S/M No. : C910K0S001 Service Manual Microwave Oven Model: KOC-910K0S KOC-911K0S ✔ 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 CO., LTD. http://svc.dwe.co.kr Dec.
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.
1. 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.
2. SPECIFICATIONS MODEL KOC-910K0S POWER SUPPLY MICROWAVE 230V~50HZ, SINGLE PHASE WITH EARTHING 1500W POWER GRILL 1600W CONSUMPTION COMBECTION 2300W COMBINATION 3100W MICROWAVE ENERGY OUTPUT 1000W(IEC705) MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 542X329X515mm (21.3X13.0X20.3 in.) CAVITY DIMENSIONS (W X H X D) 350X230X355mm (13.8X9.1X14.0 in.) NET WEIGHT APPROX. 21kg (46.3 lbs.
3. EXTERNAL VIEW 1.
2. FEATURE DIAGRAM 11.DOOR HOOK When the door is closed, it will automatically lock shut. If door is opened while oven is operating, the magnetron will immediately stop operating. 12.DOOR VIEWING SCREEN Allows viewing of food. The screen is designed so that light can pass through, but not the microwave. 13.METAL RACK 14.TOP HEATER Turns on when convection, grill and combi cooking is selected. 15.OVEN LAMP Automatically turns on during oven operating. 16.SAFETY INTERLOCK SYSTEM 17.CONTROL PANEL 18.
4. 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.
5. CONTROL PANEL - KOC-910K DISPLAY WINDOW 11. LANGUAGE - press to select the language. 12. CRUSTY - Press to select crusty menu. 1. MICROWAVE - indicator, showing microwaving in progress. 13. CAKE - Press to select cake menu. 2. DEFROST- indicator, showing defrosting in progress. 14. MEMORY - Use to set favorite cooking mode. 3. GRILL(upper grill heater) - indicator, showing griling in progress. 15. AUTO COOK - Press to select auto cook menu. 4.
- KOC-911K DISPLAY WINDOW 11. LANGUAGE - press to select the language. 12. CRUSTY - Press to select crusty menu. 1. MICROWAVE - indicator, showing microwaving in progress. 13. CAKE - Press to select cake menu. 2. DEFROST- indicator, showing defrosting in progress. 14. MEMORY - Use to set favorite cooking mode. 3. GRILL(upper grill heater) - indicator, showing griling in progress. 15. AUTO COOK - Press to select auto cook menu. 4. GRILL(lower grill heater) - indicator, showing griling in progress.
6. 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.
✔ Caution: In this Service 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) 1. To remove cabinet 1) Remove four screws on cabinet back. 2) Push the cabinet backward. 2. To remove guide wind assembly 1) Remove two screws which secure the stopper hinge top. 2) Remove the door assembly from top plate of cavity.
✔ Caution: In this Service 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) KOC-910K REF NO. PART CODE PART NAME DESCRIPTION A01 3512603610 HANDLE DOOR PC 1 A02 3512204810 FRAME DOOR PC 1 A03 3517117100 BARRIER-SCREEN*O TEMP GLASS T3.
(1) Remove the gasket door from door plate. (2) Remove screws from door plate. (3) Remove the door frame from door plate. (4) Remove the stopper hinge top from door plate. (5) Remove the spring and the hook. (6) Remove the handle door and barrier screen outer from door frame. (7) Reverse 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’.
✔ Caution: In this Service 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) 5. To remove control panel parts. KOC-910K REF NO.
✔ Caution: In this Service 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) KOC-911K REF NO.
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 for earthing. 2) Remove the noise filter from the wind guide. 3) Remove a 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 reasembly. 9. To remove H.V.transformer. 1) Remove four screws holding the H.V.transformer. 2) Remove the H.V.transformer.
✔ Caution: In this Service 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) 10. To remove Lamp assembly parts. 1 6 7 2 8 3 5 4 9 REF NO.
✔ Caution: In this Service 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) 11. To remove Top heater assembly parts. 5 6 7 1 2 3 4 8 REF NO.
✔ Caution: In this Service 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) 12. To remove Rear heater assembly parts. 1 2 17 18 16 14 15 13 12 3 4 5 11 10 9 8 REF NO.
✔ Caution: In this Service 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) 13. To remove Motor synchro. And Under heater assembly parts. 5 4 3 2 1 CUTTING (6EA) REF NO.
7. 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.
8. 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 CHECK RESULT CAUSE REMEDY Outlet has proper voltage fuse does not blow? Check continuity of magnetron No continuity Defective magnetron. Replace Check continuity of noise filter board No continuity Defective line filter board Replace Check continuity of power supply cord No continuity Open power supply cord Replace No continuity Defective touch control circuit Replace NOTE : All these switches must be replaced at the same time, please refer to (7.
TROUBLE 3) No microwave oscillation even though fan motor rotates.
(TROUBLE 4) Grill heater (upper heater) is not heated; food will not become hot. CONDITION Grill heater is not heated. CHECK RESULT CAUSE REMEDY Check continuity of primary interlock switch No continuity Malfunction of primary Interlock switch Adjust or replace Check continuity of secondary interlock switch No continuity Malfunction of secondary interlock switch Adjust or replace Check continuity of heater No continuity Defective heater Check D.
(TROUBLE 6) Lower heater is not heated; food will not become hot. CONDITION CHECK RESULT CAUSE REMEDY Lower heater Is not heated Check continuity of Primary interlock switch No continuity Malfunction of primary Interlock switch Adjust or Replace Check continuity of secondary interlock switch No continuity Malfunction of secondary interlock switch Adjust or replace Check continuity of heater No continuity Defective heater Check D.
(TROUBLE 8) When “ERROR 2 ERROR 3” come on display.
9. 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 WARNING 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 .
4.
10.
11. EXPLODED VIEW AND PARTS LIST 1. ODDR ASSEMBLY Refer to 6. Disassembly and assembly. 2. CONTROL PANEL ASSEMBLY Refer to 6. Disassembly and assembly. 3.
✔ Caution: In this Service 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.
✔ Caution: In this Service 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) NO PART CODE PART NAME DESCRIPTION F36 3512766800 HARNESS CONVECTION-A KOC-1B0K0S 1 F37 3511407700 COVER HEATER *B SA1D T0.5 1 F38 3513302900 INSULATOR HEATER *B SA1D T0.
✔ Caution: In this Service 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) NO PART CODE PART NAME DESCRIPTION F73 3517202611 TRAY RACK AS KOC-961C0S 117MM 1 F74 3517202601 TRAY RACK AS KOC-961C0S 27MM 1 F75 3517205200 TRAY METAL SPP T0.
- KOC-911K 37
✔ Caution: In this Service 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.
✔ Caution: In this Service 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) NO PART CODE PART NAME DESCRIPTION F36 3512766800 HARNESS CONVECTION-A KOC-1B0K0S 1 F37 3511407700 COVER HEATER *B SA1D T0.5 1 F38 3513302900 INSULATOR HEATER *B SA1D T0.
✔ Caution: In this Service 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) NO PART CODE PART NAME DESCRIPTION F73 3517202611 TRAY RACK AS KOC-961C0S 117MM 1 F74 3517202601 TRAY RACK AS KOC-961C0S 27MM 1 F75 3517205200 TRAY METAL SPP T0.
12. PRINTED CIRCUIT BOARD 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(olad) Voltage(no load) 6-7 AC 17.0 V AC 19.9 V 8-9 AC 1.3 V AC 1.6 V 9-10 AC 1.3 V AC 1.6 V NOTE 1. Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source voltage. 2.
3. Case of no microwave oscillation 1) When touching M/W button, oven lamp turns on and Fan motor and turntable rotate, and cook indicator in display comes on. *Cause: RELAY 1 does not operate. STATE POINT A POINT B RELAY 1 ON +5V DC GND RELAY 1 OFF GND +24V DC 2) When touching M/W button, oven lamp does not turn on and turntable motor does not rotate but cook indicator in display comes on. *Cause: RELAY 1 does not operate.
4. Case of no heating of upper grill When touching GRILL1 & COMBI button, oven lamp turns on and Fan motor and turntable rotate, and cook indicator in display comes on. *Cause: RELAY 2 does not operate. STATE POINT A POINT B RELAY 2 ON +5V DC GND RELAY 2 OFF GND +24V DC 5. Case of no heating of lower grill When touching GRILL2 & COMBI button, oven lamp turns on and Fan motor and turntable rotate and cook indicator in display comes on. *Cause: RELAY 7 does not operate.
7. Case of no stopping of the count down timer When the door is opened during operation, the count down timer does not stop. B A POINT A B DOOR OPEN OPEN +5V DC DOOR CLOSED CLOSE GND STATE CHECK NO 1 METHOD Check the stage(ON,OFF) of the door open monitor switch by resistance measurement. 44 REMEDY Replace door open monitor swith.
13. P.C.B.
✔ Caution: In this Service 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.
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) 360-8184 TEL: 02) 360-8183 http://www.dwe.daewoo.co.kr S/M NO.
