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) 590-6291 TEL: 02) 360-7114/590-6151~5 http://www.dwe. daewoo.co.kr S/M NO.
Service Manual Microwave Oven Model: K O R - 9 7 1 M 0 A KOR-971Q0A DAEWOO ELECTRONICS CO., LTD.
@@@@@@@@@@@@@@ @?h@ @?h@?e@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
PROPER USE AND SERVICE 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 120V ~ , 60Hz MICROWAVE POWER CONSUMPTION 1,250 W OUTPUT POWER 950 W (IEC 705) FREQUENCY 2,450 MHz OUTSIDE DIMENSIONS (W X H X D) 526 (20.7) X 345 (13.6) X 382 (15) mm (inch) CAVITY DIMENSIONS (W X H X D) 335 (13.2) X 254 (10) X 358 (14.1) mm (inch) NET WEIGHT Approx. 18 kg (40 Ibs.) TIMER 99 min 99 sec. SELECT FUNCTION Microwave / Auto defrost / Auto cook MICROWAVE POWER LEVEL 10 stages * Specifications are subject to change without notice.
NAMES AND FUNCTION OF PARTS 1 2 3 4 5 9 6 7 8 ¤ Door latch ƒ¡ When the door is closed it will automatically lock shut. If the door is opened while the oven is operating. The magnetron will automatically shut off. ¤ Door release button ƒ¡Pushing this button stops oven operation and opens the door. ¤ Glass cooking trayƒ¡Made of special heat resistant glass. The tray must always be in proper position before operating. Do not cook food directly on the tray.
CONTROL PANEL KOR-971M0A STAGE 1 2 LOCK DEFROST AUTO WEIGHT TIME START NO CUPS g cook Auto Menu 1. Baked Potato 2, Fish Vegetable 3. Soup 4. Fish Fillets 5. Meat Loaf Frozen pizza - Used to reheat frozen pizza. frozen pizza Feeding Bottle - Used to sterilize feeding bottles. Stop/Clear - Used to stop the oven operation or to delete the cooking data. Muffin - used to cook muffin. Speedy co o k Auto def. Power Beverage - Used to reheat beverage.
KOR-971Q0A STAGE 1 2 LOCK NO DEFROST AUTO WEIGHT TIME START CUPS g MICROWAVE OVEN RANGE KOR-971Q Beverage - Used to reheat beverage. Soup - Used to reheat soup. Beverage Soup Dinner plate Frozen Pizza Muffin Baked potato Muffin - used to cook muffin. Fresh Vegetable more le s s Auto def. Speedy c o o Power - Used to set power level. Power Clock/ A.Start Feeding Bottle Feeding Bottle - Used to sterilize feeding bottles.
EARTHING INSTRUCTIONS This appliance must be earthed. In the event of an electrical short circuit, earthing reduces the risk of electric shock by providing an escape, wire for the electric current. This appliance is equipped with a cord having a earthing wire with a earthing plug. The plug must be plugged into an outlet that is properly installed and earthed.
OPERATION PROCEDURE This section includes useful information about oven operation. 1. Plug power supply cord into a standard 120V AC 60Hz power outlet socket. 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. Shut the door. Make sure that it is firmly closed. When the oven door is opened, the light turns off.
HOW TO SET THE OVEN CONTROL(KOR-971M0A) SETTING THE CLOCK When the oven is first plugged in, the display will flash “ :0” and a tone will sound. If the AC power ever goes off, the display will flash “ :0” when the power comes back on. DO THIS... THIS HAPPENS... This is a 12 hour clock system. CLOCK / A. START STAGE 1 2 DEFROST WEIGHT TIME AUTO START 1. Touch CLOCK/A.START pad. LOCK NO CUPS g This is a 24 hour clock system. CLOCK / A.
WEIGHT DEFROSTING WEIGHT DEFROST lets you easily defrost food by eliminating guesswork in determining defrosting time. The minimum weight for WEIGHT DEFROST is 200g. The maximum weight for WEIGHT DEFROST is 3000g. Follow the steps below for easy defrosting. DO THIS... THIS HAPPENS... AUTO DEFROST STAGE 1 2 DEFROST WEIGHT TIME AUTO START The WEIGHT DEFROST indicator lights and “0” is displayed. And the “Ib” indicator starts blinking. 1. Touch AUTO DEFROST pad.
TIME DEFROSTING When TIME DEFROST is selected, the automatic cycle divides the defrosting time into periods of alternating defrost and stand times by cycling on and off. DO THIS... THIS HAPPENS... AUTO DEFROST STAGE 1 2 DEFROST WEIGHT TIME AUTO START The WEIGHT DEFROST indicator lights and “0” is displayed. And the “g” indicator starts blinking. 1. Touch AUTO DEFROST pad.
COOKING IN ONE STAGE DO THIS... THIS HAPPENS... POWER STAGE 1 2 DEFROST WEIGHT TIME AUTO START The STAGE1 indicator lights and “P-” is displayed. 1. Touch POWER pad. LOCK 3 NO STAGE 1 2 CUPS g DEFROST WEIGHT TIME AUTO START 2. Touch the number pad for the power level you want. The display will show what you touched. This example shows power level 3.
COOKING IN TWO STAGES 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. Your microwave oven can be set to change from one to another. DO THIS... 5 3 THIS HAPPENS... 0 STAGE 1 2 DEFROST WEIGHT TIME AUTO START 1. Touch number pads for the cooking time you want in the first stage.
WEIGHT DEFROSTING AND COOKING IN TWO STAGES Some recipes require frozen foods to be thawed before cooking. This oven can be programmed to automatically defrost foods before cooking. DO THIS... THIS HAPPENS... STAGE AUTO DEFROST 1 2 DEFROST WEIGHT TIME AUTO START The WEIGHT DEFROST indicator lights and “0” is displayed. And the “lb” indicator starts blinking. 1. Touch AUTO DEFROST pad.
DO THIS... THIS HAPPENS... POWER STAGE 1 2 DEFROST WEIGHT TIME AUTO START The STAGE2 indicator lights and “P-” is displayed. 6. Touch POWER pad. LOCK 8 NO STAGE 1 2 CUPS g DEFROST WEIGHT TIME AUTO START The display will show what you touched. 7. Touch the number pads for the power level you want in the second stage. LOCK 4 2 0 NO STAGE 1 2 CUPS g DEFROST WEIGHT TIME AUTO START 8. Touch the number pads for the cooking time you want in the second stage. LOCK START 9.
AUTO START Allows you to program cooking to start at a time you select. The food will automatically start cooking at the desired time. Program is able up to 2 stages (not acceptable DEFROST) DO THIS... THIS HAPPENS... 1. Program the desired power level and cooking time. CLOCK/ A.START STAGE 1 2 DEFROST WEIGHT TIME AUTO START The AUTO START indicator lights and “ :0” is displayed. 2. Touch CLOCK/A.START pad.
FEEDING BOTTLE Feeding Bottle is to use to sterillize feeding bottles. DO THIS... FEEDING BOTTLE THIS HAPPENS... STAGE 1 2 DEFROST WEIGHT TIME AUTO START 1. Touch FEEDING BOTTLE pad. LOCK NO CUPS When you touch Feeding Bottle pad, “2” is displayed. After 1.5 seconds, the display is changed into cooking time of quantity and the oven starts cooking. g *FEEDING BOTTLE* (The number of feeding bottle) ¡ 2 ea : Touch Feeding Bottle once. ¡ 4 ea : Touch Feeding Bottle once twice within 1.5 seconds.
ONE TOUCH COOKING One touch cook allows you to cook or reheat many of your favorite foods by touching just one pad. To increase quantity, touch chosen pad until number in display is same as desired quantity to cook. (except for MUFFIN & DINNER PLATE) DO THIS... FROZEN PIZZA THIS HAPPENS... STAGE 1 2 DEFROST WEIGHT TIME AUTO START 1. Touch FROZEN PIZZA pad. LOCK NO CUPS When you touch FROZEN PIZZA pad, “200” is displayed. After 1.
DO THIS... DINNER PLATE THIS HAPPENS... STAGE 1 2 DEFROST WEIGHT TIME AUTO START 1. Touch DINNER PLATE pad. LOCK NO CUPS When you touch DINNER PLATE pad, “300” is displayed. After the 1.5 seconds, the display changed into cooking time of quantity and the oven starts cooking.
DO THIS... WEIGHT THIS HAPPENS... STAGE 1 2 DEFROST WEIGHT TIME AUTO START 1. Touch WEIGHT pad. LOCK NO glb CUPS * BAKED POTATO* (156g~184g) • 1 NO(ea.) : Touch WEIGHT once. • 2 NO(ea.) : Touch WEIGHT twice within 1.5 seconds. • 3 NO(ea.) : Touch WEIGHT three times within 1.5 seocnds. When you touch WEIGHT pad, “1” is displayed. After 1.5 seconds, the display changed into cooking time of quantity and the oven starts cooking. * SOUP* • 227g : Touch WEIGHT once.
HOW TO SET THE OVEN CONTROL(KOR-971Q0A) SETTING THE CLOCK When the oven is first plugged in, the display will flash “ :0” and a tone will sound. If the AC power ever goes off, the display will flash “ :0” when the power comes back on. DO THIS... THIS HAPPENS... This is a 12 hour clock system. CLOCK / A. START STAGE 1 2 DEFROST WEIGHT TIME AUTO START 1. Touch CLOCK/A.START pad. LOCK NO CUPS g This is a 24 hour clock system. CLOCK / A.
WEIGHT DEFROSTING WEIGHT DEFROST lets you easily defrost food by eliminating guesswork in determining defrosting time. The minimum weight for WEIGHT DEFROST is 200g. The maximum weight for WEIGHT DEFROST is 3000g. Follow the steps below for easy defrosting. DO THIS... THIS HAPPENS... AUTO DEFROST STAGE 1 2 DEFROST WEIGHT TIME AUTO START The WEIGHT DEFROST indicator lights and “0” is displayed. And the “Ib” indicator starts blinking. 1. Touch AUTO DEFROST pad.
TIME DEFROSTING When TIME DEFROST is selected, the automatic cycle divides the defrosting time into periods of alternating defrost and stand times by cycling on and off. DO THIS... THIS HAPPENS... AUTO DEFROST STAGE 1 2 DEFROST WEIGHT TIME AUTO START The WEIGHT DEFROST indicator lights and “0” is displayed. And the “g” indicator starts blinking. 1. Touch AUTO DEFROST pad.
COOKING IN ONE STAGE DO THIS... THIS HAPPENS... POWER STAGE 1 2 DEFROST WEIGHT TIME AUTO START The STAGE1 indicator lights and “P-” is displayed. 1. Touch POWER pad. LOCK 3 NO STAGE 1 2 CUPS g DEFROST WEIGHT TIME AUTO START 2. Touch the number pad for the power level you want. The display will show what you touched. This example shows power level 3.
COOKING IN TWO STAGES 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. Your microwave oven can be set to change from one to another. DO THIS... 5 3 THIS HAPPENS... 0 STAGE 1 2 DEFROST WEIGHT TIME AUTO START 1. Touch number pads for the cooking time you want in the first stage.
WEIGHT DEFROSTING AND COOKING IN TWO STAGES Some recipes require frozen foods to be thawed before cooking. This oven can be programmed to automatically defrost foods before cooking. DO THIS... THIS HAPPENS... STAGE AUTO DEFROST 1 2 DEFROST WEIGHT TIME AUTO START The WEIGHT DEFROST indicator lights and “0” is displayed. And the “lb” indicator starts blinking. 1. Touch AUTO DEFROST pad.
DO THIS... THIS HAPPENS... POWER STAGE 1 2 DEFROST WEIGHT TIME AUTO START The STAGE2 indicator lights and “P-” is displayed. 6. Touch POWER pad. LOCK 8 NO STAGE 1 2 CUPS g DEFROST WEIGHT TIME AUTO START The display will show what you touched. 7. Touch the number pads for the power level you want in the second stage. LOCK 4 2 0 NO STAGE 1 2 CUPS g DEFROST WEIGHT TIME AUTO START 8. Touch the number pads for the cooking time you want in the second stage. LOCK START 9.
AUTO START Allows you to program cooking to start at a time you select. The food will automatically start cooking at the desired time. Program is able up to 2 stages (not acceptable DEFROST) DO THIS... THIS HAPPENS... 1. Program the desired power level and cooking time. CLOCK/ A.START STAGE 1 2 DEFROST WEIGHT TIME AUTO START The AUTO START indicator lights and “ :0” is displayed. 2. Touch CLOCK/A.START pad.
FEEDING BOTTLE Feeding Bottle is to use to sterillize feeding bottles. DO THIS... FEEDING BOTTLE THIS HAPPENS... STAGE 1 2 DEFROST WEIGHT TIME AUTO START 1. Touch FEEDING BOTTLE pad. LOCK NO CUPS When you touch Feeding Bottle pad, “2” is displayed. After 1.5 seconds, the display is changed into cooking time of quantity and the oven starts cooking. g *FEEDING BOTTLE* (The number of feeding bottle) ¡ 2 ea : Touch Feeding Bottle once. ¡ 4 ea : Touch Feeding Bottle once twice within 1.5 seconds.
ONE TOUCH COOKING One touch cook allows you to cook or reheat many of your favorite foods by touching just one pad. To increase quantity, touch chosen pad until number in display is same as desired quantity to cook. (except for MUFFIN & DINNER PLATE) DO THIS... FROZEN PIZZA THIS HAPPENS... STAGE 1 DEFROST WEIGHT TIME 2 AUTO START 1. Touch FROZEN PIZZA pad. LOCK 2. Touch FROZEN PIZZA pad one more.
* BEVERAGE* (250ml/cup) ¡ 1 cup (mug) : Touch BEVERAGE once. ¡ 2 cups (mugs) : Touch BEVERAGE twice within 1.5 seconds. ¡ 3 cups (mugs) : Touch BEVERAGE three tmes within1.5 seconds.
* SOUP* ¡ 250g : Touch SOUP once. ¡ 350g : Touch SOUP twice within1.5 seconds.
MORE, LESS MORE pad : adds for 10 seconds to 20 seconds. LESS pad : remove for 10 seconds to 20 seconds. These pad only work one touch cooking and feeding bottle mode. And always input previously CHILD SAFETY LOCK The safety lock prevents unwanted oven operation such as by small children. To set, press STOP/CLEAR for 3 seconds, LOCK indicator lights. To cancel, press STOP/CLEAR for 3 seconds, LOCK indicator goes off. TO STOP THE OVEN WHILE IT IS OPERATING 1. Press STOP/CLEAR pad.
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. If the door is not closed properly, the oven will not operate. When the door is closed, the hook pushes the lever downward.
(2) Monitor interlock switch When the door is closed, the hook pushes the lever forward, and pushes the Latch Lever downward the lever press the button of the interlock monitor switch to bring it under ‘OFF’ condition. The latch Lever press the button on the secondary interlock switch to bring it under ‘ON’ condition. - Adjustment Interlock monitor switch When the door is closed, the monitor switch should be opened before other switches close.
PRECAUTIONS FOR DISASSEMBLY AND REPAIR - 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.
DISASSEMBLY AND ASSEMBLY 1. To remove cabinet. (Refer to Fig. 1) 1) Remove four screws on cabinet back. 2) Push the cabinet backward. Fig. 1 2. To remove guide wind assembly. (Refer to Fig. 2) 1) Remove the screw ¤ , guide wind ¤Œ. 2) Pull the fan ¤Øto the motor shaft. 3) Release two screws ¤ which secure the motor shaded pole ¤º. 4) Reverse the above steps for reassembly. 6 7 5 3 4 Fig.
3. To remove H.V. transformer. (Refer to Fig. 3) 2 1) Remove four screws ¤ which secure the H.V. Transformer bracket to the base plate. 2) Remove the H.V. Transformer ¤Ł . 1 Fig. 3 High voltage circuit wiring H.V. Capacitor H.V. Diode Magnetron H.V.
4. To remove magnetron. (Refer to Fig. 4) 1) Remove three screws ¤Ł which secure the magnetron ¤ . 2) Remove the magnetron. 3) Reverse the above steps for reassembly. Fig.
5. To remove control panel assembly. (Refer to Fig. 5, 6) (1) Remove a screw holding control panel assembly to the oven front plate. At the same time, draw forward the control panel assembly from oven front plate. (2) Remove three screws ¤ which secure the PCB main assembly ¤º to control panel ¤ . (3) Disconnect membrane tail from the connector of the PCB main assembly. (4) Detach membrane ¤Œ from the control panel. Fig. 5 Fig. 6 REF NO.
6. To remove door assembly. (Refer to Fig. 7) 1 1) Remove two screws which secure to hinge. 2 2) Remove door assembly ¤Ł. 3) Remove door above for reassembly taking case to replace fixing glue. 7. To remove door part. (Refer to Fig. 8) (1) Remove the frame door ¤ and barrier-screen ¤º. (2) Remove the Absorber micro ¤ . (3) Pull the hook ¤Ø. Fig. 7 (4) Remove the spring ¤Œ. Fig. 8 REF NO.
8. Method to reduce the gap between the door seal and the oven front surface. (1) To reduce gap located on part ‘A’. 1) Remove the cabinet. 2) Loosen a screw on top door hinge, then push the door to contact the door seal to oven front surface. 3) Tighten a screw. A D B C (2) To reduce gap located on part ‘B’. 1) Loosen a screw on bottom hinge, then push the door to contact the door seal to oven front surface. 2) Tighten a screw. (3) To reduce gap located on part ‘C’. 1) Remove the cabinet.
9. To remove tray motor and under Heater. (Refer to Fig. 9) 1) Cut the tray motor cover parts from the base plate (Refer to Fig. 9). 2) Remove two screws ¤Łwhich secure the tray motor ¤ . 1 2 CUTTING(8EA) Fig.
TROUBLE SHOOTING GUIDE Following the procedures below to check if the oven is defective or not. 1. 2. 3. 4. Check grounding before checking trouble. Be careful of the high voltage circuit. Discharge the high voltage capacitor. When checking the continuity of switches or of the high voltage transformer, disconnect one lead wire from these parts and then check continuity with the AC plug removed. To do otherwise may result in false reading or damage to your meter. 5.
(TROUBLE 2) Digital readout display does not show programming, even if the membrane keyboard is programmed by touching proper pads. Condition Check Result Cause Remedy Display does not show programming at all, even if keyboard is touched. Check each pad for continuity of the membrane keyboard for the following keyboard check procedure. Normal Malfunction of touch control circuitry of control box sub-assembly. Replace control box subassembly. Abnormal Malfunction of the membrane keyboard.
2. Type of encoding and pad names. (KOR-971M) 5 E 4 D C3 2 B 1 A 9 8 7 6 5 4 3 2 1 0 F6 G7 H8 I9 START DINNER PLATE POWER FROZEN BEVERAGE MUFFIN PIZZA SPEEDY COOK LESS FEEDING BOTTLE MORE J 10 K 11 STOP/ CLEAR CLOCK/ AUTO A.START DEFROST WEIGHT MENU Fig. 11 Key Matrix The membrane keyboard consists of 25 keys whose configurations are described above and provide 11 pad terminations to be connected to the touch control circuit as Fig. 11.
(KOR-971Q) 5 E 4D 3 C 2 B 1 A 9 8 7 6 5 4 3 2 1 0 BAKED POTATO DINNER PLATE SOUP POWER MUFFIN SPEEDY COOK N.C FEEDING BOTTLE N.C N.C F6 7 G H 8 N.C I 9 START FRESH VEGETABLE FROZEN BEVERAGE PIZZA LESS MORE J 10 K 11 STOP/ CLEAR CLOCK/ AUTO A.START DEFROST Fig. 11 Key Matrix The membrane keyboard consists of 26 keys whose configurations are described above and provide 11 pad terminations to be connected to the touch control circuit as Fig. 11.
(TROUBLE 3) Condition 20A fuse blows Oven does not operate at all; Display window does not display any figures and any inputs can not be accepted. Check Result Casue Remedy Check continuity Interlock Monitor switch with door closed. Continuity Malfunction of Interlock monitor switch Replace Primary Interlock Switch and Monitor Interlock Switch.
Condition Check Result Cause Outlet has proper voltage. Fuse does not open. Check continuity of magnetron thermostat No Continuity Defective mangetron thermostat. Replace Check continuity of power supply cord. No Continuity Open power supply cord. Replace Normal Defective P.W.B. ASSY Replace Malfunction of D.O.M switch Replace Display do not shown countdown (TROUBLE 4) Condition Turntable motor fan motor and oven lamp do not turn on.
(TROUBLE 5) Condition No microwave oscillation No microwave oscillation even though fan motor rotates.
(TROUBLE 6) Microwave Output power is low. First of all, check if output power is really low following “measurement of the microwave output power”. Condition Check Result Cause Output power is low.
MEASUREMENT @@@@@@@@e? @@@@@@@@e?@@@@@@@@?e@@@@@@@@e?@@@@@@@@?e@@@@@@@@e?@@@@@@@@?e@@@@@@@@e?@@@@@@@@?e@@@@@@@@e?@@@@@@@@?e@@@@@@@@e?@@@@@@@@?e@@@@@@@@e?@@@@@@@@?e@@@@@@@@e?@@@@@@@@?e@@@@@@@@e?@@@@@@@@?e@@@@@@@@e?@@@@@@@@?e @@@@@@@@e? @@@@@@@@e?@@@@@@@@?e@@@@@@@@e?@@@@@@@@?e@@@@@@@@e?@@@@@@@@?e@@@@@@@@e?@@@@@@@@?e@@@@@@@@e?@@@@@@@@?e@@@@@@@@e?@@@@@@@@?e@@@@@@@@e?@@@@@@@@?e@@@@@@@@e?@@@@@@@@?e@@@@@@@@e?@@@@@@@@?e@@@@@@@@e?@@@@@@@@?e@@@@@@@@ @@@@@@@@ @@h? @@ @@h? @@ @@h? @@ @@h? @@ @@h? @@ @@h? @@ 1.
2-2. Judgement The value of resistance should be applied to the value specified below. Door Open Closed Primary Interlock Switch 0 Secondary Interlock Switch 0 Interlock Monitor Circuit 0 3. Microwave Leakage Test 3-1. Warning 1) DO NOT place your hands into any suspected microwave leakage field unless the safe density level is known. 2) Always start measuring of an unknown field to assure safety for operating personnel from microwave energy.
COMPONENT TEST PROCEDURE 1. High voltage is present at the high voltage terminal of the high voltage transformer during any cook 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 36). 1. High voltage transformer 4. Magnetron (A) Remove connections from the transformer terminals and check continuity.
WIRING DIAGRAM 55
EXPLODED VIEWS AND PARTS LIST 56
NO PART NAME DESCRIPTION PART CODE Q’TY 1 CAVITY WELD AS KOR-971M0S 3516107940 1 2 DOOR AS KOR-971M0S 3511708360 1 3 CONTROL-PANEL AS KOR-971M0A PKCPSWMX00 KOR-971Q0A PKCPSWM600 4 COVER WAVE GUIDE MICA T0.5 3511403800 5 SCREW TAPPING T1 BIN 4X8 MFNI 7113400814 1 6 COUPLER PPS 3517400600 1 7 MOTOR SYNCRO 220V 2.5W GM-16-24FD12 3966310100 1 8 SCREW TAPPING T2S PAN 4X10 MFZN 7121400611 1 1 1 9 BASE SBHG T0.
PRINTED CIRCUIT BOARD 1. CIRCUIT CHECK PROCEDURE 1) Low Voltage Transformer (DMR-604P) Check. The low voltage transformer is located on the P.C.B. Measuring condition : Input voltage ; 120V Measuring condition : Frequency ; 60Hz 1 10 Voltage Terminal 6 - 17 8 - 10 8 7 LOAD NO LOAD 24V 2.4V 30V 2.
3) Display problems NO. CAUSE MEASUREMENT 1 Poor contact between P.C.B. and display filament. Check the voltage of PIN 1 & PIN 25. 2 Defective Display Refer to “The display trouble shooting data” below. 3 Loss of vacuum in the display RESULT REMEDY 2.4 VAC Fix the PIN 1 & 25 on the P.C.B. Replace P.C.B. assembly. white spot White spot is generated on the display. Replace P.C.B assembly. DISPLAY TOUBLE SHOOTING DATA DISPLAY NAME & PIN NO. MICOM OUTPUT IN PIN NO.
CHECK METHOD POINT A STAGE RELAY “2” ON -24VDC RELAY “2” OFF GND (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. RY1 A IC1 Q3 L R10 D9 18 B R -24V CHECK METHOD POINT A B RELAY “1” ON -5VDC GND RELAY “1” OFF GND GND STAGE 5) When the door is opened during operation, the Count down time does not stop.
6) When the digital clock does not operate properly. D11 D14 D12 D13 IC1 22 R17 R11 C4 A POINT A WAVEFORM 0V -14V TT ;; 16.67 16.67ms ms If clock does not keep exact time, you must check resistor R11, R17.
62 YW396-05VA CN3 2 1 LVT1 DMR-604FS LVIT1 10 8 7 6 F2 F1 D13 D14 20B 1/2W ZD3 1.2K 1/2W R21 D12 V1 : -5V V2 : -24V 3.9V 1/2W 470µF 50V EC5 56 1/2W R22 1K R20 BM-20K R4 1K 200 ZD1 R3 47K R17 150 1/2W R24 1K A1270Y Q1 R2 1K 150 1/2W R23 150 1/2W R19 2.2µF 50V EC4 R15 V1 1K R9 4.
63 CN3 YW396-05VA 2 1 LVT1 DMR-604FS LVIT1 10 8 7 6 F2 F1 D13 D14 20B 1/2W ZD3 1.2K 1/2W R21 D12 V1 : -5V V2 : -24V 3.9V 1/2W 470µF 50V EC5 56 1/2W R22 1K R20 BM-20K R4 1K 200 ZD1 R3 47K R17 150 1/2W R24 A1270Y Q1 R2 1K 150 1/2W R23 150 1/2W R19 2.2µF 50V 971MOS SJ1 INSERTION SJ2 REMOVAL SJ3 INSERTION LVT1 DMR-604FS V1 56 1/2W R25 V2 V2 1K EC4 R15 V1 1K R9 4.
COMPONENT INFORMATION 1) Transistor Q 1, 3-5 Emitter Collector Base 2) Diode and Zener Diode DIODE CATHODE (K) ANODE (A) D1-7, 9-14 ZENER DIODE CATHODE (K) ANODE (A) ZD 1-3 64
4.
5. P.C.B LOCATION NO. No NAME SYMBOL SPECIFICATION PART CODE ¡TY fl Q¡ 1 RESISTOR R10, 12, 13, 18 4.
