Service manual microwave oven model: koc-9q3t7s koc-9q4t7s koc-9q4t7wa9 s/m no. : mar. 2010 ✔ 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 ...
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...
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...
3 model koc-9q3t7s power supply 230v~50hz, single phase with earthing microwave 1400w power grill 1250w consumption convection 1250w combination 2700w microwave energy output 900w (iec 705) microwave frequency 2450mhz outside dimensions (w x d x h) 513x382x311mm(20.2x15x12.2 in.) cavity dimensions (...
4 3. External view 382 513 311 1. Outer dimension 1) koc-9q3t7s 383 513 311 2) koc-9q4t7s / 9q4t7wa9.
5 1 2 3 4 5 6 7 8 9 10 11 12 13 1 1. Door hook hook automatically locks and holds the door when the door shuts. If the door opens while the oven is operating, the oven will stop operating immediately. 1 2. Door seal door seal prevents the microwave leakage from the oven cavity. 1 3. Door viewing scr...
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,...
7 5. Control panel 1 1 display : cooking time, power level, program indicators and present time are displayed. Mw ( ): when blinking, the oven is operating in microwave cook mode. Grill ( ): when blinking, the oven is operating in grill mode. Combi ( ): when blinking, the oven is operating in combi ...
8 1 1 display : cooking time, power level, program indicators and present time are displayed. Mw ( ): when blinking, the oven is operating in microwave cook mode. Grill ( ): when blinking, the oven is operating in grill mode. Combi ( ): when blinking, the oven is operating in combi mode. Convection ...
9 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 safety during normal operation. However, carelessness in servicing the oven can result in an electric shock or pos...
10 1. To remove cabinet 1) remove five 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 assembly. Note: after replacing the door ass...
11 a01 a03 a02 a04 a07 a08 a06 a05 3. To remove door parts. 1) koc-9q3t7s (1) remove the gasket door from door as. (2) remove screws from door as. (3) remove the handle door from door as. (4) remove the door-palte from frame door. (5) remove the stopper hinge *t as from door-plate. (6) remove the sp...
12 b01 3512607710 handle door abs sg-0760d, sg-175 spray 1 b02 3512209640 frame door abs xr-401 1 b03 3515204120 stopper hinge *t as kor-6l0b1a 1 b04 3516603100 door-plate secc 0.5t 1 b05 7122401211 screw tapping t2s trs 4x12 mfzn 2 b06 3512302410 gasket door lupol 2300 1 b07 3515101310 spring hook ...
13 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...
14 b01 b02 b03 b04 b07 b06 b05 5. To remove control panel parts. 1) koc-9q3t7s (1) pull out the knob dial from control-panel as. (2) remove screws securing the pcb main as. (3) pull out the pcb main as. (4) pull out the button function a and b. (5) reverse the above steps for reassembly. ✔ caution :...
15 2) koc-9q4t7s / 9q4t7wa9 ✔ 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 (http://svc.Dwe.Co.Kr). B01 b02 b03 b...
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...
17 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 a screw for earth. 2) remove the noise filter from the wind guide. 3) remove a screw which secure ...
18 ✔ 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 (http://svc.Dwe.Co.Kr). 10. To remove fan convection assembly ...
19 ✔ 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 (http://svc.Dwe.Co.Kr). 11. To remove top heater assembly part...
20 ✔ 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 (http://svc.Dwe.Co.Kr). 12. To remove guide air assembly parts...
21 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...
22 8. Troubleshooting 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 tr...
23 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...
24 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...
25 (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 main heater is not heated. Check d.C voltage being...
26 condition check check each button for continuity of the button malfunction of touch control circuit of control box sub-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 condi...
27 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...
28 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 ...
29 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 ...
30 4. Component action m/w ● ● grill ● ● ● combi ● ● ● ● convection ● ● ● roast pork ● ● ● ● roast beef ● ● ● ● roast chicken ● ● ● ● baked fish ● ● ● ● fresh vegetables ● ● defrost ● ● steam cleaning ● ● ● warm ● ● manual mode cooking mode auto mode magne- tron main heater sub heater convec- tion f...
31 10. Wiring diagram.
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 1) koc-9q3t7s h35 h37 h05 h02 h56 h57 h55 h07 h13 h15 h16 h14 h16 h27 h21 h20 h24 h33 h26 h22 h23 h08 h39 h43 h31 h46 h49 h50 h...
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 (http://svc.Dwe.Co.Kr). H01 3516119900 cavity as koc-9q0t7s 1 ...
34 ✔ 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 (http://svc.Dwe.Co.Kr). H39 3512529400 guide wind as koc-9q0t7...
35 1. Door assembly refer to 6. Disassembly and assembly. 2. Control panel assembly refer to 6. Disassembly and assembly. 3. Total assembly 2) koc-9q4t7s / 9q4t7wa9 h35 h37 h05 h02 h56 h57 h55 h07 h13 h15 h16 h14 h16 h27 h21 h20 h24 h33 h26 h22 h23 h08 h39 h43 h31 h46 h49 h50 h45 h53 h41 h03 h38 h09...
36 ✔ 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 (http://svc.Dwe.Co.Kr). H01 3516119900 cavity as koc-9q0t7s 1 ...
37 ✔ 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 (http://svc.Dwe.Co.Kr). H39 3512529400 guide wind as koc-9q0t7...
38 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...
39 measurepoint mp1 mp2.
40 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...
41 4. Case of no heating of top heater main. When touching grill or combi or convection button, oven lamp turns on and fan motor and turntable rotate, and cook indicator in display comes on. *cause: relay 3 does not operate. State relay 3 on relay 3 off point a +5v dc gnd point b gnd 12v dc ry3 (gri...
42 - check method 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 yw396-02v d.O.M sw 1 2 v2 r9 r10 47k r11 10k c1 104z 28 p32 4.7k v1 q6 a1266y v1 d6 1n4148 a ...
43 13. P.C.B. Circuit diagram.
44 1 bz1 3515600100 buzzer bm-20k 1 2 ca1 cn5xb-102m c array 6p(5) 1000pf m 50v 1 3 c7 cczf1h473z c cera 50v hikf 0.047uf z 1 4 c4,c6 cczb1h102k c cera 102k 50v axial 2 5 c1~3,c5,c8,c9 cczf1h104z c cera 50v hikf 0.1uf z 6 6 ec1 cexe1h100a c electro 50v rss 10mf 1 7 ec2 cexf1e102v c electro 25v rss 1...
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: mar. 2010
V viis siio on n c cr re ea at tiiv ve e,, iin nc c.. 서울 종로구 통의동 6 번지 이룸빌딩 4 층 about this manual about this manual 담 당 박진형 과장님 m o d e l koc-9q3t7s, koc-9q4t7s, 9q4t7wa9 (s/m) 접 수 2009.09.25 1차 2차 일 정 3차 4차 5차 제 판 한 인 인 쇄 쇄 규 격 memo 총 46p 연락처 vision 담 당 방 문 수 tel: 730-0660 fax: 730-3788 09.09.25-전체신...
