DAEWOO ELECTRONICS KOR-634R Service Manual
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DAEWOO ELECTRONICS KOR-634R Service Manual

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Service Manual
Microwave Oven
Model : KOR-634R
DAEWOO ELECTRONICS CO., LTD.
http://svc.dwe.co.kr
36

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Summary of Contents for DAEWOO ELECTRONICS KOR-634R

  • Page 1 Service Manual Microwave Oven Model : KOR-634R DAEWOO ELECTRONICS CO., LTD. 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 MODEL KOR-634R POWER SUPPLY 230V~50Hz, SINGLE PHASE WITH EARTHING POWER CONSUMPTION MICROWAVE 1,200 W 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) 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...

  • Page 6: Feature Diagram

    2. FEATURE DIAGRAM 1. DOOR SEAL 5. OVEN LAMP Door seal maintains the microwave within the oven Automatically turns on during oven operating. cavity and prevents microwave leakage. 6. SAFETY INTERLOCK SYSTEM 2. DOOR HOOK 7. CONTROL PANEL When the door is closed, it will automatically lock shut. 8.

  • Page 7: Control Panel

    3. CONTROL PANEL KOR-634R 1. Display — Cooking time, power level, indicators and 6. Dial knob — Used to set time and weight. present time are displayed. 7. Stop/Clear — Used to stop the oven operation or to 2. Power — Used to set power level.

  • 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. 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 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. KOR-634R DOOR ASSEMBLY KOR-634R0S : 3511712140 REF NO. PART CODE PART NAME DESCRIPTION Q TY REMARK 3512203850 FRAME DOOR ABS XR-401, H-2938 3517005620 BARRIER-SCREEN*O TEMP GLASS T3.2 3515204100 STOPPER HINGE*T AS KOR-63150S 3511706120 DOOR PAINTING AS...
  • Page 13 (1) Remove the gasket door from door weld as. (2) Remove the barrier screen inner from 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. (6) Remove the barrier screen outer from door frame.
  • Page 14 5. To remove control panel parts. KOR-634R CONTROL PANEL ASSEMBLY KOR-634R0S : PKCPSWZYOO REF NO. PART CODE PART NAME DESCRIPTION Q TY REMARK 3513404620 KNOB VOLUME ABS XR-401, H-2938 3511604510 DECORATOR C-PANEL STS T0.6 3516003910 SPECIAL DOUBLE TAPE SI-161 T0.15...
  • 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. N 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: 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 18: 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 19 Condition Check Result Cause Remedy Outlet has Check continuity of Defective magnetron Replace proper voltage. magnetron Continuity Fuse does not blow. Defective line filter Check continuity of Replace Continuity board noise filter board Open power supply Check continuity of Replace cord Continuity power supply cord...
  • Page 20 (TROUBLE 3) No microwave oscillation even though fan motor rotates. Condition Check Result Cause Remedy Check continuity Continuity Defective high Replace microwave of high voltage voltage oscillation capacitor transformer terminals with wires removed Check continuity of Continuity in Defective high Replace high voltage rectifi- voltage rectifier...
  • Page 21 (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 22: 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 23: 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 24: 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 25: Wiring Diagram

    WIRING DIAGRAM...

  • Page 26: 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 27 Measure Point...
  • Page 28 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 STATE...

  • Page 29: Pcb Circuit Diagram

    2. PCB CIRCUIT DIAGRAM...

  • Page 30: Location No

    3. P.C.B. LOCATION NO. NAME NAME SYMBOL SPECIFICATION PART CODE Q’TY REMARK PCB MAIN M166 82 X 146.8 3514321140 MAIN PCB BUZZER BM-20K 3515600100 C ARRAY 5P(4) 1000PF M 50V CN4XB-102M CAPACITOR CERA 102 50V Z AXIAL CCZB1H102K CAPACITOR CERA C1~5, C7 104 50V Z AXIAL CCZF1H104Z...

  • Page 31: 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 32 NAME PART CODE PART NAME DESCRIPTION Q’TY DOOR AS Refer to disassembly and assembly CONTROL PANEL AS Refer to disassembly and assembly 3510801310 CABINET PCM T0.36 GE 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 3516109000 CAVITY WELD AS CAVITY WELD AS 3516109600 CAVITY JOINT AS CAVITY JOINT AS...

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