Daewoo KOG-8B5R5S Service Manual
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Daewoo KOG-8B5R5S Service Manual

Daewoo KOG-8B5R5S Service Manual

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S/M No. :
Service Manual
Microwave Oven
Model: KOG-8B5R5S/W
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).
OG8B5R5S01
Sep. 2010

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Summary of Contents for Daewoo KOG-8B5R5S

  • Page 1 S/M No. : OG8B5R5S01 Service Manual Microwave Oven Model: KOG-8B5R5S/W 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 800 W MICROWAVE FREQUENCY 2450 MHz OUTSIDE DIMENSIONS (W x H x D) 465 x 287 x 376 mm CAVITY DIMENSIONS (W x H x D) 298 x 230 x 330 mm NET WEIGHT...

  • Page 5: External View

    EXTERNAL VIEW 1. OUTER DIMENSION...

  • Page 6: Feature Diagram

    2. FEATURE DIAGRAM 1 DOOR SEAL - Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage. 2 REFLECTOR(Insulator Heater) 3 HEATING ELEMENT 4 OVEN CAVITY 5 SEFETY INTERLOCK SYSTEM 6 METAL RACK 7 COUPLER - This fits over the shaft in the center of the ovens cavity floor This is to remain in the oven for all cooking. 8 ROLLER GUIDE - This must always be used for cooking together with the glass cooking tray.

  • Page 7: Control Panel

    3. CONTROL PANEL 1 Display - Cooking time, power level, indicators and present time are displayed. 2 Grill/Combi - Used to cook GRILL or COMBI. 3 Power/Def - Used to set power level and DEFROST. 4 Auto cook - Used to cook using a program or to reheat. 5 Start / Easy cook - Used to start the oven operation and also increase the reheat time by 30 seconds.

  • Page 8: 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 9: Operations And Functions

    OPERATIONS AND FUNCTIONS 1. Connect the main lead to an electrical outlet. 2. 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. 3.

  • Page 10: Disassembly And Assembly

    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. You are asked to observe the following precautions carefully.
  • Page 11 1. To remove cabinet 1) Remove three screws on cabinet back. 2) Push the cabinet backward. 2. To remove door assembly 1) Remove the screw 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 3512203851 FRAME DOOR ABS XR-401 COLOR 3517005620 BARRIER-SCREEN*O TEMP GLASS T3.2 3515204100 STOPPER HINGE*T AS KOR-63150S 3511719500 DOOR PAINTING AS KOR-6C0B5S 3517002800 BARRIER-SCREEN*I PE 0.1T 3512300210 GASKET DOOR 3513100750 HOOK...
  • 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 a screws on stopper hinge top, and then push the door to contact the door seal to oven front surface. •...
  • Page 14 ABS SG-0760D SG-175 PKBPMSZY00 SUB PCB AS KOR-634R0S 7121401611 SCREW TAPPING T2S PAN 4X16 MFZN PKMPMSZ100 PCB MAIN MANUAL AS KOG-374R0S(KOG-8B5R5S) PKMPMSZ110 KOG-374R0W(KOG-8B5R5W) 7621301011 SCREW TAPPING T2S TRS 4X12 MFZN 3516904600 BUTTON START ABS SG-0760D SG-175 (1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly.
  • Page 15 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 16 8. To remove wind guide assembly. 1) Remove a screw which secure the wind guide assembly. 2) Draw forward the wind guide assembly. 3) Pull the fan from the motor shaft. 4) Remove two screws which secure the motor shaded pole. 5) Remove 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 SPP T0.8 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.

  • Page 20: Trouble Shooting Guide

    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 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 Outlet has Check continuity of magnetron Continuity magnetron proper voltage. Fuse does Replace Defective not blow. Check continuity of Continuity magnetron noise filter board Replace Open power Check continuity of Continuity power supply cord supply cord Replace Normal...
  • Page 22 (TROUBLE 3) No microwave oscillation even though fan motor rotates. CONDITION CHECK RESULT CAUSE REMEDY Continuity Replace Check continuity of high voltage Defective high microwave capacitor terminals with wires voltage oscillation removed transformer Continuity in Replace Check continuity of high voltage Defective high backward diode in forward and backward...
  • Page 23 (TROUBLE 4) The following visual conditions indicate a probable defective touch control circuit assembly. 1. Incomplete segments (1) Segments missing (2) Partial 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 ±...

  • 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. Low Voltage Transformer check • The low voltage transformer is located on the P.C.B. • Measuring condition: input voltage : 230V/Frequency : 50Hz Terminal Voltage LOAD NO LOAD AC 25.8 V AC 28.4 V NOTE : 1.
  • Page 29 Measure Point...
  • Page 30 Measure Point...
  • Page 31 3. When there is no microwave oscillation 1) When pressing START button, oven lamp does not turn on. Fan motor do not rotate, but cook indicator in display comes on. * Cause : RELAY 2 does not operate. refer to Circuit Diagram (Point 3) - Check method POINT STATE...

  • Page 32: Circuit Diagram

    2. PCB CIRCUIT DIAGRAM...

  • Page 33: Location No

    TRANSISTOR Q1~5, Q7~10 KRA-106M TZRA106M-- TRANSISTOR KTA-1266Y TZTA1266Y- TRANS POWER LVT1 DMR-631FS 5EPV035303 KOG-8B5R5W DMR-631FS EU 5EPK035303 KOG-8B5R5S WIRE COPPER J1~J5,J8,J10~13,J15,J17 1/0.52 TIN COATING 85801052GY 7.5mm WIRE COPPER J9,J14,J16 1/0.52 TIN COATING 85801052GY 10.0mm WIRE COPPER J6,J7 1/0.52 TIN COATING 85801052GY 12.5mm...

  • 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 REF. NO PART CODE PART NAME DESCRIPTION Q'TY 3511730210 DOOR AS KOR-8B5R5S PKCPSWZ200 CONTROL-PANEL AS KOG-375R0S(KOG-8B5R5S) PKCPSWZ210 KOG-375R0W(KOG-8B5R5W) 3513302720 INSULATOR HEATER AS KOG-8A0R5S 3510805300 CABINET AS KOR-61150S 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 3516109980 CAVITY AS KOG-8A0R5S 3511413700 COVER REAR SBHG T0.4...
  • Page 36 REF. NO PART CODE PART NAME DESCRIPTION Q'TY 3515201101 STOPPER HINGE *U SCP-1 T2.5 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 3512767950 HARNESS MAIN KOG-8A0R5S 4415A17352 SW MICRO VP-533A-OF SPNO #187 200G 4415A66910 SW MICRO VP-531A-OF/SZM-V16-FA-61 4415A17352 SWITCH PUSH VP-533A-OF SPNO #187 200G 3513702620 LEVER LOCK 3513811750...
  • Page 37 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: Sep. 2010...
  • Page 38 V V I I S S I I O O N N C C R R E E A A T T I I V V E E , , I I N N C C . . 서울 종로구 통의동 6 번지 이룸빌딩 4 층 담 당 김영진 님 M O D E L KOG-8B5R5S/W (S/M) 접 수 2010.09.08 1차 2차 일...

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