S/M No. : Service Manual Microwave Oven Model: KOG-8A275S KOG-8A275S39 KOG-8A275S40 ✔ Caution : In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr). Nov.
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.
SAFETY AND PRECAUTIONS 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 OF THE FOLLOWING CONDITIONS EXIST, OPERATOR MUST NOT USE THE APPLIANCE. (Only a trained service personnel should make repairs.) (1) A broken door hinge. (2) A broken door viewing screen. (3) A broken front panel, oven cavity. (4) A loosened door lock. (5) A broken door lock.
SPECIFICATIONS POWER SUPPLY POWER CONSUMPTION 230V AC, 50Hz SINGLE PHASE WITH EARTHING MICROWAVE 1200 W GRILL 1050 W COMBINATION 2200 W MICROWAVE ENERGY OUTPUT 800W MICROWAVE FREQUENCY 2,450MHz OUTSIDE DIMENSIONS (WXHXD) 465 x 287 x 368mm CAVITY DIMENSIONS (WXHXD) 298 x 230 x 330mm CAVITY VOLUME 23 L NET WEIGHT APPROX. 12.7Kg TIMER 35 min. DUAL SPEED POWER SELECTIONS 5 Levels * Specifications are subject to change without notice.
EXTERNAL VIEW 1.
2. FEATURES DIAGRAM 1 2 3 4 5 6 7 ew 9 q 8 0 1 Door seal - Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage. 2 Reflector (Insulator Heater) 3 Heating Element 4 Oven cavity 5 Safety interlock system 6 Knob V.P.C - Used to select a microwave power level. 7 Knob timer - Used in setting cooking time for all functions. 8 Metal rack 9 Coupler - This fits over the shaft in the centre of the ovens cavity floor. This is to remain in the oven for all cooking.
INSTALLATION 1. Steady, flat location This microwave oven should be set on a steady, flat surface. 2. Leave space behind and side All air vents should be kept a clearance. If all vents are covered during operation, the oven may overheat and, eventually, cause failure. 3. Away from radio, and TV sets Poor television reception and radio interference may result if the oven is located close to a TV, radio, antenna, or feeder and so on. Position the oven as far from them as possible. 4.
OPERATION AND FUNCTIONS This section includes useful information about oven operation. 1. Connect the mains lead to an electrical 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. 3. Close the door. Make sure that it is firmly closed. When the oven door is opened, the light turns off. The oven door can be opened at any time during operation by pulling the door.
DISASSEMBLY AND ASSEMBLY Cautions to be observed when troubleshooting. Unlike many other appliances, the microwave oven is high-voltage, high-current equipment. It is completely safe 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.
1. To remove cabinet 1) Remove three screws on cabinet back. 2) Pull the cabinet backward. 2. To remove door assembly 1) Remove two screws which secure the stopper hinge top. 2) Remove the door assembly from top plate of cavity. 3) Reverse the above for reassembly. NOTE : After replacing the door assembly, perform a check of correct alignment with the hinge and cavity front plate.
3. Method to reduce the gap between the door seal and the oven front surface. (1) To reduce gap located on part ‘A’ • Loosen two screws on the stopper hinge top, and then push the door to contact the door seal to the oven front surface. • Tighten two screws. (2) To reduce gap located on part ‘B’ • Loosen two screws on the stopper hinge under, and then push the door to contact the door seal to the oven front surface. • Tighten two screws.
4. To remove door parts. DOOR ASSEMBLY : 3511725160 REF. NO PART CODE PART NAME DESCRIPTION A01 3517009830 BARRIER-SCREEN *O SAN 1.5T 1 A02 3512210230 FRAME DOOR HIPS SG-970, HG-1760H 1 A03 3515204100 STOPPER HINGE *T AS KOR-63150S 1 A04 3511719500 DOOR PAINTING AS KOR-6C0B5S 1 A05 3517002800 BARRIER-SCREEN *I POLYESTER T0.
5. To remove control panel parts. C/PANEL ASSEMBLY : 3516735530 REF. NO PART CODE PART NAME DESCRIPTION Q'TY B01 3513411220 KNOB VPC ABS SG-0760D SG-175 1 B02 3516735440 CONTROL-PANEL HIPS SG-970,HG-1760H 1 B03 4415A17352 SW MICRO VP-533A-OF SPNO #187 200G 1 B04 3512766301 HARNESS TIMER KOG-37150S 1 B05 3515101600 SPRING FLAT SUS 301 T0.
6. To remove high voltage capacitor. 1) Remove the screw which secure the grounding ring terminal of the H.V. diode and the capacitor holder. 2) Remove the H.V. diode from the capacitor holder. 3) Reverse the above steps for reassembly. ◆ High voltage circuit wiring 7. To remove magnetron. 1) Remove the screw which secure the magnetron. 2) Remove the magnetron. 3) Reverse the above steps for reassembly.
8. To remove wind guide assembly. 1) Remove the screw for earthing. 2) Remove the noise filter from the wind guide. 3) Remove the screw which secure the wind guide assembly. 4) Draw forward the wind guide assembly. 5) Pull the fan from the motor shaft. 6) Remove two screws which secure the motor shaded pole. 7) Remove the motor shaded pole. 8) Reverse the above steps for reassembly. 9. To remove H.V.transformer. 1) Remove four screws holding the H.V.transformer. 2) Remove the H.V.transformer.
10. To remove tray motor. 1) Remove the coupler in the cavity. 2) Turn the set upside down. 3) Cut the tray motor cover part from the base plate. 4) Remove the tray motor cover. 5) Remove a screw which secure the tray motor. 6) Remove the tray motor. 7) Reverse the above steps for reassembly except for securing the tray motor cover with screw. 11. To remove heater assembly. 1) Remove the three nuts. 2) Remove the insulator heater assembly. 3) Reverse the above steps for reassembly.
12. To remove heater parts. REF. NO PART CODE PART NAME DESCRIPTION Q'TY C01 7392500013 NUT HEX 6N-2-5 MFCR 1 C02 3515001200 SPACER INSULATOR *I C3771BD A=24.2 2 C03 3513301100 INSULATOR HEATER SPP T0.
INTERLOCK MECHANISM AND ADJUSTMENT 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.
TROUBLESHOOTING GUIDE Following the procedure below to check if the oven is defective or not. 1. Check grounding before trouble checking. 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. To do otherwise may result in a false reading or damage to your meter.
Does the fan motor work when you shut the door and turn the timer? YES Does the oven lamp light? Does the turntable turn? NO Replace or repair oven lamp, turntable motor. YES Normal reading should be approx. 0Π If microwave do not oscillate, check continuity of filament of magnetron. NO Continuity Check continuity filament tap (3.3V) of high voltage. No Continuity Replace high Voltage transformer Continuity Poor continuity Check continuity filament tap (3.3V) of high voltage.
MEASUREMENT AND TEST 1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT 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 1000±5cc of potable water. 2.
2. MICROWAVE RADIATION TEST CAUTION : 1. Make sure to check the microwave leakage before and after repair of adjustment. 2. Always start measuring of an unknown field to assure safety for operating personnel from microwave energy. 3. Do not place your hands into any suspected microwave radiation field unless the safe density level is known. 4. Care should be taken not to place the eyes in direct line with the source of microwave energy. 5.
3. COMPONENT TEST PROCEDURE • High voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle. • It is neither necessary nor advisable to attempt measurement of the high voltage. • Before touching any oven components or wiring, always unplug the oven from its power source and discharge the capacitor. 1. High voltage transformer (1) Remove connections from the transformer terminals and check continuity.
WIRING DIAGRAM 23
EXPLODED VIEW AND PARTS LIST 1. DOOR ASSEMBLY Refer to Disassembly and assembly 2. CONTROL PANEL ASSEMBLY Refer to Disassembly and assembly 3.
✔ Caution : In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr).
✔ Caution : In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr).
DAEWOO ELECTRONICS CORP. 1-2, Jeo-dong 1(il)-ga, Jung-gu, Seoul, Korea C.P.O. BOX 8003 SEOUL, KOREA TELEX: DWELEC K28177-8 CABLE: “DAEWOOELEC” S/M NO. : PRINTED DATE: Nov.
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