S/M No. : C924T0S004 Service Manual Microwave Oven Model: KOC-924T0S/925T9S KOC-924T5S/925T5S KOC-924T0S01/925T9S01 KOC-924T5S01/925T5S01 ✔ 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. http : //svc.dwe.co.kr May.
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-924T0S/924T0S01/925T9S/925T9S01 POWER SUPPLY MICROWAVE 230V~50HZ, SINGLE PHASE WITH EARTHING 1500W POWER GRILL 1150W CONSUMPTION CONVECTION 2550W COMBINATION 3000W 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. 20kg (44.1 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 1 1 2 7 KOC-924T 3 MW 2 Grill Combi Weight 7 KOC-924T Defrost Time 8 Defrost 3 MW Grill 4 Autocook Lock Combi Weight Time 8 g 10 9 4 Autocook Lock Convection g 9 10 5 6 Convection Barbecue 5 Auto cook menu 1. Roast pork 2. Roast beef 3. Roast chicken 4. Baked fish 5. Fresh vegetable 6 Auto cook 11 Combi 22 Auto cook menu 1. Roast pork 2. Roast beef 3. Roast chicken 4. Baked fish 5.
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.
1. To remove cabinet 1) Remove four 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 assemby. NOTE: After replacing the door assembly, perform a check of correct alignment with the hinge and cavity front plate.
✔ 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) 3. To remove door parts. A10 A09 A08 A07 A11 A12 A04 A05 A06 A03 A13 A02 A01 REF NO. PART CODE PART NAME DESCRIPTION A01 3512603620 HANDLE DOOR S455C 1 A02 3511608300 DECORATOR DOOR*R SUS430 T0.
(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. 1) KOC-924T0S/924T5S/924T0S01/924T5S01 B01 B02 B03 B04 B05 B06 B11 PART NAME B10 B09 B08 B07 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) 2) KOC-925T9S/925T5S/925T9S01/925T5S01 REF NO. PART CODE PART NAME DESCRIPTION Q’TY B01 3513406310 KNOB VOLUME ABS SG-175 SG-0760D B02 3515501820 WINDOW DISPLAY PMMA 1 B03 3511608110 DECORATOR C-PANEL SUS430 T0.
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 Top heater assembly parts. 5 6 7 1 2 8 3 4 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 Rear heater assembly parts. 14 13 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 Barbecue motor syncro and Guide rotary part. 1 2 3 4 5 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) The following visual conditions inditions indicate a probable defective touch control Circuit or button P.C.B. assembly 1. Incomplete segments. 1) segment missing 2) partial segments missing 3) digit flickering other than normal fluorescent slight flickering 2. A distinct change in the brightness of one or more numbers exists in the display 3. One or more digits in the display are not on when they should be. 4. Display does not count down or up with time cooking or clock operation. 5.
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. 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 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.
N L GE BL BR POWER SUPPLY : SINGLE PHASE ONLY N L 29 GN N L WH RD RD FAN RELAY BR FM RD MOTOR RELAY YW OL RD NOTE : OL : OVEN LAMP FM : FAN MOTOR CM : CONVECTION FAN MOTOR TTM : TURNTABLE MOTOR L.V.
- KOC-924T0S01/924T5S01/925T9S01/925T5S01 30
F01 F02 F03 F04 F72 31 A00 F05 F08 F68 B00 F71 F06 F66 F09 F63 F62 F73 F67 F07 F10 F74 F61 F65 F69 F11 F60 F64 F50 F59 F49 F70 F12 F51 F45 F13 F44 F14 F58 F55 F52 F53 F20 F16 F57 F54 F48 F47 F19 F43 F46 F18 F17 F15 F56 F40 F21 F23 F42 F41 F22 F26 F39 F38 F25 F24 F27 F37 F35 F34 F36 F33 F32 F31 F30 F28 F29 11. EXPLODED VIEW AND PARTS LIST 1. DOOR ASSEMBLY Refer to 6. Disassembly and assembly. 2. CONTROL PANEL ASSEMBLY Refer to 6.
✔ 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 F35 3963514300 MOTOR SHADED POLE 230V 50HZ MW10CA-T02 1 F36 3513303400 INSULATOR HEATER*B SBHG-1 T0.5 1 F37 3511409800 COVER HEATER*B SA1D-80 T0.5 1 F38 3511800700 FAN CONVECTION SA1D-80 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: 230V / Frequency: 50Hz Terminal Voltage(load) 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. B A 16 D8 M/W RY1 Q4 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 top grill When touching GRILL or 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. B A 17 D9 TOP GRILL RY2 Q5 STATE POINT A POINT B RELAY 2 ON +5V DC GND RELAY 2 OFF GND +24V DC 5. Case of no heating of convection grill When touching CONVECTION button, oven lamp turns on and Fan motor and turntable rotate and cook indicator in display comes on.
6. Case of no stopping of the count down timer When the door is opened during operation, the count down timer does not stop. A B R2 1 CN1 2 3 D6 C1 D.O.M SW R3 C2 +5V 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. 37 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 CORP. 686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX: DWELEC K28177-8 CABLE: “DAEWOOELEC” S/M No. : C924T0S004 PRINTED DATE: May.
