Daewoo KOR-137B Service Manual
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Daewoo KOR-137B Service Manual

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S/M No. : OR137H9001
Service Manual

Microwave Oven

:
KOR-137B
Model
KOR-137H
• 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).
Dic. 2007

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  • Page 1: Microwave Oven

    S/M No. : OR137H9001 Service Manual Microwave Oven KOR-137B Model KOR-137H • 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 CAUTION : This Device is to be Serviced Only by Properly Qualified Service Personnel. Consult the Service Manual for Proper Service Procedures to Assure Continued Safety Operation and for Precautions to be Taken to Avoid Possible Exposure to Excessive Microwave Energy. 1.

  • Page 4: Specifications

    SPECIFICATIONS POWER SUPPLY 120V AC, 60Hz SINGLE PHASE WITH GROUNDING INPUT POWER 1400 W MICROWAVE ENERGY OUTPUT 1000 W FREQUENCY 2,450MHz OUTSIDE DIMENSIONS (W 563 x 318 x 420 mm (22.2 x 12.5 x 16.5 in.) CAVITY DIMENSIONS (W 380 x 246 x 386 mm (15.0 x 9.7 x 15.2 in.) CAVITY VOLUME 1.3 cu.ft NET WEIGHT...

  • Page 5: Features Diagram

    2. FEATURES DIAGRAM 5 6 7 1 Door latch - When the door is closed, it will 7 Safety interlock system automatically shut off. If the door is opened while the 8 Control panel oven is operating, the magnetron will automatically shut off.

  • Page 6: Control Panel

    3. CONTROL PANEL 1 Display - Cooking time, power level, indicators and 7 Stop/Clear - Used to stop the oven operation or to current time are displayed. delete the cooking data. 2 One touch - Used to cook or reheat specific quantities 8 Defrost - Used to defrost foods.

  • Page 7: Installation

    INSTALLATION 1. Steady, flat location. This microwave oven should be set on a steady, flat surface. 2. Leave space behind and side. All air vents should be kept a clearance. If all vents are covered during operation, the oven may be overheated and, eventually, cause oven failure.

  • Page 8: Operations And Functions

    OPERATIONS AND FUNCTIONS 1. Connect the mains 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 9: 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 10 1. To remove cabinet 1) Remove four 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 11 3. To remove door parts. REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK 3517009920 BARRIER SCREEN *O SAN T1.5 3511718720 FRAME DOOR KOR-137H9A27 SILICON 3515202900 STOPPER HING *T AS KOR-121M0A 3511713600 DOOR PAINTING AS KOR-131G0A 3517006400 BARRIER SCREEN *I PE T1.0 3512302200 GASKET DOOR...
  • Page 12 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 13 5. To remove control panel parts. REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK 3516908910 BUTTON DOOR OPEN ABS SG-0760K, SG-175 441G430171 SPRING BUTTON SWP DIA. 0.7 3518523120 SWITCH MEMBRANE KOR-137H9A27 3516733210 CONTROL PANEL ABS SG-0760D, SG-175 3513702310 LEVER DOOR OPEN PKMPMSKN50 PCB MAIN MANUAL AS KOR-137H9A27...
  • Page 14 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 15 8. To remove wind guide assembly. 1) Remove the screw for earthing. 2) Remove the noise filter from the wind guide. 3) Remove the screw which secure the wind guide assembly. 4) Draw forward the wind guide assembly. 5) Pull the fan from the motor shaft. 6) Remove two screws which secure the motor shaded pole.

  • Page 16: 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 17: 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 18 CONDITION CHECK RESULT CAUSE REMEDY Replace Defective Outlet has Check continuity of magnetron Continuity magnetron proper voltage Fuse does not Replace blow. Open power Check continuity of Continuity supply cord power supply cord Replace Normal Defective touch control circuit Replace Display do not shown Malfunction of countdown...
  • Page 19 (TROUBLE 3) No microwave oscillation even though fan motor rotates. CONDITION CHECK RESULT CAUSE REMEDY Continuity Replace Check continuity of high Defective high microwave voltage capacitor terminals voltage oscillation with wires removed transformer Continuity in Replace Check continuity of high voltage Defective high backward rectifier in forward and backward...
  • Page 20 (TROUBLE 4) The following visual conditions indicate a probable defective touch control circuit 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 21: 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 22: 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 23: 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 24: Wiring Diagram

    WIRING DIAGRAM...

  • Page 25: Printed Circuit Board

    PRINTED CIRCUIT BOARD KOR-137B/H 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 5-6-7 AC 12.6 V AC 14.7 V NOTE 1.
  • Page 26 Measurement point...
  • Page 27 3. When there is no microwave oscillation 1) When touching START pad, oven lamp does not turn on. Fan motor does not rotate, but cook indicator in display comes on. (TRAY LAMP) - Check method POINT STATE RELAY 2 ON 5VDC RELAY 2 OFF 12VDC...

  • Page 28: Pcb Circuit Diagram

    2. PCB CIRCUIT DIAGRAM...

  • Page 29: Pcb Location No

    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). 3. PCB LOCATION NO. NAME SYMBOL SPECIFICATION...

  • Page 30: 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 31 REF NO. PART CODE PART NAME DESCRIPTION Q'TY 3511713530 DOOR AS KOR-137H9A27 PKCPSWKN70 CONTROL-PANEL AS KOR-137H9A27 3510806600 CABINET AS KOR-131G0S BLACK 3510807301 CABINET AS STS430 NO4 STEEL 3516111500 CAVITY AS KOR-131G0A 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 7112401011 SCREW TAPPING...
  • Page 32 DAEWOO ELECTRONICS CORP. 686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX: DWELEC K28177-8 CABLE: “DAEWOOELEC” S/M NO. : PRINTED DATE: Apr. 2007...

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Kor-137h

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