DAEWOO ELECTRONICS KOR-637V Service Manual
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DAEWOO ELECTRONICS KOR-637V Service Manual

DAEWOO ELECTRONICS KOR-637V Service Manual

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S/M No.:R637V0A001
Service Manual
Microwave Oven
MODEL : KOR-637V
DAEWOO ELECTRONICS CO., LTD
AUG. 2001
http : //svc.dwe.co.kr

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Summary of Contents for DAEWOO ELECTRONICS KOR-637V

  • Page 1 S/M No.:R637V0A001 Service Manual Microwave Oven MODEL : KOR-637V DAEWOO ELECTRONICS CO., LTD AUG. 2001 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 KOR-637V POWER SUPPLY 120V ~ 60Hz, SINGLE PHASE WITH EARTHING POWER MICROWAVE 1200W CONSUMPTION GRILL COMBINATION UV LAMP MICROWAVE ENERGY OUTPUT 800W MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS(W X H X D) 465 x 279 x 360 mm (18.3 x 11.0 x 14.2 in.)

  • Page 5: External View

    EXTERNAL VIEW 1. OUTER DIMENSION...

  • Page 6: Feature Diagram

    EXTERNAL VIEW 2. FEATURE DIAGRAM 1. Safety interlock system 2. Door screen - Allows viewing of food. The screen is transparent to light, but prevents microwaves escaping. 3. Door latch - When the door is closed, it will automatically shut off. If the door is opened while the oven operating, the magnetron tube will immediately stop operating.

  • Page 7: Control Panel

    EXTERNAL VIEW 3. Control panel 1. Auto cook - Used to cook using a program or to reheat. 2. UV Purification - Used to purify baby bottle, cup, plate, etc. 3. Power/Def - Used to set power level and to defrost foods by weight or time. 4.

  • 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 oven failure.

  • 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.
  • 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 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 DISASSEMBLY AND ASSEMBLY 3. To remove door parts. PART CODE PART NAME DESCRIPTION Q'TY 3512205230 FRAME DOOR ABS SG-175 SG-0760D 3517005670 BARRIER SCREEN *O TEMP GLASS T3.2 3515204100 STOPPER HINGE *T AS KOR-63150S 3511706120 DOOR PAINTING AS KOR-634R0S 3517002800 BARRIER SCREEN *I PET 0.1 3512300200 GASKET DOOR...
  • Page 13 DISASSEMBLY AND ASSEMBLY 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 stopper hinge top, and then push the door to contact the door seal to oven front surface. Tighten a screw.
  • Page 14 WINDOW DISPLAT PMMA 3516726200 CONTROL-PANEL ABS SG-175 SG-0760D 3516907480 BUTTON FUNCTION ABS SG-175 SG-0760D 3514321440 PCB SUB AS KOR-637V 3514323330 PCB MAIN AS KOR-637V0A 7122401211 SCREW TAPPING T2S TRS 4x12 MFZN 7621301011 SCREW TAPPING T2 PAN 3x10 PW MFZN 3516908520...
  • Page 15 DISASSEMBLY AND ASSEMBLY 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 DISASSEMBLY AND ASSEMBLY 8. To remove wind guide assembly. 1) Remove a screw for earthing. 2) Remove a screw which secure the wind guide assembly. 3) Draw forward the wind guide assembly. 4) Pull the fan from the motor shaft. 5) Remove two screws which secure the motor shaded pole.
  • Page 17 DISASSEMBLY AND ASSEMBLY 10. To remove UV lamp assembly. 1) Remove the screw which secure the UV lamp assembly to the top-plate. 2) Remove the screw which hold the socket starter *O to the cover lamp. 3) Remove the socket starter *O from the cover lamp by pushing up two snap fits. 4) Remove the socket starter *I from the socket starter *O.

  • Page 18: 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. Hook Primary interlock...

  • Page 19: 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 20 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 Continuity supply cord...
  • Page 21 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 22 TROUBLE SHOOTING GUIDE (TROUBLE 4) The following visual conditions indicate a profective 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 23 TROUBLE SHOOTING GUIDE (TROUBLE 5) Press purification button, but oven don't start purifying. CONDITION CHECK RESULT CAUSE REMEDY Adjust or Malfunction of No Continuity No purification Check continuity of replace primary interlock primary interlock switch switch No Continuity Adjust or Malfunction of Check conti nuity of replace...

  • 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

    MEASUREMENT AND 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 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. 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. 1.

  • 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 : 120V / Frequency : 60Hz Terminal Voltage LOAD NO LOAD 4 - 7 AC 12.6 AC 14.7V NOTE...
  • Page 29 PRINTED CIRCUIT BOARD...
  • Page 30 PRINTED CIRCUIT BOARD...
  • Page 31 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. refer to Circuit Diagram (Point 3) - Check method POINT...

  • Page 32: Circuit Diagram

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

  • Page 33: Location No

    PRINTED CIRCUIT BOARD 3. P.C.B. LOCATION NO NAME SYMBOL SPECIFICATION PART CODE Q’ TY BUZZER BM-20K 3515600100 C ARRAY 5P(4) 102M 50V CN4XB-102M C ELECTRO 16V RSS 100uF CEXF1C101V C ELECTRO 25V RSS 1000uF CEXF1E102V CONNECTOR WAFER CN1 YW396-02AV 3519150520 CONNECTOR WAFER CN3 YW396-05AV 3519150510...

  • 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 PART CODE PART NAME DESCRIPTION Q'TY 3511714460 DOOR AS KOR-637V 3516726240 CONTROL PANEL AS KOR-637V0A 3510805300 CABINET AS KOR-61150S 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 3516109590 CAVITY AS KOR-637V0S 7122401211 SCREW TAPPING T2S TRS 4*12 MFZN...
  • Page 36 PART CODE PART NAME DESCRIPTION Q'TY 3513702610 LEVER LOCK 3518571000 SWITCH PUSH MP101C 3513811710 LOCK POM BLACK 3513601500 LAMP BL 120V 25W T25 C5A H187 3512715120 HARNESS MAIN KOR-637V0A FUSE 7121400611 SCREW TAPPING T2S PAN 4X6 MFZN 3966820200 MOTOR SYNCRO 120V 2W GM-16-12F17 3518905300 THERMOSTAT...

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