S/M No.: R180A0A002 Service Manual Microwave Oven Model : KOR-180A0A KOR-181G0A DAEWOO ELECTRONICS CO., LTD. http://svc.dwe.co.
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 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.
SPECIFICATIONS MODEL KOR-180A, KOR-181G POWER SUPPLY 120V~60HZ, SINGLE PHASE WITH EARTHING POWER CONSUMPTION MICROWAVE 1500 W GRILL COMBINATION MICROWAVE ENERGY OUTPUT 1100 W MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 589X339X488mm (23.2X13.3X19.2 in.) CAVITY DIMENSIONS (W X H X D) 399X278X451mm (15.7X10.9X17.8 in.) NET WEIGHT APPROX. 18kg (39.7 lbs.) TIMER 99min. 99sec. FUNCTION SELECTIONS MICROWAVE POWER SELECTIONS 10 LEVELS CAVITY VOLUME 1.8 Cu.
EXTERNAL VIEW 1.
2. FEATURE DIAGRAM KOR-180A0A 1. DOOR SEAL Door seal maintains the microwave within the oven cavity and prevents microwave leakage. 2. DOOR HOOK When door is closed, it will automatically lock shut. If door is opened while oven is operating, magnetron tube will immediately stop operating. 3. DOOR SCREEN Allows viewing of food. Microwave cannot pass through perforations in screen. 4. SPATTER SHIELD Protects the microwave outlet from splashes of cooking foods. 5.
3. CONTROL PANEL (1) KOR-180A0A KOR-180A0A 1. Time set pad - Used to set the cooking time and the present time. 2. Display - Cooking time, power level, indicators and present time are displayed. 3. One touch - Used to cook or reheat specific quantities of food. 4. Auto cook - Used to cook or reheat. 5. More - Used to add time to cooking. 6. Less - Used to remove time from cooking. 7. Auto Defrost - Used to defrost foods.(for weight) 8. Power - Used to set power level. 9. Defrost - Used to defrost foods.
(2) KOR-181G0A M/W DEF TIMER LOCK lb MICROWAVE OVEN KOR-181G 1. BREAD 2. SOUP 3. BAKED POTATO 4. FRESH VEGETABLE 5. FROZEN VEGETABLE POPCORN MORE FROZEN PIZZA LESS AUTO COOK DINNER PLATE AUTO DEFROST MEAT POULTRY POWER DEFROST FISH 1 2 3 4 5 6 7 8 9 0 KITCHEN TIMER CLOCK STOP/ START/ CLEAR SPEEDY COOK 1. Time set pad - Used to set the cooking time and the present time. 2. Display - Cooking time, power level, indicators and present time are displayed. 3.
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 be overheated and, eventually, cause oven 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.
OPERATIONS AND FUNCTIONS 1. Connect the main 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 must always be in place during cooking. 3. Close the door securely. 4. The oven door can be opened at any time during operation by touching the door release button on the control panel. The oven will automatically shut off. To restart the oven, close the door and then touch START. 5.
DISASSEMBLY AND ASSEMBLY - Cautions to be observed when trouble shooting. 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) Push 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. REF NO. A01 A02 A03 A04 A05 A06 A07 A08 PART CODE 3512205100 3512203900 3517007400 3517005320 3515204400 3511710500 3517005200 3512301800 3513101400 3515101900 PART NAME DESCRIPTION FRAME DOOR ABS SG-175, SG-0760D BARRIER-SCREEN*O SAN T1.5 STOPPER HINGE *T AS DOOR PAINTING AS BARRIER-SCREEN*I GASKET DOOR HOOK SPRING HOOK KOR-162J0A KOR-180A PE T0.1 PP POM PW-1 (1) Remove the gasket door from door plate. (2) Remove the barrier screen inner from door plate.
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 stopper hinge top, and then push the door to contact the door seal to oven front surface. Tighten two screws. (2) To reduce gap located on part B . Loosen two screws on stopper hinge under, and then push the door to contact the door seal to oven front surface. Tighten two screws. NOTE : A small gap may be acceptable if the microwave leakage does not exceed 4mW/cm2.
5. To remove control panel parts. REF NO. A01 A02 A03 A04 A05 A06 A07 PART CODE 3518522800 3518522810 3516726000 3516719100 PKMPMSXL00 7122401211 3513702800 441G430171 3516909600 PART NAME DESCRIPTION KOR-180A0A KOR-181G2A SWITCH MEMBRANE CONTROL PANEL ABS AF-348, VT-0826 PCB AS SCREW TAPPING LEVER DOOR OPEN BUTTON SPRING BUTTON DOOR OPEN KOR-161G2A T2S TRS 4X12 MFZN PP SWP DIA 0.
6. To remove high voltage capacitor. 1) Remove a 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 a screw which secure the magnetron. 2) Remove the magnetron. 3) Reverse the above steps for reassembly.
8. To remove wind guide assembly. 1) Remove a screw which secure the wind guide assembly. 2) Draw forward the wind guide assembly. 3) Pull the fan from the motor shaft. 4) Remove two screws which secure the motor shaded pole. 5) Remove the motor shaded pole. 6) Reverse the above steps for reasembly. 9. To remove H.V.transformer. 1) Remove four screws holding the H.V.transformer. 2) Remove the H.V.transformer. 3) Reverse the above steps for reassembly.
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. (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 microswitch.
TROUBLE SHOOTING 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 tranformer, disconnect one load 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 power supply cord No Continuity Open power supply cord Replace Normal Defective touch control circuit Replace Malfunction of secondary interlock switch Replace Display do not shown countdown NOTE1 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 inditions indicate a probable defective touch control circuit or membrane switch assembly 1. 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. 2. A distinct change in the display are not on when they numbers is the display. M/W DEF TIMER LOCK lb 3. One or more digits in the display are not on when they should be. 4.
MEASUREMENT AND TEST 1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT Microwave output power can be checked by indirectly mmeasuring 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 100 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. 2) Normal readings should be as follows : Secondary winding ...
WIRING DIAGRAM 26
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: 120V / Frequency: 60Hz Terminal Voltage LOAD NO LOAD 4-7 AC 12.6 V AC 14.7 V NOTE 1. Refer to Ciruit Diagram (point 4). 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 2.
MP1 MP2 Mesure point 28
3. When there is no microwave oscillation 1) When touching START pad, oven lamp does not turn on. Fan motor do not rotate, but cook indicator in display comes on. Cause : RELAY 2 does not operate. refer to Circuit Diagram (point 3) - Check method POINT A STATE B RELAY 2 ON -5VDC GND RELAY 2 OFF GND -12VDC 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.
2.
3. P.C.B. LOCATION NO.
EXPLODED VIEW AND PARTS LIST 1. DOOR ASSEMBLY Refer to Disassembly and assembly 2. CONTROL PANEL ASSEMBLY Refer to Disassembly and assembly 3.
REF NO A00 B00 PART CODE PART NAME DESCRIPTION Q’TY 3511715500 DOOR AS KOR-180A0A 1 3511715510 DOOR AS KOR-181G0A 1 PKCPSWAC00 CONTROL-PANEL AS KOR-180A0A 1 PKCPSWAC50 CONTROL-PANEL AS KOR-181G0A 1 F01 3510802400 CABINET SECC T0.
REF NO PART CODE PART NAME DESCRIPTION F33 3513814300 LOCK POM BLACK 1 F34 3513601500 LAMP BL 125V 25W T25 C5A #187 1 F35 7121400611 SCREW TAPPING T2S PAN 4X6 MFZN 1 F36 3966820200 MOTOR SYNCRO 120V 2W GM-16-12F17 1 F37 3518905300 THERMOSTAT OFF:75 ON:65 H #187 NB 1 F38 3513003400 HOLDER THERMOSTAT PBT 1 F39 7272400811 SCREW TAPTITE TT3 TRS 4X8 MFZN 2 F40 3511406220 COVER WAVE GUIDE PP J640A WHITE 1 F41 3517400620 COUPLER XAREC 1 F42 3514700710 ROLLER TEFR
DAEWOO ELECTRONICS CO., LTD. 686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O BOX 8003 SEOUL, KOREA TELEX: DWELEC K28177-8 CABLE: “DAEWOOELEC” S/M NO.
