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Daewoo KOR-145M0P Service Manual - Specifications

Summary of KOR-145M0P

  • Page 1

    Service manual microwave oven model: kor-145m0p kor-145q0p daewoo electronics co., ltd. ✔ 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 servi...

  • Page 2

    2 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- w...

  • Page 3

    3 proper use and service 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 e...

  • Page 4: Specifications

    4 specifications power supply 220v~60hz, single phase with earthing power consumption 1350 w microwave output power 900 w (iec 705) frequency 2450 mhz outside dimensions (w x h x d) 560 x 360 x 396 mm (22 x 14.2 x 15.6 in.) cavity dimensions (w x h x d) 382 x 270 x 360 mm (15.0 x 10.6 x 14.2 in.) ne...

  • Page 5: Features Diagram (Kor-145M)

    5 features diagram (kor-145m) less 5 0 1. Baked potato 2. Fresh vegetable 3. Soup 4. Fish fillets 5. Meat loaf auto cook menu popcorn muffin more less beverage speedy cook frozen pizza dinner plate weight 1 stage 2 weight time auto start defrost lock no cups g stop/clear start auto defrost clock / a...

  • Page 6: Features Diagram (Kor-145Q)

    6 features diagram (kor-145q) 1 2 3 4 5 6 9 7 11 15 13 21 12 14 22 16 23 24 26 18 17 19 20 10 25 27 8 auto def. Speedy cook popcorn soup muffin beverage baked potato frozen pizza dinner plate fresh vegetable 1 stage 2 weight time auto start defrost lock no cups g stop/ clear start 1 2 3 4 5 6 7 8 0 ...

  • Page 7: Earthing Instructions

    7 earthing instructions this appliance must be earthed. In the event of an electrical short circuit, earthing reduces the risk of electric shock by providing an escape, wire for the electric current. This appliance is equipped with a cord having a earthing wire with a earthing plug. The plug must be...

  • Page 8: Operation Procedure

    8 this section includes useful information about oven operation. 1. Plug power supply cord into a 230v 50hz power 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. Shut the door. Make ...

  • Page 9: Controls

    9 when the oven is first plugged in, the display will flash “ :0” and a tone will sound. If the ac power ever goes off, the display will flash “ :0” when the power comes back on. Controls setting the clock do this... 1. Touch clock/a.Start pad. 2. Touch clock/a.Start pad once more. 3. Enter the corr...

  • Page 10

    10 weight defrost lets you easily defrost food by eliminating guesswork in determining defrosting time. The minimum weight for weight defrost is 200 grams. The maximum weight for weight defrost is 3000 grams. Follow the steps below for easy defrosting. Weight defrosting do this... 1. Touch auto defr...

  • Page 11

    11 when time defrost is selected, the automatic cycle divides the defrosting time into periods of alternating defrost and stand times by cycling on and off. Do this... 1. Touch auto defrost pad. 2. Touch auto defrost pad once more. 3. Touch number pads for the defrosting time you want. 4. Touch star...

  • Page 12

    12 do this... 1. Touch power pad. 2. Touch the number pad for the power level you want. 3. Touch number pads for the cooking time. 4. Touch start pad. This happens... The stage1 indicator lights and “p-” is displayed. The display will show what you touched. This example shows power level 3. The disp...

  • Page 13

    13 for best results, some recipes call for one power level for a certain length of time and another power level for a different length of time. Your microwave oven can be set to change from one to another. Do this... 1. Touch number pads for the cooking time you want in the first stage. 2. Touch pow...

  • Page 14

    14 some recipes require frozen foods to be thawed before cooking. This oven can be programmed to automatically defrost foods before cooking. Do this... 1. Touch auto defrost pad. 2. Touch number pads for the defrosting weight you want. 3. Touch power pad. 4. Touch power pad once more. 5. Touch numbe...

  • Page 15

    15 do this... 6. Touch power pad. 7. Touch the number pads for the power level you want in the second stage. 8. Touch the number pads for the cooking time you want in the second stage. 9. Touch start pad. This happens... The stage2 indicator lights and “p-” is displayed. The display will show what y...

  • Page 16

    16 allows you to program cooking to start at a time you select. The food will automatically start cooking at the desired time. Program is able up to 2 stages (not acceptable defrost) do this... 2. Touch clock/a.Start pad. 3. Enter the desired start time by pressing the number pads. 4. Touch start pa...

  • Page 17

    17 once you have correctly programmed the oven for auto start, the present time will appear on the display. Speedy cook, allows you to reheat for 30 seconds at 100% (full power) by simply touching the speedy cook pad. By repeatedly touching the speedy cook pad, you can also extend reheating time to ...

  • Page 18

    18 one touch cook allows you to cook or reheat many of your favorite foods by touching just one pad. To increase quantity, touch chosen pad until number in display is same as desired quantity to cook. (except for muffin & dinner plate) one touch cooking do this... 1. Touch popcorn pad. This happens....

  • Page 19

    19 do this... 1. Touch beverage pad. This happens... When you touch beverage pad, “1” is displayed. After 1.5 seconds, the display changed into cooking time of quantity and the oven starts cooking. Beverage stage defrost 1 2 weight time auto start lock no cups g * frozen pizza* • 200g : touch frozen...

  • Page 20

    20 do this... 1. Touch muffin pad. This happens... When you touch muffin pad, “5” is displayed. After the 1.5 seconds, the display changed into cooking time of quantity and the oven starts cooking. Muffin stage defrost 1 2 weight time auto start lock no cups g note : for best results, consult the co...

  • Page 21

    21 do this... 1. Touch baked potato pad. This happens... When you touch baked potato pad, “1” is displayed. After 1.5 secodns, the display changed into cooking time of quantity and the oven starts cooking. Baked potato stage defrost 1 2 weight time auto start lock no cups g * fresh vegetable * • 200...

  • Page 22

    22 auto cook allows you to cook or reheat many of your favorite foods by repeatedly touching menu pad. After the menu selection, touch chosen pad until number in display is same as desired quantity to cook. Do this... 1. Touch menu pad. 2. Touch weight pad. This happens... When you touch menu pad, “...

  • Page 23

    23 more pad : increase for 10 seconds to 20 seconds. Less pad : decrease for 10 seconds to 20 seconds. These pads only work one touch cooking mode. And always input previously. The safety lock prevents unwanted oven operation such as by small children. To set, press stop/clear for 3 seconds, lock in...

  • Page 24

    24 the door lock mechanism is a device 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 o...

  • Page 25

    25 (2) secondary interlock switch, interlock monitor switch when the door is closed, the hook pushes the push lever downward, the push lever presses the button of the secondary interlock switch and door open monitor switch to bring it under “no” condition the hook presses the button of interlock mon...

  • Page 26: Microwave Emission Test

    26 measurement of the microwave output power 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 v...

  • Page 27: Wiring Diagram

    27 - measuring should be in a counter-clockwise direction at a rate of 1 inch/sec. If the leakage of the cabinet door seam is unknown, move the probe more slowly. - when measuring near a corner of the door, keep the probe perpendicular to the areas making sure the probe end at the base of the cone d...

  • Page 28: Circuit Description

    28 refer to the “wiring diagram” microwave cooking time cooking 1. When the food is placed inside the oven and door is closed. 1) the low voltage transformer supplies the necessary voltage to the touch control circuit when the power cord is plugged in. 2) the contacts of the interlock monitor switch...

  • Page 29

    29 the touch control circuit controls the on-off time of relay “1” in order to vary the output power of the microwave oven from “power level 1” to “hi (100%) power”. One complete on and off cycle of the relay “1” is 29 seconds. The relation between indications on the control panel and the output of ...

  • Page 30

    30 fig. 3 auto defrost cycle when auto defrost is selected and the desired defrosting time is chosen, the automatic cycle divides the defrosting time into 5 periods of alternating defrost and stand times, by cycling on and off. 4. When the door is opened during cooking. 1) the primary interlock swit...

  • Page 31

    31 - cautions to be observed when trouble shooting. Unlike many other appliances, the microwave oven is a 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...

  • Page 32: Disassembly and Assembly

    32 1. To remove cabinet. Remove four screws from the rear section and push the cabinet backward. 2. To remove door assembly. (1) remove three bolts 1 and nuts 2 which secure top hinge and under hinge stopper, respectively. (2) remove the top hinge stopper 4 and under hinge stopper 5 . (3) remove doo...

  • Page 33

    33 (1) remove the out plate 5 and door frame 6 . (2) remove the microwave absorber 2 and film 1 . (3) remove a spring 7 and hook 3 . (4) reverse the above steps for reassembly. 4. Method to reduce the gap between the door seal and the oven front surface. (1) to reduce gap located on part “a” 1) loos...

  • Page 34

    34 5. To remove control panel assembly. (1) disconnect two connector and terminals on the printed circuit board assembly and remove a screw 0 holding the grounding ring terminal 9 of main harness, which secured front plate. (2) remove two screws holding control panel assembly to the oven front. At t...

  • Page 35

    35 6. To remove high voltage capacitor. (1) remove two screws 1 which secure the grounding ring terminal 2 of diode and capacitor holder 3 . (2) remove capacitor holder 3 with capacitor 4 . (3) reverse the above steps for reassembly. High voltage circuit wiring 7. To remove magnetron. (1) remove a s...

  • Page 36

    36 8. To remove fan motor assembly and guide wind. (1) remove screws 1 . (2) remove guide wind assy (3) remove fan. (4) remove two screws 4 holding the fan motor 5 . (5) remove guide wind 2 . (6) reverse the above for reassembly. 9. To remove transformer. (1) remove four tapping screws 1 . (2) remov...

  • Page 37

    37 10.Replacement of the tray motor. (1) cut the tray motor cover from the base plate. (2) disconnect two terminal wires from the tray motor. (3) remove two screws 2 holding the tray motor. (4) to install a new tray motor reverse the above steps..

  • Page 38: Trouble Shooting Guide

    38 following the procedures below to check if the oven is defective or not. 1. Check grounding before checking trouble. 2. Be careful of the high voltage circuit. 3. Discharge the high voltage capacitor. 4. When checking the continuity of switches or of the high voltage transformer, disconnect one l...

  • Page 39

    39 (trouble 2) digital readout display does not show programming, even if the membrane keyboard is programmed by touching proper pads. 1. Check the pad termination and pcb connector order. (kor-145m) condition check result cause remedy replace control box sub- assembly replace the membrane keyboard ...

  • Page 40

    40 kor-145q a b c d e f g h i j k pad termination 1 2 3 4 5 6 7 8 9 10 11 pcb connection auto def. Speedy cook popcorn soup muffin beverage baked potato frozen pizza dinner plate fresh vegetable 1 stage 2 weight time auto start defrost lock no cups g stop/ clear start 1 2 3 4 5 6 7 8 0 9 power clock...

  • Page 41

    41 2. Type of encoding and pad names. (kor-145q) fig. 8 key matrix the membrane keyboard consists of 26 keys whose configurations are described above and provide 11 pad terminations to be connected to the touch control circuit as fig. 7. Key check procedure. To determine if the membrane keyboard is ...

  • Page 42

    42 kor-145m fig. 8 key matrix the membrane keyboard consists of 25 keys whose configurations are described above and provide 11 pad terminations to be connected to the touch control circuit as fig. 7. Key check procedure to determine if the membrane keyboard is defective or not, check the continuity...

  • Page 43

    43 (trouble 3) oven does not operate at all; display window does not display any figures and any inputs can not be accepted. Condition 15a fuse blows check result casue remedy replace primary interlock switch and monitor interlock switch. Check continuity interlock monitor switch with door closed. C...

  • Page 44

    44 (trouble 4) display shows all figures selected, but oven does not start cooking, even though desired program and time are set and start pad is tapped. Condition check result cause remedy replace outlet has proper voltage. Fuse does not open. Check continuity of magnetron thermostat no continuity ...

  • Page 45

    45 (trouble 5) no microwave oscillation even though fan motor rotates. Condition check result cause remedy no microwave oscillation check continuity of connecting wire of magnetron no continuity continuity defective magnetron replace check continuity of filament terminal of high voltage transformer ...

  • Page 46

    46 (trouble 6) microwave output power is low. First of all, check if output power is really low following “measurement of the microwave output power” on page 26. Condition check result cause remedy output power is low. Check the power source voltage with magnetron oscillating lower than 207 volts no...

  • Page 47: Component Test Procedure

    47 1. High voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle. 2. It is neither necessary nor advisable to attempt measurement of the high voltage. 3. Before touching any oven components or wiring, always unplug the oven from its power source and...

  • Page 48

    48 safety interlock continuity test • disconnect the oven from the power supply. • you can test continuity of safety interlocks and monitor switch by using switch tester or ohmmeter. • the switch operation is checked by the lamp on/off of resistance zero/unlimited. • the sequence of check is interlo...

  • Page 49: Printed Circuit Board

    49 1. Circuit check procedure 1) low voltage transformer (dmr-604fs) check. The low voltage transformer is located on the p.C.B. Measuring condition : input voltage ; 220v measuring condition : frequency ; 60hz 2) voltage check key check point check method printed circuit board 1 10 8 7 6 2 voltage ...

  • Page 50

    50 3) display problems display touble shooting data 4) when there is no microwave oscillation. (1) when touching start pad, oven lamp does not turn on. Fan motor and truntable motor do not rotate, but cook indicator in display comes on. * cause : relay “2” does not operate. No. Cause measurement res...

  • Page 51

    51 mp-1 mp-3 mp-2 fig 3. Measurement point.

  • Page 52

    52 check method (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. Check method 5) when the door is opened during operation, the count down timer does not stop. Check method point a stage rel...

  • Page 53

    53 6) when the digital clock does not operate properly. If clock does not keep exact time, you must check resistor r17, r11. D11 d12 d14 d13 r17 r11 c4 22 ic1 a point waveform a 0v -14v t ; 16.67 ms.

  • Page 54

    54 2. Pcb circuit diagram baked potato, fresh vegetable, soup : kor-145qos only weight, menu : kor-145mos only.

  • Page 55

    55 3. Component information transistor diode and zener diode emitter collector q 1, 3-5 base diode cathode (k) zener diode cathode (k) anode (a) d1-7, 9-14 anode (a) zd 1-3.

  • Page 56

    56 4. Printed circuits board.

  • Page 57

    57 5. P.C.B location no. No name symbol specification part code q’ty 1 resistor r10, 13, 18 4.7k Ω , 1/6w, 5% rd-az472j- 3 2 resistor r3 200 Ω , 1/6w, 5% rd-az201j- 1 3 resistor r5,8 20k Ω , 1/6w, 5% rd-az203j- 2 4 resistor r1 1m Ω , 1/6w, 5% rd-az105j- 1 5 resistor r2, 4, 6, 9, 15, 20 1k Ω , 1/6w, ...

  • Page 58: Exploded and Parts List

    58 exploded and parts list 1. Door assembly 3 7 6 5 4 2 1 door as : 3511706700 ref.No part code part name description q’ty remarks a1 4415b40071 barrier-screen *i kor-110, 920series 1 a2 3510100800 absorber micro pp + ferrite 1 a3 3513100500 hook acetal 1 a4 3511706800 door painting as kor-145m0a 1 ...

  • Page 59

    59 2. Control panel assembly 1 2 3 4 5 6 ref.No part code part name description q’ty remarks b1 3518510500 switch membrane kor-145m0a 1 kor-145m 3518510600 kor-145q0a kor-145q b2 3516711700 control panel abs 1 b3 pkmpmsme00 pcb main as kor-145m0p, 145q0p 1 b4 3513701700 lever door open acetal duraco...

  • Page 60: Exploded View

    Exploded view 60 27 26 25 24 28 29 1 2 3 4 8 7 9 10 30 11 16 15 14 17 18 19 21 22 23 6 5 34 a00 b00 32 36 31 35.

  • Page 61

    61 no. Part code part name description q’ty remarks f1 3510801200 cabinet pcm 1 f2 3963324000 motor shaded pole oem-15dwb1-b03 220v 30w 1 f3 3512510700 guide wind p.P 1 f4 3511800100 fan p.P gf20 1 f5 3518002200 magentron 2m218h(mf) i 1 f6 3518902700 thermostat 130/115˚c #187 1 f7 4415u23010 capacit...

  • Page 62

    S/m no. : r145m0p001 daewoo electronics co., ltd. 686, ahyeon-dong mapo-gu seoul, korea c.P.O. Box 8003 seoul, korea telex: dwelec k28177-8 cable: “daewooelec” fax: 02) 360-8184 tel: 02) 360-8183 http://www.Dwe. Daewoo.Co.Kr printed date: sep. 1998.