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Service Manual
Microwave Oven
KOR-61155
KOR-61151
DAEWOO ELECTRONICS CO., LTD.
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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) Mark 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 lat
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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. For Safe Operation Damage that allows the microwave energy (that cooks or heats the food) to escape will result in poor cooking and may cause serious bodily injury to the operator. IF ANY O
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SPECIFICATIONS ITEM SPECIFICATION POWER SUPPLY 120V~60Hz, SINGLE PHASE WITH EARTHING POWER CONSUMPTION 920 W MICROWAVE OUTPUT POWER 600 W (IEC 705) (FULL MICROWAVE POWER) FREQUENCY 2450 MHz OUTPUT DIMENSIONS (W X H X D) 465 X 274 X 360 mm (18.3 X 10.8 X 14.2 in.) CAVITY DIMENSIONS (W X H X D) 290 X 200 X 290 mm (11.4 X 7.9 X 11.4 in) NET WEIGHT APPROX. 12.5 kg (27.6 Ibs.) TIMER 35 min. DUAL SPEED POWER SELECTIONS 5 LEVELS CAVITY VOLUME 0.64 Cu.Ft. * Specifications are subject to change without n
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FEATURES DIAGRAM 2 4 1 9 12 11 8 3 5 6 7 ¤ Safety Interlock System ¤Ł Door Viewing Screen - Allows viewing of food. The screen is designed so that light can pass through, but not the microwave. ¤Ø Door Hook - When the door is closed, it will automatically shut. If the door is opened while the oven is operating, the magnetron will immediately stop operating. ¤Œ Oven Cavity ¤º Door Seal - Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage. ¤ Glass Cooki
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INSTALLATION Steady, flat location 1 This microwave oven should be set on a steady, flat surface. Leave space behind and side 2 All air vents should be kept a clearance. If all vents are covered during operation, the oven may overheat and, eventually, cause oven failure. Away from radio, and TV sets 3 Poor television reception and radio interference may result if the oven is located close to a TV, Radio or antenna, feeder and so on. Away from heating appliances and water taps 4 Keep the oven a
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OPERATION Connect the main lead to an electrical outlet. 1 After placing the food in a suitable container, open the oven door and put it on the glass tray. The glass tray must 2 always be in place during cooking. Close the door securely. 3 Choose cooking power by setting V.P.C. Knob to the desired position. 4 Refer to cookbook for recommended power levels. Determine cooking time. Consult cookbook for recipe timing. 5 ¢” Oven light turns on and cooling fan starts to operate. Microwave cooking
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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. 2. The water is contained in a cylindrical borosilicate glass vessel having a maximum material thic
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MICROWAVE RADIATION TEST WARNING • Make sure to check the microwave leakage before and after repair of 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. • Care should be taken not to place the eyes in direct line with the source of microwave energy. • Slowly approach the unit under test until the radiometer reads an
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KOR-6115 WIRING DIAGRAM 10 PRIMARY TIMER ASS'Y INTERLOCK HIGH VOLTAGE TIMER TRANSFORMER SWITCH(UPPER) V.P.C. FUSE SWITCH 1 3 RD WH RD RD 2 BK POWER SUPPLY : GY LIVE GY SINGLE PHASE~ONLY OR OR GY H.V. INTERLOCK CAPACITOR MONITOR TM CL GM FM GN SWITCH M NEUTRAL MAGNETRON GY GY BK H.V. DIODE GY BL WH WH SECONDARY INTERLOCK SWITCH NOTE : RD : RED OR : ORANGE CL : CAVITY LAMP [ CONDITION ] WH : WHITE BL : BLUE FM : FAN(BLOWER) MOTOR DOOR : CLOSED BK : BLACK GY : GRAY GM : GEARED MOTOR TIMER : ON GN
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KOR-61151 WIRING DIAGRAM 11 PRIMARY TIMER ASS'Y CAVITY HIGH VOLTAGE INTERLOCK TIMER THERMOSTAT SWITCH(UPPER) TRANSFORMER V.P.C. SWITCH 3 1 RD WH RD 2 BK POWER SUPPLY : RD GY GY SINGLE PHASE~ONLY OR OR GY FILTER ASS’Y FUSE H.V. INTERLOCK L L CAPACITOR MONITOR TM CL GM FM NN SWITCH GN GN M MAGNETRON GY GY WH H.V. DIODE BK GY BL WH SECONDARY INTERLOCK SWITCH NOTE : RD : RED OR : ORANGE CL : CAVITY LAMP [ CONDITION ] WH : WHITE BL : BLUE FM : FAN(BLOWER) MOTOR DOOR : CLOSED BK : BLACK GY :
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CIRCUIT DESCRIPTION 1. When the food is placed in the oven cavity and door is closed. • The contact of the interlock monitor switch open. • The contacts of the primary interlock switch and secondary interlock switch close. Primary Interlock Timer Switch Switch 15A Fuse Interlock Monitor TM CL GM FM Switch Secondary Interlock Switch Timer motor Cavity lamp Geard motor Fan motor CL GM FM TM Fig. 1 2. When the timer is set to the time desired. • The contact of the timer switch close. • Oven lamp tu
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MAGNETRON HIGH VOLTAGE TRANSFORMER H.V. FUSE H.V. CAPACITOR H.V. DIODE Fig. 2 3. When the door is opened during cooking. • Primary interlock switch and secondary interlock switch open to cut off the primary voltage to the high voltage transformer to stop microwave oscillation. • Fan motor, timer motor and turntable motor stop rotating. • Oven lamp turn off. • As soon as the door is opened, monitor switch close (NC) to create the short circuit. If the contacts of primary interlock switch and seco
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PRECAUTIONS FOR DISASSEMBLY AND REPAIR ƒ¡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. (1) Always remove the power plug from the outlet before servicing.’ (2) Use an insulated scr
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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. 1 (2) Remove the door assembly ¤Ø from top plate of cavity. 3 (3) Remove the above for reassembly. 2 NOTE : After replacing the door perform a check of correct alignment with the hinge and cavity front face. 3. To remove door parts 1 2 3 4 5 6 7 8 15
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(1) Remove the gasket door ¤ from door plate ¤Œ. (2) Remove the barrier screen inner ¤ºfrom door plate ¤Œ. (3) Remove the door frame ¤Łfrom door plate ¤Œ. (4) Remove the stopper hinge top ¤Øfrom door plate ¤Œ. (5) Remove the spring ¤ and the hook ¤ . (6) Remove the barrier screen outer ¤ from door frame ¤Ł. (7) Remove the above steps for reassembly. 4. Method to reduce the gap between the door seal and the oven front surface. (1) To reduce gap located on part ‘A’. 1) Loosen two screws on stopper
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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. 5 2 Control Panel 7 6 3 8 4 1 10 9 (2) Remove the door open lever ¤ from the control panel. (3) Remove two screws ¤Łwhich secure the timer assembly ¤Ø. (4) Remove the timer assembly ¤Ø. (5) Pull out the timer knob ¤Œ from the timer assembly ¤Ø. (6) Pull out the timer coupler ¤ºfrom the timer assembly ¤Ø. (7) Remove the screw ¤ which secure the
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6. To remove high voltage capacitor (1) Remove a screw ¤ which secure the grounding 1 ring ring terminal of the H.V. diode ¤Łand the capacitor holder ¤Ø. 3 (2) Remove the H.V. diode ¤Łfrom the capacitor ¤Ø. (4) Reverse the above steps for reassembly. 2 High voltage circuit wiring Magnetron H.V. Capacitor H.V. Diode H.V. Transformer 7. To remove magnetron (1) Remove four screws ¤ which secure the magnetron ¤Ł. (2) Remove the magnetron ¤Ł. (3) Reverse the above steps for reassembly. 18
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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 2 leakage. It shall not exceed 4mW/cm for a fully assembled oven with door normally closed. Magnetron Antenna Metallic Wave Guide Magnetron Antenna Gasket Plate Cooling Fin Metallic Gasket Plate Filament Magnetron Terminal 8. To remove fan motor assembly (1) Remove two screws ¤ which secu
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INTERLOCK MECHANISM 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. If the door is not closed properly, the oven will not operate. When the door is closed, the hook pushes the button of the micro switch. Then the button of the
