Service manual microwave oven model: koc-1b4k0s koc-1b4k0s01 koc-1b4k0s10 koc-1b4k0s20 koc-1b4k0s31 koc-1b4k9sa1 koc-1b4k5s koc-1b4k5s10 s/m no. : oc1b4k0001 dec. 2005 ✔ caution : in this manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you ...
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 3. External view 2. Specifications * specifications are subject to change without notice. 3-1. Outer dimension model koc-1b4k0s,1b4k0s01,1b4k0s10, koc-1b4k5s,1b4k5s10 1b4k0s20,1b4k0s31,1b4k9sa1 power supply 220~230v~50hz, single 220~240v~50hz, single phase with earthing phase with earthing microwa...
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 ...
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,...
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...
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 safety during normal operation. However, carelessness in servicing the oven can result in an electric shock or pos...
8 1. To remove cabinet 1) remove three 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 reassembly. Note : after replacing the door ...
9 3. To remove door parts. A10 a11 a09 a07 a04 a05 a03 a01 a08 a13 a12 a14 a02 a06 ref no. Part code part name description q’ty remark 3512603530 koc-1b4k's 3512604200 al koc-1b4k0s a01 handle door 1 baumatic 3512604210 steel koc-1b4k5s omega 3512603540 abs koc-1b4k9sa1 3515307400 al koc-1b4k0s a02 ...
10 (1) remove the gasket door from door plate. (2) remove a screw 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 two screws from door frame. (7) remove the handle door and barrier screen out...
11 5. To remove control panel parts. B01 b02 b03 b04 b05 b06 b07 b08 b09 b10 b11 b12 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 ...
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 close...
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 moto...
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 l...
15 11. To remove top heater assembly parts. 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 6 from the cover heater*t 8 . 6) pull ...
16 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...
17 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 1 and then pull out the under heater *u. Assembly. 4) remove a screw 5 . 5) pull out the heater *u 4 from the...
18 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...
19 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...
20 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...
21 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...
22 (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...
23 (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...
24 cause remedy (trouble 8) when “error 2 error 3” come on display. Condition check check continuity of thermistor (resistance of thermistor) replace result 0 Ω or infinite replace “error 2 & error 3” come on display check continuity of heater (convection, upper, lower) defective touch control circu...
25 9. Measurement and test 9-1. 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 micro...
26 9-2. 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 a...
27 9-3. 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 ove...
28 9-4. 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 ...
29 10. Wiring diagram koc-1b4k0s, 1b4k0s10, 1b4k0s 20, 1b4k5s, 1b4k5s10
30 koc-1b4k0s01, 1b4k0s31, 1b4k9sa1.
31 11. Exploded view and parts list 11-1. Door assembly refer to 6. Disassembly and assembly. 11-2. Control panel assembly refer to 6. Disassembly and assembly. 11-3. Total assembly.
32 no part code part name description q’ty remark 3511714040 koc-1b4k0s a00 3511714050 door as koc-1b4k0s baumatic 1 koc-1b4k0s baumatic 3511714060 koc-1b4k5s omega koc-1b4k5s omega 3511714070 koc-1b4k9sa1 koc-1b4k9sa1 pkcpswad00 koc-1b4k0s koc-1b4k0s, 1b4k0s10,1b4k0s20 b00 pkcpswad10 control panel ...
33 no part code part name description q’ty remark f28 4415a17352 sw micro vp-533a-0f spno #187 200g 2 f29 4415a66910 sw micro vp-531a-0f/szm-v16-fa-61 2 f30 3513700800 lever lock pom 1 f31 7122401211 screw tapping t2s trs 4x12 mfzn 1 koc-1b4k0s, 3512717700 harness main koc-1b0k0s 1b4k0s10,1b4k0s20, ...
34 no part code part name description q’ty remark f63 3510803320 cabinet pcm 1 3510806800 sts430 koc-1b4k5s omega f64 7121400611 screw tapping t2s pan 4x6 mfzn 1 f65 7112401011 screw tapping t1 trs 4x10 mfzn 2 f66 3513302800 insulator heater *t secc t0.5 1 f67 3512520500 guide air outlet sa1d-80 t0....
35 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: 220~240v / frequency: 50hz 2. Voltage check - key check point - check method note 1. Secondary side voltage of the low voltag...
36 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. - check method 2) when touching m/w button, oven lamp does not turn on and turntable motor does not rot...
37 4. Case of no heating of upper grill when touching grill1 & combi button, oven lamp turns on and fan motor and turntable motor rotate and cook indicator in the display comes on. *cause: relay 2 does not operate. 5. Case of no heating of lower grill when touching grill2 & combi button, oven lamp t...
38 7. Case of no stopping of the count down timer when the door is opened during operation, the count down timer does not stop. - check method 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 s...
39 13. P.C.B. Circuit diagram.
40 no name symbol specifcation part code q’ty remark 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...
41 no name symbol specifcation part code q’ty remark 42 sw relay ry2,ry3 g5g-1a-dt 24v 5sc0101124 2 " (ozf-s-124lm1p) 5sc0101117 2 43 sw relay ry4~ry7 cs11-24sh 5sc0101129 4 44 transistor q1,q2 kta1266y auto tzta1266y- 2 45 transistor q3,q4,q12,q15 ktc3198gr auto tztc3198gr 4 46 transistor q14 ktc-1...
S/m no. : oc1b4k0001 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: dec. 2005.
