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Daewoo KOC-1B4K0S Service Manual - 3. External View

Other manuals for KOC-1B4K0S: Service Manual
Manual is about: Microwave Oven

Summary of KOC-1B4K0S

  • Page 1

    Service manual microwave oven model : koc-1b4k0s koc-1b4k5s daewoo electronics co., ltd. Http://svc.Dwe.Co.Kr s/m no.: c1b4k0s002 ✔ 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,plea...

  • Page 2: Table of Contents

    1 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 microwav...

  • Page 3: 1. Safety and Precautions

    2 1. 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 t...

  • Page 4: 3. External View

    3 3. External view 2. Specifications.

  • Page 5

    4 1 1.Door hook when the door is closed, it will automatically lock shut. If door is opened while oven is operating, the magnetron will immediately stop operating. 1 2.Door viewing screen allows viewing of food. The screen is designed so that light can pass through, but not the microwave. 1 3.Metal ...

  • Page 6: 4. Installation

    5 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, eventually,...

  • Page 7: 5. Control Panel

    6 5. Control panel display window 1. Microwave - indicator, showing microwaving in progress. 2. Defrost- indicator, showing defrosting in progress. 3. Grill(upper grill heater) - indicator, showing griling in progress. 4. Grill(lower grill heater) - indicator, showing griling in progress. 5. Convect...

  • Page 8: 6. Disassembly and Assembly

    7 6. 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 possi...

  • Page 9

    Note: after replacting the door assembly, perform a check of correct alignment with the hinge and cavity front plate. 1. To remove cabinet 1) remove four screws on cabinet back. 2) push the cabinet backward. 2. To remove guide wind assembly 1) remove two screws which secure the stopper hinge top. 2)...

  • Page 10

    (1) remove the gasket door(a14) from door plate. (2) remove two screws(a08) from door plate. (3) remove the door handle (a01) and handle supporter (a02) from door plate. (4) remove the four door decorators (a03~a06) from door frame. (5) remove the door frame (a07) from door plate. (6) remove the sto...

  • Page 11

    5. To remove control panel parts. Ref no. Part code part name description q ty remark b01 3515501720 window display san 1 b02 3511605020 decorator c/panel sts 304 t0.5 hl 1 b03 3516724140 c-panel abs xr-401 h-2938 1 b04 3516908440 button function-b abs sg-175 sg-0760d 1 b05 3516908340 button functio...

  • Page 12

    Caution : never install the magnetron without the metallic gasket plate which is packed with each magnetron to prevent microwave leakage. Whenever repair work is carried out on magnetron, check the microwave leakage. It shall not exceed 4mw/cm 2 for a fully assembled oven with door normally closed. ...

  • Page 13

    8. To remove wind guide assembly. 1) remove a screw for earthing. 2) remove the noise filter from the wind guide. 3) remove a 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 ...

  • Page 14

    10. To remove lamp assembly parts. 1) remove a screw and pull out guide air outlet . 2) remove two screws and pull out insulator heater *t . 3) pull out the lamp assembly. 4) remove two screws pull out the lamp assembly. 5) pull out the holder lamp assembly from the cover lamp . 6) pull out the lamp...

  • Page 15

    14 11. To remove top heater assembly parts. 1) remove a screw and pull out guide air outlet . 2) remove two screws and pull out insulator heater *t . 3) pull out the top heater assembly. 4) pull out the harness heater . 5) pull out the braket heater*t from the cover heater*t . 6) pull out the heater...

  • Page 16

    15 12. To remove rear heater assembly parts. 1) remove a screw and pull out cover motor *b . 2) remove a screw and pull out cover *b . 3) pull out the harness convection-b . 4) remove four screws and then pull out the rear heater assembly. 5) remove a nut and the pull out the fan convection and wash...

  • Page 17

    16 13. To remove motor synchro. And under heater assembly parts. 1) cut the motor syncro. Cover parts from the base plate. 2) remove a screw and then pull out motor syncro. 3) remove a screw and then pull out the under heater *u. Assembly. 4) remove a screw . 5) pull out the heater *u from the cover...

  • Page 18

    17 7. 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...

  • Page 19: 8. Trouble Shooting Guide

    18 8. 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 t...

  • Page 20

    19 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 line filter board no continuity replace check continuity of power supply cord defective touch...

  • Page 21

    20 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 defective high voltage fuse remedy 1 replace no microwave oscillation check continu...

  • Page 22

    21 (trouble 4) grill heater (upper heater) is not heated; food will not become hot. Condition check check continuity of primary interlock switch malfunction of primary interlock switch result no continuity cause remedy cause remedy adjust or replace grill heater is not heated. Check d.C voltage bein...

  • Page 23

    22 (trouble 6) lower heater is not heated; food will not become hot. Condition check check continuity of primary interlock switch malfunction of primary interlock switch result no continuity cause remedy adjust or replace lower heater is not heated check d.C voltage being supplied to relay (ry7) coi...

  • Page 24

    23 cause remedy (trouble 8) when error 2 error 3 come on display. Condition check check continuity of thermistor (resistance of thermistor) defective thermistor result 0 or infinite replace error 2 & error 3 come on display check continuity of heater (convection, upper, lower) defective touch contro...

  • Page 25: 9. Measurement and Test

    24 9. 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 microwa...

  • Page 26

    25 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 27

    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 fro...

  • Page 28

    4. Component action cooking mode m/w grill-1 grill-2 grill-3 combi-1 combi-2 manual combi-3 mode combi-4 combi-5 convection100~130 convection140~150 convection160~250 one cake/bread touch crusty roast beef roast chicken roast pork baked fish auto baked potato mode roast potato fresh vegetables froze...

  • Page 29: 10. Wiring Diagram

    10. Wiring diagram 28.

  • Page 30

    11. Exploded view and parts list 1. Door assembly 2. Control panel assembly 3. Total assembly 29.

  • Page 31

    30 no part code part name description q’ty a00 3511714040 door as koc-1b4k0s 1 b00 pkcpswad00 control panel as koc-1b4k0s 1 pkcpswad20 koc-1b4k5s 1 f01 3515202200 stopper hinge *u as kor-121m0a 1 f02 7272400800 screw taptite tt3 trs 4x8 mfzn 1 f03 3510313500 base sbhg t0.8 1 f04 7112401011 screw tap...

  • Page 32

    31 no part code part name description q’ty f36 3512766800 harness convection-a koc-1b0k0s 1 f37 3511407700 cover heater *b sa1d-80 t0.5 1 f38 3513302900 insulator heater *b sbhg-1 t0.5 1 f39 7113400814 screw tapping t1 bin 4x8 mfni 4 f40 3963514300 motor shaded pole 230v 50hz mw10ca-t02 1 f41 351180...

  • Page 33

    32 no part code part name description q’ty f73 7112401411 screw tapping t1 trs 4x10 mfzn 1 f74 3512767000 harness heater koc-1b0k0s 1 f75 3517207300 tray rack as koc-1b0kos 120mm 1 f76 3517207310 tray rack as koc-1b0kos 30mm 1 f77 3517207200 tray metal spp t0.6 1 f78 3512521000 guide roller as koc-1...

  • Page 34: 12. Printed Circuit Board

    33 12. Printed circuit board 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 2. Voltage check - key check point - check method note 1. Secondary side voltage of the low voltage tr...

  • Page 35

    34 3. Case of no microwave oscillation 1) when touching m/w button, oven lamp turns on and fan motor and turntable rotate, and cook indicator in display comes on. *cause: relay 1 does not operate. 2) when touching m/w button, oven lamp does not turn on and turntable motor does not rotate but cook in...

  • Page 36

    35 4. Case of no heating of upper grill when touching grill1 & combi button, oven lamp turns on and fan motor and turntable rotate, and cook indicator in display comes on. *cause: relay 2 does not operate. 5. Case of no heating of lower grill when touching grill2 & combi button, oven lamp turns on a...

  • Page 37

    36 7. Case of no stopping of the count down timer when the door is opened during operation, the count down timer does not stop. Point state door open door closed a open close b +5v dc gnd b a check no method remedy 1 check the stage(on,off) of the door open replace door open monitor swith. Monitor s...

  • Page 38: 13. P.C.B. Circuit Diagram

    37 13. P.C.B. Circuit diagram.

  • Page 39

    38 no name symbol specifcation part code q’ty 1 pcb main m231 95.5 x 197 3514322720 1 2 pcb sub m232 88 x 197 3514322730 1 3 buzzer bz1 bm-20k 3515600100 1 4 capacitor ceramic c1~c4,c7~c12 104 50v z axial cczf1h104z 10 5 capacitor ceramic c5,c6 102 50v z axial cczb1h102k 2 6 capacitor electro ec1 50...

  • Page 40

    Daewoo electronics co., ltd. Printed date: dec, 2001 686, ahyeon-dong mapo-gu seoul, korea c.P.O box 8003 seoul, korea telex: dwelec k28177-8 cable: “daewooelec” s/m no. : c1b4k0s002.