Daewoo KOC-1B4K0S Service Manual
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Daewoo KOC-1B4K0S Service Manual

Microwave oven
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S/M No. : OC1B4K0001
Service Manual

Microwave Oven

Model: KOC-1B4K0S
KOC-1B4K0S01
KOC-1B4K0S10
KOC-1B4K0S20
KOC-1B4K0S31
KOC-1B4K9SA1
KOC-1B4K5S
KOC-1B4K5S10
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
Dec. 2005

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Summary of Contents for Daewoo KOC-1B4K0S

  • Page 1: Microwave Oven

    S/M No. : OC1B4K0001 Service Manual Microwave Oven Model: KOC-1B4K0S KOC-1B4K0S01 KOC-1B4K0S10 KOC-1B4K0S20 KOC-1B4K0S31 KOC-1B4K9SA1 KOC-1B4K5S KOC-1B4K5S10 Caution : In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you...

  • 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

    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.

  • Page 4: Specifications

    2. SPECIFICATIONS KOC-1B4K0S,1B4K0S01,1B4K0S10, KOC-1B4K5S,1B4K5S10 MODEL 1B4K0S20,1B4K0S31,1B4K9SA1 220~230V~50Hz, SINGLE 220~240V~50Hz, SINGLE POWER SUPPLY PHASE WITH EARTHING PHASE WITH EARTHING MICROWAVE 1500W POWER GRILL 1600W CONSUMPTION CONVECTION 2300W COMBINATION 3100W 2300W MICROWAVE ENERGY OUTPUT 1000W(IEC705) MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 560X344X543mm (22.0X13.5X21.3 in.)

  • Page 5: Feature Diagram

    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.

  • Page 6: Installation

    • This appliance is supplied with cable of special type, which, if damaged, must be repaired with cable of same type. Such a cable can be purchased from DAEWOO and must be installed by a Qualified Person. 6. Examine the oven after unpacking for any damage such as: A misaligned door, broken door or a dent in cavity.

  • Page 7: Control Panel

    3. GRILL(upper grill heater) - indicator, showing griling in progress. 4. GRILL(lower grill heater) - indicator, showing griling in progress. 5. CONVECTION - indicator, showing convectioning in progress.(KOC-1B4K0S,1B4K0S10, 1B4K0S20,1B4K5S,1B4K5S10) indicator(KOC-1B4K0S01,1B4K0S31, BARBECUE - 1B4K9SA1) 6. CHILD LOCK - indicator. 7. % - percentage microwave power level indicator.

  • Page 8: Disassembly And Assembly

    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 safety during normal operation. However, carelessness in servicing the oven can result in an electric shock or possible danger from a short circuit.
  • Page 9 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.
  • Page 10 3. To remove door parts. REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK 3512603530 KOC-1B4K'S KOC-1B4K0S 3512604200 HANDLE DOOR BAUMATIC KOC-1B4K5S 3512604210 STEEL OMEGA 3512603540 KOC-1B4K9SA1 KOC-1B4K0S 3515307400 BAUMATIC SUPPORTER HANDLE KOC-1B4K5S 3515308200 STEEL OMEGA 3511605500 DECORATOR DOOR *U STS304 T0.5...
  • Page 11 (1) Remove the gasket door from door plate. (2) Remove a screw 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 two screws from door frame. (7) Remove the handle door and barrier screen outer from door frame.
  • Page 12 ABS SG-175 SG-0760D 3511605120 DECORATOR RING 3516908540 BUTTON FUNCTION-C ABS SG-175 SG-0760D 3514323130 SUB PCB ASS Y KOC-1B4K 7121301011 SCREW TAPPING T2S PAN 3X10 MFZN KOC-1B4K0S, PKMPMSAD00 KOC-1B4K0S 1B4K0S10, 1B4K0S20 MAIN PCB ASSY KOC-1B4K0S01, PKMPMSAD10 KOC-1B4K0S01 1B4K0S31, 1B4K9SA1 KOC-1B4K5S, PKMPMSAD20...
  • Page 13 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.
  • Page 14 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.
  • Page 15 10. To remove Lamp assembly parts. REF NO. PART CODE PART NAME DESCRIPTION Q TY REMARK 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 3512520500 GUIDE AIR OUTLET SA1D T0.5 3513303000 INSULATOR HEATER*T SECC T0.5 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 3511407800 COVER LAMP STS430 T0.5...
  • Page 16 11. To remove Top heater assembly parts. REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 3512520500 GUIDE AIR OUTLET SA1D T0.5 3513303000 INSULATOR HEATER*T SECC T0.5 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 3512767000 HARNESS HEATER KOC-1B0K0S...
  • Page 17 12. To remove Rear heater assembly parts. REF NO. PART CODE PART NAME DESCRIPTION Q TY REMARK 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 3511407300 COVER MOTOR*B SA1D-80 T0.5 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 3511407400 COVER*B SA1D-80 T0.5 3512766900 HARNESS CONVECTION-B KOC-1B0K0S...
  • Page 18 13. To remove Motor synchro. And Under heater assembly parts. CUTTING (6EA) REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 3511407500 COVER HEATER *U STS430 T0.5 3515304000 SUPPORTER HEATER *U STS430 T0.5 3512802000 HEATER *U 230V 400W R18374001...

  • Page 19: Interlock Mechanism And Adjustment

    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.

  • Page 20: Troubleshooting Guide

    8. TROUBLESHOOTING 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.
  • Page 21 CONDITION CHECK RESULT CAUSE REMEDY Defective Outlet has Check continuity of Replace continuity magnetron. proper magnetron voltage fuse does not blow? Defective line Check continuity of noise filter Replace continuity filter board board Open power Check continuity of Replace continuity power supply cord supply cord Defective touch...
  • Page 22 TROUBLE 3) No microwave oscillation even though fan motor rotates. CONDITION CHECK RESULT CAUSE REMEDY Check continuity of Replace Defective continuity high voltage fuse microwave high voltage oscillation fuse No microwave oscillation Continuity Check continuity of Defective high voltage capacitor terminals high voltage with wires removed transformer...
  • Page 23 (TROUBLE 4) Grill heater (upper heater) is not heated; food will not become hot. CONDITION CHECK RESULT CAUSE REMEDY Malfunction of Adjust or Check continuity of Grill heater is primary Interlock replace continuity primary interlock switch not heated. switch Adjust or Malfunction of Check continuity of replace...
  • Page 24 (TROUBLE 6) Lower heater is not heated; food will not become hot. CONDITION CHECK RESULT CAUSE REMEDY Malfunction of Adjust or Check continuity of Lower heater primary Interlock Replace continuity Primary interlock switch Is not heated switch Adjust or Check continuity of Malfunction of replace secondary interlock...
  • Page 25 (TROUBLE 8) When “ERROR 2 ERROR 3” come on display. CAUSE CONDITION CHECK RESULT REMEDY “ERROR 2 & 0Ω or infinite Replace Replace Check continuity of thermistor ERROR 3” (resistance of thermistor) come on display Approx 200k~300kΩ (room temperature) Defective Replace Check continuity of heater continuty...

  • Page 26: Mesurement And Test

    9. MEASUREMENT AND TEST 9-1. 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 ±...

  • Page 27: Microwave Radiation Test

    9-2. 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.

  • Page 28: Component Test Procedure

    9-3. 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.

  • Page 29: Component Action

    9-4. COMPONENT ACTION MAGNE- UPPER LOWER REAR CONVEC- COOKING MODE TRON ELEMENT ELEMENT ELEMENT TION FAN GRILL-1 GRILL-2 GRILL-3 COMBI-1 COMBI-2 MANUAL COMBI-3 MODE COMBI-4 COMBI-5 CONVECTION100~130 CONVECTION140~150 CONVECTION160~250 CAKE/BREAD TOUCH CRUSTY ROAST BEEF ROAST CHICKEN ROAST PORK BAKED FISH AUTO BAKED POTATO MODE...

  • Page 30: Wiring Diagram

    10. WIRING DIAGRAM KOC-1B4K0S, 1B4K0S10, 1B4K0S 20, 1B4K5S, 1B4K5S10...
  • Page 31 KOC-1B4K0S01, 1B4K0S31, 1B4K9SA1...

  • Page 32: Exploded View And Parts List

    11. EXPLODED VIEW AND PARTS LIST 11-1. DOOR ASSEMBLY Refer to 6. Disassembly and assembly. 11-2. CONTROL PANEL ASSEMBLY Refer to 6. Disassembly and assembly. 11-3. TOTAL ASSEMBLY...
  • Page 33 PART CODE PART NAME DESCRIPTION Q’TY REMARK 3511714040 KOC-1B4K0S 3511714050 KOC-1B4K0S BAUMATIC KOC-1B4K0S BAUMATIC DOOR AS 3511714060 KOC-1B4K5S OMEGA KOC-1B4K5S OMEGA 3511714070 KOC-1B4K9SA1 KOC-1B4K9SA1 KOC-1B4K0S, PKCPSWAD00 KOC-1B4K0S 1B4K0S10,1B4K0S20 CONTROL PANEL AS KOC-1B4K0S01, PKCPSWAD10 KOC-1B4K0S01 1B4K0S31,1B4K9SA1 PKCPSWAD20 KOC-1B4K5S KOC-1B4K5S,1B4K5S10 3515202200 STOPPER HINGE *U AS...
  • Page 34 Q’TY REMARK 4415A17352 SW MICRO VP-533A-0F SPNO #187 200G 4415A66910 SW MICRO VP-531A-0F/SZM-V16-FA-61 3513700800 LEVER LOCK 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN KOC-1B4K0S, 3512717700 HARNESS MAIN KOC-1B0K0S 1B4K0S10,1B4K0S20, B4K5S,1B4K5S10 KOC-1B4K0S01, 3512717710 KOC-1B0KBS 1B4K0S31,1B4K9SA1 7S627W50X1 NUT HEX 6N-1-4 BSNI 3511800700 FAN CONVECTION SA1D T0.5...
  • Page 35 PART CODE PART NAME DESCRIPTION Q’TY REMARK 3510803320 CABINET 3510806800 STS430 KOC-1B4K5S OMEGA 7121400611 SCREW TAPPING T2S PAN 4X6 MFZN 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 3513302800 INSULATOR HEATER *T SECC T0.5 3512520500 GUIDE AIR OUTLET SA1D-80 T0.5 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 3511407800...

  • Page 36: Printed Circuit Board

    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: 220~240V / Frequency: 50Hz Terminal Voltage(load) Voltage(no load) AC 17.0 V AC 19.9 V AC 1.3 V AC 1.6 V 9-10 AC 1.3 V...
  • Page 37 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. - Check method STATE POINT A POINT B RELAY 1 ON +5V DC...
  • Page 38 4. Case of no heating of upper grill When touching GRILL1 & COMBI button, oven lamp turns on and Fan motor and turntable motor rotate and cook indicator in the display comes on. *Cause: RELAY 2 does not operate. STATE POINT A POINT B RELAY 2 ON...
  • Page 39 7. Case of no stopping of the count down timer When the door is opened during operation, the count down timer does not stop. - Check method POINT STATE DOOR OPEN OPEN +5V DC DOOR CLOSED CLOSE CHECK NO METHOD REMEDY Check the stage(ON,OFF) of the door open Replace door open monitor swith.

  • Page 40: Circuit Diagram

    13. P.C.B. CIRCUIT DIAGRAM...
  • Page 41 NAME SYMBOL SPECIFCATION PART CODE Q’TY REMARK PCB MAIN M231 95.5 X 197 3514322720 PCB SUB M232 88 X 197 3514322730 BUZZER BM-20K 3515600100 CAPACITOR CERAMIC C1~C4,C7~C12 104 50V Z AXIAL CCZF1H104Z CAPACITOR CERAMIC C5,C6 102 50V Z AXIAL CCZB1H102K CAPACITOR ELECTRO 50V RS 10uF CEXE1H100A...
  • Page 42 NAME SYMBOL SPECIFCATION PART CODE Q’TY REMARK RY2,RY3 G5G-1A-DT 24V 5SC0101124 42 SW RELAY " (OZF-S-124LM1P) 5SC0101117 43 SW RELAY RY4~RY7 CS11-24SH 5SC0101129 44 TRANSISTOR Q1,Q2 KTA1266Y AUTO TZTA1266Y- 45 TRANSISTOR Q3,Q4,Q12,Q15 KTC3198GR AUTO TZTC3198GR 46 TRANSISTOR KTC-1027Y AUTO TZTC1027Y- 47 TRANSISTOR Q5~Q11,Q13 KRC106M AUTO...
  • Page 43 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. : OC1B4K0001 PRINTED DATE: Dec. 2005...

This manual is also suitable for:

Koc-1b4k0s01Koc-1b4k0s31Koc-1b4k0s10Koc-1b4k0s20Koc-1b4k9sa1Koc-1b4k5s ... Show all

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