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Daewoo KOC-154K8S Service Manual

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S/M No. : OC154K8001
Service Manual
Microwave Oven
Model: KOC-154K8S
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
Oct. 2006

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  • Page 1 S/M No. : OC154K8001 Service Manual Microwave Oven Model: KOC-154K8S 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 Oct.

  • 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 MODEL KOC-154K8S POWER SUPPLY 230V~50Hz, SINGLE PHASE WITH EARTHING MICROWAVE 1550W POWER GRILL 1550W CONSUMPTION CONVECTION 2550W COMBINATION 2950W MICROWAVE ENERGY OUTPUT 950W(IEC705) MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 582X379.1X518.2mm (22.9x14.9x20.4 in.) CAVITY DIMENSIONS (W X H X D) 390X285.5X383mm (15.4x11.2x15.1 in.)

  • Page 5: Feature Diagram

    2. FEATURE DIAGRAM 1. DOOR HOOK 8. ROLLER GUIDE When the door is closed, it will automatically lock This must always be used for cooking together with shut. If door is opened while oven is operating, the the turntable tray. magnetron will immediately stop operating.

  • 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

    5. CONTROL PANEL DISPLAY WINDOW 1. MICROWAVE - indicator, showing microwaving in progress. 2. DEFROST - indicator, showing defrosting in progress. 3. GRILL(upper grill heater) - indicator, showing griling in progress. 4. GRILL(lower grill heater) - indicator, showing griling in progress. 5.

  • 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 safe 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 5 screws on the cabinet back and side. 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 3515204900 STOPPER HINGE *T AS KOC-1B0K0S 3511714110 DOOR SEAL AS KOC-154K8S 3512302800 GASKET DOOR 3513101800 HOOK 3515101800 SPRING HOOK 3517008920 BARRIER-SCREEN *O GLASS T3.2 TEMPERED 3512607400 HANDLE AS KOC-154K8S 3516006800 SPECIAL BADGE AL KOC-154K8S 7122401211 SCREW TAPPING T2S TRS 4X12...
  • Page 11 (1) Remove the gasket door from door plate. (2) Remove two screws from the handle assembly secured to door frame. (3) Remove the handle door and barrier screen outer from door frame. (4) Remove the door frame from door plate. (5) Remove the stopper hinge top from door plate.
  • Page 12 DECORATOR C-PANEL STS TO.5 #4 3516735400 CONTROL-PANEL 3516916000 BUTTON FUNCTI0N-A 3516916100 BUTTON FUNCTI0N-B 3516916200 BUTTON FUNCTI0N-C PKBPMSF200 PCB BUTTON MANUAL AS KOC-154K8S 3517401700 COUPLER VPC KNOB 3513411400 KNOB FUNCTION 3513411500 KNOB VOLUME 3511617400 DECORATOR RING 7621301011 SCREW TAPPING T2S PAN 3X10...
  • 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 Guide air assembly parts. PARTS CODE PARTS NAME DESCRIPTION Q'TY REMARK 3512525200 GUIDE AIR 3513601600 LAMP BL 240V 25W T25 C7A H187 3515102700 SPRING TERMINAL SUS301 T0.5 3966310100 MOTOR SYNCRO 220V 2.5W GM-16-24FD12 3510609100 BRACKET DAMPER SBHG T0.7 7112401011 SCREW TAPPING T1 TRS 4X10...
  • 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 3512523600 GUIDE AIR OUTLET SBHG T0.5 3513304000 INSULATOR HEATER *T SECC TO.5 3511407600 COVER HEATER *T STS430 T0.4 3512806010 REFLECTOR HEATER *T 3512803800...
  • Page 17 MOTOR SHADED POLE 230V 50HZ MW10CA-T03 7400104011 WASHER PLAIN PW-1-4 MFZN 3511800900 7402704600 RING C CR-5 SK5 3512781310 HARNESS CONVECTION AS KOC-154K8S 7113400814 SCREW TAPPING T1 BIN 4X8 MFNI 7001401065 SCREW MACHINE PAN 4X10 BSNI 7S627W40X1 SPECIAL SCREW NUT FLANGE M4 7113400814...
  • Page 18 13. To remove Motor synchro. And Under heater assembly parts. CUTTING (6EA) REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK 3512802000 HEATER *U 230V 400W R18374001 3511407500 COVER HEATER *U STS430 T0.5 3515304000 SUPPORTER HEATER *U STS430 T0.5 7113400814 SCREW TAPPING T1 BIN 4X8 MFNI 7113400814...

  • 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 COMBI-1 MANUAL COMBI-2 MODE COMBI-3 COMBI-4 COMBI-5 CONVECTION40 CONVECTION100~250 FRESH PIZZA FROZEN PIZZA TOUCH FRESH GRATIN (CRUSTY/ FROZEN GRATIN CAKE) CAKE BREAD ROAST BEEF ROAST CHICKEN AUTO...

  • Page 30: Wiring Diagram

    10. WIRING DIAGRAM...

  • Page 31: Exploded View And Parts List

    11. EXPLODED VIEW AND PARTS LIST TOTAL ASSEMBLY * From A00 to G00 and P00, refer to 6. Disassembly and assembly.

  • Page 32: Door Assembly

    TT3 HEX 4X8 FLG MFZN 3511408300 COVER WAVE GUIDE MICA T0.35 3517402500 COUPLER PTFE 3512521000 GUIDE ROLLER AS KOC-1B0K0S 3517207600 TRAY DIA:340 1300G 3517211100 TRAY METAL AS KOC-1B0K0S 3517207330 TRAY RACK AS KOC-154K8S 50MM 3517207320 TRAY RACK AS KOC-154K8S 160MM 3511411500 COVER LAMP...

  • Page 33: 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 34 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 35 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 4 does not operate. STATE POINT A POINT B RELAY 4 ON...
  • Page 36 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 37: Circuit Diagram

    13. P.C.B. CIRCUIT DIAGRAM...
  • Page 38 NAME LOCATION PART CODE SPECIFICATION Q'TY REMARK BUZZER 3515600100 BM-20K C CERA C1~4,7~13 CCZF1H104Z 50V HIKF 0.1uF Z C CERA C5,6 CCZB1H102K 50V B 1000pF K C ELECTRO CEXE1H100A 50V RS 10uF (5X11) TP C ELECTRO EC2,EC3 CEXF1V221V 35V RSS 220uF (10X12.5) TP C ELECTRO CEXF1V102V 35V RSS 1000uF (13X25) TP...
  • Page 39 NAME LOCATION PART CODE SPECIFICATION Q'TY REMARK 42 SW RELAY RY1,2 5SC0101122 G5G-1A 1C 1P DC24V 43 SW RELAY RY3~5 5SC0101124 G5G-1A-DT 1C 1P DC24V 44 SW RELAY RY6~9 5SC0101129 CS11-24SH 1C 1P 45 TR Q5~8,10~14,17 TZRC106M-- KRC-106M (AUTO) 46 TR Q1,4 TZTA1266Y- KTA-1266Y (AUTO) (1015Y)
  • Page 40 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. : PRINTED DATE: Oct. 2006...

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