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  5. Service Manual

Daewoo KOR-1N4A9W Service Manual

Summary of KOR-1N4A9W

  • Page 1

    Service manual microwave oven model: kor-1n4a9w s/m no. : feb. 2013 ✔ 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 cent...

  • Page 2

    1 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 obj...

  • Page 3: Safety and Precautions

    2 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 trai...

  • Page 4: Specifications

    3 specifications power supply 230v ac, 50hz input power 1400 w microwave energy output 1000 w frequency 2450mhz outside dimensions (w h d) 515 x 304 x 375 mm (20.3 x 12.0 x 14.8 in.) cavity dimensions (w h d) 356 x 239 x 358 mm(14.0 x 9.4 x 14.1 in.) cavity volume 1.1 cu.Ft net weight approx. 13.4 k...

  • Page 5: External View

    4 external view 1. Outer dimension 515 mm 375 mm 304 mm.

  • Page 6

    5 1 2 3 4 5 6 7 8 9 0 q w 1 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 2 door seal - the door seal surfaces prevent microwaves escaping from the oven cavity. 3 3 oven cavity 4...

  • Page 7

    6 1 2 5 9 8 7 3 3 4 3 3 6 1 1 display - cooking time, power level, indicators and current time are displayed. 2 2 auto cook - used to cook or reheat many of favorite food. 3 3 one touch - used to cook or reheat specific quantites of food. 4 4 defrost - used to defrost foods for weight and time. 5 5 ...

  • Page 8: Installation

    7 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...

  • Page 9: Operations and Functions

    8 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. Close the door securely. 4. The oven door can be opened at any t...

  • Page 10: Disassembly and Assembly

    9 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 circui...

  • Page 11

    10 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. Note : after replacing the door...

  • Page 12

    11 3. To remove door parts. Door assembly : 3511727410 (1) remove the gasket door from the door painting as. (2) remove the barrier screen*i from the door painting as. (3) remove the door sub as from the door painting as. (4) remove the stopper hinge top from the door painting as. (5) remove the spr...

  • Page 13

    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. • tighten two screws. (2) to reduce gap located on part ‘b’ ...

  • Page 14

    13 5. To remove control panel parts. (1) remove the screw which secure the control panel sub as, push up two snap fits and draw forward the control panel assembly. (2) remove three screws which secure the pcb assembly to the control panel sub as. (3) disconnect membrane tail from the connector of th...

  • Page 15

    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. To remove magnetron. 1) rem...

  • Page 16

    15 9. To remove h.V.Transformer. 1) remove four screws holding the h.V.Transformer. 2) remove the h.V.Transformer. 3) reverse the above steps for reassembly. 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 ...

  • Page 17

    16 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 sw...

  • Page 18: Troubleshooting Guide

    17 (trouble 1) oven does not operate at all ; any inputs can not be accepted. Troubleshooting guide condition check check continuity of interlock monitor switch with door closed check continuity of primary inter-lock switch contact with door partially open until interlock mon-itor switch contact clo...

  • Page 19

    18 condition check check continuity of magnetron defective magnetron result no continuity cause remedy replace outlet has proper voltage fuse does not blow. Check continuity of noise filter board defective magnetron no continuity replace check continuity of power supply cord open power supply cord n...

  • Page 20

    19 (trouble 3) no microwave oscillation even though fan motor rotates. Condition check result check continuity of high voltage capacitor terminals with wires removed continuity cause defective high voltage transformer remedy replace no microwave oscillation check continuity of high voltage fuse repl...

  • Page 21

    20 (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. A distinct cha...

  • Page 22: Measurement and Test

    21 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 ...

  • Page 23

    22 2. Microwave radiation test procedure 1. Prepare microwave energy survey meter, 600cc glass beaker, and glass thermometer 100°c (212°f). 2. Pour 275cc ± 15cc of tap water initially at 20 ± 5°c (68 ± 9°f) in the 600 cc glass beaker with an inside diameter of approx. 95 mm(3.5 in.). 3. Place it at ...

  • Page 24

    23 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 ...

  • Page 25: Wiring Diagram

    24 wiring diagram.

  • Page 26: Printed Circuit Board

    25 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 2. Voltage check - key check point - check method note 1. Refer to circuit diagram. 2. Secondary side vo...

  • Page 27

    26 measure point mp1 gnd mp2.

  • Page 28

    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. 2) when touching start pad, oven lamp turns on. Fan motor and turntable rotate and cook indicator in display comes on. 4. When the d...

  • Page 29

    28 2. Pcb circuit diagram.

  • Page 30

    29 3. Pcb location no. No name symbol specification part code q’ty 1 buzzer bz1 bm-20k 3515600100 1 2 capacitor ceramic c1,2,3,8,9 50v 0.1uf z axial cczf1h104z 5 3 capacitor ceramic c4,5,6,7 50v 1000pf z axial cczb1h102k 4 4 capacitor electro ec1 50v rs 10uf(5x11) cexe1h100a 1 5 capacitor electro ec...

  • Page 31: Exploded View and Parts List

    30 1. Door assembly refer to disassembly and assembly. 2. Control panel assembly refer to disassembly and assembly. 3. Total assembly exploded view and parts list.

  • Page 32

    31 ref no part code part name description q'ty a00 3511727410 door as kor-1n4a9a 1 b00 pkcpswzze0 control-panel as kor-1n4a9w 1 f01 3510810700 cabinet as kor-1n0a9a 1 f02 3516004100 special screw t1 trs lr4 pole 4x10 mfzn 3 f03 3516119600 cavity as kor-1n0a9a 1 f04 3518902600 thermostat off:90 on:60...

  • Page 33

    S/m no. : 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” printed date: feb. 2013.

  • Page 34: About This Manual

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