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- Daewoo
- Microwave Oven
- KOC-1B0K0S
- Service Manual
Daewoo KOC-1B0K0S Service Manual
Summary of KOC-1B0K0S
Page 1
Service manual microwave oven model : koc-1b0k0s http : //svc.Dwe.Co.Kr apr. 2001 daewoo electronics co., ltd. S/m no. : c1b0k0s003.
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-1b0k power supply 230v~50hz, single phase with earthing microwave 1500w grill 1600w convection 2300w power consumption combination 3100w microwave energy output 1000w (iec705) microwave frequency 2450mhz outside dimensions (w x h x d) 560 x 344 x 542 mm (22.0 x 13.5 x 2...
Page 5
4 3-2. Feature diagram 1. Door hook – when the door is closed, it will automatically shut. If the door is opened while the oven is operating, the magnetron will immediately stop operating. 2. Door viewing screen – allows viewing of food. The screen is designed so that light can pass through, but not...
Page 6: 4. Installation
5 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 ...
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 grilling in progress. 4. Grill (lower grill heater) indicator, showing grilling in progress. 5. Convecti...
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 safety during normal operation. However, carelessness in servicing the oven can result in an electric shock or pos...
Page 9
8 a01 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 assembly. 3. To remove door parts . ...
Page 10
9 (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 oute...
Page 11
10 5. To remove control panel parts. Ref.No part code part name description q’ty remark b01 3511605000 decorator c-panel abs xr-401 h-2938 1 b02 3511605100 decorator ring abs sg-175 sg-0760d 1 b03 3515501700 window display pmma 1 b04 3516724100 control panel abs xr-401 h-2938 1 b05 3516908300 button...
Page 12
11 6. To remove high voltage capacitor. (1) remove a screw which secure the groun- ding ring terminal of the h.V.Diode and the capacitor holder. (2) remove the h.V. Diode from the capacitor holder. (3) reverse the above steps for reassembly. L high voltage circuit wiring 7. To remove magnetron. (1) ...
Page 13
12 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...
Page 14
13 10. To remove lamp assembly parts. Ref.No part code part name description q’ty remark 1 7112401011 screw tapping t1 trs 4x10 mfzn 1 2 3512520500 guide air outlet sa1d t0.5 1 3 3513302800 insulator heater *t sbhg t0.6 1 4 7112401011 screw tapping t1 trs 4x10 mfzn 2 5 3511407800 cover lamp sts430 t...
Page 15
14 11. To remove top heater assembly parts. Ref.No part code part name description q’ty remark 1 7112401011 screw tapping t1 trs 4x10 mfzn 1 2 3512520500 guide air outlet sa1d t0.5 1 3 3513302800 insulator heater *t sbhg t0.6 1 4 7112401011 screw tapping t1 trs 4x10 mfzn 2 5 3512767000 harness heate...
Page 16
15 12. To remove rear heater assembly parts. Ref.No part code part name description q’t y remark 1 7112401011 screw tapping t1 trs 4x10 mfzn 1 2 3511407300 cover motor *b sbhg t0.6 1 3 7112401011 screw tapping t1 trs 4x10 mfzn 2 4 3511407400 cover *b sbhg t0.6 1 5 3512766900 harness convection-b koc...
Page 17
16 13. To remove motor synchro. And under heater assembly parts. Ref.No part code part name description q’ty remark 1 7112401011 screw tapping t1 trs 4x10 mfzn 1 2 3511407500 cover heater *u sts430 t0.5 1 3 3515304000 supporter heater *u sts430 t0.5 1 4 3512802000 heater *u 230v 400w r18374001 1 5 7...
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 condition check result check continuity of high voltage capacitor terminals with wires removed continuity cause defective high voltage transformer remedy replace no microwave oscillation check continuity of high voltage rectifier in forward and backward direction with dc megger continuity in back...
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) 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...
Page 25: 9. Measurement and Test
24 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 wit the microw...
Page 26
25 9-2. Microwave radiation test warning l make sure to check the microwave leakage before and after repair of adjustment. L always start measuring of an unknown field to assure safety for operating personnel from microwave energy. L do not place your hands into any suspected microwave radiation fie...
Page 27
26 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...
Page 28
27 9-4. Component action cooking mode magne- tron upper element lower element rear element convec- tion fan m/w grill-1 grill-2 grill-3 combi-1 combi-2 combi-3 combi-4 combi-5 convection 100~130 ¡ É convection 140~150 ¡ É manual mode convection 160~250 ¡ É cake / bread one touch crusty roast beef ro...
Page 29: 10. Wiring Diagram
28 10. Wiring diagram.
Page 30
29 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 f31 f06 f08 f07 f05 f04 f03 f02 f01 b00 f48 f58 f37 f46 f47 f45 f44 f81 f41 f40 f42 f39 f38 f56 f27 f15 f11 f12 f09 f13 ...
Page 31
30 no part cord part name description q'ty a00 3511714000 door as koc-1b0k0s 1 b00 3516724900 control panel as koc-1b0k0s 1 f01 3515202200 stopper hinge *u as kor-121m0a 1 f02 7122400800 screw taptite tt3 trs 4x8 mfzn 1 f03 3510313500 base sbhg t0.8 1 f04 7112401011 screw tapping t1 trs 4x10 mfzn 5 ...
Page 32
31 no part cord part name description q'ty f36 3512766800 harness convection-a koc-1b0k0s 1 f37 3511407700 cover heater *b sa1d t0.5 1 f38 3513302900 insulator heater *b sa1d t0.5 1 f39 7113400814 screw tapping t1 bin 4x8 mfni 4 f40 3963514300 motor shaded pole 230v 50hz mw10ca-t02 1 f41 3511800800 ...
Page 33
32 no part cord part name description q'ty f73 3514801400 sensor temperature ptm-k312-d7 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
33 12. P r int e d c ir c uit b oar d 1. C ir c uit c he c k p r oc e dur e 1) low voltage transformer check t he low voltage transformer is located on the p.C .B . Measuring condition: input voltage: 230 v / f requency: 50hz 2) voltage c heck - k ey check point no c he c k p oint r e mar k 1 ic 1 p...
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. - check method state point a point b relay 1 on +5v dc gnd relay 1 off gnd +24v dc (2) when touching ...
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 motor rotate and cook indicator in the display comes on. L cause: relay 2 does not operate. State point a point b relay 2 on +5v dc gnd relay 2 off gnd +24v dc 5) case of no he...
Page 37
36 state point a point b relay 3 on +5v dc gnd relay 3 off gnd +24v dc 7) case of no stopping of the count do wn timer when the door is opened during operation, the count down timer does not stop. - check method point state a b 1) door open open +5v dc 2) door closed close gnd check no method remedy...
Page 38
37 13. P.C.B. Circuit diagram a b.
Page 39
Pcb ass ’y part list 38 no name symbol specifcation part code q'ty 1 pcb main m223 95.5 x 197 3514322300 1 2 pcb sub m224 90 x 197 3514322310 1 3 buzzer bz1 bm-20k 3515600100 1 4 capacitor ceramic c1~c3,c6~c11 104 50v z axial cczf1h104z 9 5 capacitor ceramic c4,c5 102 50v z axial cczb1h102k 2 6 capa...