Daewoo KOG-370A0P Service Manual
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Daewoo KOG-370A0P Service Manual

Daewoo KOG-370A0P Service Manual

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S/M No. : G370A0P001
Service Manual
Microwave Oven
Model : KOG-370A0P
KOG-390A0P
DAEWOO ELECTRONICS CO., LTD
OCT. 1999
http : //svc.dwe.co.kr

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  • Page 1 S/M No. : G370A0P001 Service Manual Microwave Oven Model : KOG-370A0P KOG-390A0P DAEWOO ELECTRONICS CO., LTD OCT. 1999 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 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 MODEL KOG-370A KOG-390A POWER SUPPLY 220V,60Hz, SINGLE PHASE WITH EARTHING MICROWAVE 1200W 1300W POWER GRILL 1050W 1050W CONSUMPTION COMBINATION 2200W 2350W MICROWAVE ENERGY OUTPUT 800W 900W MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 465 x 279 x 360mm (18.3 x 11.0 x 14.2 in.) 495 x 294 x 388mm (19.5 x 11.6 x 15.3 in.) CAVITY DIMENSIONS (W X H X D) 290 x 220 x 306 mm (11.4 x 8.7 x 12.0 in.)

  • Page 5: External View

    EXTERNAL VIEW 1. OUTER DIMENSION 465/495 360/388...

  • Page 6: Feature Diagram

    EXTERNAL VIEW 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. DOOR RELEASE BUTTON - By pushing this button the latch system cut off all circuits and stops the oven before the door is opened.

  • Page 7: Control Panel

    EXTERNAL VIEW 3. CONTROL PANEL COMBI TIMER/g DEF. GRILL 1. Bread 2. Soup Auto 3. Baked Potato Cook 4. Fresh Vegetable 5. Frozen Vegetable One Touch Cook Auto Defrost Dish Warmer Meat Frozen Pizza Poultry Beverage Fish Pasta Combi Grill Defrost Kitchen Power...

  • Page 8: Installation

    ¢ Ñ 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 safety 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 DISASSEMBLY AND ASSEMBLY 1. To remove cabinet 1) Remove three screws on cabinet back. 2) Push the cabinet backward. 2. To remove door assembly 1) Remove a 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 DISASSEMBLY AND ASSEMBLY 3. To remove door parts. DOOR ASSEMBLY KOG-370A : 3511710320 KOG-390A : 3511710720 (1) KOG-370A REF. NO PART CODE PART NAME DESCRIPTION REMARK 3512203810 FRAME DOOR ABS XR-401 H-2938 3517003050 BARRIER-SCREEN*O ACRYL 3515304610 SUPPORTER BARR-S*O 3515204100 STOPPER HINGE *T AS KOR-63150S 3511705500 DOOR WELD AS...
  • Page 13 DISASSEMBLY AND ASSEMBLY 1) Remove the gasket door from door weld as. 2) Remove the barrier screen inner from door weld as. 3) Remove the door frame from door weld as. 4) Remove the stopper hinge top from door weld as. 5) Remove the spring and the hook.
  • Page 14 DISASSEMBLY AND ASSEMBLY 5. To remove control panel parts. CONTROL-PANEL ASSEMBLY KOG-370A : PKCPSWBV00 KOG-390A : PKCPSWBW00 (1) KOG-370A REF.NO PART CODE PART NAME DESCRIPTION REMARK 3518521620 SWITCH MEMBRANE KOG-370A0S 3516719410 CONTROL-PANEL ABS XR-401 H-2938 PKMPMSBT00 PCB MAIN AS KOG-371G0S 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN...
  • Page 15 DISASSEMBLY AND ASSEMBLY 1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly. 2) Remove the door open lever from the control panel. 3) Remove four screws which secure the PCB assembly to control panel. 4) Disconnect membrane tail from the connector of the PCB assembly.
  • Page 16 DISASSEMBLY AND ASSEMBLY 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 DISASSEMBLY AND ASSEMBLY 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 DISASSEMBLY AND ASSEMBLY 12. To remove heater parts. INSULATOR HEATER AS : 3513302710 REF.NO PART CODE PART NAME DESCRIPTION REMARK 7392500008 NUT HEX 6N-2-5 SUS 3515000600 SPACER INSULATOR *I C3771BD 3513301100 INSULATOR HEATER SPP T0.8 3512803500 HEATER 220V 1000W 1SOPE47503 7002500613 SCREW MACHINE TRS 5X6 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. (1) Primary interlock switch When the door is closed, the hook locks the oven door.

  • Page 20: Trouble Shooting Guide

    TROUBLE SHOOTING GUIDE Following the procedure below to check if the oven is defective or not. 1) Check earthing 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 TROUBLE SHOOTING GUIDE CONDITION CHECK RESULT CAUSE REMEDY Replace Check continuity of Defective Outlet has magnetron Continuity magnetron proper voltage Fuse does not blow. Check continuity of Replace Defective line noise filter board Continuity filter board Open power Replace Check continuity of power supply cord supply cord Continuity...
  • Page 22 TROUBLE SHOOTING GUIDE ( TROUBLE 3 ) No microwave oscillation even though fan motor rotates. CONDITION CHECK RESULT CAUSE REMEDY No Continuity No microwave Check continuity of high oscillation voltage fuse Replace high voltage fuse Replace Continuity Defective Check continuity of high high voltage voltage capacitor transformer...
  • Page 23 TROUBLE SHOOTING GUIDE ( 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.

  • 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

    MEASUREMENT AND 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

    MEASUREMENT AND TEST 3. COMPONENT TEST PROCEDURE High voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle. ¢ º It is neither necessary nor advisable to attempt measurement of the high voltage. ¢...

  • 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: 220V / Frequency: 60Hz Terminal Voltage LOAD NO LOAD 4 - 7 AC 12.6 V AC 14.7 V NOTE 1.
  • Page 29 PRINTED CIRCUIT BOARD Measure Point...
  • Page 30 PRINTED CIRCUIT BOARD 3. When there is no microwave oscillation 1) When touching START pad, oven lamp does not turn on. Fan motor do not rotate, but cook indicator in display comes on. * Cause : RELAY 2 does not operate. ¡ æ refer to Circuit Diagram ( Point 3) - Check method POINT STATE...

  • Page 31: Pcb Circuit Diagram

    PRINTED CIRCUIT BOARD 2. P.C.B. CIRCUIT DIAGRAM...

  • Page 32: Location No

    PRINTED CIRCUIT BOARD 3. P.C.B. LOCATION NO (1) KOG-370A NAME SYMBOL SPECIFICATION PART CODE Q'TY BUZZER BM-20K 3515600100 C ARRAY 7P(6) 102 M 50V CN6XB-102M CAPACITOR ELEC 16V RSS 100uF CEXF1C101V CAPACITOR ELEC 25V RSS 1000uF CEXF1E102V CONNECTOR WAFER YW396-02AV 3519150520 CONNECTOR WAFER YW396-05AV...
  • Page 33 PRINTED CIRCUIT BOARD (2) KOG-390A NAME SYMBOL SPECIFICATION PART CODE Q'TY BUZZER BM-20K 3515600100 C ARRAY 7P(6) 102 M 50V CN6XB-102M CAPACITOR ELEC 16V RSS 100uF CEXF1C101V CAPACITOR ELEC 25V RSS 1000uF CEXF1E102V CONNECTOR WAFER YW396-02AV 3519150520 CONNECTOR WAFER YW396-05AV 3519150510 CONNECTOR WAFER FCZ254-11...

  • 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 EXPLODED VIEW AND PARTS LIST (1) KOG-370A PART RECOMENDED FOR STOCK REF NO PART CODE PART NAME DESCRIPTION Q'TY DOOR AS Refer to disassembly and assembly Refer to disassembly and assembly CONTROL PANEL AS Refer to disassembly and assembly Refer to disassembly and assembly INSULATOR HEATER AS Refer to disassembly and assembly Refer to disassembly and assembly...
  • Page 36 EXPLODED VIEW AND PARTS LIST REF NO PART CODE PART NAME DESCRIPTION Q'TY 4415A66910 SW MICRO VP-531A-OF/SZM-V16-FA-61 4415A17352 SW MICRO VP-533A-OF SPNO #187 200G 3513702600 LEVER LOCK 3513811700 LOCK 3513601600 LAMP BL 240V 25W T25 C7A H187 7121400611 SCREW TAPPING T2S PAN 4X6 MFZN 3966310100 MOTOR SYNCRO...
  • Page 37 EXPLODED VIEW AND PARTS LIST (2) KOG-390A PART RECOMENDED FOR STOCK REF NO PART CODE PART NAME DESCRIPTION Q'TY DOOR AS Refer to disassembly and assembly Refer to disassembly and assembly CONTROL PANEL AS Refer to disassembly and assembly Refer to disassembly and assembly 3513302710 INSULATOR HEATER AS Refer to disassembly and assembly...
  • Page 38 EXPLODED VIEW AND PARTS LIST REF NO PART CODE PART NAME DESCRIPTION Q'TY 4415A66910 SW MICRO VP-531A-OF/SZM-V16-FA-61 4415A17352 SW MICRO VP-533A-OF SPNO #187 200G 3513702600 LEVER LOCK 3513811700 LOCK 3513601600 LAMP BL 240V 25W T25 C7A H187 7121400611 SCREW TAPPING T2S PAN 4X6 MFZN 3966310100 MOTOR SYNCRO...
  • Page 39 DAEWOO ELECTRONICS CO., LTD 686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX : DWELEC K28177-8 CABLE : “ DAEWOOELEC” E-mail : G7F00E@web.dwe.co.kr FAX : 032) 510-7630 TEL : 032) 510-7628 PRINTED DATE : OCT. 1999...

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