S/M No. : Service Manual Microwave Oven Model: KOR-6L4B3W ✔ 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). Oct.
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 230V AC, 50Hz SINGLE PHASE WITH EARTHING POWER SUPPLY MICROWAVE INPUT POWER 1000 W ENERGY OUTPUT 700 W FREQUENCY 2,450 MHz OUTSIDE DIMENSIONS (W x H x D) 446 x 270 x 320 mm CAVITY DIMENSIONS (W x H x D) 295 x 219 x 303 mm CAVITY VOLUME 20 L NET WEIGHT APPROX. 10.2 Kg TIMER 59 min. 90 sec. POWER SELECTIONS 10 Levels * Specifications are subject to change without notice.
EXTERNAL VIEW 1.
2. FEATURES DIAGRAM 1 Door latch - When the door is closed, it will automatically shut off. If the door is opened while the oven is operating, the magnetron will automatically shut off. 2 Door seal - The door seal surfaces prevent microwaves escaping from the oven cavity. 3 Oven cavity 4 Control panel 5 Coupler - This fits over the shaft in the center of the oven cavity floor. This is to remain in the oven for all cooking.
3. CONTROL PANEL 1 2 4 5 3 6 7 8 9 1 DISPLAY - Cooking time, power level, indicators and the current time are displayed. 2 AUTO COOK - Used to cook or reheat many of favorite food. 3 DEFROST - Used to defrost foods for time and weight. 4 POWER - Used to set power level. 5 CLOCK - Used to set clock. 6 ONE TOUCH COOK - Used to cook or reheat specific quantities of food. 7 TIME SET PAD - Used to set the cooking time and the current time.
INSTALLATION 1. Steady, flat location This microwave oven should be set on a steady, flat surface. This microwave oven is designed for counter top use only. 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.
OPERATIONS AND FUNCTIONS 11. Connect the mains lead to an electrical outlet. 12. 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. 13. Close the door securely. 14. The oven door can be opened at any time during operation by pulling the door. The oven will automatically shut off. To restart the oven, close the door and then touch the START pad. 15. Each time a pad is touched.
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 four 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. To remove door parts. A05 A04 A03 A01 A02 A06 A07 REF No. PART CODE PART NAME DESCRIPTION A00 3511730150 DOOR AS KOR-6L455S 1 A01 3511730140 DOOR SUB AS KOR-6L455S 1 A02 3515204120 STOPPER HINGE *T AS KOR-6L0B1A 1 A03 3511706130 DOOR PAINTING AS KOR-6L0B1A 1 A04 3517003700 BARRIER SCREEN *I PE T0.1 1 A05 3512302700 GASKET DOOR PP 1 A06 3513818900 LOCK PP FH44D GP-3152F 1 A07 3515101300 SPRING HOOK PW1 1 1) Remove the gasket door from the door painting as.
4. 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.
5. To remove control panel parts. B04 B03 B02 B01 B05 B06 B07 REF No. PART CODE PART NAME DESCRIPTION B00 PKCPSWFLZ0 CONTROL-PANEL AS KOR-6L4B3W 1 B01 3518572870 SWITCH MEMBRANE KOR-6L4B5S 1 B02 3516739880 CONTROL-PANEL SUB AS KOR-6L4B5S 1 B03 PKMPMSFLD0 PCB MAIN MANUAL AS KOR-6L0B3W 1 B04 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 1 B05 3513702700 LEVER DOOR OPEN PP 1 B06 441G430171 SPRING BUTTON SWP DIA. 0.
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 three screws 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.
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.
CONDITION Outlet has proper voltage Fuse does not blow. CHECK RESULT CAUSE REMEDY No Continuity Defective magnetron Replace Check continuity of magnetron Check continuity of noise filter board No Continuity Defective magnetron Replace Check continuity of power supply cord No Continuity Open power supply cord Replace Normal Defective touch control circuit Replace NOTE All these switches must be replaced at the same time, please refer to Interlock Mechanism And Adjustment .
(TROUBLE 3) No microwave oscillation even though fan motor rotates.
(TROUBLE 4) The following visual conditions indicate a probable defective touch control circuit or membrane switch assembly. 11. Incomplete segments (1) Segments missing (2) Partical segments missing (3) Digit flickering other than normal display slight flickering (4) :0 does not display when power is on. 12. A distinct change in the display is not on when they numbers is the display. 13. One or more digits in the display are not on when they should be. 14.
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. A cylindrical container of borosilicate glass is used for the test. It has a maximum thickness of 3mm, an external diameter of approximately 190mm and a height of approximately 90mm. The mass of the container is determined. 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 24
PRINTED CIRCUIT BOARD 1. CIRCUIT CHECK PROCEDURE 1. Low Voltage Transformer check The low voltage transformer is located on the P.C.B. Measuring condition: input voltage : 230V/Frequency : 50Hz Terminal Voltage (4,5)-6 or (7,8)-6 LOAD AC 14 V NO LOAD AC 17 V NOTE : 1. Refer to Circuit Diagram. 2. Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source voltage. 3. The allowable tolerance of the secondary voltage is within 5% of nominal voltage. 2.
MP1 MP2 GND Measure Point 26
3. When there is no microwave oscillation 1) When touching the START pad, oven lamp does not turn on. Fan motor does not rotate, but cook indicator in display comes on. - Check method POINT A B RELAY 2 ON 5VDC GND RELAY 2 OFF GND 15VDC STATE 2) When touching the START pad, oven lamp turns on. Fan motor and turntable rotate and cook indicator in display comes on. - Check method POINT A B RELAY 1 ON 5VDC GND RELAY 1 OFF GND 15VDC STATE 4.
2.
3. PCB LOCATION NO. NO NAME SYMBOL SPECIFICATION PART CODE Q’TY 1 BUZZER BZ1 BM-20K 3515600100 1 2 CAPACITOR CERAMIC C1,2,3,8,9 50V 0.
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). REF.
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: Oct.
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