Daewoo KOR-1A8Q0A Service Manual
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Daewoo KOR-1A8Q0A Service Manual

Daewoo KOR-1A8Q0A Service Manual

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Service Manual

Microwave Oven

Model: KOR-1A8Q0A
KOR-1A8Q1A
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).
DAEWOO ELECTRONICS CORP.
http : //svc.dwe.co.kr
S/M No. : R1A8Q1A002
Aug. 2004

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Summary of Contents for Daewoo KOR-1A8Q0A

  • Page 1: Microwave Oven

    S/M No. : R1A8Q1A002 Service Manual Microwave Oven Model: KOR-1A8Q0A KOR-1A8Q1A 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 Personel. 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 MODEL KOR-1A8Q POWER SUPPLY 120V~60Hz, SINGLE PHASE WITH GROUNDING MICROWAVE 1400W POWER GRILL CONSUMPTION COMBINATION MICROWAVE ENERGY OUTPUT 1000W MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 539x300x405 mm (21.2x11.8x16.0 in) CAVITY DIMENSIONS (W X H X D) 354x228x373 mm (13.9x9.0x14.7 in) NET WEIGHT Approx.

  • Page 5: External View

    EXTERNAL VIEW 1. OUTER DIMENSION...

  • Page 6: Feature Diagram

    2. FEATURE DIAGRAM 1. DOOR SEAL Door seal maintains the microwave within the oven cavity and prevents microwave leakage. 2. DOOR HOOK When the door is closed, it will automatically lock shut. If door is opened while oven is operating, magnetron tube will immediately stop operating.

  • Page 7: Control Panel

    3. CONTROL PANEL - KOR-1A8Q AUTO STAGE DEFROST START WEI GHT TI ME LOCK NO CUPS OZ Ib POPCORN SOUP MUPPI N BAKED DI NNER PROZEN POTATO PI ZZA PI ZZA PRESA VEGETABLE MORE LESS BEVER AGE Qui ck cook AUTO DEF.

  • Page 8: 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 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 Caution In this Service 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. To remove door parts. REF NO.
  • 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 stopper hinge top, and then push the door to contact the door seal to oven front surface.
  • Page 14 So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr). 5. To remove control panel parts. REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK 3518570980 SWITCH MEMBRANE KOR-1A8Q0A 3516722310 CONTROL-PANEL ABS AF-345,HFA-700HT 3514321900 PCB AS KOR-1A8Q0A 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 3513702800...
  • 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. 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 Replace Defective mag- Outlet has Check continuity of magnetron Continuity netron proper volt- age Fuse does not Replace blow. Open power sup- Check continuity of Continuity ply cord power supply cord Replace Normal Defective touch control circuit Replace Display do not shown...
  • Page 20 (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 trans- oscillation with wires removed former Continuity in Replace Check continuity of high voltage Defective high backward rectifier in forward and backward...
  • 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. ST AGE DEF ROST AUTO...

  • 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

    1) KOR-1A8Q0A...
  • Page 26 2) KOR-1A8Q1A...

  • Page 27: Printed Circuit Board

    PRINTED CIRCUIT BOARD 1. CIRCUIT CHECK PROCEDURE 1. Low Voltage Transformer (DMR-602P) check • The low voltage transformer is located on the P.C.B. • Measuring condition: input voltage : 120V/Frequency : 60Hz Terminal Voltage LOAD NO LOAD AC 12.6 V AC 14.7 V NOTE : Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source voltage...
  • Page 28 Bottom View...

  • Page 29: Top View

    3. Display problems CAUSE MEASUREMENT RESULT REMEDY Defective Display Refer to “The display trouble Replace P.C.B. assembly shooting data”bellow. Display layout (Top View) - The display trouble shooting data TROUBLE DISPLAY NAME & PIN NO. MICOM OUTPUT IN PIN NO. STAGE 1, LOCK DON”T COME ON.
  • Page 30 - Check method POINT STATE RELAY 2 ON RELAY 2 OFF +12VDC 2) When touching START pad, oven lamp turns on. Fan motor and turntable rotate and cook indicator in display comes on. * Cause : RELAY 1 does not operate. 1N4002A KRC106M MGT RY...
  • Page 31 6. When the digital clock does not operate properly. 1N148M LVT1 EXINT 5.1V 4.7K POINT WAVE FORM 4.3V T : 20ms(50Hz) 16.67ms(60Hz) If clock does not keep exact time, you must check resistor R15,16, zener diodeZD1.

  • Page 32: Pcb Circuit Diagram

    2. PCB CIRCUIT DIAGRAM...

  • Page 33: Component Information

    3. COMPONENT INFORMATION 1) Transistor Emitter Collector Base 2) Diode and Zener Diode DIODE Cathode (K) ANODE (A) D1-D6, D8-D14 ZENER Cathode (K) ANODE (A) ZD1,ZD2 DIODE 3) Digital Transistor * Internal circuit Q1-Q8 Collector Q11-Q13 BASE Emitter RESISTOR TYPE KRC106M 4.7K Emitter...

  • Page 34: Printed Circuit Board

    4. PRINTED CIRCUIT BOARD...

  • Page 35: Location No

    Caution In this Service 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). 5. P.C.B. LOCATION NO. PART NAME REF NO.

  • Page 36: 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 1) KOR-1A8Q0A...
  • Page 37 In this Service 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). 1) KOR-1A8Q0A REF NO PART CODE...
  • Page 38 2) KOR-1A8Q1A...
  • Page 39 So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr). 2) KOR-1A8Q1A REF NO PART CODE PART NAME DESCRIPTION Q'TY 3511711210 DOOR AS KOR-1A8Q0A PKCPSWL900 CONTROL-PANEL AS KOR-1A8Q0A 3510805500 CABINET AS KOR-1A1G0A LOUVER 7112401011 SCRW TAPPING T1 TRS 4*10 MFZN...
  • Page 40 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. : R1A8Q1A002...

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