DAEWOO ELECTRONICS KOC-922T9S Service Manual
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DAEWOO ELECTRONICS KOC-922T9S Service Manual

DAEWOO ELECTRONICS KOC-922T9S Service Manual

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Service Manual
Microwave Oven
Model: KOC-922T9S
KOC-922T9R
KOC-923T9S
KOC-923T9R
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
S/M No. : C922T9S001
Oct. 2003

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Summary of Contents for DAEWOO ELECTRONICS KOC-922T9S

  • Page 1 S/M No. : C922T9S001 Service Manual Microwave Oven Model: KOC-922T9S KOC-922T9R KOC-923T9S KOC-923T9R 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: Specifications

    2. SPECIFICATIONS MODEL KOC-922T9S/923T9S POWER SUPPLY 230V~50HZ, SINGLE PHASE WITH EARTHING MICROWAVE 1500W POWER GRILL 1150W CONSUMPTION CONVECTION 2550W COMBINATION 3000W MICROWAVE ENERGY OUTPUT 1000W(IEC705) MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 542X329X503mm (21.3X13.0X19.8 in.) CAVITY DIMENSIONS (W X H X D) 350X230X355mm (13.8X9.1X14.0 in.)

  • Page 5: External View

    3. EXTERNAL VIEW 1. OUTER DIMENSION...

  • Page 6: 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 7: Installation

    Keep the oven away from hot air, steam or splash when choosing a place to position it, or the insulation might be adversely affected and breakdowns occur. 5. Power supply Check your local power source. This microwave oven requires a current of approximately 15(KOC-922T9S/923T9S) 12(KOC-922T9R/923T9R) amperes, 230V, 50Hz. Power supply cord is about 1.2 meters long.

  • Page 8: Control Panel

    5. CONTROL PANEL KOC-922T9S, KOC-922T9R 1 Display : Cooking time, power level, indicators and present time are displayed. MW : When blinking, the oven is operating in MICROWAVE COOK. Grill : When blinking, the oven is operating in GRILL. Combi : When blinking, the oven is operating in COMBI.
  • Page 9 KOC-923T9S, KOC-923T9R 1 Display : Cooking time, power level, indicators and present time are displayed. MW : When blinking, the oven is operating in MICROWAVE COOK. Grill : When blinking, the oven is operating in GRILL. Combi : When blinking, the oven is operating in COMBI. Defrost Weight : When blinking, the oven is operating in WEIGHT DEFROST.

  • Page 10: 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 11 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.
  • Page 12 3. To remove door parts. REF NO. PART CODE PART NAME DESCRIPTION Q TY REMARK 3512204830 FRAME DOOR ABS SR-0320 3517007150 BARRIER-SCREEN*0 GLASS T3.2 MIRROR 3515304800 SUPPORTER HINGE*T SCP-1 T2.0 3516602200 DOOR PLATE SBHG-3A T0.7 3517007000 BARRIER-SCREEN*I TEMP GLASS T2.0 3512302400 GASKET DOOR 3513101200...
  • Page 13 (1) Remove the gasket door from door plate. (2) Remove the door frame from door plate. (3) Remove the stopper hinge top from door plate. (4) Remove the spring and the hook. (5) Remove the barrier screen outer from door frame. (6) Reverse the above steps for reassembly.
  • Page 14 BUTTON FUNCTION-C ABS SR-175 SG-0760D SPRAY 3516909960 BUTTON FUNCTION-B ABS SR-175 SG-0760D SPRAY 3513406600 KNOB VOLUME ABS SR-175 SG-0760D PKMPMSYQ00 PCB MAIN MANUAL AS KOC-922T9S 922T9S PKMPMSYQ10 KOC-922T9R 922T9R 7121301011 SCREW TAPPING T2S PAN 3X10 MFZN PKBPMSYQ00 PCB BUTTON MANUAL AS...
  • Page 15 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). REF NO. PART CODE PART NAME DESCRIPTION...
  • Page 16 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 17 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 18 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). 10. To remove Top heater assembly parts. REF NO.
  • Page 19 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). 11. To remove Rear heater assembly parts. REF NO.

  • Page 20: 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 21: Trouble Shooting Guide

    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.
  • Page 22 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 board filter board Open power Check continuity of Replace continuity supply cord power supply cord Defective touch...
  • Page 23 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 24 (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 25 (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.

  • Page 26: Mesurement And Test

    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.

  • Page 27: Microwave Radiation Test

    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

    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

    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...

  • Page 31: Exploded View And Parts List

    11. EXPLODED VIEW AND PARTS LIST 1. DOOR ASSEMBLY Refer to 6. Disassembly and assembly. 2. CONTROL PANEL ASSEMBLY Refer to 6. Disassembly and assembly. 3. TOTAL ASSEMBLY...
  • Page 32 So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr). PART CODE PART NAME DESCRIPTION Q’TY NOTE 3511714540 DOOR AS KOC-922T9S PKCPSWYQ00 CONTROL PANEL AS KOC-922T9S PKCPSWAS00 KOC-923T9S PKCPSWYQ10 KOC-922T9R PKCPSWAS10...
  • Page 33 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). PART CODE PART NAME DESCRIPTION Q’TY...

  • Page 34: Printed Circuit Board

    2. The allowable tolerance of the secondary voltage is within 5% of nominal voltage. 2. Voltage Check - Key check point CHECK POINT REMARK IC1 PIN 20, 21(KOC-922T9S/R) 5VDC 5% IC1 PIN 26, 27(KOC-923T9S/R) IC1 PIN 22 (KOC-922T9S/R) T : 20 ms(50Hz) IC1 PIN 28 (KOC-923T9S/R)
  • Page 35 MEASURE POINT OF KOC-922T9S/R...
  • Page 36 MEASURE POINT OF KOC-923T9S/R...
  • 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. 16(KOC-922T9S/R) (KOC-922T9S/R) 30(KOC-923T9S/R) (KOC-923T9S/R) Q4(KOC-922T9S/R) Q5(KOC-923T9S/R)
  • Page 38 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. 17(KOC-922T9S/R) (KOC-922T9S/R) 32(KOC-923T9S/R) (KOC-923T9S/R)
  • Page 39 6. Case of no stopping of the count down timer When the door is opened during operation, the count down timer does not stop. D.O.M SW (KOC-922T9S/R) D.O.M SW (KOC-923T9S/R) POINT STATE DOOR OPEN OPEN +5V DC DOOR CLOSED CLOSE...

  • Page 40: Circuit Diagram

    13. P.C.B. CIRCUIT DIAGRAM KOC-922T9S/R...
  • Page 41 KOC-923T9S/R...
  • Page 42 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). PCB ASS Y PART LIST KOC-922T9S/R NAME SYMBOL SPECIFCATION PART CODE Q’TY...
  • Page 43 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). KOC-923T9S/R NAME SYMBOL SPECIFCATION...
  • Page 44 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. : C922T9S001 PRINTED DATE: Oct. 2003...

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