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Daewoo KOC-924T0S Service Manual

Other manuals for KOC-924T0S: Owner's Manual

Summary of KOC-924T0S

  • Page 1

    Service manual microwave oven model: koc-924t0s/925t9s koc-924t5s/925t5s koc-924t0s01/925t9s01 koc-924t5s01/925t5s01 daewoo electronics corp. S/m no. : c924t0s004 http : //svc.Dwe.Co.Kr may. 2003 ✔ caution : in this manual, some parts can be changed for improving, their performance without notice in...

  • 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: 2. Specifications

    3 2. Specifications model koc-924t0s/924t0s01/925t9s/925t9s01 power supply 230v~50hz, single phase with earthing microwave 1500w power grill 1150w consumption convection 2550w combination 3000w microwave energy output 1000w(iec705) microwave frequency 2450mhz outside dimensions (w x h x d) 542x329x5...

  • Page 5: 3. External View

    4 3. External view 542 329 515 1. Outer dimension 1) koc-924t0s/924t5s/924t0s01/924t5s01 2) koc-925t9s/925t5s/925t9s01/925t5s01.

  • Page 6

    5 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 7: 4. Installation

    6 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 8: 5. Control Panel

    7 5. Control panel mw grill combi convection auto cook clock start/speedy cook stop/clear weight defrost koc-924t mw grill combi weight time auto- lock con- g cook vection defrost auto cook menu 1. Roast pork 2. Roast beef 3. Roast chicken 4. Baked fish 5. Fresh vegetable 1 2 3 4 5 6 16 17 18 20 7 8...

  • Page 9: 6. Disassembly and Assembly

    8 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 10

    1. To remove cabinet 1) remove four 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 assemby. 9 note: after replacing the door assem...

  • Page 11

    10 3. To remove door parts. A10 a09 a08 a07 a06 a05 a04 a03 a02 a01 a11 a12 a13 ref no. Part code part name description q’ty remark a01 3512603620 handle door s455c 1 a02 3511608300 decorator door*r sus430 t0.5 h/l 1 a03 3512204820 frame door alloy pc+abs 1 a04 7001503011 screw machine pan 5*30 mfzn...

  • Page 12

    11 (1) remove the gasket door from door plate. (2) remove screws from door plate. (3) remove the door frame from door plate. (4) remove the stopper hinge top from door plate. (5) remove the spring and the hook. (6) remove the handle door and barrier screen outer from door frame. (7) reverse the abov...

  • Page 13

    12 5. To remove control panel parts. 1) koc-924t0s/924t5s/924t0s01/924t5s01 ref no. Part code part name description q’ty remark b01 3513406310 knob volume abs sg-175 sg-0760d 1 b02 3515501820 window display pmma 1 b03 3511608100 decorator c-panel sus430 t0.5 h/l 1 b04 3516003940 special double tape ...

  • Page 14

    13 2) koc-925t9s/925t5s/925t9s01/925t5s01 ref no. Part code part name description q’ty remark b01 3513406310 knob volume abs sg-175 sg-0760d 1 b02 3515501820 window display pmma 1 b03 3511608110 decorator c-panel sus430 t0.5 h/l 1 b04 3516005600 special double tape hostic 550m(d)to.15 1 b05 35167252...

  • Page 15

    14 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 close...

  • Page 16

    15 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 shad...

  • Page 17

    16 1) remove a screw 1 and pull out guide air outlet 2 . 2) remove two screws 4 and pull out insulator heater *t 3 . 3) pull out the top heater assembly. 4) pull out the harness heater 5 . 5) pull out the braket heater*t from the cover heater*t 8 . 6) pull out the heater miraclon 7 from the cover he...

  • Page 18

    17 11. To remove rear heater assembly parts. 1) remove a screw 1 and pull out cover motor *b 2 . 2) remove a screw 3 and pull out cover *b 4 . 3) pull out the harness convection-b 5 . 4) remove four screws 6 and then pull out the rear heater assembly. 5) remove a nut e and the pull out the fan conve...

  • Page 19

    18 1) remove a screw 3 and then pull out motor syncro 1 . 2) pull out the gasket 2 from the motor syncro. 3) remove a screw 5 and then pull out rotary guide 4 . 4) reverse the above steps for reassembly. 12 to remove barbecue motor syncro and guide rotary part. 1 2 3 4 5 ref no. Part code part name ...

  • Page 20

    19 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 21: 8. Trouble Shooting Guide

    20 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 22

    21 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 23

    22 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 24

    23 (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 25

    24 condition check check each button for continuity of the button malfunction of sub pcb assembly result normal cause remedy replace control box sub-assembly display does not show programming at all, even if keyboard is touched. (trouble 6) the following visual conditions inditions indicate a probab...

  • Page 26: 9. Measurement and Test

    25 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. A cylindrical container of borosilicate glass is used for t...

  • Page 27

    26 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 28

    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 ...

  • Page 29

    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 baked potato roast potato fresh ...

  • Page 30: 10. Wiring Diagram

    29 10. Wiring diagram yw : yellow br : brown : off cook door : closed condition cm : convection fan motor [ ol : oven lamp fm : fan motor rd : red wh : white bk : black bl : blue ] ge : green/yellow gn : green note : ttm : turntable motor ttm fm secondary primary interlock interlock monitor switch t...

  • Page 31

    30 - koc-924t0s01/924t5s01/925t9s01/925t5s01.

  • Page 32

    31 11. Exploded view and parts list 1. Door assembly refer to 6. Disassembly and assembly. 2. Control panel assembly refer to 6. Disassembly and assembly. 3. Total assembly f50 f51 f48 f47 f62 f63 b00 a00 f02 f01 f05 f06 f03 f04 f72 f07 f08 f09 f10 f61 f59 f60 f54 f58 f65 f49 f64 f55 f52 f56 f57 f42...

  • Page 33

    32 no part code part name description q'ty note a00 3511714520 door as koc-924t0s 1 b00 3516725640 control panel as koc-924t0s 1 3516725650 koc-924t5s pkcpswax00 koc-925t9s 3516730330 koc-925t5s f01 3516003700 special screw tt3 hex 4*8 flg mfzn 2 f02 3512521000 guide roller as koc-1bokos 1 f03 35172...

  • Page 34

    33 no part code part name description q'ty note f35 3963514300 motor shaded pole 230v 50hz mw10ca-t02 1 f36 3513303400 insulator heater*b sbhg-1 t0.5 1 f37 3511409800 cover heater*b sa1d-80 t0.5 1 f38 3511800700 fan convection sa1d-80 t0.5 1 f39 3512801800 heater 230v 1400w 1r18344 1 f40 3513002300 ...

  • Page 35: 12. Printed Circuit Board

    34 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: 230v / frequency: 50hz 2. Voltage check - key check point - check method note 1. Secondary side voltage of the low voltage tr...

  • Page 36

    35 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 37

    36 4. Case of no heating of top grill when touching grill or 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 convection grill when touching convection button, oven lamp turns on an...

  • Page 38

    37 6. 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 cn1 1 2 d6 c1 +5v r3 c2 3 r2 a b d.O.M sw check no method remedy check the stage(on,off) of the door open 1 moni...

  • Page 39: 13. P.C.B. Circuit Diagram

    38 13. P.C.B. Circuit diagram.

  • Page 40

    39 no name symbol specifcation part code q'ty 1 buzzer bz1 bm-20k 3515600100 1 2 c array ca1 5p(4) 102 m 50v cn4xb-102m 1 3 c cera c1~11 104 50v z axial cczf1h104z 11 4 c electro ec1 50v rs 10uf cexe1h100a 1 5 c electro ec2 50v rss 100uf cexf1h101v 1 6 c electro ec3,4 50v rss 220uf cexf1h221v 2 7 c ...

  • Page 41

    S/m no. : c924t0s004 daewoo electronics corp. 686, ahyeon-dong mapo-gu seoul, korea c.P.O. Box 8003 seoul, korea telex: dwelec k28177-8 cable: “daewooelec” printed date: may. 2003.