED OR : ORANGE CL : CAVITY LAMP (CONDITION) WH : WHITE...

  • Page 23: Circuit Description

    CIRCUIT DESCRIPTION Refer to the “WIRING DIAGRAM” (Fig. 1) on page 21. MICROWAVE COOKING TIME COOKING 1. When the food is placed incide 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 24 3.3V H.V. CAPACITOR H.V. DIODE MAGNETRON 2000V WIRING COLOR H.V. TRANSFORMER OR: ORANGE 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 “5 (100%) power”. One complete ON and OFF cycle of the RELAY “1”...
  • Page 25 OUTPUT POWER POWER LEVEL RELAY “1” TURN ON, OFF TIME AGAINST FULL POWER 5/29 11/29 17/29 23/29 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 26: 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 you are asked to observe the following precautions carefully.

  • Page 27: Disassembly And Assembly

    DISASSEMBLY AND ASSEMBLY 1. To remove cabinet. Remove three screws on cabinet back. 2. To remove door assembly. 1) Remove two screws ¤ which secure the stopper hinge top. 2) Remove the stopper hinge top ¤Ł and door assembly ¤Ø from top plate of cavity. 3) Remove the stopper hinge top ¤Ł...
  • Page 28 (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). (6) Remove two screws(A11) which secure the handle door(A10).
  • Page 29 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 30 6. To remove high voltage capacitor. (1) Remove a screws ¤ which secure the grounding ring terminal of the H.V. diode ¤Ł and the capacitor holder ¤Ø . (2) Remove the H.V. diode ¤Ł from the capacitor holder ¤Ø . (3) Remove the above steps for reassembly.
  • 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/cm for a fully assembled oven with door normally closed. Magnetron Wave guide Magnetron antenna...

  • Page 32: Trouble Shooting Guide

    TROUBLE SHOOTING GUIDE Folling the procedure 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 the switches, fuse or high voltage transformer, disconnect one lead wire from these parts and check continuity with the AC plug removed.
  • Page 33 (TROUBLE 2) Oven does not operte at all; any inputs can not be acceted Condition Result Cause Remedy Check (COM Check continuity Replace Malfunction of Fuse blows of interlock Interlock monitor Continuity NOTE 1 monitor switch switch with door closed. (COM (COM continuity...
  • Page 34 Condition Result Cause Remedy Check Defective Outlet has Check continuity Replace magnetion and proper both magnetron and Continuity heater thermostat Voltage heater thermostat Fuse does not open Defective line Check continuity Replace Continuity filter borard of noise filter board Check continuity Open power Replace of power supply...
  • Page 35 (TROUBLE 4) No microwave oscillation even though fan motor rotates. Condition Result Cause Remedy Check No microwave Check continuity Continuity oscillation of high voltage fuse Check continuity Continuity Defective Replace of high voltage high voltage capacitor terminals transformer with wires removed Continuity Replace Check continuity...
  • Page 36 Condition Result Cause Remedy Check Display does Check each button Malfunction of Normal Replace not show for continuity the touch control control box program ming tach switch deyboard circuity of control main at all, even as the following assembly if button key is keyboard check main-assembly pressed...

  • Page 37: 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 25).

  • Page 38: 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 39: Printed Wiring Board

    PRINTED WIRING BOARD 1. CIRCUIT CHECK PROCEDURE 1) Low voltage transformer (DMR-814P) check. The low voltage transformer is located on the P.C.B. Measuring condition: Input voltage:120V Frequency : 60Hz 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 40 2) Display prolems CAUSE MEASUREMENT RESULT REMEDY Poor contact between 1. Check the voltage of PIN 2.6 VAC Fix the Pin 1 & P.C.B and display 1 & PIN 25. 25 on the filament. P.C.B. The Display has some Refer to “The display Replace P.C.B.
  • Page 41 Fig. 5 MEASUREMENT POINT...
  • Page 42 Fig. 5 MEASUREMENT POINT...
  • Page 43 CHECK METHOD POINT STAGE RELAY “2” ON – 5VDC RELAY “2” OFF –24VDC (2) When pressing “ START ” button, oven lamp turn on. Fan motor and turntable motor rotate and cook indicator in display comes on. * Cause : RELAY “1”does not operate. MICOM -24V CHECK METHOD...
  • Page 44 6) When the digital clock does not operate properly. MICOM POINT WAVEFORM T: 16.67 ms(60Hz) If clock does not keep exact time, you must check Diode D10, transistor Q8.

  • Page 45: Circuit Diagram

    2. P. C. B CIRCUIT DIAGRAM 1) PCB Circuit Diagram...

  • Page 46: Component Information

    3. COMPONENT INFORMATION 1) Transistor(NPN Type) Emitter Base Collecftor 2) Diode and zener diode DIODE Cathode (k) ANODE(A) D1-16 ZENER DIODE Cathode (k) ANODE(A) ZD1-6...

  • Page 47: Printed Circuits Board

    4. PRINTED CIRCUITS BOARD...

  • Page 49: Location No

    5. P.C.B LOCATION NO. 1) PCB PART LIST PART NAME SYMBOL SPECIFICATION PARTCODE Q'TY PCB MAIN M156 M156 3514313851 R CARBON FILM R6,R9,R10,R12,R17 1/4W 1KΩ J RD-4Z102J- R CARBON FILM 1/4W 100Ω J RD-4Z101J- R CARBON FILM 1/4 10KΩ J RD-4Z103J- R CARBON FILM R8,R21...
  • Page 50 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-1 24V 5SC0101109 TRANS POWER LVT1 DMR-814FS 5EPV035301...

  • Page 51: Exploded And Parts List

    EXPLODED AND PARTS LIST 1. Door Assembly DOOR AS : 3511708710 (KOR-816T) 3511707920 (KOR-616T) REF NO. PART NAME PART CODE DESCRIPTION Q’TY REMARK FRAME DOOR 3512202220 KOR-816T 3512202020 KOR-616T BARRIER-SCREENƒT O 3517003140 ACRYLE 1.5T KOR-816T 3517003040 KOR-616T SUPPORTER BARR-SƒT O 3515304400 KOR-816T 3515304600...
  • Page 52 C-PANEL 3516713350 KOR-616T BUTTON START 3516905800 MILKY BUTTON FUNCTION(COOK) 3516905710 SCREW TAPPING 7621301011 T2S PAN 3X10 PW MFZN 3515500910 KOR-816T WINDOW DISPLAY PMMA 3515500810 KOR-616T KNOB VOLUME 3513403810 BUTTON FUNCTION 3516905600 BUTTON FUNCTION(AUTO) 3516905910 PKMPMSWJ00 KOR-816T0A PCB AS PKMPMSUM00 KOR-616T0A...
  • Page 53 3. MAIN UNIT KOR-616T/816T0A F09 F10 F13 F14...
  • Page 54 KOR-616T1A F42 F41...
  • Page 55 KOR-616T/816T0A REF NO PART NAME PART CODE DESCRIPTION Q'TY REMARK COVER WAVE GUIDE 3511403200 CAVITY AS 3516105600 KOR-81150S KOR-816T 3516104800 KOR-61150S KOR-616T COUPLER 3517400600 GUIDE ROLLER AS 3512510600 KOR-61150S TRAY 3517203500 GLASS KOR-816T 3517203600 KOR-616T CABINET 3510801400 PCM T0.6 KOR-816T 3510801300 KOR-616T SCREW TAPPING...
  • Page 56 KOR-616T1A REF NO PART NAME PART CODE DESCRIPTION Q'TY REMARK COVER WAVE GUIDE 3511403200 CAVITY AS 3516104800 KOR-61150S COUPLER 3517400600 GUID ROLLER AS 3512510600 KOR-61150S TRAY 3517203600 GLASS CABINET 3510801300 PCM T0.6 SCREW TAPPING 7S312X40A1 T1 TRS 4X10 SE MFZN SCREW SPECIAL 3516003700 TT3 HEX FG 4X8 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. : R616T0A001 PRINTED DATE: Oct. 1998...

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