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Daewoo KOC-1C0KB Service Manual

Microwave oven
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S/M No. :
Service Manual

Microwave Oven

Model: KOC-1C0KB
KOC-1C0KBS
KOC-1C4KB
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).
Feb. 2010
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Summary of Contents for Daewoo KOC-1C0KB

  • Page 1: Microwave Oven

    S/M No. : Service Manual Microwave Oven Model: KOC-1C0KB KOC-1C0KBS KOC-1C4KB 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).

  • 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 if 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: Specification

    2. SPECIFICATIONS MODEL KOC-1C0KB / KOC-1C0KBS / KOC-1C4KB POWER SUPPLY 230V~50Hz, SINGLE PHASE WITH earthing MICROWAVE 1450W POWER GRILL 1250W CONSUMPTION CONVECTION 2650W COMBINATION 2750W, MAX 2900W MICROWAVE ENERGY OUTPUT 800W (IEC705) MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 524X375X477mm(20.63X14.76X18.78in)

  • Page 5: 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 6: Control Panel

    4. CONTROL PANEL 1 Display 6 Control Dial Knob ( The display shows you some information such as You can enter cooking time, quantity, weight, and cooking time, menu, quantity and temperature and so temperature by turning the Control Dial knob. 7 Selection( ) Button: You can confirm the contents 2 Quick defrost(...

  • Page 7: Display Window

    1 Display window 5 Icons of cooking menu The display shows you some cooking information such : It means Quick defrost. lights in the display as cooking time, clock, temperature, quantity and so on. during Quick defrosting. : It means Steam cleaning. lights in the display during Steam cleaning.

  • Page 8: Accessories

    6. ACCESSORIES This oven is equipped with several accessories. They can be used in various ways to facilitate cooking. 1 Metal Tray - Put food or proper cookware on the metal tray. NOTE : Metal Tray is attached to the left cushion. 2 Grill Rack - Put the grill rack on the metal tray.
  • Page 9 7. INTERLOCK MECHANISM AND ADJUSTMENT HOW TO USE THE ACCESSORIES OF COOKING 1 Insert Chicken into rotisserie 5 Put the base bowl of steam bowl on the center of bottom The base bowl of steam bowl is usually used to catch any fat and/or grease dripping from food placed directly on the grid or to cook food directly.

  • Page 10: Important Safety Instructions

    STEAM BOWL GUIDE (Optional) Component parts of Steam bowl WARNING: • The oven and steam bowl is very hot after cooking. • Use thick oven globes while you are handing food or accessories. Steam plate Tips : You can cook small items faster than larger ones. And Base bowl uniform sized food will be cooked more evenly.

  • Page 11: Interlock Mechanism And Adjustment

    7. INTERLOCK MECHANISM AND ADJUSTMENT CONDITION : DOOR OPEN LEFT RIGHT RED/RED INTERLOCK MONITOR RED/RED SWITCH BLACK/BLUE BLUE YELLOW WHITE/BLUE BLUE WHITE SWITCH PRIMARY HOOK INTERLOCK SWITCH CONDITION : DOOR CLOSE LEFT RIGHT...

  • Page 12: Wiring Procedure

    8. WIRING PROCEDURE MAIN PCB LOCATION PART NAME WIRING COLOR FUNCTION MW RELAY Black & White, Black & White Control M/W HALOGEN HEATER RELAY White & Red, Black Control halogen heater(Side heater) TOP HEATER RELAY White & Black, Black Control heater top CONVECTION RELAY Blue, Blue Control heater back...

  • Page 13: Wiring Diagram

    9. WIRING DIAGRAM...

  • Page 14: Electrical Parts List

    PART CODE PART NAME SPECIFICATION Q’TY REMARK 3966031300 MOTOR SYNCRO SM16F -HK36T1FY 3518303901 CAPACITOR HV 2100VAC 1.1UF #187 75M +3,-0 3518400400 DIODE HV HVR-1X-3AB 12KV #187 3513601600 LAMP BL 240V 25W T25 C7A H187 3512783930 HARNESS MAIN KOC-1C4K5SC1 3512783940 HARNESS CONVECTION AS KOC-1C4K5SC1 3518701900 FUSE H.V...

  • Page 15: Disassembly And Assembly

    11. 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 16 12. DISASSEMBLY AND ASSEMBLY 1. To remove cabinet 1) Remove four screws on cabinet back. 2) Push the cabinet backward. 2. To remove door ASS'Y 1) Remove each two screws (total 4EA) on left and right sides. 2) Remove spring hinges in both sides. * It is easy to remove the bottom of spring firstly and to set the top of spring firstly.
  • Page 17 4. EXPLODED VIEW AND PARTS LIST OF DOOR ASS'Y. PART CODE PART NAME DESCRIPTION Q'TY REMARK 3512603830 HANDLE DOOR *O ABS SPRAY KOC-1C0KQS 3515309510 SUPPROTER HANDLE PO T1.6 3512603910 HANDLE DOOR *I 3517010720 BARRIER SCREEN *O TEMP GLASS T3.2 WHITE PATTERN 3512210320 FRAME DOOR PC+ABS HR-5007A SPRAY KOC-1C0KQS...
  • Page 18 5. EXPLODED VIEW AND PARTS LIST OF CONTROL PANEL. PART CODE PART NAME DESCRIPTION Q'TY REMARK 3511620110 DECORATOR C-PANEL SAN T1.5 WHITE 3516725920 CONTROL-PANEL PC+ABS HR5007A SPRAY KOC-1COKQS 3516913020 BUTTON FUNCTION-A ABS COATING 3516913010 DECORATOR KNOB ABS COATING 3513411530 KNOB VOLUME ABS SPRAY KOC-1C0KQS 3514333100 PCB MAIN AS...
  • Page 19 6. To remove high voltage capacitor 1) Remove a screw which secure the grounding ring Capacitor Holder terminal of the H.V.diode and capacitor holder. 2) Remove the H.V.capacitor from the capacitor holder. H.V.Capacitor 3) Remove the H.V.diode from the H.V.Capacitor. H.V.Diode 4) Reverse the above steps for reassembly.
  • Page 20 7. TO REMOVE MAGNETRON 1) Remove a screw which secure the magnetron. 2) Remove the magnetron. 3) Reverse the above steps for reassembly. NOTE: Never install the magnetron without the metallic gasket plate which is packed with each magnetron to prevent microwave leakage.
  • Page 21 8. TO REMOVE BLOWER MOTOR 1) Remove a screw which secure the cover motor blower. 2) Remove a screw which secure the blower motor. 3) Remove the cover motor blower. 4) Remove the wire which connecting the blower motor 5) Push a latch of blower motor and draw backward 6) Reverse the above steps for reassembly.
  • Page 22 10. TO REMOVE TOP HEATER 1) Remove a nut which secure the top heater. 2) Pull out the heater. 11. TO REMOVE HALOGEN HEATER (SIDE HEATER) Halogen heater cover 1) Remove a screw in insulator heater top. Halogen heater 2) Remove the wire which connecting the halogen heater. braket 3) Remove a screw on cover of halogen heater.
  • Page 23 12. TO REMOVE STIRRER FAN 1) Remove a screw to the cover wave guide. 2)Push the fixture supporter in top plate. Holder Stirrer 3) Remove a holder stirrer from the stirrer motor. 4) Rotate the holder stirrer about 45°C and reassemble from Supporter groove of the stirrer blade.
  • Page 24 15. EXPLODE VIEW AND PARTS LIST OF BACK HEATER ASSEMBLY C01 C02 PART CODE PART NAME DESCRIPTION Q'TY REMARK 7S628W40X1 NUT HEX NUT FLANGE M4X0.7P MFZN 3511800700 FAN CONVECTION SA1D T0.5 3512808000 HEATER 230V 1400W KAWAI 3512806000 HEATER REFLECTOR SA1D T0.5 3511409800 COVER HEATER *B SA1D-80 T0.5...
  • Page 25 16. TOTAL ASSEMBLY AND PARTS LIST...
  • Page 26 PART CODE PART NAME DESCRIPTION Q'TY REMARK 3511730010 DOOR AS KOC-1C0KB or KOC-1C0K5SC2 3511730020 KOC-1C0KBS or KOC-1C0K5SC3 3511730000 KOC-1C4KB or KOC-1C4K5SC1 PKCPSWAL40 CONTROL-PANEL AS KOC-1C0KB or KOC-1C0K5SC2 PKCPSWAL70 KOC-1C0KBS or KOC-1C0K5SC3 PKCPSWALA0 KOC-1C4KB or KOC-1C4K5SC1 3516120000 CAVITY AS KOC-1C0KQS 3510611600...
  • Page 27 PART CODE PART NAME DESCRIPTION Q'TY REMARK 3514801900 SENSER TEMPERATURE PTM-K312-D10 7S312X40A1 SCREW SPECIAL T1 TRS 4X10 SE MFZN 3512808510 HEATER GRILL 230V 1200W 7113400810 SCREW TAPPING T1 BIN 4X8 STS430 MFZN 3511408320 COVER WAVE GUIDE MICA T1.0 3517101410 STIRRER BLADE AL050-H18 T0.6 3512001100 FIXTURE SUPPORTER STIRRER...

  • Page 28: Component Test Procedure

    12. 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 5. BLOWER MOTOR AND CONVECTION MOTOR 1) Remove a connector from the motor. 2) Measure resistance between two terminals like as following figure. 3) Reading of blower motor is 60Ω and convection motor is 270Ω . 4) It is normal to stop convection motor smoothly, when door is open during convection mode. =>...
  • Page 30 8. POWER CODE 1) Remove a connector from the power code. 2) Check each continuity of N-N and L-L terminal like as following figure. 3) It should be normal to keep continuous continuity. 9. INTERLOCK SWITCH BUTTON There are three terminals in interlock switch : COM, NO, NC. 1) NC and COM terminals are connected by ordinary condition.

  • Page 31: Trouble Shooting Guide

    13. TROUBLE SHOOTING GUIDE Following the procedure 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 tranformer, check continuity with the AC plug removed.
  • Page 32 2. Check points after repair - After repair or replacement of parts, operate the oven in M/W mode. There will be occur following problems. 2-1) Display doesn't show again, after opening and closing the door CHECK RESULT CAUSE AND REMEDY Check the continuity between find the trouble in 1) Replace switch...
  • Page 33 Trouble2) Although display shows, No microwave oscillation or the oven does not start cooking 1. Check points CHECK RESULT CAUSE AND REMEDY Check contact of door hook to Modify location of door and primary interlock switch, monitor Fault contacts door hook or replace door switch and DOM switch assembly Check...
  • Page 34 TROUBLE3) Although display shows, oven cooking is not operated (Including operating problems of start button) 1. Check points CHECK RESULT CAUSE AND REMEDY Check contact of door hook to Modify location of door and primary interlock switch, monitor Fault contacts door hook or replace door switch and DOM switch assembly...
  • Page 35 Trouble4) When "ERROR2" or "ERROR3" come on display DISPLAY When does happen these ERRORs ? Error3 happen that the temperature sensor (thermister) dosen't connect to P.C.B connector Error2 happens if the temperature of cavity is very high After the oven is cooled enough, operate again If Display show "Err2"...
  • Page 36 TROUBLE 5) The following visual conditions 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.

  • Page 37: Printed Circuit Board

    14. PRINTED CIRCUIT BOARD MAIN PCB LOCATION PART NAME FUNCTION MW R ELAY Control M/W HALOGEN HEATER RELAY Control halogen heater (side heater) TOP HEATER RELAY Control top heater CONVECTION RELAY Control back heater SLOW ACTING RELAY Prevent the transient current (while)operating M/W Let a micon decide Open and close of door NO.
  • Page 38 PCB PATTERN DIAGRAM...
  • Page 39 DAEWOO ELECTRONICS CORP. 1-2, Jeo-dong 1(il)-ga, Jung-gu, Seoul, Korea C.P.O. BOX 8003 SEOUL, KOREA TELEX: DWELEC K28177-8 CABLE: “DAEWOOELEC” S/M NO. : PRINTED DATE: Feb. 2010...
  • Page 40 6 번지 이룸빌딩 4 층 담 당 이태희 님 KOC-1C0K5SC2 KOC-1C0KB F F . . M M O O D D E E L L B B . . M M O O D D E E L L KOC-1C0K5SC3 KOC-1C0KBS...

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