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  4. KOC-9N4T7S
  5. Service Manual

Daewoo KOC-9N4T7S Service Manual - 5. Control Panel

Summary of KOC-9N4T7S

  • Page 1

    Service manual microwave oven model: koc-9n4t7s koc-9n4t7s24 koc-9n5t7s koc-9n5t7r koc-9n5t7s21 koc-9n7t7s koc-9n7t7s21 koc-9n7t7sa2 s/m no. : oc9n4t7001 jun. 2005 ✔ caution : in this manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need...

  • Page 2: Table of Contents

    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 microwave ...

  • Page 3: 1. Safety and Precautions

    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 tra...

  • Page 4: 2. Specifications

    3 model koc-9n4t7s, 9n4t7s24, koc-9n5t7r 9n5t7s, 9n5t7s21 power supply 230v~50hz, single phase with earthing microwave 1450w power consumption grill 850w convection 2250w 1450w combination 2950w 1450w microwave energy output 900w (iec 705) microwave frequency 2450mhz outside dimensions (w x h x d) 5...

  • Page 5: 3. External View

    4 3. External view 542 329 514.1 1. Outer dimension 1)koc-9n4t/9n5t 2)koc-9n7t.

  • 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. Met...

  • Page 7: 4. 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, eventually, c...

  • Page 8: 5. Control Panel

    7 5. Control panel 1 1 display : cooking time, power level, indicators and present time are displayed. Mw : when blinking, the oven is operating in microwave cook. Grill : when blinking, the oven is operating in grill. Combi : when blinking, the oven is operating in combi. Defrost weight : when blin...

  • Page 9: 6. Disassembly and Assembly

    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 possibl...

  • 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. Note: after replacing the door assembl...

  • Page 11

    10 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 2 a05 3515101800 spring ...

  • Page 12

    11 ref no. Part code part name description q’ty remark a01 3511614600 decorator door sts430 t0.5 h/l 1 a02 3512209200 frame door abs xr-401 sr-0320 1 a03 3517007120 barrier-screen*o temp glass t3.2 1 a04 3515204900 stopper hinge*t as scp-1 t2.0 1 a05 3516602200 door plate sbhg-3a t0.7 1 a06 35123024...

  • 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 stopper hinge top, and then push the door to contact the door seal to oven front surface. • tighten two screws. (2) to reduce gap located on part ‘b’. • loos...

  • Page 14

    13 5. To remove control panel parts. 1) koc-9n4t7s,9n4t7s24 ref no. Part code part name description q’ty remark b01 3513406330 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 si-161 t0.15 1 b...

  • Page 15

    14 2) koc-9n5t7s,9n5t7r,9n5t7s21 ref no. Part code part name description q’ty remark b01 3513406330 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 3516725260 contro...

  • Page 16

    15 3) koc-9n7t7s,9n7t7s21,9n7t7sa2 ref no. Part code part name description q’ty remark b01 3513408410 knob volume abs sg-175 sg-0760d 1 b02 3515501820 window display pmma 1 b03 3511614700 decorator c-panel sts430 t0.5 h/l 1 b04 3516006200 special double tape koc-9n7t7s 1 b05 3516732700 control-panel...

  • Page 17

    16 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 18

    17 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 19

    18 10. To remove top heater assembly parts. 1) remove a screw and pull out guide air outlet . 2) remove screws and pull out braket heater *t . 3) pull out heater miraclon 4) remove two screws . 5) pull out the heater reflector from cover heater *t . 6) reverse the above steps for reassembly. Ref no....

  • Page 20

    19 11. 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 . 6) rem...

  • Page 21

    20 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 22: 8. Trouble Shooting Guide

    21 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 23

    22 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 24

    23 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 25

    24 (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 26

    25 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 27: 9. Measurement and Test

    26 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 28

    27 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 the ce...

  • Page 29

    28 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 i...

  • Page 30

    29 4. Component action cooking mode magne- upper rear convec- tron element element tion fan m/w ● grill ● combi ● ● ● ● convection ● ● ● roast pork ● ● ● ● roast beef ● ● ● ● roast chicken ● ● ● ● baked fish ● ● ● ● fresh vegetables ● manual mode auto mode.

  • Page 31: 10. Wiring Diagram

    30 10. Wiring diagram 1) koc-9n4t7s,9n4t7s24,9n5t7s,9n5t7r,9n5t7s21,9n7t7s,9n7t7s21.

  • Page 32

    31 2) koc-9n7t7sa2.

  • Page 33

    32 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.

  • Page 34

    33 ✔ 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 no part cord part name description q'ty remark a00 3511714530 ...

  • Page 35

    34 no part cord part name description q'ty remark f25 7s312x40a1 screw special t1 trs 4x10 se mfzn 1 f26 7121403011 screw tapping t2s pan 4x30 mfzn 2 f27 3510805200 cabinet as koc-910k0s 1 f28 7s312x40a1 screw special t1 trs 4x10 se mfzn 4 f29 7112401011 screw tapping t1 trs 4*10 mfzn 1 f30 35114073...

  • Page 36

    35 no part cord part name description q'ty remark f65 3510313600 base sbhg t0.8 1 f66 7272400811 screw taptite tt3 trs 4x8 mfzn 1 f67 3515202800 stopper hinge *u as kor-121m0a 1 f68 7121400611 screw tapping t1 pan 4*6 mfzn 1 f69 3966031110 motor syncro 220/240v 50/60 sm16 hk36m6f 1 f70 3514801400 se...

  • Page 37: 12. Printed Circuit Board

    36 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 38

    37 measurepoint mp1 gnd mp2.

  • Page 39

    38 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 40

    39 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 41

    40 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 r17 +5v r6 c9 15 r4 a b d.O.M sw check no method remedy check the stage(on,off) of the door open 1 mo...

  • Page 42: 13. P.C.B. Circuit Diagram

    41 13. P.C.B. Circuit diagram.

  • Page 43

    42 no loc part code name specification q'ty remark 1 bz1 3515600100 buzzer bm-20k (bujeon) 1 2 cn1 30166m7020 wafer molex 35313-0210 1 3 cn2 4cw215sbd0 conn wafer hlem15s-1 1 4 cn3 30166m5030 wafer molex 35312-0310 (white) 1 5 cn4 4cw3061mx0 conn wafer molex 35328-0610 1 6 dp1 dsvm5ms06- digitron sv...

  • Page 44

    43 no loc part code name specification q'ty remark 39 c01 cczf1h104z c cera hikf 50v 0.1mf z axial 1 40 c02 cczf1h104z c cera hikf 50v 0.1mf z axial 1 41 c03 cczf1h102z c cera hikf 50v 1000pf z axial 1 42 c04 cczf1h102z c cera hikf 50v 1000pf z axial 1 43 c05 cczf1h104z c cera hikf 50v 0.1mf z axial...

  • Page 45

    44 no loc part code name specification q'ty remark 77 j08 85801052gy wire copper 1/0.52 tin coating 1 78 j09 85801052gy wire copper 1/0.52 tin coating 1 79 j10 85801052gy wire copper 1/0.52 tin coating 1 80 j11 85801052gy wire copper 1/0.52 tin coating 1 81 j12 85801052gy wire copper 1/0.52 tin coat...

  • Page 46

    45 no loc part code name specification q'ty remark 115 r16 rd-az104j- r carbon film 1/6 100k ohm j 1 116 r17 rd-az122j- r carbon film 1/6 1.2k ohm j 1 117 r18 rd-4z689j- r carbon film 1/4 6.8 ohm j1 118 r19 rd-az104j- r carbon film 1/6 100k ohm j 1 119 r20 rd-az104j- r carbon film 1/6 100k ohm j 1 1...

  • Page 47

    S/m no. : oc9n4t7001 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: jun. 2005.