Daewoo KOG-8A1R5S Service Manual
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Daewoo KOG-8A1R5S Service Manual

Daewoo KOG-8A1R5S Service Manual

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S/M No. :
Service Manual
Microwave Oven
Model: KOG-8A1R5S
KOG-8A1R5S35
KOG-8A1R5P
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).
Sep. 2009

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  • Page 1 S/M No. : Service Manual Microwave Oven Model: KOG-8A1R5S KOG-8A1R5S35 KOG-8A1R5P 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 KOG-8A1R5S,35: 230V, 50HZ SINGLE PHASE WITH EARTHING POWER SUPPLY KOG-8A1R5P: 220V,60HZ 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)

  • Page 5: External View

    EXTERNAL VIEW 1. OUTER DIMENSION...

  • Page 6: Features Diagram

    2. FEATURES DIAGRAM 3 4 5 1 Door seal - Door seal maintains the microwave energy within the oven cavity and prevents microwave leak- age. 2 Reflector (Insulator Heater) 3 Heating Element 4 Oven cavity 5 Safety interlock system 6 Control Panel 7 Metal rack 8 Coupler - This fits over the shaft in the centre of the ovens cavity floor.

  • Page 7: Control Panel

    3. CONTROL PANEL 1 Display - Cooking time, power level, indicators 7 Grill / Combi -Used to cook Grill/Combi. and present time are displayed. 8 Quick defrost - Used to defrost food very 2 AUTO COOK - Used to cook using a program or Quickly.

  • 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 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. DOOR ASSEMBLY : 3511725150 REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK 3511618010 DECORATOR RING ABS SG-0760D SG-175 COATING 3511604040 DECORATOR DOOR ABS SG-0760D SG-175 3517009820 BARRIER-SCREEN *O SAN CR-5381 SMOG 3512210220 FRAME DOOR ABS SG-0760D SG-175 3515204100 STOPPER HINGE *T AS...
  • 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 surface.
  • Page 14 5. To remove control panel parts. C/PANEL ASSEMBLY : PKCPSWA720(KOG-8A1R5S, KOG-8A1R5P) PKCPSWA730(KOG-8A1R5S35) REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK 3515502310 WINDOW DISPLAY SAN CR-5381 SMOG 3511616830 DECORATOR C-PANEL ABS SG-0760D SG-175 3516735390 CONTROL-PANEL ABS SG-0760D SG-175 3516909570 BUTTON FUNCTION...
  • 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. High voltage circuit wiring 7.
  • Page 16 8. To remove wind guide assembly. 1) Remove the screw for earthing. 2) Remove the noise filter from wind guide. (KOG-8A1R5S,51) * There is no noise filter(KOG-8A1R5P) 3) Remove the screw which secure the wind guide assembly. 4) Draw forward the wind guide assembly.
  • 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 7392500008 NUT HEX 6N-2-5 SUS 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. RD/GY RD/RD RD/GY...

  • 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 board noise filter board Replace Check continuity of Open power sup- 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 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 1) KOG-8A1R5S, KOG-8A1R5S35...
  • Page 28 2) KOG-8A1R5P...

  • Page 29: 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 5-6-7 AC 12.6 V AC 14.7 V NOTE 1.
  • Page 30 Measure Point...
  • Page 31 3. When there is no microwave oscillation 1) When touching the START pad, oven lamp does not turn on. Fan motor do not rotate, but cook indicator in display comes on. - Check method POINT STATE RELAY 2 ON 5VDC RELAY 2 OFF 15VDC 2) When touching the START pad, oven lamp turns on.

  • Page 32: Pcb Circuit Diagram

    2. PCB CIRCUIT DIAGRAM...

  • Page 33: Location No

    3. PCB LOCATION NO. *MAIN PCB ASS'Y NAME SYMBOL SPECIFICATION PART CODE Q’TY BUZZER BM-20K 3515600100 C ARRAY 7P(6) 1000PF M 50V CN6XB-102M CAPACITOR ELEC 50V RS 10UF CEXE1H100A CAPACITOR ELEC 25V RSS 1000MF CEXF1E102V CONNECTOR WAFER YW396-02V 3519150520 CONNECTOR WAFER HLEM15S-1 4CW215SBD0 CONNECTOR WAFER...

  • 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 URETHAN FOAM 15TX150X40 7272400811 SCREW TAPTITE TT3 TRS 4X8 MFZN 3513003200 HOLDER HV CAPACITOR SECC T0.6 3518302201 CAPACITOR HV 2100VAC 0.98UF #187 75MM KOG-8A1R5S,35 3518301901 2100VAC 0.84UF #187 70MM KOG-8A1R5P 3518400900 DIODE HV AS HVR-1X-30B #187 3518701100 FUSE HV 5KV 0.55A HV-41A55-02...
  • Page 36 7272400811 SCREW TAPTITE TT3 TRS 4X8 MFZN 3515201101 STOPPER HINGE *U SCP-1 T2.5 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 3512767950 HARNESS MAIN KOG-8A0R5S(KOG-8A1R5S,35) 3512767960 KOG-8A1R5P 4415A17352 SW MICRO VP-533A-OF SPNO #187 200G 4415A66910 SW MICRO VP-531A-OF/SZM-V16-FA-61 4415A17352 SW MICRO...
  • 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. 2009...
  • Page 38 ABOUT THIS MANUAL ABOUT THIS MANUAL ! ! " " # # " " $ $ % % & & ' ' ( ( ) ) * * + + " " ! ! ) ) , , & & " " % % ' ' - - ./ 012 345 6 78 9:;<...

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