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service manual microwave oven model: kog-6c075s kog-6c075s12 KOG-6C175S KOG-6C175S12 kog-6c275s kog-6c275s12 daewoo electronics corp. s/m no. : g6c075s003 http : //svc.dwe.co.kr oct. 2003 ? 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).
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 micro- wave source, and make repairs as necessary: (1) interlock operation, (2) proper door closing, (3) seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and latches, (5) evidence of dropping or abuse. (c) before turning on power to the microwave oven for any service test or inspection within the microwave gen- erating compartments, check the magnetron, wave guide or transmission line, and cavity for proper align- ment, integrity, and connections. (d) any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation and transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual before the oven is released to the owner. (e) a microwave leakage check to verify compliance with the federal performance standard should be per- formed on each oven prior to release to the owner. table of contents safety and precautions ............................................................................................................................... ............ 2 1. for safe operation ............................................................................................................................... ... 2 2. for safe service procedures ............................................................................................................. 2 specifications ............................................................................................................................... ................................ 3 external view ............................................................................................................................... ................................. 4 1. outer dimension ............................................................................................................................... ......... 4 2. feature diagram ............................................................................................................................... ......... 5 installation ............................................................................................................................... .................................... 8 operations and functions ............................................................................................................................... ........ 9 disassembly and assembly ............................................................................................................................... ..... 10 interlock mechanism and adjustment ............................................................................................................. 21 trouble shooting guide ............................................................................................................................... .......... 22 measurement and test ............................................................................................................................... ............. 24 1. measurement of the microwave power output ........................................................................24 2. microwave radiation test ................................................................................................................... 25 3. component test procedure ............................................................................................................... 26 wiring diagram ............................................................................................................................... ............................. 27 exploded view and parts list ............................................................................................................................... 28 1. door assembly ............................................................................................................................... .......... 28 2. control panel assembly ...................................................................................................................... 28 3. total assembly ............................................................................................................................... .......... 28
2 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 trained service personnel should make repairs.) (1) a broken door hinge. (2) a broken door viewing screen. (3) a broken front panel, oven cavity. (4) a loosened door lock. (5) a broken door lock. the door gasket plate and oven cavity surface should be kept clean. no grease, soil or spatter should be allowed to build up on these surfaces or inside the oven. do not attempt to operate this appliance with the door open. the microwave oven has concealed switches to make sure the power is turned off when the door is opened. do not attempt to defeat them. do not attempt to service this appliance until you have read this service manual. 2. for safe service procedures 1. if the oven is operative prior to servicing, a microwave emission check should be performed prior to servicing the oven. 2. if any certified oven unit is found to servicing, a microwave emission check should be performed prior to servicing the oven. (a) inform the manufacturer, importer or assembler, (b) repair the unit at no cost to the owner, (c) attempt to ascertain the cause of the excessive leakage, (d) tell the owner of the unit not to use the unit until the oven has been brought into compliance. 3. if the oven operates with the door open, the service person should tell the user not to operate the oven and contact the manufacturer and cdrh immediately. important the wire in this mains lead coloured in accordance with the following code. green-and-yellow : each blue : neutral brown : live as the colours of the wires in the manins lead of this appliance may not correspond with the coloured markings identifying the terminals in your plug, proceed as follows. the wire which is coloured green-and-yellow must be connected to the terminal in the plug which is marked with the letter ?? earth symbol or coloured green-and-yellow. the wire which is coloured blue must be connected to the terminal which is marked with the letter ??or coloured black. the wire which is coloured brown must be connected to the terminal which is marked with the letter ??or coloured red. note this oven is designed for counter-top use only.
3 model kog-6c075s/6c175s/6c275s/6c075s12/6c175s12/6c275s12 power supply 230v~50hz, single phase with grounding power microwave 1200w consumption grill 1050w combination 2200w microwave energy output 800w microwave frequency 2450mhz outside dimensions (w x h x d) 465 x 279 x 364 mm (18.3 x 11.0 x 14.4 in) cavity dimensions (w x h x d) 290 x 220 x 306 mm (11.4 x 8.7 x 12.0 in) net weight approx. 13.4kg timer 35 min. dual speed function selections microwave/grill/combination power selections 7 levels cavity volume 0.7 cu. ft. * specifications are subject to change without notice. specifications
4 external view 1. outer dimension 1) kog-6c075s, kog-6c075s12 2) KOG-6C175S, KOG-6C175S12 465 365 279 3) kog-6c275s, kog-6c275s12
5 2. feature diagram 1) kog-6c075s, kog-6c075s12 ewq 0 12345 9 8 7 6 1 door seal - door seal maintains the microwave energy within the oven cavity and prevents microwave leakage. 2 reflector (insulator heater) 3 heating element 4 oven cavity 5 safety interlock system 6 knob v.p.c - used to select a microwave power level. 7 knob timer - used in setting cooking time for all functions. 8 metal rack 9 coupler - this fits over the shaft in the center of the ovens cavity floor. this is to remain in the oven for all cooking. 0 roller guide - this must always be used for cooking together with the glass cooking tray. q glass cooking tray - made of special heat resistant glass. food in a proper receptacle is placed on this tray for cooking. w door viewing screen - allows viewing of food. the screen is designed so that light can pass through, but not the microwave. e door hook - when the door is closed, it will automatically shut off. if the door is opened while the oven is operat- ing, the magnetron will immediately stop operating.
6 2) KOG-6C175S, KOG-6C175S12 1 door seal - door seal maintains the microwave energy within the oven cavity and prevents microwave leakage. 2 reflector (insulator heater) 3 heating element 4 oven cavity 5 safety interlock system 6 knob v.p.c - used to select a microwave power level. 7 knob timer - used in setting cooking time for all functions. 8 metal rack 9 coupler - this fits over the shaft in the center of the ovens cavity floor. this is to remain in the oven for all cooking. 0 roller guide - this must always be used for cooking together with the glass cooking tray. q glass cooking tray - made of special heat resistant glass. food in a proper receptacle is placed on this tray for cooking. w door viewing screen - allows viewing of food. the screen is designed so that light can pass through, but not the microwave. e door hook - when the door is closed, it will automatically shut off. if the door is opened while the oven is operat- ing, the magnetron will immediately stop operating. r door open button
7 3) kog-6c275s, kog-6c275s12 1 door seal - door seal maintains the microwave energy within the oven cavity and prevents microwave leakage. 2 reflector (insulator heater) 3 heating element 4 oven cavity 5 safety interlock system 6 knob v.p.c - used to select a microwave power level. 7 knob timer - used in setting cooking time for all functions. 8 metal rack 9 coupler - this fits over the shaft in the center of the ovens cavity floor. this is to remain in the oven for all cooking. 0 roller guide - this must always be used for cooking together with the glass cooking tray. q glass cooking tray - made of special heat resistant glass. food in a proper receptacle is placed on this tray for cooking. w door viewing screen - allows viewing of food. the screen is designed so that light can pass through, but not the microwave. e door hook - when the door is closed, it will automatically shut off. if the door is opened while the oven is operat- ing, the magnetron will immediately stop operating.
8 installation 1. steady, flat location. this microwave oven should be set on a steady, flat surface. 2. leave space behind and side. all air vents should be kept a clearance. if all vents are covered during operation, the oven may be overheated and, eventually, cause oven failure. 3. away from radio, and tv sets poor television reception and radio interference may result if the oven is located close to a tv, radio, antenna, or feeder and so on. 4. away from heating appliances and water taps keep the oven away from hot air, steam or splash when choosing a place to position it, or the insulation might be adversely affected and breakdowns occur. 5. power supply check your local power source. this microwave oven requires a current of approximately 6 amperes, 230 volts, 50 hz. power supply cord is about 0.8 meters long. the voltage used must be the same as specified on this oven. using a higher voltage may result in a fire or other accident causing oven damage. using low voltage will cause slow cooking. we are not responsible for damage resulting from use of this oven with a voltage of ampere fuse other than those specified. this appliance is supplied with cable of special type, which, if damaged, must be repaired with cable of same type. such a cable can be purchased from daewoo and must be installed by a qualified person. 6. examine the oven after unpacking for any damage such as: a misaligned door, broken door or a dent in cavity. if any of the above are visible, do not install, and notify dealer immediately. 7. do not operate the oven if it is colder than room temperature (this may occur during delivery in cold weather.) allow the oven to become room temperature before operating. earthing instructions this appliance must be earthed. in the event of an electrical short circuit, earthing reduces the risk of the electric shock by providing an escape wire for the electric current. this appliance is equipped with a cord having a earth- ing plug. the plug must be plugged into an outlet that is properly installed and earthed. warning improper use of the earthing plug can result in a risk of electric shock. consult a qualified electrician or service- man if the earthing instructions are not completely understood, or if doubt exists as to whether the appliance is properly earthed, and either : if it is necessary to use an extension cord, use only a 3-wire extension cord that has a 3-blade earthing plut, and a 3-slot receptacle that will accept the plug on the appliance. the marked rating of the extension cord should be equal to or greater than the electrical rating of the appliance, or do not use an extension cord.
9 operations and functions this section includes useful information about oven operation. 1. connect the mains lead to an electrical outlet. 2. after placing the food in a suitable container, open the oven door and put it on the glass tray. the glass tray and roller guide must always be in place during cooking. 3. shut the door. make sure that it is firmly closed. when the oven door is opened, the light turns off. the oven door can be opened at any time during operation by pulling the door. the oven will automati- cally shut off. 4. how to set each function to set microwave cooking set the variable power selector to the desired power level. to set grill cooking set the power selector to the (grill) posi- tion. to set combi cooking set the power selector to the (combi) position. 5. set the time control by turning the timer knob and then microwave cooking starts. if turning the timer knob for less than 2 minutes, turn it past 2 minutes and then back to the desired time. during the same time, the rotating angle of the timer knob of the period from 35 to 10 minute is smaller than that of the period from 10 to 0 minute owing to the dual speed of the timer motor. 6. microwave energy will be turned off auto matically when the timer reaches off . then food can be taken out of the oven. to prevent the oven from operating with the door open, your microwave oven is fitted with safety door interlock switches. if you wish to inspect the food while it is cooking simply open the door. the oven will automatically stop cooking. to continue cooking, you simply close the door. if you wish to stop cooking, simply turn the timer knob to the off position. cooking can be reset at any time during the cooking cycle by turning the timer control. do not let the timer continue to operate after remov- ing or when there is no food. 7. the safety lock prevents unwanted oven operation such as by small children. to set, pull down the side knob like the figure. to cancel, lift up the slide knob. (kog-6c075s, KOG-6C175S, kog-6c275s only) 8. note : when using the grill or combi mode; do not open the door so often, the temperature inside the oven decrease and the cooking may not be completed in setting time. never touch the oven window and metal interior of the oven when taking food in and out, because the temperature inside the oven and door is very high. when using these modes, be careful as the tray will be hot to touch, use oven gloves or pot holders while handling tray. unlock lock slide knob symbol power output level power warm 26% defrost 41% 1 medilum 73% 2 med-high 88% 3 high 100%
10 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 possible danger from a short circuit. you are asked to observe the following precautions carefully. 1. always remove the power plug from the outlet before servicing. 2. use an insulated screwdriver and ware rubber gloves when servicing the high voltage side. 3. discharge the high voltage capacitor before touching any oven components or wiring. (1) check the grounding. do not operate on a two-wire extension cord. the microwave oven is designed to be used while earthed. it is imperative, therefore, to make sure it is earthed properly before beginning repair work. (2) warning about the electric charge in the high voltage capacitor. for about 30 seconds after the operation stopped and electric charge remains in the high voltage capacitor. when replacing or checking parts, short between oven chassis and the negative high terminal of the high voltage capacitor by using a properly insulated screwdriver to discharge. 4. when the 15a fuse is blown out due to the operation of the monitor switch; replace primary interlock switch, secondary interlock switch and interlock monitor switch. 5. after repair or replacement of parts, make sure that the screws are properly tightened, and all electrical connections are tightened. 6. do not operate without cabinet. caution : service personnel should remove their watches whenever working close to or replacing the magnetron. warning : when servicing the appliance, need a care of touching or replacing high potential parts because of electrical shock or exposing microwave. these parts are as follows - hv transformer, magnetron, hv capacitor, hv diode, hv fuse.
11 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 assembly, perform a check of correct alignment with the hinge and cavity front plate.
12 (1) remove the gasket door from door weld as. (2) remove the door frame from door weld as. (3) remove the stopper hinge top from door weld as. (4) remove the spring and the hook. (5) remove the barrier screen outer from door frame. (6) reverse the above steps for reassembly. 3. to remove door parts. ref no. part code part name description q?y remark a01 3512206420 frame door abs sg-0760d sg-175 1 kog-6c075s(12) 3512208500 KOG-6C175S(12) 3512208510 kog-6c275s(12) a02 3517007300 barrier-screen *o pet t0.125 1 a03 3515204100 stopper hinge *t as kor-63150s 1 a04 3511719600 door weld as kor-6c0b5s 1 a05 3517002800 barrier screen *i polyester to.1 1 a06 3512300210 gasket door pp 1 a07 3513100730 hook pom black 1 a08 3515101320 spring hook hsw-3 1 4 c a u t i o n : i n t h i s s e r v i c e m a n u a l , s o m e p a r t s c a n b e c h a n g e d f o r i m p r o v i n g , t h e i r p e r f o r m a n c e w i t h o u t n o t i c e i n t h e p a r t s l i s t . s o , i f y o u n e e d t h e l a t e s t p a r t s i n f o r m a t i o n , p l e a s e r e f e r t o p p l ( p a r t s p r i c e l i s t ) i n s e r v i c e i n f o r m a t i o n c e n t e r ( h t t p : / / s v c . d w e . c o . k r )
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 a 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 loosen two screws on stopper hinge under, and then push the door to contact the door seal to oven front surface. tighten two screws. note : a small gap may be acceptable if the microwave leakage does not exceed 4mw/cm 2 .
14 5. to remove control panel parts. 1) kog-6c075s, kog-6c075s12 1) remove the screw which secure the control panel, push two snap fits and draw forward the control panel assembly. 2) remove two screws which secure the timer assembly. 3) remove the timer assembly. 4) pull out the timer knob from timer. 5) pull out the timer coupler from timer. 6) remove the screw which secure the v.p.c coupler. 7) pull out the v.p.c coupler, v.p.c knob and flat spring from the control panel. 8) pull out the cover knob slide. 9) remove the screw which secure the lever stopper. 10) pull out the lever stopper, knob slide and flat spring from the control panel. 11) reverse the above steps for reassembly. ref no. part code part name description q?y remark b01 3513407210 knob vpc hips 1 b02 3516729010 control-panel hips 1 b03 4415a17352 sw micro vp-533a-of spno #187 200g 1 b04 3515101600 spring flat sus 301 t0.5 1 b05 3517400510 coupler vpc knob pom 1 b06 7122401211 screw tapping t2s trs 4x12 mfzn 1 b07 3512766301 harness timer kog-37150s 1 b08 3517400400 coupler timer pom 1 b09 3518205500 timer nt35mkd27e-p browner only 1 b10 7122401211 screw tapping t2s trs 4x12 mfzn 2 b11 3513407200 knob hips 1 b12 3511410200 cover knob slide pp 1 kog-6c075s b13 7122401211 screw tapping t2s trs 4x12 mfzn 1 kog-6c075s b14 3513703000 lever stopper pom 1 kog-6c075s b15 3515101600 spring flat sus 301 t0.5 1 kog-6c075s b16 3513407300 knob slide hips 1 kog-6c075s 4 c a u t i o n : i n t h i s s e r v i c e m a n u a l , s o m e p a r t s c a n b e c h a n g e d f o r i m p r o v i n g , t h e i r p e r f o r m a n c e w i t h o u t n o t i c e i n t h e p a r t s l i s t . s o , i f y o u n e e d t h e l a t e s t p a r t s i n f o r m a t i o n , p l e a s e r e f e r t o p p l ( p a r t s p r i c e l i s t ) i n s e r v i c e i n f o r m a t i o n c e n t e r ( h t t p : / / s v c . d w e . c o . k r )
15 2) KOG-6C175S, KOG-6C175S12 1) remove the screw which secure the control panel, push two snap fits and draw forward the control panel assembly. 2) remove two screws which secure the timer assembly. 3) remove the timer assembly. 4) pull out the timer knob from timer. 5) pull out the timer coupler from timer. 6) remove the screw which secure the v.p.c coupler. 7) pull out the v.p.c coupler, v.p.c knob and flat spring from the control panel. 8) pull out the cover knob slide. 9) remove the screw which secure the lever stopper. 10) pull out the lever stopper, knob slide and flat spring from the control panel. 11) reverse the above steps for reassembly. ref no. part code part name description q?y remark b01 3513407230 knob vpc hips 1 b02 3516729030 control-panel hips 1 b03 4415a17352 sw micro vp-533a-of spno #187 200g 1 b04 3515101600 spring flat sus 301 t0.5 1 b05 3517400510 coupler vpc knob pom 1 b06 7122401211 screw tapping t2s trs 4x12 mfzn 1 b07 3512766301 harness timer kog-37150s 1 b08 3517400400 coupler timer pom 1 b09 3518205500 timer nt35mkd27e-p browner only 1 b10 7122401211 screw tapping t2s trs 4x12 mfzn 2 b11 3513407220 knob hips 1 b12 3511410200 cover knob slide pp 1 KOG-6C175S b13 7122401211 screw tapping t2s trs 4x12 mfzn 1 KOG-6C175S b14 3513703000 lever stopper pom 1 KOG-6C175S b15 3515101600 spring flat sus 301 t0.5 1 KOG-6C175S b16 3513407300 knob slide hips 1 KOG-6C175S b17 3513702700 lever door open pp 1 b18 441g430171 spring button swp dia. 0.7 1 b19 3516911000 button door open abs sg-175, sg-0760d 1 4 c a u t i o n : i n t h i s s e r v i c e m a n u a l , s o m e p a r t s c a n b e c h a n g e d f o r i m p r o v i n g , t h e i r p e r f o r m a n c e w i t h o u t n o t i c e i n t h e p a r t s l i s t . s o , i f y o u n e e d t h e l a t e s t p a r t s i n f o r m a t i o n , p l e a s e r e f e r t o p p l ( p a r t s p r i c e l i s t ) i n s e r v i c e i n f o r m a t i o n c e n t e r ( h t t p : / / s v c . d w e . c o . k r )
16 3) kog-6c275s, kog-6c275s12 1) remove the screw which secure the control panel, push two snap fits and draw forward the control panel assembly. 2) remove two screws which secure the timer assembly. 3) remove the timer assembly. 4) pull out the timer knob from timer. 5) pull out the timer coupler from timer. 6) remove the screw which secure the v.p.c coupler. 7) pull out the v.p.c coupler, v.p.c knob and flat spring from the control panel. 8) pull out the cover knob slide. 9) remove the screw which secure the lever stopper. 10) pull out the lever stopper, knob slide and flat spring from the control panel. 11) reverse the above steps for reassembly. ref no. part code part name description q?y remark b01 3513407230 knob vpc hips 1 b02 3516730730 control-panel hips 1 b03 4415a17352 sw micro vp-533a-of spno #187 200g 1 b04 3515101600 spring flat sus 301 t0.5 1 b05 3517400510 coupler vpc knob pom 1 b06 7122401211 screw tapping t2s trs 4x12 mfzn 1 b07 3512766301 harness timer kog-37150s 1 b08 3517400400 coupler timer pom 1 b09 3518205500 timer nt35mkd27e-p browner only 1 b10 7122401211 screw tapping t2s trs 4x12 mfzn 2 b11 3513407240 knob hips 1 b12 3511410200 cover knob slide pp 1 kog-6c275s b13 7122401211 screw tapping t2s trs 4x12 mfzn 1 kog-6c275s b14 3513703000 lever stopper pom 1 kog-6c275s b15 3515101600 spring flat sus 301 t0.5 1 kog-6c275s b16 3513407300 knob slide hips 1 kog-6c275s 4 c a u t i o n : i n t h i s s e r v i c e m a n u a l , s o m e p a r t s c a n b e c h a n g e d f o r i m p r o v i n g , t h e i r p e r f o r m a n c e w i t h o u t n o t i c e i n t h e p a r t s l i s t . s o , i f y o u n e e d t h e l a t e s t p a r t s i n f o r m a t i o n , p l e a s e r e f e r t o p p l ( p a r t s p r i c e l i s t ) i n s e r v i c e i n f o r m a t i o n c e n t e r ( h t t p : / / s v c . d w e . c o . k r )
17 note : never install the magnetron without the metallic gasket plate which is packed with each magnetron to pre- vent 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 closed. 6. to remove high voltage capacitor. 1) remove a screw which secure the grounding 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. high voltage circuit wiring 7. to remove magnetron. 1) remove a screw which secure the magnetron. 2) remove the magnetron. 3) reverse the above steps for reassembly.
18 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 shaded pole. 7) remove the motor shaded pole. 8) reverse the above steps for reassembly. 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.
19 10. to remove tray motor. 1) remove the coupler in the cavity. 2) turn the set upside down. 3) cut the tray motor cover part from the base plate. 4) remove the tray motor cover. 5) remove a screw which secure the tray motor. 6) remove the tray motor. 7) reverse the above steps for reassembly except for securing the tray motor cover with screw. 11. to remove heater assembly. 1) remove the three nuts. 2) remove the insulator heater assembly. 3) reverse the above steps for reassembly.
20 12. to remove heater parts. insulator heater as: 3513302700 ref no. part code part name description q?y remark c01 7392500008 nut hex 6n-2-5 sus 1 c02 3515000600 spacer insulator *i c3771bd 2 c03 3513301100 insulator heater spp t0.8 1 c04 3512803400 heater 230v 1000w 1r67994001 1 c05 7002500613 screw machine trs 5x6 mfcr 1 c06 7002400413 screw machine trs 4x4 mfcr 2 4 c a u t i o n : i n t h i s s e r v i c e m a n u a l , s o m e p a r t s c a n b e c h a n g e d f o r i m p r o v i n g , t h e i r p e r f o r m a n c e w i t h o u t n o t i c e i n t h e p a r t s l i s t . s o , i f y o u n e e d t h e l a t e s t p a r t s i n f o r m a t i o n , p l e a s e r e f e r t o p p l ( p a r t s p r i c e l i s t ) i n s e r v i c e i n f o r m a t i o n c e n t e r ( h t t p : / / s v c . d w e . c o . k r )
21 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. (3) adjustment steps 1) loosen the mounting screw. 2) adjust interlock switch assembly position. 3) make sure that lock lever moves smoothly after adjustment is completed. 4) tighten completely the mounting screw. (1) primary interlock switch when the door is closed, the hook locks the oven door. if the door is not closed properly, the oven will not operate. when the door is closed, the hook pushes the button of the microswitch. then the button of the primary interlock switch bring it under on condition. (2) secondary interlock switch and interlock monitor switch when the door is closed, the hook pushes the lock lever downward. the lock lever presses the button of the interlock monitor switch to bring it under off condition and presses the button of the secondary interlock switch to bring it under on condition. adjustment : interlock monitor switch when the door is closed, the interlock monitor switch should be changed(no condition) before other switches are closed. when the door is opened, the interlock monitor switch should be changed(nc condition) after other switches are opened. note : microwave emission test should be performed after adjusting interlock mechanism. if the microwave smission exceed 4mw/cm 2 , readjust interlock mechanism. interlock mechanism and adjustment
22 (trouble 1) door shut, timer set, but no cooking takes place. 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 transformer, disconnect one lead wire from these parts and check continuity with the ac plug removed. to do otherwise may result in a false reading or damage to your meter. does the fuse blow? no no continuity no does the fan motor work when you shut the door and turn the timer? yes if outlet has proper voltage, check continuity of power supply cord. replace power supply cord. no continuity check continuity of interlock monitor switch with door shut. replace primary, secondary interlock switch and interlock monitor switch. continuity yes (refer to next page) both continuity replace fuse and check continuity of both interlock switch s contact and monitor switch s contact with door partially open until monitor switch contact. replace primary, secondary interlock switch and interlock monitor switch. no fuse again disconnect one side of the lead wire connected from transformer to the high voltage capacitor, and operate oven. replace high voltage capacitor. replace high voltage transformer normal trouble shooting guide
23 does the oven lamp light? does the turntable turn? yes yes continuity does the fan motor work when you shut the door and turn the timer? check the isolation of filament winding of high voltage transformer. replace high voltage transformer. no continuity replace magnetron good replace or repair oven lamp, turntable motor. no if microwave do not oscillate, check continuity of filament of magnetron. poor continuity no continuity check continuity filament tap (3.3v) of high voltage. replace high voltage transformer no continuity continuity check continuity filament tap (3.3v) of high voltage. replace high voltage transformer continuity in the reverse direction. replace magnetron normal reading should be approx. 0 ?
24 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 microwave oven supplied at rated voltage and operated at its maximum microwave power setting with a load of 1000?cc of potable water. 2. the water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approxi- mately 190 mm. 3. the oven and the empty vessel are at ambient temperature prior to the start of the test. the initial temperature of the water is 10? ? c (50?.6 ? f) it is measured immediately before the water is added to the vessel. after addition of the water to the vessel, the load is immediately placed on the center of the shelf, which is in the lowest normal position. 4. microwave power is switched on. 5. heating time should be exactly a seconds. (refer to table as following) heating time is measured while the microwave generator is operating at full power. the filament heat-up time for magnetron is not included. 6. the initial and final temperature of water is selected so that the maximum difference between the ambient and final water temperature is 5k. 7. the microwave power output p in watts is calculated from the following formula : it is the heating time. the power measured should be b ( refer to specifications )w?0.0%. p=4187 x caution : 1. water load should be measured exactly to 1 liters. 2. input power voltage should be exactly specified voltage(refer to specifications). 3. ambient temperature should be 20? ? c(68?.6 ? f) heating time for power output: 70 600 64 650 60 700 56 750 52 800 49 850 47 900 44 950 42 1000 40 1050 38 1100 a (second) b (w) measurement and test
25 2. microwave radiation test procedures 1. prepare microwave energy survey meter, 600cc glass beaker, and glass thermometer 100 ? c(212 ? f). 2. pour 275cc?5cc of tap water initially at 20? ? c(68? ? f) in the 600cc glass beaker with an inside diameter of approx. 95mm(3.5in.). 3. place it at the center of the tray and set it in a cavity. 4. close the door and operate the oven. 5. measure the leakage by using microwave energy survey meter with dual ranges, set to 2450mhz. 1) measured radiation leakage must not exceed the value prescribed below. leakage for a fully assembled oven with door normally closed must be less than 4mw/cm 2 . 2) when measuring the leakage, always use the 5cm(2in.) space cone with probe. hold the probe perpendicular to the cabinet and door. place the space cone of the probe on the door, cabinet, door seem, door viewing screen, the exhaust air vents and the suction air vents. 3) measuring should be in a counter-clockwise direction at a rate of 1 in./sec. if the leakage of the cabinet door seem is unknown, move the probe more slowly. 4) when measuring near a corner of the door, keep the probe perpendicular to the areas making sure the probe end at the base of the cone does not get closer than 2 in. from any metal. if it does not, erroneous reading may result. warning : make sure to check the microwave leakage before and after repair of adjustment. always start measuring of an unknown field to assure safety for operating personnel from microwave energy. do not place your hands into any suspected microwave radiation field unless the safe density level is known. care should be taken not to place the eyes in direct line with the source of microwave energy. slowly approach the unit under test until the radiometer reads an appreciable microwave leakage from the unit under the test.
26 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 its power source and discharge the capacitor. 1. high voltage transformer (1) remove connections from the transformer terminals and check continuity. (2) normal readings should be as follows: secondary winding ...................approx. 110 ? ? ? ? ? s resistance will be infinite in one direction and several hundred k ? measurement of the microwave power output . continuity checks can only indicate and open filament or a shorted magnetron. to diagnose for an open filament or a shorted magnetron. (1) isolate magnetron from the circuit by disconnecting the leads. (2) a continuity check across magnetron filament terminals should indicate 0.1 ?
27 wiring diagram
28 1. door assembly refer to disassembly and assembly. 2. control panel assembly refer to disassembly and assembly. 3. total assembly exploded view and parts list
29 no part code part name description q'ty a00 3511723700 door as kog-6c075s 1 3511723710 KOG-6C175S 1 3511723720 kog-6c275s 1 b00 3516730600 control-panel as kog-6c075s 1 3516730610 kog-6c075s12 1 3516730620 KOG-6C175S 1 3516730640 KOG-6C175S12 1 3516730630 kog-6c275s 1 3516730650 kog-6c275s12 1 c00 3513302700 insulator heater as kog-37150s 1 f01 3510805300 cabinet as kor-61150s 1 f02 7112401011 screw tapping t1 trs 4*10 mfzn 3 f03 3516109510 cavity as kog-37150s 1 3516109610 cavity joint as kog-37150s 1 f04 7122401211 screw tapping t2s trs 4x12 mfzn 1 f05 7112401011 screw tapping t1 trs 4*10 mfzn 2 f06 35113a5qj5 cord power as 3x1.5 80x80 120-rtml 1.4m 1 f07 7122401211 screw tapping t2s trs 4x12 mfzn 1 f08 7121300611 screw tapping t2s pan 3x6 mfzn 1 f09 3518904500 thermostat off:100 on:90 hn #187 1 f10 7s627w50x1 nut hex nut flange m5x0.8p mfzn 1 f11 3518606100 noise-filter dwlf-m13 1 f12 7121402511 screw tapping t2s pan 4x25 mfzn 2 f13 3963512310 motor shaded pole 230v 20w mw10ca-m02 1 f14 3512517000 guide wind pp 1 f15 3511800300 fan pp+30%glass 1 f16 3518003700 magnetron 2m218jfl 1 f17 3516004000 special screw t2 bolt flange 5x12 dacro 1 f18 7272400811 screw taptite tt3 trs 4x8 mfzn 1 f19 3513003200 holder hv capacitor secc t0.6 1 f20 3518302200 capacitor hv 2100vac 0.98uf #187 1 f21 3518400400 diode hv hvr-1x-3ab 12kv #187 1 f22 3518701100 fuse hv 5kv 0.55a hv-41a55-02 1 f23 3518113790 trans hv dw-r80s0-63ta 1 f24 3516003700 special screw tt3 hex 4x8 flg mfzn 4 f25 3510311700 base sbhg t0.7 1 f26 7112401011 screw tapping t1 trs 4*10 mfzn 5 f27 3512100900 foot pp dasf-130 2 f28 7272400811 screw taptite tt3 trs 4x8 mfzn 1 f29 3515201101 stopper hinge *u scp-1 t2.5 1 ? caution : in this service 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).
30 no part code part name description q'ty f30 7122401211 screw tapping t2s trs 4x12 mfzn 1 f31 7122401211 screw tapping t2s trs 4x12 mfzn 1 f32 3518570400 switch s/a relay dwsr-1 1 f33 4415a17352 sw micro vp-533a-of spno #187 200g 1 f34 4415a66910 sw micro vp-531a-of/szm-v16-fa-61 1 f35 4415a17352 sw micro vp-533a-of spno #187 200g 1 f36 3513702610 lever lock pom 1 f37 3513811710 lock pom black 1 f38 3513601600 lamp bl 240v 25w t25 c7a h187 1 f39 7112401011 screw tapping t1 trs 4*10 mfzn 1 f40 3966030900 motor syncro 220-240v 50hz tyj50-8a7 1 f41 3518905300 thermostat off:75 on:65 h #187 nb 1 f42 3513003400 holder thermostat pp(natural) 1 f43 7272400811 screw taptite tt3 trs 4x8 mfzn 1 f44 3511405100 cover wave guide mica t0.35 1 f45 3517402130 coupler xarec 1 f46 4078502031 button locking pp honam a353 2 f47 7s627w50x1 nut hex nut flange m5x0.8p mfzn 1 f48 3514700900 roller teflon 3 f49 3512509210 guide roller pp 5113mf6 a 353b 1 f50 3517203610 tray boro-si glass(neg) 1 f51 3517204410 tray rack as kog-361q0s 99mm 1 4 c a u t i o n : i n t h i s s e r v i c e m a n u a l , s o m e p a r t s c a n b e c h a n g e d f o r i m p r o v i n g , t h e i r p e r f o r m a n c e w i t h o u t n o t i c e i n t h e p a r t s l i s t . s o , i f y o u n e e d t h e l a t e s t p a r t s i n f o r m a t i o n , p l e a s e r e f e r t o p p l ( p a r t s p r i c e l i s t ) i n s e r v i c e i n f o r m a t i o n c e n t e r ( h t t p : / / s v c . d w e . c o . k r )
s/m no. : g6c075s003 daewoo electronics corp. 686, ahyeon-dong mapo-gu seoul, korea c.p.o. box 8003 seoul, korea telex: dwelec k28177-8 cable: ?aewooelec printed date: oct. 2003

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