DAEWOO ELECTRONICS KOC-995T0S Service Manual
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DAEWOO ELECTRONICS KOC-995T0S Service Manual

DAEWOO ELECTRONICS KOC-995T0S Service Manual

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S/M No. : C995T0S110
Service Manual
Microwave Oven
Model: KOC-995T0S
KOC-995T0S11
DAEWOO ELECTRONICS CO., LTD.

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Summary of Contents for DAEWOO ELECTRONICS KOC-995T0S

  • Page 1 S/M No. : C995T0S110 Service Manual Microwave Oven Model: KOC-995T0S KOC-995T0S11 DAEWOO ELECTRONICS CO., LTD.

  • Page 2: Table Of Contents

    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. (b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make repairs as necessary: (1) Interlock operation, (2) Proper door closing, (3) Seal and sealing surfaces (arcing, wear, and other damage), (4) Damage to or loosening of hinges and latches, (5) Evidence of dropping or abuse.

  • Page 3: Safety And Precautions

    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.

  • Page 4: Specifications

    SPECIFICATIONS MODEL KOC-995T0S KOC-995T0S11 POWER SUPPLY 230V~50Hz 230V~50Hz MICROWAVE 1,550W 1,550W GRILL 1,400W 1,400W POWER CONSUMPTION CONVECTION 1,450W ( Temporary Maximum Power Consumption : 2,800W ) COMBINATION 2,950W (Simultaneous) 1,550W (Sequentional) MICROWAVE ENERGY OUTPUT 1,000W(IEC705) 1,000W(IEC705) MICROWAVE FREQUENCY 2,450MHz 2,450MHz OUTSIDE DIMENSIONS (W X H X D) 526 x 345 x 496 mm (20.7 x 13.6 x 19.1 in.)

  • Page 5: External View

    EXTERNAL VIEW 1. OUTER DIMENSION...

  • Page 6: Feature Diagram

    EXTERNAL VIEW 2. FEATURE DIAGRAM 2-1. KOC-995T0S 1. Door seal - Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage. 2. Door hook When the door is closed, it will automatically shut. If the door is opened while the oven is operating, the magnetron will immediately stop operating.
  • Page 7 EXTERNAL VIEW 2-2. KOC-995T0S11 1. Door seal - Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage. 2. Door hook - When the door is closed, it will automatically shut. If the door is opened while the oven is operating, the magnetron will immediately stop operating.

  • Page 8: Installation

    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.

  • Page 9: Control Panel

    CONTROL PANEL 1. KOC-995T0S...
  • Page 10 CONTROL PANEL 2. KOC-995T0S11...

  • Page 11: Disassembly And Assembly

    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 safety 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.
  • Page 12 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 for earthing and for fixing to rear-plate. 2) Remove the noise filter from the guide wind. 3) Pull the fan from the motor shaft.
  • Page 13 DISASSEMBLY AND ASSEMBLY 3. To remove H.V.transformer (1) Remove four screws which secure the H.V.transformer to the base plate. (2) Remove the H.V.transformer. (3) Reverse the above steps for reassembly. 4. To remove high voltage capacitor (1) Remove a screw which secure the grounding ring terminal of the H.V.
  • Page 14 DISASSEMBLY AND ASSEMBLY 5. To temove guide air assembly 1) Remove two screws holding guide air assembly to the oven cavity. 2) Remove a screw which secure the lamp to guide air assembly. 3) Remove lever damper to valve damper. 4) Remove a screw which secure the solenoid to guide air assembly.
  • Page 15 DISASSEMBLY AND ASSEMBLY 6. To remove convection part 1) Remove four screws holding guide air assembly to the oven cavity. 2) Remove a special screw to convection part. 3) Remove the fan convection. 4) Remove the pipe. 5) Remove three screws which hold the heater to convection part.
  • Page 16 7. To remove magnetron 1) Remove three screws which secure the magnetron. 2) Remove the magnetron. 3) Reverse the above steps for reassembly. WARNING Never install the magnetron without the metallic gasket plate which is packed with each magnetron to prevent microwave leakage. Whenever repair work is carried out on magnetron, check the microwave leakage.
  • Page 17 ABS XR-401 COATING 3516907200 BUTTON FUNCTION ABS XR-401 COATING 3516906320 BUTTON FUNCTION ABS XR-401 COATING 3514321800 PCB SUB AS KOC-995T0S 7621301011 SCREW TAPPING T2S PAN 3x10 PW MFZN 3514312810 PCB MAIN AS KOC-995T0S 3514320330 PCB MAIN AS KOC-995T0S11 7122401211 SCREW TAPPING...
  • Page 18 FRAME DOOR 3511603200 DECORATOR DOOR *T STS304 T0.6 H/L 3511603300 DECORATOR DOOR *U STS304 T0.6 H/L 3515203610 STOPPER HINGE *T AS KOC-995T0S 3512602410 HANDLE DOOR *T AS ABS XR-401 SILVER KOC-985T 3512602300 HANDLE DOOR *U ABS XR-401 7121300811 SCREW TAPPING...
  • Page 19 DISASSEMBLY AND ASSEMBLY 11. 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. •...
  • Page 20 13. To remove tray motor 1) Cut the tray motor cover parts from the base plate. 2) Remove two screws which secure the tray motor. 14. To remove grill heater assembly 1) Release two hex nuts holding the Grill Heater Assembly to top and side plate. 2) Remove Grill Heater Assembly.

  • Page 21: Interlock Mechanism And Adjustment

    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.

  • Page 22: Trouble Shooting Guide

    TROUBLE SHOOTING GUIDE Following the procedures below to check if the oven is defective or not. 1. Check grounding before checking trouble. 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 then check continuity with the AC plug removed.
  • Page 23 TROUBLE SHOOTING GUIDE CONDITION CHECK RESULT CAUSE REMEDY Replace Check continuity of Defective Outlet has magnetron Continuity magnetron proper voltage Fuse does not blow. Replace Defective Check continuity of noise Continuity noise filter board filter board Adjust Check continuity of Open power power supply cord Continuity...
  • Page 24 TROUBLE SHOOTING GUIDE (TROUBLE 3) No microwave oscillation even though fan motor rotates. CONDITION CHECK RESULT CAUSE REMEDY No microwave Check continuity of high oscillation Continuity voltage fuse Replace high voltage fuse Replace Continuity Defective Check continuity of high high voltage voltage capacitor transformer terminals with wires...
  • Page 25 TROUBLE SHOOTING GUIDE (TROUBLE 4) Display shows all figures selected, but oven does not start cooking, even though desired program and time are set and start pad is tapped. CONDITION CHECK RESULT CAUSE REMEDY Adjust or Check continuity of Malfunction 1) Turn table Continuity replace...
  • Page 26 TROUBLE SHOOTING GUIDE (TROUBLE 6) The following visual conditions indicate a probable defective touch control circuit or button P.C.B. assembly. 1. Incomplete segments (1) Segments missing (2) Partial segments missing (3) Digit flickering other than normal fluorescent slight flickering (4) 0 does not display when power is on. 2.
  • Page 27 To determine if the tact switch keyboard is defective or not, check the continuity of each button(key) contacts with a multimeter. 1) PROGRAM COOK button : between 4 and 15 2) TIME DEFROST button : between 8 and 14 (KOC-995T0S) / DEFROST button : between 8 and 14 (KOC-995T0S11) 3) COMBI button : between 6 and 15...

  • Page 28: Measurement And Test

    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 wit the microwave oven supplied at rated voltage and operated at its maximum microwave power setting with a load of 1000 ±...

  • Page 29: Electrical Continuity Check Of Interlock Switch

    MEASUREMENT AND TEST 2. ELECTRICAL CONTINUITY CHECK OF INTERLOCK SWITCH NOTE Remove the power plug from the wall receptacle before testing. PROCEDURE 1. Primary interlock switch (1) Disconnect two connectors from primary interlock switch. (2) Connect the ohm-meter leads between the terminals of the primary interlock switch. 2.

  • Page 30: Microwave Radiation Test

    MEASUREMENT AND TEST 3. MICROWAVE RADIATION TEST WARNING Make sure to check the microwave leakage before and after repair of adjustment. Always start measuring of an unknown field to assure safety for operating personnel from microwave energy. Do not place your hands into any suspected microwave radiation field unless the safe density level is known. Care should be taken not to place the eyes in direct line with the source of microwave energy.

  • Page 31: Component Test Procedure

    MEASUREMENT AND TEST 4. 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. •...

  • Page 32: Wiring Diagram

    WIRING DIAGRAM...

  • Page 33: Schematic Diagram

    SCHEMATIC DIAGRAM...
  • Page 34 SCHEMATIC DIAGRAM...
  • Page 35 SCHEMATIC DIAGRAM...

  • Page 36: Exploded View And Parts List

    EXPLODED VIEW AND PARTS LIST 1. KOC-995T0S 1) EXPLODED VIEW...
  • Page 37 EXPLODED VIEW AND PARTS LIST 2) PARTS LIST REF NO. PART CODE PARE NAME DESCRIPTION 3511712000 DOOR ASSY KOC-995T0S 3516715310 CONTROL PANEL ASSY KOC-995T0S 3515200810 STOPPER Hinge *T P/O T 2.6 7272400811 SCREW TAPTITE TT3 TRS 4×8 MFZN 5EPV048355 TRANS POWER...
  • Page 38 EXPLODED VIEW AND PARTS LIST REF NO. PART CODE PARE NAME DESCRIPTION 3517501000 PROTECTOR DAMPER SILICON RUBBER 3518116200 H.V. TRANSFORMER JY-N 10S0-96T 3518701400 FUSE H.V. HV41A70 03 3518302300 CAPACITOR H.V. 2100V AC 1.1MICRO F 441X304112 HOLDER H.V. CAPACITOR SECC 0.8T 7272400811 SCREW TAPTITE TT3 TRS 4×8 MFZN...
  • Page 39 EXPLODED VIEW AND PARTS LIST 2. KOC-995T0S11 1) EXPLODED VIEW...
  • Page 40 EXPLODED VIEW AND PARTS LIST 2) PARTS LIST REF NO. PART CODE PARE NAME DESCRIPTION 3511712000 DOOR ASSY KOC-995T0S 3516715310 CONTROL PANEL ASSY KOC-995T0S 3515200810 STOPPER Hinge *T P/O T 2.6 7272400811 SCREW TAPTITE TT3 TRS 4×8 MFZN 5EPV048355 TRANS POWER...
  • Page 41 EXPLODED VIEW AND PARTS LIST REF NO. PART CODE PARE NAME DESCRIPTION 3518302300 CAPACITOR H.V. 2100V AC 1.1MICRO F 441X304112 HOLDER H.V. CAPACITOR SECC 0.8T 7272400811 SCREW TAPTITE TT3 TRS 4×8 MFZN 3518400400 DIODE H.V. HVR-1×3AB 7121400811 SCREW TAPTITE T2S PAN 4×8 MFZN 3513813500 LOCK POM BLACK...

  • Page 42: Printed Wiring Board

    PRINTED WIRING BOARD 1. CIRCUIT CHECK PROCEDURE 1. Low Voltage Transformer check 1) The low voltage transformer is located on the Base. 2) Measuring condition (input voltage) : 230 VAC / 50 Hz KOC-995T 0S/KOC-995T0S11 LVT : DMR-881FS1 Terminal Voltage 230VAC/50Hz 6 - 7 14.0 VAC...
  • Page 43 PRINTED WIRING BOARD NOTE The marks of the above corresponding voltages (+5, +12, -24VDC) are written on the PCB . Each measuring points must be measured with GND points. 3. Display Problems CAUSE MEASUREMENT RESULT REMEDY Poor contact between Fix the pin 1 & Check the voltage of display pin 1 &...
  • Page 44 PRINTED WIRING BOARD · Check method STAGE POINT A POINT B RELAY ON +5 VDC RELAY OFF +12 VDC 2) Situation : When touching M/W button, oven lamp does not turn on, turntable motor and fan moter does not rotate but cook indicator in the display comes on.
  • Page 45 PRINTED WIRING BOARD 6. Case of no heating of back heater - When touching TEMP & COMBI button, oven lamp turns on, fan motor and turntable motor rotate and cook indicator in the display comes on without heating. ⇒CAUSE : Relay 3 (RY3) does not operate. KOC-995T 0S/KOC-995T0S11 ·...
  • Page 46 +5 VDC Door closed Closed 9. Case of appearring Err6 on the display KOC-995T 0S/KOC-995T0S11 · Check method POINT WAVEFORM T : 20ms (50Hz) NOTE If clock does not keep exact time, you must check Diode D2 & Transistor Q2 (KOC-995T0S/995T2S),...

  • Page 47: Circuit Diagram

    P.C.B. CIRCUIT DIAGRAM 1. PCB CIRCUIT DIAGRAM...
  • Page 48 P.C.B. CIRCUIT DIAGRAM 2. PCB ASSY PART LIST 1. KOC-995T0S NAME SYMBOL SPECIFCATION PART CODE Q′TY M220 93X197 3514317110 M221 91.5X197 3514317210 BUZZER BM-20K 3515600100 CONNECTOR WAFER 515 80-15 4CW215SBD0 CONNECTOR WAFER YW396-02V 3519150520 CONNECTOR WAFER 5267-04A 4076122040 CONNECTOR WAFER...
  • Page 49 P.C.B. CIRCUIT DIAGRAM NAME SYMBOL SPECIFCATION PART CODE Q′TY R CABON FILM 1/6W, 1M OHM J RD-AZ105J- R CABON FILM R14,R16~R18,R30~R32 1/6W, 4.7K OHM J RD-AZ472J- R CABON FILM 1/6W, 510 OHM J RD-AZ511J- R CABON FILM R21~R23 1/2W, 6.8 OHM J S RD-2Z689J- R CABON FILM 1/6W, 1.2K OHM J...
  • Page 50 P.C.B. CIRCUIT DIAGRAM 2. KOC-995T0S11 NAME SYMBOL SPECIFCATION PART CODE Q′TY M220 93X197 3514317110 M221 91.5X197 3514317210 BUZZER BM-20K 3515600100 CONNECTOR WAFER 515 80-15 4CW215SBD0 CONNECTOR WAFER YW396-02V 3519150520 CONNECTOR WAFER 5267-04A 4076122040 CONNECTOR WAFER YW025-05 4076131050 CONNECTOR WAFER CN101 515 81-15 4CW215RBD0 DIGITRON...
  • Page 51 P.C.B. CIRCUIT DIAGRAM NAME SYMBOL SPECIFCATION PART CODE Q′TY R CABON FILM R14,R16~R18,R30~R32 1/6W, 4.7K OHM J RD-AZ472J- R CABON FILM 1/6W, 510 OHM J RD-AZ511J- R CABON FILM R21~R23 1/2W, 6.8 OHM J S RD-2Z689J- R CABON FILM 1/6W, 1.2K OHM J RD-AZ122J- R CABON FILM 1/4W, 100 OHM J...
  • Page 52 DAEWOO ELECTRONICS CO., LTD 686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX : DWELEC K28177-8 CABLE : “ DAEWOOELEC” E-mail : G7F00E@web.dwe.co.kr FAX : 032) 510-7630 TEL : 032) 510-7618 PRINTED DATE : OCT. 1999...

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