Daewoo KOR-1N4A9W Service Manual
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Daewoo KOR-1N4A9W Service Manual

Daewoo KOR-1N4A9W Service Manual

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S/M No. :
Service Manual

Microwave Oven

Model: KOR-1N4A9W
✔
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).
R1N4A9W001
Feb. 2013

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Summary of Contents for Daewoo KOR-1N4A9W

  • Page 1: Microwave Oven

    R1N4A9W001 S/M No. : Service Manual Microwave Oven Model: KOR-1N4A9W ✔ 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 AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY (a) Do not attempt to operate this oven with the door open since open-door operation can result in harmful exposure to microwave energy. It is important not to defeat or tamper with the safety interlocks. (b) Do not place any object between the oven front face and the door or allow soil or cleaner residue to accumulate on sealing surfaces.

  • 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 POWER SUPPLY 230V AC, 50Hz INPUT POWER 1400 W MICROWAVE ENERGY OUTPUT 1000 W FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W 515 x 304 x 375 mm (20.3 x 12.0 x 14.8 in.) CAVITY DIMENSIONS (W 356 x 239 x 358 mm(14.0 x 9.4 x 14.1 in.) CAVITY VOLUME 1.1 cu.ft NET WEIGHT...

  • Page 5: External View

    EXTERNAL VIEW 1. OUTER DIMENSION 515 mm 375 mm...

  • Page 6: Features Diagram

    2. FEATURES DIAGRAM 1 Door latch - When the door is closed, it will automatically shut off. If the door is opened while the oven is operating, the magnetron will automatically shut off. 2 Door seal - The door seal surfaces prevent microwaves escaping from the oven cavity. 3 Oven cavity 4 Oven lamp - Automatically turns on during oven operating.

  • Page 7: Control Panel

    3. CONTROL PANEL 1 DISPLAY - Cooking time, power level, indicators and current time are displayed. 2 AUTO COOK - Used to cook or reheat many of favorite food. 3 ONE TOUCH - Used to cook or reheat specific quantites of food. 4 DEFROST - Used to defrost foods for weight and time.

  • Page 8: Installation

    • 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 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 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 safe during normal operation. However, carelessness in servicing the oven can result in an electric shock or possible danger from a short circuit.
  • 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. DOOR ASSEMBLY : 3511727410 REF. NO PART CODE PART NAME DESCRIPTION Q'TY REMARK 3517010500 BARRIER-SCREEN*O SAN T1.5 SMOG 3511727200 DOOR SUB AS KOR-1N4A9A 3515204120 STOPPER HINGE*T AS KOR-6L0B1A 3511727500 DOOR PAINTING AS KOR-1N0A9A 3517006000 BARRIER-SCREEN*I PE T1.0 3512301330 GASKET DOOR...
  • 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 the stopper hinge top, and then push the door to contact the door seal to the oven front surface.
  • Page 14 REMARK 3518510100 SWITCH MEMBRANE KOR-1N4A9S 3513005100 HOLDER LED 3516738200 CONTROL-PANEL SUB AS KOR-1N4A9A PKMPMSZZB0 PCB MAIN AS KOR-1N4A9W 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 3513702710 LEVER DOOR OPEN 441G430171 SPRING BUTTON SWP DIA. 0.7 3516915850 BUTTON DOOR OPEN ABS SG-0760D, SG-175 COATING (1) Remove the screw which secure the control panel sub as, push up two snap fits and draw forward the control panel assembly.
  • Page 15 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. ◆...
  • Page 16 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 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: 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 19 CONDITION CHECK RESULT CAUSE REMEDY Replace Defective Outlet has Check continuity of magnetron Continuity magnetron proper voltage Fuse does not Replace Defective blow. Check continuity of Continuity noise filter board magnetron Replace Check continuity of Open power Continuity supply cord power supply cord Replace Normal...
  • Page 20 (TROUBLE 3) No microwave oscillation even though fan motor rotates. CONDITION CHECK RESULT CAUSE REMEDY Continuity microwave Check continuity of high oscillation voltage fuse Replace high voltage fuse Continuity Replace Check continuity of high Defective high voltage capacitor terminals voltage with wires removed transformer Continuity in...
  • Page 21 (TROUBLE 4) The following visual conditions indicate a probable defective touch control circuit 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. A cylindrical container of borosilicate glass is used for the test. It has a maximum thickness of 3mm, an external diameter of approximately 190mm and a height of approximately 90mm.

  • 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 (4,5) -6 or (7, 8) -6 DC 12V AC 30 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 does not rotate, but cook indicator in display comes on. - Check method POINT STATE RELAY 2 ON 5V DC RELAY 2 OFF 15V DC 2) When touching START pad, oven lamp turns on.

  • Page 29: Pcb Circuit Diagram

    2. PCB CIRCUIT DIAGRAM...

  • Page 30: Pcb Location No

    3. PCB LOCATION NO. NAME SYMBOL SPECIFICATION PART CODE Q’TY BUZZER BM-20K 3515600100 CAPACITOR CERAMIC C1,2,3,8,9 50V 0.1UF Z AXIAL CCZF1H104Z CAPACITOR CERAMIC C4,5,6,7 50V 1000PF Z AXIAL CCZB1H102K CAPACITOR ELECTRO 50V RS 10UF(5X11) CEXE1H100A CAPACITOR ELECTRO 25V RSS 1000UF(13X20) CEXF1E102V CONNECTOR WAFER FCZ254-9...

  • 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 REF NO PART CODE PART NAME DESCRIPTION Q'TY 3511727410 DOOR AS KOR-1N4A9A PKCPSWZZE0 CONTROL-PANEL AS KOR-1N4A9W 3510810700 CABINET AS KOR-1N0A9A 3516004100 SPECIAL SCREW T1 TRS LR4 POLE 4X10 MFZN 3516119600 CAVITY AS KOR-1N0A9A 3518902600 THERMOSTAT OFF:90 ON:60 H #187 7121300611...
  • Page 33 DAEWOO ELECTRONICS CORP. 1-2, Jeo-dong 1(il)-ga, Jung-gu, Seoul, Korea C.P.O. BOX 8003 SEOUL, KOREA TELEX: DWELEC K28177-8 CABLE: “DAEWOOELEC” S/M NO. : PRINTED DATE: Feb. 2013...
  • Page 34 ABOUT THIS MANUAL ABOUT THIS MANUAL...

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