DAEWOO ELECTRONICS KOG-8A2B5S Service Manual
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DAEWOO ELECTRONICS KOG-8A2B5S Service Manual

DAEWOO ELECTRONICS KOG-8A2B5S Service Manual

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S/M No. :
Service Manual
Microwave Oven
Model: KOG-8A2B5S
✔
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. 2014

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Summary of Contents for DAEWOO ELECTRONICS KOG-8A2B5S

  • Page 1 S/M No. : Service Manual Microwave Oven Model: KOG-8A2B5S ✔ 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 micro- wave 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 POWER SUPPLY 230V~50Hz, SINGLE PHASE WITH EARTHING MICROWAVE 1200 W POWER GRILL 1050 W CONSUMPTION COMBINATION 2200 W MICROWAVE ENERGY OUTPUT 800W MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W x H x D) 465 x 287 x 368mm CAVITY DIMENSIONS (W x H x D) 298 x 230 x 330mm CAVITY VOLUME 23 L...

  • Page 5: External View

    EXTERNAL VIEW 1. OUTER DIMENSION...

  • Page 6: Features Diagram

    2. FEATURES DIAGRAM 1 Door latch - When the door is closed, it will automati- 8 Roller guide - This must always be used for cooking cally shut off. If the door is opened while the oven is together with the glass cooking tray. operating, the magnetron will automatically shut off.

  • Page 7: Control Panel

    3. CONTROL PANEL 1 Display - Cooking time, power level, indicators and 8 Quick defrost - Used to defrost food very Quickly. present time are displayed. 9 Clock - Used to set clock. 2 AUTO COOK - Used to cook using a program or to 0 Up / Down - Used to set the weight and quantity.

  • 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: Operations And Functions

    OPERATIONS AND FUNCTIONS 11. Connect the mains lead to an electrical outlet. 12. After placing the food in a suitable container, open the oven door and put it on the glass tray. The glass tray must always be in place during cooking. 13.

  • Page 10: Disassembly And Assembly

    DISASSEMBLY AND ASSEMBLY Cautions to be observed when troubleshooting. 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. You are asked to observe the following precautions carefully.
  • Page 11 1. To remove cabinet 1) Remove three screws on cabinet back. 2) Pull 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 12 3. To remove door parts. REF. NO PART CODE PART NAME DESCRIPTION Q'TY REMARK 3517009830 BARRIER-SCREEN *O SAN 1.5T 3512210230 FRAME DOOR HIPS SG-970, HG-1760H 3515204100 STOPPER HINGE *T AS KOR-63150S 3511719500 DOOR PAINTING AS KOR-6C0B5S 3517002800 BARRIER-SCREEN *I POLYESTER T0.1 3512300210 GASKET DOOR 3513100750...
  • Page 13 4. 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 the stopper hinge top, and then push the door to contact the door seal to the oven front sur- face.
  • Page 14 3516735420 CONTROL-PANEL HIPS SG-970, HG-1760H PKMPMSZXG0 PCB MAIN MANUAL AS KOG-8A2B5S(SMPS MODULE) 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN (1) Disconnect wire flat from the connector of the PCB assembly. (2) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assem- bly.(3) Remove screws which secure the main PCB assembly to control panel.
  • Page 15 6. To remove high voltage capacitor. 1) Remove the 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. ◆...
  • Page 16 8. To remove wind guide assembly. 1) Remove the screw for earthing. 2) Remove the noise filter from the wind guide. 3) Remove the 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 17 10. To remove tray motor. 1) Remove the coupler in the cavity. 2) Turn the set upside down. 3) Cut the tray motor cover part from the base plate. 4) Remove the tray motor cover. 5) Remove a screw which secure the tray motor. 6) Remove the tray motor.
  • Page 18 12. To remove heater parts. REF. NO PART CODE PART NAME DESCRIPTION Q'TY REMARK 7392500013 NUT HEX 6N-2-5 MFCR 3515001200 SPACER INSULATOR *I C3771BD A=24.2 3513301100 INSULATOR HEATER PAINTING 3512803410 HEATER 230V 1000W 1SOPE 47501 7002500613 SCREW MACHINE TRS 5X6 MFCR 7002400814 SCREW MACHINE TRS 4X8 MFCR...

  • Page 19: 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. Primary interlock switch...

  • Page 20: Troubleshooting Guide

    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 transformer, disconnect one lead wire from these parts and check continuity with the AC plug removed.
  • Page 21 CONDITION CHECK RESULT CAUSE REMEDY Replace Defective mag- Outlet has Check continuity of magnetron Continuity netron proper volt- age Fuse does not Replace Check continuity of Defective line filter blow. Continuity noise filter board board Replace Open power sup- Check continuity of Continuity ply cord power supply cord...
  • Page 22 (TROUBLE 3) No microwave oscillation even though fan motor rotates. CONDITION CHECK RESULT CAUSE REMEDY Continuity microwave Check continuity of high oscillation voltage fuse Replace high voltage fuse Continuity Replace Check continuity of high Defective high voltage capacitor terminals voltage trans- with wires removed former Continuity in...
  • Page 23 (TROUBLE 4) The following visual conditions indicate a probable defective touch control circuit or membrane switch assembly. 1. Incomplete segments (1) Segments missing (2) Partical segments missing (3) Digit flickering other than normal display slight flickering (4) “ :0” does not display when power is on. 2.

  • Page 24: 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 with the microwave oven supplied at rated voltage and operated at its maximum microwave power setting with a load of 1000±5cc of potable water.

  • Page 25: Microwave Radiation Test

    2. MICROWAVE RADIATION TEST CAUTION : 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 26: 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 27: Wiring Diagram

    WIRING DIAGRAM...

  • Page 28: Printed Circuit Board

    PRINTED CIRCUIT BOARD 1. CIRCUIT CHECK PROCEDURE 1. SMPS MODULE check The SMPS MODULE is located on the P.C.B. Measuring condition: Input voltage: 230V / Frequency: 50Hz Terminal Voltage LOAD NO LOAD 4,5-6 DC 12V ± 0.6V DC 12V ± 0.6V NOTE 1.
  • Page 29 Measure Point...
  • Page 30 3. When there is no microwave oscillation 1) When touching START button, oven lamp does not turn on. Fan motor does not rotate, but cook indicator in display comes on. - Check method POINT STATE RELAY 2 ON 5VDC RELAY 2 OFF 12VDC 2) When touching START button, oven lamp turns on.
  • Page 31 5. When the door is opened during operation, the count down timer does not stop. - Check method POINT STATE DOOR OPEN OPEN 5VDC DOOR CLOSED CLOSE CHECK NO METHOD REMEDY Check the stage(ON,OFF) of the door open Replace door open monitor swith. monitor switch by resistance measurement.

  • Page 32: Pcb Circuit Diagram

    2. PCB CIRCUIT DIAGRAM...

  • Page 33: Location No

    3. PCB LOCATION NO. NAME SYMBOL SPECIFICATION PART CODE Q’TY BUZZER BM-20K (BUJEON) 3515600100 C ARRAY 7P(6) 1000PF M 50V 2.54MM CN6XB-102M C CERA C3,5 50V B 1000PF K (AXIAL) CCZB1H102K C CERA C1,4,6,7 HIKF 50V 0.1MF Z AXIAL CCZF1H104Z C ELECTRO 25V RSS 1000MF (13X20) TP CEXF1E102V...

  • Page 34: Exploded View And Parts List

    EXPLODED VIEW AND PARTS LIST 1. DOOR ASSEMBLY Refer to Disassembly and assembly. 2. CONTROL PANEL ASSEMBLY Refer to Disassembly and assembly. 3. TOTAL ASSEMBLY...
  • Page 35 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 Q'TY 3511725170 DOOR AS KOR-8A2B5S PKCPSWBH50 CONTROL-PANEL AS KOG-8A2B5S 3513302720 INSULATOR HEATER AS KOG-8A0R5S 3510805300 CABINET AS KOR-61150S 7S312X40A1 SCREW SPECIAL T1 TRS 4X10 SE MFZN 3516109980 CAVITY AS...
  • Page 36 ✔ 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 37 DONGBU DAEWOO ELECTRON- ICS 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. 2014...
  • Page 38 ABOUT THIS MANUAL ABOUT THIS MANUAL...

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